JPH07149441A - Sheet carrier device and reader - Google Patents

Abstract

PURPOSE:To maintain the standby position of a rotator to handle and deliver sheets and reduce cost and design load by calculating the rotating number of the rotator and controlling the stop angle corresponding to the end position of the sheets detected in a period from starting rotating the rotator to stopping rotating the rotator. CONSTITUTION:When a start button on an operation panel C is pushed, a stepping motor is driven so that an original is held by a preliminary carrying roller 2 and a preliminary carrying and thrusting piece 26 with the end handled. The preliminary carrying roller 2 approximately oval-shaped is on standby at a stop angle theta of 5 deg. to a sheet carrying direction when on standby, and controlled to be rotated a preset number and returned to the standby position after the reading of the original is completed. The rear end of the original is detected by a DES sensor, an original discharge roller 6a driven by the stepping motor is rotated a preset number in accordance with the detection signal of the DES sensor to discharge and load the original on an original discharge tray.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a facsimile, a copying machine,
The present invention relates to a sheet conveying device equipped in a printer or the like.

[0002]

2. Description of the Related Art The structure of a conventional reading device is shown in FIG. A document placed on the document table (not shown) with the image side facing down is inserted from the insertion port 51, the sensor lever 52 is rotated, and when the sensor (not shown) detects the document, the preliminary conveyance roller
53a is rotated to feed the inserted document.
It is separated together with b, and the preliminary feeding is started. And
The pre-conveyed originals are separated and conveyed one by one by the cooperation action of the separation roller 54a and the separation pressing piece 54b which presses the separation roller 54a. The separated document is transported to the reading position by the document transport roller 55a and the document transport roller 55b pressed against it. Reference numeral 56 denotes a sensor lever, which acts as an actuator of a sensor (not shown) that detects the front and rear edges of the document. 57 is a contact sensor,
The document image nipped and conveyed by 55a and the document conveyance roller 55b is read. The document from which the image has been read is fed to the document discharge roller 58a and the document discharge roller 58b pressed against it.
And is discharged to a document discharge tray (not shown).

In the above construction, the preliminary conveying roller 53a has an elliptical shape, and the state in which its elliptical direction is parallel to the original conveying direction is the standby position. Around the rotation shaft 59 of the preliminary conveyance roller 53, protrusions are made at positions different by 180 °.
59a are projected respectively. In addition, the above-mentioned preliminary conveyance roller
A sensor 60 is installed near the
The rotation angle of the preliminary conveyance roller 53a is detected by the presence or absence of contact with any one of the protrusions 59a. The stepping motor (not shown), which is a drive source, is stopped by the detection signal of the sensor 60 to stop the preliminary conveyance roller 53a at a regular stop angle to maintain the standby position.

[0004]

However, in the above-mentioned prior art, since the stop angle of the pre-conveyance roller 53a is detected by using an electric component called the dedicated sensor 60, it is necessary to design the wiring, the board and the like. Therefore, the cost of parts increases. Further, software for controlling the rotation speed of the stepping motor is also required by the output from the sensor 60, so that it is necessary to design it, which increases manufacturing cost and design load.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a sheet conveying apparatus which maintains a standby position of a rotating body for separating and feeding out a sheet, thereby reducing manufacturing cost and design load. It is in.

[0006]

The typical means of the present invention which solves the above-mentioned problems of the prior art and is applied to the embodiments described below is a sheet conveying apparatus for sequentially conveying a plurality of sheets from a set position. A rotary member having a partially non-circular shape for separating and sequentially feeding out a plurality of sheets, and a detection unit for detecting a sheet end arranged downstream of the rotary member in the sheet conveying direction, It is characterized in that the stop angle is controlled by calculating the number of rotations of the rotating body in accordance with the sheet edge position detected by the detecting means from the time when the rotating body starts rotating until the rotation is stopped.

[0007]

According to the above-mentioned means, in accordance with the sheet end position detected by the detecting means arranged on the downstream side of the rotating body in the sheet conveying direction from the time when the rotating body starts to rotate until the rotation stops. The rotation speed of the rotating body is calculated to control the stop angle of the rotating body. Further, the non-circular portion of the non-circular rotating body is arranged so that the biasing means contacts the cut surface of the rotation shaft at the standby position where the non-circular portion is substantially parallel to the sheet conveying direction, and the biasing means rotates. By biasing the rotation shaft so as to correct the deviation of the stop angle of the body, the error of the stop angle can be absorbed and the rotating body can be stopped at the regular standby position.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording apparatus according to the present invention will be described with reference to the drawings. In this embodiment, a sheet conveying device provided in a facsimile machine will be described. Figure 1
2 is an explanatory view showing a schematic configuration of a facsimile device, FIG. 2 is a perspective explanatory view showing an external configuration of the facsimile device, FIG. 3 is a sectional explanatory view showing a configuration of a reading device, and FIG. 4 is a configuration of a drive system of the reading device. FIG.

(Overall structure)

First, a schematic structure of a facsimile apparatus will be described with reference to FIGS. The facsimile apparatus is equipped with a document reading section A for reading a document image and a recording section B for recording on a recording sheet according to image information.

First, the structure of the document reading unit A will be described. In FIGS. 1 and 2, reference numeral 1 is a document placing table on which the document is placed with the image side facing down. A document placed on the document table 1 is positioned by a slider 1a movable in the width direction. Reference numeral 2 denotes a pre-conveying roller, which cooperates with the pre-conveying pressing piece 26 to separate the front end of the document bundle and pre-convey it to the downstream side. A separation roller 3a cooperates with a separation pressing piece 3b that presses the separation roller 3a to separate and convey the pre-conveyed originals one by one. 4a and 4b are original conveying rollers,
A document transport roller that transports the separated and transported document to the reading position. Reference numeral 5 denotes a contact type sensor, which is a document feeding roller 4
The document image nipped and conveyed by a and the document conveyance roller 4b is read. Reference numerals 6a and 6b denote document discharge rollers and document discharge rollers, which convey the document after image reading and discharge it to a document discharge tray 7 formed on the upper surface of the apparatus. Further, an operation panel C provided with a numeric keypad and various function keys is provided on the upper surface of the document reading section A.

Next, the structure of the recording section B will be described.
In FIG. 1, reference numeral 8 is a cassette capable of stacking and storing a plurality of recording sheets P. The cassette 8 is detachably attached to the lower part of the device. The cassette 8 is equipped with a middle plate 8b for loading the recording sheets P in a housing-like main body case 8a for storing the recording sheets P. The intermediate plate 8b is urged upward from the back surface by a pressure spring 8c arranged to face a feeding roller 9 which will be described later. 8d is a separation claw,
The leading end of the recording sheet P is locked. Reference numeral 8e is a trailing edge regulating plate that regulates the trailing edge position in the length direction of the recording sheets P stacked on the middle plate 8b. Reference numeral 8f is a side regulating plate that regulates the widthwise side end position of the recording sheets P stacked on the middle plate 8b.
A cassette lid 8g constitutes a part of the recording sheet discharge tray as described later.

Reference numeral 9 denotes a feeding roller, which separates and feeds only the uppermost one of the recording sheets P stacked and stored in the cassette 8 in cooperation with the separating claw 8d. The feeding roller 9 has a half-moon shape, and has an arcuate surface 9a that comes into contact with the recording sheet P and feeds it, and a flat surface portion 9b that opposes the recording sheet P at a predetermined interval. In the feeding standby state, the flat surface portion 9b is opposed to the recording sheet P. Further, at the time of feeding, the recording sheet P is fed out by rotating once by one rotation spring clutch or the like (not shown).

Reference numeral 10 denotes a conveying roller, which is the feeding roller 9 described above.
The recording sheet P separated and fed by is conveyed so as to be wound. Around the transport roller 10, transport rollers 11,
12 is pressed, and the recording sheet P is conveyed to the recording means described later while being pinched so as to be sufficiently wrapped around the conveying roller 10. A reversing guide 13 guides the recording sheet P to be reversed and conveyed by a guide surface having a curvature larger than the conveying roller 10 by a predetermined amount. The reversing guide 13 is attached to the main body of the apparatus so as to be openable and closable.

D is a recording means for recording an ink image on the recording sheet P conveyed by the conveying roller 10. As a recording means in this apparatus, an inkjet recording method is used in which ink is ejected from a recording head to perform recording. That is, this recording head has a fine liquid discharge port (orifice), a liquid passage and an energy acting portion provided in a part of this liquid passage, and energy generation for generating droplet forming energy for acting on the liquid in the acting portion. Equipped with means.

As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, electromagnetic waves such as a laser are radiated to generate heat, and droplets are ejected by the action of the heat generation. There are a recording method using an energy generating means, a recording method using an energy generating means for heating a liquid and discharging the liquid by an electrothermal converter such as a heating element having a heating resistor.

Among them, a recording head used in an ink jet recording method for ejecting a liquid by thermal energy has a high density of liquid ejection ports (orifices) for ejecting recording liquid droplets to form ejection liquid droplets. Since they can be arranged, high resolution recording is possible. Among them, the recording head using the electrothermal converter as the energy generating means can easily be made compact, and has the advantages of the IC technology and the microfabrication technology, which have been remarkably improved in technology and reliability in the recent semiconductor field. This is advantageous because it can be used in two parts, high-density mounting is easy, and the manufacturing cost is low.

In this embodiment, the recording head (recording density 36
Disposable type ink jet cartridge that integrates 64 nozzles at 0 dpi) and an ink tank
14 is used, and the inkjet cartridge 14
Are mounted on the carriage 15 and run in the width direction of the recording sheet P to perform recording. Reference numeral 16 denotes a platen plate, which is provided so as to face the ink jet cartridge 14,
The recording sheet P is supported from the back side at the recording position.

Reference numeral 17 denotes a platen roller, which is arranged upstream of the platen plate 16 in the sheet conveying direction and has a recording sheet P.
Are transported onto the platen plate 16. Reference numeral 18 denotes a pressing roller that presses the platen roller 17 and follows it. Reference numerals 19 and 20 denote upper and lower guide plates, which guide the recording sheet P conveyed by the conveying roller 10 between the platen roller 17 and the pressing roller 18. twenty one
Numerals a and 21b are feed rollers and spurs, which are arranged on the downstream side of the platen plate 16 in the sheet conveying direction, and convey the recording sheet P after the recording on the conveying guide 22 to the downstream side. 23a, 23b
Is a discharge roller or spur, and discharges the recording sheet P conveyed by the feed roller 21 to the recording sheet discharge tray 24. The spurs 21b and 23b are made of a material to which ink is not transferred even if they come into contact with the recording surface of the recording sheet P. The recording sheet discharge tray 24 is composed of a frame of the apparatus main body, and a plurality of discharge ribs 24b are formed on the stacking surface. Further, a cassette lid 8g of the cassette 8 is arranged continuously on the recording sheet discharge tray 24, and these form a stacking surface of recording sheets P. Reference numeral 42 denotes an openable / closable cover, which forms a space necessary for replacing the ink jet cartridge 14 in the opened state, and the upper and lower guide plates 19 and 20 and the transport guide.
The space above 22 is also open.

(Structure of detection means)

In FIG. 3, reference numeral 25 denotes a DS actuator, which is rotatably attached so that its tip portion projects into the document conveying path. The DS actuator 25 rotates when a document is inserted, and the presence or absence of the document is detected by a DS sensor (not shown).

27a is a DES actuator,
The leading end portion is rotatably attached to the downstream side of the document transport roller 4a and the document transport roller 4b so that the leading end projects into the document transport path. The DES actuator 27a rotates when an original is conveyed by the original conveying roller 4a and the original conveying roller 4b, and the leading edge and the rear edge of the original are detected by the DES sensor 27b shown in FIG. The operation of the drive source is controlled by the control unit (CPU) 44 shown in FIG. 1 by the detection signals of the DS sensor and the DES sensor 27b.

(Structure of drive system)

Next, the structure of the drive system of the reading device will be described with reference to FIG. In FIG. 4, 28 is a stepping motor which is a drive source, and a pinion gear 29 (the number of teeth is 17) is attached to this rotating shaft. A spur gear 30 (67 teeth / 35 teeth) meshes with the pinion gear 29. The spur gear 31 is attached to the shafts of the document conveying roller 4a and the document discharge roller 6a, respectively.
(67 teeth / 20 teeth) are engaged with each other, and drive the document feeding roller 4a and the document discharging roller 6a, respectively.

The spur gear 31 (the number of teeth is 67 / the number of teeth is 20) attached to the shaft of the document conveying roller 4a is meshed with the spur gear 33 (the number of teeth is 68) attached to one end of the ADF transmission shaft 32. ing. The ADF transmission shaft 32 is for transmitting a driving force to the pre-transport roller 2 and the separation roller 3a as described later. The spur gear 34 is provided at the other end of the ADF transmission shaft 32.
(18 teeth) is attached. This spur gear 34 is a separation roller 3 to which a one-way spring clutch 35 is attached.
The spur gear 36 attached to the rotary shaft 37 in which a is fitted.
It meshes with (18 teeth). The rotating shaft 37 has a spur gear.
38 (the number of teeth is 12), and the spur gear 38 is a spur gear 39.
Each of them meshes with a spur gear 41 (having 12 teeth) attached to the rotary shaft 40 of the pre-transport roller 2 via (having 17 teeth).

(Reading operation)

Explaining the reading operation of the above-mentioned reading device, when one or more originals are set on the original stacking table 1, the DS sensor (not shown) detects the presence or absence of the original by the rotational movement of the DS actuator 25. The stepping motor 28, which is a drive source, rotates by a predetermined amount, the document is nipped by the preliminary conveyance roller 3 and the preliminary conveyance pressing piece 26, and the leading end is separated.

When the user presses the start button on the operation panel C in both transmission and copying, the stepping motor 28, which is a drive source, is driven, and the pre-conveyance is rotated through the gear train described above. The original is further clamped by the roller 2 and the preliminary conveyance pressing piece 26, and the leading end is separated,
The separation roller 3a and the separation pressing piece 3b are conveyed to the separation unit.

Next, a plurality of originals are separated one by one by the separating roller 3a and the separating pressing piece 3b which are rotated by the driving force transmitted by the stepping motor 28, and are sandwiched by the original conveying roller 4a and the original conveying roller 4b. Be transported. At this time, the leading edge of the document is detected by the DES sensor 27b by the rotational movement of the DES actuator 27a.

Next, the original is conveyed to the reading position and the image is read by the contact sensor 5. When the trailing edge of the document is detected by the DES sensor 27b, the document discharge roller 6 driven by the stepping motor 28.
a is rotated by a predetermined amount from the detection signal of the DES sensor 27b, and the document is fed by the document discharge roller 6a and the document discharge roller 6b.
The sheet is sandwiched and conveyed by the sheet to be discharged and stacked on the document discharge tray 7.

(Control of Stop Angle of Preliminary Conveying Roller)

The preliminary conveying roller 2 has a shape close to an ellipse for the purpose of separating the leading edge of the original. In consideration of the settability at the time of setting the original, the preliminary conveyance roller 2 is on standby so that the stop angle is θ = 5 ° with respect to the sheet conveyance direction, and is rotated by a predetermined amount after the reading operation of the original is completed. It is necessary to control the rotation so as to return to the standby position (see FIG. 3). Hereinafter, the conditions necessary for controlling the stop angle of the preliminary conveyance roller 2 will be described.

In the present embodiment, the stepping motor 28 employs a so-called 1-2 phase excitation method, so that the rotation angle per step of the stepping motor 28 is 3.75 [° / step] = π / 48 [ rad / ste
p].

First, when the last document set previously is being conveyed, the separation rollers 3a and the document conveyance rollers 4a have conveyance speeds (roller peripheral speeds) which are the same as the speed reduction ratio by the gear train of the drive system and the separation roller 3a. And the diameter of the document conveying roller 4a The diameter of the separating roller 3a: φ25 mm The diameter of the document conveying roller 4a: φ14.23 mm From this, the peripheral speed of each roller is the conveying speed of the separating roller 3a: 25/2 × π / 48 × 17 / 63 x 35/67 x 20 /
68 × 18/18 = 625π / 57888 [mm / st
ep] Transport speed of the document transport roller 4a: 14.23 / 2 × π / 48 × 17/63 × 35/67 = 24191π / 1157760 [mm / step], and the transport speed of the separation roller 3a <document transport When the original is in contact with both the separation roller 3a and the original conveyance roller 4a because of the conveyance speed of the roller 4a, the separation roller 3a does not reach the predetermined conveyance speed due to the frictional force with the original, and the original conveyance roller 4a. The one-way spring clutch 35 interrupts the power transmission from the stepping motor 28, and at the same time, the driving force is not transmitted to the preliminary conveyance roller 2. Further, at this time, even if the preliminary conveying roller 2 is protruding from the sheet passing surface, the preliminary conveying roller 2 is rotated by the frictional force with the original, and becomes the regular standby position.

Therefore, since the trailing edge of the last original document starts to rotate from the normal standby position after the trailing edge of the last document leaves the separating roller 3a, the movement of the preliminary feeding roller 2 moves to the trailing edge of the last document. The position can be classified as follows. (1) Until the last trailing edge of the original leaves the separation roller 3a and then leaves the original feeding roller 4a (2) Until the last trailing edge of the original leaves the original feeding roller 4a and until the DES sensor 27b turns off (3) Until the last trailing edge of the original leaves the original discharge roller 6a after the DES sensor 27b is turned off

Among the step numbers more than the total step number of the stepping motor 28 required for each of these states, the minimum step number at which the preliminary conveying roller 2 becomes the regular stop angle may be obtained. Above classification (1)
In (3), it is the document feeding roller 4a in the classifications (1) and (2) that determines the transportation speed of the last document in the classification (1) and (2) due to the balance of the pressing force against the rollers, and in the classification (3) The discharge roller 6a.

The transport speed (roller peripheral speed) of the document discharge roller 6a is the speed reduction ratio and the diameter of the drive diameter of the gear train. The diameter of the document discharge roller 6a is φ14.27 mm, and the transport speed of the document discharge roller 6a is: .27 / 2 × π / 48 × 17/63 × 35/67 = 24259π / 1157760 [mm / sec].

Further, the document conveyance distance in the above classifications (1) to (3) is (1): 16.06 mm (2): 8.57 mm (3): 34.43 mm. Here, in order to ensure that the document is ejected,
In the classification (3), it is assumed that the transportation is further 20 mm, and when calculated with 54.34 mm, the classification (1) to (3)
In the above, the number of steps of the stepping motor 28 required to convey the document is (1): 16.06 / (24191π / 115776
0) ≈245 [step] (2): 8.57 / (24259π / 1157760)
≈131 [step] (3): 54.43 / (24259π / 115776
0) ≈ 828 [step], and the total number of steps is 245 + 131 + 828 = 1204 [step], and the preliminary conveyance roller 2 rotates by the number 1204 [step] during the classification (1) to (3). Will be.

Here, considering the reduction ratio of the above-mentioned gear example of the drive system, the rotation angle of one step of the stepping motor 28 is π / 48 × 17/63 × 35/67. × 20/68 × 18
/ 18 × 12/17 × 17/12 = 25π / 28944
[Rad / step]. That is, π / (25π / 28944) ≈1158 [step] is required to rotate the preliminary conveyance roller 2 from the regular stop angle to the 180 ° which is the minimum rotation angle required to return to the regular stop angle again. Therefore, the above 1204 [step] is 180
Since it rotates more than 1 °, in order to reach the regular stop angle, 1158 × 2-1204 = 1112 [step] after 1204 steps, the preliminary conveyance roller 2 is stopped at the regular stop angle shown in FIG. be able to.

From the above, after the DES sensor 27b is turned off, it is sufficient to rotate the preliminary conveying roller 2 by 828 + 1112 = 1940 [steps],
In this embodiment, this number of steps is adopted. The control of the number of steps of the stepping motor 28 is performed by the CPU 44 as shown in FIG.

According to the above construction, the stop angle of the pre-transport roller 2 can be optimized without providing a dedicated sensor for detecting the rotation angle of the pre-transport roller 2 which has been conventionally used. The load of can be reduced.

Further, as shown in FIG.
The cut surface 40a facing the rotary shaft 40 is provided in parallel, and the rotary shaft 40 is arranged so that the cut surface 40a is vertical when the preliminary conveyance roller 2 is at the normal stop angle. When the cut surface 40a is vertical, the cut surface 40a is
And the cut surface 40a is not vertical, the rotary shaft 40
A leaf spring 43 is provided so as to urge the sheet feeding means, and when the preliminary transport roller 2 rotates 180 × n ° (n ≧ 0) from the standby position, the leaf spring 43 corrects the deviation of the stop angle. As a result, an error due to gear backlash or the like can be absorbed, and the preliminary transport roller 2 can be reliably stopped at the regular standby position, and the reliability of the apparatus can be improved.

Further, as shown in FIG.
Even if the cut surface 40a of the rotary shaft 40 is not vertical when the auxiliary transport roller 2 is not in the standby position, the flat spring 43 contacts the cut surface 40a and the rotary shaft 40 is not in the standby position.
It is also possible to provide the leaf spring 43 so as to bias the.

Further, although the elliptical pre-conveying roller 2 is used as the rotating body in the above-mentioned embodiment, it is not limited to this, and if it has a non-circular shape, it is a semi-circle or a quadrangle. It may be shaped like.

In the above-mentioned embodiment, the ink jet recording system is used as the recording means, but the electrothermal converter is energized according to the recording signal, and the thermal energy applied by the electrothermal converter produces ink. More preferably, recording is performed by ejecting the ink from the ejection port due to the growth and contraction of bubbles generated in the ink by utilizing the film boiling.

With regard to its typical structure and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4740796. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal transducer, which corresponds to the recorded information and gives a rapid temperature rise beyond nucleate boiling,
This is effective because heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, and as a result, bubbles in the liquid can be formed in a one-to-one correspondence with this drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection openings to form at least one droplet. It is more preferable to make this drive signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, so that particularly excellent liquid ejection can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise on the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the linear liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. Nos. 4,558,333 and 4,459,600, which disclose configurations in which the heat acting portion is arranged in a bending region.

Further, JP-A-59-123670 which discloses a structure in which a common slit is used as a discharge portion of the electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy are disclosed. Japanese Patent Laid-Open Publication No.
The effect of the present invention is effective even if the configuration is based on Japanese Patent Laid-Open No. 59-138461. That is, according to the present invention, recording can be surely and efficiently performed regardless of the form of the recording head.

Further, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium which can be recorded by the recording section. As such a recording head, by combining a plurality of recording heads,
Either a structure satisfying the length or a structure as one recording head integrally formed may be used.

In addition, even in the case of the serial type described above, it is possible to electrically connect to the apparatus main body and supply ink from the apparatus main body by mounting the recording head fixed to the carriage or the carriage. A replaceable chip type recording head or the like may be used.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as the structure of the recording section of the present invention, because the effects of the present invention can be further stabilized. Specifically, these are capping means, cleaning means, pressurizing or suctioning means for the recording head, preheating means by electrothermal conversion type or other heating element or a combination thereof, and recording. It is also effective to perform a stable recording by performing a preliminary discharge mode in which another discharge is performed.

Regarding the type and number of recording heads mounted on the carriage, for example, only one recording head is provided corresponding to a single color ink, or a plurality of inks having different recording colors and densities are supported. And a plurality of them may be provided. That is, for example, the recording mode of the recording unit is not limited to the recording mode of only the mainstream color such as black, but may be a combination of a plurality of recording heads integrally formed, but a mixed color of different colors or a mixed color It is also applicable to a device with at least one of the full colors according to

In addition, in the above-mentioned embodiments, the ink is explained as a liquid, but it is an ink which solidifies at room temperature or lower and softens or liquefies at room temperature, or in the ink jet recording system. 30 inks
Generally, the temperature is controlled in the range of ℃ to 70 ℃ to control the temperature of the ink so that the viscosity of the ink is within the stable ejection range. good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from the solid state to the liquid state, or to use ink that solidifies when left standing for the purpose of preventing ink evaporation. However, in any case, when heat ink is liquefied by applying heat energy according to the recording signal and liquid ink is ejected, or when the ink reaches the recording sheet, it begins to solidify. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is described in JP-A-54-5.
As described in Japanese Patent No. 6847 or Japanese Patent Laid-Open No. 60-71260, a mode in which it is opposed to the electrothermal converter in a state of being held as a liquid or a solid in the concave portion or through hole of the porous sheet. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as a form of the above-mentioned reading device,
The present invention is not limited to a facsimile machine, but may be a copying machine or the like.

Further, although an example in which the ink jet recording system is used as the above-mentioned recording means has been described, the present invention need not be limited to the ink jet recording system, and other thermal transfer recording system and thermal recording system, and further, Can also be applied to a recording method other than the impact recording method such as the wire dot recording method. Further, it is not necessary to limit to the serial recording method, and a so-called line recording method may be used.

[0058]

As described above, the present invention makes it possible to optimize the stop angle of the rotating body (preliminary transport roller) without using a dedicated sensor for detecting the rotating angle of the rotating body (preliminary conveying roller). Therefore, the manufacturing cost and the design load can be reduced.

Further, when the rotating body (preliminary conveying roller) is at the regular stop angle, by providing a biasing means for contacting parallel cut faces formed on the rotating shaft of the rotating body, the gear backlash is provided. Absorb the error due to etc.,
The rotating body can be reliably stopped at the regular standby position, and the reliability of the device can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a facsimile apparatus.

FIG. 2 is a perspective explanatory view showing an external configuration of a facsimile apparatus.

FIG. 3 is an explanatory cross-sectional view showing the configuration of a reading device.

FIG. 4 is an explanatory diagram showing a configuration of a drive system of a reading device.

FIG. 5 is an explanatory diagram of a reading device according to another example.

FIG. 6 is an explanatory diagram showing a configuration of a conventional reading device.

[Explanation of reference numerals] A ... Original reading unit B ... Recording unit C ... Operation panel D ... Recording unit 1 ... Original placing table 1a ... Slider 2 ... Preliminary transport roller 3a ... Separation roller 3b ... Separation pressing piece 4a ... Original transport roller 4b Document transport roller 5 Contact sensor 6a Document discharge roller 6b Document discharge roller 7 Document discharge tray 8 Cassette 8a Main unit case 8b Middle plate 8c Pressing spring 8d Separation claw 8e Rear end regulating plate 8f ... Side regulating plate 8g ... Cassette lid 9 ... Feed roller 9a ... Arc surface 9b ... Flat portion 10 ... Conveying roller 10a ... Rubber portion 10b ... Core metal portion 11, 12 ... Conveying roller 13 ... Reversing guide 14 ... Inkjet cartridge 15 ... Carriage 16 ... Platen plate 17 ... Platen roller 18 ... Pressing rollers 19, 20 ... Guide plate 21a ... Feed rollers 21b, 23b ... Spur 22 ... Transport guide 23a ... Ejection roller 24 ... Recording sheet Output tray 25 ... DS actuator 26 ... Preliminary transport pressing piece 27a ... DES actuator 27b ... DES sensor 28 ... Stepping motor 29 ... Pinion gear 30, 31, 33, 34, 36, 38, 39, 41 ... Spur gear 32 ... ADF transmission Axis 35 ... One-way spring clutch 37, 40 ... Rotation axis 42 ... Cover 43 ... Leaf spring 44 ... CPU

 ─────────────────────────────────────────────────── (72) Inventor Akio Okubo 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Atsushi Saito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Noriyuki Aoki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Keizo Sasai 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. A sheet conveying device for sequentially conveying a plurality of sheets from a set position, a partially non-circular rotating body for separating and sequentially feeding out a plurality of sheets, and a downstream side of the rotating body in a sheet conveying direction. A detecting means for detecting a sheet end arranged on the side, and the rotating body according to a sheet end position detected by the detecting means between the start of rotation of the rotating body and the stop of the rotation. A sheet conveying device, wherein the rotation angle of the sheet is calculated to control the stop angle. 2. The rotating shaft of the rotating body has parallel cut surfaces facing each other, and in a standby position where the non-circular portion of the partially non-circular rotating body is substantially parallel to the sheet conveying direction. The urging means is arranged so as to come into contact with the cut surface of the rotating shaft, and the rotating body is 180 × n ° (n ≧) from the standby position.
0) The sheet conveying apparatus according to claim 1, wherein the biasing means biases the rotation shaft so as to correct the deviation of the stop angle of the rotating body when rotating. 3. A reading device, comprising: the sheet conveying device according to claim 1; and a reading unit that reads an image of a sheet fed by the sheet conveying device.