JPH07237789A - Automatic original document feeding device - Google Patents

Abstract

PURPOSE:To improve the stop precision of an original document by driving a stepping motor before the original document transfer by the pulse quantity corresponding to the backlash ranging from the stepping motor to a transfer means and the pulse quantity necessary for the phase adjustment of the stepping motor. CONSTITUTION:A pick-up roller 65 and an assorting roller 75 of an automatic original document feeding device are revolved in the paper feed, and the original documents on an original document tray 61 are allowed to pass between the assorting roller 75 and an assorting pad 80, one by one from the lowest layer side, and sent to a register roller 90, which revolves after a certain time, and then the original document is transferred to an original document board glass side. In this case, a stepping motor for driving the resist roller 90 is driven by the pulse quantity corresponding to the backlash ranging from the stepping motor to the register roller 90 and the pulse quantity necessary for the phase adjustment of the stepping motor, before the original document transfer, and the generation of phase deflection, backlash, etc., can be eliminated before the original document transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic document feeder which is installed on a platen glass of a copying machine body and automatically conveys a document to an exposure position on the platen glass.

[0002]

2. Description of the Related Art Conventionally, documents placed on a document table glass of a copying machine body are conveyed one by one to an exposure position on the document table glass, and after the exposure is completed, the document table is placed on the document table glass. 2. Description of the Related Art There is known an automatic document feeder that discharges a document onto a paper discharge tray. Further, there is one in which a stepping motor is used as a document conveying drive source of an automatic document feeder and a document is conveyed according to the number of pulses applied to the stepping motor.

[0003]

However, for example, when driving a two-phase excitation type stepping motor, it is unclear which of the excitation patterns the rotor of the motor is synchronized with, especially in the power source before the start of driving. Immediately after loading, or when the conveyance belt etc. is rotated by the operator's hand due to the jam processing of the document, it is unknown, depending on the synchronized excitation pattern, the rotor of the started stepping motor once rotates backward, After that, it may move to the forward rotation operation. That is, there is a deviation between the number of pulses given and the number of pulses actually rotating the stepping motor.

Further, due to backlash of the drive system, the amount of rotation of the document conveying means driven by the stepping motor deviates from the amount of rotation of the stepping motor.

Then, due to the reverse rotation of the stepping motor, backlash, etc., the original stop position on the original platen glass changes every time, and there is a problem that the image copied on the copy sheet is displaced. Therefore, an object of the present invention is to provide an automatic document feeder that can always stop a document at a fixed position on the platen glass without changing due to the position of the rotor of the stepping motor or backlash. To do.

[0006]

SUMMARY OF THE INVENTION The present invention has been accomplished in accordance with the above-mentioned object, and is a paper feeding unit for feeding originals one by one to an automatic document feeder and a copying machine for the fed originals. Transporting means for transporting to the exposure position, drive transmitting means for transmitting driving force to the transporting means, stepping motor for giving driving force to the drive transmitting means, and pulse corresponding to backlash from the stepping motor to the transporting means. The number of pulses required for phase adjustment of the stepping motor and the control means for driving the stepping motor before the document is conveyed.

[0007]

According to the above invention, before the document is conveyed by the automatic document feeder, the number of pulses corresponding to the backlash from the stepping motor to the conveying means and the number of pulses required for the phase adjustment of the stepping motor. Since a drive pulse is applied to the device to operate, the document is then transported based on the driving of the stepping motor, and the document is transported by the number corresponding to the number of drive pulses.
The document can be always conveyed to a predetermined position on the platen glass and stopped.

[0009]

【Example】

<< Overall Configuration and Operation of Copying Machine >> FIG. 1 shows the overall configuration of the copying machine. A photoconductor drum 10 having a photoconductor layer on its outer peripheral portion is provided at a substantially central portion of the main body 1 of the copy machine. It is installed so as to be rotationally driven at a constant peripheral velocity v in the direction of arrow a. Around the photosensitive drum 10, along the rotation direction thereof, a main eraser 11, a charging charger 12, a sub-eraser 13, a magnetic brush type developing device 14, a transfer charger 15, a sheet separating charger 16, and a blade type cleaner 17 are provided. It is arranged. An optical system 20 is arranged above the photoconductor drum 10.

The photosensitive drum 10 rotates in the direction of the arrow a, and the main eraser 11, the charging charger 12 and the sub-eraser 13 remove the charge, charge and charge between images.
The image edge is erased, and the image of the original set on the original glass 29 is exposed by the optical system 20. The electrostatic latent image formed on the photosensitive drum 10 by the exposure is visualized by the developing device 14 as a toner image.

The optical system 20 is arranged immediately below the original platen glass 29, and one end thereof is an exposure reference, that is, a reference position SP.
The original image set in accordance with is illuminated while being scanned, and the reflected light is exposed on the photosensitive drum 10.
During this image scanning, the exposure lamp 21 and the first mirror 22
And, move in the direction of arrow b at a speed of v / m (m: copy magnification) with respect to the peripheral speed v of the photosensitive drum 10 (constant regardless of equal magnification or variable magnification). At the same time, the second mirror 23 and the third mirror 24 move in the direction of arrow b at a speed of v / 2m.
When the copy magnification is changed, the projection lens 25 moves on the optical axis and the fourth mirror 26 swings or rotates to correct the optical path length.

A copy sheet, that is, a copy sheet, has an elevator type paper feed section 31 on the upper stage and a tray type paper feed section 3 on the lower stage.
It is accommodated in No. 4 and is fed one by one from any one of them according to the operator's selection. Each paper feed unit 31, 34
Paper feed rollers 32 and 35, and separation rollers 33 and 36 including a forward rotation roller and a reverse rotation roller are installed therein. The sheet fed from the upper sheet feeding section 31 is conveyed by the conveying rollers 37b, 3b.
It is sent out to the timing roller 38 installed immediately before the image transfer section through 7c. The sheet fed from the lower sheet feeding section 34 is sent out to the timing roller 38 through the transport rollers 37a, 37b, 37c.

In this copying machine, manual paper feeding is possible, and copy paper inserted from the manual paper feeding port 40 is fed by a paper feeding roller 41.
To the timing roller 38. The sheet fed to the timing roller 38 once stands by here, and is fed to the transfer section by turning on the timing roller 38 in synchronization with the image formed on the photosensitive drum 10. The paper is in close contact with the photoconductor drum 10 at the transfer portion, and the toner image is transferred by the corona discharge from the transfer charger 15, and is separated from the photoconductor drum 10 by the AC corona discharge from the separation charger 16 and the stiffness of the paper itself. To be done. After that, the paper is conveyed on the conveyor belt
The toner is fixed by being sent to the fixing device 43 through 2 and is discharged onto the paper discharge tray 46 through the transport roller 44 and the discharge roller 45. On the other hand, the photoconductor drum 10 continues to rotate in the direction of the arrow a after the transfer, the cleaner 17 removes the residual toner, and the main eraser 11 erases the residual charge to prepare for the next copy process.

In the main body 1 of the copying machine, there are installed a sheet refeeding unit 50 and sheet passing path switching claws 47 and 48 for processing double-sided / composite copying. The switching claw 47 is normally set to the solid line position and guides the paper to the paper discharge tray 46. During double-sided copying or composite copying, the paper on which the image of the odd-numbered original is transferred on the first surface (front surface) is set at a position where the switching claw 47 is slightly rotated counterclockwise, Conveying rollers 51a, 51b, 51
It is discharged to the intermediate tray 52 through the c and 51d, and is accommodated with the image surface facing upward. When a refeed signal is generated after a predetermined number of sheets of paper are stored on the intermediate tray 52,
The sheets are fed one by one to the conveying roller 37c from the lowermost one by the rotation of the re-feeding belt 53 and the separating roller 54.

In the double-sided copy mode, the re-fed paper is sent out to the timing roller 38 while being guided upward by the switching claw 48 set to the solid line position, and is then transferred to the second surface (back surface). The image is transferred, fixed, and discharged onto the paper discharge tray 46. On the other hand, in the composite copy mode, the re-fed paper is conveyed in the direction of arrow c by the conveyance roller 37d by setting the switching claw 48 to a position slightly rotated clockwise. Immediately before the trailing edge of the sheet exits the nip portion of the transport roller 37d, the transport roller 37d is switched to the reverse rotation, whereby the sheet is sent out to the timing roller 38 in a state where the front and back and front and back are reversed. After that, the images are transferred and fixed on the first surface (front surface) in an overlapping manner, and are discharged onto the paper discharge tray 46.

By the way, in the copying machine main body 1, the copying process is started, and the first sheet is the timing roller 3.
When waiting immediately before 8, the first-out paper feed process is performed in which the second and subsequent sheets are also fed in advance to the paper feed path. For example, in the paper feeding from the lower paper feeding unit 34, the second paper is fed to the paper feeding passage subsequent to the first paper, and the third paper is immediately before the transport roller 37a. Is fed. Such advance feeding processing is performed not only in the multi-copy mode but also in the single copy mode using the ADF 60 to improve the copy speed.

<< Configuration and Operation of ADF >> The configuration and operation of the ADF 60 will be described in detail. First, referring to FIG. 2, the ADF
The schematic configuration and operation of the 60 will be described in detail. ADF60 is
In general, it is composed of a document feeding unit 601, a document transporting unit 602, and a document discharging unit 603. The document feeding unit 601 is
Document tray 61, leading edge regulation plate 63, pickup roller 65, document pressing plate 70, separation roller 75, separation pad 8
0 and a registration roller 90, and parts other than the document tray 61 are covered with an openable / closable cover 604. The document transport unit 602 includes a drive roller 96 disposed near the document feed unit 601, a driven roller 97 disposed near the document discharge unit 603, and a transport belt 95, which are configured to move the document tray 61. It is covered with a constituting cover 605. The document discharge unit 603 includes a reversing roller 100, a discharge roller 110, and a paper discharge tray 115, and components other than the paper discharge tray 115 are covered with an openable / closable cover 606.

The ADF 60 is installed on the upper surface of the copying machine main body 1 so that the conveyor belt 95 is located on the original platen glass 29, and the original platen glass 29 is provided by a hinge metal fitting (not shown) provided on the back side, that is, the side opposite to the operating side. Can be opened to the upper surface of.

When the operator manually sets a document on the platen glass 29, the ADF 60 is lifted upward to open the upper surface of the platen glass 29. ADF60
1 is detected by the magnet sensor SE100 shown in FIG. 1, and the operation of the ADF 60 becomes possible only when the sensor SE100 detects that the ADF 60 is properly closed.

The originals to be fed are stacked on the original tray 61 with the first page facing upward. At this time, the position of the document is regulated in the width direction by the side regulating plate 62, and the position of the leading edge is regulated by the leading edge regulating plate 63. Tip regulation plate 6
3 and the pressing plate 70 are rotatable about the support shafts 64 and 71, respectively. The leading edge regulation plate 63 is retracted downward from the time of feeding the first document to the completion of feeding of the final document at the time of feeding. When the first original is fed, the pressing plate 70 moves downward from the retracted position shown in FIG. 2 and presses the leading end of the original against the pickup roller 65 to apply the feeding pressure.

Pickup roller 65, separation roller 75
Are driven to rotate in the clockwise direction during paper feeding. The originals pass through between the separating roller 75 and the separating pad 80 one by one from the lowest layer and are sent to the registration roller 90. The registration roller 90 temporarily holds the fed document at the nip portion thereof, and is rotated after a certain period of time to convey the document to the entrance portion of the document table glass 29.

The conveyor belt 95 is stretched endlessly between the driving roller 96 and the driven roller 97 so as to cover the entire surface of the original platen glass 29. Inside the transport belt 95, a large number of backup rollers 98 are rotatably installed in order to press the belt 95 against the original table glass 29. The conveyor belt 95 is driven to rotate in the direction of arrow d, and is a reference position (exposure reference) SP for starting the exposure of the document, which is the boundary between the scale 120 and the document table glass 29.
Align the leading edge of the document with and set it.

In the vicinity of the reversing roller 100, pinch rollers 101 and 102, and a switching claw 103 for the purpose of switching the paper path for reversing the original in the double-sided original mode.
Is provided. Normally, the switching claw 103 is set to the solid line position, and after the exposure is completed, the document is discharged from the document table glass 29 based on the rotation of the conveyor belt 95 in the direction of arrow d and the rotation of the reversing roller 100 in the clockwise direction. The sheet is guided upward by the guide plate 104 and the switching claw 103, and is ejected onto the sheet ejection tray 115 by the ejection roller 110. In the case of a double-sided original, since the second side (back side) is subjected to copy processing first, when the double-sided original is fed onto the original platen glass 29,
The switching claw 103 is rotated in the clockwise direction by a predetermined angle from the state shown in the figure, and first, the double-sided original is fed to the reversing roller 100.
The sheet is reversely conveyed around the sheet and is returned on the platen glass 29 with the second surface facing downward. At this time, the conveyor belt 95 is rotationally driven in the direction opposite to the arrow d. Further, after the exposure of the second side of the double-sided original, the double-sided original is reversed and conveyed around the reverse roller 100 again for the copy processing of the first side (front side).

The reverse roller 100 and the discharge roller 11
Zero is rotationally driven by the discharge motor M4 (see FIG. 65). The ADF 60 has various sensors SE for detecting a document.
1, SE2, SE3, SE10 are provided. Sensor S
E1 detects the presence / absence of a document on the tray 61. The sensor SE2 is installed immediately before the registration roller 90, detects the arrival and passage of the original document, and detects the original document from the registration roller 9
When sent from 0, the length of the document is detected in cooperation with the timer. The sensor SE10 is installed side by side with the sensor SE2 and detects the size of the document in the width direction. Based on the document detection signals from the sensors SE2 and SE10, whether the document size is vertical feed (the long side of the document is parallel to the conveyance direction),
Judgment is made including whether the paper is fed laterally (the short side is parallel to the transport direction). Further, the sensor SE3 is installed at the entrance of the reversing roller 100 and detects a document passing therethrough.

<< Explanation of Scale 120, etc. >> Scale 12
For 0, the ADF 60 is lifted and the original is placed on the original glass 29.
ADF60 is equipped with a scale for placing one end of the original according to its size when manually placing it on top.
In the above operation, the original has been conveyed on the original table glass 29 by the conveyor belt 95 and is forced to stop at the exposure reference position SP.

The scales 120 are arranged opposite to the downstream end of the original table glass 29 in the original conveying direction, and are provided on the rear side and the front side of the upper frame 2 of the copying machine body 1 as shown in FIGS. The holder 121 is rotatable about a pin 122 as a fulcrum, and is supported by a spring 123 at the front end, that is, the platen glass 29.
It is attached with the side biased upward.

The scale 120 has a projection 120a facing the upper surface frame 2 on the bottom and a document table glass 29.
Is provided with a protrusion 120b that protrudes into the lower space of the front end surface 120c. A plurality of cutouts 120e having a predetermined length are provided at the upper side corners.

As a result, as shown in FIG. 3, the ADF 6
When 0 is opened with respect to the copying machine main body 1, the scale 1
20 is the protrusion 12 based on the biasing force of the spring 123.
0b engages with the lower surface of the platen glass 29, and the position is regulated with the tip protruding from the platen glass 29 by a predetermined height. In this state, the entanglement prevention unit 120 at the tip of the scale
f is held below the upper surface of the document table glass 29. Therefore, the original placed on the original table glass 29 is accurately positioned by applying one end thereof to the scale front end surface 120c.

When the ADF 60 is closed with respect to the main body 1 of the copying machine, the projection 99a of the frame 99 supporting the rollers 96, 97 and the conveyor belt 95 is in contact with the scale 120, and the tip of the scale 120 is Conveyor belt 9
5 and is kept in a state of protruding by a predetermined height from the upper surface of the platen glass 29. At this time, the scale 120 is shown in FIG.
It is set to drop slightly from the state of. The frame 99 is kept parallel to the original table glass 29 by a positioning member (not shown). Therefore, the copying machine body 1
When the ADF 60 is attached to, the positional relationship between the tip of the scale 120 and the conveyor belt 95 supported by the frame 99, and the contact state between the both can be easily and reliably maintained in an appropriate state. As a result, the rotation adjustment of the scale 120 becomes unnecessary, and the original does not pass uncontrolled by the scale 120 due to the insufficient pressure contact force or the amount of pressure contact, and the original can be reliably regulated by the scale 120. Further, the accuracy of stopping the original when the front end of the original is brought into contact with the scale 120 is improved, and skew (diagonal feed) can be reliably corrected.

A lever 124 for rotating the scale 120
Is rotatably supported via a support shaft 125 provided on an internal frame (not shown) of the ADF 60, and one end thereof is rotatably connected to the plunger SL1a of the solenoid SL1. Then, when the solenoid SL1 is switched from the off state to the on state, the lever 124 abuts the lever abutment portion 120d, the scale 120 rotates in the clockwise direction, and the leading end of the scale is rotated as shown in FIGS. It is pushed down under the glass 29.

By adopting the above-mentioned structure, the original conveyed from the right side to the left side in the drawing on the original table glass 29 based on the movement of the conveying belt 95 in the direction of arrow d is
The end on the downstream side in the moving direction is the tip surface 1 of the scale 120.
It hits 20c and stops. Then, the copying machine body 1 starts the exposure operation. When the exposure operation is completed,
The solenoid SL1 is switched from the off state to the on state, and the lever 124 rotates in the clockwise direction in the drawing with the support shaft 125 as a fulcrum to press the lever contact portion 120d. As a result, the scale 120 is rotated in the clockwise direction in the figure about the support shaft 122, and the front end of the scale is placed on the original platen glass 2.
The document is lowered below the upper surface of 9, and the document is transported to the paper discharge side (left side) as the transport belt 95 moves.

When the rotary support shaft 122 of the scale 120 is arranged below the upper surface of the original platen glass 29, the gap m (see FIG. 6) between the scale front end surface 120c and the original platen glass 29 is lowered. Becomes smaller as In addition, the scale tip surface 120c and the platen glass 29
The angle θ formed with the upper surface (see FIG. 5) is set to be a right angle or more with respect to the document passing direction regardless of whether the scale 120 is projected from the upper surface of the platen glass or lowered. As a result, the scale 120 is placed on the platen glass 2
When the document is positioned below 9, even if the leading edge of the document is caught on the scale leading end surface 120c, the document is raised by its waist strength and the guide function of the angle θ, and the scale leading end can be easily moved. pass. Therefore, scale 12
The document is not caught in the gap between 0 and the document table glass 29, and there is no jam or damage to the leading edge of the document.

Second Embodiment of Scale Pressing Mechanism FIGS. 7 to 12 show another embodiment of the mechanism for pressing the scale 120. In this pressing mechanism, the lever 124 is composed of two lever members 124a and 124b. The connecting portion of the lever members 124a and 124b is rotatably supported by the pin 125 fixed to the internal frame 2a of the ADF 60. As shown in FIGS. 9 and 10, the pin connecting portions of the lever members 124a and 124b are provided with fan-shaped portions 124a ′ and 124b ′ having a cross section centered on the fixing pin 125, and these are opposed to each other with the fixing pin 125 interposed therebetween. , The lever pin 124a (1
24b) can rotate relative to the other lever member 124b (124a) by a predetermined angle (β). Stroke absorbing springs 127 are wound around the fan-shaped portions 124a ′ and 124b ′ in cross section, and both ends thereof are engaged with the lever members 124a and 124b, respectively, and one lever member 124a is connected to the other lever member 12
4b is urged in the clockwise direction relatively, and is restricted to the state of FIG. 9, and in the normal state, the lever member 124
a and 124b have an upper surface intersection angle of φ (see FIG. 6).
I try to do it. Further, a long hole 124c provided in the lever member 124b is connected to a plunger SL1a of a solenoid SL1 provided above via a pin SL1b. The plunger SL1a is biased upward by a spring 126 provided on the inner frame 2a of the ADF 60. The biasing force of the spring 126 is adjusted so that the lever member 124a abuts the scale 120 when the solenoid SL1 is in the OFF state, but the scale 120 is not pushed down. That is, the spring 12
The biasing force of 6,123,127 is N1, N2, N, respectively.
Assuming 3, the respective urging forces are adjusted so as to satisfy the relationship of N3>N2> N1. Therefore, even if there is a mounting error of the ADF 60 with respect to the copying machine main body 1, the lever 124 can surely contact the scale 120. Therefore, even when the solenoid SL1 is turned on and the scale 120 is pushed down by the lever 124, the lever 124 is pressed. There is no collision sound between 124 and the scale 120, and the sound of the scale 120 colliding with the ascending regulation member (belt 95 or protrusion 99a) can be absorbed by switching the solenoid SL1 to the off state.

In the scale pressing mechanism having the above structure,
When the solenoid SL1 is switched to the ON state, the lever 124 rotates clockwise, and the tip of the lever member 124a presses the scale 120 as shown in FIG. The scale 120 rotates about a support shaft 122 as a fulcrum, the scale lowering positioning protrusion 120a contacts the upper frame 2 of the copying machine main body, and the leading end of the scale 120 stops at a position slightly lower than the original glass 29. At this time, the drive stroke of the solenoid SL1 is excessive-
That is, the plunger SL1a is not completely absorbed. This stroke excess amount δ is the same as that of the copying machine body 1 and the ADF.
It is determined in consideration of the combination accuracy with 60, etc., and is always greater than zero. Further, up to this point, since the biasing force of the spring 127 is larger than the biasing force N2 of the spring 123, the upper surface intersection angle between the levers 124a and 124b remains φ.

When the plunger SL1a is further attracted from this state, the attraction force N of the solenoid SL1 at this time is increased.
4 is larger than the biasing force of the spring 127,
As shown in FIG. 5, the lever member 124a abutted on the scale 120 and regulated in position is used for the other lever member 124a.
b rotates in the clockwise direction, absorbs the excess stroke amount δ of the plunger SL1a, and the upper surface intersection angle between the lever members 124a and 124b is φ−α (α <β) when the plunger SL1a is in the final suction state. The relative angle of 124b is as shown in FIG. Therefore, the plunger SL1a is completely sucked in the ON state-that is, the plunger SL1a is not held in the incomplete suction state, so that the load in the ON state is low and the current consumption is minimized.

<< Third Embodiment of Scale Pressing Mechanism >> FIG.
Shows another embodiment of the mechanism for pressing the scale 120,
In this embodiment, the scale 120 includes a spring 123.
Is urged upwardly by the above, abuts against the belt 95, and the position is regulated in a state where the leading end surface projects from the upper surface of the document table glass 29. The lever 124 is arranged inside the ADF 60, is rotatably held around a support shaft 125 as a fulcrum, and its substantially central portion is connected to a plunger SL1a of a solenoid SL1 via a stroke absorbing spring 127. With the solenoid SL1 off, the lever 124 and the plunger S
The tip of the lever 124 abuts the scale 120 due to the moment of the self-weight of the L1a, but it is adjusted so as not to push down the scale 120. In this mechanism, when the solenoid SL1 is switched to the ON state, the plunger SL1a descends, the lever 124 rotates clockwise around the support shaft 125, and the scale descending positioning protrusion 120a abuts the upper surface frame 2, thus The tip is positioned slightly below the platen glass 29, so that the document is positioned. At this point, the plunger SL1a is not completely sucked. However, the amount of movement of the plunger SL1a thereafter is absorbed by the extension and deformation of the stroke absorbing spring 127.

<< Fourth Embodiment of Scale Pressing Mechanism >> FIG.
Shows another embodiment of the scale pressing mechanism. In this embodiment, the scale 120 is urged upward by the spring 123, abuts against the belt 95, and the leading end surface of the scale 120 is projected from the upper surface of the original table glass 29. The position is restricted. The lever 124 has a support shaft 125 at one end, which is a rib 611 fixed to the inner frame 610 of the ADF 60.
Is engaged with an elongated hole 612 extending vertically. The lever 124 is connected to a spring 127 having one end fixed to the inner frame 610 and is biased upward. The substantially central portion of the lever 124 is the plunger S of the solenoid SL1.
Although L1a is connected and the free end of the lever 124 contacts the scale 120 when the solenoid SL1 is off,
The scale 120 is not pushed down. In this mechanism, when the solenoid SL1 is switched to the ON state, the lever 12 moves as the plunger SL1a descends.
4 rotates clockwise and pushes down the scale 120. The scale 120 includes the scale descending positioning protrusion 12
0 a is in contact with the upper surface frame 2 and stops. At this point of time, the stroke of the solenoid SL1 is excessive, and the movement of the plunger SL1a after that is the spring 1
The extension of 27 and the downward movement of the long hole 612 of the support shaft 125 are absorbed. In addition, the drive source may be a rotary solenoid or a motor irrespective of the embodiment described above, and the drive force transmission means itself is made of a flexible material or shape, or uses a frictional force or a magnetic force. A torque limiter type absorption mechanism may be used.

Notch 1 provided at the tip of the scale 120
The operation of 20e will be described. In the ADF 60, as described above, a plurality of originals conveyed between the separation roller 75 and the separation pad 80 based on the paper feeding action of the pickup roller 65 are separated by the separation roller 75 and the separation pad 8 from each other.
It is separated one by one by the separation effect of 0. At this time, a slip occurs between the document that is separated and conveyed toward the platen glass 29 and the separation pad 80, and further, the separation pad 8
Since 0 is made of a material with a relatively high coefficient of friction,
Paper dust or shavings of a document image (especially, an image with poor printability or image fixing property such as a copy document or a pencil-written document) is generated on the document portion that comes into contact with the separating pad 80, and the shaving dust adheres to the document. , Or once attached to the loosening pad 80,
Adheres to the following document. Similarly, paper dust adheres when the separated document passes through the separation pad 80 based on the driving of the registration rollers 90. The paper dust or the like adhered to the original adheres to the original when the original contacts a portion having a high contact pressure or a large contact angle with the original such as the resin film 133 (see FIG. 2) or the tip of the scale 120. Paper dust is scraped off and stains the platen glass 29, or falls into the inside of the copying machine main body 1 through the gap between the platen glass 29 and the upper frame 2 of the main body to pollute the optical system and chargers and deteriorate the image quality. Invite. Therefore, in the copying machine of the present embodiment, as shown in FIG. 15, the cutouts 1 are formed at the tip portions of the scale 120 and the resin film 133 at the portions located on the extension of the separation roller 75 in the document conveying direction.
20e and 133a are formed. Therefore, the paper dust on the original attached to the contact portion with the separating pad 80 is not scraped off by the resin film 133 or the scale 120, and the above-mentioned problem is solved. The AD of this embodiment is
In F, a movable scale is used, but the same applies to a fixed scale. Further, the separating method uses the separating pad, but the same applies to various kinds such as a reverse roller type. Further, if paper dust or the like is generated at the registration roller or the reversing roller portion, a notch may be provided at a portion corresponding to the position. On the other hand, in the configuration of the ADF, the conveyance unit of the platen glass may be a roller other than the belt,
Further, the same effect can be obtained in the configuration in which copying is performed while passing the image on the fixed image reading unit at a constant speed.

<Document Feeding Unit> The document feeding unit 601 will be described. In FIG. 16, the document guide plate 131 is installed at a position slightly lower than the top of the pickup roller 65 and the separation roller 75 from the tip of the tray 61, and the tip thereof extends to the registration roller 90. The other document guide plate 132 is installed from above the separation roller 75 to the downstream side of the registration roller 90. The tip regulation plate 63 is fixed to the support shaft 64 while being fixed to the guide plate 13.
1, which is installed on the lower side of the guide plate 131, and is movable between a restricting position (a position shown in the figure) in which the tip of the guide plate 131 protrudes from the guide plate 131 and a retracted position retracted below the guide plate 131. Normally, the leading edge regulating plate 63 is set at the regulating position and has a function of receiving the leading edge of the document set on the tray 61 to give the operator a feeling of setting and align the leading edge of the document.
When the document feed start signal is issued, the leading edge regulation plate 63 is retracted below the guide plate 131 and is held at this retracted position until the final document is fed.

The original pressing plate 70 is a pickup roller 65.
As shown in FIG. 17, a plurality of guide sleeves 70b provided on the original pressing plate 70 are provided with
It is inserted into a guide pin 74 fixed to a guide plate 134 so that it can be moved up and down and can be brought into and out of contact with a pickup roller 65. The document pressing plate 70 has the other end of a tension coil spring 73 whose one end is connected to both ends thereof. Each of them is connected to the guide plate 134 and is constantly urged upward. Lever 7
As shown in FIG. 18, 2 is fixed to a support shaft 71 and is rotatable about the support shaft 71 as a fulcrum. The support shaft 71 can be reciprocally rotated by the rotation driving means shown in FIG. 18, and the lever 72 is normally displaced to the solid line position, but is urged to rotate counterclockwise in the paper feeding operation. The document pressing plate 70 is urged toward the pickup roller 65, and the document to be fed is pressed against the pickup roller 65 with a predetermined pressure. The document pressing plate 70 has a number of documents,
The pickup roller 65 is moved in parallel with and perpendicular to the pickup roller 65 in order to achieve a reliable separation action with a constant document entry angle with respect to the front separation plate 85 and the separation roller 75 regardless of the thickness. Further, the document pressing plate 70
17, as shown in FIG. 17, the guide sleeve 70b and the guide pin 74 are fitted with a gap, and the pressing surface 72a of the lever 72 is a spherical surface, and this spherical surface contacts the back surface of the document pressing plate 70. By doing so, the two paper feed rollers 65 can be brought into parallel contact with each other and pressure can be evenly applied, thereby preventing the skew of the document.

The frictional force μ1 between the separating roller 75 and the original, the frictional force μ2 between the separating pad 80 and the original, and the frictional force μ3 between the originals are set so that μ1>μ2> μ3. As a result, of the two or three originals that have been "fed" by the pickup roller 65, one of the lowest layers
The sheet passes between the separating roller 75 and the separating pad 80.

Further, in order to improve the separating performance, as shown in FIG. 16, a front separating plate 85 and an elastic sheet 86 attached to the front separating plate 85 are installed immediately before the separating pad 80. The front separating plate 85 is provided in a downward slope from above the leading end regulating plate 63 in the sheet feeding direction, and the lower end thereof is close to the surface of the separating roller 75 immediately before the separating pad 80 with a slight gap. The lower end of the elastic sheet 86 is close to the surface of the separating roller 75 with a slight gap. The leading ends of the plurality of originals fed by the pickup roller 65 come into contact with the front separating plate 85, where the lower originals are advanced,
Only one or two originals pass through the lower end of the front separating plate 85. The elastic sheet 86 assists the front separating action of the front separating plate 85. Note that, in FIG. 16, reference numeral 132a denotes a document which is conveyed between the guide plates 131 and 132 by the sensor SE.
2, SE10 is a detection hole for detection.

<< Driving Mechanism of Tip Regulation Plate 63 and Pressing Plate 70 >> The driving mechanism of the tip regulation plate 63 and the pressing plate 70 will be described. 18, a lever 140 is integrally fixed to an end of a support shaft 64 to which a tip regulating plate 63 is fixed, and a torsion spring 141 constantly biases the support shaft 64 in a counterclockwise direction. By this urging force, the tip regulation plate 63
Is set to a regulation position protruding from the guide plate 131. Support shaft 71 to which holder 72 of pressing plate 70 is fixed
The lever 142 is integrally fixed to the end portion of the shaft, and is constantly urged in the counterclockwise direction by the torsion spring 143. The urging force causes the pressing plate 70 to elastically press the document on the pickup roller 65.

Fan-shaped cam plates 145, 146 are installed between the levers 140, 142. The cam plates 145, 1
A spindle 147 of 46 is connected to a pickup motor M1 capable of rotating in the forward and reverse directions. The lever 140 faces the outer peripheral surface of the cam plate 145, and the lever 142 faces the outer peripheral surface of the cam plate 146. The levers 140 and 142 rotate based on the forward / reverse rotation of the cam plates 145 and 146, and the tip regulating plate 6
3 and the position of the pressing plate 70 are set. Discs 148 and 149 are fixed to the cam shaft 147.
8, 149 notch edges 148a, 148b, 14
9a and 149b are transmissive photosensors SE11 and SE
12 (light emitting element x, light receiving element y) passes through the optical axis. The rotation of the cam plates 145 and 146 is controlled by the ON / OFF operation of the photosensors SE11 and SE12.

More specifically, when the ADF 60 is in the standby state, the levers 140 and 142 and the cam plates 145 and 146 are at the positions (home positions) shown in FIG. 19, the tip regulating plate 63 is set to the regulating position, and the pressing plate 70 is It is set in the retracted position. After the power is turned on, the pickup motor M1 is driven in the reverse direction, and the cam plate 14 together with the cam shaft 147 is driven.
5, 146 and the disks 148, 149 are reversed in the clockwise direction. Immediately after the reverse rotation, the sensor SE11 detects the edge 148a of the disk 148 and turns it off, whereby the cam 145,
The home position of 146 is confirmed, and the pickup motor M1 is temporarily turned off. When a document replacement signal is subsequently issued, the pickup motor M1 is driven in the reverse direction, the cam plates 145, 146 rotate in the clockwise direction, and the sensor S
E12 detects the edge 149b of the disk 149 and turns off, which turns off the pickup motor M1.
It stops at the position shown in FIG. 21 with some overrun. At this time, the lever 142 separates from the large-diameter portion of the cam plate 146, rotates downward by the spring force of the torsion spring 143, and the lever 72 rotates, whereby the pressing plate 70 is rotated.
Moves vertically downward, presses the leading edge of the document against the pickup roller 65, and applies a sheet feeding pressure. Further, the lever 140 comes into contact with the large diameter portion of the cam plate 145, and the tip regulation plate 6
3 rotates downward and retracts below the guide plate 131.

In this state, the pickup roller 65 and the separating roller 75 are rotationally driven to feed the first original. When the leading edge of the fed document reaches the registration roller 90, the pickup motor M1 is driven in the reverse direction, the cam plates 145, 146 rotate in the clockwise direction, and the sensor SE
12 is turned on by the edge 149a of the disc 149, which turns off the pickup motor M1. At this time,
As shown in FIG. 20, the levers 140 and 142 hold the tip regulation plate 63 in a standby state, and the pressing plate 70 retracts upward to release the pressing force on the document.

For the second and subsequent originals, the pickup motor M1 is driven to rotate normally, the cam plates 145 and 146 rotate counterclockwise, and the sensor SE11 detects the edge 148b of the disk 148 to turn it off. As a result, the pickup motor M1 is turned off, but it stops at the position shown in FIG. 21 with some overrun. Then, similarly to the above, the pickup roller 65 and the separating roller 75 are driven to rotate,
The first and subsequent documents are fed. When the leading edge of the fed document reaches the registration roller 90, the pickup motor M1 is driven in reverse and returns to the pressing release position shown in FIG.

As described above, by operating the pickup motor M1, the rotation angle is minimized in both the case of pushing from the home position (FIGS. 19 to 21) and the case of pushing from the release position (FIGS. 21 and 22). Can be Further, the pickup motor M1 is prevented from being displaced due to the overrun of the pickup motor M1 due to the difference in the rotation direction.
Disk 149 by sensor SE12 when is driven in reverse
The edge 149b of the disk 148 is slightly faster than the detection of the edge 148b of the disk 148 by the sensor SE11. Conversely, the detection of the edge 148b of the disk 148 by the sensor SE11 when driven in the normal direction is detected by the sensor SE12. The sensor position and the disc are designed so as to be slightly earlier than the detection of the edge 149b of the disc 149 by.

That is, in this embodiment, the drive mechanism for the tip regulating plate 63 and the pressing plate 70 is simplified by a single system, and since it is driven by the cam plates 145, 146, no noise is generated during driving. .. Further, since the leading edge regulating plate 63 is held at the retracted position from the start to the end of the paper feeding operation, the leading edge of the document is not damaged and the document is not skewed. Further, the pressing plate 70 presses the original only while the leading end of the original is passing the separating roller 75, and then retracts upward, so that there is no possibility of a paper feed error such as a document feeding.

<< Registration Roller >> The registration roller 90 will be described. In FIG. 16, the registration roller 90
In the nip portion, the leading edge of the document fed by the rotation of the pickup roller 65 and the separating roller 75 is temporarily received at the nip portion, and the leading edge of the document is aligned at the nip portion to correct the skew of the document. A predetermined period of time has passed since the sensor SE2 detected the leading edge of the fed document, and the feeding motor M2
Is turned off, and the pickup roller 65 and the separating roller 75 are turned off.
Rotation is stopped. At this time, the leading end of the original comes into contact with the nip portion of the registration roller 90 and forms a slight loop.

Thereafter, the registration roller 90 is rotationally driven by turning on the main motor M3 at the same timing as the copying operation in the copying machine main body 1, and sends the original document to the entrance portion of the original table glass 29. As described above, in this embodiment, the pickup roller 65 and the separating roller 75 are separately driven by the sheet feeding motor M2, and the registration roller 90 is driven by the main motor M3 together with the conveyor belt 95. Also,
One-way clutches 67 and 77 are provided between the pickup roller 65 and its drive shaft 66, and between the separation roller 75 and its drive shaft 76, and the original is sent by the registration roller 90 even when the paper feed motor M2 is off. At that time, the pickup roller 65 and the separation roller 75 are allowed to rotate idly in the clockwise direction.

A drive mechanism for the registration roller 90 and the conveyor belt 95 will be described. As shown in FIG. 22, a timing belt 155 is stretched between an output pulley 150 provided on the output shaft of the main motor M3 and a pulley 153 rotatably supported by a support shaft fixed to a frame (not shown). ing. A timing belt 157 is stretched between a pulley 154 integrally formed with the pulley 153 and a pulley 156 fixed to the support shaft 91 of the registration roller 90. A gear 158 is fixed to the other end of the support shaft 91 of the registration roller 90, and the gear 15 is rotatably supported by a support shaft 160 fixed to a frame (not shown).
9, and the gear 159 is engaged with the gear 161 fixed to the support shaft 162 of the drive roller 96. As a result, when the main motor M3 rotates in the direction of the arrow, the registration roller 90 and the drive roller 96 rotate in the same direction,
The conveyor belt 95 moves in the direction of arrow d. Further, the main motor M3 can rotate in the forward and reverse directions, and in the 2-in-1 mode or the double-sided mode, the document can be temporarily conveyed in the direction opposite to the direction of the arrow d.

<< Registration Roller 90, Paper Feeding Roller 65,
And Arrangement of Separation Roller 75 >> The arrangement relationship of the registration roller 90, the paper feed roller 65, and the separation roller 75 will be described with reference to FIG. In the ADF 60 of this embodiment, the sheet passing reference PS is provided on the back side of the copying machine, that is, on the side opposite to the operating side. The registration roller 90 and the separating roller 75 are
The rollers are arranged symmetrically with respect to the roller arrangement reference RS. This is to prevent a skew from occurring due to a moment when a document held between the separating roller 75 and the separating pad 80 is pulled out by the registration roller 90. Further, the conveying force of the registration roller 90 is set to be considerably larger than the conveying force of the separating roller 75, and slippage of the document at the time of conveyance by the registration roller 90 is prevented. Further, in the direction orthogonal to the document conveying direction, the central registration roller 90 and the separation roller 75 are at a distance D1, and the registration rollers 90, 90 and the separation rollers 7 on both sides are separated.
5 are arranged at a distance D2. Therefore, dirt such as paper dust generated in the pick-up section and the separating section is not transferred to the registration roller 90.
The carrying force of 0 is kept constant, and since dirt is not attached to the registration roller 90, dirt is not transferred from the registration roller 90 to the original.

<< Mechanism for Opening / Closing the Original Paper Feeding Path of the Original Paper Feeding Unit >> In FIG. 24, one registration driving roller 90a constituting the registration roller 90 is fixed to the support shaft 91a. The support shaft 91a has bearing holes 173a and 173a provided in the main frame 173 of the ADF 60, and the bearing 17
It is rotatably supported via 4a and 174a and is drivingly connected to the main motor M3. Further, cams 171a and 172a are provided on the support shaft 91a. The other registration driven roller 90b forming the registration roller 90 is fixed to the support shaft 91b. The support shaft 91b is a support shaft 91.
The bearings 174b, 17 are arranged in the long hole-shaped bearing holes 173b, 173b provided in the main frame 173 in parallel with a.
It is rotatably supported by a support shaft 91a via 4b so as to be movable back and forth. Eccentric cams 171b and 172 are provided on the support shaft 91b.
b is rotatably provided, and a frame 174 for holding the opening / closing cover 604 of the document feeding section 601 is an eccentric cam 171.
A guide plate 135, which is fixed to b and guides the original that has passed through the registration rollers 90 onto the original table glass 29, is fixed to the eccentric cam 172b. The support shaft 91b is biased toward the support shaft 91a by a biasing means such as springs 174c and 174c.

The document feeding section 601 having such a configuration
Then, in a normal state in which the cover 604 and the guide plate 135 are closed with respect to the ADF 60, as shown in FIG.
Registration driving roller 90a and registration driven roller 90b
Is pressed. At this time, the cams 171a and 172a are separated from the eccentric cams 171b and 172b, respectively,
The center interval between them is set to M1. From this state, for example, when the cover 604 is rotated in the direction of the arrow f in order to take out the original jammed in the sheet passing path from the separating section to the registration section, the eccentric cam 171b rotates and its outer peripheral portion contacts the cam 171a. Further, when the cover 604 is further rotated against the biasing force of the spring 174c from this contact state, as shown in FIG. 26, the support shafts 91a and 91b are rotated.
The center distance between the registration driving roller 90a and the registration driving roller 90a increases to M2 (> M1).
On the other hand, as shown in FIG. 27, when the guide plate 135 is rotated in the direction of the arrow g in order to take out the original jammed on the downstream side of the registration portion, the eccentric cam 172b rotates and its outer peripheral portion comes into contact with the cam 172a. The center interval between the support shafts 91a and 91b spreads to M3 (> M1) and the registration driven roller 9
0b separates from the registration driving roller 90a. In addition,
The rollers 90a and 90b are often made of an elastic member such as rubber or sponge on the outer periphery thereof. With such a roller, it is not necessary that the rollers 90a and 90b be completely separated from each other. It is sufficient if the pressure contact force between the two can be weakened to the extent that the original held between them can be pulled out without damage. As described above, in the document feeding unit 601, the resist driven roller 90b is biased to the resist driving roller 90a by the springs 174c and 174c, and the cover 904 and the guide plate 135 are provided on the support shaft 91a based on the opening operation. The cam 171a,
Eccentric cams 171b, 1 fixed to 172a and support shaft 91b
72b is engaged with each other to release the pressure contact of the registration roller 90. Therefore, the roller 90a
It is possible to uniformly and accurately set the pressure contact force of the shafts 90b and 90b in the axial direction, and to keep the pressure contact force properly regardless of the mounting accuracy of the cover 904 and the locking force. Although the registration driven roller is retracted in this embodiment, the registration driving roller may be retracted. Further, the reverse relationship between the driving and the driven is also applicable.

<< Cover Supporting Mechanism >> The cover 604 is rotatably supported by the frame 174 via a shaft 175, as shown in FIG. A guide plate 132 is fixed to the frame 174.
The cover 604 is urged in the counterclockwise direction by a spring 176 or an elastic member such as sponge. As a result, when the cover 604 is closed, the cover 604 is urged by the spring 174, and the document transport unit 6
05 is abutted and positioned. Therefore, the cover 6
Even if a document or the like is placed on 04 and an external force is applied, the separation pressure between the separation roller 75 and the separation pad 80 is not affected. Further, even when a force is applied to the cover 604 from the side, the movement of the cover 604 is absorbed by the spring 176 and does not affect the separation pressure. Therefore, a stable handling pressure can always be secured. Moreover, an excessive load is not applied to the drive motor of the separating roller 75.

<< ADF Document Transport Mode >> The document transport mode of the ADF 60 will be described. In this example,
In addition to the double-sided mode that has been used conventionally, there are four types of document transport modes, a pre-step mode, a 2-in-1 mode, and a count mode. Further, the document transported by the ADF 60 is accurately stopped at the exposure reference position SP. For this purpose, there are a scale mode suitable for normal paper and a pulse control mode suitable for thin paper, and the scale mode and the pulse control mode are selected by the document selection key 105 provided on the operation panel (see FIG. 126). . In the transportation of the document, the document is set in the nip portion of the registration roller 90 when the leading edge of the document is set at the exposure reference position SP, when it is set at the exposure position, when it is set at the intermediate position IP. It is called the first-out position. Regarding the size of the document, when the size is not specifically described, it is assumed that the small size is A4 horizontal feed and the large size is A3 vertical feed.

The scale mode is a mode in which the leading edge of the original document conveyed by the conveyor belt 95 is brought into contact with the scale 120 and forcibly stopped. In this case, the solenoid SL1 is turned off as shown in FIG. As a result, the tip of the scale 120 is projected onto the platen glass 29. The leading edge of the document D transported in the direction of arrow d by the transport belt 95 contacts the scale 120, and the transport force of the transport belt 95 is set to be weaker than the buckling resistance of the document. A slip will occur and the vehicle will be accurately stopped at the reference position SP.

In the pulse control mode, as will be described below, the registration roller 90 and the conveyor belt 95 are driven by a single main motor (stepping motor) M3 so that the two conveyor speeds are the same, and the original document is conveyed. Transport length L
This is a mode for accurately controlling (see FIG. 30). The document conveyance amount with respect to the drive pulse number of the main motor M3 is known in advance. Therefore, the stop position of the document is determined by driving the main motor M3 with the number of pulses corresponding to the length L of the document waiting immediately before the registration roller 90 to the reference position SP. During execution of this pulse control mode, the solenoid SL1 maintains the ON state, and the scale 120 holds the position retracted downward from the upper surface of the document glass 29.

Comparing the scale mode with the pulse control mode, the scale mode shows that the original is scaled 120.
It has an advantage that the stop position accuracy is high since it is stopped by hitting. However, when the document is thin, the buckling resistance of the document is small, and there is a problem that the front end is likely to be bent or a paper jam occurs. The pulse control mode has an advantage that troubles at the time of stop do not occur even with a thin original, but there is a problem that the stop position accuracy is not necessarily as high as that of the scale mode due to slip of the original and deviation of response of the driving mechanism.

In the pre-step mode, when the document size is half or less from the exposure reference position SP to the document advance position (the position where the leading edge of the document contacts the registration roller 90), as shown in FIG. The leading edge of the original document D1 is stopped by aligning its leading end with the exposure reference position SP, and the leading edge of the next document D2 is conveyed to a position where its leading edge matches the intermediate position IP. This is a mode in which the paper is fed in advance until the leading edge contacts the registration roller 90. When combined with the pulse control mode in the pre-step mode, the main motor M3 performs a pulse so as to convey the document by a distance corresponding to 1/2 of the distance L from the registration roller 90 to the reference position SP when the document is replaced. Only P02 is driven forward. That is, the first original document D1 set at the exposure reference position SP
The main motor M3 generates a pulse P each time the exposure of
The second original D2 is conveyed to the exposure reference position SP by the forward rotation of 02, and the third original waiting on the registration roller 90 is conveyed to the intermediate position IP.

On the other hand, when the pre-step mode is combined with the scale mode, when the originals are replaced, as shown in FIG.
As shown in, the main motor M3 is (L / 2) + (α /
The pulse P is used to convey the original for a distance corresponding to 2).
Only 02 'is driven forward. α is an overrun amount for surely bringing the leading end of the document into contact with the scale 120. Therefore, the second document D2 is conveyed from the registration roller 90 by (L / 2) + (α / 2) at the intermediate position I.
Wait at P '. This second document D2 has an intermediate position I
From P ′ by the conveyor belt 95 (L / 2) + (α /
2) A moving amount of movement is given, but (L / 2)-(α /
When the sheet is conveyed by 2), the leading end comes into contact with the scale 120 and stops at the exposure reference position SP, and the conveying belt 95 slips on the original by the distance α.

By the way, in such a scale mode, the solenoid SL1 is normally turned off and the scale 12
Reference numeral 0 projects upward from the upper surface of the platen glass 29.
The solenoid SL1 is turned on immediately before the document passes through the exposure reference position SP, and retracts the scale 120 below the platen glass 29.

<Pre-step mode> FIGS. 31 to 39 show a document conveying state in the pre-step mode. FIG. 31 shows a state where the originals are set on the tray 61, and here, 3
It is assumed that the small size originals D1, D2 and D3 are set. First, the tip regulation plate 63 retracts downward, and the pressing plate 70
Moves downward, and the pickup roller 65 and the separation roller 7
5 is rotationally driven, the first document D1 is fed, and the apparatus stands by with the leading end abutting the registration roller 90 (FIG. 3).
2). Next, the main motor M3 is driven to rotate forward by the pulse P02, and the document D1 is conveyed to the intermediate position IP (see FIG. 33). Next, the pickup roller 65 and the separating roller 75 are rotationally driven, and the second document D2 stands by at the registration roller 90 (see FIG. 34). Further, the main motor M3 is driven to rotate in the normal direction by the pulse P02, and the document D
1 is conveyed to the exposure reference position SP, and the document D2 is conveyed to the intermediate position IP (see FIG. 35). Here, in the copying machine main body 1, the feeding of copy paper and the exposure by the optical system 20 are performed as many times as the number of copies. Third document D during exposure
3 is fed in advance to the registration rollers 90 (see FIG. 36).
reference).

When the exposure of the document D1 is completed, the main motor M3 is driven in the normal direction by the pulse P02, and the discharge motor M4 is driven to rotate the reverse roller 100 and the discharge roller 110. The document D1 is now in the tray 11
5 and the document D2 is exposed at the exposure reference position SP.
The document D3 is conveyed to the intermediate position IP (see FIG. 37). Here, the document D2 is exposed, and when the exposure is completed, the main motor M3 is driven in the normal direction by the pulse P02, and the discharge motor M4 is also driven. Therefore, the document D2 is placed on the tray 1
Then, the document D3 is conveyed to the exposure reference position SP (see FIG. 38). After the exposure of the document D3 is completed, the main motor M3 and the discharge motor M4 are driven to discharge the document D3 onto the tray 115 (see FIG. 39).

By the way, in the present embodiment, the original fed in advance is fed to the platen glass 2 by the registration roller 90.
9 and the trailing edge of the original is the registration sensor S.
When it is detected by E2, the empty sensor SE1 is checked, and if the document remains on the tray 61, the first-out paper feeding is performed. If there is no document, the leading edge regulation plate 63 is returned to the upper regulation position.

Here, the positional relationship between the registration roller 90, the resin film 133 and the pre-step position IP will be described with reference to FIG. The conveyor belt 95 is driven by a driving roller 96, and the driving roller 96
Even if you stop the drive to and fix with the brake,
The driven roller 97 further advances due to the inertia of the driven roller 97 and the delay in transmission of the driving force of the belt 95, and then the relationship between the tension side and the slack side generated during driving tries to return to the original balanced position. The document on the glass 29 is moved by a small amount. In the copying machine of this embodiment, the document moves on the platen glass 29 upstream in the document transport direction.

Therefore, in the ADF 60 of this embodiment, since the resin film 133 is provided in the belt conveying portion, if the length of the original is dp and the distance from the nip of the registration roller 90 to the tip of the resin film 138 is d1, then L / 2-
When d1≈dp, this pre-step position IP
The rear end of the original document to be stopped in the above step interferes with the resin film 133. Further, if a minute skew occurs during the conveyance of the resist, only a part of the trailing edge of the document interferes with the resin film 133, which further aggravates the skew state. Therefore, in the ADF 60 of this embodiment, the relationship of L / 2−d1 <dp is set, and the disturbance of the original stopped state due to the interference with the resin film 133 is eliminated. In addition, the conveyor belt 9
When the return amount of 5 is β, the same effect can be obtained even if L / 2−d1-β> dp. Further, in the scale mode, L / 2-α / 2-d1 <dp, L / 2-α /
Each length may be set so as to satisfy the relationship of 2-d1-β> dp. In this embodiment, the nip position of the registration roller 90 is set to the forward position, but it may be positioned by a sensor or the like or may be regulated by a stopper gate.

As described above, in the pre-step mode, since the document is step-fed in units of (L / 2), the document replacement time is short, and the optical system 20 after exposure is completed.
The originals can be exchanged within the time it returns to the home position, improving copy productivity. Moreover, the succeeding original document (third original document) is fed in advance until its leading edge comes into contact with the registration roller 90. This advance feeding is performed during the exposure of the original document, and contributes to the improvement of copy productivity.

Further, as shown in FIG. 22, the registration roller 90 and the conveyor belt 95 are combined into a single main motor M3.
Since the main motor M3 is driven as a stepping motor in a pulse manner without interposing a clutch, the number of pulses supplied to the motor M3 is controlled, so that the document sent from the registration roller 90 is accurately referenced. It can be transported / stopped to the position SP. The motor M3 need not be a stepping motor, but the same effect can be obtained by attaching an encoder to the rotary shaft and converting the number of revolutions into the number of pulses to control the on / off of the motor M3.

<< 2-in-1 Mode >> The 2-in-1 mode will be described. The 2-in-1 mode is a mode in which two originals are set as a set and arranged on the platen glass 29 to form an image on one copy sheet. 40 to 51 show a document conveyance state in the 2-in-1 mode. In FIG. 40, the original is a tray 61
In this case, it is assumed that four small size documents D1, D2, D3 and D4 have been set. First, the first original D1 is fed and stands by with its leading edge in contact with the registration roller 90 (see FIG. 41). Next, the main motor M3 is rotated in the normal direction, and the document D1 is fed onto the platen glass 29. When the rear end of the document D1 reaches the platen glass 29 (see FIG. 42), the main motor M3 is switched to the reverse rotation, and the document D1 is switched back in the direction opposite to the arrow d. As a result, the rear end of the document D1 enters below the guide plate 132 and the film 133 (see FIG. 43). The switchback amount corresponds to the same length as the trailing edge of the original reaches the nip portion of the registration roller 90. It should be noted that when the switchback is performed, the resin film 13 is provided so that the trailing edge of the document does not return to the registration roller 90 side.
Guided by 3. The feeding of the second document D2 is started a predetermined time after the trailing edge of the first document D1 is detected by the registration sensor SE2, and immediately after the switchback of the document D1 is completed, the leading edge of the document D2 is fed. Is the registration roller 9
It contacts 0 and stops (see FIG. 43).

Next, the main motor M3 is driven in the forward direction to convey the originals D1 and D2 on the platen glass 29, and the original D
The main motor M3 is turned off at the time when the tip of No. 1 reaches the exposure reference position SP. As a result, the originals D1 and D2 are arranged side by side on the platen glass 29 (see FIG. 44). The rotation of the main motor M3 is decelerated immediately before the document D1 reaches the exposure reference position SP. The feeding of the third document D3 is started in synchronization with the timing of this deceleration. Then, by the end of the exposure of the originals D1 and D2, the leading edge of the original D3 comes into contact with the registration roller 90, and the first-out paper feeding is completed (see FIG. 45).

When the exposure of the originals D1 and D2 is completed, the main motor M3 is driven in the normal direction and the discharge motor M4 is driven. The document D1 is the reverse roller 100 and the discharge roller 1.
10 is sent to the tray 115, and the document D2 becomes the document D.
After the first, the third document D3 is the platen glass 29.
It is fed up (see FIG. 46). When the rear end of the document D3 reaches the platen glass 29, the main motor M3 is switched to the reverse rotation, and the document D3 is switched back like the document D1. At this time, the document D1 is given a conveying force by the reversing roller 100, and is directly discharged onto the tray 115. Since the leading edge of the document D2 has not yet reached the reversing roller 100 when the switchback is started, the document D2 is switched back together with the document D3 (FIG. 47).
reference). The fourth original D4 is fed out to the registration rollers 90 immediately after the completion of the switchback.

The discharge motor M4 is driven as it is, and then the main motor M3 is normally driven. The main motor M3 is driven to rotate normally until the leading edge of the document D3 reaches the exposure reference position SP, whereby the documents D3 and D4 are juxtaposed on the platen glass 29 and the document D2 is discharged onto the tray 115 (see FIG. 48). ). The discharge motor M4 is turned off when the document D2 is discharged. In this way, the originals D1 and D2 are
The subsequent document D3 is once switched back in the middle of discharging, so that the interval is opened. When the two originals are pushed out onto the tray 115 without a gap, the succeeding originals stick out the preceding originals and the alignment on the tray 115 is disturbed, or the subsequent originals slip under the preceding originals and the page order is changed. Disturbed. However, as in this embodiment, the tray 115 is provided by opening the space between the two originals D1 and D2 at the time of ejection.
It is possible to eliminate the disorder of the original document.

When the exposure of the originals D3 and D4 is completed, the main motor M3 is driven in the normal direction and the discharge motor M4 is driven. The main motor M3 is once turned off when the rear end of the document D3 is separated from the conveyor belt 95 (FIG. 4).
9). When the main motor M3 is off,
The interval between the originals D3 and D4 corresponds to the time for opening the tray 115 to the extent that the tray 115 is not disturbed (see FIG. 50).
Here, the main motor M3 is driven to rotate normally, and the document D4 is discharged onto the tray 115 (see FIG. 51).

The discharge of the original document after the exposure and the setting of the subsequent original document at the exposure position SP are performed as described above. The reversing roller 100 and the discharging roller 110 are connected to the main motor M.
3 is driven by an independent discharge motor M4 different from 3,
Since the conveying force by the reversing roller 100 and the pinch roller 101 is set to be larger than the conveying force by the conveying belt 95, the document introduced into the discharge portion is conveyed by the conveying belt 9
5 can be discharged onto the discharge tray 115 regardless of the operating state. The switchback point BP (see FIG. 30) is constant regardless of the length of the document.

However, when the document size is dp, the distance from the nip portion of the registration roller 90 to the leading end of the film 133 is d1, the distance from the leading end of the film 133 to the switchback point BP is d2, and the pinch roller 1 is used.
If the distance from 01 to the exposure reference SP is d3, d3
If the positional relationship is such that> d1 + d2 (= d4) (see FIG. 30) is satisfied, when the trailing edge of the succeeding document reaches the switchback point BP, the second sheet of the preceding document has the reversing roller 100 and the pinch roller. After reaching 101, the preceding two originals are continuously discharged without a gap. When the leading edge and the trailing edge of two originals are overlapped with each other in this discharging process, the two sheets of paper are placed below the first discharged original on the discharge tray 115.
The first original slips in or pushes out the preceding original, disturbing the original alignment. The same problem occurs when the preceding document (especially the first sheet) has a short size and the succeeding (third sheet) document has a long size. At this time, the difference in the document length Δdp (copier .DELTA.dp = d, where dpmax is the maximum document length in the document transport direction and dpmin is the minimum document length in the document transport direction for which the 2-in-1 mode can be executed.
pmax-dpmin), d3> d4 + Δd
The positional relationship is set to satisfy p: (d4 = d1 + d2). As a result, the two originals that are exposed at the same time are ejected from the original table glass 29 with a sufficient space between them, and the arrangement order of these two originals is not disturbed.

<< Double-sided Mode >> The basic operation of the double-sided mode will be described. As shown in FIG. 52, when the documents D1 and D2 are set on the document tray 61 and the copy start button of the copying machine body 1 is turned on, the ADF 60 starts the document feeding operation. When the document is fed, the pressing plate 70 presses the leading end of the document D1. Then, the document D1 is conveyed to the position of the registration roller 90 based on the rotations of the pickup roller 65 and the paper feed roller 75, and the leading end of the document is registered to the registration roller 90.
The pickup roller 65 and the paper feed roller 75 stop rotating when they come into contact with and form a loop (see FIG. 53). Further, the pressing state of the document D1 by the pressing plate 70 is released, and the operation of feeding the first document is completed.

Next, the registration roller 90 and the conveyor belt 9
5, the reversing roller 100 is rotated, and the document D1 is conveyed onto the document table glass 29. Further, the scale solenoid SL1 is turned on to retract the leading end of the scale 120 to below the document table glass 29, and the switching claw 103 operates to switch the sheet feeding path of the document discharging section to the reverse path. When the exposure is completed, the document D1 is sent to the reversing path of the ejecting unit, and the registration roller 90, the conveyor belt 95, and the reversing roller 10 are held with the leading end held by the second driven roller 102.
0 is temporarily stopped (see FIG. 54).

After a predetermined time, the reversing roller 100 rotates again, the conveyor belt 95 reverses, and the conveyance of the document D1 is restarted. As a result, the document D1 passes through the reversing path and is sent again onto the document table glass 29, set at the exposure position SP, and the back side of the document is copied (see FIG. 55). When the copying of the back side of the document is completed, the document D1 is conveyed again to the reverse path, and the front side of the document is copied this time (see FIGS. 56 and 57). When the exposure operation on the surface of the original is completed, the registration roller 90, the conveyor belt 95, and the reversing roller 100 rotate, the switching claw 103 operates in the opposite direction, and the first original is ejected onto the paper ejection tray 115. (See FIG. 58). When the first document is ejected, the switching claw 103 operates again, and 2
The document transport path is switched to the reverse path in order to reverse the first document (see FIG. 59). The second original is conveyed to the position of the registration roller 90 during the exposure of the surface of the first original (see FIG. 57), and the first original is placed on the original table glass 29.
Immediately after being discharged from the sheet, it is supplied to the exposure position SP on the platen glass 29 and processed in the same manner as the first original (see FIGS. 60 to 63).

<< Count Mode >> The count mode will be described. The count mode is a mode in which, before the copy process is started using the ADF 60, the document is cycled through the ADF 60 in advance without the copy operation and the number of documents is counted. If the number of originals is odd in 2-in-1 mode, ADF starts feeding from the last page
In 60, there is a problem that the image of the first page is formed on half of one copy sheet, that is, half of the cover of the copy is blank. Therefore, the ADF 60 counts the number of documents in advance, and if the number is an odd number, the last page document to be fed first is transported to the platen glass 29 only once, and the subsequent documents are transported in the 2-in-1 mode described above. I decided to. Further, since similar problems occur in double-sided copying and composite copying, it is necessary to count the number of documents in advance in the count mode.

Since the copy operation is not involved in the count mode, it is preferable to process as fast as possible (short time). However, in the ADF 60, since the front end of the document is stopped at the reference position SP on the downstream side of the platen glass 29 in the transport direction, when the document is stopped at the reference position SP even in the count mode, the distance between the document and the document is increased. Will be larger, and more time will be spent idling.

Therefore, in the count mode, the trailing edge of the document is placed at the stop reference position X on the platen glass 29 (see FIG. 2).
The document is temporarily stopped on the basis of the time when it reaches (see 9). As a result, the distance between the originals during execution of the count mode becomes the length from the stop reference position X to the nip portion of the registration roller 90, and the processing time is greatly reduced. The arrival of the trailing edge of the document at the reference position X can be detected by detecting the trailing edge of the document by the registration sensor SE2 and then counting the number of pulses for driving the main motor M3.

The reference position X here is not limited to the position shown in FIG. 29 and can be set arbitrarily. If the reference position X is on the upstream side of the stop reference position SP during the copying operation, the processing time in the count mode is Contributes to shortening. Further, the reference position X does not need to be set on the platen glass 29, and may be on the downstream side of the nip portion of the registration roller 90. Reference position X
The processing time is shortened as the distance from the registration roller 90 approaches the nip portion.

Further, in the count mode, it is preferable that the ADF 60 conveys the document at a speed higher than the reference speed at which the document is conveyed during the copying process. Furthermore,
When performing not only the count mode but also the operation of the ADF 60 that delays the copy operation, that is, the operation that causes the reduction of the copy productivity of 100% described above, the document conveyance speed must be faster than the reference speed. Is preferred. The operation of delaying the copy operation means that when the double-sided original is reversed by the reversing roller 100, the first original to be fed is conveyed to the exposure reference position SP, and the last original to be fed from the original table glass 29. It is time to discharge to the tray 115.

<< Control Circuit and Control Procedure of ADF60 >> A
The control circuit and control procedure of the DF 60 will be described. Figure 6
Reference numeral 4 denotes a control circuit of the copying machine. This control circuit includes a CPU 1 for controlling the copying machine main body 1 and a CPU 2 (see FIG. 65) for controlling the ADF 60.
U2 exchanges information at necessary timings.

The control of the copying machine will be specifically described below with reference to the flowchart. By the way, in the following control, the on-edge means that the switch, the sensor, the signal, etc. are switched from the off state to the on state, and the off-edge is the switch, the sensor, the signal, etc. are switched from the on state to the off state. means. In addition, the sensor SE
1, SE2, SE3, SE10, SE11, and SE12 are turned on when the optical axis is shielded, and turned off when they are opened. In the case of a flag, "1" is turned on and "0" is turned off.

<< Main Routine >> FIG. 66 shows the main body 1 of the copying machine.
The main routine of CPU1 which controls is shown. When the power is turned on and the CPU 1 is reset and the program starts, in S1, the RAM is cleared, various registers are reset, and various devices are initialized to the initial mode. Then, the internal timer is started in S2. The internal timer defines the time required for one routine of this main routine, and its value is set in S1. The internal timer serves as a reference for counting various timers that appear in each subroutine.

Next, the subroutines of S3 to S10 are sequentially called to perform the necessary processing, and in S11, the processing returns to S2 after waiting for the end of the internal timer. S3 is an input processing subroutine for processing information input from the operation panel or the like,
S4 is a display processing subroutine for processing the display of various display units arranged on the operation panel, S5 is a subroutine for feeding copy paper to the timing roller 38, S6 is a subroutine for erasing the surface charge of the photosensitive drum 10, and S7. Scans the optical system 20 to move the photosensitive drum 1
0, a subroutine for forming an electrostatic latent image on S0, S8 is an APS (automatic sheet selection) processing subroutine for automatically selecting an appropriate size sheet from the document size and copy magnification, S8
Reference numeral 9 is a stop position adjustment processing subroutine for adjusting the original stop position on the original table glass 29, and S10 is other processing, that is, driving of the photosensitive drum 10 and its surrounding elements, conveyance of copy paper, fixing, and paper jam detection. When the processing such as, or when entering the stop position adjustment mode, the platen glass 2
9 is a subroutine for performing processing for adjusting the original stop position on the document 9. The CPU 1 is connected to the CPU 2 via a serial communication line, and its transmission / reception is performed in S12 by interrupt processing.

<< APS Processing Routine >> In the APS control routine, as shown in FIG. 67, it is determined whether the APS mode is selected in S8-1. This APS mode is set and set / released by an APS mode selection key (not shown) provided on the operation panel of the copying machine main body 1. If the APS mode is selected, S8-
In step 2, the APS process is performed, that is, a sheet of the optimum size is supplied from the paper feed unit based on the original size and the copy magnification. Here, if the sheet of the compatible size is accommodated in the sheet feeding unit, the process returns (S8-3). If the sheet of the compatible size is not accommodated in the sheet feeding unit, the switch SW2 is turned on in S8-4. Determine whether or not. The switch SW2 is a switch for instructing whether or not to convert an inch system size into a metric system size (A size or B size).
In the copying machine using the size of the metric system as the reference size, when the switch SW2 is turned on, the APS is performed in S8-5.
The inch size read in the mode is converted as shown in Table 1 below, and in S8-6, the converted size sheet is fed from the sheet feeding unit that accommodates the size sheet. Conversely, when the switch SW2 is turned off, the metric system size on the right side of Table 1 is converted to the inch system size on the left side. In this table, L is the vertical direction (longitudinal direction) and T is the horizontal direction (short side direction).
Means

[0091]

[Table 1] Reading size Size after conversion Letter (L / T) → A4 (L / T) Legal → B4 (L) FLS → B4 (L) 11 × 15 (L) → A3 (L) 11 × 17 ( L) → A3 (L)

<Original Stop Position Processing> In the original stop position processing (S9), as shown in FIG. 64, it is determined whether or not the original stop position adjusting switch SW1 is turned on in S9-1. It is preferable that the document stop position adjusting switch SW1 is provided, for example, behind the copying machine main body 1 and is placed in a place where the user cannot see it under normal conditions. If the document stop position adjustment switch SW1 is turned off, the process returns. If it is turned on, the document mode is determined in S9-2, and depending on whether the one-sided mode or the two-sided mode 2-in-1 mode is selected, S9- is selected. 3, S9-4 and S9-5 are branched, and the adjustment amount ADJ1, AD of the document stop position input from the 10 key is input.
J2 and ADJ3 are stored in the RAM of the copying machine main body 1 and the process returns.

Here, the adjustment amount ADJ1 is the document stop position adjustment data in the single-sided mode and the 2-in-1 mode, and
A positive value is input when moving the document stop position to the upstream side with respect to the document transport direction, and conversely, a negative value is input when moving the document stop position to the downstream side.
The adjustment amount ADJ2 is data for adjusting the document stop position in the double-sided mode, and a plus value or a minus value is input according to the moving direction. ADJ3 means a space adjustment amount between two documents placed on the platen glass 29 in the 2-in-1 mode. These adjustment amounts ADJ1 to ADJ3 stored in the RAM of the copying machine body 1
Is transmitted from the CPU 1 of the main body of the copying machine to the CPU 2 of the ADF 60, and the drive system is controlled based on the data.
As a result, the adjustment amounts ADJ1, ADJ2, and
By inputting ADJ3, the document stop position in various modes and the interval between two documents simultaneously exposed in the 2-in mode can be adjusted to appropriate values.

<Erase> FIG. 69 shows an erase subroutine executed in S6. In this subroutine, first, in S6-1, it is determined whether or not the first half erase flag is "1". If the first half erase flag is "1", S
In 6-2, the eraser 13 removes charges in the first half of the area on the photoconductor corresponding to the original placed on the original table glass. For example, if the area corresponding to the A3 size should be originally charged on the photoconductor according to the size of the original placed on the original platen glass or the arrangement position of the original, the first half eraser flag is set to "1". If set to, the first half of the charged area on the photoconductor corresponding to the A3 size is illuminated to remove the electric charge. On the other hand, if the first half eraser flag is "0", it is determined in S6-3 whether the second half erase flag is "1". If the latter half erase flag is "1", the original plate glass 29 is placed in S6-4. The eraser 13 removes electric charges in the latter half of the area on the photoconductor corresponding to the original document. However, if the latter half erase flag is also "0", the inter-image portion is erased in S6-5.

Specifically, in the case of the A
When the DF is adopted, when the 2-in-1 mode is set and an odd number of originals are set on the original tray 61, the first half erase flag is set to "1" in the CPU 1 in the copying process for the original of the last page. The original of the last page is set on the original table glass 29 with the leading edge thereof aligned with IP, and the charged electric charge in the area on the photoconductor corresponding to the area from the scale 120 to the original is removed. The second half erase flag is set to the 2-in-1 mode, and is set to 2 out of a pair of originals set on the platen glass.
If the first document is large, set it to "1" and press C
It is transmitted to PU1, and the charged electric charge in the area on the photoconductor corresponding to the second original is removed. Note that the entire surface of the second original is then copied onto a single sheet.

<Scan> FIG. 70 shows a scan subroutine by the optical system 20 executed in S7. First,
In step S7-1, it is determined whether the pre-step mode is set, and step S7-
In step 2, it is determined whether the flag LSIZE is "1", and in step S7-
In 3, it is determined whether or not small size paper has already been fed.
The flag LSIZE is set to "1" and sent to the CPU 1 when a large-sized document is set at the exposure position. If YES is determined in all of S7-1, S7-2, and S7-3, the book scan is processed in S7-4. Book scanning refers to a scanning mode of the optical system 20 in the book division copying process described in the document transportation in the pre-step mode. Then, in S7-5, the paper for transferring the image at the time of the latter half of the book scan is first fed out.

<< Explanation of Pulse and Timer >> Before explaining the control procedure of the CPU 2 for controlling the ADF 60, a counter used for control, a pulse for controlling the main motor M3,
The timer will be described.

Counter DCNT1: Used to feed copy paper to the copying machine main body 1, and its value is CPU1
Is transmitted by interrupt processing to. When a document is set on the tray 61 (when the empty sensor SE1 is turned on)
If it is set to "1" and the sensor SE1 is on at the off edge of the registration sensor SE2, it is incremented,
It is decremented at the on-edge of the flag DCHG requesting the replacement of the document. The copying machine main body 1 controls to feed the number of sheets obtained by multiplying the value of DCNT1 by the number of copies.

Counter DCNT2: Counts the number of documents in the transport path of the ADF 60 in the count mode. It is incremented at the on-edge of the registration sensor SE2 and decremented when the document is completely discharged.

Counter DCNT3: Used in the pre-step mode and the 2-in-1 mode to count the number of sheets discharged during the document replacement process. In the document exchange process, the number of documents set on the platen glass 29 is set and decremented when the document discharge is completed.

Counter GCNT: Used to count the number of originals during copy processing. Registration sensor S
It is incremented at the off edge of E2 and reset at the end of the copy process.

Counter PLSCNT1: Main motor M
The number of pulses after 3 is turned on is counted. It is incremented during normal rotation and decremented during reverse rotation.

Counter PLSCNT2: Counts the number of pulses of the main motor M3 after the registration sensor SE2 is turned off. It is incremented at the time of forward rotation and decremented at the time of reverse rotation.

Counter SIZCNT1: Used to detect the size of the original. When the registration sensor SE2 is turned off, the value of PLSCNT1 is stored.

Pulse P01: The number of pulses from the forward rotation of the main motor M3 to the deceleration when a small-sized document is conveyed in the pre-step mode. At the end of this pulse number, advance feeding of the next document is started.

Pulse P02: The number of pulses from when the main motor M3 is normally driven to when it is turned off when a small-sized document is conveyed in the pre-step mode, L / 2
Equivalent to.

Pulse P03: The number of pulses from when the main motor M3 is driven in the normal direction to when the main motor M3 is decelerated in the pre-step mode except for small size originals. At the end of this pulse number, advance feeding of the next document is started.

Pulse P04 (corresponding to L): The number of pulses from when the main motor M3 is driven in the normal direction to when it is turned off except when a small-sized document is conveyed in the pre-step mode.

Pulse P05: Two small size originals are set on the platen glass 29 in the 2-in-1 mode.
When the next large document is conveyed, the main motor M3
The number of pulses from when the motor is driven in the forward direction until it is decelerated.

Pulse P06 (A4 traverse + α, or L /
(Corresponding to 2): The number of pulses from when the main motor M3 is normally driven to when it is turned off when a large-sized original is conveyed following two small-sized originals on the platen glass 29 in the 2-in-1 mode ( Stop once to eject the original document).

Pulse P07: The number of pulses from when the registration sensor SE2 is turned off to when the main motor M3 is reversely driven when a small-sized document is conveyed in the 2-in-1 mode.

Pulse P08: The number of pulses when a small size original is switched back in the 2-in-1 mode.

Pulse P09: The number of pulses from when the registration sensor SE2 is turned off to when the main motor M3 is turned off in the count mode.

Timer T101: Pickup motor M1
The timing for turning on the paper feed motor M2 is set after the is turned off.

Timer T102: The paper feed motor M2 is turned off after the registration sensor SE2 is turned on.

Timer T201: The timing for turning off the stopper solenoid SL1 is taken after the main motor M3 is turned off.

Timer T202: Pickup motor M is activated after the registration sensor SE2 is turned off in the 2-in-1 mode.
Take the timing to turn 1 on.

Timer T301: The discharge motor M4 is turned off after the discharge sensor SE3 is turned off.

Timer T401: 2 in the second embodiment
When ejecting the last two documents in the in-1 mode, the main motor M3 is turned on and then turned off.

Timer T501: 2 in the second embodiment
When the document is switched back in the in-1 mode, the main motor M3 is reversely driven and then turned off.

FIG. 71 shows the main routine of the CPU 2 which controls the ADF 60. When the power is turned on, the CPU2 is reset and the program starts, SS1
Clears the RAM, resets various registers, and makes initial settings for setting various devices to the initial mode. Then, the internal timer is started at SS2. The internal timer defines the time required for one routine of this main routine, and its value is set at SS1. This internal timer also serves as a reference for counting various timers that appear in the subroutines described below.

Next, the subroutines SS3 to SS7 are sequentially called to perform the necessary processing, and at SS8, the end of the internal timer is awaited and the process returns to SS2. SS3 is AD
This is a subroutine for checking the opening / closing of each opening / closing mechanism for the opening / closing process of the document platen glass of F and the jam processing of ADF to determine whether each unit is open or closed. SS4 is a subroutine for setting the document transportation speed of the ADF 60. SS5 is a subroutine for exchanging a document on the platen glass 29. SS6 is a subroutine for counting various timers. SS7 processes other processes, such as A / D conversion, input process, output process, and paper jam detection.

As shown in FIG. 72, the interrupt processing for the CPU2 is, as shown in FIG. It is appropriately performed regardless of the processing in.

<Initial setting> FIG. 73 shows the initial setting (SS1) subroutine executed in S101. SS1-
At 1, each data and each counter in the RAM are cleared.
In SS1-2, timers T101, T102, T202,
Reset T301. At SS1-3, each flag is reset. In SS1-4, each motor M1, M2, M
3, M4 and scale solenoid SL1 are turned off. S
In S1-5, the internal timer is set to a predetermined value. SS
In 1-6, it is checked whether or not the leading edge regulating plate and the pressing plate are in the initial home position. Other initial settings are processed in SS1-7.

<< Home Check >> The home check subroutine shown in FIG.
It is checked whether 0 (collectively referred to as "pickup unit") should be in a predetermined home position. First, in SS1-6-1, it is determined whether or not the sensor SE1 is off, and in SS1-6-2, it is determined whether or not the sensor SE2 is off. And the sensor SE
When both 1 and SE2 are off, that is, when there is no document on the document tray 61 and there is no document at the first-out position, the document feeding status K is set to "1" at SS1-6-3. , The process of returning the pickup unit to the home position is executed. When there is a document on one of the document tray 61 or the first-out position and either one of the sensors SE1 and SE2 is turned on, SS1-6
At -4, the paper feed status K is set to "2", the return processing to the home position is not executed, and the current state is maintained.

<< Open / Close Check >> FIG. 75 shows the details of the open / close check subroutine of SS3. In this subroutine, it is determined at SS3-1 whether or not the ADF 60 is closed with respect to the platen glass 29. And ADF6
If 0 is closed, it is determined at SS3-2 and SS3-3 whether the paper feed side cover 604 and the paper discharge side cover 606 are closed, and both covers 604 and 606 are closed. For example, in SS3-4, it is determined whether the paper feed status K is not "2". If K ≠ 2, that is, if the home position is not present, the above home check processing is executed (SS3-5), and if K = 2. Without executing the home check process, it is determined in SS3-12 whether or not copying is in progress. If copying is in progress, SS3-6 is not executed, and if not in copying, in SS3-6, for example, the ADF after jam processing is performed.
It is checked whether or not there is a document left behind in 60. On the other hand, if it is determined in SS3-1 that the ADF 60 is open with respect to the platen glass 29, in SS3-7, AD
The jammed state is reset regardless of whether or not the document is jammed in the paper feed unit or the paper discharge unit of F60. As a result, even if the document is jammed inside the ADF 60, the document can be placed on the platen glass 29 and copied when the ADF 60 is opened. Therefore, AD
A user who puts an original on the original table glass 29 and tries to make a copy without using the F60 can make a necessary copy prior to the jam processing of the ADF 60. Next, when the jammed state is reset, or when the covers 604 and 606 of the sheet feeding unit or the sheet discharging unit are opened, S
In S3-8, each data and each counter in the RAM are cleared, and in SS3-9, the timers T101, T102, T20.
2, T301 is reset, each flag is reset at SS3-10, and each motor M1, M2, M is reset at SS3-11.
3, M4 and scale solenoid SL1 are turned off.

<< Forgotten Check >> FIG. 76 shows SS3-
The details of the forget-to-take check subroutine 6 will be described. In this subroutine, firstly at SS3-6-1, the sensor SE1 is
Is turned on, that is, whether or not there is a document on the document tray 61. If the sensor SE1 is off (no original document), the forget-to-take flag 1 and the forget-to-take flag 2 are reset to "0" at SS3-6-10.
On the other hand, when it is determined that the sensor SE1 is on (the document is present), it is determined at SS3-6-2 whether the sensor SE2 is off, that is, whether the document is present at the advance position of the registration roller, and the sensor SE2 is turned off ( If there is no manuscript) SS3
If the forgetting flag 1 is reset to "0" in -6-3 and the sensor SE2 is on (there is a document), SS3-6-
In step 4, the forgotten flag 1 is set to "1". Then S
In S3-6-5, it is determined whether or not the sensor SE3 is off, that is, whether or not there is a document in the reversing unit. If the sensor SE3 is off (no document), the forgetting flag 2 is set in SS3-6-6.
Is reset to "0", and if the sensor SE3 is on (there is an original), SS3-6-7 sets the forgetting flag 2 to "1".
Set to. When the forget-to-take flag 1 and the forget-to-take flag 2 are set by the above processing, it is determined at SS3-6-8 whether the forget-to-take flag 1 and the forget-to-take flag 2 are “0”, that is, there is no forget-to-take manuscript. Then, if any of the forget-to-take flags 1 and 2 is set to "1", the copy process is prohibited and the process returns. As a result, in SS2-6-9, when the document is set on the document tray tray 61, the presence or absence of the document that has been forgotten in the ADF 60 is checked, and the copy process is prohibited, so that the user can quickly respond. Further, if an operation panel or the like is provided with a display for displaying the existing position of the document left behind, it is possible to immediately know the position of the document left behind, and it is possible to take prompt action.

<< Speed Setting >> FIG. 77 shows a speed setting subroutine executed in SS4. Here, the document conveyance speed (belt speed) by the conveyance belt 95 is V0, V
Set to 4 types of 1, V2, V3. Belt speed V1, V
2, V3 is a value corresponding to each copy speed, assuming that there are three types of copy speed depending on the model of the copying machine.

The belt speed V1 is a speed that maintains 100% copy productivity in combination with a model in which A4 transverse feed is used and the copy speed is 60 cpm. That is, it means the speed at which the original can be replaced within the return time of the optical system 20. Specifically, if the system speed of the main body of the copying machine is 300 mm / sec, the scan length in A4 transverse feeding is 210 mm. The return time of the optical system 20 is (60sec / 60cpm)-(210mm / 300mm
/ sec) = 0.3sec (cpm: cycle perminitut
e). As shown in FIG. 28, when the distance from the nip portion of the registration roller 90 to the exposure reference position SP is L, the transport distance at the time of document exchange in the pre-step mode is L / 2, and the document exchange time is (L / 2V1). So L
/ 2 V1 ≤ 0.3, V1 ≥ L / 2 x 0.3.

Belt speed V2 has a copy speed of 4
The copier body of 5 cpm and the belt speed V3 correspond to the copier body of copy speed 30 cpm. Here, V1>V2> V3.

The belt speed V0 is a speed at which the first document is conveyed to the exposure reference position SP, and is set to a value higher than the belt speed V1 in order not to reduce copy productivity. Also, the belt speed is
In other than the pre-step mode, that is, in the double-sided document transport mode, the count mode of the number of documents, etc., V0 is set.

In this subroutine, first, SS4-1
Then, it is determined whether or not the process of setting the first original at the exposure position SP is completed. If it is not completed, SS4-2
To set the belt speed to V0. If you're done,
In SS4-3, it is determined whether or not the pre-step mode is set. If the pre-step mode is not set, the process proceeds to SS4-2.
If it is the pre-step mode, the copy speed is checked at SS4-4. The copy speed is checked based on the copy speed data of the copying machine body 1 transmitted from the CPU 1. If the copy speed is 60 cpm,
Set the belt speed to V1 with SS4-5, 45cp
If m, SS4-6 is used to set the belt speed to V2. If it is 30 cpm, the belt speed is set to V3 at SS4-7. When the belt speed is set to V0, the current control value output from the CPU 2 is set to I0A in SS4-8. Similarly, when the belt speed is set to V1, V2, and V3, SS4-9, SS4-10, SS4-1, respectively.
At 1, the current control values are set to I1A, I2A and I3A.

Next, as shown in FIG. 78, SS4-12
In S4-15, the main motor M is used to reverse the original from the back side to the front side in the duplex mode in SS4-15.
It is determined whether or not 3 is being rotated normally. And AD
When F60 is set to any of these states, the load applied to the conveyor belt 95 at that time is small, and therefore the main motor M3 is normally trapezoidally controlled at SS4-13 (see FIG. 79 (a)). Further, in this state, it is not necessary to pull out the original from the separating section, and an excessive load is not applied to the main motor M3. Therefore, the current control value is reduced by I4A at SS4-14. On the other hand, when the final document is not discharged or the document front surface is not being set in the double-sided mode, it is determined at SS4-16 whether the main motor M3 is decelerating and the deceleration is being performed (see FIG. 79 (a)). ), The required torque of the main motor M3 is small, and the load is small because the document is not caught in the separation section. Therefore, the current control value is lowered by I4A at SS4-14. However, SS4-1
2, SS4-15, SS4-16, when it is determined that the final document is not being discharged, or the document surface is not being set in the double-sided mode, or the main motor M3 is not decelerating-that is, the registration portion or the separation. When there is a document in the sheet, when the loop of the document stopped at the first-out position is resolved, the load fluctuation applied to the main motor M3 is large at this time, so the stepping motor M3 is kept at a constant low speed until the loop is resolved. Is controlled to accelerate when the loop is cleared (SS4-17) (FIG. 79).
(See (b) and (c)). Since an excessive load is applied to the stepping motor M3 when the document is pulled out from the separating section, the current value is kept in a normal state at this time. That is, in this subroutine, the current value is controlled according to the load applied to the main motor M3, which leads to a reduction in power consumption.

The belt speeds V1, V2 and V3 are C
Other than the method of setting based on the data transmitted from PU1, the setting may be made by a dip switch built in the ADF 60. Alternatively, this type of data detection means may be provided at the contact portion of the ADF 60 with the copying machine body 1. Specifically, a magnet indicating the copy speed is installed on the upper frame of the copying machine main body 1, and the AD
A sensor for detecting the magnet is installed in F60. The CPU 2 reads the copy speed of the copying machine main body 1 and sets the belt speed on the basis of the signal indicated by the magnet from this sensor.

<Original Replacement> FIG. 80 shows a subroutine for original replacement executed in SS5. In this subroutine, MODE is checked at SS5-2, and the following processing is performed based on the value. MODE is set to a predetermined value according to the document conveyance mode selected by the operator.

First, the paper feed process is executed at SS5-1, and then the MODE is judged at SS5-2. When MODE is "0", the start check is processed in SS5-3. When it is "1", SS5-4 pre-step set,
The discharged sheets are processed at SS5-5. When it is "2", SS5-
6 in 2 in 1 set, SS5-7 discharge paper.
If "3", SS5-8 counts the number of originals, SS
At 5-9, the count discharge is processed. SS when "4"
In 5-10, the paper feed process for the double-sided mode is executed, and SS
Paper discharge processing is performed at 5-11. When MODE is a value other than the above, other operations such as double-sided mode are processed in SS5-12.

<< Start Check >> FIG. 81 shows SS5-3.
The start check subroutine to be executed at is shown below.
This subroutine is executed when MODE is "0", that is,
Processed when the ADF 60 is on standby. First, SS5
At 3-1 it is determined whether or not the empty sensor SE1 is on. If it is not turned on, it means that the original has not been set on the tray 61, and DC is set at SS5-3-2.
Reset NT1 to "0". When the sensor SE1 is turned on (when a document is set on the tray 61), SS5
-3-3, set DCNT1 to "1", SS5-3
At -4, it is determined whether the flag DCHG is "1". The flag DCHG is a command for requesting document replacement when it is "1", and is transmitted from the CPU 1. This flag D
CHG is set to "1" when the print key is turned on and the scanning for the number of copies is completed. Therefore, flag D
If CHG is "0", it immediately returns. If it is "1", this flag DCHG is reset to "0" at SS5-3-5, and status K is set to "3" at SS5-3-6. . The status K is used in the paper feeding subroutine and is set to "3" to feed the originals one by one.

Next, the original mode is checked at SS5-3-7. SS5-3-8 in pre-step mode
To set MODE to "1", 2-in-1 mode to SS5-3-9 to set MODE to "2", and double-sided mode to SS5-3-10 to set MODE to "4". If it is the count mode, SS5-3-11
To set MODE to "3". The description is omitted for other document modes. In the count mode, this subroutine is terminated. In the pre-step mode and 2-in-1 mode, DCNT1 is decremented in SS5-3-12, and the feed amount setting process is executed in SS5-3-13.

<< Feeding amount set >> FIG. 82 shows SS5-3-1.
3 shows the processing contents of the feed amount setting subroutine in the 2 in 1 mode. In SS5-3-101, it is determined whether or not the thin paper mode setting switch 105a on the operation panel is turned off, that is, whether the application mode or the thin paper mode is selected. Is set to. The thin paper mode setting switch 105a can be freely operated by the user and is pressed when the original is thin paper. Further, it is determined at SS5-3-102 whether the stop position adjustment mode is set, and SS5
In step 3-103, it is determined whether or not the single-sheet set flag is set to "0". This one set flag is 2
When the number of originals is an odd number in the in-1 mode, the last page original (which is first fed in the copying machine of this embodiment) is set to "1" when it is set on the original platen glass 29. It As a result of these processes, the thin paper mode setting switch is turned off (the application mode is set), the stop position adjustment mode is not set, and the one-sheet set flag is "0".
When set to, the processing of SSS5-3-105 to SSS5-3-107 is executed, and otherwise, the processing of SS5-3-108 to SS5-3-111 is executed.

At SS5-3-104, the thin paper flag is reset to "0", and SS5-3-105 and SS5-3 are set.
At -106 and SS5-3-107, counters PO2, PO4, and PO8 that define the document feed amount are set to (L / 2 + α / 2), (L + α), and (SB-α / 2), respectively. On the other hand, in SS5-3-108, the thin paper flag is set to "1", and SS5-3-109, SS5-3
At -110 and SS5-3-111, the original feed amount counters PO2, PO4, and PO8 are respectively set to L / 2, L, and
Set to SB. Here, SB is the stepping motor pulse number required to switch back the first document in the 2-in-1 mode, and if SB is increased, the trailing edge of the first document and the leading edge of the second document are increased. And the distance between
On the contrary, if SB is reduced, the interval becomes longer. That is, in the contact mode, the distance between the trailing edge of the first document and the leading edge of the second document is wider than in the thin paper mode, and the document is conveyed on the platen glass.

When the number of pulses of the main motor M3 which defines the document feed amount is set as described above, SS5-3
At -112, each counter PO2 and the like are corrected according to the individual ADF. That is, the document feed amount counter PO2 in the single-sided mode, the single-sided large size document feed amount counter PO4, the document feed amount counter PO14 for reversing the document in the double-sided mode, and the document feed amount PO8 required for switchback.
Respectively (PO2 + ADJ1 / 2), (PO4 + AD
J1), (PO14-ADJ2), (PO8-ADJ)
Update to 3). The counter correction amounts ADJ1 and AD
J2 and ADJ3 are input from the copying machine main body 1 (see FIG. 68).
reference). As described above, even in the normal mode (imposition mode), when the number of originals is odd and only one final page is set on the original glass, the original conveyance control based on the pulse control is started. Therefore, it is possible to accurately stop the document at a position where there is no scale.

<Paper feeding> FIGS. 83 to 87 show the paper feeding subroutine executed in SS5-1. In this subroutine, the paper feed status K is checked at SS5-1, and the following processing is performed based on the values "0" to "8". When the status K is "1", the tip regulation plate 63 and the pressing plate 70 are moved to the home position. That is, as shown in FIG. 84, the pickup motor M1 is reversely rotated at SS5-1-2, and it is determined at SS5-1-3 whether the cam sensor SE11 is off-edge. The home position of the leading edge regulation plate 63 is a regulation position (upward movement) for the document, and the pressing plate 70 is used.
The home position of is the pressing release position (upward movement) for the document. When the pickup motor M1 connected to the cam shaft 147 is rotated in the reverse direction and the cam sensor SE11 is shielded from light by the edge portion 148a of the disk 148 and turned off, both are set to the home position (position in FIG. 19). Therefore, when the off edge of the cam sensor SE11 is confirmed at SS5-1-3, the pickup motor M1 is turned off at SS5-1-4, and the status K is set to "2" at SS5-1-5.

When the status K is "2", nothing is processed. When the status K is "3", the tip regulation plate 6
3 is moved to the retracted position, and the pressing plate 70 is moved downward to apply the feeding pressure to the document. That is, it is determined at SS5-1-6 whether or not it is the first document, and if it is not the first document, the leading edge regulation plate 63 is at the retracted position and the pressing plate 70 is at the released position (sensor SE12). 20 detects the edge portion 149a and moves the pickup motor M1 forward in SS5-1-7, and the cam sensor SE is detected in SS5-1-8.
It is determined whether 11 is an off edge. Due to the normal rotation of the pickup motor M1, the cams 145 and 146 rotate counterclockwise from the position of FIG. 20, and the cam sensor SE11 is shielded by the edge portion 148b of the disc 148 and turned off.
At this time, as shown in FIG. 21, the leading edge regulating plate 63 maintains the retracted position, and the pressing plate 70 pushes the leading edge of the document against the pickup roller 65. Therefore, if the on edge of the cam sensor SE11 is confirmed in SS5-1-8, SS
At 5-1-9, the pickup motor M1 is turned off, and SS5
The motor M2 is turned on at -1-10. Furthermore, SS5-
1-11 sets timer T104, SS5-1-1
At 2, the status K is set to "5". On the other hand, SS5
If it is determined in 1-6 that the original is the first original, SS5
The main motor M3 is turned on at -1-13, and SS5-1-
At 14, the status K is set to "4".

As shown in FIG. 85, when the status K is "4", since it is the first sheet, the phase alignment of the main motor M3 and the pickup motor M1 are reversed from the home position to the pressing position at SS5-1-15. The main motor (stepping motor) M3 is rotated for a predetermined time to determine whether or not the phase alignment of the main motor M3 and the process of eliminating the backlash of the drive system have been completed. Here, the circuit of the main motor M3 is shown in FIG. In this circuit, the stepping motor M3 is designed to rotate by being given a drive signal in the order of A phase → A ′ phase → B phase → B ′ phase, and the current control output and the A phase of the main motor M3. The drive signal is given by the CPU 2.
The current value of the current control output is input to the comparator 1000, where it is compared with a predetermined current value set by the resistor 3000, and when the current control output has a large value (+), the comparator 1000 Outputs an "H" signal. Next, the AND gate 2000 performs an AND operation with the A-phase drive signal of the main motor (stepping motor) M3, and the drive signal is also turned on here, that is, if it is in the "H" state, it is driven to the A-phase by the transistor 4000. Apply current. In this figure, as an example, only a circuit diagram for giving an ON signal to the A phase is shown, but A'phase, B phase, B '
The same applies to the phases, and the main motor M3 is rotationally driven by the flow of drive signals in the order of A phase → A ′ phase → B phase → B ′ phase. However, the main motor M3 may not be processed due to jam processing or the like.
When the rotating shaft of is forcibly rotated, for example, starting from the A'phase and B'phase, the motor rotating shaft reversely rotates once and A
The phase and the B phase are restored, and the forward rotation operation starts from there, and the number of pulses sent to the main motor M3 and the sending amount thereof do not match. Further, the drive system is provided with a large number of gears, toothed belts, and the like, and at the time of starting, the state in which the backlash of each gear or the like is eliminated shifts to a normal rotation operation. So SS5-1
In No. 15, first, the stepping motor M3 is driven before the start of the document feeding operation, and the count value of the pulse counter PLSCNT1 is necessary to eliminate the variation in the feed amount due to the reverse rotation of the main motor M3 and the backlash of the drive system. It is determined whether the value (P00) has been reached, and PLSCNT1
When becomes P00, the main motor M3 is stopped (SS5
-1-16). Therefore, the count value P00 must be a value required for phase alignment of the main motor M3 and elimination of backlash in the drive system. For example, as shown in FIG. 87, when the start switch of the copying machine is turned on, the main Since the motor M3 is a two-phase excitation, it is desirable to give at least 4 pulses and rotation to the main motor M3. what if,
For 1-2 phase excitation, 8 or more pulses are required.

Next, at SS5-1-17, the motor M1 is rotated in the reverse direction to move the tip regulating plate 63 downward to the retracted position, and the pressing plate 70 is moved.
Move down to the pressing position. Sensor S in SS5-1-18
Edge portion 14 of disk 149 due to off-edge of E12
When 9b is detected, the motor M1 is stopped at SS5-1-19. As a result, the position shown in FIG. 19 is changed to the position shown in FIG. Then, the motor M2 is driven at SS5-1-20 to convey the document forward, and the timer T is sent at SS5-1-21.
Set 103, set status K to "5" at SS5-1-22, and return. The timer T103 is
By detecting whether or not the document fed from the document tray 61 has reached a predetermined position within a predetermined time, it is detected whether or not the document is jammed. SS5-1
The timer T104 set at 11 is also a similar jam detection timer, but the timer value has a relationship of T104 <T103, and the first sheet is a little longer. Although the leading edge of the first document is at the position of the leading edge regulation plate 63,
It is set in consideration of the fact that the sheets after the first sheet are fed to some extent and have come to the vicinity of the nip portion between the separation roller 75 and the separation pad 80. As a result, it is prevented that the timer value of the first sheet is too short and jams frequently occur, and the timer values of the second and subsequent sheets are too short to damage the document.

When the status K is "5", SS5-1
At -23, it is determined whether or not the document has been conveyed to the position of the registration roller 90 by detecting the on-edge (with document) of the sensor SE2, and another timer T102 is started at SS5-1-24 where the on-edge is detected. Set, S
The timers T103 and T104 are reset in S5-1-25, the document counter DCNT2 is incremented, and the status K is changed to "6" in SS5-1-27. On the other hand, if no document is detected in SS5-1-23, S
Timer T is set in S5-1-28 and SS5-1-29, respectively.
It is determined whether or not 103 and T104 are finished. If they are finished, SS5-1-30 is set as a paper feed jam.

When the status K is "6", as shown in FIG. 88, it is confirmed at SS5-1-31 that the timer T102 has finished counting. When the timer T102 ends, the leading edge of the document comes into contact with the nip portion of the registration roller to form a loop. And timer T
When the end of 102 is confirmed, it is determined at SS5-1-32 whether the width sensor SE10 is on or off. Width sensor SE1
0 is for detecting the width of the fed document,
If it is on, the width flag is set to "1" at SS5-1-33, and if it is off, the width flag is reset to "0" at SS5-1-34. Subsequently, the paper feed motor M2 is turned off at SS5-1-35, and the pickup motor M1 is rotated reversely at SS5-1-36. As a result, only the pressing plate 70 starts moving upward to the pressing release position. At this time, the tip regulation plate 63
Keeps the retracted position. Furthermore, SS5-1
Set status K to "7" at -37.

When the status K is "7", the pressing plate 7
0 is moved to the upper pressure release position. Cam plate 145
When 146 reverses clockwise by 160 ° (see FIG. 20), the tip regulation plate 63 maintains the retracted position below, while the pressing plate 70 retracts upward. At this time, the cam sensor SE12 is shielded by the edge portion 149a of the disc 149 and turned on. Therefore, at SS5-1-38, the cam sensor S
When the on-edge of E12 is confirmed, SS5-1-39
Then, the pickup motor M1 is turned off. Then SS5
At -1-40, it is determined whether the flag DSET is "0". This flag DSET is set to "1" when the document is set at the exposure position. Flag DSET is "0"
Only in this case, the set status S is incremented at SS5-1-41. Further, the status K is set to "8" at SS5-1-42.

This completes the document feeding process. When the status K is "8", nothing is processed. As described above, the rotation direction of the pickup motor is changed for the first sheet and other sheets (see FIG. 87). 1st sheet (K
= 4), the motor M1 is rotated in the reverse direction and other than the first sheet (K =
3), the motor M1 is rotating normally. This is because the first sheet rotates from the home position (position in FIG. 19) to the pressing position (position in FIG. 21), and the sheets other than the first sheet rotate from the pressing release position (position in FIG. 20) to the pressing position (FIG. 21). This is because the rotation angle is reduced to shorten the operation time. Further, at this time, if the same edge portion is detected by the same sensor, the final stop position due to the overrun of the motor deviates from the position shown in FIG. 21 in different directions. In that case, the cam shape must be designed in consideration of the deviation due to the overrun, and the angle for holding the pressing release position must be widened, which also causes a delay in the operation time. Will end up. Therefore,
In the present invention, the edge portion 149b is detected by the off-edge of SE12 on the first sheet (when M1 reverse rotation), and other than the first sheet (M
1) (at the time of forward rotation)
8b is detected and the motor M1 is turned off. The positional relationship between these is designed so that the position where the cam stops due to overrun is the position shown in FIG. Therefore, the stop position does not deviate due to the overrun of the motor due to the difference in the rotating direction. 89 to 96 show a pre-step set subroutine executed in SS5-4. In this subroutine, as shown in FIG. 89, SS5-4-
Check the set status S with 1 and set the value to "0"
~ The following processing is performed based on "9".

As shown in FIG. 90, when the status S is "0", nothing is processed. When the status S is "1", the main motor M3 is rotated at high speed in SS5-4-2. As a result, the document is sent from the registration roller 90 onto the platen glass 29. And SS
At 5-4-3, it is determined whether the PLSCNT1 has counted the pulse P01. PLSCNT1 pulse P01
Is counted, the registration sensor S is detected at SS5-4-4.
It is determined whether or not E2 is off, and it is determined at SS5-4-5 whether or not the empty sensor SE1 is on. Pulse P01
Is the number of pulses corresponding to a small-sized document, and if the registration sensor SE2 is off and the empty sensor SE1 is on, that is, if the fed document is of a small size and the next document remains on the tray 61. , SS5-4-6 sets the status K to "3", SS5-4-7 decelerates the main motor M3, and SS5-4-8 sets the status S to "2".

On the other hand, if the registration sensor SE2 is on, the original is large, and therefore the flag LSIZE is set to "1" at SS5-4-10 and SS5-4-1 is set.
At 1, the status S is set to "7". If the empty sensor SE1 is off, there is no next document, so the status K is set to "1" at SS5-4-9, and S
The status S is set to "7" in S5-4-11.

When PLSCNT1 is counting the pulse P01 (NO at SS5-4-3), as shown in FIG. 91, when the off edge of the registration sensor SE2 is confirmed at SS5-4-12, SS5- In 4-13, the size of the original is detected. Further, at SS5-4-14, it is determined whether or not the empty sensor SE1 is on, and if it is on (if there is a next document), then DCNT at SS5-4-15.
Increment 1.

When the status S is "2", it is determined at SS5-4-16 whether or not the PLSCNT1 has counted the pulse P02, as shown in FIG. Pulse P0
2 is the number of pulses required to convey the original document at a distance L / 2 (see FIG. 28). Therefore, PLSCNT1 is pulse P
When 02 is counted (when the leading edge of the document reaches the intermediate position IP), the main motor M3 is turned off at SS5-4-17, and the status S is set to "3" at SS5-4-18. When PLSCNT1 is counting the pulse P02, the above-mentioned SS5-4-12 to SS5-4-15
To process.

When the status S is "3", nothing is processed as shown in FIG. As shown in FIG. 92, when the status S is "4" (completion of pre-feeding of the next document), the main motor M3 is rotated at high speed in SS5-4-19. As a result, the original document is transported to the exposure position and the subsequent document is transported to the pre-step position. And SS
If it is determined that the PLSCNT1 has counted the pulses P01 in 5-4-20, it is determined in SS5-4-21 whether the registration sensor SE2 is off, and it is determined in SS5-4-22 whether the empty sensor SE1 is on. judge. If the sensor SE2 is off and the sensor SE1 is on, that is, if the succeeding document has a small size and the next document remains on the tray 61, the paper feed status K is set to "3" at SS5-4-23.
, The main motor M3 is decelerated at SS5-4-26, the scale 120 is projected at SS5-4-27 (in the scale mode), and the status S is set at "5" at SS5-4-28. .

On the other hand, if the registration sensor SE2 is turned on, the succeeding document has a large size, and therefore SS5-4-
In step 25, the first-out prohibition flag is set to "1", and the above-mentioned S
Process S5-4-26-28. If the empty sensor SE1 is off, there is no next document, so SS5
At -4-24, the paper feed status K is set to "1", and the above SS5-4-26 to 28 are processed. PLSCNT
1 is counting the pulse P01 (SS5-
4-20 NO), SS5-4-12-15 are processed,
Detects the size of the following document.

When the status S is "5", as shown in FIG. 92, it is determined at SS5-4-29 whether or not the PLSCNT1 has counted the pulse P02. If YES, that is, if the leading edge of the preceding document reaches the exposure reference position SP and the leading edge of the following document reaches the intermediate position IP, the main motor M3 is turned off at SS5-4-30.
Subsequently, at SS5-4-31, the scale 120 is raised by the solenoid SL1, and at SS5-4-32, the flag DSET is set.
Is set to "1", and status S is set at SS5-4-33.
Is set to "6". When the flag DSET is "1", it indicates that the document has been set at the exposure position and is transmitted to the CPU1. In the copying machine main body 1, when the flag DSET is "1", the scanning operation of the optical system 20 becomes possible. When PLSCNT1 is counting the pulse P02, it processes SS5-4-12 to 15 described above.

When the status S is "6", as shown in FIG. 94, it is determined at SS5-4-34 whether the flag DCHG is "1", and the following processing is performed only when it is "1". . The flag DCHG is transmitted from the CPU 1 of the copying machine main body 1 in order to request the ADF 60 for document replacement.

If the flag DCHG is "1", SS5
At 4-35, the value of the paper feed status K is checked. Here, the following processing is performed only when the status K is "2" and "8". When the status K is "8" (when the next original has been fed in advance), the status K is set to "2" at SS5-4-36, and the flag LSIZE is "1" at SS5-4-37. Or not. Flag LSIZ
If E is "1" (if a large size document is fed), the status S is set to "1" at SS5-4-38, DCNT1 is decremented at SS5-4-39, and SS5 is set. At 4-40, DCNT3 for counting the number of documents to be discharged is set to "1". If the flag LSIZE is "0" (if a small size document is fed), the status S is set to "4" at SS5-4-41, and the above-mentioned SS5-4-39 to 40 are processed. To do.

The status K is "2" at SS5-4-35.
If it is determined that (the next original is not fed, that is, there is no next original or the first-out state), SS5-
At 4-42, it is determined whether DCNT1 is "0".
If "0", it is determined at SS5-4-43 whether or not the first-out prohibition flag is "1". If the first-out prohibition flag is "1", the flag LSIZE is set to "1" at SS5-4-44.
And set the status S to "7" at SS5-4-45.
And set SS5-4-39-40 as described above. If the first-out prohibition flag is "0", the above-mentioned SS5
-4-41, SS5-4-39-40 are processed. DC
If NT is not "0", the status S is set to "9" at SS5-4-46 and SS5-4-40 is processed.

When the status S is "7", as shown in FIG. 95, the main motor M3 is rotated at high speed in SS5-4-47. With this, the large-sized original is placed at the intermediate position IP.
Delivered from. And PLSC at SS5-4-48
It is determined whether NT1 has counted the pulse P03. When PLSCNT1 counts the pulse P03,
At SS5-4-49, it is determined whether or not the registration sensor SE2 is off, and at SS5-4-50, the empty sensor SE1.
It is determined whether or not is on. If the registration sensor SE2 is off and the empty sensor SE1 is on, the status K is set to "3" at SS5-4-51 for feeding the next document.
Set to. Further, the main motor M3 is decelerated at SS5-4-53, and the scale 120 is projected at SS5-4-54 (in the scale mode).
To set the status S to "8".

If the registration sensor SE2 is on,
At this time, the trailing edge of the large-sized document is still on the registration roller 9
Since 0 has not been passed, SS5-4-56 handles a paper jam. If the empty sensor SE1 is off, there is no next document, so the status K is set to "1" at SS5-4-52, and the above-mentioned SS5-4-53-5 are executed.
Process 5. When the PLSCNT1 is counting the pulse P03 (NO in SS5-4-48), the above SS5-4-12 to 15 are processed to detect the size of the document.

When the status S is "8", as shown in FIG. 96, it is determined at SS5-4-57 whether or not the PLSCNT1 has counted the pulse P04. If YES, that is, if the leading edge of the large-sized document reaches the exposure reference position SP, the main motor M3 is turned off at SS5-4-58. Then, at SS5-4-59, the solenoid SL1
Is turned on to cause the scale 120 to project upward from the upper surface of the platen glass 29, and at SS5-4-60, the flag DSET is set.
Is set to "1", and status S is set at SS5-4-61.
Is set to "6". PLSCNT1 pulse P04
During counting, SS5-4-53 to 5 described above
Process 5.

When the status S is "9", SS5-
At 4-62, the main motor M3 is normally rotated at high speed. As a result, the document is ejected from the exposure position. And SS5-
When the off edge of the discharge sensor SE3 is confirmed in 4-63, that is, when the trailing edge of the document separates from the conveyance belt 95,
The main motor M3 is turned off at SS5-4-64, and SS5
The solenoid SL1 is turned off at -4-65 and the scale 12
Increase 0. Then, at SS5-4-66, MODE
Is reset to "0", and the status S is reset to "0" at SS5-4-67.

The paper jam detection in the pre-step mode will be described. When the status S is "1", even if the registration sensor SE2 is on (SS5-
Does not handle paper jams (even if 4-4 is NO). However, when the status S is "7", the document is pulsed P0.
After the conveyance for 3 minutes, if the registration sensor SE2 is on (NO in SS5-4-49), the paper jam is processed.
That is, the pulse P03 is set to be slightly shorter than the distance L (see FIG. 28), and the determination of NO in SS5-4-49 is that the original is L (500 mm) or longer or the registration roller is defective due to poor conveyance. This is the case where the material stays in the vicinity of 90. In such a case, it is detected as a paper jam. When the status S is "4", the registration sensor SE
Even if 2 is ON (NO in SS5-4-21), the first-out prohibition flag is set to "1", but the paper jam is not processed. With the above processing, even in the pre-step mode, even if a large-sized original is mixed and set on the tray 61, the original can be conveyed without any trouble.

<< Scale >> FIG. 97 shows the scale (SS5-
4-27, SS5-4-54, SS5-6-33). Here, it is determined at SS5-4-101 whether or not the thin paper flag is "0", and if it is "0" (if the scale mode is selected), SS5-4-10.
At 2, the solenoid SL1 is turned on, the scale 120 is slightly projected onto the platen glass 29, and the document is forcibly stopped at the exposure reference position SP.

<< Main Motor High Speed Rotation >> FIG. 94 shows the main motor high speed rotation (SS5-4-2, SS5-4-19,
The subroutine of high speed forward rotation of the main motor M3 executed in SS5-4-62) is shown. Here, SS5-4-
In 201 and SS5-4-211, it is determined whether or not the main motor M3 is turned off. If it is already turned on, this subroutine is immediately ended. When it is determined in SS5-4-201 that it is off, that is, when the set status S is "1", "4", or "9", SS5-4-2.
At 02, the flag LSIZE is reset to "0", and SS5
-4-203 reset PLSCNT1 to "0",
The first and second erase flags are reset to "0" at SS5-4-204. Then, the first-out prohibition flag is reset to "0" at SS5-4-205, and SS5-4-
At 206, the flag DCHG is reset to "0" and SS5
The flag DSET is reset to "0" at -4-207. Further, the discharge status H is set to "1" at SS5-4-208, and the solenoid S is sent at SS5-4-209.
L1 is turned on, the scale 120 is lowered, and SS5-4-
At 210, the main motor M3 is set to high-speed forward rotation, and interruption is permitted. The main motor M3 is driven for each interrupt, and the PLSCNT1 and PLSCNT2 are counted. On the other hand, at SS5-4-211, the main motor M
3 is turned off, that is, when the set status S is "7", the above SS5-4-205-
Process 210.

<< 2-in-1 mode >> FIGS.
5 shows a 2-in-1 set subroutine executed in 5-6. In this subroutine, as shown in FIG. 99, SS
The status S is checked in 5-6-1 and its value is "0".
~ The following processing is performed based on "13". Status S
When is "0", nothing is processed. As shown in FIG. 100, when the status S is "1" (feeding completed), S
The main motor M3 is rotated at high speed in SS5-6-2.
As a result, the document is sent from the registration roller 90 onto the platen glass 29. Then, in SS5-6-3, it is determined whether or not the registration sensor SE2 is an off edge. If it is off-edge (if the trailing edge of the document passes the detection point of the sensor SE2), the size of the document is detected at SS5-6-4. Next, in SS5-6-5, the one-sheet set flag is determined. If the one-sheet set flag is "0", SS5-6-6
Then, it is determined whether or not the empty sensor SE1 is turned on. Register sensor SE2 is off edge and empty sensor S
If E1 is on, that is, if the fed document is of a small size and the next document remains on the tray 61, SS5-6-
The timer T202 for feeding the next original is set at 7, and the main motor M3 is decelerated at SS5-6-8.
The status S is set to "2" at 5-6-9.

On the other hand, when it is judged at SS5-6-6 that the empty sensor SE1 is off, that is, as a result of passing the paper,
If the number of the final original is one because there was an odd number of sheets, there is no next original, so the second half erase flag is set to "1" at SS5-6-10. The latter half erase flag instructs to erase the charges on the photosensitive drum 10 in the latter half scan area of the optical system 20 in the 2-in-1 mode. Then S
In S5-6-11, it is determined whether DCNT3 is "2",
If "2", that is, if the original to be discharged at this time is on the two-platen glass 29, the main motor M3 is decelerated at SS5-6-12, and the status S is set at "8" at SS5-6-13. ”. If DCNT3 is not "2", the status S is set to "5" at SS5-6-14.

At SS5-6-3, the registration sensor SE
If it is determined that 2 is not an off edge, SS5-6-15
Then, it is determined whether or not the PLSCNT1 has counted the pulse P05. The number of pulses P05 is larger than the number of pulses required for the small-sized document to pass through the recession sensor SE2, and if it is counted up to that point before the resistor sensor SE2 is turned off, it is a large-sized document, so SS5-6-
At 15, the flag LSIZE is set to "1", and the above-mentioned SS5-6-11 to 13 or SS5-6-14 is processed. If the one-sheet set flag is determined to be "1" in SS5-6-5, that is, if the number of originals is known to be an odd number in advance and the original is a small size, SS5 is set.
The status S is set to "12" in -6-17.

When the status S is "2", SS5-
At 6-18, it is determined whether the timer T202 has finished counting. After finishing counting, SS5-6-
If it is determined in 19 that the paper feed status K is "2",
Set status K to "3" at SS5-6-20,
Starts the advance feeding of the next document. If the timer T202 has not finished counting, or if it has finished counting, status K
If is not "2", PLSCNT in SS5-6-21
2 determines whether the pulse P07 has been counted. P
When LSCNT2 counts the pulse P07, SS5
At -6-22, the main motor M3 is switched to low speed reverse rotation. Here, the document starts switchback. Then, the status S is set to "3" at SS5-6-23.

When it is determined at SS5-6-21 that PLSCNT2 is counting the pulse P07, as shown in FIG. 102, when the off edge of the registration sensor SE2 is confirmed at SS5-6-27, SS5-6- At 28, the size of the document fed onto the platen glass 29 at that time is detected. Subsequently, when it is determined at SS5-6-29 that the empty sensor SE1 is on (if the original remains on the tray 61), DCNT1 is incremented at SS5-6-30.

When the status S is "3", FIG.
As shown in, it is determined whether or not the PLSCNT2 has counted the pulse P08 at SS5-6-24. When the counting is completed, the main motor M3 is turned off at SS5-6-25. This completes the document switchback. Then, the status S is set to "4" at SS5-6-26.
Set to. When the status S is "4", nothing is processed.

When the status S is "5" (the next original is sent from the registration roller 90), the main motor M3 is rotated at high speed in SS5-6-31 as shown in FIG. As a result, the switched-back original document and the subsequent original document are conveyed to the exposure position. Then, at SS5-6-32, PLSCNT1 outputs a pulse P03.
If it is determined that the count has been counted, the main motor M3 is decelerated at SS5-6-33, and the scale 1 is returned at SS5-6-34.
20 is projected (in scale mode).

Then, it is determined at SS5-6-35 whether the registration sensor SE2 is off or not, and at SS5-6-36 it is determined whether the empty sensor SE1 is on. Sensor S
If E2 is off and the sensor SE1 is on, that is, if the succeeding document has a small size and the next document remains on the tray 61, the paper feed status K is set to "3" at SS5-6-37. Then, the status S is set to "6" at SS5-6-38. Empty sensor SE with SS5-6-36
If 1 is determined to be off, there is no next document, so SS5-
In 6-39, the paper feed status K is set to "1", and the above-mentioned SS5-6-38 is processed.

The registration sensor SE2 at SS5-6-35
Is determined to be on, the flag LS is set in SS5-6-40.
It is determined whether or not SIZE is “0”, and if YES, it means that the large-sized original is set 2 in 1 after the small-sized original. Therefore, only the previous small-sized original is set in SS5-6-41. The second half erase flag is set to "1" in order to copy. Further, the first-out prohibition flag is set to "1" at SS5-6-42, and DCNT is set at SS5-6-43.
1 is incremented and the above-mentioned SS5-6-38 is processed. When it is determined in SS5-6-40 that the flag LSIZE is "1", the large-sized original document is independently sent to the position of the scale 120, but the registration roller 9 still does not.
Since it is staying near 0, SS5-6-
At 44, it is treated as a paper jam. When it is determined that the PLSCNT1 is counting the pulse P03 (SS5-6-3
2 is NO), and SS5-6-27 to SS5-6- described above.
30 (see FIG. 102) to detect the size of the subsequent document.

When the status S is "6", FIG.
As shown in, it is determined at SS5-6-45 whether PLSCNT1 has counted the pulse P04. If YES, that is, if the leading edge of the document reaches the exposure reference position SP, the main motor M3 is turned off at SS5-6-46. At this time, if the succeeding document has a large size, the second half of the document remains in the paper feed unit. Then SS5-6-
At 47, the solenoid SL1 is turned off to raise the scale 120, the flag DSET is set to "1" at SS5-6-48, and the status S is set to "7" at SS5-6-49.

When the status S is "8" (feeding a large-sized document), as shown in FIG. 105, SS5-6-5
When the PLSCNT1 confirms that the counting of the pulse P06 is completed at 0, the main motor M3 is turned off at SS5-6-51. Further, the status S is set to "9" at SS5-6-52.

When the status S is "9", SS5-
Only when it is determined that DCNT3 is "1" in 6-53 (when one document is ejected), the status S is set to "5" in SS5-6-54.

When the status S is "10", as shown in FIG.
As shown in 06, the main motor M is SS5-6-55.
Rotate 3 at high speed. This causes the document to be ejected from the exposure position. Then, at SS5-6-56, the emission sensor SE3
When the trailing edge of the document to be discharged is detected, that is, when the trailing edge of the document is separated from the conveyor belt 95, SS5-6-5
At 7, the main motor M3 is turned off. Thus, when two originals are ejected at the same time, the originals are separated from each other. Next, the solenoid SL1 is turned off at SS5-6-58 to raise the scale 120. In addition, SS5-6-
In 59, it is determined whether DCNT3 is "2". If it is "2", the status S is set to "11" in SS5-6-60, and if it is not "2" (the original to be ejected is one sheet. Only), reset the status S to "0" at SS5-6-61.

When the status S is "11", SS5
In -6-62, it is determined whether DCNT3 is "1",
If it is "1", the status S is set to "1" at SS5-6-63.
Set to 0 ". This causes the succeeding document to be ejected.
If DCNT3 is not "1", that is, if DCNT3 is "2", it means that the original has been ejected, and no processing is performed.

When the status S is "12", FIG.
The process shown in is executed. The status S is set to "12" when the one-sheet set flag is "1", that is, when the number of originals is an odd number, and only one final page original is set on the original glass 29. It's time to set. In this process, it is determined whether or not the pulse counter PLSCNT1 has reached (P04-size P) in SS5-6-64. Here, P04 is the number of pulses of the main motor M3 required to convey the document from the registration roller 90 to the scale 120. L + ADJ1 not including the applied amount α is set by SS-5-3-13. The size P is the number of pulses corresponding to the document size obtained by the document size detection. Therefore, when the pulse counter PLSCNT1 is (P04-size P), it means that the second document is set on the document table glass 29 at a distance of the document size from the scale 120.
Then, when PLSCN1 becomes (P04-size P),
Since the original is set on the original table glass 29 and separated from the scale 120 by the original size, SS5-6
The main motor M3 is turned off at -65. Next, SS5-
Turn off the solenoid SL1 at 6-66 to turn the scale 120
Then, the flag DSET is set to "1" in SS5-6-67, the first half erase flag is set to "1" in SS5-6-68, and the area where there is no document on the platen glass 29 is dealt with. After removing the electrostatic latent image on the photoconductor, the one-sheet set flag is reset to "0" at SS5-6-69. Subsequently, the sensor SE1 is SS5-6-70.
When it is turned on and it is confirmed that the document remains on the document tray 61, the DCNT1 is set to "+" at SS5-6-71.
1 "is incremented, the status K is set to" 3 "at SS5-6-72, and the status S is set to" 13 "at SS5-6-73. If it is confirmed in SS5-6-70 that there is no document on the document tray 61, SS5-
6-74 sets the status K to "1". Thus, when the number of originals is an odd number, the final original is set at a position distant from the scale 120 by the size of the original from the exposure reference SP on the original glass 29-that is, the intermediate position IP. Here, since one small size original is set in the second half, the first half erase flag is set to half erase the first half. Even if the number of odd-numbered sheets is counted and the one-sheet set flag is set, if the original is a large size at the time of actual copying, the process proceeds from SS5-6-15 to SS5-6-16. It will be set alone and will not be erased. As a result of passing the sheet to the end, when there is only one last document, the latter half erase flag is set to set on the scale side (SS-5-6-10). Even when the small-sized original and the large-sized original are two-in-one, only the small-sized original on the scale side is copied, and the latter half of the erase flag is set to erase the large-sized original. And
The large-sized original is then subjected to a copy process so that the entire copy is made, and there is no extra copy or the shadow or dirt of the belt is reflected in the margins, and there is no image loss. Is obtained.

In FIG. 108, the status S is "7" or "1".
3 ”is shown. Here, SS5-6-75
It is determined whether or not the flag DCHG is "1", and only when it is "1", the following processing is performed. If the flag DCHG is "1", the value of the paper feed status K is checked at SS5-6-76. Here, the following processing is performed only when the status K is "2" and "8".

When the status K is "8" (when the next original has been fed in advance), the status K is set to "2" at SS5-6-77 and the status S is set at SS5-6-78. Set to "1". Furthermore, SS5-6-7
In step 9, DCNT1 is decremented, and in step SS5-6-80, it is determined whether the flag LSIZE is "1". Flag L
If SIZE is "1" (if a large size document is fed), DCNT3 for counting the number of documents to be discharged is incremented in SS5-6-81. If the flag LSIZE is "0" (if a large-size document is fed), it is determined at SS5-6-82 whether the latter half erase flag is "1". If the second half erase flag is "1" (one small-sized original is being set or one small-sized original and one large-sized original are being set), the above-mentioned SS5-6-81 is processed, If it is "0", it is determined in SS56-83 whether the first half erase flag is "1". If the first half erase flag is "0", the SS is SS.
After incrementing DCNT3 at 5-6-84, S
Process S5-6-81.

The status K is "2" at SS5-6-76.
If it is determined (when the next original is not fed in advance), it is determined in SS5-6-85 whether the advance inhibition flag is "1". If the first-out prohibition flag is "1",
The flag LSIZE is set to "1" at SS5-6-86, the status S is set to "5" at SS5-6-87, and SS5-6-79 to 84 are processed. If the first-out prohibition flag is "0", the status S is set to "10" at SS5-6-88, and SS5-6-80 to 84 are processed.

<< Paper Discharge >> FIGS. 109 to 111 show SS5-5.
5 shows a subroutine for counting paper discharge executed in 5-7 and 5-11. The paper discharge here is the pre-step mode and 2
The paper is discharged in the in-1 mode. In this subroutine,
As shown in FIG. 109, the paper discharge status H is checked at SS5-5-1, and the following processing is performed based on the values "0", "1", and "2".

As shown in FIG. 106, when the status H is "0", nothing is processed. When the status H is "1", the discharge motor M4 is driven at high speed in SS5-5-2, it is determined in SS5-5-3 whether or not the main motor M3 is off, and in SS5-5-4, the DCNT3 is turned on. It is determined whether it is "0". The main motor M3 is off,
If DCNT3 is "0", there is no original to be ejected,
At SS5-5-5, the discharge motor M4 is turned off, and SS5-5
The status H is reset to "0" at -6.

If the main motor M3 is on, or if it is off but DCNT3 is not "0" (during document discharge), it is determined at SS5-5-7 whether the discharge sensor SE3 is off edge. If the sensor SE3 is off-edge, that is, if the trailing edge of the document passes the detection point of the sensor SE3, the discharge motor M4 is switched to low speed driving at SS5-5-8, and the timer T301 is set at SS5-5-9. To do. Furthermore, the status H is set to "2" at SS5-5-10.
Set to.

When the status H is "2", FIG.
As shown in FIG.
When the end of counting is confirmed, SS5-5-12 D
Decrement CNT2 and DCN at SS5-5-13
Decrement T3. Then, it is determined at SS5-5-14 whether DCNT3 is "0". If DCNT3 is "0", that is, if there is one document to be discharged, the discharge motor M4 is turned off at SS5-5-15, and SS
The status H is reset to "0" at 5-5-16.
If DCNT3 is not "0", that is, if there are two documents to be discharged, the status H is set to "1" at SS5-5-17, and the discharging operation is continued.

<< Count >> FIGS. 112 to 114 show SS5-
8 shows a count subroutine executed in 8. In this case, a count discharge routine, which will be described below, completes one cycle of the original document and automatically counts the number of sheets. In this subroutine, as shown in FIG. 112, SS5-8-1
The status S is checked with and the following processing is performed based on the value "0" to "4".

As shown in FIG. 113, when the status S is "0", nothing is processed. When the status S is "1" (feeding is completed), it is confirmed in SS5-8-2 that the discharge status H is not "2", that is, if the discharge motor M4 is not decelerated, SS5- 8-3
Then, the solenoid SL1 is turned on to lower the scale 120, and the main motor M3 is normally rotated at high speed at SS5-8-4. As a result, the document is sent from the registration roller 90 onto the platen glass 29. In addition, PLSCNT1 is reset to "0" at SS5-8-5, and SS5-8-6
Sets the status S to "2", and SS5-8-7 sets the status H to "1".

When the status S is "2", SS5-
When the off edge of the registration sensor SE2 is confirmed in 8-8 (when the trailing edge of the document passes the detection point of the sensor SE2), the size of the document is detected in SS5-8-9. Then, the main motor M3 is decelerated at SS5-8-10, and S
In S5-8-11, GCNT for counting the number of originals is incremented, and in PLSSCNT8-12, PLSCNT2 is reset to "0". Further, it is determined at SS5-8-13 whether or not the empty sensor SE1 is on. If the sensor SE1 is on, the next document is fed, so SS
5-8-14 increments DCNT1 and SS5
At -8-15, set the paper feed status K to "3", and press S
In step S5-8-16, the status S is set to "3".
If the sensor SE1 is off, there is no next original on the tray 61, so the paper feed status K is set to "1" at SS5-8-17, and the status S is set to "3" at SS5-8-16. set.

When the status S is "3", FIG.
As shown in, when it is confirmed that the PLSCNT2 has finished counting the pulse P09 in SS5-8-17, S5
The main motor M3 is turned off in S5-8-18. The pulse P09 is for temporarily stopping the original on the platen glass 29, and corresponds to the number of main motor drive pulses from when the trailing edge of the original is detected by the registration sensor SE2 to when it passes through at least the nip portion of the registration roller 90. .
By such control, the processing time in the count mode is shortened.

Next, at SS5-8-19, the solenoid SL
After turning off 1 and raising the scale 120, SS5-
At 8-20, it is determined whether the discharge sensor SE3 is off, and S
In S5-8-21, it is determined whether the paper discharge status H is not "2". If the sensor SE3 is off and the status H is not "2" (if the document is not ejected), S
At S5-8-22, the discharge motor M4 is turned off, and SS5-8
The status H is reset to "0" at -23. Then, it is determined at SS5-8-24 whether the empty sensor SE1 is on or off. If the sensor SE1 is on, the status S is reset to "0" at SS5-8-25 to wait for the completion of feeding of the next document, and if the sensor SE1 is off, at SS5-8-26. Set the status S to "4". If the status H is “2” even if the discharge sensor SE3 is on or off, S
S5-8-24-26 are processed.

When the status S is "4", it means that all the originals have been sent onto the platen glass 29, and SS
The main motor M3 is driven at a low speed at 5-8-27. Then, if it is confirmed in SS5-8-28 that DCNT2 is "0", that is, if there is no document on the platen glass 29, in SS5-8-29, the main motor M3 is selected.
Is turned off, the solenoid SL1 is turned off at SS5-8-30 to raise the scale 120, and the status S is reset to "0" at SS5-8-31. Next, SS5-8-
At 32, it is determined whether GCOUNT, that is, whether the number of originals is an odd number, and if it is an odd number, the one-sheet set flag is set to "1" at SS5-8-33.

<< Count Paper Ejection >> FIG. 115 shows the count paper ejection subroutine executed in SS5-9. In this subroutine, the paper discharge status H is checked at SS5-9-1 and the following processing is performed based on the values "0", "1", and "2". When the status H is "0", nothing is processed. When the status H is "1" (when the conveyance of the document is started by the normal rotation of the main motor M3), S
The discharge motor M4 is driven at high speed in S5-9-2. As a result, the reversing roller 100 and the discharge roller 110 rotate, and the original is sent to the tray 115. Next, SS5-9
When the off edge of the discharge sensor SE3 is confirmed in -3 (when the trailing edge of the document passes the detection point of the sensor SE3),
The discharge motor M4 is decelerated at SS5-9-4. further,
Set the timer T301 at SS5-9-5 and SS5-
Set the status H to "2" at 9-6 and SS5-9
Decrement DCNT2 at -7.

When the status H is "2", SS5-
When it is confirmed in 9-8 that the timer T301 has finished counting, the discharge motor M4 is turned off in SS5-9-9, and SS5 is set.
At -9-10, it is determined whether DCNT2 is "0". D
If CNT2 is "0" (if there is no document on the platen glass 29), the status H is reset to "0" at SS5-9-11. If DCNT2 is not "0" (if there is a document on the platen glass 29), SS5-9
The status H is set to "1" at -12.

<< Size Detection >> FIG. 112 shows a size detection subroutine. Here, the pulse count value of PLSCNT1 is stored in the size detection counter SIZCNT1 at SS5-4-201. PLSCNT1 counts the number of forward rotation drive pulses of the main motor M3, and the value corresponds to the length of the document. Next, at SS5-4-202, it is determined whether the width flag is "1". The width flag is set by turning on and off the width sensor SE10.
E10 is turned on by a document having a width dimension of B5 horizontal feed or more, and the width flag is set to "1". The size of the document is set by the combination of the value of SIZCNT1 and the width flag. In the figure, T means horizontal feed and L means vertical feed.

That is, when the width flag is "1", SS5
The value of SIZCNT1 is checked at -4-203, and if the value corresponds to 182 mm, it is SI at SS5-4-204.
Set ZE to B5 traverse. The same applies to SIZCN
According to the value of T1, SS5-4-205 to SS5-4-
At 207, a predetermined document size is set in SIZE. If the length is longer than 420 mm, SS5-4-208 is unclear. After that, the width flag is reset to "0" at SS5-4-209.

On the other hand, when the width flag is "0",
As shown in FIG. 7, SS5-4-210 is used for SIZCNT1.
Check the value of SS5-4-211 according to that value
A predetermined document size is set in SIZE at SS5-4-217. If it is shorter than 297 mm, SS5-4
-213, it is determined whether or not the switch SW2 is turned on, and if it is turned on, the size is set to "A4L" at SS5-4-214, and if not turned on, SS5-
Set the size to "Letter L" with 4-215. In the 2-in-1 mode, the detected size is set as twice the size. Where SS5-
4-213 and 214 are other examples of the processing after S8-4 of FIG.

<< Double-sided setting >> FIGS. 118 to 124 are subroutines for processing the document conveyance in the double-sided mode.
The status "S" is determined in S5-10-1, and the process branches to "0" to "6" according to the value.

If the status S is "0", nothing is done. When the status S is "1", as shown in FIG. 119, the solenoid SL1 is turned on at SS5-10-2 to lower the scale 120, and the main motor M3 is normally rotated at SS5-10-3 to rotate the document table. The original is conveyed along the glass 29, and the paper discharge motor M4 is driven at SS5-10-4. Next, in SS5-10-5, the off-edge of the registration sensor SE2 is detected. When the off-edge, that is, the trailing edge of the document is detected, SS5-10-6 detects the document size from the signals of the sensors SE2 and SE10. Then, SS5-10
At -7, it is determined whether the document number counter DCNT3 is "0". This original number counter is a counter for counting the number of sheets to be ejected, and is set to "0" when the back side and front side of the first sheet are set. Further, when the back side of the second and subsequent sheets is set, "1" changes to "0" when the previous document is ejected. When the document number counter DCNT3 is determined to be "0", the on edge of the discharge sensor SE3 is detected at SS5-10-8, and when this on edge is detected, S
In S5-10-9, the solenoid SL2 is turned on and the switching claw 1
03 is operated to form an inversion path, and the original is conveyed again toward the original platen glass 29. In addition, PLSCNT2 is reset to "0" at SS5-10-10, and counting is started from there. Status S at SS5-10-11
Is set to "2".

When the status S is "2", PLSCNT2 is set to P in SS5-10-12 as shown in FIG.
It is determined whether or not the number becomes 12, that is, whether or not the leading edge of the document passing through the sensor SE3 has passed through the reversing path and has arrived just before the conveyance belt 95. Immediately before the leading edge of the document reaches the conveyor belt 95, the main motor M3 is rotated in reverse at SS5-10-13. Further, at SS5-10-14, it is determined whether or not the document is a large size document, and if it is a large size document, the motor M
Decelerate 3 and M4. This is because in the case of a large-sized document, the leading edge and the trailing edge of the original are both the transport belt 95 and the document glass 2
It may be held between 9 and the load becomes large. In such a case, the motors M3 and M4 are switched to low speed to prevent stepping of the stepping motor and to reduce the paper passing sound. At this time, the scale 120 is attached to the platen glass 29.
Even if it is lowered from the upper surface, the same effect can be obtained. On the other hand, if the original is not a large-sized original, SS5-1
The solenoid SL1 is turned off at 0-20 to scale 120.
To prevent jamming due to the document leading edge interfering with the glass end face and preparing for the document leading edge regulation. Then S
In S5-10-16, the sensor SE3 and the off-edge are detected, and when it is confirmed that the trailing edge of the document has passed the switching claw 103, the solenoid SL2 is turned off in SS5-10-17 to operate the switching claw 103. The document transport path is switched to the path toward the document discharge tray 115, and SS5-10-18
PLSCNT2 is reset to "0" by SS5-10
The status S is set to "3" at -19.

When the status S is "3", as shown in FIG. 121, whether PLSCNT2 has become P14,
That is, the trailing edge of the original is 20 to 30 mm from the scale 120.
Move to a distant position and completely copy the original on the platen glass 29.
Check if you have moved up. And PLSCNT2
Becomes P14, SS5-10-22 is the main motor M
3 is switched to the normal rotation state. As a result, the document is conveyed on the platen glass 29 toward the scale 120.
Further, the discharge motor M4 is turned off at SS5-10-23. Next, at SS5-10-24, PLSCNT2 is reset to "0", and at SS5-10-25, the solenoid SL1 is turned off to raise the scale 120 to prepare for the leading edge regulation of the document. Finally, the status S is set to "4" at SS5-10-26.

When the status S is "4", as shown in FIG. 122, PLSCNT2 is set to P in SS5-10-27.
It is determined whether the number is 16, that is, whether the document is conveyed until the end portion of the scale 120 is regulated by the scale 120.
If PLSCNT2 reaches P16, SS
The main motor M3 is turned off at 5-10-28, and SS5-
At 10-29, set DSET to "1" and return the pickup roller to the home position. SS5-10-3
At 0, it is determined whether the front side of the document is set to the copy state or the back side of the document is set to the copy state. Here, if the copy state of the front side of the document is set, SS5
At -10-31, it is detected whether or not there is the next document on the document tray 61, and if there is, at SS5-10-32, the document counter D is detected.
After setting CNT1 to "1", SS5-10-33
To set the status K to "3" and feed the next original. If there is not, set the status K to "1" at SS5-10-34 and set the status S at SS5-10-35.
Is set to "5". When it is determined in SS5-10-30 that the back side of the document is set to the copy state,
Without executing the processing of SS5-10-31 to 34,
The status S is set to "5" at SS5-10-35.

When the status S is "5", as shown in FIG. 123, it is determined at SS5-10-36 whether or not the document replacement request signal DCHG is set to "1" in the copying machine main body 1. Further, it is determined at SS5-10-37 whether or not the original has been set to the front side copying state. And DC
If HG is set to "1", the original needs to be replaced, and the original is set to the front side copy state, SS5-1
The paper discharge control counter H is set to "1" at 0-38, and S
Document number counter DCNT ejected in S5-10-39
3 is set to "1", and it is determined at SS5-10-40 whether the status K is set to "8", that is, whether the next document is set to the first-out state, and the next document is If it is in the first-out state, SS5-10-4
Change the status K to "2" in 2 and SS5-10-4
Decrement DCNT1 at 2. Also, SS5-1
The status S is set to "1" at 0-43, and SS5-
10-44 sets DCHG to "0", and SS5-10-45 sets DSET to "0". On the other hand, SS5-10-
When it is determined that the status K is not "8" at 40, the solenoid SL1 is turned on to lower the scale 120, and S
In S5-10-47, the main motor M3 is driven to discharge the original on the original platen glass 29 to the paper output unit, and SS5-10-
At 48, the status S is set to "6" to start the discharge process of the final document. At SS5-10-44, DCHG is set to "0", and at SS5-10-45, DSET is set to "0". If it is determined in SS5-10-37 that the document is set in the backside copy state, SS5-10-43 to
45 is executed.

When the status S is "6", as shown in FIG. 124, at SS5-10-49, the off edge of the paper discharge sensor SE3, that is, the document trailing edge detection signal is detected, and the off edge is detected and the document trailing edge is detected. When it is confirmed that the section has passed the sensor SE3, the main motor M3 is turned off at SS5-10-50, and the solenoid S is turned on at SS5-10-51.
L1 is turned off and the scale 120 is raised. Next, SS
5-10-52, whether the discharge control counter H is "0",
That is, it is determined whether or not the document is completely discharged, and when the discharge is completed, the MODE is set to "0" in SS10-53,
The status S is set to "0" at SS5-10-54 to set the standby state.

<Input Processing> FIG. 125 shows the control of the input processing S3 of the CPU 1. In this input processing S3, FIG.
The input from the copier operation unit shown in is processed. In the operation section of the copying machine, 100 is a copy start key, 101
Is a 10 key, 102 is a clear / stop key, 103 is a reset key, and 104 is a display unit. Reference numeral 105 is an original selection key, and 105a is a thin paper mode display LED. The thin paper mode display portion is lit when the thin paper mode is selected by the original selection key 105. 106 is a mode selection key, 106a
Is a double-sided mode display LED, 107b is a 2-in-1 mode display LED, 106c is a count mode display LED, and the mode selected by the mode selection key 106 is displayed by the display LEDs 106a, 106b, 106c, respectively.

In the input processing, when the on-edge of the document selection key 105 is detected in S3-1, it is determined in S3-2 whether or not the thin paper mode display LED 105a is in the ON state, and L
If the ED 105a is on, the LED 105 is turned on in S3-3.
a is turned off to set the copy state of the normal document, and if it is off, the LED 105a is turned on in S3-4 to set the copy state of the thin paper document.

If the on-edge of the document selection key 105 is not detected in S3-1, the mode selection key 10 is selected in S3-5.
On edge of 6 is detected. Here, if the on-edge is not detected, other key input processing is executed in S3-8. On the other hand, when the on-edge is detected in S3-5, S
LED 106 in 3-6, S3-9, and S3-11, respectively.
a, the LED 106b, and the LED 106c are in the ON state, and if the LED 106a is in the ON state, L is set in S3-7.
If the ED 106a is turned off and the LED 106b is turned on to set the 2-in-1 mode, and the LED 106b is in the on state, S
In 3-10, the LED 106b is turned off and the LED 106c is turned on to set the count mode. If the LED 106c is in the on state, the LED 106c is turned off in S3-12. If the LED 106c is in the off state, the LED 106c is turned on in S3-13 to enter the double-sided mode. Set.

<< Display Processing >> FIG. 127 is a subroutine for controlling the display of the display section 104 in the operation section of the copying machine.
In S4-1, it is determined whether or not the forget-to-take flag 1 is set to "1". If the forget-to-take flag 1 is set, the sheet jam indicator 104 is displayed on the display unit 104 in S4-2.
Display a. Next, in S4-3, it is determined whether or not the forget-to-take flag 2 is set to "1", and if the forget-to-take flag 2 is set to "1", the display unit 104 displays the discharge unit jam display 104b. Is displayed. If the forget-to-take flag 1 or 2 is set to "1", the display unit 1
In 04, the removal of jammed paper is notified as shown in the figure. Furthermore, in S4-5, other necessary displays are processed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an automatic document feeder (ADF) equipped with an automatic paper feeder according to the present invention and a copying machine main body.

FIG. 2 is a cross-sectional view showing the internal structure of an ADF.

FIG. 3 is a sectional view of a first embodiment of the scale pressing mechanism,
The position of the scale when the conveyor belt is separated from the platen glass is shown.

FIG. 4 is a cross-sectional view showing a first embodiment of the scale pressing mechanism, showing a state where the scale is raised.

FIG. 5 is a sectional view of the scale pressing mechanism according to the first embodiment, showing a state where the scale is descending.

FIG. 6 is a sectional view of the scale pressing mechanism according to the first embodiment, showing a state in which the scale is lowered.

FIG. 7 is a side view showing a second embodiment of the scale pressing mechanism, showing a state where the scale is raised.

FIG. 8 is a partial plan view of a scale pressing mechanism according to a second embodiment.

FIG. 9 is a sectional view of a lever member of a scale pressing mechanism according to a second embodiment.

FIG. 10 is a sectional view of a lever member of a scale pressing mechanism according to a second embodiment.

FIG. 11 is a side view of the scale pressing mechanism according to the second embodiment, showing a state where a solenoid in operation is pressing the scale.

FIG. 12 is a side view of the scale pressing mechanism according to the second embodiment, showing a state where the solenoid plunger is completely retracted.

FIG. 13 is a side view showing a third embodiment of the scale pressing mechanism.

FIG. 14 is a side view showing a fourth embodiment of the scale pressing mechanism.

FIG. 15 is an explanatory diagram of a plane positional relationship between the leading end of the scale, the notch of the film, and the separation roller.

FIG. 16 is a cross-sectional view of a document feeding unit in the ADF.

FIG. 17 is a front view showing a supporting state of a pressing plate in a document feeding section.

FIG. 18 is a perspective view showing a drive mechanism of a leading edge regulating plate and a pressing plate in the document feeding section.

FIG. 19 is an explanatory diagram showing a state in which the leading end regulating plate shown in FIG. 18 is in a regulating position and the pressing plate is in a non-pressing position.

FIG. 20 is an explanatory diagram showing a state in which the leading end regulating plate shown in FIG. 18 is in a non-regulating position and the pressing plate is in a non-pressing position.

FIG. 21 is an explanatory diagram showing a state in which the tip regulation plate shown in FIG. 18 is in a non-regulation position and the pressing plate is in a pressing position.

FIG. 22 is a perspective view showing a drive mechanism for a registration roller and a conveyor belt.

FIG. 23 is an explanatory diagram of a planar positional relationship between a registration roller and a separation roller.

FIG. 24 is a perspective view of a registration roller support mechanism and a paper passage opening / closing mechanism.

25 is an explanatory diagram of a relationship between a registration roller and a cam in the paper passage opening / closing mechanism of FIG. 24.

FIG. 26 is an operation explanatory view of the paper path opening / closing mechanism of FIG. 24.

27 is an operation explanatory view of the paper passage opening / closing mechanism of FIG. 24.

FIG. 28 is a schematic explanatory diagram of a mechanism that supports a cover of a document feeding unit.

FIG. 29 is an explanatory diagram of document transportation by a stepping motor and shows a case where the document is stopped in the pulse control mode.

FIG. 30 is an explanatory diagram of document transportation by a stepping motor and shows a case where the document is stopped in the scale mode.

FIG. 31 is an explanatory diagram of document transportation in a prestep mode.

32 is an explanatory diagram of document conveyance in the pre-step mode subsequent to FIG. 31. FIG.

FIG. 33 is an explanatory diagram of document conveyance in a pre-step mode subsequent to FIG. 32.

34 is an explanatory diagram of document conveyance in the pre-step mode subsequent to FIG. 33. FIG.

FIG. 35 is an explanatory diagram of document conveyance in a pre-step mode subsequent to FIG. 34.

FIG. 36 is an explanatory diagram of document conveyance in a pre-step mode subsequent to FIG. 35.

FIG. 37 is an explanatory diagram of document conveyance in a pre-step mode subsequent to FIG. 36.

FIG. 38 is an explanatory diagram of document conveyance in the pre-step mode subsequent to FIG. 37.

FIG. 39 is an explanatory diagram of document conveyance in a pre-step mode subsequent to FIG. 38.

FIG. 40 is an explanatory diagram of document transportation in the 2-in-1 mode.

FIG. 41 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 40.

FIG. 42 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 41.

FIG. 43 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 42.

FIG. 44 is an explanatory diagram of document transportation in the 2-in-1 mode following FIG. 43.

FIG. 45 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 44.

FIG. 46 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 45.

FIG. 47 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 46.

FIG. 48 is an explanatory diagram of document transportation in the 2-in-1 mode following FIG. 47.

FIG. 49 is an explanatory diagram of document conveyance in the 2-in-1 mode following FIG. 48.

FIG. 50 is an explanatory diagram of document transportation in the 2-in-1 mode following FIG. 49.

51 is an explanatory diagram of document conveyance in the 2-in-1 mode, following FIG. 50.

FIG. 52 is an explanatory diagram of document transportation in the double-sided mode.

FIG. 53 is an explanatory view of document conveyance in the double-sided mode following FIG. 52.

FIG. 54 is an explanatory view of document conveyance in the double-sided mode following FIG. 53.

FIG. 55 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 54.

FIG. 56 is an explanatory view of document conveyance in the double-sided mode following FIG. 55.

FIG. 57 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 56.

FIG. 58 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 57.

FIG. 59 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 58.

FIG. 60 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 59.

FIG. 61 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 60.

FIG. 62 is an explanatory view of document conveyance in the double-sided mode following FIG. 61.

FIG. 63 is an explanatory diagram of document conveyance in the double-sided mode following FIG. 62.

FIG. 64 is a block diagram showing a control unit of the copying machine main body.

FIG. 65 is a block diagram showing a control unit of the ADF.

FIG. 66 is a flowchart showing a main routine of the CPU 1 which controls the main body of the copying machine.

FIG. 67 is a flowchart showing a subroutine of APS control in the CPU 1.

68 is a flowchart showing a document stop position processing subroutine in CPU 1. FIG.

FIG. 69 is a flowchart showing an erase subroutine in the CPU 1.

FIG. 70 is a flowchart showing a scan subroutine in the CPU 1.

FIG. 71 is a flowchart showing a main routine of the CPU 2 controlling the ADF.

72 is a flowchart showing a subroutine of interrupt processing in the CPU 2. FIG.

FIG. 73 is a flowchart showing an initial setting subroutine in the CPU 2.

FIG. 74 is a flowchart showing a home check subroutine in the CPU 2.

FIG. 75 is a flowchart showing a subroutine for opening / closing check in the CPU 2.

FIG. 76 is a flowchart showing a subroutine for forgetting to check in the CPU 2.

77 is a flowchart showing a speed setting subroutine in the CPU 2. FIG.

FIG. 78 is a flowchart showing a speed setting subroutine in the CPU 2 subsequent to FIG. 76;

FIG. 79 is a relationship diagram of time and pulse speed showing pulse control of the main motor.

FIG. 80 is a flowchart showing a document replacement subroutine in the CPU 2.

FIG. 81 is a flowchart showing a start check subroutine in the CPU 2.

FIG. 82 is a flowchart showing a subroutine for setting the feed amount in the CPU 2.

FIG. 83 is a flowchart showing a paper feeding subroutine in the CPU 2.

84 is a flowchart showing a paper feeding subroutine following FIG. 83.

FIG. 85 is a flowchart showing a paper feeding subroutine continued from FIG. 84;

FIG. 86 is a circuit diagram of a main motor (stepping motor).

FIG. 87 is a time chart showing control of the main motor (stepping motor).

FIG. 88 is a flowchart showing a paper feeding subroutine continued from FIG. 87;

FIG. 89 is a flowchart showing a pre-step setting subroutine in the CPU 2.

90 is a flowchart showing the pre-step setting subroutine in the CPU 2 following FIG. 89. FIG.

FIG. 91 is a flowchart showing the pre-step setting subroutine in the CPU 2 subsequent to FIG. 90;

FIG. 92 is a flowchart showing a pre-step setting subroutine in the CPU 2 following FIG. 91.

FIG. 93 is a flowchart showing a pre-step setting subroutine in the CPU 2 subsequent to FIG. 92;

94 is a flowchart showing a pre-step setting subroutine in the CPU 2 following FIG. 93.

FIG. 95 is a flowchart showing a pre-step setting subroutine in the CPU 2 following FIG. 94.

96 is a flowchart showing the pre-step setting subroutine in the CPU 2 following FIG. 95.

FIG. 97 is a flowchart showing a scale subroutine in the CPU 2.

FIG. 98 is a flowchart showing a main motor control subroutine in the CPU 2.

FIG. 99 is a flowchart showing a 2-in-1 set subroutine in the CPU 2.

100 is a 2-in-1 CPU 2 following FIG. 99;
The flowchart which shows the subroutine of setting.

101 is a flowchart showing a 2-in-1 set subroutine in the CPU 2 following FIG. 100;

102 is a flowchart showing a 2-in-1 set subroutine in the CPU 2 subsequent to FIG. 101; FIG.

103 is a flowchart showing a 2-in-1 set subroutine in the CPU 2 following FIG. 102; FIG.

FIG. 104 is a flowchart showing a 2-in-1 set subroutine in the CPU 2, following FIG. 103;

105 is a flowchart showing a 2-in-1 set subroutine in the CPU 2 following FIG. 104. FIG.

FIG. 106 is a flowchart showing a 2-in-1 set subroutine in the CPU 2, following FIG. 105;

FIG. 107 is a flowchart showing a 2-in-1 set subroutine in the CPU 2 following FIG. 106;

FIG. 108 is a flowchart showing a 2-in-1 set subroutine in the CPU 2, following FIG. 107;

FIG. 109 is a flowchart showing a paper discharge subroutine in the CPU 2.

110 is a flowchart showing a paper discharge subroutine in CPU 2 subsequent to FIG.

111 is a flowchart showing a paper discharge subroutine in CPU 2 following FIG. 109. FIG.

FIG. 112 is a flowchart showing a count subroutine in the CPU 2.

113 is a flowchart showing a count subroutine in the CPU 2 following FIG. 112.

114 is a flowchart showing the counting subroutine in the CPU 2 following FIG. 113. FIG.

FIG. 115 is a flowchart showing a count discharge subroutine in the CPU 2.

FIG. 116 is a flowchart showing a size detection subroutine in the CPU 2.

FIG. 117 is a flowchart showing a size detection subroutine in CPU 2 following FIG. 115.

FIG. 118 is a flowchart showing a double-sided setting subroutine in the CPU 2.

FIG. 119 is a flowchart showing a double-sided setting subroutine in the CPU 2 subsequent to FIG. 118.

120 is a flowchart showing a double-sided setting subroutine in the CPU 2 subsequent to FIG. 119. FIG.

121 is a flowchart showing a subroutine for double-sided setting in the CPU 2 following FIG. 120. FIG.

122 is a flowchart showing a double-sided set subroutine in the CPU 2 following FIG. 121. FIG.

123 is a flowchart showing a subroutine for double-sided setting in the CPU 2 following FIG. 122.

FIG. 124 is a flowchart showing a double-sided setting subroutine in the CPU 2 subsequent to FIG. 123;

FIG. 125 is a flowchart showing a subroutine of input processing in the CPU 1.

FIG. 126 is a plan view showing the key arrangement and the like of the copying machine operating section.

FIG. 127 is a flowchart showing a display processing subroutine in the CPU 1.

[Explanation of symbols]

1 ... Copier, 60 ... Automatic Document Feeder (ADF), 29
... Platen glass, 120 ... Scale.

Claims (1)

[Claims] 1. A paper feeding means for feeding the originals one by one, a conveying means for conveying the fed originals to an exposure position of a copying machine, a drive transmitting means for transmitting a driving force to the conveying means, and a driving means. A stepping motor for giving a driving force to the transmission means, and a control means for driving the stepping motor before the document is conveyed by the number of pulses corresponding to the backlash from the stepping motor to the conveying means and the number of pulses required for phase matching of the stepping motor. And an automatic document feeder.