DE2251926A1 - ELECTROPHOTOGRAPHIC COPY DEVICE - Google Patents

Description

The invention relates to an electrophotographic copier.

The application of data processing methods for the storage of business records, shipping lists * files of the Employees and the like in the form of coded data records is in all branches of business and it has become common practice in trade «The information stored in this form can be made using Data processing devices are selectively read out again j

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however, it is often desirable to have the information present on the encoded recordings in the usual form of persistent information Recover documents without further duplication can be used immediately. If the encoded data records are in the form of a data card or the like. to have, which contains both a data field for the coding and an information field in which the document information in a is contained in a form visible to a viewer but not readable by the data processing equipment, it often is required to use the data processing machine first, namely for selective retrieval and afterwards a common copier to copy the receipt information from each rotated data card and so persistent Receive documents that can be used immediately. This kind of selective retrieval of information Multi-step operations are often time consuming, and maintenance requires expensive specialized equipment that is often not is used to its full potential, and is often unable to utilize the recovered information in one appropriate format to be delivered. From this it follows Need for selective printing equipment capable of receiving encoded data records in this format take and immediately print the receipt information contained on each such encoded data record, in compliance with the specified selection conditions and in a wide range of selectivity.

Similar problems arise when you have business records, personnel files, or any other material that is to be selectively printed is stored in coded records of the type mentioned, but the need should a selective printing equipment of the type mentioned above made clear on the basis of the special case of mailing lists to be used to make envelope addressing labels. In a typical case it is the address information for each in the mailing list

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existing individual in the form of a receipt on a coded data record or card and this data _{record or card is encoded with information, which identifies various characteristics; e.g. business names 9} personal data, personal and business records Uedglo, the individual whose address is available on the record "is» i) These data records can be read out in separate groups according to preselected characteristics or individually according to the particularities selected for a special shipment, with the help of known data processing machines, provided that the costs for the necessary data processing equipment are justified by the frequency of their use The rotated cards can then be fed in a pile into an electrophotographic copier which operates to locate information in the pile, such as label printing direction, dia in the US = patent application Serial Hr ·· - ·. (d / 3122) from Xerox Corporation. In the electrophotographic printer described there, several data cards in the form of address cards, microfilms, etc. are used. is input and processed in a continuous manner so that the receipt information from each input data card is successively reproduced on a paper tape. After the end of the run of the rejected data cards, the paper tape can be removed from the electrographic printer and cut or divided along perforation lines, with which one obtains the desired address labels from all rejected cards. where a photosensitive part in the form of a drum is used, around the circumference of which loading, exposure, development, transmission and cleaning stations are arranged so that continuous processing is possible

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Data card is therefore brought into the lighting station Circumferential field of the photosensitive part, the area of which is sufficient in order to record the receipt information on the data card, a standard corona discharge device is used in a charging station sensitized and then with the image template »which represents the document information on the data card, exposed to form a latent electrostatic image. The circumferential field of the light-sensitive part, the carries the latent electrostatic image, then continues to rotate at a constant angular velocity to the development station and meanwhile, an electrostatic latent image of the receipt information becomes the next data card on an adjacent one Formed circumferential field of the light sensitive device part. While it's a latent electrostatic Image containing peripheral fields of the photosensitive device part running through the development station become triboelectric with the conventional cascade development technique charged toner particles cascaded across the photosensitive device part, with charged toner particles in a selective pattern corresponding to the charge pattern generated by the electrostatic latent image on each peripheral field of the photosensitive part. When such an image field on the periphery of the photosensitive device part Has passed the development station, it rotates to the transfer station, where the toner image on a tape or sheet of paper is transferred. At the transfer station, corona discharge technology is used to ensure that the toner images are transferred to the paper tape in high quality, and difficulties that one insufficient charging, sensitivity to moisture and susceptibility to toner clumping if broken of the copy tape, as they occur with other transfer devices, such as transfer rollers, with certainty turned off. It should be pointed out that this device uses the corona discharge technology without

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Apply difficulty IABT ₉ because, after each image formed on the photosensitive Vorriohtungsteil is transmitted, the "transfer member be continuously maintained with the lichtempfindliehen portion in contact krnn and thus eliminated problems as they occur when a charged transfer member engaged with a photosensitive Yorrichtungsteil in contact After the image transfer is complete, the toner image on the paper band is melted to fix it, while the periphery of the photosensitive drum continues to rotate after passing through the transfer station to a normal cleaning station, where the remaining toner is removed so that it is extensively «Part of the photosensitive part can be used again for the formation of the next latent electrostatic image if it is brought back into the charging and exposure station by the rotation of the drum. A continuous electrophotograph is obtained aphisohen copying process

Highly specialized equipment has been proposed, such as the apparatus described in IIS Patent 2,859,673, which appears to be capable of selective printing for specific input and output conditions. The prior art does not disclose selective electrophotographic printing systems which allow the receipt information on encoded data records to be printed out in any conventional format at high speed and high quality while allowing a relatively wide range of selectivity as to the form of the code used "The existing selective printing devices, as far as they are known, are only highly specialized selective printers that are not able to produce flawless toner images on a transfer element because the powerful transfer technology using corona discharge was not considered usable due to Problems with air gap ionization when a charged transfer element with a toner to be transferred «

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image is brought into contact selectively. In order to avoid these difficulties, charging methods are becoming less effective are used, which result in poor quality toner images on the transfer member and relatively long pauses in transfer. In addition, the charging techniques used are highly susceptible to a change in humidity and once a incorrect feed or a break in the transfer element occurs, for example in the EaIl of a transfer roller, removed this the toner directly from the photosensitive device part and is gelatinized with toner. Also turns the selective information in general mechanically with the photosensitive device part, so that only limited Data processing functions are available and therefore the selectivity inherent in a given printing process is strong is restricted and only a limited number of control functions derived from the processed selection information can be <>

The present invention seeks to provide electrophotographic printing systems which can selectively print at high speed allow document information available on coded data records of any format. The selective electrophotographic Printing systems are intended to provide an operator with a wide range of selectivity that is readily available can be enlarged or reduced for a specific need. In these printing systems, at the transmission station can be worked with an ion charge in order to selectively printed out toner images on a transfer element Achieve high quality receipt information. The electrophotographic printing systems should operate so that the selection information logically processed independently of the document information, but passed on in a way is, which is timed to the processing of the document information, so that the logically processed selection information can be used to control the various processing operations of the receipt information. In the

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Printing systems should collect the receipt information from each of a Multiple encoded data records using continuous processed electrophotographic imaging processes but only the receipt information from the selected data records should be transferred to a transmission element be transmitted in a charging transfer station

The invention provides an electrophotographic printing system before, in which a code reader scans a multiplicity of coded data records containing document information and an electrophotographic imaging device processing can be entered, which images the document information on a photosensitive device part, whereupon the Image is treated according to electrophotographic techniques and then fed to a transfer station; the code information of all data records processed in this way} which have been read out by the code reader, will be in accordance with the selection conditions processed for the selective printing and a print and jump information is obtained from it; this episode of print and jump commands is passed through a logic circuit at a speed that is the speed corresponds with which the voucher information of all encoded data records is processed electrophotographically so that every bit of information in the print and jump instruction sequence is present at a specific output of the logic circuit at the time when the receipt information the associated data recording of the transmission station is performed; At this transfer station there is a transfer element, normally from the photosensitive Device part is withdrawn, continuously charged with the aid of an ion discharge device and means are provided around the transfer element from its retracted position into the transfer position on the photosensitive Bring device part when at the output of the logic circuit a bit representing a pressure signal

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present iet «>

Further features, details and advantages of the invention result from the following description of an exemplary embodiment based on the drawings. Show in it:

Pigoi a device for selective printing with associated Components of a selective electrophotographic according to the invention Printing system;

Figo2A-2D an example of a control device of the selective electrophotographic printing system;

3 shows a sampling and selection circuit for the selective electrophotographic printing system;

Pig.4 a logic and control circuit for the selective electrophotographic printing system;

Figo5 is a detailed view of part of the selection mechanism for the transmission element shown in Figure 1 and

6A-6D show the various relationships between the transmission element and to be transferred toner image during a typical transfer operation to that shown in Figure "1 printing system, wherein FIG _o 6A, this relationship shows the selective transfer at the moment of introduction, Figure 6B at the time , when the transfer member is brought into transfer position with the toner image, Fig. 6C at the time when the transfer of the toner image from the photosensitive device part to the transfer member is just finished, and Figo6D at a time when the transfer member after completion of a selective transfer from the light-sensitive part has moved away "

Fig. ₉ shows a selective printing apparatus which constitutes that portion of the embodiment of the invention employing the electrophotographic process originally described in Oarlson U.S. Patent 2,297,691. The Dructe-

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device has a continuously rotating photosensitive Drum 20, along the circumference of a loading station G, an exposure station 0, 'a development st action D, a transfer station E and a cleaning station F are arranged ο

The photosensitive drum 20 is shown in the example as a simple drum with two layers, one Insulator 31 and a conductor 32. Since it is not the subject of the invention, it suffices to mention for understanding that when the selective printing device is operated by conventional electrophotographic processes, the conductor 32 of any suitable conductive material or of a dielectric with a coating of a conductive The insulator 31 can consist of a material exist, which has photoconductive properties, so that the insulator 31 normally insulates and has a special ability to To hold a charge has to be, but becomes selectively conductive through the action of electromagnetic radiation. the Electromagnetic radiation can be applied as a chiaroscuro pattern to the original image to be copied »It can also reflection exposure can be used. The materials used for the insulator 31 can be selected from those used in electrophotographic Procedures commonly used are chosen «,

The charging station G may comprise one or more charging devices of conventional type, which in the known manner, the photosensitive drum 20 by charging the surface of awareness of the insulator to a uniform potential _o example, may be provided in the charging station G, a charging means, as described in US- U.S. Patent 2,888,699 or U.S. Patent 2,836,725 and 2,879,395.

The exposure station 0 on the drum circumference has the conventional one Form of a projection device 33, in which the opti-

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see illustration technique is used to take one at a time Light-and-dark patterns of each data card 1 to map a stack of cards on the surface of the insulator 31. In Pig. 1 is a slit exposure device 34 is shown, but any other optical system including lenses can be used or the like. contains. In the embodiment shown the exposure station O is arranged such that the rotating photosensitive drum 20 first sensitized in the charging station G and then exposed in the station C. will; however, the process steps of charging and exposure can also be carried out simultaneously, for which purpose the spatial arrangement of the exposure station C and / or the charging station G is changed accordingly. Next is in that Example according to FIG. 1 shows only a simplified method with a single charging step and a single exposure step? however, additional Electrophotographic process steps can be used, such as a second charge to form the latent electrostatic Image, or the latent electrostatic image, can be reversed or changed in the same way after formation using additional process steps, as is familiar to the person skilled in the art.

The development station D has a reservoir 35 which is adapted to hold portions of the photosensitive drum 20 with the cascade development process or the like. to be developed in the manner known to the person skilled in the art. The reservoir assembly 35 may be driven by a motor 24 and may be any of the conventional devices generally disclosed in US Pat Electrophotographic development techniques are used to create charged, fine particles, called toner, on the image area to be deposited in the selective pattern of the previously formed electrostatic image.

The transmission station E contains a charging device 30, which serves to place a specific charge on part of a

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■ - - 11 ~

Transfer tape 9 to be applied in close proximity to the photosensitive drum 20 to thereby transfer a toner image from the surface of the photosensitive drum 20 to the transfer tape 9
effect when the latter has applied to the drum.
The transfer strip 9 can be made of a suitable transfer material, such as paper, plastic or other materials used as copying material. The same devices as for the charging station G can be used as the charging device. Any charging device that is in the
Is able to apply a certain level of charge on the surface of the transfer strip 9, can be used for the transfer station E. The charger 30
the Ügo1 is connected to a potential source, for example a conventional direct current source

The cleaning station ¥ can contain a conventional cleaning device, for example in the form of fur brushes, scrapers or cascade cleaning means, which removes the remaining toner from the surface of the photosensitive drum 20 in a known manner. Since the expert is aware of the possibilities for this, it is sufficient to state that the cleaning station 3? operates to remove the residual toner particles from the surface of the photosensitive drum 20, making it ready for reuse

The remaining components of the selective printing device der]? igo1 are given below in the context of a general Description of the puncture of the device explained.

Several data cards, some of which are to be selectively printed, are stacked on a feed tray 2 and from there individually one after the other with the aid of a guide roller 6
through a scanning station B and a projection system 33
a stacking tray 49 conveyed. Coaxial on the drive

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shaft 5 of the infeed roller 6 and two laterally offset collars 10 and 10 '(attached. Each collar 10 and 10 * has an adjusting screw 19 or 19''so that it can be slid sideways on the drive shaft 5 and adjusted around the latter in the direction of rotation Coaxial time disks 4 and 4 'are attached to the collars 10 and 10'. In addition, a collar 11 is attached to the collar 10 and a collar 11 'is attached to the collar 10' or »21 'for lateral adjustment and setting in the direction of rotation on the collars 10 or« 10'. Two same 3 and 3 'are attached to the collars and 11 ". Between the disc combinations 3 and 4 as well as 3' and 4 * there is a light source 7 fixedly mounted on the side remote from the light source 7 side of the disk combination 3 »4, a light-sensitive device is arranged θ;. on the side remote from the light source 7 side of the disc combination 3 * _s 4 ^f is a further photosensitive einr icht 8 '. For each revolution of Sinführrolle 6 in the clockwise direction, the open slanted slot can see Figo2B, light rays from the light source 7 sur photosensitive means 8 fall "at each aolchen revolution of the infeed roller 6 also allows the open slanted slot ö ^f, see Pig.20 that Light from the light source 7 reaches the light-sensitive device 8 '. The light-sensitive device 8 represents part of a clock generator 70 of the logic and control circuit shown in FIG , the duration of which is determined by the deviation between the leading edge of the time disc 3 and the trailing edge of the side disc 4 (360 - θ) when the infeed roller 6 rotates clockwise. The light-sensitive device 8 'represents part of a selective clock generator 98 which will also be described with reference to FIG. 4 and which generates a clock pulse with a duration which is determined by the interval (360 - Θ ¹ )

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istj that is formed by the leading edge of the disk 3 ^ß and the trailing edge of the disk 4 * for each clockwise rotation of the infeed roller 6 ", since the relative positions of the disks 3 and 4" as well as 3 'and 4 ^{6 are} such that the angle θ is smaller than the angle θ% and since the leading edge of the disc 3 of the. leading edge of the disc 3 * by an angle 0 _{S e} see Figure 2D, is advanced, are synchronized with the pulses generated 8 ^f pulses generated from the photosensitive device obviously with the photosensitive device of the 8? however, the former are of shorter duration and lead the ^{pulses generated by the photosensitive device 8 1} by the time required for the disk 6 to traverse an angle of J # °. As will be described with reference to FIG. 4, the excitation of a single-speed clutch 15 is controlled by the leading edge of the clock generator 70 and the selective transmission device 25 is immediately thereafter set in motion by the pulse generated by the clock generator 98, so that the transmission strip 9 on the Speed of the photosensitive drum 20 is brought up before it with the toner image on the drum 20 in the transfer. station E comes into contact «,

On the way of the data card 1 from the Einführwanne 2 to the stack tray 49 of the projection system 33 is arranged a sensing station B at a ¹ in front of the slit exposure device 34th At this station B, the scanning and selection circuit of FIGS. 3 scans the coded information on the data cards 1 and supplies the logic and control circuit of FIG. 4 with print and jump commands in a controlled time sequence which represents the actual speed which the data cards in station B are queried »Here, each such signal is only a pressure signal if certain selected preconditions are met, which are set in the status and selection circuit of Figo3 by the state of the

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-H-

Selection modules are set. These preconditions must be met by the coded information that is derived from the to The data card belonging to this signal is read out, namely by establishing that special coded information is present on the card and possibly that other special encoded information is missing on the card. This The signal is usually generated at the same time as the data card is scanned, to which it relates, derived in the sampling station B and appears at the output of the inverter and buffer stage 69 of Figure 3; However, it is controlled by the logic and control circuit of Figo4 in a controlled time sequence for different uses coordinated control functions of the various elements of the selective printing device of Figo1. The circuit of Fig. 4 receives these signals and shifts they one after the other in their temporal sequence through several stages, so that an immediate correspondence between the The stage to which a given signal has been advanced and the position in which the image is on the photosensitive Drum 20 to which the signal belongs has continued to rotate. The signal (pressure or jump) can be in a certain level that is to be used by the logic circuit connected to this stage, which is at the corresponding position of the associated image to control the functions required.

A card edge detector is used to enable the mode of operation described 50 is provided which generates a pulse when the leading edge of each data card 1 enters the scanning station B comes; In this station there are also several sensing elements 30-5OC, which are set so that they Read out pre-assigned information on each data card when you reach station B. In this context, pay attention It should be noted that the data cards in the illustrated embodiment have a format that is a number of the same Has bit positions that are aligned perpendicular to the direction of travel of the card and are used to the cards with

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Vorzuooäieren a certain code, which relates to the visible document information of the data card ₀ In this way, by selective marking of special bit positions in a known manner, the pre-ooded information can be read out at the scanning station B, while the bit positions of the data card pass the scanning elements 50-500. So that the scanning elements 50A-5OG only perform scanning in station B during the period in which the bit positions of the data card entering station B are located directly on the scanning elements, the scanning and selection circuit of the pig 3 uses the mentioned pulse from the card edge detector to provide a periodic scanning function ^ which is delayed by the same amount of time that each data card needs to get from the point where your hand was perceived to the point where the bit positions on the data card are immediately next to the Sensing elements 5OA - 5OG are «

Various alternative card formats with regard to ordering and selective rearrangement of the spatial position of the scanning elements 50A-50G are known to the person skilled in the art _{or similar} . If the scanning and selection circuit of the Iigo3 is modified in such a way that a single scanning element scans one after the other instead of simultaneous scanning by several scanning elements, then © in the appropriate data card format for the bit positions has a column of bit positions that are aligned in the direction of card advance is _s why a clock track or an external clock generator must be provided _e

In the course of data cards in one! Series of der.Abtast "station B by the projection system 33 for Stapelboöen 49 optical images of document information to pass each data card, the slit exposure device 34 and ziaehein ~ the other with the help of a mirror nnä lens configuration of the projection system 33 to the Surface of the photosensitive drum 20 is projected. Since the drum 20 is with a

rotates constant angular velocity in such a way that its surface moves at the same speed, as the data cards pass through the exposure device 34 are shown on the successive fields of the drum 20 electrostatic latent images of the receipt information of the data cards are formed while the cards are being exposed through the exposure station C run. In addition, since each in station B was scanned Data card needs a certain period of time to get from station B to the slit exposure device 34, and since the various stations on the circumference of the drum 20 have fixed spatial distances from one another and the drum rotates at a constant angular speed, paces the mentioned print or jump signal for each data card goes ahead in time and creates a certain time difference between the formation of the latent electrostatic image associated with the data card and the subsequent process steps, which concern the field on which the image is formed as this field moves through the various peripheral stations D, E, F and G moved »

As will be described in greater detail with reference to the logic and control circuit of FIG. 4, the pressure or jump signals for the scanned cards used by the circuit to provide several logic and control functions, through which an optimally coordinated operation in development station D and transmission station E is achieved » As explained in a simultaneously filed US patent application, these pressure or jump signals can be used for this purpose to achieve further operational advantages with the help of a new type of melting device. Because such Melting device not necessarily part of the invention Device is, but only one convenient embodiment used in the system according to the invention can be »if the toner is to be fixed, be here

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only mentioned in general.

The selective printing devices that form electrostatic latent images for each card scanned, transferring only selected images to animals, have had problems with background toner occupation and excessive use of toner in the development stations. A background coverage with toner often occurs in such printers because the latent electrostatic images formed one after the other on the rotating drum are all developed one after the other in the development station, and then only selected selected ones of the developed images are transferred in the transfer station. Therefore, the cleaning station in such a printer must remove not only the residual toner from the image fields from which the toner was transferred in the transfer station, but also all the toner from the image fields from which no toner was transferred in the transfer station, because a jump command was available for these image fields. Since all cleaning stations while eliminating the entire toner from the continuous frames are not working optimally, the toner collects on the background to the frames that are skipped in some drum turns, gradually _o

To the unnecessary use of toner and the background allocation to keep up with toner as low as possible, the above-mentioned printing or jump signal is used for each data card by the logic and control circuit of FIG _o 4 to control the motor 24 of the developing device before the arrival of an image field, which carries an electrostatic image of a data card with a print command, and to keep it in operation only as long as such an image field, which can be identified with a print signal, is in the chamber of the development station D. The supply switch arrangement '35 thus works intermittently to keep track of the number of latent electrostatic images that are being developed in station D.

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which and whose toner is not subsequently transferred in the transfer state because there is a jump instruction for them to decrease. Since such intermittent operation of the reservoir assembly 35 the development of at least all latent electrostatic images which are thereafter transferred to the station E ensures _f and also reduces the unnecessary developed images, the consumption is reduced to the toner and at the same time the accumulation of toner on the background is reduced thereby increasing print quality and reducing costs.

In order to achieve a selective image transfer in station E in accordance with the print or jump commands of the logic and control circuit of FIG. 4, the selective printing device of FIG Kind of the in U.S. Patent Application No. _oe

(P / 2267) and, as shown in Figo! and 5 can be seen, two parallel T-beams 25a, the horizontal web of which at one end is provided with an anchoring element 25b is connected so that a pivoting movement about a fixed axis 25c is possible, which is parallel to the axis of rotation the drum 20; a shaft 25d extends between the central portions of the T-beams 25a and has one to the drum axis parallel axis; a roller 25e for freely rotatable about a common longitudinal axis with the shaft sits on the shaft 25d the strip; between the ends of the horizontal webs of the T-beams 25a, which are furthest away from the anchorages 25b a stripping rod 25f extends parallel to the axis of rotation of the drum 20; the vertical flanges the T-beams 25a are supported and fixed on a base part 25g; a bistable drive 25h, one end of which attached to the base 25g and the other end thereof is rigidly set, has a normally energized contraction solenoid 27, which the selective transfer me-

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mechanism 25 (and especially the roller 25e for the strip) in a raised position from the surface of the drum 20, as well as an expansion spring 28, which the selective transmission mechanism when the solenoid 27 is de-energized at high speed in an arc up to the drum 20 The drive mechanism for the strip in the present embodiment is in the form of a single-turn clutch 15 "a pin wheel 16 sum strip feed whose intermittent rotation is controlled by the clutch 15" and an alignment roller 17 for the strip 18 ₀ the clutch 15 is of the type that they, when energized by the gate, "a derflanke from the clock 70 derived pulse by a fixed, predetermined amount rotates" Accordingly, it is rotated upon energization of the clutch 15, the pin wheel 16 by a fixed amount and leaves the transfer tape 9 a fixed distance during each individual cycle of the machine of, for example, 352 ms duration. The movement step of the transfer strip 9 is preferably made equal to the size of the developed image to be transferred for each machine cycle.

As can be seen from Figure 1, the strip 9 is guided so that he from a supply roll 13 through the priority escapement 18, around roller 25e, then under stripper bar 25f and through fuser 40 if the toner fuses is to be, then further around the alignment roller 17 and the pin wheel 16 in a receiving trough for the strip «» 'This arrangement normally keeps the strip in a constant state of relatively high tension (e.g. 226 g (8 oz.)) Whether the streak was developing in preparation for transfer or during selective transfer of the Image at station E itself moves or remains stationary during a jump state, and regardless of this,

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whether the transfer strip 9 is before the transfer to the Drum 20 moved towards or after completion of the transfer removed from the drum again

The function of the selective übertragungemechanismue 25 of Figoi is clear from a consideration of the pressure cycle graphs in Figures 6A ~ 6D _o. As already mentioned, "the logic and control circuit of the Pig.4 comprises several stages into which the print or jump signals are shifted in direct accordance with the special spatial positions of the associated images on the drum 20" at the point in time when a developed image »To which a pressure signal is assigned» arrives at the position shown in Fig. 61, the associated pressure signal is switched through to a certain stage, to which a logic circuit is connected which, firstly, causes the one-turn clutch 15 to initiate the clockwise rotation of the pin wheel 16, in order to accelerate the speed of the strip 9 in time to the circumferential speed of the drum 20, and secondly, after a short delay, the selective transmission relay 26 drops so that the contraction solenoid 27 is de-energized. During this de-energization, the expansion spring 28 causes the carrier 25a to pivot upwards, the sleeve 25e and the stripping rod 25f also moving upwards, the latter by a greater distance due to its greater distance from the pivot axis 25c

Since the roller 25e is on the side of the drum 20 close to the pivot axis 25c, and the stripping rod 25f is on the other side of the drum and thus closer to the alignment roller 17, causes the described upward movement that the strip 9 rests against the drum 20 in a contact arc because an adjustable spring stop 28a on the rod 28b allows an entire upward stroke in the expansion spring 28, who brings the roller 25e into a position "that it does

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~ 21 -

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laughing away from the Troiameloberf, the taut over «- support strip 9 over a tangential position to the drum 20 lets go out. With the adjustable Federansehlag 28a an adjustable solenoid stop 27a cooperates, which the Downward movement of an armature 27b of the solenoid 27 is limited · by means of the spring stop 28a and the solenoid stop 27a the movement limit positions of the Rolle.25e can be clearly defined and, if necessary, fine-tuned, "to a controlled to achieve constant contact arc when the transfer tape 9 for printing with the photosensitive Drum 20 is brought into contact, and around the transfer tape 9 during a jump in a specific position to keep close to the drum surface. Because between the roller 25e and the surface of the photosensitive drum there is no contact under any operating conditions, this roll can approach the drum 20 at a very high speed without fear of damage » Since the transfer tape 9 is kept in a high tension state and within a very short period of the lifted position is brought into the contact position with the drum 20, for example in 30 ms over a distance of 3 »2 mm is obtained practically immediately after de-excitation of the solenoid 27 a constant contact arc "

Figure 6B shows the relative position of the developed image to be printed and the moving strip 9 in contact with the surface of the drum 20 in an arc of contact (e.g., about 30 $ of the image to be printed). Since the transfer of the toner takes place practically immediately upon contact of the transfer strip 9 with the drum 20, the toner transfer of these fields within the initially produced contact sheet takes place practically instantaneously. Although the charging device 30 is preferably constantly excited, air gap ionization is avoided

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ORiQiNAl INSPECTED

due to the short time it takes to put on and take off the Transfer strips 9 during selective printing and also by the arrangement of the charger 30 on a A unique point that their effective radiation distribution does not include the entry point of the contact arc. This is described in more detail in the mentioned US patent application ··.

Pig. 6C and 6D show the states when the transmitted image passes through and out of the transmission station E. As can be seen from FIG. 6G, the further transfer of the developed image takes place after the first contact of the strip 9 with the photosensitive drum 20 in a contact arc at the speed of the drum and the strip, because the subsequent surface sections of the transfer strip 9 in Arc contact are brought and the immediate transfer of the toner takes place. Pigo6D illustrates the state when the next image on the drum 20 does not have an associated print signal. As will be described for the logic and control circuit of Mg.4, the contraction solenoid 27 is energized and the strip 9 is brought back into its retracted rest position if the stage of the circuit that precedes the stage mentioned for Pig.öA, no pressure signal which would indicate that the subsequent image on the drum should also be printed. Causes the transition from the pressure prevailing in Figure "6C state to the state of the Pig _e 6D, the energized solenoid 27, that the stripper bar 25f moves downward and to the strip 9 in the vicinity of the beginning of the transferred image, the gewöhnlioh no significant Toner has more and therefore does not run the risk of being smeared, comes into contact. By this movement of the stripping rod 25f in connection with the downward movement of the roller 25e forces are applied at two closely adjacent points on either side of the transfer station E, the electrostatic and other attractive forces between

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the transfer tape 9 and the drum 20 overcome. In cases where there is a risk of the toner smearing, the scraper bar 25f can be replaced by a suction bar that extends just above the surface of the transfer strip extends opposite the surface on which the toner images are formed and which is then in operation, if not to be printed *

In FIG. 3, an example of a scanning and selection circuit is shown schematically, which can be added to the selective printing device of FIG. Figure <> 4 shows an example of a suitable logic and control circuit that may be added assigns the printing device ₀ For the now following description of the Figο3 and 4 is assumed that continuously for all gates, inverters, registers and flip-flops, the TTIr logic used is, while operational amplifiers in the form of conventional integrated circuits serve as amplifiers the use of logic elements readily available on the market and the use of the smallest possible number of components can be optimized. It is also evident to a person skilled in the art that all of the logical components and arrangements described in connection with FIGS differs from that described in connection with Figs. ₀ 3 and 4 as long as the resulting modification is calculated to give the same result or a slightly different result for the same purpose. Even though it was mentioned that TTL logic and integrated circuits as operational amplifiers used throughout in the circuit examples described in FIg ₀ 3 and 4

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individual MSJ switching points or MOS-equipped ones can be used Circuit chips are easily exchanged without thereby deviating from the teaching of the invention would be given.

Defeat and selection circuit

FIG. 3 schematically shows an example of a scanning and selection circuit for the selective printing device illustrated in FIG. 1. To the circuit of Figo3 include a card edge detector 50, the aforementioned scanning e 5oA-5oC, a plurality of associated data channels AC, a plurality of pressure-selection modules 1 ~ 3 _f a decoder, which is formed of gates 51 and 52 and controlled output means -53 · In In accordance with the description of the selective printer, it is also assumed here that the unprocessed data which contain the document information to be selectively printed have the form of individual data cards which carry a series of 12 bit positions for the visible document information Bit position is coded according to a certain Oode, applied to the document information contained in a given stack of such data cards. It is further assumed that the selection is made by scanning the marked or unmarked information in certain three of the twelve bit positions; however, a different number of bit positions can be sampled simultaneously, depending on the desired degree of selectivity, by providing more or fewer sampling elements 50A-50C with associated data channels AC or by repositioning one or more such sampling elements over another bit position. This is readily apparent to a person skilled in the art from the symmetry of the circuit shown in FIG.

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~ 25 «

The card edge detector 50 and all of the control elements 50A-50C may take the form of individual light-sensitive devices, such as phototransistors, photodiodes or the like, which, as FIG. 3FIg * 1 shows, are arranged at suitable locations in order to detect the information. The card edge detector 50 is in the position shown in I ⁵ Ig ₀ 1 Location of the leading edge jeäer Batenburg "card determines if this is transported by the Einführwanne 2 to the scanning station B, due to the coverage of rays through the card edge. Since the detector 50 only needs to detect the presence of an edge of a data card, a capacitive or mechanical detector can also be used instead of the illustrated light-sensitive device. The scanning elements 5-OA-5OC are arranged opposite the bit positions to be scanned on a card that has arrived in the scanning station B and each generate a signal for marking or non-marking of the bit position checked due to the difference in radiation intensity _? which is received by the light-sensitive device in the event of marking or non-marking. The card edge detector 50 and each scanning element 50A-5OC contain preamplifier stages, such as conventional transistor amplifiers or operational amplifiers, so that the signals generated, which in the case of phototransistors are negative impulses for a marking, are amplified to the selected logic level, before they are applied to the other circuit parts of the]? igo3 ,, For (^ noise suppression and avoidance of interfering signals at the output, suitable noise barriers, such as direct current shunts to earth, are preferably provided »

The output of the card edge detector 50 is with the clock 54 for the interrogation window that is for each from the card edge detector 50 received input pulse one pulse is sufficient Duration, about 25 ms, produced a delay of about 120 ms, which is equal to the length of time it takes for A data card or the like. The leading hand of the

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Detector 50 was sensed required to reach the scanning point under the scanning elements 5OA-5OC, then can the scanning and data evaluation take place. The interrogator clock 54 may be in the form of a conventional one monostable multivibrator with a duty cycle equal to the desired pulse duration, in this case! 'every 25 ms, have, which is arranged in a known manner to be triggered by a conventional delay circuit that is im present Pail would have to provide a delay equal to 120 ms. It is useful to set the clock 54 for the query window to be trained so that it shields interfering signals due to the perception of the rear edge of the card. You can do this through it achieve that the trigger pulses for the monostable multivibrator by a second monostable multivibrator whose duty cycle is equal to the desired delay and thereby a pulse of suitable duration generated whose trailing edge is used to trigger the monostable multivibrator with a duty cycle of 25 ms. The exit of the interrogation window clock 54 is over a line 55 connected to the flip-flop 56, a control input for the circuit shown in Figure 4 and to each data channel A-O, where he opens and closes the query window with the appropriate timing, so that only the information is queried and is used. The length of time during which the query window is open is made so long that the data can be read even if the data card or the marking information on the card is crooked within acceptable limits. The flip-flop 56 can take the form of a conventional monostable multivibrator which is triggered by the trailing edge of the pulse supplied by the clock generator 54 and a matching one Duty cycle has to generate a pulse of suitable duration, approximately 1.5 ms, which is sent as a control signal to the controlled Output means 53 is applied. The output of the flip-flop 56 is connected to a control input of the output means 53 connected and is also applied to line 55 to

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the length of time during which the interrogation window of the data channels A-C is open, by 1.5 ms. Instead of the monostable Flip-flops 56 can have other masking arrangements can be used that give the same result

The output of the individual scanning elements 50A-50C is connected to the associated data channel AC. "Since the data channels are all the same, only data channel A is shown in detail} the data channels B and C have the same structural elements ₉ as in]? Ig _o 3 are indicated by corresponding blocks. As Pigo3 shows, the data channel A has a threshold amplifier 57, an inverter 58, a flip-flop 59 and an inverter and buffer stage, which is indicated by the block 60. All of these elements shown in the data channel A, as indicated by the dashed block, can comprise customary integrated circuits as operational amplifiers and standard TTL components, which are available from semiconductor factories such as Texa3 Instruments Corporation or Pairchild Electronics. The threshold amplifier 57 is connected at its inverting input to the output of the sampling element 50A; its threshold value is set at its input connected to a potentiometer 61. The threshold amplifier 57 works in a known manner by distinguishing between negative input pulses _s which exceed the set threshold value and those which do not exceed this threshold value ^ whereby only the threshold value exceeding negative going impulses are reversed and applied to the output of the amplifier. The threshold value of the amplifier 57 is set to a level such that only those negative-going impulses which represent genuine marking information reach the amplifier output with certainty; in this way it provides a noise blanking

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Noise suppression circuitry as known to those skilled in the art can be achieved. A positive-going pulse at the output of the threshold amplifier 57 is therefore an indication that marking information is present, whereas the absence of a pulse at the output of the threshold amplifier 57 indicates that no marking information is present and therefore, if a bit position is being scanned, that this is not marked. The output of the threshold amplifier 57 is connected to the input of the inverter 58, which can take the form of a conventional TTL inverter. The output of the inverter 58 is connected to the input of the flip-flop 59. The flip-flop 59 is of the usual type, but its free input is connected to the output of the inverter 58, while its set input receives control pulses from the clock generator 54 for the query window via the line 55. Because of this circuit, the flip-flop 59 is normally held in the reset state and can therefore not be set by a negative-going pulse from the inverter 58 unless a control pulse is present on the line 55. When the control pulse terminates on line 55, the flip-flop 59 returns to the reset state and remains in this state until the next control pulse arrives, even if fault inputs from the inverter 58 arrive _e Regarding this control associated with the function of the clock 54, thus it can be seen that the flip-flop 59 actually acts as an interrogation window, the marking or non-marking information can only be stored therein when the clock 54 indicates by the generation of an appropriate control pulse that a data card is in the scanning position. The output of the flip-flop 591 in which a positive or high level represents a mark, whereas earth or a low level indicates a non-mark, is applied to an inverter and buffer stage 60. The inverter and buffer stage 60 can take the form of a conventional TTL inverter which has a low output resistance and the outputs supplied to it

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of the flip-flop 59 is reversed so that a low level is a marking and a high level is a non-marking in its output in the queried bit position, while the low output resistance provides security against noise in the line offers. As described, in each data channel A-C made several inversions of the signal} but this is mainly a function of the logic used Switching arrangements and can easily be avoided, if you use other components and / or logic circuits, for example by using the flip-flop for the marking derives a low output level.

The output of the data channels A-O is with the selection modules 1-3 connected in the manner shown in Figure 3. Since the UHD selection modules 1 and 2 agree in everything, while the OR selection module 3 differs from the AND selection modules 1 and 2 only by substituting an FAO gate instead of the single NOR gate used therein and one differs slightly other data-free state, only the AND selection module 1 is shown in detail in Figo3, while the ^ AND selection module 2 and the ODBR selection module 3 are indicated schematically by blocks. The selection modules 2 and 3 have the same form and practice the same Function like the AND selection module 1, with the exception of the areas specifically mentioned below c

The AND selection module 1 has a three-way switch S ₁ ^, S _1B and S ₁₀ for each data channel AC, as well as a NOR gate 61 and a selector switch S _M1 for the operating mode. Each of the three-way switches S ^ ^ » S - \ - q ^and S ^ ₀ can have the form of a mechanical switch, as shown, and is used to select whether marking or non-marking information is to be determined from the assigned channels AC, or an indifferent state can be selected by bringing the switch into the exhibition. The top contact of the three-way switch, which is labeled MARK

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is used when data cards are to be selected which have a marking in the corresponding queried bit position; it is directly connected to the output of the inverter and buffer stage 60 of the associated data channels, as shown in FIG. So if a marking condition is encountered during the scan, a low level output is present at the MARK switch contacts of the three-way switch S ₁ ^ -S ₁₀ , while the detection of a non-marking is indicated by a high output level is used when the marking or unmarking state of the particular bit position scanned is unimportant for the selection sequence being carried out. The off contact of the three-way switches S-., S _1B and S ₁₀ is connected to earth G via a conductor and is therefore kept at a low level, regardless of whether a marker is detected or not. The lower contact of the three-way switch, which is labeled NO MARK, is used when a state is to be selected in which the scanned bit position does not contain any marking. This contact of the three-way switch is in each case connected to the output of the associated data channel AC via an inverting circuit 63A-63C, which can have the form of the inverter 58. Is in the switch position to NO MARK a marking condition is indicated by a high output level, the selected non-mark while by a low output level in "In all Dreiwegschaltern S. _{1-S 10} will be so once the selected state is found in the sampled bit position of the data card , a low output level from the set switch contact applied to the switch arm of the switch; on the other hand, if an unselected condition is sensed, the switch arm receives a high output level from the selected contact

The switch arm contacts of the three-way switches are each over one of lines 64A-64C is connected to NOR gate 61.

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The NOR gate 61 can take the form of a conventional TTI NOR-Sohaltung; however, due to the prevailing input conditions, the NOR gate 61 functions in the same way as an inverting AND gate. So if all inputs from the three-way switches S ^. - S ^ _{0 are} low, indicating that the selected input conditions are met by the bit positions of the scanned data card, the TJND input conditions for 'NOR gate 61 are met and the output of the gate is high. However, if one or more of the inputs from the three-way switches are high, indicating that the selected input conditions are not satisfied by the bit positions of the scanned data card, the AND input conditions for NOR gate 61 are not satisfied and the output of the gate is low. At this point in the description of FIG. 3 it should be mentioned that an additional bit position selectivity is readily available and can be achieved by simply adding further scanning elements 5OD-Z, and the associated data channels DZ and associated inverter circuits 63D-63Z »three-way switch ·· ter SJ ₁₁ -SJ η, and inputs 64D-64Z for the NOR gate 61 provides O '

The output of the NOR gate 61 is applied via a conductor 65 to terminals a and d of the selector switch S ^ - for the operating mode. The operating mode selector switch S _M - can take the form of a conventional two-pole three-way switch, such as a disc switch or the like, in which the contact arms are mechanically connected for common rotation o The upper and lower contacts a and d of the operating mode selector switch Sjyj ^ are, as already mentioned, connected to the output of the NOR gate 61, while the two middle contacts b and c are grounded, as Figo 3 shows _o The selector switch S ^ is used in such a way that the operating mode of the selective ■ the printing device is selected with respect to the data cards that meet the AND data requirements set by the three-way switch S ₁ ^ -S ₁₀ ; in detail serves the

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- 52 -

Operating mode selection he switches S «^ to cause the printing of the receipt information on the data cards, which the AND data requests of the switch position S _1; Fulfill.-S _1C if it is set to the SELECTION position (SEIECT) in which contacts a and b are used. On the other hand, the selector switch in its position on the SIRtING position (SKIP), in which the contacts c and d are used, causes the receipt information on the data cards which the three-way switches S4a-S | _C meet the AND data requirements set, not printed, ie skipped. If the operating mode selector switch S _{M1 is set} to the OFF position (OPF) in which the contacts b and c are used, the ÜND selection module 1 is made ineffective, so that any data conditions that may be set by the three-way switch S ^ .- S ^ _{0 are} set, do not affect the printing or photographic printing of the receipt information on a specific data card.

The upper switch arm contact of the operating mode selector switch Sjjjj is connected to the conductor labeled SELECT 1, which indicates that the logic level on this conductor corresponds to the selection or pressure information from the AND selection module 1; the lower Söhaltarmkontakt is connected to the conductor designated as SKIP 1, which indicates that the logic level on this conductor belongs to the jump or no pressure information. The manner in which the logic levels on the SELECiD 1-3 and SKIP 1-3 conductors are used to control the operation of the selective printing device according to the invention is explained below. It should only be mentioned here that if the AND data conditions, which are set by the three-way switches S ^ .- S | _{G are} set, are present on the card just queried, a high level is present at the output of the NOR gate 61, but if these data conditions are not present, a low level is present at the output of the NOR gate 61. So if the operating mode selector switch is in the SELECT position and connects a and b, the conductor has

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SKIP 1 always has a low level because contact b is grounded, while the line SELECT 1 can have a high or low logic level, depending on whether the data card being queried meets the IJND data conditions set by the three-way switch S ^ -S ^ q fulfilled or not "If, on the other hand, the operating mode selector switch S ^ is in the SKIP position and connects c and d, the conductor SELECT 1 always has a low level because the contact c is grounded, whereas the conductor SKIP 1 has a high or low logic level can, depending on whether the currently scanned data card fulfills the AND data conditions set _{by the three-way switch S -.- S ^ 0 or not.} When the operating mode selector switch Sjyr. «Is in the OFF position, both conductors SELECT 1 and SKIP 1 are in a low logic state due to the grounding of contacts b and c. The AND selection module 1 thus ensures the selection of the data cards via the markings or non-markings, which all have three specific bit position criteria, while the operating mode selector switch S ^ allows the operator to determine whether the data cards selected in this way should be printed or skipped.

The AND selection module 2 is, as already mentioned, identical to the TJND selection module 1 and thus enables a second selection of data cards that are coded with markings or non-markings, depending on whether they meet a second group of up to three bit position criteria , while the associated operating mode selector switch S ^ ₂ (not shown) allows the operator to determine whether this second data card group should be printed or skipped. The OR selection module 3 differs from the AND selection module 1 in that the ATJS position of all three-way switches ^S 3A ~ ^S 3C is ^not grounded, but is set to a high level and the NOR gate 61 is replaced by a NAND gate, all connections to this NAND gate being the same as those described for NOR gate 61.

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The NAND gate does not work as an inverting AND gate, as is obvious to a person skilled in the art, but as an inverting OR gate and therefore supplies a high output level as soon as one of the special bit states that is shown on the three-way switches ^S 3a ~ ^S 3c (is ^not shown ) are set, while it only provides a low output level if none of the special bit states are present on the data card. The OFF position of the three-way switches S, - S, _n is tied to a high level so that no selection takes place if an indifferent state is indicated in the absence of at least one of the special criteria. The OR selection module 3 thus takes into account a third selection of data cards encoded with markings and non-markings, which have any one of a group of up to three specified bit position criteria, while the associated operating mode selector switch S «* * (not shown) allows the operator to do so to determine whether to print or skip the third group of data cards selected in this way. In Figure 3 three selection modules 1-3 are shown; however, it will be apparent to those skilled in the art that a greater or lesser number of selection modules can be used to provide the necessary selectivity for a particular application. For this purpose, AND and / or OR selection modules only need to be added to the selection modules connected in cascade in FIG. 3 or removed from the latter ₀

The conductors SELECT 1-3 of the selection modules 1-3 are connected to one of the logical inputs of the NOR gate 51, the conductors SKIP 1-3 are each at one of the logical inputs of the NOR gate 52 “Another input of the NOR gate 51 is connected to ground and the output of NOR gate 51 is at the input of NOR gate 52 “The NOR gates 51 and 52 can have the same shape as NOR gate 61; however, the input conditions of NOR gates 51 and 52 are such Kind that the NOR gate 51 as an inverting OR

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Gate works and the NOR gate'52 as an inverting AND gate. The NOR gates 51 and 52 "form a decoder circuit for the various selection and jump inputs of the Selektionsinoduln 1-3, which work in such a way that a jump input the priority, feat, and thus the receipt information from a queried data card that; a jump output is generated at one of the selection modules 1-3, and. from another selection module 1-3 a selection output »is not printed». The NOR gate 51 works: as mentioned, as an inverting ODIR gate, so if any of its inputs is at a high level, which represents a selection condition, the NOR gate generates Gate 51 has a low level output which now represents a selection level; a high output at NOR gate 51, representing the absence of a selection condition, is only generated when all inputs are low. The NOR gate 52 works as an inverting AND gate, so it only generates a high output level representing a selection or printing condition when all of its inputs are low _or when only one of the inputs to the NOR gate 52 is high , its output is low, indicating a non-printing or saving condition * It should be remembered that a jump condition on the SKIP 1-3 lines is indicated by a high level, a non-jump condition on the same ladder is indicated by a high level low and that NOR gate 51 only provides a low output on conductor 66 when it. at least one high or select input is input * All inputs to NOR gate 52 are low and thus provide a high select signal when at least one select level is applied to NOR gate 51 and there is a non-jump level on conductors SKIP 1-3. Under all other conditions of the NOR gate is der.Ausgang 52.niedirig'und thus indicates a jump _condition; so. to provide a priority for jump signals that are sent to äeexi Iieitem. SKIP 1-3 lie. The input to NOR gate 6 * 7 is a forced high input that is used when all data cards are queried

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should be printed and act when the "PRINT ALL ¹¹ key (not shown) is depressed to force the output of NOR gate 52 high regardless of any other inputs to that gate.

The output of the NOR gate 52 is via the conductor 68 with connected to one input of the AND gate 53, which can take the form of a conventional AND circuit, which only then has a high Output level generated when both inputs are high. Of the The second or control input to the AND gate 53 is connected to the flip-flop 56, which, as already mentioned, a 1.5 ms pulse at the end of the window pulse generated »The output of the AND gate 53 is through the inverter and buffer stage 69, which can have the same form as the inverter and buffer stage 60, with the logic and control circuit shown in FIG connected

To describe the operation of the scanning and selection circuit in FIG. 3, it is assumed that the receipt information is to be printed from all data cards of a particular stack which have the data combination 010 in the three bit positions of the data cards belonging to the stack, and also the receipt information from all of them Data cards that have a one (1) in the first or third bit position, with the exception of those with the combination Ul, where the marking information should be marked with a one (1) and the non-marking information should be marked with a zero (0) and the data channels AC as the first, second and third bit positions are considered. For this particular example, consider. Selection conditions are the three-way switches S-. and S _1ß in the AND selection module 1 is set to NO MARK (non _{-marking), while S 1B is set} to the MARK-Pcsition (marking) and the operating mode _{selector switch S M} -j is set to the SELEGT position, thus ensuring that the Data cards are printed on which the data combination 010 appears in the scanned bit positions. Accordingly, the three

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travel switch S ,. and S ₅₀ in the OR selection module 3 to be set to MARK position, while the three-way switch Sza to OFF, deh. must be in the indifferent position and the operating mode selector switch S _{M5 is set} to the SELECT position. This achieves selection levels of all scanned data cards that have a one (l) in the first or third bit position. The rule, do not print 111 for the general OR state is fulfilled by bringing all three-way switches S ₂ AS ₂₀ in the AND selection module 2 to their MARK position, while the operating mode selector switch Sjyj _{2 is set} to SKIP, ie jump position . This ensures a non-printing level when the exception condition is discovered. The data cards of the selected batch can then be filled into the insertion tray and the start button can be pressed to initiate the selective printing process.

When the sampling and selection circuit of Fig. 3 is in operation, the leading edge of each is brought into the scanning station B. Card detected by the card edge detector 50 and after a sufficient delay period to place the data of the inserted data card among the sensing elements To bring 5OA-5OC into position, the clock 54 sets for the Query window a pulse of sufficient duration to the flip-flop 59 of each data channel A-G to open the query window and keep it open until the bit position data is sampled and processed are »Typical values for the delay between the perception of the leading edge of the data card and the generation of the interrogation window pulse can be "about 120 ms, while the duration of the interrogation window pulse applied to conductor 55 has a value of 25, for example me can have. If the query window by applying the clock pulse on the conductor 55 to the set input of the flip-flop 59 of each data channel is opened, the flip-flops are released from their forced reset state, so that their lo-

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which state can be set. Located at this point the perceived data card is in the scanning station and therefore the output states of the scanning elements 50A-50C identify the marking or non-marking state of the certain bit positions on the scanned data card · After threshold weeding and reversing by the threshold amplifier 57 and the inverter 58 become the output of each sampling element 50A-5OG as a set input to the flip-flops 59 is applied such that a negative going pulse indicating a marker will raise each flip-flop 59 to its high Level sets, while the absence of such a pulse sets the flip-flop 59 in the reset state, i.e. on low output holds. The output level of the flip-flops 59 in each data channel A-C is inverted by the inverter and buffer stage 60 and buffered and applied to all selection modules 1-3. Each flip-flop 59 thus acts as a result of the clock pulses applied to it for the query window as a proper timed masking device that only allows data to be in they are fed in when bit information is certain is scanned, but allows this bit information to be skewed within reasonable limits. '

The output of data channel A is directly connected to the MARK contacts of the three-way switches S -.- S ,. and also vice versa at the inverter 63A and to the NO-MARK contacts of the switches ^ 1A "" ^ 3A ^to ß ^e l ^e ß "k · Similarly, the output of the data channels B and C is connected to the corresponding contacts of the three-way switch SjgS-ija and SQS-jQ as described above for the switch S ₁ aS *. The operation of the selection modules 1-3 and the decoder formed by the NOR gates 51 and 52 is explained for the data conditions assumed above is scanned under the control of the clock 54 through the query window, the read bit table information is compared with the conditions set in the selection modules 1-3 and then from the NOl-

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Gates 51 and 52 decoded so that either a selection or print signal with a high level or a jump or non-print signal with a low level occurs at the output of the NOR gate 52 for each queried data card. These print and jump signals at the output of the NOR gate 52, which appear one after the other, are applied to the AND gate 53 via the conductor 68 and switched through as a result of the action of the flip-flop 56, so that for each scanned card either a print or a Jump signal is applied to the circuit shown in Pig. 4, in the correct time sequence, which represents the actual speed with which the data cards are queried at the scanning station B _e

Under the conditions of the above-mentioned specific example, as soon as a data card with the data combination is read, an output level high-low-high appears at the outputs of the data channels AC due to the inversion carried out by the buffer and inverter stage 60. Since the three-way switches S _1A ~ S _1C in the AND selection module 1 are set to NO-MAEK or MARK or NO-MARK, all inputs to NOR gate 61 on conductors 64A-640 are low due to the action of the inverters 63A and 630, and thus meet the AND condition at the input of this gate. Therefore, since the mode selector switch Sj _- J ₁ J is selected, there will be a high output on the SELECT 1 wire and a low output on the SKIP 1 wire. In the AND selection module 2, all three-way switches S ₂ A-Sp _{0 are set} to their marking state in order to look for a 111 state, and therefore an input level high-low is applied to the inputs of the NOR gate 61 in the AND selection module 2. high applied. Since the AND conditions of the NOR gate .61. are not met in the AND selection module 2, the outputs on both the SELECT 2 and SKIP 2 conductors are low. Correspondingly, the three-way switches Sp, and S ₂ Q are set to MARK in the OR selection module 2, while the switch S _{2B is} in its OFF position, that is to say in the indifferent position, which is what is

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Pall of the OR selection module β 2 is a high level in order to prevent NAND gate 61 from generating a high level when set to this position alone. So there is none of the OR conditions of the NAND gate 61 "in the OR selection module 3 is fulfilled because only inputs with a high level are connected to it, the outputs are on the SELECT 3 conductors and SKIP 3 low. So if a 010 state is scanned with the switch positions described, the conductor has SELECT 1 goes high while the SELECT 2 and and SKIP 1-3 conductors are held low. That NOR gate 51 operates as an inverting OR gate, as noted, and therefore provides a low output on conductor 66. Since there is a low level on conductor 66 and also on all conductors SKIP 1-3, the AND conditions for the NOR gate 52 are met, thus the output of NOR gate 52 goes high and a pressure signal for the sensed condition is generated.

As soon as a data card with a one (1) or a mark in the first and / or third bit position is found, is one of the outputs at the outputs of the data channels A-C as a result of the inversion performed by the buffer and inverter stage 60 the following conditions exist:

1
2
3
4th
5
6 low low low

For each of these states, the output from AND-SeI ection module 1 on both conductors SELECT1 and SKIP1 is low because the operating mode selector switch S _{M1 is set} to SELECT and thus conductor SKIP 1 is grounded while the 010 (NO MARK -

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A. B. C. high high low high low low low high high low high low low low high

MARK-NO MARK) setting of the three-way switch S ₁ ^ -S _1c does not meet the AND input conditions of the NOR gate 61 for any of the data combinations listed in the table. According to the table except the last, the output from the AND selection module 2 to two conductors SELECT 2 and SKIP 2 is for all input conditions low because the operating mode selector switch S "2 ^au ^ jump is made, and is thus grounded the head SELECT 2 , whereas the 111 (MARK-MARKMARK) setting of the three-way switch S ₂ A-Sg ₀ only fulfills the AND input condition for the NOR gate if the last data combination in the table is detected. For the data combinations 1-5 in the table, both conductors SELECT 2 and SKIP 2 remain at a low level, whereas in the case of the last data combination in the table, conductor SELECT 2 is low and conductor SKIP 2 goes high.

The three-way switches S ^ .- S, q in the OR selection module 3 are, as already mentioned, set to MARK-AUS-IiARK, so that every low level at the MARK input of the three-way switch · S *. or Sw meets the OR condition of NAND gate 61 and generates a high level at the output. Since the operating mode selector switch Sm, is set to selection, the receipt of one of the input conditions compiled in the table causes a high level on the SELECT 3 conductor and a low level on the SKIP 3 conductor, since this conductor is grounded. For each of the input conditions 1 through 5 of the table, the SELECT 3 ladder is high, while the SELECT 1 and 2 and SKIP 1-3 ladder are low. This satisfies the OR conditions of NOR gate 51 which applies a low level to conductor 66 so that all low inputs are applied to NOR gate 52, resulting in a high level being generated at its output, the selection corresponds, leads. However, if the input condition listed in the table under 6 is detected, a high level is present on both conductors SKIP 2 and SELECT 3, while all

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the remaining conductors are low. The high level on the line SELECT 3 fulfills the OR conditions of the NOR gate 51, ao that on the line 66 a low level present iat. The high level on the conductor SKIP 2 runs contrary to the AND condition for the NOR gate 52, see above that there is a low level on conductor 68 which is selectively switched by AND gate 53. One sees So that the exemplary printing conditions set out above by the described settings for the Selek ~ tion modules 1-3 are satisfied and selection or pressure signals resulting in the logic and control circuit of the Pigο4 are switched through when the desired conditions are determined while jump signals are forwarded, if data cards are thrown off »which do not meet the specified conditions.

Logic and control circuit

Fig. 4 schematically illustrates an embodiment of a logic and control circuit for the selective printing device according to the invention. For the purpose of the description of this circuit, it is assumed that, unless otherwise stated, conventional TTL circuits are used throughout. The logic and control circuit of Figure 4 includes a system clock 70, a signal generator 71 for the start and stop signal, an OR gate 72, a flip-flop buffer stage 73 _for a shift register 74, a logic controller 75 for the development lungsmotor, a logic controller 76 for the one-turn clutch, a logic controller 77 for the relay decoupler 101 of the selective transmission mechanism and a counter 78 for controlling the relay 104 for the start-stop signal generator. The system clock 70 may take the form of a radiation actuated clocking device that provides a pulse of a specified duration at the time a data card is advanced from the insertion tray to the scan or exposure station. The system clock can be on

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work different ways? In the present example, a light-sensitive input is derived from the time slices 3 and 4, which sit on the drive shaft 5 of the infeed roller 6, see FIG. For this purpose, as shown in FIG. 1, a light source 7 is attached to one side of the time slices 3 and 4 and a light-sensitive device 8, for example a phototransistor, a photodiode Oodgle on the other side 6 a radiation when the trailing edge of the pane 4 passes the photosensitive device 8, and this radiation input remains until the leading edge of the pane 3 again covers the rays coming from the light source 7 accordingly the photosensitive device 8 generates in a known manner a negative going pulse for each revolution of the feed roller 6, regardless of whether a data card is fed or not. This pulse has a duration which is determined by the offset Q between the trailing edge of the second time slice 4 and the leading edge of the first time slice 3. In contrast, the photosensitive device 8 has a high output during the entire time interval (360 - Θ) in which it is covered by the leading edge of the first time slice 3 until it is released again by the trailing edge of the second time slice 4, and this interval (360 ° - Q) is used to determine the duration of the clock pulses supplied by the system clock generator 70. A dark edge triggering is therefore used to have the system clock generator 70 driven by the light-sensitive device 8, the temporal appearance of the leading edge of the clock pulse generated being determined by the position of the leading edge of the first time slice 3 on the shaft 5 while the duration of the clock pulse, which is given by the temporal appearance of the trailing edge of the clock pulse, depends on the position of the trailing edge of the text disk 4. So if one assumes for the system according to the invention according to the example described,

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that about three data cards are entered per second, then the infeed roller 6 will perform a full revolution every 332 ms and thus cause the photosensitive device 8 to provide a pulse for each revolution and thus a duty cycle for the machine of 332 ms. The system clock generator 70 can then have the form of a Schmitt trigger, a flip-flop or some other known square-wave converter, which follows the output of the light-sensitive device 8 in a known manner and is therefore reset by the positive trailing edge of this pulse. For a machine cycle duration of 332 ms, a clock pulse of about 230 ms is suitable. Therefore, the offset θ between the time slices 3 and 4 can be selected so that clock pulses with a pulse duration of about 230 ms are generated through the coverage interval (360 - Θ) ₀ In the present case, the clock pulse duration can be set by adjusting the time slices 3 and 4, however, clock pulses of constant duration can be obtained using monostable multivibrators, and in these circumstances the number of time slices can be reduced. Under the above conditions, the system clock generator 70 generates a clock pulse for each revolution of the infeed roller 6, the duration of which is approximately 230 ms and the leading edge of which coincides with the appearance of the leading edge of the first time slice 3 on the infeed roller 6. In addition to the mentioned Schmitt trigger or flip-flop as a clock pulse generator, other masking devices can be used, and if particularly well-defined or pure clock pulses are desired, two Schmitt triggers can be used to provide an additional definition of the input »The output of the system -Taktgebers 70 is applied via a conductor 79 to a reset input to the flip-flop buffer stage 73, a clock input for the shift register 74 and a clock input for the logic control of the single-turn clutch 76 which controls the advance of the transmission strip 9

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• - 45 -

The signal generator 71 for the start-stop signal has a relay on, which is operated when the selective printing device according to the invention operates, and when it falls, the Printing device stopped This relay is activated by pressing a start button for the device If it is de-energized, it will be clear later on the basis of the description of the counter 78. Here only this much: Whenever the relay in the signal generator is de-energized, a low logic level is present at its output, which is the shift register 74 clears for the next * pass and inputs a low or pressure signal to OR gate 72, so that a blank strip is printed between the selective print runs of the device according to the invention Start-stop signal generator 71 is via a line 80 to a Clear input of shift register 74 and applied to a data input of OR gate 72.

The OR gate 72 represents a common OR logic element, which works in a known way and generates a certain output level as soon as a certain input level is applied to one its entrances lies. As already mentioned, one input of the OR gate 72 is connected to the output of the start / stop signal generator 71 connected, while a second gate input at the output of the buffer and inverter stage 69 of the circuit shown in FIG Sampling and selection circuit is and accordingly a sequence of switched through selection and / or jump signals receives, · according to the print and non-print sequence of the queried Data stack. A low input to OR gate 72 represents a select or print command, whereas a high level means a jump or no print command However, the first input to the OR gate is purely for each pass 72 a low level from the start / stop signal generator 71, so that a blank printout on the strip initiates the printing sequence. The other inputs of the cycle come from the inverter and buffer stage 69 of Pig «3 and agree with the pressure and non-printing sequence for the scanned stack of data cards

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match. The output of the OR gate 72 is with the input the plip-flop buffer stage 73 connected. The flip-flop buffer stage 73 is a common plip-flop that uses hi ei * to do this any selection or non-selection signal applied to the OR gate 72 to store briefly in order to then input it to the shift register 74. The input of the flip-flop buffer stage

73 from OR gate 72 is at the set input of this stage, while the D input of the plip-flop is grounded. A voting entrance or low level of the OR gate 72 thus sets the flip-flop buffer stage 73 in a high state and the flip-flop is generated by the system clock when a clock pulse is applied 70 automatically reset to its low state to The output of the flip-flop 73 is connected to a data input of the shift register 74. The shift register

74 may consist of a conventional sixteen bit shift register that advances the select and skip levels through the system at the rate at which the data cards are scanned and processed. However, since the TTL logic is to be preferred, the 16-bit register is in practice composed of two 8-bit registers which are connected in series in a known manner. In the shift register 74, a high level received from the flip-flop buffer stage 73 represents a selection signal, while a low level represents a jump. The shift register 74 can be classified as a series input and parallel output shift register. In Figure 4, only the outputs 5-12 are indicated as only these outputs are of interest "The clock input of the shift register 74 clock system 70 is connected to, while the reset input is connected to the start-stop signal generator 71 ₀

Between the receipt information of a given card corresponding to the electrophotographic used for the invention Technique of FIG. 1 is treated, and the information read out from the data card, which is a print or Jump signal, which continues through the shift register 74

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is switched, there is such a relationship that when the print or jump signal reaches the output 5 of the shift register 74, the receipt information is mapped on the photosensitive drum. The exposed information, which forms a latent electrostatic image, enters the development station D at the point in time when its associated scanned information has reached stage 6 of shift register 74 but has not yet been switched to stage 7. The image of the receipt information rotates through development station D as the information scanned from the data card is advanced through stages 7-9 and leaves development station D at about the time when the scanned information on the data card has reached stage 10. When the scanned information reaches stage 12 of the shift register, the developed image has reached a point on the circumference of the rotating drum just before the transfer station E. The presence of predetermined bits of the scanned information in certain stages of the shift register 74 can therefore be used to determine the Development motor 24, the one-turn clutch 15 and the selective transmission device 25 to be controlled selectively.

The outputs 5-10 of the shift register 74 are already mentioned in parallel with the logic controller 75 connected to the developing motor 24 in the description of the Mg _e 1, it is expedient, the developing device 13 so operate to · that it is normally out of operation, in order to save toner, etc., and then switch on the development motor 24 shortly before the arrival of an image to be transferred at the development station and leave it in operation until there is no longer any image to be transferred in the development station D. This operation is achieved by means of the logic controller 75, the two NOR gates 81 and 82 comprises, the input conditions, they can work as an inverting OR gate, as was described fig _o 3 already for the NOR gate 51, "The Outputs 5-7

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of the shift register 74 are at the input of the NOR gate 81, while the outputs 8-10 of the shift register are connected to the NOR gate 82 in the same way. The NOR gates generate an output with a low level, whenever a high input level, the selection or pressure information characterized, applied to them; thus an output is always generated by the NOR gate 81 and / or NOR gate 82, when document information with a selection signal is present between the exposure station C and the exit point the development station D is located. The outputs of the NOR gates 81 and 82 are connected to the inputs of an OR gate 83 which may take the same form as OR gate 72 except that its output is capable of a Winding 84 to energize the development motor 24 to drive. So the engine of development station D is normally turned off and the logic controller for the development motor 75 operates to control the development station D starts when a selection signal is present in stage 5 of shift register 74 and keeps it in operation, as long as this or another selection signal is present in stages 5-10 of the shift register 74. In this way the developing motor 24 can normally remain in the idle state, but can be switched on before an image is in the development station enters so that there is sufficient toner flow state ekonunt before the image to be developed reaches the development station D enters, avoiding the operation of development station D being interrupted if a selection signal follows within a 6-bit range «.

The outputs 11 and 12 of the shift register 74 are connected to the logic controller 76 for the one-turn clutch, which initiates a full revolution of the pin wheel 16 for the paper advance in a single machine cycle, so that the paper is brought to the speed of the surface of the photosensitive drum 17 when or before it is in

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following the action of the selective transfer mechanism 25 comes into contact with the drum surface. The logical one Control 76 for the one-turn clutch consists of first and second inverting UHD gates 85 and 86, where the first inverting AND gate 85 controls the intermittent operation of the one-turn clutch, while the second inverting AND gate 86 controls their continuous operation. Both inverting AND gates 85 and 86 can do the Take the form of conventional logic gates that produce an inverted or low output level when on each of them Inputs are high. A first input of the first inverting AND gate 85 is via a conductor 79 is connected to the system clock generator 70, while the second input is connected via a conductor 87 to the output of the stage 12 of the Shift register 74 is placed ο The first input to the second inverting AND gate 86 is' connected via a conductor 88 to the output of stage 12 of shift register 74, while the second input is connected to the output of stage 11 via a conductor 89 Bit in stage 12 of the shift register of document information assigned, which is located shortly before the transmission point, while a bit of level 11 belongs to document information, which of those belonging to stage 12 follows next. That first inverting AND gate 85 thus monitors whether a feed of the transmission strip for a present transmission is required while the second inverting AND gate 86 monitors whether for the next at the transfer point incoming document information should be transmitted or not. Since yes the pulse duration of a Clock pulse from the system clock generator 70 is 230 ms, during a machine cycle and thus the cutting speed of the shift register 74 is 332 ms, the output of the first inverting AND gate 85 goes when a high level in Stage 12 of the shift register 74 is present only for the dwell time of the two inputs to low, the 230 ms

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amounts to. The second inverting AND gate 86, on the other hand, receives both inputs for a period of time corresponding to the machine cycle «. Therefore, if both stages 11 and 12 of the shift register 74 are high, the output of the second inverting AND gate 86 remains low for a period of 532 ms. Accordingly, if both stages 11 and 12 of the shift register 74 are high or contain selection information, the output of the second inverting AND gate 86 is used to activate the single-speed clutch for the paper feed hold until the bit of stage 11 is shifted into stage 12 in order to achieve continuous operation. the Outputs of the first and second inverting AND gates 85 and 86 are connected to the first and second inputs of an OR gate 90 connected OR gate 90 may have the same shape as OR gate 72; it creates a low Output level whenever there is a low signal level at one of its inputs or at both inputs ο The output of the OR gate 90 is connected to an input of an OR gate 91. The OR gate 91 can be the same Have the shape of the OR gate 83 · It acts on a winding 92 for actuating the single-turn clutch 15, which Pin wheel 16 detected for a single revolution and thus the transfer strip 9 to the speed of the drum brings ο A second input to the OR gate 91 is from a Signal generator 93 fed for the strip feed. The signal generator 93 may take the form of a conventional button operated signal generator incorporating OR gate 91 with a low input level is supplied when an operator presses the switch button and thus includes the signal generator. The purpose of the signal generator 93 for the advancement of the transfer strip is to drive the transfer strip 9 off the machine after the last data card has been read and when no more cards are inserted will. The OR gate 91 responds to a low signal level from the signal generator 93 and acts on the winding 92 in the same way as it does for a low one

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Input level from OR gate 90 does «,

The output of the stage 12 of the shift register 74 is also connected via a conductor 94 to the logic controller 77 for the selective triggering of the transmission relay. The output of the second inverting AND gate 86 is also located at the input of this logic controller Control for the selective relay trip comprises an inverting AND gate 95 and a flip-flop memory 96 _β The inverting AND gate 95 may have the same form / as the first and second inverting AND gates 85 and 86 »It works in such a way that it provides pulsed operation of the selective tripping of the transfer relay 101. The flip-flop memory 96 can have a conventional TTL flip-flop, which is used here to provide continuous operation for the triggering of the selective transmission relay; Note that instead a 'flip-flop for this purpose of an AND gate is used so that its memory capacity can be utilized to provide a residence time for the shift between the stages 11 and 12 of the shift register 74, so as to avoid time problems ₀ A. The input to the inverting AND gate 95 is connected via a conductor 94 to the output of the stage 12 of the shift register 74, the second input is connected via a conductor 97 to a timer 98 for the selective transmission. The timer 98 can be similar to the system clock 70 described above, except that the clock pulses are of slightly longer duration and the control input for the timing pulse generated therein is initiated by the pulse which is initiated by the. second light-sensitive device 8 'is generated when the dark edge is perceived by the second pair of time slices 5 ^f and 4 ^f. So if the second photosensitive device 8 ¹ is covered against the light source 7 by the leading edge of this disk during the rotation of the time slice 3 ^{1 of} the second pair of time slices 3 ', 4' on the shaft 5 of the insertion roller, the second photosensitive device 8 ^{1 generates} a positive-going trigger pulse for the timer

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98 of selective transfer. This trigger pulse is terminated during the further rotation by the trailing edge of the time disc 4 ¹ (360 ° - θ ·), which is given by the shift Θ ¹ between the time slices 3 ¹ and 4 ¹ · However, the leading edge of the clock pulse generated by the timer 98 is opposite to the leading edges of the pulses generated by the system clock 70 as a result the adjustable displacement φ between the leading edges of the time slices 3 and 3 'is delayed, as shown in Fig. 2D. This causes the transfer tape to come up to speed before it is brought into contact with the toner image on the photosensitive drum 20. The clock pulses of the system clock generator 70 are thus initiated by the position of the leading edge of the time slice 3, while the timer 98 generates clock pulses that are initiated ^{by the leading edge of the time slice 3 f.} The shift f & between the leading edges of the time slices 3 and 3 'thus determines the time delay between the pulses of the clock 70 and those of the timer 98 and thus the time difference between the initiation of the strip feed and the triggering of the relay 26 for the selective transmission mechanism. The slice shift fi can be changed due to the aforementioned adjustability of the time slices 3 and 4, as well as 3 'and 4'} in the case of printing labels or the like. for example, it would have to be chosen so that there is a time delay of 10 ms ₀

The output of the second inverting AND gate 86 is on applied to the data input (D) of the flip-flop memory 96, while the clock input (G) via the conductor 97 to the timer 98 for, the selective transmission mechanism is connected. The flip-flop memory 96 is therefore from an input from the AND gate 86 only when a clock pulse appears

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Timer 99 is set and then remains in this state until the next clock pulse appears; then he can go back to the The output state of the AND gate 86 can be set. The flip-flop memory 96 can therefore have a low input from the second inverting AND gate 86 to be set to its low state as soon as the timer 98 for the selective transmission a clock pulse is generated and remains in that state until it is reset to its high state when AND gate 86 goes high and a clock pulse is generated by timer 98. The AND gate 95 thus speaks to the presence of a selection signal, i.e. of a high level in stage 12 of the shift register 74 and produces a low output level when receiving of the next clock pulse from the timer 98 appears? flip-flop memory 96, on the other hand, becomes one when it appears Clock pulse is set to its low level if in stages 11 and 12 of the shift register 74 selection levels are present detected by the second inverting AND gate 86 and remains in this state until the Next clock pulse from timer 98 for the selective transfer mechanism gives him the opportunity to adapt to the output of AND gate 86. This means that the Output of the inverting AND gate to a selection level in stage 12 of the shift register 74 at the correct time goes low where the relay 26 of the selective transmission mechanism is to be triggered, which is indicated by the leading edge of the clock pulse of the timer 98 and that it remains low only for the duration of that pulse. As soon that is, a selection level is present in stage 11 of the shift register 74 which indicates that the next picture is also present is to be transferred, the flip-flop memory 96 is on its is set to the low state and remains in this state at least until the inverting AND gate 95 switches to the Shifting the bit information from stage 11 to stage 12 again goes low and the next clock pulse from the selective transfer mechanism timer 98 arrives

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this is a continuous operation of the selective transfer mechanism 25 upon the appearance of adjacent selection commands guaranteed »The outputs of the inverting AND gate 95 and the flip-flop memory 96 are with a inverting OR gate 99 connected. The inverting OR gate 99 may take the form of a conventional logic circuit that have a high when there is a low input level at one or both of their inputs Output level generated. The output of the inverting OR gate 99 is connected to the input of a driver stage 100. The driver stage 100 may take the form of a conventional TTL relay driver stage which is responsive to a high input level and an output signal of sufficient energy generated to control a relay. The output of the driver stage 100 is connected to a trigger winding 101 for the relay 26 of the selective transmission mechanism and, when energized, causes the relay 26 to drop out, so that the transmission strip is immediately brought into contact with the drum ο The logic control for the relay of the selective exercise] »- transmission mechanism is therefore after a sufficient delay, to speed up the transfer strip 9 bring, active and drop the relay 26; she does theea in a pulsed or continuous mode depending on whether the next image should be transmitted or not ο

The counter 78 can consist of a conventional 4-bit counter, which in a known manner each of its inputs from the cleared state up to an available number of sixteen counts. The clear input of counter 78 is, as shown, over with the output of timer 54 for the interrogation window a line 55 is connected, see Fig. 3 <> The data input of the Counter 78 is via a conductor 102 to the output of the system clock 70 connected so that the clock pulses generated by the latter are counted ", the task of the counter 78 is es, the system by de-energizing the relay in the start-stop signal generator 71 turn off after all invited

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Data cards are scanned and processed. It should be recalled that the timer 54 for the interrogation window generates a clock pulse only when the leading edge of an inserted data card is detected, while the system clock 70 generates a clock pulse for each revolution of the shaft of the infeed roller 5; under normal operating conditions, the counter 78 counts a pulse from the system clock 70 and is immediately cleared by a pulse from the timer 54 for the query window. As long as data cards are being fed, the counter 78 normally registers a count of one and is then cleared immediately, unless the card feed is intermittent, in which case several counts are registered. However, as soon as the entire stack of cards has been inserted, there are no more clear pulses from the timer 54 for the query window and the count of the counter 78 is continuously increased by the clock pulses from the system clock 70. The output of the counter 78 is, as Pigo4 shows, taken from the fifteenth counting position, but any preceding stage could also be used. The output of counter 78 is. applied to a driver stage 103, which may have the same shape as the driver stage 100 _e The output of the driver stage 103 is connected to the relay for the start-stop signal generator 71 and causes, when energized, the relay falls and so the system is turned off. Thus, when the count of the counter 78 reaches fifteen, indicating that no more data cards have been fed in the last fifteen machine cycles, the relay of the start-stop signal generator de-energizes, thus shutting down the operation. *

That a stack is invited by eleven data cards and for the description of the operation of the assumed in FIG? Shown logic and control circuit 3EI 4 that the settings of the selection modules 1-3 in Figo3 for the embodiment shown in Fig _o 3 sample-and-selection circuit, the the following sequence of information at the input of gate 72 result:

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Bit no. Status

1 selection

2 choices

3 jump

4 choices

5 jump

6 jump

7 jump

8 jump

9 jump

10 jump

11 selection

When the operator operates the start-stop signal generator 71, to start the machine there is a delay to warm up and close the relays before the Relay in the start stop signal generator 71 is energized, so that disturbance data originating from the noise is not a problem. The relay in the start-stop signal generator 71 holds the shift register 74 in the cleared state and in the de-energized state applies a low level to the input of the OR gate 72 «Then the relay closes and thus initiates the activity of the machine and the original to the OR gate applied low signal level is input to the flip-flop 75 as a first selection bit, hereinafter referred to as the Zero position bit is designated. This selection bit, which is automatically introduced at the beginning of the cycle, supplies a blank strip at the exit of the machine, which marked a new work cycle

The zero position bit is set by the flip-flop 73 in the first stage of the shift register 74 »It is followed in sequence by the bits 1-11 according to the table above, which are from the sampling and selection circuit of Figure 3 with each clock pulse to the OR gate 72 are applied, from where they the

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Flip-flop 73 are fed to the shift register Enter 74. When the zero position bit reaches stage 5 of shift register 74, its high level, indicating the off « Wahl characterized, applied to the input of the NOR gate 81 via the Xeiter 105. That’s the OR conditions of the NOR gate 81, which accordingly generates a low output level which is passed through the OR gate 83 to the Winding 84 of the development motor is applied to set the latter in motion »The one associated with the zero position bit Document information that is empty in this pail is now in the exposure station Co. that at this point in time bits 1-4 of the table above are fed into stages 4-1 of the shift register

As the zero position bit advances through shift register 74 to stage 10, winding 84 maintains development motor 14 on due to the action of NOR gates 81 and 82 on the high levels of the zero position bit and select bits 1, 2 and 4 after the zero position bit are shifted through the shift register 74 in sequence every 332 ms. Thus, when the zero position bit reaches stage 10 of shift register 74, the output of NOR gate 82 is low due to the presence of the zero position bit in stage 10, the one position bit in stage 9, and the two position bit in stage 8, while NOR gate 81 is low due to the presence of the Yiererpositionbits in stage 6 of the shift register 74 »For the selected example, the normally switched off development motor 24 is switched on when the zero position bit arrives in stage 5 of the shift register 74 and remains in operation until the selection bit in the fourth position of the stage 11 of shift register 74 reaches «Thereafter, development motor 24 is turned off because bits 5-11 are jump signals or low levels which do not meet the OR requirements of NOR gates 81 and 82 · The motor remains

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turned off until bit 11 reached level 5 of shift register 74. It can thus be seen that the developing device normally remains in the idle state so that no toner is wasted unnecessarily and the accumulation of residual toner is avoided, but that the developing motor is started early enough to ensure an adequate flow of toner when an image is to be tiber wear "and remains in operation as long as one is formed to be transmitted Bi ₁ Id on the photosensitive drum 20 or istο present in the developing station D

When the zero position bit reaches stage 12 of shift register 74, its associated high level is applied to inverting AND gates 85, 86 and 95 via conductors 87, 88 and 94 applied to prepare these gates «Simultaneously with the shift of the zero position bit into stage 12 the ones position bit, which is also a selection bit, is shifted into stage 11, and a clock pulse from the system clock 70, which causes this displacement, is present on the conductor 79. Thus 3 are the AND conditions of the first inverting AND gate 85 and the output of this gate goes negative for 230 ms »This represents the dwell time between the machine cycle and the duration of the clock pulse. The output of the second inverting AND gate 86 low, since there is a high level corresponding to the selection at each gate input is «However, the second inverting AND gate 86 remains low for msec, which is the machine cycle time or the shift speed of the shift register 74 corresponds. The outputs of the first and second inverting AND gates 85 and 86 meet the OR conditions of the OR gate 90, which then produces a low output level. This low output is connected to the input of the OR gate 91 supplied, which is also low and thereby energizes the winding 92 of the single-turn clutch 15, so

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that the advance of the transfer strip-9 begins. The low output of the second inverting AND gate 86 is also applied to the D input of the flip-flop 96; however, this flip-flop is only set by this input when a clock pulse is generated by the timer 98 for the selective transmission mechanism «,

After the transmission strip 9 has come up to speed and at a point in time which is determined by the position of the leading edge of the time slice 3 ^f with respect to the leading edge of the time slice 3, in the present case an interval of 10, for example ms, the timer 98 of the selective transfer mechanism generates a clock pulse which, under the conditions mentioned above, controls the inverting AND gate 95 and allows the flip-flop memory 96 to be set by the input from the second inverting AND gate 86. The exit . of the inverting AND gate 95 only remains low for the duration of the clock pulse, but the low output of the flip-flop 96 remains until it is later reset by the change in the output level of the AND gate 86 and the simultaneous appearance of a clock pulse from the timer 98 will. Both outputs, that of the inverting AND gate 95 and that of the flip-flop memory 96, are therefore low and the input conditions for the inverting OR gate 99 are therefore met. Thus, the output of the inverting OR gate 99 goes high, whereby the relay of selectively transmitting mechanism under the action of the relay driver circuit 100 and the relay winding is released 101 so that the transfer strip 9 rapidly in the manner described in FIG _o 1 manner with the photosensitive drum 20 is brought into contact. Thus, if there is a selection level in stage 12 of shift register 74, the paper will advance so that the transfer tape can come up to speed, and then relay 26 will turn on

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of the selective transmission mechanism to "fall away -, - with what the solenoid 27 of the transmission mechanism is de-energized and the selective transmission mechanism 25 in the is set in action based on the Pig. 1 in order to transfer the toner image

When the ones position bit in stage 11 of shift register 74 is shifted to stage 12 on the next machine cycle and the two position bit is shifted from stage 10 to stage 11, the first inverting AND gate becomes 85 low and shortly afterwards it follows. the inverting AND gate 95 · Due to the holding effect of the second inverting AND gate 86 and the corresponding effect of the flip-flop 96, the one-turn clutch 15 is not disengaged and that too Relay 26 is not closed. The transfer process runs continuously during this period because the Transfer tape 9 continuously advanced and from the transfer mechanism with the photosensitive drum is kept in contact. In addition, since the two position bit in stage 11 is also a selection bit, 3ich repeats during this cycle of operation has the holding effect of the second inverting AND gate 06 and the flip-flop memory 96. If however, on the next machine cycle, the two-position bit (selection) is shifted in stage 12, the three-position bit becomes the three-position bit (Jump) shifted to stage 11 of the shift register. Although the inverting AND gates 85 and, 95 of the Selection bit in stage 12 of the shift register is still satisfied, so that the one-turn clutch 15 is kept in "engagement" and the relay 26 remains de-energized, in each case for the duration of their corresponding clock pulses} the holding effect of the second inverting AND gate 86 and the flip-flop memory However, 96 is not brought into play. Therefore, de3 is applied to the first inverting AND gate 85 after termination System-Taktimpulsea the one-turn clutch 15 disengaged after a full revolution, with which the advance of the Transfer strip is finished. After finishing

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In response to the clock pulse supplied by the timer 98, the relay 26 is brought into contact, whereupon the transfer tape 9 is quickly lifted from the photosensitive drum 20 by energizing the solenoid 27 and pivoting the transfer mechanism 25. This condition remains with the above example of a data input sequence exist until bit 11 is shifted to stage 12 of shift register 74. At this point in time the pulsed operating mode begins again solely by activating the inverting AND gates 85 and 95 in the manner just described so, as soon as a selection bit enters stage 12 of the shift register, which corresponds to the position of the associated • document information in the vicinity of the transmission point E, the one-turn clutch 15 is engaged to initiate the gate push of the transmission strip 9, 'and a short time afterwards the relay 26 of the transfer mechanism lifted off »whereby the transfer strip en 9 is brought into contact with the drum 20 ₀ This is done by de-energizing the Eontraktionssolenoid 27, whereupon the expansion spring 28 drives the selective transmission mechanism 25 in its second position. This process is under the control of the system clock 70 and the timer 98 for the transmission and takes place in less than one machine cycle, unless the previous stage of the shift register 74 also contains a selection bit, whereby continuous operation is obtained for the entire machine cycle

Assuming that the infeed roller 6 is working properly, then the counter 78 receives a clock pulse from the system clock 70 for each revolution of the infeed roller 6 _? followed by an interrogation window timer 54 pulse when the leading edge of the data card is inserted and sensed. Since the system clock 70 is connected to the data input of the counter 78 and the query window timer 54 is connected to the clear input of the counter, the result is for

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~ 62 -

The above-considered bit sequence of the eleven data cards means that the counter 70 is set to one eleven times and then cleared. However, when the cards are used up, i.e. after the eleventh card has been entered, no deletions will be received from Timer 54 received more. From then on the counter switches one for each pulse received from the system clock Keep stepping until the count reaches fifteen. When the counter has counted to fifteen, there will be one for it Count characteristic signal applied to the driver stage 103, whereby the start-stop relay 104 is de-energized and the system is switched off. Then a next batch of data cards can be loaded for further runs or the signal generator 93 for the advancement of the 'transfer tape can be operated by an operator to the Strip section on which the selective copies have been applied to be output from the selective printing device «

The invention has been described above for a single detailed embodiment; but the broad term is more selective electrophotographic printing systems, like here a « described i3t, a multitude of variations, modifications and changes in the specific techniques set forth herein to be included in the invention. For example, the invention in the context of a selective Printing device described in the document information with relatively small dimensions on coded records imaged and selectively transferred to a copy element; yet the teaching of the invention is based on evidence information of any dimensions and any format applicable, so that within the scope of the invention all forms of information recordings can be selectively read out and copied on any conventional or suitable recording format «Also the invention is equally applicable to toner images of any dimension and to any transfer process, the one suitable form of a copier element, such as a sheet, a web, strip or drum is used. Further

309831/1090 e * o original

Any suitable winding and winding device or a belt conveyor can be used in place of the drive shown for the 'transfer tape, provided that this device is able to selectively stop and start the copying element used and, as soon as it is started, _{see FIG} to bring up to G-speed quickly. In the example shown, "complete toner images were transferred. The invention can, however, just as well provide for the transfer of selected parts of the toner images from appropriately coded recordings or the rearrangement of the format on a copier element. In the example, optical coding of the recording media was assumed, but can other coding and scanning techniques, such as magnetic coding and scanning, can be used. The invention is independent of the specific electrophotographic process used to produce an image to be transferred.

Instead of the special switching arrangements described for the scanning and selection and the logic and control can Many modifications can be used within the scope of the invention. For example, instead of the described sliding, Use delay circuits with variable taps. As the position of certain selection and jump bits in.der sliding device with the position of the associated document information in the electrophotographic process matches, you can derive any number of control outputs from it. The special logical configurations of the Abbe and description can be replaced by any conventional logical arrangements calculated so that they serve the same purpose; also specific logical elements can be varied at will to suit the chosen one Sufficient construction. In the selection circuit, more or fewer selection channels can be used to select the To meet the requirements of a special construction,

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and a greater or lesser selectivity can easily be achieved within a given selection channel _e

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Claims (26)

A copier system having a charge retentive surface for applying electrostatic latent images indicated by means for causing relative movement between the charge retentive surface and a plurality of processing devices including a developing device and a transfer device; by means for forming a latent image on this charge retentive surface; by means for developing the latent image into a visible image by the developing means; by means (25) for transferring the visible image to a transfer tape by the transferring means (25); and by a control circuit (Fig. 4) with an incremental device (7 ^z 0 with several output stages and with logic circuits which are connected mi ¹ J different stages and respond to the presence of first and second signals in different of these stages in order to at least one of the processing devices (25, 35) to initiate a control process, the first and second signals indicating whether or not information is to be recorded. 2. Apparatus according to claim 1 with means to sequentially record a plurality of .coded information carrying records through the processing device, with devices to enter from the successively introduced records forming a latent image on the charge retentive surface with means to make the latent images visible make, and marked with facilities for transferring the visible images onto a transfer tape by a scanning and selection circuit with code scanning devices for fixing the coded information, and by copy selection elements for setting various preconditions and for generating signals © of the first type that the selected recordings whose coded information corresponds to the entered 3 0 9 8 31/1090 ^ßÄ & ORIGINAL set preconditions are sufficient, as well as signals from a second Type for those records whose encoded information the Do not meet preconditions, the first and second signals in the time sequence of the sampling of the recordings appear and one type of signal consists of a high level and the other type of signal consists of a low or zero level. 3. Apparatus according to claim 1 or 2, characterized in that the surface holding a charge a photosensitive surface. 4. Apparatus according to claim 1, 2 or 3> characterized in that the transmission device (25) has a first Has the operating state in which it is arranged between it and the light-sensitive surface (20) as a copy carrier serving transfer strips (9) at such a distance from the photosensitive surface so that no image transfer can take place on the transfer tape, as well a second operating state, in which they the Überraf'ungsstreif en in the transfer station (E) brings into a suitable relationship for the transfer to the photosensitive surface. 5. Device according to one of the preceding claims, characterized characterized in that a continuously rotatable photosensitive device (20) is provided on which in a first station (C) with respect to the scope of a facility (33) for projecting optical images of the successive recordings on the photosensitive Device is provided during the rotation of the device, as well as at a second station (D) in a different circumferential position a developing device (35) 1 operating on a Activation towards the generated on the photosensitive device Images developed, further in a third station (E) a further circumferential position the image transmission device (25) for applying the transfer strip (9), with a strip ; ■> ■ 3 0 9 8 31/10 9 0 BAD OR'.CINAl fenantrieb (16) is provided, which during its periodic switching the transmission strip between the light-sensitive Device and the transmission device moved therethrough. 6. Device according to one of the preceding claims, characterized in that to the transmission device an ion emitting charger (30) comprising next to the third station is fixed in place. 7. Apparatus according to claim 6, characterized in that that the charger is continuously turned on. 8. Apparatus according to claim 6 or 7 _5, characterized in that the charging device (30) is a corona discharge device. 9. Device according to one of the preceding claims, characterized in that the transmission device Parts (25a, b, d, e) for holding and guiding the Transfer strip, as well as a bistable drive element (25h) which is normally retracted and deploying in response to a signal from the control circuit. 10. Apparatus according to claim 9, characterized in that the drive element (25h) has one end at one of the parts belonging to the bracket is fixed and anchored at its other end so that it is accordingly of the two possible states the holder of the transmission strip moved towards and away from the photosensitive device. 11. The device according to claim 9 or 10, characterized in that the for holding and guiding the over- 309831/1090 tragungsstreifens serving parts consist of a support frame (25a) and a roller (25e), which is held in a central position of the Eahmens and sitting on a for rotation ,, axis of the photosensitive means (20) parallel axis (25d) and of the support frame is held in the vicinity of the photosensitive device between the developing station and the exposure station during the retracted state of the bistable drive element (25h) and is moved towards the photosensitive device at the beginning of the extension of the bistable drive element. 12. Device according to one of the preceding claims, characterized in that the light-sensitive Device is formed by the surface of a drum (20). 13 · Device according to claim 11 or 12, characterized in that the support frame with its one end is attached to an anchor (25b) in such a way that it is pivoted about a pivot axis parallel to the axis of rotation of the drum is pivotable, which is on the same side of the drum as the roller (25e). 14. Device according to one of claims 9 to 131 characterized in that the strip holder also has a scraper (25f) attached to the support frame (25a) is rigidly attached and extends parallel to the axis of rotation of the roller (25e), but at a distance therefrom, so that it lies on the opposite side of the third station, and which also performs a greater stroke than the roller, when the support frame changes in position of the bistable drive element as a result of a signal from the controller to its The pivot axis is pivoted, and when the bistable drive element returns from the extended position to the retracted position Position together with the roll on the transfer 309831/1090 SAD original strip (9) exerts a wiping force on two closely adjacent points on both sides of the transfer point, which overcomes the attractive force between the transfer tape and the photosensitive drum. 15 device according to claim 14, characterized in that g e k e η η ζ ei chn et that the scraper is a scraper bar (25d) in such an arrangement that it is the transfer tape (9) detected on the side facing the photosensitive drum when they are being transferred of the bistable drive element from the extended to the retracted position simultaneously with the roller (2f? E) is moved away from the drum. 16. Device according to one of the preceding claims, characterized ζ eic. hnet that the drive (16) has a braking element (18) for the transfer strip (9), located on the side of the photosensitive drum opposite the third station, and a Transport element (16) for the strip feed on the same side of the drum, the braking element and the transport element being arranged relative to one another in such a way that the transfer strip is located extends from the former via the transmission mechanism (25) to the latter. 17. Device according to one of the preceding claims, characterized in that the drive (16) for the transmission strip (9) responds to the control circuit and each time a signal appears the * first Kind in a certain stage of the incremental device (7 ^ -) the transmission strip (9) by a predetermined distance transported further, with the transfer strip at keeps taut in all operating states. 309831/1090 18. Device according to one of the preceding claims, characterized in that the control circuit receives each signal of the first and second type and passes them on in time sequence such that an immediate Relationship between different levels of incremental setup (7 * 0 and different positions of the picture exists on the circumference of the drum. 19. Device according to one of the preceding claims, characterized in that the progressive Facility (7 * 0 one serial input and parallel outputs Has. 20. Device according to one of the preceding claims, characterized in that the progressive Device is a shift register (74). 21. Device according to one of the preceding claims, characterized in that the control circuit a first logic circuit (105, 81, 82, 83), to a first group of stages (5-10) of the progressive Device (7 ^) is connected to a first variety of image positions along the drum circumference, which are located between the exposure station (C) and the exit point of the development station, the logical Circuit only keeps the development device in operation as long as at least one signal of the first type is in at least one of the stages is present. 22. Device according to one of the preceding claims, characterized in that the control circuit a second logic circuit (87,88,89,76,90,91) belongs to a transmission stage (11) of the switching device connected to a picture position on the drum scope shortly before the transfer station, and also to a second stage (10) immediately before the first-mentioned 309831/1090 - 1Λ - Stage, and that this circuit "when it appears the Drive for the transfer strip for an image transfer starts and keeps in operation "even if a signal of the first type appears in the previous stage. 23. The device according to claim 22, characterized in that the control circuit also has a third logic circuit (94,77,99,100) belonging to the transfer stage (12) of the incrementing device (7 ^) connected and with the second logical Circuit is connected, and the transmission device (25) from its first working position to its second working position controls when the drive hits the transmission strip brought to the speed of the drum circumference, and the transfer device in its second Working position holds as long as a signal of the first type is also present in the preceding stage. 24. Device according to one of claims 2 to 23, characterized in that the scanner has several Scanning elements (50A-C) comprises, the such to each other are arranged to read encoded information in several bit positions of each interrogated record at the same time, and that a data channel (A, B, C) is assigned to each scanning element is. 25 «Device according to claim 24, characterized in that selection means (1, 2, 3) are connected, in which a given program can be set in the form of several alternative switching states is, the data channels corresponding to the coded information read by the scanning elements in time Sequence deliver high and low level signals. 3 0 9831 / 10.90 ** ^D 26. The device according to claim 25, characterized in that g e k e η η, that the selection means consist of several logical selection modules, - their inputs in Cascade are connected to the data channels, each selection module a plurality of alternative switching conditions has, through which the preconditions can be set, and where logical decoders are connected to the outputs of the selection modules are connected, which successively generate signals, depending on whether the coded information is a straight requested recording meet a preprogrammed precondition of one of the logical selection modules. 27. Device according to claim 25 or 26, characterized in that g e k e η η shows that the scanning elements (50A-C) are aligned perpendicular to the direction of movement of the recording and that a separate data channel is connected to each scanning element and that the inputs of the logical selection modules are connected in cascade to the outputs of all data channels are. 309831/1090