JP3248338B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine having an automatic document feeder. In particular, the load on the motor for conveying a document provided in the automatic document feeder is reduced so that a stable document conveyance is achieved.

[0002]

2. Description of the Related Art Conventionally, a copying machine equipped with an automatic document feeder has been known. This automatic document feeder generally includes a document feeder that feeds the documents placed on a document tray one by one, and feeds the fed documents along the upper surface of the platen glass. The document feeder includes a document feeder that stops a document at a predetermined position on a table glass, and a document discharge unit that discharges a document sent from the platen glass after exposure to a document discharge tray. Further, the automatic document feeder includes:
The original sent from the original tray is temporarily stopped in a state where the original forms a loop, and is sent out onto an original platen glass in synchronization with the end of the image forming process of the copying machine body.
In addition, a document reversing section, for example, an annular document reversing path is provided for copying a two-sided document, and the document sent out from the platen glass is transported to the document reversing path to be turned upside down and sent again to the platen glass. There is something that has been put back.

[0003]

In the automatic document feeder having such a configuration, a motor is provided to form a loop in the document feeder and convey the temporarily stopped document onto the platen glass. When driven, no load is applied when the loop is eliminated, but a large load is applied to the motor as soon as the loop is eliminated. In particular, when a stepping motor is used as a drive source, the step-out occurs and the original transport distance is deviated. Furthermore, if the length of the document inversion path from the original platen glass to the original platen glass until it is sent back to the original platen glass again is shorter than the length of the original in the transport direction, the edge of the original platen glass or the original The leading edge and the trailing edge of the original are sandwiched between the original position regulating scale and the original transport section that are arranged along the edge of the base glass. Excessive load is applied. Particularly, in the case of a document in which the document is folded in two, there is a problem that a particularly large load is applied due to interference between the folded portion and the tip of the scale.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the load on a document conveying motor in an automatic document feeder.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in accordance with the above-mentioned object, and comprises a copying machine main body provided with a document positioning scale on an upstream or downstream side of a document table glass in a document conveying direction; Automatically feeds the document placed on the document feeder onto the platen glass, covers the glass, stops one end of the document by touching the scale, and sends the document from the platen glass to the document discharge unit after exposure. In a copier equipped with a document feeder, a document reversing section for reversing the document sent out from the platen glass and sending it back to the platen glass, and the length of the document in the document conveying direction passes through the scale. If the original is longer than the distance from the original reversing section until it is conveyed to the scale again, the scale is placed on the platen glass just before the leading edge of the original that passed through the original reversing section reaches the scale. Control means for temporarily retracting below the original, and when the length of the original in the original transport direction is shorter than the above distance, raising the scale above the original platen glass; Is provided.

[0006]

[0007]

[0008]

According to the above invention, if the length of the original in the original transport direction is longer than the distance that the original that has passed through the scale passes through the original reversing section and is transported on the scale again, the scale is turned over when the original is inverted. Retreat temporarily below the platen glass upper surface. Therefore, according to the present invention,
Even if the leading edge and the trailing edge of the document being reversed are sandwiched between the scale and the document transport unit, and they are transported in opposite directions, the load on the motor does not become extremely large. And the power consumption can be reduced, and the dirt and paper passing noise due to the rubbing of the original can be reduced, and a stable original transport state can be obtained. Particularly, in the case of a two-folded original, the leading end is hardly caught on the fold, and there is an effect of suppressing a jam.

[0009]

【Example】

<< Overall Configuration and Operation of Copying Machine >> FIG. 1 shows the overall configuration of a copying machine, and a photosensitive drum 10 having a photosensitive layer on an outer peripheral portion is provided at a substantially central portion of a copying machine main body 1 indicated by a reference numeral. It is installed so as to be rotatable at a constant peripheral speed v in the direction of arrow a. Around the photoreceptor drum 10, a main eraser 11, a charging charger 12, a sub-eraser 13, a developing device 14 using a magnetic brush system, a transfer charger 15, a paper separation charger 16, and a blade-type cleaner 17 are arranged along the rotation direction. Are located. An optical system 20 is disposed above the photosensitive drum 10.

The photoreceptor drum 10 rotates in the direction of arrow a, and has a main eraser 11, a charging charger 12, and a sub-eraser 13, respectively.
Image end static elimination is performed, and the image of the document set on the document table glass 29 is exposed by the optical system 20. The electrostatic latent image formed on the photosensitive drum 10 by the exposure is visualized as a toner image by the developing device 14.

The optical system 20 is disposed directly below the platen glass 29, and has one end exposed to a reference position SP.
An image of a document 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
Moves in the direction of the arrow b at a speed of v / m (m: copy magnification) with respect to the peripheral speed v of the photoconductor drum 10 (constant regardless of the same magnification and variable magnification). At the same time, the second mirror 23 and the third mirror 24 move in the direction of the 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.

Copy sheets, that is, copy sheets, are fed by an upper elevator type paper feeder 31 and a lower tray type paper feeder 3.
4 and are fed one by one from one of them based on the operator's selection. Each paper feed unit 31, 34
Are provided with paper feed rollers 32 and 35, and separation rollers 33 and 36 including a forward rotation roller and a reverse rotation roller. The paper fed from the upper paper feeding unit 31 is transported by the transport rollers 37b, 3
The sheet is sent out to a timing roller 38 installed immediately before the image transfer section through 7c. The paper fed from the lower paper feed unit 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 a manual paper feeding port 40 is fed by a paper feeding roller 41.
To the timing roller 38. The sheet sent out to the timing roller 38 once waits here, and is sent out to the transfer section by turning on the timing roller 38 in synchronization with the image formed on the photosensitive drum 10. The paper adheres to the photoconductor drum 10 at the transfer section, and the toner image is transferred by corona discharge from the transfer charger 15, and is separated from the photoconductor drum 10 by AC corona discharge from the separation charger 16 and the strength of the paper itself. Is done. After that, the paper
2, the toner is sent to the fixing device 43, where the toner is fixed, and is discharged onto the discharge tray 46 through the transport roller 44 and the discharge roller 45. On the other hand, the photosensitive drum 10 continues to rotate in the direction of arrow a even after the transfer, the residual toner is removed by the cleaner 17, and the residual charge is erased by the main eraser 11 to prepare for the next copy processing.

In the copying machine main body 1, a re-feeding unit 50 and paper passing path switching claws 47 and 48 are provided for processing double-sided / combined copying. The switching claw 47 is normally set at the solid line position, and guides the sheet to the discharge tray 46. At the time of double-sided copy or composite copy, the sheet on which the image of the odd-numbered document has been transferred to the first side (front side) is set at a position where the switching claw 47 is slightly rotated counterclockwise. Conveyance rollers 51a, 51b, 51
The sheet is discharged to the intermediate tray 52 through the members c and 51d, and is stored with the image surface facing upward. After a predetermined number of sheets are stored on the intermediate tray 52 and a refeed signal is generated,
The sheet is fed to the transport roller 37c one by one from the lowermost layer by the rotation of the re-feeding belt 53 and the separating roller 54.

In the two-sided copy mode, the re-fed sheet is sent out to the timing roller 38 while being guided upward by the switching claw 48 set at the solid line position, and is sent to the second side (back side). The image is transferred and fixed, and is discharged to the discharge tray 46. On the other hand, in the composite copy mode, the re-fed sheet is transported in the direction of arrow c by the transport roller 37d when the switching claw 48 is set at a position slightly rotated clockwise. Immediately before the trailing end of the sheet passes through the nip portion of the conveying roller 37d, the conveying roller 37d is switched to the reverse rotation, and the sheet is sent out to the timing roller 38 in a state where the sheet is turned upside down and upside down. Thereafter, the image is transferred onto the first surface (front surface), fixed, and discharged onto the discharge tray 46.

In the copying machine body 1, the copying process is started, and the first sheet is
When the printer is on standby immediately before step 8, the advance feeding process for feeding the second and subsequent sheets to the sheet feeding path in advance is performed. For example, in the sheet feeding from the lower sheet feeding unit 34, the second sheet is fed to the sheet feeding path following the first sheet, and the third sheet is also fed immediately before the transport roller 37a. Is fed up to Such advance sheet 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.
The schematic configuration and operation of the 60 will be described in detail. ADF60 is
A document feeder 601, a document feeder 602, and a document discharger 603 are provided. The document feeder 601 includes:
Document tray 61, leading edge regulating plate 63, pickup roller 65, document pressing plate 70, separating roller 75, separating pad 8
0, and a registration roller 90, and components other than the document tray 61 are covered with a cover 604 that can be freely opened and closed. The document conveying section 602 includes a driving roller 96 disposed near the document feeding section 601, a driven roller 97 disposed near the document discharging section 603, and a conveying belt 95. It is covered with a cover 605 that constitutes it. The document discharge unit 603 includes a reversing roller 100, a discharge roller 110, and a paper discharge tray 115. Components other than the paper discharge tray 115 are covered with a cover 606 that can be opened and closed.

The ADF 60 is set on the upper surface of the copying machine main body 1 so that the transport belt 95 is positioned on the platen glass 29, and is mounted on the platen glass 29 by a hinge (not shown) provided on the back side, that is, on the side opposite to the operation side. Can be opened to the upper surface of.

When an operator manually sets an original on the original table glass 29, the ADF 60 is lifted upward to open the upper surface of the original table 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 after the sensor SE100 detects that the ADF 60 is properly closed.

Documents to be fed are stacked on a document 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 leading end is regulated by the leading end regulating plate 63. Tip regulation plate 6
The 3 and the pressing plate 70 are rotatable about support shafts 64 and 71, respectively. The leading edge regulating plate 63 is retracted downward from the time of feeding the first document to the time when the feeding of the last document is completed. When the first document is fed, the pressing plate 70 moves downward from the retracted position shown in FIG.

Pickup roller 65, separating roller 75
Are driven to rotate clockwise in paper feeding. The originals pass through between the separating roller 75 and the separating pad 80 one by one from the lowermost layer and are sent to the registration rollers 90. The registration roller 90 temporarily stops the fed document at its nip portion, and after rotating for a predetermined time, conveys the document to the entrance of the document table glass 29.

The transport belt 95 is stretched endlessly between a driving roller 96 and a driven roller 97 so as to cover the entire surface of the original table glass 29. A number of backup rollers 98 are rotatably provided inside the transport belt 95 to press the belt 95 against the platen glass 29. The transport belt 95 is driven to rotate in the direction of arrow d, and a reference position (exposure reference) SP for starting exposure of the document at the boundary between the scale 120 and the platen glass 29 is started.
Set the document with the leading edge.

In the vicinity of the reversing roller 100, pinch rollers 101 and 102 and a switching claw 103 for switching a paper passing path for reversing the original in the both-side original mode.
Is provided. Normally, the switching claw 103 is set at the solid line position, and after the exposure is completed, the document is discharged from the platen glass 29 based on the rotation of the conveyance 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 discharged onto the discharge tray 115 by the discharge roller 110. In the case of a double-sided original, when the double-sided original is fed onto the platen glass 29 to copy the second side (back side) first,
The switching claw 103 is rotated in a clockwise direction by a predetermined angle from the state shown in FIG.
, And is returned onto the platen glass 29 with the second surface facing downward. At this time, the transport belt 95 is driven to rotate in the direction opposite to the arrow d. Further, after the exposure of the second surface is completed, the double-sided document is again conveyed around the reversing roller 100 for the copy process of the first surface (front surface).

The reversing roller 100 and the discharge roller 11
0 is rotationally driven by a discharge motor M4 (see FIG. 65). The ADF 60 has various sensors SE for detecting a document.
1, SE2, SE3 and SE10 are provided. Sensor S
E1 detects the presence or absence of a document on the tray 61. The sensor SE2 is installed immediately before the registration roller 90, detects arrival and passage of the original, and detects the arrival and passage of the original.
When the document is fed 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 portrait feed (the long side of the document is parallel to the transport direction)
The determination is made in consideration of whether the sheet is fed in the horizontal direction (the short side is parallel to the transport direction). The sensor SE3 is provided at the entrance of the reversing roller 100, and detects a document passing therethrough.

<< Description of Scale 120 and the Like >> Scale 12
0: Lift the ADF 60 and place the original on the platen glass 29
When placed on the upper side, a scale is provided so that one end of the original is placed according to the size of the original.
Has the function of forcibly stopping the document conveyed on the document table glass 29 by the conveyance belt 95 at the exposure reference position SP during the operation of.

The scale 120 is disposed opposite to the downstream end of the document table glass 29 in the document conveying direction, and is provided on the rear side and the front side on the upper frame 2 of the copying machine main body 1 as shown in FIGS. The holder 121 is rotatable about a pin 122 as a fulcrum.
It is mounted with its side biased upward.

The scale 120 has a projection 120a facing the upper frame 2 and a platen glass 29 at the bottom.
And a protrusion 120b protruding into a lower space of the document table, a notch preventing portion 120f protruding toward the end surface of the document table glass 29 below the front end surface 120c, a lever contact portion 120d at an upper rear side, and a further front end. A plurality of cutouts 120e of a predetermined length are provided at the upper corner of the side.

As a result, as shown in FIG.
0 is open with respect to the copier body 1, the scale 1
20 is a projection 12 based on the biasing force of the spring 123.
0b is engaged with the lower surface of the platen glass 29, and the position is regulated with the leading end projecting from the platen glass 29 by a predetermined height. In this state, the scale prevention unit 120
f is held below the upper surface of the platen glass 29. Therefore, the original having the original placed on the original platen glass 29 is accurately positioned with one end of the original abutting the scale tip surface 120c.

When the ADF 60 is closed with respect to the copying machine main body 1, the projections 99a of the frame 99 supporting the rollers 96 and 97 and the conveyor belt 95 are in contact with the scale 120. Conveyor belt 9
5 and is kept in a state of protruding from the upper surface of the document table glass 29 by a predetermined height. At this time, the scale 120 is
It is set so that it falls slightly from the state of. The frame 99 is kept parallel to the platen glass 29 by a positioning member (not shown). Therefore, the copying machine body 1
When the ADF 60 is attached to the printer, 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 two 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 without being restricted by the scale 120 based on the shortage of the pressing force or the pressing amount, so that the original can be reliably controlled by the scale 120. Further, the accuracy of stopping the original when the leading end of the original abuts against the scale 120 is improved, and the skew (oblique feeding) can be corrected reliably.

Lever 124 for rotating 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. When the solenoid SL1 is switched from the OFF state to the ON state, as shown in FIGS. It is pushed down below the glass 29.

By adopting the above configuration, the original conveyed from the right to the left on the original table glass 29 on the original platen glass 29 based on the movement of the conveyor belt 95 in the direction of arrow d,
The end on the downstream side in the moving direction is the tip surface 1 of the scale 120.
Stopped by hitting 20c. Thereafter, the copier body 1 starts an 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 clockwise in the drawing with the support shaft 125 as a fulcrum, and presses the lever contact portion 120d. As a result, the scale 120 is rotated clockwise in FIG.
9, the document is conveyed to the paper discharge side (left side) as the conveyance belt 95 moves.

When the rotation support shaft 122 of the scale 120 is disposed below the upper surface of the platen glass 29, the gap m between the scale front surface 120c and the platen glass 29 (see FIG. 6) is lowered. Becomes smaller as The scale tip surface 120c and the platen glass 29
The angle θ (see FIG. 5) with respect to the upper surface is set to be a right angle or more with respect to the document passing direction regardless of whether the scale 120 protrudes from the upper surface of the platen glass or is lowered. As a result, the scale 120 moves to the platen glass 2
9, even if the leading edge of the document is caught on the scale leading end surface 120c, the leading edge of the document is raised by its own waist strength and the guide function of the angle θ, and the scale leading end is easily moved. pass. Therefore, scale 12
The document does not get caught in the gap between the platen 0 and the platen 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 a 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 a pin 125 fixed to the internal frame 2a of the ADF 60. As shown in FIGS. 9 and 10, fan-shaped sections 124 a ′ and 124 b ′ each having a fixed pin 125 as a center are formed at the pin connecting portions of the lever members 124 a and 124 b. One of the lever members 124a (1
24b) can rotate relative to the other lever member 124b (124a) by a predetermined angle (β). A stroke absorbing spring 127 is wound around the fan-shaped sections 124a 'and 124b', and both ends thereof are engaged with the lever members 124a and 124b, respectively.
4b is urged in a clockwise direction relative to 4b, and is regulated to the state shown in FIG.
a, 124b are those whose upper surface intersection angle is angle φ (see FIG. 6)
It is made to do. Further, an elongated hole 124c provided in the lever member 124b is connected to a plunger SL1a of the solenoid SL1 provided above via a pin SL1b. The plunger SL1a is urged upward by a spring 126 provided on the internal frame 2a of the ADF 60. The urging force of the spring 126 is adjusted so that the lever member 124a contacts the scale 120 when the solenoid SL1 is in the off state, but does not push down the scale 120. That is, the spring 12
6,123,127 biasing forces N1, N2, N
Assuming that 3, the respective urging forces are adjusted so as to satisfy the relationship of N3>N2> N1. Therefore, even if there is an error in mounting the ADF 60 with respect to the copying machine main body 1, the lever 124 can be reliably brought into contact with the scale 120. There is no collision sound between 124 and the scale 120, and the sound of the scale 120 colliding with the elevation restriction member (the belt 95 and the protrusion 99 a) can be absorbed by switching the solenoid SL1 to the off state.

In the scale pressing mechanism having the above configuration,
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 is rotated about the support shaft 122 as a fulcrum, and the scale lowering positioning projection 120a is brought into contact with the upper frame 2 of the copying machine main body. At this time, the drive stroke of the solenoid SL1 is left.
That is, the plunger SL1a is not completely absorbed. The surplus stroke amount δ is determined by the copying machine body 1 and the ADF
It is determined in consideration of the combination accuracy with 60, etc., and is always larger than zero. Up to this point, since the urging force of the spring 127 is larger than the urging force N2 of the spring 123, the upper surface intersection angle of the levers 124a and 124b maintains φ.

When the plunger SL1a is further suctioned from this state, the suction force N at this time of the solenoid SL1 is applied.
12 is larger than the biasing force of the spring 127,
As shown in FIG. 5, the lever member 124a whose position is restricted by contacting the scale 120 is opposed to the other lever member 124a.
b rotates clockwise, absorbs the excess stroke amount δ of the plunger SL1a, and in the final suction state of the plunger SL1a, the upper surface intersection angle between the lever members 124a and 124b is φ−α (α <β), and the lever 124a and the lever 124a 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 incompletely sucked 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
, And is in contact with the belt 95, and the position is regulated in a state where the leading end surface protrudes from the upper surface of the document table glass 29. The lever 124 is disposed inside the ADF 60, is rotatably held around a support shaft 125, and has a substantially central portion connected to the plunger SL1a of the solenoid SL1 via a stroke absorbing spring 127. When the solenoid SL1 is off, the lever 124 and the plunger S
Due to the moment due to the weight of L1a, the tip of the lever 124 contacts the scale 120, but 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 about the support shaft 125, and the scale descending positioning projection 120a contacts the upper surface frame 2, and the scale Positioning is performed when the leading end is slightly lower than the platen glass 29. At this point, the plunger SL1a has not been completely sucked. However, the subsequent movement of the plunger SL1a 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 a spring 123, abuts on the belt 95, and the leading end surface protrudes from the upper surface of the platen glass 29. Position is regulated. The lever 124 is provided with a support shaft 125 at one end thereof, which is fixed to a rib 611 fixed to the inner frame 610 of the ADF 60.
Is engaged with a long hole 612 extending vertically. The lever 124 is connected to a spring 127 having one end fixed to the inner frame 610 and is urged upward. The approximate center of the lever 124 is the plunger S of the solenoid SL1.
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 pressed down. In this mechanism, when the solenoid SL1 is turned on, the lever 12 is moved in accordance with the lowering of the plunger SL1a.
4 rotates clockwise to push down the scale 120. The scale 120 is provided with the scale descending positioning protrusion 12.
0a is stopped in a state of contact with the upper frame 2. At this time, the stroke of the solenoid SL1 has surplus, and the subsequent movement of the plunger SL1a is
It is absorbed by the extension of 27 and the downward movement of the long hole 612 of the support shaft 125. In addition, regardless of the embodiment described above, the driving source may be a rotary solenoid or a motor, and the driving force transmitting means may be formed of a material or shape having flexibility in itself, or may use a frictional force or a magnetic force. It may be a torque limiter type absorption mechanism.

Notch 1 provided at tip of scale 120
The operation of 20e will be described. In the ADF 60, as described above, a plurality of documents conveyed between the separation roller 75 and the separation pad 80 based on the sheet feeding action of the pickup roller 65 are separated from the separation roller 75 and the separation pad 8.
The sheets are separated one by one by a separating action of zero. 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 the separation pad 8
Since 0 is formed of a material having a relatively high coefficient of friction,
Paper dust or shavings of the original image (especially images having poor printability or image fixability, such as copy originals and pencil-written originals) are generated in the original contacting with the separating pad 80, and may adhere to the original. Or after once attaching to the separating pad 80,
Attaches to subsequent documents. Similarly, paper dust adheres when a separated document passes through the separation pad 80 based on the driving of the registration roller 90. The paper dust and the like attached to the original adhere to the original when the original comes into contact with 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 leading end of the scale 120. The paper dust is scraped off and stains the platen glass 29, or drops into the inside of the copier body 1 from the gap between the platen glass 29 and the frame 2 of the main body, thereby contaminating the optical system and chargers and deteriorating the image quality. Invite you. Therefore, in the copying machine according to the present embodiment, as shown in FIG. 15, the notch 1 is formed at the leading end of the scale 120 and the resin film 133 at the portion located on the extension of the separating roller 75 in the document conveying direction.
20e and 133a are formed. Therefore, the paper dust adhering to the contact portion with the separating pad 80 on the document is not scraped off by the resin film 133 or the scale 120, and the above-mentioned problem is solved. The AD of the present embodiment
In F, a movable scale is used, but the same applies to a fixed scale. Although the separating system uses a separating pad, the same applies to various types such as a reverse roller type. If paper dust or the like is generated at the registration roller or the reversing roller, a notch may be provided at a portion corresponding to the position. On the other hand, the configuration of the ADF may be such that the conveyance unit of the platen glass is not a belt, for example, a roller,
The same effect can be obtained in a configuration in which copying is performed while passing over a 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 separating roller 75 from the tip of the tray 61, and the tip extends to the registration roller 90. Another document guide plate 132 is installed from above the separating roller 75 to the downstream side of the registration roller 90. The distal end regulating plate 63 is fixed to the support shaft 64 while the guide plate 13
1 and is movable between a regulation position (a position shown in the drawing) in which the tip protrudes from the guide plate 131 and a retracted position retracted below the guide plate 131. Normally, the leading end regulating plate 63 is set at the regulating position, has a function of receiving the leading end of the document set on the tray 61, giving the operator a sense of setting, and aligning the leading end of the document.
When the document feed start signal is issued, the leading end restricting plate 63 retreats below the guide plate 131 and is held at this retreat position until the last document is fed.

The original pressing plate 70 has a pickup roller 65.
And a plurality of guide sleeves 70b provided on the document pressing plate 70, as shown in FIG.
The original pressing plate 70 is inserted into a guide pin 74 fixed to a guide plate 134 so as to be movable up and down and can be moved toward and away from the pickup roller 65. Each is connected to the guide plate 134 and constantly urged upward. Lever 7
2 is fixed to a support shaft 71 as shown in FIG. The support shaft 71 is reciprocally rotatable by the rotation driving means shown in FIG. 18. The lever 72 is always positioned at the solid line position, but is urged to rotate counterclockwise during the sheet feeding operation. Then, the document pressing plate 70 is urged toward the pickup roller 65, and the fed document is pressed against the pickup roller 65 with a predetermined pressure. The document pressing plate 70 is used to
Regardless of the thickness, the document is moved in parallel with the pickup roller 65 and perpendicular to the same in order to maintain a certain document entry angle with respect to the front separation plate 85 and the separation roller 75 to achieve a reliable separation operation. The original pressing plate 70
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 formed of a spherical surface. As a result, the two paper feed rollers 65 can be contacted in parallel and evenly applied with pressure, thereby preventing skew of the original.

By the way, 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 “fed” by the pickup roller 65,
The sheet passes between the separation roller 75 and the separation pad 80.

Further, as shown in FIG. 16, a front separating plate 85 and an elastic sheet 86 adhered to the front separating plate 85 are provided immediately before the separating pad 80 to improve the separating performance. The front separating plate 85 is provided with a downward slope in the sheet feeding direction from above the front end regulating plate 63, and the lower end 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 closer to the surface of the separating roller 75 with a slight gap. The plurality of originals conveyed by the pickup roller 65 have their leading ends abutting on the front separation plate 85, and the lower the original, the more advanced the original.
Only one or two originals pass through the lower end of the front separating plate 85. The elastic sheet 86 assists the front separation plate 85 in the front separation operation. In FIG. 16, reference numeral 132a denotes a document SE conveyed between the guide plates 131 and 132 by a sensor SE.
2, a detection hole for detection in SE10.

<< Driving Mechanism of Tip Control Plate 63 and Pressing Plate 70 >> A driving mechanism of the tip control plate 63 and the pressing plate 70 will be described. In FIG. 18, the support shaft 64 to which the distal end regulating plate 63 is fixed has a lever 140 integrally fixed to an end thereof, and is constantly urged counterclockwise by a torsion spring 141. With this urging force, the tip regulating plate 63
Is set at a regulation position protruding from the guide plate 131. The support shaft 71 to which the holder 72 of the pressing plate 70 is fixed.
The lever 142 is integrally fixed to the end, and is constantly urged counterclockwise by the torsion spring 143. The pressing plate 70 elastically presses the original on the pickup roller 65 by this urging force.

Fan-shaped cam plates 145, 146 are provided between the levers 140, 142.
The 46 support shafts 147 are connected to a pickup motor M1 that can rotate forward and backward. 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, 142 rotate based on the forward / reverse rotation of the cam plates 145, 146, and the leading end regulating plate 6
3 and the position of the pressing plate 70 are set. Disks 148 and 149 are fixed to the camshaft 147.
8,149 notched edges 148a, 148b, 14
9a and 149b are transmission type photo sensors SE11 and SE
12 (light emitting element x, light receiving element y). The rotation of the cam plates 145 and 146 is controlled by the on / off operations of the photo sensors 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 leading end regulating plate 63 is set at the regulating position, and the pressing plate 70 is It is set to the evacuation position. After the power is turned on, the pickup motor M1 is driven to rotate in the reverse direction, and together with the cam shaft 147, the cam plate 14 is rotated.
5, 146 and disks 148, 149 are rotated clockwise. Immediately after the reverse rotation, the sensor SE11 detects the edge 148a of the disk 148 and turns off, whereby the cam 145,
The home position of 146 is confirmed, and the pickup motor M1 is temporarily turned off. Thereafter, when a document exchange signal is issued, the pickup motor M1 is driven to rotate in the reverse direction, and the cam plates 145 and 146 rotate in the clockwise direction, and the sensor S
E12 detects the edge 149b of the disk 149 and turns off, thereby turning 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 rotates the lever 72, thereby pressing the pressing plate 70.
Moves vertically downward, pressing the leading end of the document against the pick-up roller 65 to apply a paper feed pressure. Further, the lever 140 comes into contact with the major portion of the cam plate 145, and the tip regulating 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 driven to rotate, and the first document is fed. When the leading edge of the fed document reaches the registration roller 90, the pickup motor M1 is driven to rotate in the reverse direction, and the cam plates 145 and 146 rotate in the clockwise direction, and the sensor SE is rotated.
12 is turned on by the edge 149a of the disk 149, whereby the pickup motor M1 is turned off. At this time,
As shown in FIG. 20, the levers 140 and 142 hold the leading end regulating plate 63 in a standby state, and the pressing plate 70 is retracted upward to release the pressing on the document.

For the second and subsequent originals, the pickup motor M1 is driven to rotate forward, the cam plates 145, 146 rotate counterclockwise, and the sensor SE11 detects the edge 148b of the disk 148 and turns off. This turns off the pickup motor M1, but stops at the position shown in FIG. 21 with some overrun. Thereafter, as described above, the pickup roller 65 and the separation roller 75 are driven to rotate,
Documents after the first sheet are fed. When the leading edge of the fed document reaches the registration roller 90, the pickup motor M1 is driven to rotate in the reverse direction, and returns to the pressing release position shown in FIG.

By operating the pickup motor M1 as described above, the rotation angle can be minimized both when pressing from the home position (FIGS. 19 to 21) and when pressing from the release position (FIGS. 21 and 22). Can be Also, the pickup motor M1 is controlled so that the position of the cam plates 145 and 146 does not shift due to the overrun of the pickup motor M1 due to the difference in the rotation direction.
Disk 149 by the sensor SE12 when is rotated in the reverse direction.
Is detected slightly earlier 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 in the forward rotation driving is performed by the sensor SE12. The sensor position and the disk are designed so as to be slightly earlier than the detection of the edge 149b of the disk 149 by.

That is, in the present embodiment, the driving mechanism of the distal end regulating plate 63 and the pressing plate 70 is simplified by a single system, and since the driving mechanism is driven by the cam plates 145 and 146, no noise is generated at the time of driving. . Further, since the leading end regulating plate 63 is held at the retracted position from the start to the end of the sheet feeding operation, the leading end of the document is not damaged and the document is not skewed. Further, the pressing plate 70 presses the original only when the leading end of the original passes through the separating roller 75, and thereafter retreats upward, so that there is no possibility that a paper feeding error such as the feeding of the original occurs.

<< Registration Roller >> The registration roller 90 will be described. Referring to FIG.
The nip portion temporarily receives the leading edge of the document fed by the rotation of the pickup roller 65 and the separating roller 75 at the nip portion, and aligns the leading edge of the document at the nip portion to correct the skew of the document. A predetermined time after the leading edge of the fed document is detected by the sensor SE2, the feeding motor M2
Is turned off, the pickup roller 65, the separating roller 75
Is stopped. At this time, the leading end of the document comes into contact with the nip of the registration roller 90 to form a slight loop.

Thereafter, the registration roller 90 is driven to rotate by turning on the main motor M 3 in synchronism with the copying operation in the copying machine body 1, and sends out the original to the entrance of the original platen glass 29. As described above, in this embodiment, the pickup roller 65 and the separation roller 75 are separately driven by the sheet feeding motor M2, and the registration roller 90 is separately driven by the main motor M3 together with the transport belt 95. Also,
One-way clutches 67 and 77 are provided between the pickup roller 65 and its drive shaft 66 and between the separating roller 75 and its drive shaft 76, respectively. During the movement, the pickup roller 65 and the separation roller 75 are allowed to rotate idle clockwise.

The driving mechanism of the registration roller 90 and the conveyor belt 95 will be described. As shown in FIG. 22, a timing belt 155 extends between an output pulley 150 provided on an 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 extends 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 158 is rotatably supported by a support shaft 160 fixed to a frame (not shown).
9, and the gear 159 is engaged with a gear 161 fixed to the support shaft 162 of the drive roller 96. Thus, when the main motor M3 rotates in the direction of the arrow, the registration roller 90 and the driving roller 96 rotate in the same direction,
The transport belt 95 moves in the direction of arrow d. The main motor M3 is rotatable in the forward and reverse directions, and can temporarily convey the document in the direction opposite to the arrow d direction in the 2-in-1 mode or the duplex mode.

<< Registration roller 90, paper feed roller 65,
Arrangement of Registration Roller 75 and Registration Roller 75> The arrangement relationship between 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 the present embodiment, a paper passing reference PS is provided on the back side of the copying machine, that is, on the side opposite to the operation 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 due to a moment when a document held between the separation roller 75 and the separation pad 80 is pulled out by the registration roller 90. Further, the conveyance force of the registration roller 90 is set to be considerably larger than the conveyance force of the separation roller 75, thereby preventing the document from slipping during conveyance by the registration roller 90. Further, in the direction orthogonal to the document conveying direction, the center registration roller 90 and the separation roller 75 are separated by a distance D1, and the registration rollers 90, 90 on both sides are separated from the separation roller 7 by a distance D1.
Reference numeral 5 is arranged at a distance D2. Therefore, dirt such as paper dust generated in the pickup unit and the separation unit is not transferred to the registration roller 90.
The conveying force of 0 is kept constant, and no stain adheres to the registration roller 90, so that no stain is transferred from the registration roller 90 to the document.

<< Mechanism for Opening / Closing the Document Feeding Path of Document Feeding Unit >> In FIG. 24, one of the registration driving rollers 90a constituting the registration roller 90 is fixed to a support shaft 91a. The support shaft 91a is inserted into bearing holes 173a, 173a provided in the main frame 173 of the ADF 60.
It is rotatably supported via 4a and 174a and is drivingly connected to the main motor M3. The support shaft 91a is provided with cams 171a and 172a. The other registration driven roller 90b constituting the registration roller 90 is fixed to a support shaft 91b. The support shaft 91b is
a, and bearings 174b, 174b are provided in elongated bearing holes 173b, 173b provided in the main frame 173.
4b, it is rotatably supported by the support shaft 91a so as to advance and retreat. Eccentric cams 171b and 172 are provided on the support shaft 91b.
b is rotatably provided, and a frame 174 holding an opening / closing cover 604 of the document feeding unit 601 is provided with an eccentric cam 171.
b, and a guide plate 135 for guiding 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 urged toward the support shaft 91a by urging means such as springs 174c and 174c.

Document feeder 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 drive roller 90a and registration driven roller 90b
Is in pressure contact. At this time, the cams 171a and 172a are separated from the eccentric cams 171b and 172b, respectively.
The center distance between the two is set to M1. In this state, when the cover 604 is rotated in the direction indicated by the arrow f in order to take out the document jammed in the paper passage path from the separating section to the registration section, the eccentric cam 171b rotates and the outer peripheral portion contacts the cam 171a. Further, when the cover 604 is further rotated against the urging force of the spring 174c from this contact state, as shown in FIG.
Is increased to M2 (> M1), and the registration driven roller 90b is separated from the registration driving roller 90a.
On the other hand, as shown in FIG. 27, when the guide plate 135 is rotated in the direction of arrow g in order to take out the document that has jammed downstream of the registration unit, the eccentric cam 172b rotates and the outer peripheral portion contacts the cam 172a. The center distance between the support shafts 91a and 91b expands to M3 (> M1) and the resist driven roller 9
0b is separated from the registration drive roller 90a. In addition,
The rollers 90a, 90b are often made of an elastic member such as rubber or sponge at the outer periphery. In the case of using such rollers, the rollers 90a, 90b do not need to be completely separated from each other. It is sufficient if the pressing force between them can be reduced to such an extent that the document held between them can be pulled out without damage. As described above, in the document feeder 601, the springs 174c and 174c urge the registration driven roller 90b toward the registration drive roller 90a, and the cover 904 and the guide plate 135 are provided on the support shaft 91a based on the opening operation. Cam 171a,
172a and eccentric cams 171b, 171b fixed to the support shaft 91b.
72b are respectively engaged with each other to release the pressure contact of the registration roller 90. Therefore, the roller 90a
And 90b can be uniformly and accurately set in the axial direction, and can be properly maintained regardless of the mounting accuracy of the cover 904 and the like and the locking force. In this embodiment, the configuration is such that the registration driven roller is retracted, but the configuration may be such that the registration driving roller is retracted. Further, the relationship between the driving and the driven can be reversed.

<< Cover Support Mechanism >> As shown in FIG. 28, the cover 604 is rotatably supported by a frame 174 via a shaft 175. A guide plate 132 is fixed to the frame 174.
The cover 604 is urged in a counterclockwise direction by an elastic member such as a spring 176 or a sponge provided on the cover. Thus, when the cover 604 is closed, the cover 604 is urged by the spring 174 and
05 and is positioned. Therefore, the cover 6
Even if a document or the like is placed on the sheet 04 and an external force acts thereon, the separating pressure of the separating roller 75 and the separating pad 80 is not affected. Even when a force acts on the cover 604 from the side, the movement of the cover 604 is absorbed by the spring 176 and does not affect the separating pressure. Therefore, a stable separating pressure can always be secured. Further, no excessive load is applied to the drive motor of the separating roller 75.

<< Document Feeding Mode of ADF >> The document feeding mode of the ADF 60 will be described. In this embodiment,
There are four types of document transport modes: a pre-step mode, a 2-in-1 mode, and a count mode, in addition to the conventional duplex mode. In addition, the document transported by the ADF 60 is stopped accurately at the exposure reference position SP. For this purpose, there are a scale mode suitable for ordinary paper and a pulse control mode suitable for thin paper. The selection of the scale mode and the pulse control mode is performed by a document selection key 105 provided on the operation panel (see FIG. 126). . When the original is conveyed, the original is set at the exposure position when the leading end is set to the exposure reference position SP, the pre-step position when set at the intermediate position IP, and set at the nip portion of the registration roller 90. Is called the advance position. When the size of the document is not specifically described, the small size is assumed to be A4 horizontal feed, and the large size is assumed to be A3 vertical feed.

The scale mode is a mode in which the leading edge of the original conveyed by the conveyor belt 95 is brought into contact with the scale 120 to forcibly stop the original. In this case, as shown in FIG. 4, the solenoid SL1 is turned off. As a result, the tip of the scale 120 protrudes above the platen glass 29. The document D conveyed in the direction of arrow d by the conveyance belt 95 has the leading end abutting on the scale 120 and the conveyance force of the conveyance belt 95 is set to be weaker than the buckling resistance of the document. Slip occurs, and the vehicle is accurately stopped at the reference position SP.

In the pulse control mode, as will be described below, the registration roller 90 and the conveyance belt 95 are driven by a single main motor (stepping motor) M3 so that the conveyance speeds of the two are the same, and the original is conveyed. Transfer length L
(See FIG. 30). The document conveyance amount with respect to the number of drive pulses 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 by which the document waiting immediately before the registration roller 90 is transported to the reference position SP. During execution of the pulse control mode, the solenoid SL1 is maintained in the ON state, and the scale 120 holds the position retracted downward from the upper surface of the document table glass 29.

When the scale mode and the pulse control mode are compared, the scale mode indicates that the original
In this case, the stop position accuracy is high. However, when the document is thin, there is a problem that the buckling resistance of the document is small and the leading end is easily broken or a paper jam occurs. The pulse control mode has an advantage that no trouble occurs at the time of stoppage even for a thin document, but there is a problem that stop position accuracy is not always as high as that of the scale mode due to slippage of the document and a shift in response of the drive mechanism.

In the pre-step mode, as shown in FIG. 29, when the document size is less than half the size from the exposure reference position SP to the document advance position (the position where the leading edge of the document abuts the registration roller 90), The first original D1 is stopped with its leading end coincident with the exposure reference position SP, and the next original D2 is transported to a position where its leading end coincides with the intermediate position IP. This is a mode in which the first sheet is fed in advance until the leading end thereof comes into contact with the registration roller 90. In the pre-step mode, when combined with the pulse control mode, when replacing the original, the main motor M3 drives the pulse so that the original is conveyed by a distance corresponding to 1/2 of the distance L from the registration roller 90 to the reference position SP. The normal rotation is driven by P02. That is, the first document D1 set at the exposure reference position SP
Every time the exposure of the motor is completed, the main motor M3 outputs the pulse P
02, the second document D2 is transported to the exposure reference position SP, and the third document waiting by the registration roller 90 is transported to the intermediate position IP.

On the other hand, when the pre-step mode is combined with the scale mode, when replacing the original, FIG.
As shown in the figure, the main motor M3 is (L / 2) + (α /
Pulse P so that the document is conveyed by a distance equivalent to 2)
02 ′ is driven forward. α is an overrun amount for ensuring that the leading edge of the document abuts on the scale 120. Accordingly, the second document D2 is moved to the intermediate position I which has been conveyed from the registration rollers 90 by (L / 2) + (α / 2).
Wait at P '. This second document D2 is at the intermediate position I
From P ′, (L / 2) + (α /
2) The transport amount to be moved is given as (L / 2) − (α /
At the point of time when the sheet is conveyed by 2), the leading end abuts on the scale 120 and stops at the exposure reference position SP, and the conveyance belt 95 slips with respect to the document by the distance α.

In this scale mode, the solenoid SL1 is normally turned off, and the scale 12 is turned off.
Reference numeral 0 protrudes upward from the upper surface of the document table glass 29.
The solenoid SL1 is turned on immediately before the document passes the exposure reference position SP, and retracts the scale 120 below the platen glass 29.

<< Pre-Step Mode >> FIGS. 31 to 39 show the document transport state in the pre-step mode. FIG. 31 shows a state in which a document is set on the tray 61.
It is assumed that two small-size originals D1, D2, and D3 are set. First, the tip regulation plate 63 is retracted downward, and the pressing plate 70
Moves downward, and the pickup roller 65 and the separation roller 7
5 is driven to rotate, the first document D1 is fed, and the apparatus stands by with the leading end abutting on 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 transported to the intermediate position IP (see FIG. 33). Next, the pickup roller 65 and the separating roller 75 are driven to rotate, and the second document D2 waits at the registration roller 90 (see FIG. 34). Further, the main motor M3 is driven to rotate forward by the pulse P02, and the original 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, feeding of copy paper and exposure by the optical system 20 are performed a number of times corresponding to the number of copies. 3rd original D during exposure
3 is fed in advance to the registration roller 90 (FIG. 36).
reference).

When the exposure of the document D1 is completed, the main motor M3 is driven to rotate forward by the pulse P02, and the discharge motor M4 is driven to rotate the reversing roller 100 and the discharge roller 110. As a result, the document D1 is
5, and the document D2 is moved to the exposure reference position SP.
The document D3 is transported to the intermediate position IP (see FIG. 37). Here, the exposure of the document D2 is performed. When the exposure is completed, the main motor M3 is driven to rotate forward by the pulse P02, and the discharge motor M4 is also driven. Therefore, the document D2 is placed on the tray 1
The document D3 is sent 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, and the document D3 is discharged onto the tray 115 (see FIG. 39).

In this embodiment, the original fed first is fed by the registration roller 90 to the platen glass 2.
9 and the trailing edge of the original is
When detected by E2, the empty sensor SE1 is checked, and if the original remains on the tray 61, the first sheet feeding is performed, and if there is no original, the leading end regulating plate 63 is returned to the upper regulating position.

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

For this reason, in the ADF 60 of this embodiment, since the resin film 133 is provided in the belt conveyance section, 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, L / 2-
If d1 ≒ dp, this pre-step position IP
The rear end of the document to be stopped interferes with the resin film 133. Further, when a minute skew occurs during the conveyance of the resist, only a part of the rear end of the document interferes with the resin film 133, and the skew state is further deteriorated. For this reason, in the ADF 60 of this embodiment, the relationship of L / 2−d1 <dp is set, and the disturbance of the document stop state due to the interference with the resin film 133 is eliminated. The transport belt 9
Assuming that the return amount of No. 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 /
The respective lengths may be set so as to satisfy the relationship of 2-d1-β> dp. In the present embodiment, the nip position of the registration roller 90 is set as the leading position, but it may be positioned by a sensor or the like or regulated by a stopper gate.

As described above, in the pre-step mode, since the original is stepped in units of (L / 2), the original exchange time is short, and the optical system 20 after the exposure is completed.
Can be replaced within the time when the user returns to the home position, and copy productivity is improved. In addition, the subsequent document (third document) is fed in advance until the leading end thereof contacts the registration roller 90. This advance feeding is performed during the exposure of the original, which contributes to the improvement of copy productivity.

As shown in FIG. 22, the registration roller 90 and the conveyor belt 95 are connected to a single main motor M3.
And the main motor M3 is driven as a stepping motor by pulse driving. By controlling the number of pulses supplied to the motor M3, the original sent from the registration roller 90 can be accurately referenced. It can be transported / stopped to the position SP. Even if the motor M3 is not a stepping motor, a similar effect can be obtained by attaching an encoder to the rotating shaft and converting the number of rotations into the number of pulses to control 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 documents are arranged as a set on the platen glass 29 and an image is formed on one copy sheet. FIGS. 40 to 51 show a document conveyance state in the 2-in-1 mode. FIG.
. Here, it is assumed that four small-size originals D1, D2, D3, and D4 have been set. First, the first document D1 is fed, and the apparatus stands by with the leading end abutting on the registration roller 90 (see FIG. 41). Next, the main motor M3 is rotated forward to feed the document D1 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 rear end of the document reaches the nip portion of the registration roller 90. Note that, at the time of switchback, the resin film 13 is used to prevent the rear end of the original from returning 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 started. Is the registration roller 9
0 and stops (see FIG. 43).

Next, the main motor M3 is driven to rotate forward to transport the originals D1 and D2 on the platen glass 29, and
The main motor M3 is turned off at the time when the tip of No. 1 reaches the exposure reference position SP. Thus, the originals D1 and D2 are juxtaposed on the platen glass 29 (see FIG. 44). The rotation of the main motor M3 is reduced just 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 the deceleration. Then, by the time the exposure of the originals D1 and D2 is completed, the leading end of the original D3 comes into contact with the registration rollers 90, and the advance feeding is completed (see FIG. 45).

When the exposure of the originals D1 and D2 is completed, the main motor M3 is driven to rotate forward and the discharge motor M4 is driven. The document D1 has a reversing roller 100 and a discharging roller 1
The document D2 is sent to the tray 115 by the
After the first document, the third document D3 is the platen glass 29.
It is sent up (see FIG. 46). When the rear end of the document D3 reaches the platen glass 29, the main motor M3 is switched to reverse rotation, and the document D3 is switched back in the same manner as the document D1. At this time, the document D1 is given a conveying force by the reversing roller 100 and is discharged onto the tray 115 as it is. Since the leading end of the document D2 has not yet reached the reversing roller 100 at the start of switchback, the document D2 is switched back together with the document D3 (FIG. 47).
reference). Immediately after the switchback is completed, the fourth document D4 is advanced fed to the registration rollers 90.

The discharge motor M4 is driven as it is, and then the main motor M3 is driven forward. The main motor M3 is driven to rotate forward until the leading end 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. Thus, the originals D1, D2
During the discharge, the subsequent document D3 is switched back once, thereby increasing the interval. When the two originals are pushed out onto the tray 115 without a gap, the following original protrudes the preceding original, and the alignment on the tray 115 is disturbed. Disturbed. However, by increasing the interval between the two documents D1 and D2 at the time of discharging as in the present embodiment, the tray 115
It is possible to eliminate the disturbance of the original.

When the exposure of the originals D3 and D4 is completed, the main motor M3 is driven to rotate forward and the discharge motor M4 is driven. Then, the main motor M3 is turned off once when the rear end of the document D3 is separated from the transport belt 95 (FIG. 4).
9). The time when the main motor M3 is off is
The interval between the originals D3 and D4 corresponds to a time that can be opened to such an extent that no disturbance occurs in the tray 115 (see FIG. 50).
Here, the main motor M3 is driven to rotate forward, and the document D4 is discharged onto the tray 115 (see FIG. 51).

The discharge of the exposed document and the setting of the subsequent document to the exposure position SP are performed as described above. The reversing roller 100 and the discharge roller 110 are connected to the main motor M
3, driven by an independent discharge motor M4,
Since the conveyance force by the reversing roller 100 and the pinch roller 101 is set to be larger than the conveyance force by the conveyance belt 95, the document introduced into the discharge unit is moved by the conveyance belt 9.
5 can be discharged onto the discharge tray 115 regardless of the operation 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
Assuming that the distance from 01 to the exposure reference SP is d3, d3
> D1 + d2 (= d4) (see FIG. 30), the second sheet of the preceding document is turned to the reversing roller 100 and the pinch roller when the trailing edge of the following document reaches the switchback point BP. 101, and the preceding two originals are continuously discharged without a gap. In the discharging process, if the leading edge and the trailing edge of the two documents overlap each other, the document is placed on the discharge tray 115 below the document discharged first.
The first document slips in or the preceding document is pushed out, disturbing the alignment of the document. A similar problem occurs when the preceding document (especially, the first document) is short and the subsequent (third) document is long, but the difference in document length Δdp (copier Δdp = d, where dpmax is the length of the original in the original transport direction, and dpmin is the length of the original of the minimum length, in which the 2-in-1 mode can be executed.
pmax−dpmin), d3> d4 + Δd
p: Set to a positional relationship that satisfies (d4 = d1 + d2). As a result, the two documents that are simultaneously exposed are discharged from the platen glass 29 with a sufficient space between them, so that the arrangement order of these two documents is not disturbed.

<< Duplex Mode >> The basic operation of the duplex mode will be described. As shown in FIG. 52, when the originals D1 and D2 are set on the original tray 61 and the copy start button of the copier body 1 is turned on, the ADF 60 starts the original feeding operation. During document feeding, the pressing plate 70 presses the leading end of the document D1. The document D1 is transported to the position of the registration roller 90 based on the rotation of the pickup roller 65 and the paper feed roller 75, and the leading edge of the document D1
The pickup roller 65 and the paper feed roller 75 stop rotating at the time when the loop is formed by contact with the roller (see FIG. 53). Further, the pressing state of the original D1 by the pressing plate 70 is released, and the first original feeding operation is completed.

Next, the registration roller 90 and the conveyor belt 9
5, and the reversing roller 100 rotates, 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 below the platen glass 29, and the switching claw 103 is operated to switch the paper passage path of the document discharge section to the reverse path. When the exposure is completed, the document D1 is sent to the reversing path of the discharge unit, and the registration roller 90, the transport belt 95, and the reversing roller 10 are held in a state where the leading end is 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 transport belt 95 rotates in the reverse direction, and the transport of the document D1 is restarted. As a result, the document D1 passes through the reversing path and is sent again to the document table glass 29, is set at the exposure position SP, and the back surface of the document is copied (see FIG. 55). When the copying of the back side of the document is completed, the document D1 is transported again to the reversing path, and the front side of the document is copied this time (see FIGS. 56 and 57). When the exposure operation on the front side of the document is completed, the registration roller 90, the conveyance belt 95, and the reversing roller 100 rotate, the switching claw 103 operates in the reverse direction, and the first document is discharged onto the discharge tray 115. (See FIG. 58). When the first document is discharged, the switching claw 103 operates again, and
The document transport path is switched to the reverse path in order to reverse the sheet document (see FIG. 59). The second document is transported to the position of the registration roller 90 during the exposure of the surface of the first document (see FIG. 57), and the first document is placed on the platen glass 29.
Immediately after the sheet is discharged from the platen, the sheet is supplied to the exposure position SP on the platen glass 29 and is processed in the same manner as the first document (see FIGS. 60 to 63).

<< Count Mode >> The count mode will be described. The count mode refers to a mode in which, before starting the copy processing using the ADF 60, the document is once cycled by the ADF 60 without a copying operation, and the number of documents is counted. ADF that starts feeding from the last page if the number of originals is odd in 2-in-1 mode
In the case of 60, there occurs a problem that the image of the first page is formed on half of one copy sheet, that is, a problem that half of the cover of the copy becomes blank. Therefore, the ADF 60 counts the number of documents in advance, and if the number is an odd number, only one sheet of the last page document fed first is conveyed onto the platen glass 29, and the subsequent documents are conveyed in the aforementioned 2-in-1 mode. I decided to. Further, similar problems occur in both-sided copying and combined copying, so it is necessary to previously count the number of documents in the count mode.

Since the copy operation is not involved in the count mode, it is preferable to perform the processing as fast as possible (as short as possible). However, the ADF 60 employs a method in which the leading edge of the document is stopped at the reference position SP on the downstream side in the transport direction of the platen glass 29. Therefore, even if the document is stopped at this reference position SP even in the count mode, the distance between the document and the document is reduced. Becomes large, and the time of the idle feeding increases.

Therefore, in the count mode, the rear end of the original is positioned at the stop reference position X on the platen glass 29 (see FIG. 2).
9), the document is temporarily stopped based on the point in time. As a result, the interval between the originals during the 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 rear end of the document at the reference position X can be detected by detecting the rear end 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 can be set arbitrarily in addition to the position shown in FIG. 29. If the reference position X is on the upstream side of the stop reference position SP during the copy operation, the processing time in the count mode can be reduced. Contribute to shortening. The reference position X does not need to be set on the platen glass 29, and may be any position as long as it is downstream of the nip portion of the registration roller 90. Reference position X
Is closer to the nip portion of the registration roller 90, the processing time is shortened.

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 copy processing. 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 100% decrease in copy productivity described above, the document transport speed must be higher than the reference speed. Is preferred. The operation of delaying the copy operation is such that when the two-sided document is reversed by the reversing roller 100, when the first fed document is transported to the exposure reference position SP, the last fed document is moved from the platen glass 29. It is time to discharge to the tray 115.

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

Hereinafter, control of the copying machine will be specifically described with reference to flowcharts. In the following control, on-edge means that switches, sensors, signals, and the like are switched from an off state to an on state, and off-edge means that switches, sensors, signals, and the like are switched from an on state to an off state. means. Also, the sensor SE
1, SE2, SE3, SE10, SE11, and SE12 are turned on when the optical axis is shielded, and turned off when the optical axis is opened. In the case of a flag, “1” is on and “0” is off.

<< Main Routine >> FIG.
Is a main routine of the CPU 1 for controlling the CPU 1. 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 initial settings for setting various devices to the initial mode are performed. Subsequently, the internal timer is started in S2. The internal timer determines the time required for one of the main routines, and its value is set in S1. Further, this internal timer is a reference for counting of various timers appearing in each subroutine.

Next, the subroutines of S3 to S10 are sequentially called to perform necessary processing, and the process returns to S2 after waiting for the end of the internal timer in S11. 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 scan the photosensitive drum 1
S8 is a subroutine for automatically forming a sheet of an appropriate size based on the document size and the copy magnification, and S8 is a subroutine for forming an electrostatic latent image on S0.
Reference numeral 9 denotes a stop position adjustment processing subroutine for adjusting a document stop position on the platen glass 29, and S10 denotes other processing, that is, driving of the photosensitive drum 10 and its surrounding elements, conveyance of copy paper, fixing, and paper jam detection. When entering the stop position adjustment mode, the platen glass 2
9 is a subroutine for performing a process for adjusting a document stop position on the document 9. Note that the CPU 1 is connected to the CPU 2 via a serial communication line, and transmission and reception are performed in S12 by interrupt processing.

<< APS Processing Routine >> In the APS control routine, as shown in FIG. 67, it is determined whether or not the APS mode is selected in S8-1. The APS mode is set and set / canceled by an APS mode selection key (not shown) provided on the operation panel of the copying machine body 1. If the APS mode has been selected, S8-
In step 2, the APS process, that is, a sheet having an optimum size based on the document size and the copy magnification is supplied from the sheet feeding unit. Here, if a sheet of a suitable size is stored in the sheet feeding unit, the process returns (S8-3). Determine whether or not. The switch SW2 is a switch for instructing whether or not to convert an inch size to a metric size (A size or B size).
When the switch SW2 is turned on in the copying machine using the metric system size as the reference size, the APS is executed in S8-5.
The size of the inch system read in the mode is converted as shown in Table 1 below, and in S8-6, the sheet is fed from the sheet feeding unit in which the converted size sheet is stored. 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 in S9-1 whether or not the original stop position adjustment switch SW1 is turned on. It is preferable that the document stop position adjustment switch SW1 is provided, for example, behind the copying machine main body 1, and is arranged in a place where the user cannot see it in a normal state. If the document stop position adjusting switch SW1 is turned off, the process returns. If the switch SW1 is turned on, the document mode is determined in S9-2. 3. The process branches to steps S9-4 and S9-5, and the adjustment amounts ADJ1 and AD of the document stop position input from the ten key
J2 and ADJ3 are stored in the RAM of the copier body 1 and the process returns.

Here, the adjustment amount ADJ1 is data for adjusting the document stop position in the one-sided mode and the 2-in-1 mode.
To move the document stop position to the upstream side in the document transport direction, a plus value is input, and conversely, to move the document stop position to the downstream side, a minus value is input.
The adjustment amount ADJ2 is data for adjusting the document stop position in the duplex mode, and a plus or minus value is input according to the moving direction. ADJ3 indicates the amount of adjustment between the two documents placed on the platen glass 29 in the 2-in-1 mode. A plus value means that the document interval is widened, and a minus value means that the document interval is reduced. These adjustment amounts ADJ1 to 3 stored in the RAM of the copying machine body 1
Is transmitted from the CPU 1 of the copier body to the CPU 2 of the ADF 60, and the drive system is controlled based on the data.
Thus, the adjustment amounts ADJ1, ADJ2,
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 step 6-2, the eraser 13 removes the charge in the first half of the area on the photoconductor corresponding to the document placed on the document table glass. For example, if the area corresponding to the A3 size should be charged on the photosensitive member in view of the size of the document placed on the platen glass or the position of the document, the first half eraser flag is set to "1". Is set, the first half of the charged area on the photoconductor corresponding to the A3 size is illuminated to remove charges. 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", and if the second half erase flag is "1", it is placed on the platen glass 29 in S6-4. The eraser 13 removes the electric charges in the latter half of the region on the photoconductor corresponding to the original being placed. However, if the latter half erase flag is also "0", the inter-image portion is erased in S6-5.

More specifically, A of a format in which paper is fed from the last original
In the case of adopting the DF, 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 copying process for the original of the last page, and the CPU 1 Then, the original of the last page is set on the original platen glass 29 with its leading end coincident with the IP, and the charge on the photosensitive member corresponding to the area from the scale 120 to the original is removed. The latter half erase flag is set in the 2-in-1 mode, and is set to 2 of a pair of originals set on the platen glass.
Set to "1" when the original is large and C
The charge is transmitted to PU1, whereby the charge on the area on the photoconductor corresponding to the second document is removed. The second document is then entirely copied on a single sheet.

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

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

Counter DCNT1: Used to cause copy machine main body 1 to feed copy paper.
Is sent to the interrupt processing. 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 exchange of the original. The copier body 1 controls so that the number of sheets obtained by multiplying the value of DCNT1 by the number of copies is fed.

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

Counter DCNT3: Used to count the number of sheets ejected at the time of document exchange processing in the pre-step mode and the 2-in-1 mode. The number of originals set on the original platen glass 29 in the original exchange processing is set, and is decremented when the ejection of the original is completed.

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

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

Counter PLSCNT2: counts the number of pulses of main motor M3 since resist sensor SE2 was turned off. It is incremented during forward rotation and decremented during reverse rotation.

Counter SIZCNT1: Used to detect the size of a document. 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 the small-size original 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 driven forward to when it is turned off when a small-size document is conveyed in the pre-step mode, and is L / 2.
Is equivalent to

Pulse P03: The number of pulses from the start of forward rotation of the main motor M3 to the deceleration when the original is not a small size original in the pre-step mode. 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 to rotate forward until it is turned off, except when a small-size 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.
Next, when a large-size document is conveyed, the main motor M3
The number of pulses from deceleration drive to deceleration.

Pulse P06 (A4 horizontal feed + α or L /
2): When the large-size document is conveyed following the two small-size documents on the platen glass 29 in the 2-in-1 mode, the number of pulses from when the main motor M3 is driven to rotate forward until it is turned off ( Stop temporarily to discharge the previous document).

Pulse P07: the number of pulses from when the registration sensor SE2 is turned off to when the main motor M3 is driven to rotate in the reverse direction when a small-size original is conveyed in the 2-in-1 mode.

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

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

Timer T101: Pickup motor M1
Is turned off and then the paper feed motor M2 is turned on.

Timer T102: The timing at which the sheet feeding motor M2 is turned off after the registration sensor SE2 is turned on.

Timer T201: The timing at which the stopper solenoid SL1 is turned off after the main motor M3 is turned off.

Timer T202: Pickup motor M after registration sensor SE2 is turned off in 2-in-1 mode
1 is turned on.

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

Timer T401: 2 in the second embodiment.
When the last two originals are discharged in the IN1 mode, a timing is taken in which the main motor M3 is turned on after being turned on.

Timer T501: In the second embodiment, 2
When the document is switched back in the in-one mode, the main motor M3 is driven to rotate in the reverse direction and then turned off.

FIG. 71 shows a main routine of the CPU 2 for controlling the ADF 60. When the power is turned on and the CPU 2 is reset and the program starts, SS1
Performs initial settings for clearing the RAM, resetting various registers, and setting various devices to the initial mode. Subsequently, the internal timer is started in SS2. The internal timer determines the time required for one of the main routines, and its value is set in SS1. The internal timer also serves as a reference for counting various timers appearing in a subroutine described below.

Next, the subroutines of SS3 to SS7 are sequentially called, necessary processing is performed, and the process returns to SS2 after the internal timer is terminated in SS8. SS3 is AD
This is a subroutine for checking the opening and closing of each opening / closing mechanism for opening / closing processing of the document table glass of F and jam clearance of the ADF, and determining whether each part is open or closed. SS4 is a subroutine for setting the document transport speed of the ADF 60. SS5 is a subroutine for exchanging documents on the platen glass 29. SS6 is a subroutine for counting various timers. SS7 performs other processing, that is, A / D conversion, input processing, output processing, paper jam detection, and the like.

As shown in FIG. 72, the interrupt processing for the CPU 2 includes various interrupt processing such as controlling the main motor M3 in SS9, and data transmission processing and data reception processing with the CPU 1 in SS10 and SS11. The processing is performed as appropriate regardless of the processing in.

<< Initial Setting >> FIG. 73 shows a subroutine of initial setting (SS1) 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. In SS1-3, each flag is reset. In SS1-4, each motor M1, M2, M
3, M4, the scale solenoid SL1 is 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 end regulating plate and the pressing plate are at the initial home positions. In SS1-7, other initial settings are processed.

<< Home Check >> The home check subroutine shown in FIG.
It is checked whether or not 0 (collectively referred to as “pickup unit”) should be at 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
If both the SE1 and SE2 are off, that is, if there is no original in the original tray 61 and there is no original in the advance position, the original feeding status K is set to "1" in SS1-6-3. Then, a process for returning the pickup unit to the home position is executed. If there is a document in either the document tray 61 or the advance position and either the sensor SE1 or SE2 is on, SS1-6
In step -4, the paper feed status K is set to "2", and the process of returning to the home position is not executed, and the current state is maintained.

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

<< Check for forgetting >> FIG.
6 shows details of the forget-to-take check subroutine. In this subroutine, first, the sensor SE1 is determined in SS3-6-1.
Is turned on, that is, whether or not there is a document on the document tray 61. If the sensor SE1 is off (there is no original), the forgotten flag 1 and the forgotten flag 2 are reset to "0" in SS3-6-10.
On the other hand, if it is determined that the sensor SE1 is on (there is a document), it is determined in SS3-6-2 whether the sensor SE2 is off, that is, whether or not there is a document at the advance position of the registration roller, and the sensor SE2 is turned off ( If there is no manuscript) SS3
At -6-3, the forgotten flag 1 is reset to "0", and if the sensor SE2 is turned on (there is a document), SS3-6-
In step 4, the forgetting flag 1 is set to "1". Next, 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 a document), the forgetting flag 2 is set to "1" in SS3-6-7.
Set to. When the forgotten flag 1 and the forgotten flag 2 are set by the above processing, it is determined in SS3-6-8 whether the forgotten flag 1 and the forgotten flag 2 are "0", that is, there is no forgotten document. If any of the forgotten flags 1 and 2 is set to "1", the copying process is prohibited and the process returns. As a result, in SS2-6-9, when a document is set on the document table tray 61, the presence or absence of a document left in the ADF 60 is checked and copy processing is prohibited, so that the user can respond quickly. In addition, if an operation panel or the like is provided to display the location of the missing document, the position of the missing document can be immediately recognized, and prompt response can be made.

<< 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 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 speeds depending on the model of the copying machine body.

The belt speed V1 is a speed at which 100% copy productivity is maintained in combination with a model of A4 horizontal feed and a copy speed of 60 cpm. In other words, it means the speed at which the document can be replaced within the return time of the optical system 20. Specifically, assuming that the system speed of the main body of the copying machine is 300 mm / sec, the scan length in the A4 horizontal feed is 210 mm. The return time of the optical system 20 is (60 sec / 60 cpm) − (210 mm / 300 mm
/ sec) = 0.3 sec (cpm: cycle perminitut
e). As shown in FIG. 28, assuming that 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 replacement in the pre-step mode is L / 2, and the document replacement time is (L / 2V1). Then L
/2V1≦0.3 and V1 ≧ L / 2 × 0.3.

As for belt speed V2, copy speed is 4
The copying machine body of 5 cpm and the belt speed V3 correspond to the copying machine body of 30 cpm copy speed. Here, V1>V2> V3.

The belt speed V0 is a speed at which the first document is transported to the exposure reference position SP, and is set to a value larger than the belt speed V1 so as not to lower the copy productivity. Also, the belt speed is
In a mode other than the pre-step mode, that is, in a two-sided document transport mode, a document count mode, and the like, V0 is also set.

In this subroutine, first, SS4-1
It is determined whether or not the processing for setting the first document at the exposure position SP is completed. Before completion, SS4-2
To set the belt speed to V0. If completed,
At SS4-3, it is determined whether or not the mode is the pre-step mode. If not, the process proceeds to SS4-2.
In the pre-step mode, the copy speed is checked in SS4-4. The copy speed is checked based on the copy speed data of the copying machine 1 transmitted from the CPU 1. If the copy speed is 60 cpm,
Set the belt speed to V1 with SS4-5, 45 cp
If m, the belt speed is set to V2 in SS4-6. If the speed is 30 cpm, the belt speed is set to V3 in SS4-7. If 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, V3, SS4-9, SS4-10, SS4-1, respectively.
At step 1, the current control value is set to I1A, I2A, I3A.

Next, as shown in FIG.
In step SS4-15, the main motor M is used for reversing the original from the back side to the front side in duplex mode in SS4-15.
It is determined whether or not No. 3 is rotating forward. And AD
If F60 is set to any of these states, the load on the conveyor belt 95 is small at that time, so that the main motor M3 is controlled in the normal trapezoidal control in SS4-13 (see FIG. 79A). Further, in this state, it is unnecessary to pull out the document from the separation portion, and an excessive load is not applied to the main motor M3. Therefore, the current control value is reduced by about I4A in SS4-14. On the other hand, if the final document is not being discharged or if the front side of the document is not being set in the duplex mode, it is determined in SS4-16 whether the main motor M3 is decelerating, and the speed is being reduced (see FIG. 79A). ), The required torque of the main motor M3 is small, and the document is not picked up at the loosening portion, so that the load is small. Therefore, in SS4-14, the current control value is reduced by about I4A. However, SS4-1
2, SS4-15, SS4-16, when it is determined that the final document is not being discharged, the front surface of the document is not being set in the duplex mode, or the main motor M3 is not decelerating, that is, the registration unit or loosening When the loop of the original stopped at the advance position is eliminated when the original exists in the copy unit, the load applied to the main motor M3 is large at this time, and the stepping motor M3 is driven at a constant low speed until the loop is eliminated. Is driven to perform acceleration control when the loop is canceled (SS4-17) (FIG. 79).
(See (b) and (c)). When the original is pulled out from the separation section, an excessive load is applied to the stepping motor M3. At this time, the current value is maintained in a normal state. 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
In addition to the method of setting based on the data transmitted from the PU1, the setting may be performed by a dip switch built in the ADF 60. Alternatively, this type of data detection means may be provided in a contact portion of the ADF 60 with the copying machine main body 1. Specifically, a magnet indicating the copy speed is installed on the upper frame of
A sensor for detecting the magnet is installed in F60. The CPU 2 reads the copy speed of the copying machine main body 1 based on the signal from the sensor and indicated by the magnet, and sets the belt speed.

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

First, after performing the sheet feeding process in SS5-1, the MODE is determined in SS5-2. When MODE is "0", a start check is processed in SS5-3. When "1", pre-step set with SS5-4,
In step SS5-5, the sheet is discharged. SS5 for "2"
In step S6, a 2-in-1 set is processed, and in SS5-7, the sheet is discharged.
If "3", count the number of documents in SS5-8, SS
In 5-9, the count discharge is processed. SS for "4"
In step 5-10, the sheet feeding process for the duplex mode is executed, and
At 5-11, a paper discharging process is performed. If MODE is a value other than the above, other operations, for example, a double-sided mode, are processed in SS5-12.

<< Start Check >> FIG. 81 shows SS5-3.
Shows the subroutine of the start check executed by the subroutine.
This subroutine is executed when MODE is "0", that is,
The processing is performed 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 the switch is not turned on, the original has not been set on the tray 61 yet, and the DC is determined in 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, DCNT1 is set to "1", and SS5-3
At -4, it is determined whether or not the flag DCHG is "1". The flag DCHG is a command requesting replacement of a document 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 scan for the number of copies is completed. Therefore, the flag D
If CHG is "0", return immediately. If it is "1", reset this flag DCHG to "0" in SS5-3-5 and set status K to "3" in SS5-3-6. . The status K is used in the subroutine of paper feeding, and is set to “3” to feed the documents one by one.

Next, the original mode is checked in SS5-3-7. SS5-3-8 in pre-step mode
To set MODE to "1", for 2-in-1 mode, set MODE to "2" in SS5-3-9, and for duplex mode, set MODE to "4" in SS5-3-10. If in the count mode, SS5-3-11
To set MODE to "3". In the other document modes, the description is omitted. In the case of the count mode, this subroutine is terminated. In the case of the pre-step mode and the 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 setting >> FIG. 82 shows SS5-3-1.
3 shows the processing content 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 of the operation panel is turned off. Is set. The thin paper mode setting switch 105a can be freely operated by the user, and is pressed when the original is thin paper. In SS5-3-102, it is determined whether the stop position adjustment mode is set or not.
At -3-103, it is determined whether or not the one-sheet set flag is set to “0”. This one piece set flag is 2
In the in-one mode state, when the number of originals is an odd number, the last page original (which is fed first in the copying machine of the present embodiment) is set to “1” when the original is set on the original platen glass 29. You. 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 single sheet set flag is set to “0”.
Is set, the processing of SSS5-3-105 to SSS5-3-107 is executed; otherwise, the processing of SS5-3-108 to SS5-3-111 is executed.

In SS5-3-104, the thin paper flag is reset to "0", and SS5-3-105 and SS5-3 are set.
In steps -106 and SS5-3-107, the counters PO2, PO4, and PO8 that specify 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 and SS5-3 are set.
At -110 and SS5-3-111, the document feed amount counters PO2, PO4, and PO8 are respectively set to L / 2, L,
Set to SB. Here, SB is the number of pulses of the stepping motor required to switch back the first original once in the 2-in-1 mode, and when SB is increased, the rear end of the first original and the leading end of the second original And the distance between
Conversely, when the SB is reduced, the above-mentioned interval becomes longer. In other words, in the application 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 for defining 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, a document feed amount counter PO2 in the one-sided mode, a single-sided large-size document feed amount counter PO4, a document feed amount counter PO14 for reversing the document in the double-sided mode, and a document feed amount PO8 required for switchback.
To (PO2 + ADJ1 / 2), (PO4 + ADJ1 / 2)
J1), (PO14-ADJ2), (PO8-ADJ)
Update to 3). Note that the counter correction amounts ADJ1, ADJ
J2 and ADJ3 are input from the copying machine body 1 (FIG. 68).
reference). As described above, even in the normal mode (applying mode), when the number of originals is an odd number and only the last page original is set on the original platen glass, the document feed control based on the pulse control is started. Therefore, the document can be accurately stopped at a position where there is no scale.

<Sheet Feeding> FIGS. 83 to 87 show a sheet feeding subroutine executed in SS5-1. In this subroutine, the paper feed status K is checked in SS5-1, and the following processing is performed based on the values "0" to "8". When the status K is "1", the tip regulating 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 rotated in reverse at SS5-1-2, and it is determined at SS5-1-3 whether or not the cam sensor SE11 is off-edge. The home position of the leading end regulating plate 63 is a regulating position (upward movement) for the original, and the pressing plate 70
The home position is a pressing release position (upward movement) with respect to the document. When the pickup motor M1 connected to the camshaft 147 is rotated in the reverse direction and the cam sensor SE11 is turned off by being shielded from light by the edge portion 148a of the disk 148, both are set to the home position (the position in FIG. 19). Therefore, when the off-edge of the cam sensor SE11 is confirmed in SS5-1-3, the pickup motor M1 is turned off in SS5-1-4, and the status K is set to "2" in SS5-1-5.

When the status K is "2", no processing is performed. When the status K is “3”, the tip regulating plate 6
3 is moved to the retracted position, and at the same time, the pressing plate 70 is moved down to apply the paper feeding pressure to the original. That is, it is determined in SS5-1-6 whether or not the document is the first document. If it is not the first document, the leading end regulating plate 63 is at the retracted position and the pressing plate 70 is at the release position (sensor SE12). Detects the edge portion 149a, the position of FIG. 20), rotates the pickup motor M1 forward in SS5-1-7, and detects the cam sensor SE in SS5-1-8.
It is determined whether or not 11 is an off-edge. By the forward rotation of the pickup motor M1, the cams 145 and 146 rotate counterclockwise from the position in FIG. 20, and the cam sensor SE11 is shielded by the edge 148b of the disk 148 and turned off.
At this time, as shown in FIG. 21, the leading end regulating plate 63 maintains the retracted position, and the pressing plate 70 presses the leading end of the document against the pickup roller 65. Therefore, when 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-
At 1-11, the timer T104 is set, and SS5-1-1 is set.
At 2, the status K is set to "5". On the other hand, SS5
If it is determined in -1-6 that the document is the first document, SS5
At −1-13, the main motor M3 is turned on, 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 of the main motor M3 is adjusted and the pickup motor M1 is rotated in the reverse direction from the home position to the pressing position in SS5-1-15. Then, the main motor (stepping motor) M3 is rotated for a predetermined time, and it is determined whether or not the process of adjusting the phase of the main motor M3 and eliminating the backlash of the driving system is completed. Here, the circuit of the main motor M3 is shown in FIG. In this circuit, the stepping motor M3 rotates by receiving a drive signal in the order of A-phase → A′-phase → B-phase → B′-phase, and outputs the current control output and the A-phase of the main motor M3. The drive signal is provided 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. When the current control output value becomes large (+), the comparator 1000 Outputs an "H" signal. Next, the AND gate 2000 performs an AND operation on the A-phase drive signal of the main motor (stepping motor) M3. If the drive signal is also turned on, that is, if it is in the “H” state, the transistor 4000 drives the A-phase. Apply current. In this figure, only a circuit diagram for giving an ON signal to the A phase is shown as an example, but the A ′ phase, the B phase, and the B ′
Similarly, the main motor M3 is rotationally driven by the drive signal flowing in the order of A phase → A ′ phase → B phase → B ′ phase. However, the main motor M3
Is forcibly rotated, for example, when starting from the A ′ phase and the B ′ phase, the motor rotation shaft once reversely rotates and A
The process returns to the phase B and the phase B, and the normal rotation operation starts from there, and the number of pulses sent to the main motor M3 does not match the amount of sending. Further, the drive system is provided with a number of gears, toothed belts, and the like. At the time of starting, the state shifts from a state in which the backlash of each gear is eliminated to a normal rotation operation. So SS5-1
In step 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 caused by the reverse rotation of the main motor M3 and the backlash of the drive system. It is determined whether or not the value (P00) has been reached.
Becomes P00, the main motor M3 is stopped (SS5).
-1-16). Therefore, the count value P00 must be a value necessary for adjusting the phase of the main motor M3 and eliminating the backlash of the drive system. For example, when the start switch of the copying machine is turned on as shown in FIG. Since the motor M3 performs two-phase excitation, it is desirable that the main motor M3 be rotated by at least four pulses. what if,
Eight or more pulses are required for 1-2 phase excitation.

Next, in SS5-1-17, the motor M1 is rotated in the reverse direction to move the leading end regulating plate 63 down to the retracted position.
Is moved down to the pressed position. Sensor S with SS5-1-18
Edge portion 14 of disk 149 due to the off-edge of E12
When 9b is detected, the motor M1 is stopped in SS5-1-19. Thereby, the position of FIG. 19 is changed to the position of FIG. Then, the motor M2 is driven in SS5-1-20 to convey the document forward, and the timer T is set in SS5-1-21.
103 is set, the status K is set to "5" in SS5-1-22, and the routine returns. 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 has jammed. SS5-1
The timer T104 set at 11 is a similar jam detection timer, but the timer value has a relationship of T104 <T103, and the first sheet is slightly longer. This is because the leading edge of the first document is located at the leading edge regulating plate 63,
The sheet is fed slightly after the first sheet, and is set in consideration of the fact that the sheet comes near the nip portion between the sabaki roller 75 and the sabaki pad 80. This prevents the timer value of the first sheet from being too short and causing a large number of jams, and the timer values of the second and subsequent sheets from being too short and damaging 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 (there is a document) of the sensor SE2, and another timer T102 is determined at SS5-1-24 where the on-edge is detected. Set, S
In S5-1-25, the timers T103 and T104 are reset, the document counter DCNT2 is incremented, and the status K is changed to "6" in SS5-1-27. On the other hand, if no original is detected in SS5-1-23,
Timers T are used in S5-1-28 and SS5-1-29, respectively.
It is determined whether 103 and T104 have been completed, and if the processing has been completed, the paper feed jam is determined in SS5-1-30.

When the status K is "6", the end of the count of the timer T102 is confirmed in SS5-1-31 as shown in FIG. When the timer T102 expires, the leading end of the document has hit the nip of the registration roller to form a loop. And the timer T
When the end of 102 is confirmed, SS5-1-32 determines whether the width sensor SE10 is on or off. Width sensor SE1
0 is for detecting the width dimension of the fed document,
If it is on, the width flag is set to "1" in SS5-1-33, and if it is off, the width flag is reset to "0" in SS5-1-34. Subsequently, the feed motor M2 is turned off in SS5-1-35, and the pickup motor M1 is reversed in SS5-1-36. Thus, only the pressing plate 70 starts moving upward to the pressing release position. At this time, the tip regulating plate 63
Keeps the evacuation position. Further, SS5-1
At -37, the status K is set to "7".

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

Thus, the document feeding process is completed. When the status K is "8", no processing is performed. As described above, the rotation direction of the pickup motor is changed between the first sheet and the others (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 forward. This means that the first sheet rotates from the home position (the position in FIG. 19) to the pressing position (the position in FIG. 21), and the other sheets rotate from the pressing release position (the position in FIG. 20) to the pressing position (FIG. 21). This is because the rotation angle is reduced to shorten the operation time. At this time, if the same sensor detects the same edge portion, the position where the motor finally stops due to overrun of the motor is shifted from the position in FIG. 21 in different directions. In that case, the shape of the cam 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 operation time. Would. Therefore,
In the present invention, the edge portion 149b is detected by the off-edge of SE12 on the first sheet (at the time of M1 reverse rotation), and the other section (M1
(1 forward rotation), the edge portion 14 due to the off edge of SE11.
8b is detected to turn off the motor M1, and these positional relationships are designed such that the position at which the cam stops with overrun is the position shown in FIG. Therefore, the stop position due to the overrun of the motor does not shift due to the difference in the rotation direction. 89 to 96 show a pre-step set subroutine executed in SS5-4. In this subroutine, as shown in FIG.
Check set status S with 1 and set its value to "0"
The following processing is performed based on .about. "9".

As shown in FIG. 90, when the status S is "0", no processing is performed. When the status S is "1", the main motor M3 is normally rotated at high speed in SS5-4-2. As a result, the original is fed from the registration roller 90 onto the platen glass 29. And SS
In 5-4-3, it is determined whether or not the PLSCNT1 has counted the pulse P01. PLSCNT1 is pulse P01
Is counted, the registration sensor S is determined by SS5-4-4.
It is determined whether or not E2 is off, and it is determined whether or not the empty sensor SE1 is on in SS5-4-5. Pulse P01
Is the number of pulses corresponding to a small-size document. If the registration sensor SE2 is off and the empty sensor SE1 is on, that is, if the fed document is small and the next document remains on the tray 61 , SS5-4-6 to set the status K to "3", SS5-4-7 to decelerate the main motor M3, and SS5-4-8 to set the status S to "2".

On the other hand, if the registration sensor SE2 is ON, the document is large, so the flag LSIZE is set to "1" in 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" in SS5-4-9, and
In step S5-4-11, the status S is set to "7".

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

When the status S is "2", it is determined whether or not PLSCNT1 has counted the pulse P02 in SS5-4-16 as shown in FIG. Pulse P0
Reference numeral 2 denotes the number of pulses required to convey the document by the 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 in SS5-4-17, and the status S is set to "3" in SS5-4-18. When the PLSCNT1 is counting the pulse P02, the above-described SS5-4-12 to SS5-4-15
Process.

When the status S is "3", no processing is performed as shown in FIG. As shown in FIG. 92, when the status S is "4" (complete advance feeding of the next document), the main motor M3 is rotated at high speed in SS5-4-19. As a result, the preceding document is transported to the exposure position, and the subsequent document is transported to the pre-step position. And SS
If it is determined in 5-4-20 that the PLSCNT1 has counted the pulse P01, it is determined in SS5-4-21 whether or not the registration sensor SE2 is off. In SS5-4-22, whether or not the empty sensor SE1 is on is determined. judge. If the sensor SE2 is off and the sensor SE1 is on, that is, if the succeeding document is small and the next document remains on the tray 61, the feed status K is set to "3" in SS5-4-23.
, The main motor M3 is decelerated at SS5-4-26, the scale 120 is protruded at SS5-4-27 (in the case of the scale mode), and the status S is set to "5" at SS5-4-28. .

On the other hand, if the registration sensor SE2 is turned on, the subsequent original is large, so that SS5-4-
At 25, the advance prohibition flag is set to "1", and the aforementioned S
Process S5-4-26 to S28. If the empty sensor SE1 is off, there is no next original, so SS5
In step -4-24, the paper feed status K is set to "1", and the above-described SS5-4-26 to 28 are processed. PLSCNT
When 1 is counting the pulse P01 (SS5-
NO at 4-20), SS5-4-12 to 15 are processed,
Detect the size of the subsequent document.

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

When the status S is "6", as shown in FIG. 94, it is determined at SS5-4-34 whether or not the flag DCHG is "1", and the following processing is performed only when the flag DCHG is "1". . The flag DCHG is transmitted from the CPU 1 of the copier main body 1 to request the ADF 60 to replace the original.

If the flag DCHG is "1", SS5
The value of the paper feed status K is checked in -4-35. 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" in SS5-4-36, and the flag LSIZE is "1" in SS5-4-37. It is determined whether or not. Flag LSIZ
If E is "1" (if a large-size document has been fed), the status S is set to "1" in SS5-4-38, DCNT1 is decremented in SS5-4-39, and SS5 is set. In step -40, DCNT3 for counting the number of originals to be discharged is set to "1". If the flag LSIZE is "0" (if a small-size document has been fed), the status S is set to "4" in SS5-4-41, and the above-mentioned SS5-4-39 to 40 are processed. I do.

The status K is "2" in SS5-4-35
(When the next original is not fed, that is, when there is no next original or in the advance state), SS5-
In step 4-42, it is determined whether DCNT1 is "0".
If it is "0", it is determined in SS5-4-43 whether the advance prohibition flag is "1". If the advance prohibition flag is “1”, the flag LSIZE is set to “1” in SS5-4-44.
And status S is set to "7" at SS5-4-45.
And processes the above-mentioned SS5-4-39 to 40. If the advance prohibition flag is “0”, the above-mentioned SS5
-4-41, SS5-4-39 to 40 are processed. DC
If NT is not "0", the status S is set to "9" in 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 forward at high speed in SS5-4-47. As a result, the large-size document is moved to the intermediate position IP.
Transported from Then, the PLSC in SS5-4-48
It is determined whether or not NT1 has counted the pulse P03. When PLSCNT1 counts pulse P03,
In SS5-4-49, it is determined whether or not the registration sensor SE2 is off. In SS5-4-50, the empty sensor SE1 is determined.
Is turned on. If the registration sensor SE2 is off and the empty sensor SE1 is on, the status K is set to "3" in 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 case of the scale mode).
To set the status S to "8".

If the registration sensor SE2 is on,
At this time, the rear end of the large-size document
0, the paper jam is processed in SS5-4-56. If the empty sensor SE1 is off, there is no next document, so the status K is set to "1" in SS5-4-52, and the above-described SS5-4-53-5 is set.
Process 5. When the PLSCNT1 is counting the pulse P03 (NO in SS5-4-48), the above-mentioned 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 whether or not PLSCNT1 has counted the pulse P04 in SS5-4-57. If YES, that is, when the leading end of the large-size document reaches the exposure reference position SP, the main motor M3 is turned off in SS5-4-58. Then, at SS5-4-59, the solenoid SL1
Is turned on, the scale 120 is projected upward from the upper surface of the platen glass 29, and the flag DSET is set in SS5-4-60.
Is set to “1” and the status S is set in SS5-4-61.
Is set to “6”. PLSCNT1 is pulse P04
Is being counted, SS5-4-53 to 5
Process 5.

When the status S is "9", SS5-
In step 4-62, the main motor M3 is rotated forward at high speed. Thus, the document is discharged from the exposure position. And SS5-
When the off-edge of the discharge sensor SE3 is confirmed in 4-63, that is, when the rear end of the document is separated from the transport 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, MODE in SS5-4-66
Is reset to "0", and the status S is reset to "0" in SS5-4-67.

Here, detection of a paper jam in the pre-step mode will be described. When the status S is "1", even if the registration sensor SE2 is on (SS5-
Do not clear the paper jam (even if NO at 4-4). However, when the status S is "7", the original is pulsed P0.
If the registration sensor SE2 is turned on after transporting for three minutes (NO in SS5-4-49), the paper jam is processed.
That is, the pulse P03 is set slightly shorter than the distance L (see FIG. 28), and the determination of NO in SS5-4-49 means that the document is longer than L (500 mm) or the registration roller This is the case where it stays near 90. In such a case, a paper jam is detected. When the status S is "4", the registration sensor SE
Even if 2 is on (NO in SS5-4-21), the advance prohibition flag is set to "1", but the paper jam is not processed. With the above-described processing, even if large-size documents are mixedly set on the tray 61 in the pre-step mode, the documents can be conveyed without any trouble.

<< Scale >> FIG. 97 shows the scale (SS5-
4-27, SS5-4-54, SS5-6-33). Here, in SS5-4-101, it is determined whether or not the thin paper flag is "0". If it is "0" (if the scale mode is selected), SS5-4-10 is set.
2, the solenoid SL1 is turned on, the scale 120 is slightly protruded above 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,
A subroutine for high-speed normal rotation of the main motor M3 executed in SS5-4-62) is shown. Here, SS5-4-
At 201, SS5-4-211, it is determined whether or not the main motor M3 is turned off. If the main motor M3 is already turned on, this subroutine is immediately terminated. If it is determined in SS5-4-201 that the switch is off, that is, if the set status S is "1", "4", or "9", SS5-4-2
02, the flag LSIZE is reset to “0” and SS5
At -4-203, PLSCNT1 is reset to "0",
In SS5-4-204, the first and second half erase flags are reset to "0". Subsequently, the advance prohibition flag is reset to “0” in SS5-4-205, and SS5-4-205 is set.
At 206, the flag DCHG is reset to "0" and SS5
At step 4-207, the flag DSET is reset to "0". Further, the discharge status H is set to "1" in SS5-4-208, and the solenoid S is set in 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 normal rotation, and interruption is permitted. The main motor M3 is driven every time this interruption occurs, and the count is performed in the PLSCNT1 and the PLSCNT2. On the other hand, in SS5-4-211 the main motor M
3 is turned off, that is, when the set status S is "7", the aforementioned 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.
In step 5-6-1, the status S is checked, and the value “0” is checked.
The following processing is performed based on .about. "13". Status S
If is "0", nothing is processed. As shown in FIG. 100, when the status S is “1” (paper feeding is completed), S
At SS5-6-2, the main motor M3 is rotated forward at high speed.
As a result, the original is fed 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 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 by SS5-6-4. Next, the single-sheet set flag is determined in SS5-6-5, and if the single-sheet set flag is "0", SS5-6-6 is set.
It is determined whether or not the empty sensor SE1 is on. When the registration sensor SE2 is off-edge and the empty sensor S
If E1 is ON, that is, if the fed document is small and the next document remains on the tray 61, SS5-6-
7, the timer T202 for feeding the next original is set, and the main motor M3 is decelerated at SS5-6-8.
In 5-6-9, the status S is set to "2".

On the other hand, if it is determined in SS5-6-6 that the empty sensor SE1 is off, that is,
If the last document is one because the number is an odd number, there is no next document, and the second half erase flag is set to "1" in SS5-6-10. The latter half erase flag instructs to erase 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 or not DCNT3 is “2”,
If "2", that is, if two originals to be discharged at this time are on the platen glass 29, the main motor M3 is decelerated at SS5-6-12, and the status S is changed to "8" at SS5-6-13. Set to If DCNT3 is not "2", the status S is set to "5" in 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
It is determined whether or not PLSCNT1 has counted the pulse P05. The pulse P05 is a pulse number larger than the pulse number until the small-size document passes through the resistance sensor SE2. If the pulse P05 is counted before the resistance sensor SE2 is turned off, it is a large-size document.
At step 15, the flag LSIZE is set to "1", and the above-described SS5-6-11 to SS13 or SS5-6-14 are processed. If it is determined in SS5-6-5 that the one-sheet set flag is "1", that is, if it is previously determined that the number of sheets is an odd number based on the result of the document count and the size of the document is small, SS5-6-5
At step -6-17, the status S is set to "12".

When the status S is "2", SS5-
In 6-18, it is determined whether or not the count of the timer T202 has ended. After finishing the counting, SS5-6
When it is determined at 19 that the paper feed status K is “2”,
In SS5-6-20, set status K to "3",
Advance feeding of the next document is started. Whether the count of the timer T202 has not ended or the status K
Is not "2", PLSCNT in SS5-6-21
It is determined whether or not 2 has counted the pulse P07. P
When LSCNT2 counts pulse P07, SS5
At -6-22, the main motor M3 is switched to the low-speed reverse rotation. Here, the document starts switchback. Then, the status S is set to "3" in SS5-6-23.

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

When the status S is "3", the status shown in FIG.
As shown in (5), it is determined whether or not PLSCNT2 has counted the pulse P08 in SS5-6-24. When the counting is completed, the main motor M3 is turned off in SS5-6-25. This completes the switchback of the original. Then, the status S is set to “4” in SS5-6-26.
Set to. When the status S is "4", no processing is performed.

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

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

In SS5-6-35, the registration sensor SE2
Is determined to be on, the flag LS is set in SS5-6-40.
It is determined whether or not ISE is “0”. If YES, a large-size document is set two-in-one after a small-size document, so only the first small-size document is set in SS5-6-41. Is set to "1" in order to copy. Further, the advance prohibition flag is set to "1" in SS5-6-42, and DCNT is set in SS5-6-43.
1 is incremented, and the above SS5-6-38 is processed. If it is determined in SS5-6-40 that the flag LSIZE is "1", the large-size original is sent alone to the position of the scale 120, but the registration roller 9
Since it stays near 0, SS5-6
At 44, it is processed as a paper jam. If it is determined that the PLSCNT1 is counting the pulse P03 (SS5-6-3)
2; NO), 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 (5), it is determined whether or not PLSCNT1 has counted the pulse P04 in SS5-6-45. If YES, that is, when the leading end of the document reaches the exposure reference position SP, the main motor M3 is turned off in SS5-6-46. At this time, if the succeeding document is of a large size, the latter half of the document remains in the paper feeding 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 of a large-size original), as shown in FIG. 105, SS5-6-5
When the PLSCNT1 confirms the end of the count of the pulse P06 at 0, the main motor M3 is turned off at SS5-6-51. Further, the status S is set to "9" in SS5-6-52.

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

When the status S is "10", FIG.
As shown in FIG. 06, the main motor M
3 is rotated at high speed. Thus, the original is discharged from the exposure position. Then, in SS5-6-56, the discharge sensor SE3
When the trailing edge of the document to be ejected is detected, that is, when the trailing edge of the document is separated from the transport belt 95, SS5-6-5
At 7, the main motor M3 is turned off. Thereby, when two originals are discharged at the same time, a space is provided between the originals. Next, in SS5-6-58, the solenoid SL1 is turned off and the scale 120 is raised. Also, SS5-6
In step 59, it is determined whether or not DCNT3 is "2". If "2", the status S is set to "11" in SS5-6-60. If not, the status S is not "2". Only), the status S is reset to “0” in SS5-6-61.

When the status S is "11", SS5
At −6-62, it is determined whether or not DCNT3 is “1”,
If "1", the status S is set to "1" in SS5-6-63.
Set to "0". This causes the subsequent document to be discharged.
If DCNT3 is not "1", that is, if DCNT3 is "2", no processing is performed because the document is discharged earlier.

In the case where the status S is "12", FIG.
Is performed. 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 the last page original to be set first is placed on the original glass 29. It is 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 application 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 platen glass 29 away from the scale 120 by the size of the document.
And when PLSCN1 becomes (P04-size P),
Since the document is set on the platen glass 29 at a distance corresponding to the size of the document from the scale 120, SS 5-6 is set.
At -65, the main motor M3 is turned off. Next, SS5-
At 6-66, the solenoid SL1 is turned off and the scale 120 is turned off.
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 corresponding to the area where there is no original on the platen glass 29 is set. After removing the electrostatic latent image on the photoreceptor, the single sheet set flag is reset to "0" in SS5-6-69. Subsequently, the sensor SE1 is set in SS5-6-70.
Is turned on, and it is confirmed that the original remains on the original tray 61, the DCNT1 is set to "+" in SS5-6-71.
"1" is incremented, the status K is set to "3" in SS5-6-72, and the status S is set to "13" in SS5-6-73. If it is confirmed in SS5-6-70 that there is no original on the original tray 61,
At step 6-74, the status K is set to "1". As described above, when the number of originals is an odd number, the final original is set at a position apart from the scale 120 by the original size from the exposure reference SP on the original platen glass 29, that is, at the intermediate position IP. In this case, since one small-size document is set in the second half, the first half erase flag is set to half erase the first half. Even if the number of sheets is counted as odd and the one-sheet set flag is set, if the original is large in actual copying, the process proceeds from SS5-6-15 to SS5-6-16, so the scale 120 is set. Set alone, no erasing is performed. If there is only one last document as a result of passing the sheet to the end, the latter half erase flag is set to set it on the scale side (SS-5-6-10). Even when the small-sized document and the large-sized document are two-in-one, only the small-sized document on the scale side is copied, and the large-sized document side sets the latter half erase flag to erase. And
The large-size document is then subjected to a copy process and a full copy is made, so that there is no extra copy, no shadow or dirt on the belt in the margins, and no copy loss. Is obtained.

FIG. 108 shows that the status S is "7" or "1".
3 ". Here, SS5-6-75
To determine whether the flag DCHG is "1" or not, and perform the following processing only when it is "1". If the flag DCHG is "1", the value of the paper feed status K is checked in 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" in SS5-6-77, and the status S is set in SS5-6-78. Set to “1”. Furthermore, SS5-6-7
In step S9, it is determined whether or not the flag LSIZE is "1". Flag L
If SIZE is "1" (if a large-size document has been 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 has been fed), it is determined in SS5-6-82 whether the second half erase flag is "1". If the second half erase flag is “1” (if one small-size original is being set or one small-size original and one large-size original are being set), the above-described SS5-6-81 is processed, If "0", it is determined in SS56-83 whether the first half erase flag is "1". If the first half erase flag is "0", SS is determined.
After incrementing DCNT3 in 5-6-84, S
Process S5-6-81.

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

<< Discharge >> FIGS. 109-111 show SS5-5.
The subroutine of the count discharge executed in 5-7 and 5-11 is shown. The paper discharge here is the pre-step mode and 2
This is a paper discharge in the IN1 mode. In this subroutine,
As shown in FIG. 109, the discharge status H is checked in 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", no processing is performed. When the status H is "1", the discharge motor M4 is driven at a high speed in SS5-5-2, and it is determined whether or not the main motor M3 is off in SS5-5-3. It is determined whether it is "0". The main motor M3 is off,
If DCNT3 is "0", there is no original to be discharged,
In SS5-5-5, the discharge motor M4 is turned off, and SS5-5
At -6, the status H is reset to "0".

If DCNT3 is not "0" even if the main motor M3 is turned on or off (during document discharge), it is determined in 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 in SS5-5-8, and the timer T301 is set in SS5-5-9. I do. Furthermore, status H is set to “2” in SS5-5-10.
Set to.

When the status H is "2", the status shown in FIG.
As shown in FIG.
Is completed, SS5-5-12 returns D
CNT2 is decremented and DCN is set in SS5-5-13.
Decrement T3. Subsequently, it is determined whether or not DCNT3 is “0” in SS5-5-14. If DCNT3 is "0", that is, if one document is to be discharged, the discharge motor M4 is turned off in SS5-5-15 and SS5-5
In 5-5-16, the status H is reset to "0".
If DCNT3 is not "0", that is, if the number of originals to be discharged is two, the status H is set to "1" in SS5-5-17 and the discharge operation is continued.

<< Count >> FIGS.
8 shows a count subroutine executed in step S8. In this case, the document is cycled through the subroutine of the count discharge described below, and the number of sheets is automatically counted. In this subroutine, as shown in FIG.
And checks the status S, and performs the following processing based on the values “0” to “4”.

As shown in FIG. 113, when the status S is "0", no processing is performed. If the status S is "1" (paper feeding is completed), it is confirmed that the discharge status H is not "2" in SS5-8-2, that is, if the discharge motor M4 is not decelerated, SS5- 8-3
The solenoid SL1 is turned on to lower the scale 120, and the main motor M3 is rotated forward at high speed in SS5-8-4. As a result, the document is sent from the registration roller 90 onto the platen glass 29. Further, PLSCNT1 is reset to “0” in SS5-8-5, and SS5-8-6 is set.
To set the status S to "2", and SS5-8-7 to set 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 rear end of the document passes the detection point of the sensor SE2), the size of the document is detected in SS5-8-9. Subsequently, the main motor M3 is decelerated in SS5-8-10,
In step S5-8-11, the GCNT for counting the number of documents is incremented, and in step SS5-8-12, PLSCNT2 is reset to "0". Further, it is determined in SS5-8-13 whether the empty sensor SE1 is on. If the sensor SE1 is on, the next document is fed,
In 5-8-14, DCNT1 is incremented and SS5
The paper feed status K is set to "3" at -8-15,
In step S5-8-16, the status S is set to "3".
If the sensor SE1 is off, there is no next document on the tray 61, so the feed status K is set to "1" in SS5-8-17, and the status S is set to "3" in SS5-8-16. set.

When the status S is "3", FIG.
As shown in (5), when it is confirmed that PLSCNT2 has finished counting the pulse P09 in SS5-8-17,
In S5-8-18, the main motor M3 is turned off. The pulse P09 is for temporarily stopping the document on the platen glass 29, and corresponds to the number of main motor drive pulses from when the trailing edge of the document is detected by the registration sensor SE2 until at least when it passes through the nip portion of the registration roller 90. .
By such control, the processing time in the count mode is reduced.

Next, the solenoid SL is set at SS5-8-19.
After turning off 1 and raising the scale 120, SS5-
In step 8-20, it is determined whether or not the discharge sensor SE3 is off.
In S5-8-21, it is determined whether the 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
In S5-8-22, the discharge motor M4 is turned off, and SS5-8
At -23, the status H is reset to "0". Then, SS5-8-24 determines whether the empty sensor SE1 is on or off. If the sensor SE1 is on, the status S is reset to "0" in SS5-8-25 to wait for the completion of feeding of the next document. If the sensor SE1 is off, the status S is reset in SS5-8-26. The status S is set to "4". Also, if the status H is "2" even if the discharge sensor SE3 is on or off, S
Process S5-8-24 to S26.

When the status S is "4", all originals have been sent out onto the platen glass 29, and
In 5-8-27, the main motor M3 is driven at a low speed. Then, if it is confirmed in SS5-8-28 that DCNT2 is "0", that is, if the document does not exist on the platen glass 29, the main motor M3 is set in SS5-8-29.
Is turned off, the solenoid SL1 is turned off at SS5-8-30, the scale 120 is raised, and the status S is reset to "0" at SS5-8-31. Next, SS5-8-
At 32, it is determined whether or not the GCOUNT, that is, the number of documents is an odd number. If the number is an odd number, the one-sheet set flag is set to "1" at SS5-8-33.

<< Count Discharge >> FIG. 115 shows a count discharge subroutine executed in SS5-9. In this subroutine, the discharge status H is checked in SS5-9-1, and the following processing is performed based on the values "0", "1", and "2". When the status H is "0", no processing is performed. When the status H is “1” (when the conveyance of the document by the forward rotation of the main motor M3 is started), S
In S5-9-2, the discharge motor M4 is driven at a high speed. Thereby, the reversing roller 100 and the discharge roller 110 rotate, and the document is sent to the tray 115. Next, SS5-9
When the off edge of the discharge sensor SE3 is confirmed at -3 (when the rear end of the document passes the detection point of the sensor SE3),
In SS5-9-4, the discharge motor M4 is decelerated. further,
At step SS5-9-5, the timer T301 is set.
In 9-6, the status H is set to "2", and SS5-9
At -7, DCNT2 is decremented.

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

<< Size Detection >> FIG. 112 shows a size detection subroutine. Here, the pulse count value of PLSCNT1 is stored in the size detection counter SIZCNT1 in SS5-4-201. The PLSCNT 1 counts the number of forward drive pulses of the main motor M3, and the value corresponds to the length of the document. Next, it is determined in SS5-4-202 whether the width flag is "1". The width flag is set by turning on / off the width sensor SE10, and the width sensor S
E10 is turned on by a document having a width equal to or larger than B5 horizontal feed, and the width flag is set to "1". The size of the document is set by a 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
Check the value of SIZCNT1 in -4-203, and if the value corresponds to 182 mm,
ZE is set to B5 horizontal feed. Hereinafter, similarly, SIZCN
According to the value of T1, SS5-4-205 to SS5-4-
In step 207, a predetermined document size is set in SIZE. If it is longer than 420 mm, it is determined to be unknown in SS5-4-208. Thereafter, the width flag is reset to "0" in SS5-4-209.

On the other hand, when the width flag is “0”, FIG.
As shown in FIG. 7, SIZCNT1 in SS5-4-210
Is checked, and according to the value, SS5-4-211
In step SS5-4-217, a predetermined document size is set in SIZE. If shorter than 297mm, SS5-4
In step 213, it is determined whether the switch SW2 is turned on. If the switch SW2 is turned on, the size is set to "A4L" in SS5-4-214.
In step 4-215, the size is set to "letter L". In the 2-in-1 mode, the detected sizes are set as twice as large. Here, SS5-
Steps 4-213 and 214 are other examples of the processing after S8-4 in FIG.

<< Duplex Setting >> FIGS. 118 to 124 are subroutines for processing the document conveyance in the duplex mode.
In S5-10-1, the status "S" is determined, 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 rotated forward at SS5-10-3 to set the document table. The original is conveyed along the glass 29, and the discharge motor M4 is driven by SS5-10-4. Next, at SS5-10-5, the off-edge of the registration sensor SE2 is detected, and when the off-edge, that is, the trailing edge of the document is detected, at SS5-10-6, the document size is detected from the signals of the sensors SE2 and SE10. Then, SS5-10
At -7, it is determined whether or not the document number counter DCNT3 is "0". This document number counter is a counter for counting the number of sheets to be discharged, and is set to "0" when the first and back sides are set and the front side is set. When the back side of the second and subsequent sheets is set, when the previous document is discharged, the state changes from “1” to “0”. If it is determined that the document number counter DCNT3 is "0", the on-edge of the discharge sensor SE3 is detected in SS5-10-8.
At S5-10-9, the solenoid SL2 is turned on to switch the claw 1
03 is operated to form a reversing path, and the original is conveyed again toward the original platen glass 29. Also, PLSCNT2 is reset to "0" in SS5-10-10, and counting is started from there. Status S in SS5-10-11
Is set to “2”.

When the status S is "2", as shown in FIG. 120, PLSCNT2 is set to P in SS5-10-12.
12, that is, whether the leading edge of the document that has passed the sensor SE3 has reached the position immediately before the transport belt 95 through the reversing path. Immediately before the leading edge of the document reaches the transport belt 95, the main motor M3 is rotated in reverse at SS5-10-13. In SS5-10-14, it is determined whether or not the document is a large size document.
Decelerate 3 and M4. In the case of a large-size document, both the leading edge and the trailing edge of the document are conveyed by the transport belt 95 and the platen glass 2.
9 and the load is increased. In such a case, the motors M3 and M4 are switched to low speed to prevent the stepping motor from stepping out and to reduce the paper passing noise. At this time, the scale 120 is placed on the platen glass 29.
The same operation and effect can be obtained even when the device is kept lowered from the upper surface. On the other hand, if the original is not a large-size original, SS5-1
The solenoid SL1 is turned off at 0-20 and the scale 120 is turned off.
To prevent the document leading edge from interfering with the glass end surface to prevent jamming and to prepare for document leading edge regulation. Next, S
In S5-10-16, the sensor SE3 and the off edge are detected, and when it is confirmed that the rear end 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 a path toward the document discharge tray 115, and SS5-10-18
Resets PLSCNT2 to “0” and sets SS5-10
At -19, the status S is set to "3".

When the status S is "3", as shown in FIG. 121, it is determined whether or not PLSCNT2 has become P14.
That is, the trailing edge of the original is 20 to 30 mm from the scale 120.
The document is moved to the distant position and the original is completely
Check if you have moved up. And PLSCNT2
Becomes P14, the main motor M at SS5-10-22
3 is switched to the normal rotation state. As a result, the document is conveyed on the platen glass 29 toward the scale 120.
In SS5-10-23, the paper discharge motor M4 is turned off. Next, PLSCNT2 is reset to "0" in SS5-10-24, the solenoid SL1 is turned off in SS5-10-25, and the scale 120 is raised to prepare for the leading edge regulation of the document. Finally, the status S is set to "4" in 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 document is conveyed until the end of the scale 120 is regulated by the scale 120.
If PLSCNT2 reaches P16, SS
At 5-10-28, the main motor M3 is turned off and SS5-
At 10-29, set DSET to "1", return the pickup roller to the home position, and set SS5-10-3.
If it is 0, it is determined whether the front side of the document is set in the copy state or the back side of the document is set in the copy state. Here, if the original is set in the copy state on the front side, SS5
At -10-31, it is detected whether or not there is the next original in the original tray 61. If there is, the original counter D is set at SS5-10-32.
After setting CNT1 to “1”, SS5-10-33
To set the status K to "3" and feed the next original. If there is no status K, set the status K to "1" in SS5-10-34 and set the status S in SS5-10-35.
Is set to “5”. If it is determined in SS5-10-30 that the back side of the document is set in the copy state,
Without executing the processing of SS5-10-31 to 34,
The status S is set to "5" in SS5-10-35.

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

When the status S is "6", as shown in FIG. 124, the off edge of the paper discharge sensor SE3, that is, the trailing edge detection signal of the original is detected in SS5-10-49, and the off edge is detected and the trailing edge of the original is detected. When it is confirmed that the unit has passed the sensor SE3, the main motor M3 is turned off at SS5-10-50, and the solenoid S is turned off at SS5-10-51.
L1 is turned off and the scale 120 is raised. Next, SS
In 5-10-52, whether the paper discharge control counter H is "0" or not
That is, it is determined whether or not the discharge of the document is completed. When the discharge is completed, MODE is set to “0” in SS10-53, and
In SS5-10-54, the status S is set to "0" to set a 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 FIG. In the copying machine operation unit, reference numeral 100 denotes a copy start key;
Is a 10 key, 102 is a clear / stop key, 103 is a reset key, and 104 is a display unit. Reference numeral 105 denotes a document selection key, and reference numeral 105a denotes a thin paper mode display LED. When the thin paper mode is selected by the document selection key 105, the thin paper mode display section is turned on. 106 is a mode selection key, 106a
Is a two-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 display LEDs 106a, 106b, and 106c, respectively.

In the above 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 on.
If the ED 105a is on, the LED 105 is determined in S3-3.
Then, a is turned off and the document is set to a normal document copy state. If the state is off, the LED 105a is turned on in S3-4 to set the thin paper document to a copy state.

If the on-edge of the document selection key 105 is not detected in S3-1, the mode selection key 10 is pressed in S3-5.
6 is detected. If no on-edge is detected, other key input processing is executed in S3-8. On the other hand, if an on-edge is detected in S3-5, S
3-6, S3-9, and S3-11, respectively.
a, it is determined whether the LED 106b and the LED 106c are in the on state, and if the LED 106a is in the on state, L is determined in S3-7.
The ED 106a is turned off, the LED 106b is turned on, and the mode is set to the 2-in-1 mode.
In 3-10, the LED 106b is turned off, the LED 106c is turned on, and the count mode is set. If the LED 106c is on, the LED 106c is turned off in S3-12. If the LED 106c is off, 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 display on the display unit 104 in the copier operation unit.
In S4-1, it is determined whether or not the forgotten flag 1 is set to "1". If the forgotten flag 1 is set, in S4-2, the paper feed unit jam display 104 is displayed on the display unit 104.
Display a. Next, in S4-3, it is determined whether or not the forgotten flag 2 is set to "1". If the forgotten flag 2 is set to "1", the display unit 104 displays the paper discharge unit jam display 104b. Is displayed. If the forgetting flag 1 or 2 is set to “1”, the display unit 1
04 is notified of the removal of the jammed paper as illustrated. Further, in S4-5, other necessary displays are processed.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing an internal configuration of the ADF.

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

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

FIG. 5 is a cross-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 where the scale is lowered.

FIG. 7 is a side view showing a second embodiment of the scale pressing mechanism, showing a state in which 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 the scale pressing mechanism according to the second embodiment.

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

FIG. 11 is a side view of the scale pressing mechanism according to the second embodiment, showing a state where an operating solenoid 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 plunger of the solenoid 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 planar positional relationship between a scale tip, a notch of a film, and a separating 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 unit.

FIG. 18 is a perspective view showing a driving mechanism of a leading end regulating plate and a pressing plate in a document feeding unit.

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

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

FIG. 21 is an explanatory view showing a state in which the distal end regulating plate shown in FIG. 18 is in the non-regulating position and the pressing plate is in the pressing position.

FIG. 22 is a perspective view illustrating a driving mechanism of a registration roller and a conveyance belt.

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

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

FIG. 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 explanatory diagram of the operation of the paper passage opening / closing mechanism of FIG. 24;

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

FIG. 28 is a schematic explanatory view of a mechanism for supporting a cover of a document feeding unit.

FIG. 29 is an explanatory diagram of document conveyance by a stepping motor, showing a case where a document is stopped in a pulse control mode.

FIG. 30 is an explanatory diagram of document conveyance by a stepping motor, showing a case where a document is stopped in a scale mode.

FIG. 31 is an explanatory diagram of document conveyance in a pre-step mode.

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

FIG. 33 is an explanatory diagram of the document conveyance in the pre-step mode following FIG. 32;

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

FIG. 35 is an explanatory view of the document conveyance in the pre-step mode following FIG. 34;

FIG. 36 is an explanatory diagram of the document conveyance in the pre-step mode following FIG. 35;

FIG. 37 is an explanatory diagram of the document conveyance in the pre-step mode following FIG. 36;

FIG. 38 is an explanatory view of the document conveyance in the pre-step mode following FIG. 37;

FIG. 39 is an explanatory view of the document conveyance in the pre-step mode following FIG. 38;

FIG. 40 is an explanatory diagram of document conveyance in a 2-in-1 mode.

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

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

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

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

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

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

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

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

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

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

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

FIG. 52 is an explanatory diagram of document conveyance in a duplex mode.

FIG. 53 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 52;

FIG. 54 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 53;

FIG. 55 is an explanatory diagram of the document transport in the duplex mode following FIG. 54;

FIG. 56 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 55;

FIG. 57 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 56;

FIG. 58 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 57;

FIG. 59 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 58;

FIG. 60 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 59;

FIG. 61 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 60;

FIG. 62 is an explanatory diagram of the document conveyance in the duplex mode following FIG. 61;

FIG. 63 is an explanatory diagram of the document conveyance in the duplex 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 for controlling the copying machine main body.

FIG. 67 is a flowchart showing a subroutine of APS control in CPU1.

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

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 for controlling the ADF.

FIG. 72 is a flowchart showing a subroutine of an interrupt process in the CPU 2;

FIG. 73 is a flowchart showing an initialization 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 of a forget-to-take check in the CPU 2;

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

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

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

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

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

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

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

FIG. 84 is a flowchart showing a paper feed subroutine following FIG. 83;

FIG. 85 is a flowchart showing a sheet feeding subroutine following FIG. 84.

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

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

FIG. 88 is a flowchart showing a sheet feeding subroutine subsequent to FIG. 87.

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

FIG. 90 is a flowchart showing a sub-step of a pre-step set in CPU 2 subsequent to FIG. 89;

FIG. 91 is a flowchart showing a sub-step of a pre-step set in CPU 2 subsequent to FIG. 90;

FIG. 92 is a flowchart showing a pre-step set subroutine in the CPU 2 subsequent to FIG. 91;

FIG. 93 is a flowchart showing a sub-step of a pre-step set in CPU 2 subsequent to FIG. 92;

FIG. 94 is a flowchart showing a sub-step of a pre-step set in the CPU 2 subsequent to FIG. 93;

FIG. 95 is a flowchart showing a sub-step of a pre-step set in CPU 2 subsequent to FIG. 94;

FIG. 96 is a flowchart showing a sub-step of a pre-step set in CPU 2 subsequent to 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;

FIG. 100 shows 2-in-1 in CPU 2 following FIG. 99
9 is a flowchart showing a subroutine of a set.

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

FIG. 102 is a flowchart showing a 2-in-1 set subroutine in 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. 104 is a flowchart showing a 2-in-1 set subroutine in CPU 2 subsequent to FIG. 103;

FIG. 105 is a flowchart showing a 2-in-1 set subroutine in CPU 2 subsequent to FIG. 104;

106 is a flowchart showing a 2-in-1 set subroutine in CPU 2 subsequent to FIG. 105; FIG.

107 is a flowchart showing a subroutine of 2-in-1 set in CPU 2 subsequent to FIG. 106;

108 is a flowchart showing a 2-in-1 set subroutine in CPU 2 subsequent to FIG. 107;

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

FIG. 110 is a flowchart showing a paper discharge subroutine in CPU 2 subsequent to FIG. 108;

FIG. 111 is a flowchart showing a paper discharge subroutine in CPU 2 subsequent to FIG. 109;

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

113 is a flowchart showing a counting subroutine in CPU 2 subsequent to FIG. 112;

114 is a flowchart showing a counting subroutine in CPU 2 subsequent to FIG. 113.

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 CPU2.

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

FIG. 118 is a flowchart showing a duplex setting subroutine in the CPU 2;

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

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

FIG. 121 is a flowchart showing a double-sided setting subroutine in the CPU 2 subsequent to FIG. 120;

FIG. 122 is a flowchart showing a subroutine of double-sided setting in the CPU 2 subsequent to FIG. 121;

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

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

FIG. 125 is a flowchart showing a subroutine of input processing in CPU1.

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

FIG. 127 is a flowchart showing a subroutine of a display process in CPU1.

[Explanation of symbols]

1. Copier, 60: Automatic Document Feeder (ADF), 29
... platen glass, 120 ... scale.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-187142 (JP, A) JP-A-62-244032 (JP, A) JP-A-2-93446 (JP, A) JP-A 62-440 126056 (JP, A) JP-A-63-41336 (JP, A) JP-A-63-200546 (JP, U) JP-A-63-11438 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) G03G 15/00 107 G03B 27/58-27/64 B65H 9/00-9/20 B65H 5/06

Claims (1)

(57) [Claims] 1. A copying machine main body provided with a document positioning scale upstream or downstream of a document table glass in a document transport direction, and a document placed on a document feeder that covers the document table glass and is placed on a document feeder. An automatic document feeder that feeds the original upward, stops one end of the original against the scale, and sends the original from the original glass to the original discharge unit after exposure. A document reversing unit that reverses the sent document upside down and sends it back to the platen glass, and the length of the document in the document conveyance direction until the document that has passed through the scale passes through the document reversing unit and is conveyed on the scale again If the distance is longer than the distance, the scale is temporarily retracted below the upper surface of the platen glass just before the leading edge of the document passing through the document reversing section reaches the scale,
A copying machine provided with control means for raising the scale above the platen glass when the length of the document in the document transport direction is shorter than the distance.