JPS58176653A - Copying apparatus - Google Patents

Abstract

PURPOSE:To exactly synchronize feeds of a sheet original and a copy sheet and to execute high speed automatic feed of the original, by providing two sensors on the upstream and downstream sides of an exposure window on a sheet original feed route, and controlling start and stop of original feed. CONSTITUTION:A sheet original Os is fed one by one from a tray 55 with a pair of slipping rolls. The interval between the originals Os successively fed from the rolls 56, 57 are enlarged with a pair of high-speed rotation feed rolls 61, 62. When the forward end of the original Os is detected with a sensor 60, its feed is stopped. When a copy sheet is detected with a sensor 90, the original Os kept still is refed. When the backward end of the original Os passes through the sensor 60 and a signal telling the absence of the following original is delivered, feed of the original Os is stopped. Register rolls 37 are actuated when a sensor detects arrival at an original discharge route.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus, and more particularly to a copying apparatus equipped with an automatic document feeding device.

Conventional copying apparatuses can be roughly divided into two types: apparatuses exclusively for sheet-based originals, and copying apparatuses capable of copying three-dimensional thick originals such as books.

Sheet original-only machines cannot copy thick originals such as books, but sheet originals can be copied by simply feeding them into the insertion slot, and for the same process, the back-stroke of the original table or optical system is required. Since there is no error, the copying speed can be increased by that amount.

Furthermore, since the structure of the copying device is simple, the price is low. Additionally, as high-speed copying devices become available, an automatic document feeding device is desired, as feeding sheet documents manually cannot keep up with the speed of the device and is inefficient. Such devices can be easily installed.

On the other hand, there are devices that can copy thick originals such as books.

It has the great feature of being able to copy sheet originals, but due to its structure in which thick originals are spread flat on the document table and copied, when copying sheet originals, the original is You need to open the cover, place the document on the document table, close the document cover, and then press the copy button. Also,
In this type of apparatus, since there is a backward movement of the document table or the optical system, there is a corresponding loss of time, and the copying speed is inevitably reduced for the same process. Further, the structure is complicated, the price is high, and it is extremely difficult to provide a structure equipped with an automatic document feeding device.

For the reasons mentioned above, these two types of copying devices have their own market fields, but there is currently a demand for a copying device that has the functions of the two types of devices described above. In particular, copying machines equipped with an automatic document feeder are highly desired due to their ease of operation and high copying speed.

2. Description of the Related Art A conventional automatic document feeder is provided with a document mounting table on which a sheet document to be copied is placed, and a document tray for storing the document discharged after copying. Both have flat surfaces large enough to place a sheet original of the maximum size that can be copied, and are often provided so as to protrude from the outside of the copying apparatus.

Therefore, it has been relatively easy for a user to operate the document placing table and the document tray from the outside.

However, in such an automatic feeding device, the document placement table and the document ejection tray are arranged one above the other, and furthermore,
In many cases, the document placement table is located at the bottom and the document tray is located at the top. This configuration is based on the following reasons.

In other words, when separating multiple sheet originals placed on the original placing table one by one and feeding them into the apparatus, it is necessary to separate and feed the topmost sheet of the placed originals. It is the easiest and the least likely to fail. Further, it is desirable that the originals discharged onto the original tray be stacked in the same order as when they were placed on the original placing table.

Furthermore, the copied sheets are also ejected and stacked in the same order as the sheet originals placed on the original document tray, and there is no need to align the pages, which is extremely convenient. Considering these points and considering the conveyance path of the original and transfer paper,
In many cases, the document mounting table and the document tray have the arrangement described above.

A copying machine equipped with such an automatic document feeding device is
Copying speed can be significantly improved □.

However, the smaller the size and the faster the process, the more difficult it becomes to control the registration rollers that accurately determine the position of the leading edge of the image and the continuous drive system that feeds the original. This caused a problem in which accurate control was difficult.

The present invention has been developed in view of the above-mentioned circumstances, and it is possible to sufficiently achieve high speed, which is a feature of automatic document feeding devices, and to accurately control the registration rollers, so that the document feeder is able to achieve the high speed that is a feature of automatic document feeding devices. , and subsequent originals.

In the present invention, in order to achieve the above objects, -3.
A first detection means for detecting the leading edge and a trailing edge of the document is provided in one document conveyance path, a second detection means for controlling the conveyance of the copy material is provided in the copy material conveyance path, and a first detection means for detecting the leading and trailing edges of the document is provided in the document discharge path. A third detection means is provided for detecting the ejection of the document, and the conveyance of the original is stopped in response to the output of the third detection means, and restarted after a predetermined timing according to the output of the second detection means. , and further 5. A configuration is adopted in which it is stopped in response to the output of the first detection means.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a copying machine in which the present invention is used. This copying machine is a powder development transfer type electrophotographic copying machine. 1 is a transparent document placement table, and document 0 to be copied is placed on it.
8 is placed with its leading edge aligned with the reference position on the document mounting table, and is held down with the document cover 2. A document illumination lamp 3, movable mirrors 4 and 5, a fixed in-mirror lens 6 and mirror 7, and a photosensitive drum 8 are arranged below the document table 1 at the position shown by the solid line. Further, a fan 50 is arranged to cool the document table which is heated by the document illumination lamp.

When a copy button (not shown) is pressed, the photosensitive drum 8 begins to rotate clockwise in the figure, and is charged and irradiated with light by each charger and each lamp, which will be described later.At the same time, the photosensitive drum 8 is charged and irradiated with light by each charger and each lamp, which will be described later. 3. Movable mirror 4.5
moves to the position shown by the broken line in the figure (the solid line part is BHP (
1 and 2) have the sensor B, and the position indicated by the broken line is OHp and has the sensor A). When the photosensitive drum 8 completes a predetermined rotation, a signal to start exposure is issued, and the document illumination lamp 3 and the first Milani 4 move rightward from the broken line position shown in the figure at the same speed as the circumferential speed of the photosensitive drum 8. Also the second
The mirror 5 also starts moving rightward from the position shown by the broken line at half the speed. At this time, the document illumination lamp 3 scans from OHp to BHP, and at this time it passes through the registration sensor C. When this sensor is turned on, the registration roller 37 rotates and synchronizes with the transfer paper.

Original 0 illuminated from below by the original illumination lamp 3
The image of the sun is formed by an optical system consisting of movable mirrors 4, 5, an in-mirror lens 6, a mirror 7, etc.
image on top. When the exposure is completed according to the signal corresponding to the size, the document exposure lamp 3 and the movable mirrors 4 and 5 stop moving to the right in the figure, immediately return to the opposite direction, that is, to the left in the figure, and then press a button (not shown). The above operation is repeated according to the number of copies specified in advance. When the exposure for the specified number of sheets is completed, the document illumination lamp 3 and the movable mirrors 4 and 5 return to the predetermined positions indicated by solid lines in the figure and stop. Note that in the figure, the speed of movement to the left is faster than the speed of movement to the right in the figure to increase copying efficiency.

The photosensitive drum 8 has a photosensitive layer covered with a transparent insulating layer, and rotates clockwise in the figure as described above. The photosensitive drum 8 is first connected to A from a high voltage power source (not shown).
AC is supplied with high voltage current by the pre-static eliminator lO.
At the same time as being subjected to static electricity removal, it is exposed to light from the lamp 11,
Charges on the surface of the insulating layer and inside the photosensitive layer are erased, and then the entire surface is charged to (+) by a primary charger 12 supplied with a (+) high voltage current from a high voltage power source (not shown). Subsequently, when the fourth light section 9 is reached, the image from the illumination section 13 is exposed to light, and at the same time, the AC is connected to the high-voltage power source (not shown).
An electrostatic latent image of the document is formed by receiving AC static electricity removal by the AC static eliminator 14 supplied with high voltage current.

Then, an electrostatic latent image with gradation is formed on the surface of the photosensitive drum 8 by the next entire surface exposure by the lamp 15, and the image enters the developing device 16. The developing device 1B includes a container 17 containing developer, a developing roller 18, and a doctor blade 18.
The electrostatic latent image on the photosensitive drum 8 is visualized by the developer magnetically attracted to the developing roller 18.Next, the copy material fed from the paper feed section is brought into close contact with the photosensitive drum 8. Then, the image on the photosensitive drum 8 is transferred onto the transfer paper by charging with (÷) high-voltage current from the high-voltage power supply in the transfer charger 20. After the transfer, the copy material is charged with the high-voltage current from the high-voltage power supply.
The static electricity is removed by the separation static eliminator 21 supplied with high-voltage current, and the adhesion force with the photosensitive drum 8 is weakened. Subsequently, the copying material is sucked by a roller 23 at a portion 22, separated from the photosensitive drum 8, and guided to a fixing section 26 by a belt 24 and a guide 25. The remaining developer on the photosensitive drum 8 is wiped off by the edge 27' of the plate cleaner 27 that is pressed against it, and the next cycle is repeated again. After repeating, continue rotating,
The charge inside the photosensitive layer is removed by the above-mentioned AC static eliminator 14 and full-surface exposure using the lamp 15, and the photosensitive layer rotates a predetermined amount and then stops in preparation for the next cycle. - Actual copy materials are stored in a cassette 28 or a paper feed deck 28, and the cassette 28 stored in the paper feed section at the bottom left of the machine is prepared in various sizes to accommodate several types of copy materials, making it easy to use as needed. can be exchanged for Further, the paper feed deck 28 is constructed and constructed so that copy materials of several sizes can be stored with a simple operation as required. Regardless of the amount of copy material stored in the cassette 28 or paper feed deck 29, the copy material is applied to the paper feed rollers 30, 31 with a predetermined pressure.
is pressed against. When the photosensitive drum 8 reaches a predetermined position, the preselected paper feed roller 30 or 31 starts rotating by a button (not shown) and guides the copy material rightward in the figure 34, 34', 35°3.
Send it out along 5'. Subsequent paper feeding is done by roller pair 3.
This is done by paper feeding means after 2.32' or 33.33'. Copying material is loaded with roller pairs 36.38', 3
7.37' (registration roller (2REG)), guide 38°38' or 39.39' and 40.40
, 41, 41', and after being synchronized with the image on the photosensitive drum 8, it comes into close contact with the photosensitive drum 8, and as described above, the image is transferred by being charged by the transfer charger 20. As described above, the copying material after the transfer is neutralized by the separation static eliminator 21, separated from the photosensitive drum 8 at the position 22, and sent to the fixing section 26 by the belt 24 and guide 25 driven by rollers. . In the fixing section 2B, the copy material having an unfixed image on its surface is fixed by being subjected to a predetermined pressure when passing between rollers 42 and 43 that are pressed against each other with a predetermined pressure and rotate at the same peripheral speed. The copying material leaving the fixing section 28 is finally discharged onto a tray 49 by being led to discharge rollers 47, 4B by guides 45, 4B after removing any charge remaining on its surface by a static eliminator 44.

On the other hand, an autofeed device 51 is provided at one end of the upper part of the copying machine above the cassette 28 or paper feed deck 28. The optical system of the autofeed device 51 includes a document illumination lamp 52, a fixed mirror 53, and a movable mirror 54. During the copying operation for the original on the original platen 1, the autofeed movable mirror 54
The lamp 3 and the movable mirrors 4 and 5 are placed at a position where the optical path will not be obstructed even if the lamp 3 and the movable mirror 4 and 5 are moved to the position shown by the chain line in the figure in order to expose the original OB on the document table 1, that is, the position shown by the chain line in the figure. It is provided in the first position shown by.

Also, when using autofeed, the original illumination lamp 3
, the movable mirror 4.5 stops at the position shown by the solid line in the figure,
The autofeed movable mirror 54 moves to the right from a first position shown by a chain line in FIG. 1 and stops at a second position shown by a solid line. At this time, an autofeed optical path is formed by the autofeed document illumination lamp 52, fixed mirror 53, movable mirror 54, in-mirror lens 6, and fixed mirror 7.

The autofeed device 51 is provided with a document storage table 55 . This document mounting table 55 is rotatably provided around a shaft 72, and is placed in a horizontal state as shown by the chain line in the figure except when used as an autofeed device.

The original O3 placed on the original placing table 55 is sent out while being separated from the uppermost original O3 by separating and feeding rollers 5B and 57 arranged near the lower end of the placing table and rotating in opposite directions. Sent between 58 and 59,
The tip is detected by the first detection means 60 and it is temporarily stopped.

When the copy material stored in the cassette 28 or the paper feed deck 28 & reaches the predetermined position, the original OsL*rollers 5B, 5? The copy material is conveyed between the guide glass 63 and the guide plate 64 by the rollers 81 and 82 in synchronization with the copy material, and is illuminated by the lamp 52 to image the original Os.

Next, the original Os is transferred to the roller 85. Be guide f(?, 88
The document is sent out from the middle of the document tray 71 by discharge rollers 89 and 70. This document tray 71 is rotatably supported by a shaft 73, and can be moved between an erected state at a fixed angle shown by a solid line and a horizontal state, similar to the document table 55. It is said that the configuration is possible.

The autofeed device 51 is cooled by a cooling fan 50 located below.

If the autofeed device 51 as described above is used,
It is possible to copy even originals that are stacked one by one and continuous long originals. Also,
By providing the accommodating portion of the cassette 28 below the autofeed device 51, the cassette 28 can be accommodated in an enlarged portion of the machine body, and wasted space within the machine body can be used effectively.

By the way, since most of the mechanical parts of the autofeed device 51 are housed in the device as shown in FIG. 1, the original enters the device and is copied. Therefore, in the event that a document jams, or a signal due to a copy material jam occurs, the autofeed device 51 is activated.
If the driving power of the copying machine is turned off, there is a possibility that the original document may remain inside the copying machine.

As a general rule, manuscripts cannot be damaged under any circumstances. For this reason, the device of the present invention employs a structure as shown in FIGS. 2 to 5.

FIG. 2 shows a case where the document placement table 55 and document tray 71 of the autofeed device 51 are not in use, and the third document tray 71 is not in use.
The figure shows a case in use. When the autofeed device is in use, the document mounting table 55 and document tray 71 are rotated clockwise in the figure around shafts 72 and 73 as shown in FIG. The angle remains tilted. The autofeed device is configured so that the autofeed device does not operate even if the copy button is pressed unless the document tray 71 located below the document tray 71 is opened. This is because when only the document tray 55 is opened, even if the i-document O8 is fed into the autofeed device by pressing the copy button, if the document tray 71 is not opened, the document will end up on the ejection roller. Original tray 7 after E19,70
This is because the document is ejected folded into an accordion shape within the document 1, causing great damage to the document. For this reason, a microswitch 76 is provided below the document tray 71, and when the document tray 71 is opened, its actuator ? The configuration is such that the autofeed device is driven only when the button 8a is pressed and turned on.

Further, the document placement table 55' and the document tray 71 are not interlocked, and consideration is given to prevent the document placement table 55 from hitting the hand holding the document tray 71 during storage and damaging the hand.

On the other hand, as shown in FIGS. 4 and 5, the mechanical portion of the autofeed device 51 is configured to be divided into two parts.

That is, a portion including the guide 67 and the discharge roller 70 is integrated with the side wall of the copying device, and is rotatably attached via a shaft 77. Assuming that this part is the first rotating part 82, a stopper 78 is provided at one end of this first rotating part 82, and it can be hooked to the copying machine side via this stopper 79, and can be closed. It is possible to maintain the same condition.

Therefore, if this first rotating part 82 is opened, the roller fi5
, 6B to the discharge rollers 119, 70, most of the jammed originals can be processed.

When the first rotating section 82 is closed, the microswitch 80 is turned on and the drive power of the auto feed device is turned on, but when it is opened, the microswitch 80 is turned on.
0 is turned off and the drive power is cut off.

Reference numeral 83 indicates a second rotating portion, which includes the guide 58, the guide plate 64, and the guide 68, and is rotatably supported around the shaft 78.

Of course, the document tray 71 also constitutes a part of the second rotating section 83. Therefore, if this second rotating part 83 is rotated clockwise about the shaft 78 as shown in FIG. 5, the roller 5B,
5? It is possible to completely process the jammed originals in the subsequent stage, that is, inside the apparatus. By the way, when the second rotating portion 83 is rotated, the document tray 71 is further rotated clockwise in the figure, and the document tray 71 is rotated further clockwise in the figure.
An accident may occur in which some originals already remaining on the tray fall off the tray. In order to prevent this accident, it is necessary to remove the original from the original tray 71 in advance and open the second rotating portion 83, which is a complicated operation.

In the present invention, in order to eliminate such complication, the tip of the document tray 71 is long enough to touch the document tray 55 when the first rotating section 83 is opened, and the second rotating section is When the moving part 83 is opened, consideration is given so that the document tray 1 can be maintained in a state tilted upward from a horizontal state. In other words, since the document tray 71 is designed to maintain an upward position to the right when the second rotating portion 83 is opened, an accident such as the document falling does not occur.Of course, the tip of the document tray 71 The other party with which it comes into contact may be other than the original table 55.

Furthermore, by providing the second rotating part 83, by opening it, the mechanical part of the auto feed device 51 can be easily accessed, allowing replacement of the lamp and parts or cleaning of the lamp case 81. It is extremely easy to do.

By the way, sheet original O8 separation and feeding roller 5B,
5? , and its tip is detected by the first detection means 60 . However, the separation/feeding roller 511
1.5? The sheet original O8 separated by the roller 5B,
57, the distance between the trailing edge of the previous document and the leading edge of the next document is approximately 0. Therefore, it is impossible to detect the leading edge or trailing edge of a document using a reflective or passing type detection element. For this reason, the feed speed of rollers 81 and 82 located downstream in the direction of movement of the document O5 is made faster than the feed speed of rollers 5G and 57 so as to increase the distance between the front and rear documents to a detectable extent, and the rollers 5B, 5? A one-way clutch is inserted into the roller 5B that rotates in the forward direction with respect to the traveling direction of the original, and the original O5 is rotated in the forward direction with respect to the traveling direction of the original.
The document was pulled by 1,82 yen to maintain a predetermined distance between the front and rear documents.

However, if such a structure is adopted, the roller 61.8
The conveyance force of 2 is roller 5f! , 5? be larger than that of , and driven by rollers 5B and 5? A separate drive system was required, and the drive was not turned on and off.

Further, in such a structure, a pair of rollers is required on the upstream and downstream sides of the guide glass 83 in the document feeding direction in order to prevent the sheet document from lifting up and to ensure stable document feeding. For this reason, conventionally the roller 61. In addition to E12, a roller is provided on the guide glass 83 to prevent the sheet document from lifting up.

However, roller 5B, 5? The distance between Ell and Ell 62 had to be sufficiently large to ensure the distance between the front and rear originals as described above. However, if the difference between the feed speeds of rollers 5B and 57 and the feed speeds of rollers Ell and 82 is too large, a large shock will occur when sheet document O5 rushes into rollers 81 and 82, giving a shock to the drive system, and this shock This was causing image blur.

Therefore, the feed speed of the rollers 61 and 62 is vl,
If the feed speed of rollers 5B and 57 is v2, then v2
= o, ev. In order to make the distance between documents obtained at such a feeding speed sufficiently detectable, the first detection means 60 must be mounted as close to the rollers 61 and 62 as possible.

However, if the document O3 is brought too close, the inertia of the rollers 56 and 57 will cause the document O3 to rush between the rollers 81 and 62, and the document will be sent to the guide glass 63, eventually causing the registration of the copy material to be aligned. Not only will it be lost, but it will also lead to the original being jammed.

In order to avoid such inconveniences, conventionally a structure has been adopted in which brakes are applied to the rollers 5B and 57. Therefore, even if the first detecting means 60 is brought closer to the rollers 81, 62 by this brake, the original is not detected by the rollers 61, 82.
It never broke into.

However, since the brake load is large, the rollers 56, 5
Turning on and off the drive of No. 7 greatly affects the entire drive system, causing drive load fluctuations during exposure and further causing image blur.

In order to eliminate such inconveniences, in the present invention, the driving sources for the rollers 5B and 57 and the rollers Ell and 82 are the same, and one-way clutches (not shown) are provided for the rollers 81 and 132 in the direction in which the document advances. It is a container.

Roller 61, 1+2 to roller 5B, 5? By using the same drive source as that of rollers 131.57, when the drive of rollers 513.57 is turned off, the drive source of rollers 131. The drive of E12 is also turned off, and the document O5 is moved to the inertia rollers 131, 1.
32, the original O8 can be stopped far before the exposure position. Therefore, there is no need for a conventional brake.

Also, the roller 61. (The reason why a one-way clutch is provided at 32 will be explained.The sheet original O3 sent out by the rollers 5B and 5? is detected by the detection means from the time it is sent out until the leading edge is detected by the first detection means 60. The previous document is being fed at speed by rollers 131.62 at a predetermined interval greater than the paper distance.However, the leading edge of the subsequent document is detected by first detection means 60, and rollers 56.57 and 81, 1112 is turned off, the trailing edge of the previous document is still on the roller 131.E1.
It is caught between the two. If the rollers 81 and 82 stopped in this sandwiched state, the brakes would be applied even though the previous document was being exposed, which would be a major cause of image blur.

Therefore, by inserting a one-way clutch into the rollers 81 and 82, when the leading edge of the previous document is positioned on the downstream side in the document feeding direction and is pulled by the disposed rollers 135 and 68, it can be easily passed between the rollers Ell and fl12. pulled out,
This means that image blur no longer occurs.

Because this structure is adopted, one separation/feed roller 5B
, 57 and the rollers 81, 82 can be reduced, and the automatic document feeder can be downsized.

By the way, the copying machine according to the present invention is automatically controlled by a microcomputer MC as shown in FIG.

This microcomputer MC receives automatic document supply selection and magnification selection signals, a supply port sensor A, a discharge port sensor AF, which will be described later, a copy button on the display panel, a signal caused by pressing a stop button, a last detection signal, etc. Registration signal, sheet control signal, sheet same size (R1,
R2) signals, etc.

The copying machine according to the present invention starts its operation by a copy start signal as shown in FIG. 8. At the time of starting, the copying machine first checks the mode. Since it is targeted at copiers, automatic document feeding mode (1 size, 1 size,
Since the sequence of the present invention is carried out only in the case of (including enlargement), only the case of the automatic document feeding mode will be described below.

When the copy button is pressed, the main motor is turned on and the apparatus starts as shown in FIG. Then, during the pre-rotation, the document is transported at an appropriate timing (T1) (sheet control S and sheet equal size control 5RI). When the document begins to be conveyed, a first detection means indicated by reference numeral 60 in the figure detects the leading edge of the document. This first
Detecting means are skew sensors 2 and 2 shown in Fig. 8 as
These sensors detect whether or not the document is fed with the leading edge skewed. When this occurs, a detection signal SS1 is transmitted, and the document is temporarily stopped after only a slight movement (sheet control is turned off). This once stopped document is detected after the copy material being conveyed within the main body of the apparatus is detected by a second detection means called the paper feed port sensor A indicated by the reference numeral 90 in FIG. , at a predetermined timing (eighth
(indicated by symbol Y in the figure) restart signal S2 transmitted after
will be restarted by

The restarted original is detected by the ejection port sensor AF, which is the third detection means on the downstream side in the transport direction. 5, the sheet control signal S2 is temporarily turned off by the detection signal AF1, and the upstream drive system (rollers 56, 57 and l(1,
62). However, since rollers 61 and 62 are equipped with one-way clutches, they become free, and the document is transferred to rollers 65 and 65 on the downstream side. H, the paper is transported in the discharge direction without stopping.

On the other hand, a timer is started in synchronization with the restart signal S2 and in consideration of the reduction ratio information in the automatic document feeding mode. When this timer counts up (indicated by symbol X in FIG. 8), a registration signal R1 is generated and the registration roller (indicated by symbols 37 and 37' in FIG. 1) is generated.
is driven.

On the other hand, the document that has restarted has a skew sensor ■.

The rear end is detected by the first detection means eO consisting of (2). At this time, if a signal indicating that there is no subsequent document (last signal) is input, the sheet control SSI for supplying the document is immediately turned off. Then, supply port sensor A (second
The copying process waits for the signal PA2 from the detection means 80), repeats the above-mentioned sequence, and performs copying.

By the way, FIGS. 7(A) to 7(E) are flowcharts specifically explaining the operation of the copying machine according to the present invention, and this flowchart shows a case where copying is performed using an automatic document feeding device. There is. This flowchart is PART
It can be divided into 1 to PARTV, and each PA
Each RT has its own function.

Each PART machine #@4. [The outline is as follows.

PART I is the part (A) from 5uaAF to step 200, in which the paper feed port sensor 80, which is the second detection means, is monitored, and the output from this sensor drives a timer, and the automatic document feeding device is activated. This is a part of the flow that restarts the document in cooperation with the first detection means 80, which is a skew sensor provided on the conveyance path.

PART If is a flowchart section in which the restarted original turns on the registration roller at a predetermined timing and stops the document feeding drive with the restart signal, and this is done in steps 201 to 300 (B).

PART III is the part (C) from step 300 to AF2, and if the flow does not flow due to the jam shown in step 1000 in FIG. Further, this is a part that generates an original start signal until a jam check is performed up to the first detection means provided on the document conveyance path and a temporary stop of the document is executed using this first detection means.

PARTIV is a part from steps AF2 to AF400 (Ill), in which a jam check using the first detection means and a temporary stop of the document are executed.
PARTTV is a jam sequence after restarting the original and is a portion (E) that is not directly related to the present invention.

Details from PART I to PARTTV will be described below.

[PARTI] (FIG. 7(A)) This part of the flow is executed at a timing suitable for the copying apparatus according to the present invention. When 5uaAF is entered according to this timing, first, in step 100, it is determined whether or not there is a document restart signal based on a signal from the second detection means 80 shown in FIG. . This step 100 is a step for determining whether or not the memory function for this purpose is flagged, but this memory function is not initially set, so the process proceeds to step 103. This step determines whether or not a flag is set for the memory function that performs the input check of 80, but it is also not set at the initial stage. Therefore, the signal entering the 5uaAF proceeds to step 101, where a check is made for the presence or absence of a signal from the main body, that is, a signal from the second detection means 80 indicated as paper feed port sensor A, and it is determined that this signal is not output. In this case, it enters PART n (FIG. 7(B)). If there is a signal, a memory function shown as 104 is set in step 103, and it is determined in step 105 whether or not the image is the same size, and if it is the same size, a timer 108 is set. When is set, the memory function of 103 executes timer counting by the counter, and when it is determined in step 10EI that this timer counting has ended, step 1
At step 07, the sheet control is turned on, the original is restarted, and the memory function in step 100 is set.
The memory of 03 is reset and if no count-up is performed, PART II is entered.

If it is determined in step 105 that the size is not the same, the process proceeds to step 105', where it is determined whether or not the reduction ratio is R1. If it is determined that the reduction ratio is R1, the timer 108A is set, and it is determined that the reduction ratio is R2. The timer 1088 is set, and the process proceeds to step lo6, where the above-described procedure is repeated.Thereafter, the process proceeds from step 1oo to step 102, where the second detection means 9o is checked, and the output from the second detection means 90 disappears. Then, copying of the first manuscript is completed and the process returns to the initial stage.

[PARTnl Also in this part, initially, there is a step 201 to determine whether there is a registration signal, a step 202 to determine whether or not the document has been ejected from the automatic document feeder, and an ejection port sensor 75 ( Step 203 for determining the detection state of the third detecting means) and step 207 for determining whether the image is the same magnification are not set and are passed.

Then, when the document discharge sensor (third detection means) is set, the sheet control is turned off, a timer for generating a registration signal is set, and flow 204 is entered. Flow 205 is entered as the timer counts up, the registration signal is set, and the registration roller 3? ,
3? ' is driven.

Specifically, the registration signal is set at the sensor 75, which is the ejection port sensor (third detection means) located on the ejection side after the exposure position of the document transport system. , the tip of the arm is detected, and step 207.2
0? This is when each timer that takes into account the reduction ratio information of the automatic document supply mode counts up in step a. When it is determined in step 201 that a registration signal has been generated, the process proceeds to step 206, where the third detection means is checked, the memory in step 201 is reset, and the process returns to the initial stage.

On the other hand, the trailing edge of the restarted document described in PART I is detected by the first detection means 80,
At this time, if a last detection signal indicating that the document is the last one is received, the sheet control is immediately turned off.

Further, if the last detection signal is not input, when the next document is fed and its leading edge is detected by the first detection means 60, the sheet control is turned off and temporarily stopped, and the sheet control is turned off and stopped temporarily. Upon receiving the signal from the detection means 90 of No. 2, it is restarted in the same manner as described above, and the same operation is repeated thereafter.

[PARTIfi] In this part, a jam timer and its drive system are set in relation to the reduction ratio mode of the apparatus. In this flow, once the memory in step 303 is set, the flow proceeds to steps 301 to AF2. The subsequent on/off of the drive system does not affect this PAR↑■, but when the memory in step 303 is reset, the process returns to the initial state and the drive system described above is set.

[PARTTV] When it is determined that there is no jam by PARTl[ and the document is initially driven, a delay jam check up to the first detection means is performed in steps 350 to 351.
360, and when the delayed jam check is completed, a skew jam check of the document is performed in steps 350 to 351 to 361. Upon completion of the skew jam check, an original pause is performed by step 356. And steps 350-35
When the trailing edge of the document is detected by the first detection means in step 5, the memory is reset in step 357 to check for a jam in the conveyance of the next document, and the process returns to the initial state.

As is clear from the above description, according to the present invention, the first detection means for detecting the leading edge and trailing edge of the document is provided in the document conveyance path, and the conveyance of the copy material is controlled in the copy material conveyance path. A second detection means is provided, and a third detection means is provided in the document ejection path for detecting the ejection of the original, and the conveyance of the original is stopped according to the output of the third detection means, and the conveyance of the original is stopped according to the output of the third detection means. Since the copying speed is increased and the registration rollers can be driven accurately, the copying speed is increased because the copying speed is restarted after a predetermined timing according to the output, and further stopped according to the output of the first detection means. , it is possible to reliably detect continuously conveyed documents and perform accurate copying operations.

[Brief explanation of drawings]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a vertical side view, and FIGS. 2 and 3 are enlarged vertical side views of the main parts of the document placing table and the document tray in a closed state and an open state. Figures 4 and 5 show the state in which the first rotating part is opened and the state in which the first rotating part is opened and the first rotating part in the opened state and the first rotating part in the open state and the first rotating part in the open state, respectively. FIG. 6 is a block diagram of the control circuit, and FIGS. 7(A)-(
Figure 8 is a flowchart, and Figure 8 is a timing chart. 1... Document table 8... Photosensitive drum 55...
・Document mounting table 80...first detection means 71...
・Document tray 82...first rotating part 83...
Second rotating part 80...Second detection means A...First timer B...Second timer〇...Microcomputer Sl...Pre-rotation signal S2...Paper feeding Signal S3...
・Rear rotation signal

Claims (3)

[Claims] (1) In a copying apparatus equipped with a document transport means for feeding a document to a predetermined position and ejecting the document from there, a first detection means for detecting the document is provided in the document conveyance path, and a first detection means for detecting the document is provided in the copy material conveyance path. A second detection means for controlling the conveyance of the material is provided, a third detection means for detecting the discharge of the document is provided in the document discharge path,
Conveyance of the original is stopped in response to the output of the third detection means, restarted after a predetermined timing in response to the output of the second detection means, and further in response to the output of the third detection means. A copying machine characterized in that the feeding section of the document conveying means is stopped when the document conveyance means stops. (2) The supply signal for the subsequent original is generated at a predetermined timing after the trailing edge of the preceding original is detected by the third detection means, as claimed in claim 1. Copying device as described. (3) The supply signal for the subsequent original is generated at a predetermined timing after the trailing edge of the preceding original is detected by the first detection means. Copying device as described.