JPH10218506A - Circulating document feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish proper measures of a circulating document feeder against erroneous operations of the user and erroneous detection of the size of documents, by providing the feeder with a durable, simplified sheet re-feed member. SOLUTION: A circulating document feeder includes a sheet re-feed lever 274 adapted to slide on a rail 272 arranged below a document tray 60 in parallel with the document feed direction,. The lever 274 projects through a slot formed in the document tray 60 above the tray so as to move from its home position below a sheet discharge port toward a sheet feed port. When a discharge sensor senses a document on the document tray 60 and a feed-sheet empty sensor does not sense a feed sheet, the lever 274 is moved by a predetermined distance depending on the document size. When the empty sensor sensors feed sheets, on the other hand, the lever 274 is stopped are returned to the home position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating document feeder provided with a one-sided reference document tray for connecting a paper feed port and a discharge port in the vicinity of a continuous surface. This relates to a refeed lever to be operated.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 6-148977 discloses a means for moving a document discharged from a paper feed port onto a document tray to a paper feed port in a conventional circulating document feeder.
An endless belt provided below a document tray is provided with a plurality of levers for regulating the leading edge of the discharged document when discharging the document and pressing the rear end of the document when returning the document. In Japanese Patent Application Laid-Open No. H6-148979, an endless belt exposed on the surface of a document tray and a movable frame movable in the document transport direction above the document tray are provided. It has been proposed to regulate the leading edge of a document, provide a regulating conveyance lever for pressing the upper end of the discharged document when returning the document, and convey the discharged document to the supply port by an endless belt while pressing the discharged document with the regulating conveyance lever. I have.

[0003]

However, the conventional means for moving an original to a paper feed port has a problem that the endless belt is used, so that it lacks durability and the apparatus becomes complicated. In addition, since the discharge port is generally located at the end of the apparatus, it is difficult for the user to take out the document. If the user mistakenly places the next document near the exit of the document tray while the refeed member is moving, not only the refeed member cannot return to the home position, but also the refeed member and the next document may be damaged. I do. Since the refeeding member moves only a predetermined amount according to the size of the original, if the apparatus erroneously detects the size of the original, the discharged original does not reach the paper feed port, and the sheet cannot be fed again. Despite the circulation mode is set, even if the user accidentally removes the original when the original has been ejected or while moving the original,
There have been many problems, such as the refeeding member being operated and idle feeding.

The present invention has been made in view of such a problem, and has a durable and simple structure refeeding member to appropriately cope with an erroneous operation by a user or an erroneous detection of a document size. It is an object to provide a document feeder.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a document tray for connecting a paper feed port and a discharge port in the vicinity of a continuous surface, and a document placed on the document tray. After feeding the paper one by one from the paper feed port and transporting it to the predetermined position,
In the circulating document feeder that discharges the document from the discharge port onto the document tray and, when all documents have been discharged, moves the discharged document from the discharge position to the paper feed port and re-feeds the document, the document is placed below the document tray. It is slidably provided on a rail provided parallel to the transport direction, protrudes above the document tray from the groove provided in the document tray, and can move toward the paper feed port from the home position located below the paper output port. A refeed lever provided, a discharge sensor for detecting the document discharged on the document tray, and a paper feed empty sensor for detecting the document moved to the paper feed port,
When the discharge sensor is turned on and the paper feeding empty sensor is turned off, the re-feeding lever is moved by a predetermined amount according to the size of the document, and stopped when the paper feeding empty sensor is turned on. It is characterized by returning to a position.

According to the circulating document feeder having the above configuration, the refeed lever is slid on the rail, so that the durability is good and the structure is simple. In addition, even if the circulation mode is selected, if the user erroneously removes the discharged document when the document is completely discharged, the discharge sensor is turned off, so the refeed lever does not operate, and unnecessary operation is avoided. You.

In the circulating document feeder, after all the documents have been discharged, the document is moved by a predetermined amount by the re-feed lever and moved to the center of the document tray. This makes it easier for the user to take out the discharged document.

In the circulating document feeder, when the discharge sensor is turned on while the document is being moved by the refeed lever or returning to the home position, the return operation of the refeed lever is stopped. As a result, even if the user mistakenly places the next document or obstacle on the document tray, the discharge sensor detects this and stops the return of the refeed lever. Object damage is prevented.

In the circulating document feeder, when the paper feed empty sensor is not turned on even when the refeed lever is moved by a predetermined amount depending on the document size,
Further, it is moved by a predetermined amount. This allows
Even if the apparatus erroneously detects the document size one size smaller, the document can be surely moved to the paper feed port, and the paper can be fed again.

In the circulating document feeder, even if the refeed lever is moved by a predetermined amount according to the size of the document, the paper feed empty sensor is not turned on, and the refeed lever is further moved by a predetermined amount. Also, when the sheet empty sensor is not turned on, the movement of the sheet re-feed lever is stopped. Thus, even if the user takes out the document while the refeed lever is being moved, the movement of the refeed lever is stopped, and unnecessary operation is avoided.

In the circulating document feeder, when the discharge sensor is turned off before the refeeding lever is moved, the movement of the refeeding member is prohibited. Thus, even if the circulation mode is selected, if the user erroneously removes the ejected document when the document ejection is completed, the ejection sensor is turned off, and the refeed lever does not operate, thus avoiding unnecessary operation. Is done.

[0012]

As is apparent from the above description, according to the present invention, a re-feeding member having good durability and a simple structure is provided. Has the effect of being able to deal with

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of a copying machine. This copying machine comprises a copying machine main body 1 and a document feeder (hereinafter, ADF) 2 according to the present invention.

<< Configuration and Operation of Copying Machine Body >>

First, the schematic configuration and operation of the copying machine will be described.

FIG. 1 shows the overall structure of a copying machine. A photosensitive drum 10 having a photosensitive layer on the outer periphery is fixed at a substantially central portion of the copying machine main body 1 indicated by a reference numeral in the direction of arrow a. It is installed so as to be rotatable at a peripheral speed v. Around the photosensitive 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 sheet separating charger 16, and a blade-type cleaner 17 are arranged along the rotation direction. Are located. An optical system 20 is arranged above the photosensitive drum 10.

The photoreceptor drum 10 rotates in the direction of the 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 immediately 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 arrow b at a speed of v / m (m: copy magnification) with respect to the peripheral speed v of the photosensitive drum 10 (constant irrespective of the same magnification and 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 feed unit 31 is transported by transport rollers 37b, 3
The sheet is sent out to the 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 the manual paper feeding port 40 is fed by paper feeding rollers 41.
To the timing roller 38. The sheet sent to the timing roller 38 once waits here, and is sent to the transfer section by turning on the timing roller 38 in synchronization with the image formed on the photosensitive drum 10. The sheet adheres to the photosensitive 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 photosensitive 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 conveyance roller 44 and the discharge roller 45. On the other hand, the photosensitive drum 10 continues to rotate in the direction of the arrow a even after the transfer, and 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 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 copying or composite copying, 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 in the counterclockwise direction. Transport 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 double-sided copy mode, the re-fed paper is sent out to the timing roller 38 while being guided upward by the switching claw 48 set at the solid line position, and is sent to the second surface (back surface). 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 by setting the switching claw 48 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 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. After that, the image is transferred onto the first surface (front surface), fixed, and discharged onto the discharge tray 46.

<< Configuration and Operation of ADF2 >>

Next, the configuration and operation of the ADF 2 will be described in detail.

The ADF 2 generally includes a document tray 60, a document feeder 80, a document feeder 120, a document discharger 140, a document regulator 170, a document movement prevention unit 240, and a document re-feed movement unit 270. Have been.

The ADF 2 is mounted on the upper surface of the copying machine main body 1 so that the original transport section 120 is positioned on the original glass 29 of the copying machine main body 1, and is mounted on the original mounting plate by a hinge fitting (not shown) provided on the back side. It can be opened to the upper surface of the glass 29.

Before describing the components of the ADF 2, the operation of transporting a document will be briefly described. When an operator manually sets a document on the document table glass 29, the ADF 2 is lifted upward to open the upper surface of the document table glass 29. A
Opening of the DF2 is performed by the magnet sensor SE10 shown in FIG.
0 and ADF2 is detected by this sensor SE100.
ADF only when it is detected that the
2 becomes possible.

The document feeder 80 feeds the documents placed on the document tray 60 from below, separates them one by one, and supplies them to the document feeder 120. The document feeder 120 is a document feeder 80
The original fed from the original platen glass 29 of the copying machine body 1
To a predetermined position on the screen. Here, the document scanned by the optical system 20 is discharged by the document discharge unit 140. The discharged document is stacked on the document tray 60 with its leading end regulated by the document regulation unit 170. When the original circulation mode is selected, when all originals have been ejected, the original is moved to the original feeder 80 by the original re-feeder 270,
Re-feeded.

Hereinafter, each part of the ADF 2 will be described.

(Document Tray)

As shown in FIG. 3, the document tray 60 has a continuous surface that connects the lower part of the paper feed port 61 and the lower part of the paper discharge port 62. This continuous surface extends from the paper feed port 61 to the paper discharge port 6
A second surface 64 for placing a paper document extending toward the paper supply port 61 from below the paper discharge port 62 and a first surface 63 for mounting a paper document extending toward the paper supply port 61. Consists of The first surface 63 is provided horizontally, and the second surface 64 is provided.
Are inclined upward toward the paper feed port 61 so that the leading end of the discharged document discharged from the paper discharge port 62 is placed above the rear end. The inclination angle α of the second surface 64 is 5 to 30 °, preferably 10 °. The first surface 63 and the second surface 64 are connected by a bent portion 65.

The leading end regulating plate 8 of the paper feed port 61 on the first surface 63
The length L1 from 1 to the bent portion 65 in the document transport direction is larger than half the length in the transport direction of the largest document that can be fed. Therefore, as shown in FIG. 3, the center of gravity G of not only the largest document placed on the first surface 63 but also a smaller document is located closer to the sheet feeding side than the bent portion 65. Therefore, when a document is set on the first surface 63, or when a discharged document is moved from the second surface 64 to the first surface 63 for refeeding and is set again, the discharge port 62 is set. Side, and the set original is prevented from being displaced toward the paper discharge port 62 due to mechanical vibration or the like during the paper feeding operation. In addition, even if the document is of a size such that the discharged document overlaps the fed document, the trailing end of the fed document faces downward with the bent portion 65 of the tray as a boundary.
The leading edge of the discharged document does not hit the trailing edge of the fed document,
Emission irregularities are prevented.

The bent portion 65 extends from the paper discharge port 62 on the second surface 64.
The length L2 in the document transport direction up to is larger than half the length in the transport direction of the minimum size document that can be fed. For this reason, as shown in FIG.
The center of gravity G of the document of the minimum size to be ejected is located on the ejection side of the bent portion 65. Therefore, the discharged document of the minimum size is not stacked beyond the bent portion 65, but slides down to the discharge port 62 side and is stacked with the rear end aligned.

The height H in the direction of gravity of the bent portion 65 of the document tray 60 up to the paper discharge port 62 is equal to, or preferably greater than, the height of the maximum loadable document. For this reason,
The height from the second surface 64 to the paper discharge port 62 becomes larger than the height of the maximum stackable amount of document as going from the bent portion 65 toward the paper discharge port 62 side. Therefore, as shown in FIG. 3B, even if the document discharged from the paper discharge port 62 curls upward and is placed on the second surface 64, the upper surface of the discharged document remains in the paper discharge port 62. It does not exceed and does not hinder the ejection of subsequent documents.

The first surface 63 of the document tray 60 is
As shown in FIG. 5, a first concave portion 66 extending in the document transport direction is formed, and a second concave portion 67 extending in a direction perpendicular to the transport direction is formed on the second surface 64. With these concave portions 66 and 67, a finger is inserted in the direction of the arrow at the bottom of a document placed on the document tray 60, for example, a discharged document,
The document can be easily taken out without damaging the document.

In the document tray 60, a sheet re-feeding lever 274 of a document re-feeding moving unit 270, which will be described later, is moved in the document conveying direction from the second surface 64 to the first surface 63.
One groove 68 is formed. Reference numerals 73 and 74 are guide grooves of the movable document regulating plate 70. The document tray 6
A fixed original regulating plate 69 serving as a reference for one side of the original conveyance is provided at an end on the back side of the document, and a movable original regulating plate 70 is provided at the front end so as to be movable in a direction perpendicular to the original conveying direction. Have been. As shown in FIG. 3, the fixed original regulating plate 69 has a discharged original stopper 1 of an original regulating portion 170 described later.
A plurality of openings 71 in which the protrusions 74 appear and one opening 72 in which a document pressing lever 246, which will be described later, appears and disappears are arranged in the document transport direction.

As shown in FIG. 4, the movable document regulating plate 70 is thicker or slightly inclined on the paper feeding side toward the fixed document regulating plate 69 on the reference side as compared with the paper discharging side in the document conveying direction. As a result, the interval W2 between the fixed original regulating plate 69 and the movable original regulating plate 70 on the paper discharge side in a direction perpendicular to the original conveying direction is wider than the interval W1 on the paper feeding side. . Therefore, even if the document discharged from the paper discharge port 62 is skewed or deviated from the reference,
Wide interval W between fixed document regulating plate 69 and movable document regulating plate 70
2 housed. Then, as the document is moved from the discharge side to the paper supply side for document circulation, the interval between the fixed document regulating plate 69 and the movable document regulating plate 70 becomes narrower, so that the document is perpendicular to the document conveying direction. And is aligned with the fixed original regulating plate 69.

The paper discharge side end of the movable document regulating plate 70 and the paper discharge port 6
2, a gap S is provided. Therefore, the discharged original can be taken out by putting a hand in the gap S. Further, since the gap S is formed smaller than the length of the minimum size document in the conveyance direction, even if the document discharged from the paper discharge port 62 is skewed or deviated from the reference,
The document does not fall out of the gap between the paper discharge side end of the movable document regulating plate 70 and the paper discharge port 62.

The first surface 63 and the second surface 64 of the document tray need not necessarily be flat.
As shown in (A), the concave portion 67 for taking out the original, the guide grooves 73 and 74, and the like as described above may be formed. Further, even if the convex portion 75 is formed on the second surface 64 as shown in FIG.
What is necessary is that the line connecting the top of the curve and the bent portion 65 is inclined. Similarly, as shown in FIG.
The convex portion 76 may also be formed on the substrate. Further, the first surface 63 is not necessarily horizontal, and may be inclined downward by β ° from the bent portion 65 toward the paper feed port 61 as shown in FIG.

(Original Document Feeding Unit)

As shown in FIG. 2, the original feeding section includes a leading end regulating plate 81, a refeed prevention member 82, a pickup roller 8
3 and a document pressing plate 84 and a separation roller 85 which can be pressed against the document 3
And a separation pad 86 and an intermediate conveyance roller 87 that are in pressure contact with the separation pad 86.
And a pinch roller 88 and a registration roller 8 which are in pressure contact with the roller.
9 and a pinch roller 90 that presses against it, a manual paper feed roller 91 and a pinch roller 92 that presses against it, and these are covered by a fixed cover 93a and a cover 93b that can be opened and closed. A guide 94 is provided along the pickup roller 83, the separating roller 85, the intermediate conveyance roller 87, and the registration roller 89, and the guide 94 forms a paper passing path. A manual paper feed path is formed by a manual paper feed roller 91 and a guide 95 arranged along the registration roller 89.

The leading end regulating plate 81 is provided so as to be rotatable about a support shaft 96, and the leading end can be protruded and retracted in a paper passing path slightly downstream of the pickup roller 83. The leading edge regulating plate 81 regulates the leading edge of the document set on the document tray 60. The sheet is retracted downward from when the first document is fed until the last document is fed.

As shown in FIG. 6, the re-feed prevention member 82 comprises a substantially L-shaped lever, and is provided between an operation position where the upper surface of the fed document is pressed around the support shaft 97 and an upper retreat position. It is provided so as to be rotatable between them. The position of the support shaft 97 serving as a fulcrum of the re-feed prevention member 82 is determined by the force F when the leading end of the discharged document entering the paper feed port 61 hits the re-feed prevention member 82. 82 is set so as not to retreat upward. The outer edge of the re-feed prevention member 82 is moved from the leading edge so that the discharged document hitting the outer edge when the re-feed prevention member 82 is in the operation position is guided to the upper surface of the lower fed document. It is formed in an arc shape inclined upward toward the upstream side in the transport direction.

A claw portion 99 is provided at the tip of the refeed prevention member 82 by forming a V-shaped notch 98. The evacuation locus about the support shaft 97 at the tip of the claw portion 99 is located inside the outer edge shape of the re-feed prevention member 82, as shown by the one-dot chain line in FIG. Refeed prevention member 8
The angle γ of the upper edge of the second claw portion 99 in the document transport direction with respect to the fed document is 90 ° or less, preferably 80 °.

The refeed prevention member 82 is provided in the original tray 6.
When a document is set to 0, it is located at the upper retreat position. When the feeding of the fed document is started, the refeed preventing member 82 rotates to the operating position, and the claw portion 99 at the tip thereof comes into pressure contact with the upper surface of the fed document. When the lowermost document of the fed document is fed and subjected to copy processing, and discharged from the discharge port 62,
The discharged original is placed on the original tray 60.

When the document size is large, the leading end of the discharged document may enter the paper feed port 61 as shown in FIG. In this case, the leading end of the discharged document hits the outer edge of the re-feed prevention member 82, is guided downward, and is placed on the fed document.

Even if the leading edge of the discharged document hits the outer edge of the refeed preventing member 82 and the force F acts, the refeed preventing member 82 does not retreat upward. For this reason, the discharged document does not slip through the refeed prevention member 82 as the fed document is fed, and refeeding is reliably prevented. The angle γ of the claw 99 of the re-feed prevention member 82 when the last fed document that comes into contact with the claw 99 at the tip of the re-feed prevention member 82 is fed.
Is 90 ° or less as described above, which is more preferable in that the discharged document hardly slips through the nail portion 99.

When all of the fed originals have been fed, the refeed prevention member 82 rotates to the upper retracted position. At this time, since the claw portion 99 of the sheet re-feed prevention member 82 is retracted without being caught by the discharged document, the rear end of the discharged document is not damaged. As shown in FIG. 7, the claw portion 99 of the re-feed prevention member 82 is made of an elastic material, preferably a rubber material, in order to reliably prevent damage to the upper surface of the fed document and the leading end of the discharged document. It may be formed and attached to the tip of the refeed prevention member 82.

The pickup roller 83 is provided so as to be rotatable clockwise in FIG. As shown in FIG. 9, three pickup rollers 83 are provided side by side in a direction perpendicular to the document conveying direction.

The original pressing plate 84 is disposed above the three pickup rollers 83 so as to face each other.
Thereby, it can be moved up and down between a pressing position and an upper evacuation position. An elongated spring support plate 10 extending in the axial direction of the pickup roller 83 is provided above the original pressing plate 84.
1 is provided. Two coil springs 102 are interposed between the spring support plate 101 and each document pressing plate 84, respectively, and a sheet feeding pressure is applied to the document placed on the pickup roller 83 by the coil springs 102. It has become so. The feed pressure to the fed document is variable by a feed pressure variable mechanism 103 described later.

As shown in FIG. 9, the variable feed pressure mechanism 103 includes a drive motor 105 having a worm 104 mounted on a drive shaft, a worm wheel 106 screwed to the worm 104 of the drive motor 105, and a gear 107. A transmission shaft 108, a cam shaft 111 including a gear 110 and a cam 110 screwed to a gear 107 of the transmission shaft 108, and a driving lever 112 contacting the cam 110 of the cam shaft 111 and contacting the spring support plate 101. And a lever shaft 114 provided with a pressing lever 113 to be pressed. A notched circular detection plate 115 is attached to the cam shaft 111 so that the position of the cam 110 can be detected by a sensor (not shown).

When the original is set on the original tray 60, the lever 100 rotates upward against the urging force of the coil spring 102, as shown in FIG. Is located at the evacuation position.
As shown in FIG. 10A, when the original is set and the first sheet of original is fed, the lever 100 rotates downward and the original pressing plate 84 moves to the lower pressing position. The feeding pressure is applied to the upper surface of the fed document by the urging force of the coil spring 102. As a result, the fed document is fed one by one from the lowermost one.

As the fed document is fed one by one and its height is reduced, the coil spring 102 is extended and the feeding pressure is reduced. For this reason, if the height of the fed document decreases by more than a certain height, the feeding pressure may be insufficient. Also, as shown in FIG. 8, when the size of the discharged document is large and the discharged document overlaps and is discharged, the height of the fed document is reduced and the feeding pressure is reduced. In addition, since the weight of the discharged document is added to the rear end of the fed document, the feeding pressure is further insufficient.

Therefore, when there is a concern that the feeding pressure of the fed document may be insufficient, the feeding pressure variable mechanism 1 may be used.
03 increases the paper feed pressure. There are two ways to do this. First, the number of fed documents is counted, and when a predetermined number of documents are fed, the feeding pressure is increased as shown in Table 1. Second, the height of the fed document is detected, and when the amount of reduction in height due to paper feeding is equal to or greater than a predetermined value, the feeding pressure is increased as shown in Table 2.

[0056]

[Table 1] Document size Count B4 / Legal 20th A3 / W Letter 15th

[0057]

[Table 2] Document size Height reduction B4 / Legal 3mm A3 / W Letter 2mm

In order to increase the feeding pressure of the fed document, the driving motor 105 of the feeding pressure variable mechanism 103 shown in FIG. 9 is driven by a fixed amount. Thereby, the transmission shaft 108 and the camshaft 11
1 rotates, the driving lever 112 is pressed by the cam 110 of the cam shaft 111, and the lever shaft 114 rotates. As a result, the pressing lever 113 rotates to press the spring support plate 101. Thereby, as shown in FIG. 10A, the spring support plate 101 moves downward by a predetermined dimension, and the length of the coil spring 102 changes from Ls1 to Ls2. As a result, the urging force of the coil spring 102 increases,
Pressure between the pickup roller 83 and the fed document (feed pressure)
Increase. With this configuration, the paper feed pressure decreases due to the extension of the coil spring when the discharged document increases due to the configuration in which the paper feed pressure is not varied, and the difference between the fed document and the discharged document at the rear end of the fed document Slip of the fed document by the pickup roller 83 due to the increase in the pressing force is eliminated, and the frictional force between the fed roller and the fed document becomes larger than the frictional force between the trailing end of the fed document and the document tray.

The separating roller 85 is provided so as to be rotatable clockwise in FIG. As shown in FIG. 12, two separating rollers 85 are provided in a direction perpendicular to the document conveying direction. The separation pad 86 is provided in the above-mentioned 2
It is arranged so as to come into pressure contact with the two separating rollers 85 from substantially above, and separates and conveys the fed document fed from the pickup roller 83 one by one. Note that, instead of the combination of the separating roller 85 and the separating pad 86, a known torque limiter type separating unit or a reverse separating unit may be used.

The intermediate conveying roller 87 is provided with the separating roller 8.
It is arranged in the middle of the paper passing path between the registration roller 5 and a registration roller 85 described later, and is provided so as to be rotatable clockwise in FIG. This intermediate transport roller 87 is provided in
As shown in FIG. 2, two are provided in a direction perpendicular to the document conveying direction.

The registration roller 89 is connected to the original conveying section 120.
And is provided so as to be rotatable clockwise in FIG. This registration roller 89
Are provided side by side in the direction perpendicular to the document transport direction, as shown in FIG.

The document transport speed of the intermediate transport roller 87 is set faster than the separating roller 85, and the document transport speed of the registration roller 89 is set faster than the intermediate transport roller 87.
The documents separated by the separation roller 85 and separated one by one are conveyed by the intermediate conveyance roller 87 and engaged with the nip portion of the registration roller 89. At this time, although the registration roller 89 is stopped, the separation roller 85 and the intermediate conveyance roller 87 are driven for a certain period of time and then stopped, so that the fed document is separated from the intermediate conveyance roller 87 as shown by a two-dot chain line in FIG. A loop 116 is formed between the registration rollers 89. And
After a certain period of time from this state, the intermediate transport roller 87 and the registration roller 89 are driven simultaneously, and the fed document is transported to the entrance of the document transport unit 120.

The arrangement of the separating roller 85, the intermediate conveying roller 87, and the registration roller 89 will now be described. As shown in FIG. 12, the outermost width of the two intermediate conveyance rollers 87, that is, the interval Wm between both ends is 2
Outermost width of each separating roller 85, that is, the distance W between both ends
s. The line of action of the resultant force f of the friction forces f1 and f2 generated by the two separating rollers 85 and the line of action of the resultant force T of the transport forces T1 and T2 generated by the two intermediate transport rollers 87 are the same along the paper passing path. On the line. The separating roller 85, the intermediate conveyance roller 87, and the registration roller 89 are arranged symmetrically with respect to a line C parallel to the sheet passing direction. With such an arrangement, the separation roller 8
When the document is conveyed from 5 to the intermediate conveyance roller 87, the document is not obliquely fed without generating couple. Further, the intermediate transport roller 87 shortens the transport time from the separating roller 85 to the registration roller 89, and improves the productivity of transporting the paper.

As shown in FIG. 13, the shortest paper passage path length from the intermediate conveyance roller 87 to the registration roller 89 is L1, and the length of the document conveyed by the intermediate conveyance roller 87 and the shortest paper passage path length L1. The difference, that is, the length of the loop portion 116 of the document conveyed by the intermediate conveyance roller 87 for a certain period of time after the leading edge of the document is locked in the nip portion of the registration roller 89 is L2 (in FIG. Part 116
Is extended downstream of the registration roller 89. ), The length of the longest paper size in the paper transport direction at the maximum paper width from the paper passing reference to the outermost contour of the registration roller 89 is L3, the speed of the intermediate transport roller 87 is V1,
When the speed of the registration roller 89 is V2,

[0065]

(L3-L1-L2) / V1 ≦ L2 / (V
2-V1)

Has the following relationship: Due to this relationship, when the intermediate conveyance roller 87 and the registration roller 89 are driven after the formation of the loop portion 116, the loop portion 116 decreases due to a speed difference between the two, but the rear end of the document passes through the intermediate conveyance roller 87. The loop portion 116 remains until this. For this reason, even if the document is obliquely fed through the separation roller 85 and the intermediate conveyance roller 87, the state is resolved by the loop unit 116 and the registration roller 8
9 is transported in a normal state.

In addition, the width of one intermediate conveyance roller 87 is set smaller than the width of the separation roller 85 on the upstream side, and is located inside the width of the separation roller 85. For this reason, the sheet separated and separated by each of the two separation rollers 85 is conveyed by the intermediate conveyance roller 87 on the downstream side, and for example, the frictional force f1 of the separation roller 85 and the conveyance force of the intermediate conveyance roller 87 The influence of T1 on the paper is small, and the occurrence of paper wrinkles is prevented.

The length to the outermost edge of the separating roller 85 farthest from the sheet passing reference is set to be shorter than the width of the minimum allowable paper (short side of A5 paper). Feeding is prevented.

(Document Conveying Section)

As shown in FIG. 2, the document feeder 120
A drive roller 121 disposed near the document feeder 80,
Driven roller 12 disposed in the vicinity of document discharge section 140
2, and an endless transport belt 123 wrapped around a drive roller 121 and a driven roller 122, which are covered with the document tray 60. The transport belt 123 is
The size of the document table glass 29 covers the entire surface. A number of backup rollers 12 are provided inside the transport belt 123 to press the transport belt 13 against the platen glass 29.
4 is installed rotatably.

The conveyor belt 123 is driven to rotate clockwise in FIG. 2 to convey the original on the platen glass 29, and is provided on the copying machine main body 1 so as to approach the end of the original platen glass 29. When the leading edge of the document comes into contact with the scale 125, the conveyance is stopped.

The scale 125 is attached to the platen glass 29.
It has a function to stop the leading edge of the document conveyed above at the exposure reference position, and instructs the leading edge of the document to match the exposure reference position when lifting the ADF 2 and manually placing the document on the platen glass 29. It has a function to do.

As shown in FIG. 14A, this scale 125 is rotatable about a pin 127 as a fulcrum on a holder 126 provided on the rear side and the front side on the upper frame of the copying machine main body 1, and The spring 128 is attached with its tip urged upward. The lower surface of the leading end of the scale 125 is provided with a projection 129 which is engaged with the lower surface of the document table glass 29. As a result, the upper surface of the leading end of the scale 125 protrudes from the document table glass 29 by a predetermined height. The scale 125 is retracted downward from the upper surface of the platen glass 29 by the scale pressing mechanism 130.

The scale pressing mechanism 130 includes a movable base plate 131, a solenoid 132, and a lever 133. The movable base plate 131 is a substantially rectangular plate, and one of two opposing corners is a document discharge unit 140.
Is attached to the inner frame 134 so as to be rotatable in the vertical direction about a support shaft 135, and the other corner portion has a regulating protrusion 136 facing the upper end of the holder 126 of the scale 125.
Are formed. The movable base plate 131 includes a spring 13
7, the regulating protrusion 136 is urged in a direction toward the holder 126 of the scale 125. Solenoid 1
32 is a movable base plate 1 such that the plunger faces downward.
31. The lever 133 is rotatably attached to the movable base plate 131 by a support shaft 138, and one end is connected to a plunger of the solenoid 132.
The other end is provided with a projection 139 for pressing the scale 125.

In the scale retracting mechanism 130, the solenoid 132 is normally off, the plunger protrudes downward, and the lever 133 does not press the scale 125. When the scanning operation of the document stopped at the exposure reference position on the platen glass 29 is completed, the solenoid 132 is switched from the off state to the on state, and the lever 133 is rotated clockwise in FIG. Presses the scale 125. At this time,
The spring 137 urges the movable base plate 131 not to rotate due to the urging force of the spring 128 of the scale 125, and urges the lever 133 to a weaker force than the solenoid 132 pushes the scale 125 further down when the scale 125 reaches the retracted position. Have been. Thereby, the lever 13
3 and the scale 125 are prevented from being broken. As a result, as shown by a two-dot chain line in FIG.
28 is pushed downward against the urging force of the document 28, and the upper surface of the leading end thereof is retracted downward from the upper surface of the document table glass 29. It is transported to 140.

Conventionally, the scale pressing mechanism is mounted on the ADF, while the scale is mounted on the copying machine body. Therefore, in the conventional copying machine, the amount of pressing of the scale is reduced depending on the variation in the mounting of the scale pressing mechanism to the ADF, particularly, the mounting accuracy at the hinge portion of the ADF, and the scale cannot be reliably retracted. there were. However, the scale pressing mechanism 130 of the present invention allows the ADF 2 to be mounted on the platen glass 29 even if the mounting position accuracy of the scale pressing mechanism 130 to the ADF 2 and the mounting accuracy of the ADF 2 to the copying machine main body 1 vary.
Is set, the regulating protrusion 136 of the movable base plate 131 is set.
Comes into contact with the upper end of the holder 126 of the scale 125, and the movable base plate 131 rotates.
The dimension A from the support shaft 138 of the zero lever 133 to the upper end of the holder 126 of the scale 125 is regulated to a constant value.
As a result, the pressing amount of the scale 125 is kept constant,
The scale 125 can be reliably retracted.
Further, with such a configuration, it is possible to make the solenoid 132 unadjustable, and the solenoid 132 itself does not have to expect the torque for the mounting variation, so that the required power is reduced and the size can be reduced.

A description will be given of the document exchange in the document transport section 120. In the document transport unit 120, when the scanning of the document transported to the exposure reference position ends, the document is replaced. In other words, the scanned original is transported to the original discharge unit 140, and the next original is transported to the exposure reference position. In order to improve the productivity of the copying process of the copying machine, the document exchange is started at the same time as the scanning of the document is completed, and the scanner starts returning after braking.

In a high-speed machine, document exchange, scanning,
High speed is required for all returns, and the current consumption when driving the motor is inevitably increased. Since the time required for the brake varies depending on the copy magnification, the return start timing varies depending on the magnification.
The peaks of the current consumptions of the DF2 and the scanner may overlap. As a result, it is conceivable that the current consumption exceeds the standard and exceeds the power supply capacity, and the power supply drops during use. To cope with this, it is sufficient to increase the power supply capacity, but this increases the cost.

Therefore, in this embodiment, the timing at which the peak of the current consumption at the start of document replacement of the ADF 2 and the peak of the current consumption at the start of the return of the scanner occur, and the brake time of the scanner based on the copy magnification,
At the copy magnification where the peak current generation timings overlap,
By delaying the document exchange start timing of the ADF 2 by a predetermined time, the current consumption of the system can be kept within the standard,
The copying process can be continued comfortably.

(Original Document Discharge Unit)

As shown in FIG. 2, the document discharge section 140
A reversing roller 141, pinch rollers 142 and 143 pressed against the reversing roller 141, a switching claw 144 provided near the reversing roller 141, and a discharge roller 145;
A pinch roller 146 is provided for pressing against the discharge roller 145, and these are covered with a cover 147 that can be opened and closed.
A guide 148 is provided from an exit of the document feeder 120 to a discharge roller 145 through a portion where the reversing roller 141 and the pinch roller 142 face each other. A paper passing path is formed by the guides 148. Further, a guide 149 is provided from the switching claw 144 to the exit of the document conveying unit 120 through the facing portion of the reversing roller 141 and the pinch roller 143, and the guide 149 forms a reversing path.

As shown in FIG. 15A, the original transporting section 1
A document that passes through a paper passage path from 20 to the reversing roller 141 is transported by the transport force of the document transport unit 120. In this paper passing path, especially when a stiff original such as a thick paper comes into contact with the inner guide 148, the resistance is increased to cause an original slip, and the original is not discharged. Document transport unit 12
Increasing the conveyance force of 0 is not preferable because it increases the torque and also causes the original to wrinkle when the original is stopped against the scale 125. Therefore, in order to enable the document to be transported without increasing the transport force of the document transport unit 120, a paper passing path from the document transport unit 120 to the reversing roller 141 is formed as shown in FIG. The shape of the inner guide 148 is set so as to be inside the natural bending curve of the original having the maximum thickness that allows paper to pass between the exit of the original transport unit 120 and the nip between the reversing roller 141 and the pinch roller 142. Form. By doing so, the slip of the thick paper document is prevented, and the document transport unit 1
The document can be reliably discharged without increasing the conveyance force of the document 20.

The reversing roller 141 can be driven to rotate clockwise in FIG. The switching claw 144 normally rotates counterclockwise in FIG. 2 and guides the document to an upper paper passing path. In the double-sided mode, the switching claw 144 rotates clockwise from the state shown in FIG. 2 by a predetermined angle, guides the document to the reverse path, and returns the document to the document transport path.

The discharge roller 145 can be driven to rotate clockwise in FIG. 17, the first, second, third, and fourth discharge rollers 145 fixed to one rotating shaft 150 are provided.
a, 145b, 145c, and 145d. These discharge rollers 145 are set at intervals so as to be able to discharge originals of all sizes that can be passed.

The discharge roller 145 has a document urging mechanism 151 for urging the original in a direction perpendicular to the surface thereof in order to impart a curl extending in the original conveying direction to the discharged original. The document urging mechanism 151 includes a document urging roller 152 and a document urging rib 153.

The document urging roller 152 is connected to the discharge roller 14.
5 is fixed to the rotating shaft 150. The document urging roller 152 includes first and second discharge rollers 145a and 145.
b, a second document urging roller 152b positioned between the second and third discharge rollers 145b and 145c, and a third and fourth discharge roller 145c positioned between the second and third discharge rollers 145b and 145c. 145d between the fourth discharge roller 145
and a third document urging roller 152c located in the vicinity of d. The diameter of these document urging rollers 152 is larger than the diameter of the discharge roller 145, and half of the diameter difference is the upward urging amount (δ1) with respect to the document.

As shown in FIG. 16, the document urging rib 153 extends downward at the edge of a guide 148 that forms a paper passing path. As shown in FIG. 17, the document urging rib 153 includes a first document urging rib 153a located on the paper passing reference side of the first discharge roller 145a and a third discharge roller 1
The second document urging rib 153b is located on the side opposite to the paper passing reference side of the sheet 45c, and the third document urging rib 153c is located on the side opposite to the paper passing reference side of the fourth discharge roller 145d. . The distance S1 between the first document urging rib 153a and the first discharge roller 145a is equal to the distance between the first discharge roller 145a and the second discharge roller 145a.
It is smaller than the distance W1 to the discharge roller 145b. Further, the second document urging rib 153b and the third discharge roller 145
The distance S2 of c is smaller than the distance W2 between the second discharge roller 145b and the third discharge roller 145c. Distance S3 between third document urging rib 153c and fourth discharge roller 145d
Are the third discharge roller 145c and the fourth discharge roller 145d
Is smaller than W3. These document urging ribs 1
Numeral 53 denotes a downwardly biasing amount (δ2) with respect to the document, in which the projecting dimension of the four discharge rollers 145 from the conveying surface is downward.

When an A4 size document shown in FIG. 17, for example, passes through the discharge roller 145 provided with the document urging mechanism 151, the first and second document urging rollers 152a and 152 are provided.
The document is urged upward by b, and two upward curls are formed at the center of the document. The first and second document urging ribs 153a and 153b form curls having higher rigidity at both ends of the discharged document than at the center. If the document is an A5 size document, the first document urging rib 153a and the second
The document urging roller 152b forms curls on both sides of the document. If the document is a B4 size document, the third
A strong curl is formed by the document urging roller 152c. As described above, as a result of the formation of the stiff curl at both ends, the discharged document is discharged while maintaining the curl shape, and the rigidity is not lost until the discharged document is separated from the discharge roller 145. For this reason, the discharged documents do not warp at the leading end, and are stacked on the document tray 60 without sending out or fluttering the discharged documents.

FIG. 18 shows a document urging mechanism 154 capable of adjusting the urging amount. The document urging mechanism 154 includes the guide 1
48, a solenoid 155 and a support shaft 156.
And a lever 157 rotatably attached to the guide 148. One end of the lever 157 is attached to a plunger of the solenoid 155, and a document urging projection 158 is formed at the other end. When the discharged document has the normal paper quality, the solenoid 155 is turned off, and a constant urging amount (δ1) is given to the document. If the discharged original is relatively hard, such as Kent paper, the solenoid 1
The lever 55 is turned on, the lever 157 rotates clockwise in FIG. 18, and a larger urging amount (δ1 + α) is given to the document than in the normal case. In this manner, curl can be formed by applying an optimal bias amount according to the type of the document.

FIG. 19 shows another embodiment in which a document is curled. The curl applying mechanism 159 includes a plurality of discharge rollers 160 having a truncated cone shape, and these discharge rollers 1.
And a pinch roller 161 which is in pressure contact with the outer peripheral surface of the roller 60. According to the curl applying mechanism 159, curl can be applied without urging the document. The curl applying mechanism 159 and the document urging mechanisms 151 and 154
Needless to say, it can be combined with.

(Original Document Control Section)

The document regulating section 170 regulates the leading edge of the document ejected from the document ejection section 140. As shown in FIG. 20, a plurality of ejected document stopper mechanisms 171 and the ejected document stopper mechanisms 171 are provided. Drive mechanism 17 for driving
It consists of two.

A plurality (nine) of the discharged document stopper mechanisms 171 are provided inside the fixed document regulating plate 69 according to the document size in the document conveying direction. That is, the size (Lma) having the longest length in the document conveying direction
x), the position of the dimension (Lmax + α) farthest from the upstream end of the document tray 60 in the document discharge direction,
For a document of the size (Lmin) having the shortest length in the document conveying direction, the document is provided at a position (Lmin + α) closest to the upstream end of the document tray 60 in the document discharging direction. For originals having almost the same length in the original transporting direction, by using the same discharged original stopper mechanism 171, the configuration can be simplified and the cost can be reduced. The six discharged document stopper mechanisms 171a on the downstream side in the document discharging direction and the three discharged document stopper mechanisms 171b on the upstream side are slightly different in shape. Hereinafter, the former is referred to as an A-type discharge original stopper mechanism 171a, and the latter is referred to as a B-type discharge original stopper mechanism 171b.

FIG. 21 shows an A type discharge original stopper mechanism 171a. This ejected document stopper mechanism 17
1a is accommodated in a holder 173 attached inside the fixed original regulating plate 69, and includes a stopper 174 and a lever 17a.
It consists of five.

The stopper 174 is connected to the first arm 176
And the second arm portion 177 form an inverted L-shape, and one end of the first arm 176 is attached to the lower end of the holder 173 by a support shaft 178, and between a retracted position shown by a solid line and a regulation position shown by a two-dot chain line. It is rotatable. The stopper 174 is urged in the counterclockwise direction in the figure by a spring (not shown) so that the second arm portion 177 projects from a rectangular opening 71 formed in the fixed document regulating plate 69, and the document tray The upper surface 60 is in contact with the upper surface. The outer edge of the second arm 177 is formed in an arc shape centering on the support shaft 178.

The lever 175 has a first lever 180 one end of which is rotatably attached to the upper end of the holder 173 by a support shaft 179, and a support shaft 182 at the tip of the first lever 180.
And a second lever 181 that is rotatably attached to the second lever 181. The first lever 180 is urged counterclockwise in the figure around the support shaft 179 by a spring (not shown). The second lever 181 rotates counterclockwise around the support shaft 182 but does not rotate clockwise so that the second lever 181 engages with the engagement portion 183 of the first lever 180. 184. Second lever 18
The first arm portion 17 of the stopper 174
6 is provided with a columnar projection 185 which is in pressure contact with the inner edge of the inner projection 6.

In the discharged document stopper mechanism 171,
The biasing force of the lever 175 in the counterclockwise direction about the support shaft 179 is set to be larger than the biasing force of the stopper 174 in the counterclockwise direction about the support shaft 178.
For this reason, as shown in FIG. 21A, when the lever 175 is not pressed by the drive pin 196 of the drive mechanism 172 described later, the protrusion 185 of the lever 175 presses the stopper 174 in the direction of the arrow, resulting in the stopper 174.
Is located at a retracted position retracted inside the document regulating plate 69. Further, as shown in FIG. 21B, when the lever 175 is pressed by the drive pin 196, the lever 175 rotates clockwise about the support shaft 179, and the protrusion 185 of the lever 175 is moved to the inner edge of the stopper 174. Following this, the stopper 174 rotates counterclockwise about the support shaft 178 by its own urging force.
As a result, the stopper 174 has its second arm 17
7 protrudes from the opening 71 of the fixed document regulating plate 69, presses against the document tray 60, and stops at the regulating position. Further, when the lever 175 is pressed by the drive pin 196, the projection 185 of the lever 175 separates from the inner edge of the stopper 174 and contacts the holder 173 as shown in FIG. As a result, the engaging portion 183 of the first lever 180 and the engaging portion 184 of the second lever 181 are separated from each other and are bent. Therefore, even if the drive stroke of the drive pin 196 is large, the lever 175 does not break.

FIG. 22 shows a B-type ejected document stopper mechanism 171b. Since the shape of the ejected document stopper mechanism 171a is the same as that of the A-type ejected document stopper mechanism 171a except for the shape of the stopper 186, the corresponding parts are denoted by the same reference numerals. The description is omitted. The shape of the stopper 186 is the second arm 1
The outer edge of 87 is formed by two straight edges 188,189. When the stopper 186 is at the regulation position, the first linear edge 188 on the distal end side is perpendicular to the document tray 60, and the second linear edge 189 is inclined with respect to the document tray 60.

As shown in FIG. 23, the drive mechanism 172 of the discharge original stopper mechanism 171 is
, A first slider 191, and the first slider 191
, A second drive mechanism 194 that slides the second slider 193 and a first drive mechanism 192 that slides the second slide mechanism 193.

The fixed frame 190 is fixed to the fixed original regulating plate 6.
9, each of the ejected document stopper mechanisms 1
The drive pin holding unit 1 is located at a position facing the lever 175
95. This drive pin holding section 195 is
A drive pin 196 is slidably held so as to advance and retreat with respect to the lever 175 of the discharge original stopper mechanism 171.

The first slider 191 is, as shown in FIG. 24, a second slider holder 19 extending in the document conveying direction.
7 and a drive section 198 extending from a substantially center of the second slider holding section 197 in a direction perpendicular to the document conveying direction. The distal end of the driving section 198 is bent downward to form a driving surface 199 to which a cam 210 of a first driving mechanism 192 described below is pressed. The drive unit 198 has an elongated hole 200 extending in a direction perpendicular to the document transport direction. By inserting a screw 201 into the elongated hole 200 and screwing it into the fixed frame 190, the first slider 1
Reference numeral 91 is attached to the fixed frame 190. The first slider 191 is guided by guides 202 formed on the fixed frame 190 on both side edges of the drive unit 198, and is slidable in a direction perpendicular to the document conveying direction. Further, as shown in FIG. 23, the first slider 191 is urged rearward by a spring 203 mounted between both ends of the driving surface 199 and the fixed frame 190.

As shown in FIG. 23, the first drive mechanism 192 has a drive motor 205 having a worm 204 mounted on a drive shaft, and a connection having a worm wheel 206 and a gear 207 screwed to the worm 204 of the drive motor 205. Two camshafts 211 having a shaft 208 and a gear 209 and a cam 210 meshing with the gear 207 of the connecting shaft 208
Consists of When the drive motor 205 rotates, the camshaft 211 rotates via the connection shaft 208, and the first
The slider 191 slides back and forth in a direction perpendicular to the document transport direction.

As shown in FIG. 24, the second slider 193 includes a base 212 extending in the document conveying direction,
A plurality (two in the present embodiment, but not limited to, nine) protruding downward from the side edge bent downward of the second 2.
And a pressing portion 213. At both ends of the base 212, elongated holes 214 are formed.
The second slider 193 is slidable in the document conveying direction with respect to the first slider 191 by inserting the 15 and screwing it into the first slider 191. The plurality of pressing portions 213 are located at predetermined intervals in the document transport direction. The slot 200 and the screw 201 forming the slide shaft of the first slider 191 are connected to the symmetric axis 21 of the two cam shafts 211 of the first drive mechanism 192.
6 is preferred. By doing this,
The pressing portion 213 farthest from the slide shaft is a driving pin 196.
When the stopper 174 is pressed through the first slider 191, the first slider 191 does not pry and operates smoothly.

As shown in FIG. 23, the second drive mechanism 194 has a gear 217 mounted on a drive shaft and a drive motor 21.
8, a pinion 219 that meshes with the gear 217 of the drive motor 218, and a rack 220 that is attached to the lower surface of the base 212 of the second slider 193 so as to extend in the document conveying direction and meshes with the pinion 219. When the drive motor 218 rotates, the rack 220 moves via the gear 217 and the pinion 219, and the rack 220 moves.
Along with 20, the second slider 193 moves in the document conveying direction.

FIG. 25 shows the positional relationship between the pressing portion 213 of the second slider 193 and the driving pin 196. When the second slider 193 is at the home position, the pressing portion 213 surrounded by a circle at the most downstream side in the document transport direction faces the drive pin 196 at the most downstream side in the transport direction. 2nd slider 1
Any one of the pressing portions 213 surrounded by a circle every time the 93 moves from the home position to the upstream side in the document conveying direction by a predetermined distance.
Faces one of the drive pins 196, and each time it moves from the home position to the downstream side in the document conveying direction by a predetermined distance, any one pressing portion 213 surrounded by a circle faces any one of the drive pins 196. It has become. As described above, since the second slider 193 has the plurality of pressing portions 213, the moving distance is shortest, and any one of the pressing portions 213 can be quickly opposed to the desired drive pin 196.

In the document regulating section 170 having the above-described configuration, 1
When the first document is fed and ejected, the ejected document stopper mechanism 17 according to the document size input by the user or the document size detected when the first document is fed.
1 is selected. Then, the second slider 193 is moved by the second drive mechanism 194, and any of the pressing portions 2
13 faces a drive pin 196 corresponding to the selected ejected document stopper mechanism 171. Next, the rotation of the cam 210 of the first drive mechanism 192 causes the first slider 19 to rotate.
1 slides in a direction perpendicular to the document conveying direction, and its pressing portion 213 is
The drive pin 196 corresponding to 71 is pressed. As a result,
The lever 175 of the ejected document stopper mechanism 171 is rotated by being pressed by the drive pin 196, and the stopper 174 is pivoted from the retracted position to the regulating position. When the value is large, the sheet is pressed against the fed document placed on the document tray 60. As a result, the leading edge of the discharged document hits the stopper 174 on the discharge trajectory, and is pulled down and aligned as it is.

When a document of a size larger than the first sheet is mixed, the document regulating unit 170 moves the stopper 174 from the regulating position in order to prevent the document from hitting the stopper 174 during ejection and being damaged. It is preferable to return to the retracted position. Then, at this time, the stopper 174 corresponding to the document of the different size is operated from the retracted position to the restricted position. Further, when the stopper 174 cannot be retracted due to a failure of the sensor or the motor, the stopper 174 remains on the document tray 60, and there is a possibility that the next document cannot be set or the discharged document may be caught and damage the document. It is preferable to prohibit the use of the document feeder.

Another form of the document regulating section 170 will be described.

FIG. 26 shows the discharge original stopper mechanism 1.
7 shows another type of driving mechanism 221 for driving the driving mechanism 71. The driving mechanism 221 drives a first slider 191 to drive the first slider 191.
Except that the drive mechanism 222 is a link mechanism, it is substantially the same as the drive mechanism in FIG. 24, and the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

The first drive mechanism 222 includes a drive gear 223 attached to a drive shaft of a motor (not shown), a first link gear 224 meshing with the drive gear 223, and a mesh with the first link gear 224. Second link gear 2
25, a first link 226 having one end eccentrically attached to the first link gear 224 so as to be rotatable and the other end rotatably attached to the first slider 191, and one end being the second link. A second link 227 is eccentrically attached to the gear 225 so as to be rotatable and the other end is rotatably attached to the first slider 191. The first and second links 226 and 227 are symmetrically disposed about a center line between the first and second link gears 224 and 225 with a symmetric axis 228. The slot 200 of the first slider 191 is formed on the axis of symmetry 228.

In this drive mechanism 221, the drive gear 223
When the first and second link gears 224 and 225 rotate in the clockwise direction by a predetermined angle, the first and second link gears 224 and 225 rotate in opposite directions to each other.
And the second links 226 and 227 are the first slider 191
Is pressed and slid, and further rotated by a predetermined angle in the same direction, the first and second links 226 and 227 draw the first slider 191 to slide. By the sliding operation of the first slider 191 as described above, the discharged document stopper mechanism 171 is driven, and the stopper 174 moves to the retreat position and the restriction position.

FIG. 27 shows a state in which the original tray 60 is moved to the discharge side in order to reliably control the leading end of the discharged original by the stopper 174 of the discharged original stopper mechanism 171 when the originals of different sizes are mixedly loaded on the fed original. And the paper feeding side is pulled.

In FIG. 28, a refeed prevention member 82 for separating a fed document and a discharged document is also used as a discharged document regulating stopper corresponding to a large size document.

In FIG. 29, a discharge document stopper 229 is provided inside the document tray 60, and is projected upward from an opening 230 provided in the document tray 60 by a solenoid 231. According to this, the space below the document tray 60 can be effectively used, so that the size of the apparatus is prevented.

(Original Movement Prevention Unit)

As shown in FIG. 30, when the upper main body 1a of the copying machine main body 1 is opened due to jam processing or the like, the original movement preventing section 240 outputs the original on the upper side of the original tray 60 (discharge in this embodiment). (Document) is prevented from moving. This document movement prevention unit 240
1, the drive shaft 269, the conductive belt 24
2, transmission shaft 243, crankshaft 244, slider 24
5, a document pressing lever 246, and a leaf spring 247.

The drive shaft 269 is driven to rotate forward and backward by a discharge motor M4. When it rotates forward, it becomes the drive shaft of the discharge roller 145, and when it rotates reversely, it becomes the drive shaft of the document movement prevention unit 240. As described above, by using the same as the drive shaft of the existing discharge roller 140, it is not necessary to provide a special drive device.

The transmission belt 242 includes a pulley 248 provided on the discharge roller 145, a driving pulley 249, and the transmission shaft 2.
43, the tension is adjusted by a holding pulley 251.

The transmission shaft 243 is supported by a frame (not shown) in parallel with the drive shaft 241 of the discharge roller 145.
It has a one-way clutch 250 and a worm 252. The one-way clutch 250 has the conductive belt 24
Two have been bridged. One-way clutch 250
Power is not transmitted to the transmission shaft 243 for rotation in the direction of the solid arrow (forward rotation of the discharge roller), but power is transmitted to the transmission shaft 243 for rotation in the direction of the broken arrow (reverse rotation of the discharge roller).

The crankshaft 244 is supported by a frame (not shown) so as to be orthogonal to the transmission shaft 243, and detects the rotation angle by a worm wheel 253 meshing with the worm 252, a crank arm 254, and a sensor (not shown). And a detection plate 255. At the tip of the crank arm 254, an engagement shaft 256 projecting in parallel with the crank shaft 244 is provided.

The slider 245 includes a shaft portion 257, an arm portion 258 extending in a direction perpendicular to the shaft portion 257, and an engaging portion 25 extending from the arm portion 258 in parallel with the shaft portion 257.
It consists of nine. The shaft part 257 is provided for the crankshaft 2.
The document pressing lever 2
It is supported so as to be able to rotate together with 46. This shaft part 25
7 is provided with a torsion spring 261. Arm part 25
8 includes a crank arm 254 of the crank shaft 244.
A slide groove 262 is formed in which the engagement shaft 256 at the tip of the slide groove slidably engages. A locking recess 263 is formed on one side surface of the slide groove 262. The engaging portion 259 has a concave portion 264 in which one end of the torsion spring 261 is locked.

The document pressing lever 246 is substantially L-shaped, and a support shaft 260 is inserted through a shaft 265 thereof. The other end of the torsion spring 261 is locked in a groove 266 formed on the back surface of the document pressing lever 246, so that the document pressing lever 246 and the slider 245 can overlap each other as shown in FIG. Energized, slider 24
5 is stabilized by the engagement of the engaging portion 259 with the document pressing lever 246. The document pressing lever 246 has a retracted position for retracting inside the fixed document regulating plate 69 as shown in FIG. 32A and a fixed document regulating lever as shown in FIGS. 32B and 32C. It protrudes from an opening 72 formed in the plate 69 and is rotatable between a pressing position and a pressing position on the upper surface of a discharged document placed on the document tray 60.

The leaf spring 247 is connected to the original pressing lever 24.
In order to prevent the engagement shaft 256 of the crankshaft 244 from being detached from the locking concave portion 263 of the slide groove 262 of the slider 245 when the slider 6 is in the retracted position, the document pressing lever 246 and the slider 245 are moved in FIG. It is biased clockwise.

In the original movement preventing section 240 having the above-described configuration, in a normal state, the engaging shaft 256 of the crankshaft 244 is engaged with the engaging concave portion 263 of the slider 245, and the original pressing lever 246 is located at the retracted position. doing. In this state, as shown in FIG. 30, when the sensor 1c provided on the lower main body 1b detects that the upper main body 1a is slightly opened or that the lever for opening the upper main body 1a is operated. Alternatively, when the apparatus main body 1 detects an abnormal situation in which the upper main body 1a must be opened due to a paper jam or the like, the discharge motor of the discharge roller 145 rotates in the reverse direction.

As a result, the driving shaft 2 of the discharge roller 145
41 rotates in the direction of the solid line arrow, and this rotational force is transmitted to the one-way clutch 25 of the transmission shaft 243 via the transmission belt 242.
0, and the transmission shaft 243 rotates in the direction of the dashed arrow. As a result, the crankshaft 244 rotates in the direction of the arrow,
As the engagement shaft 256 of the crankshaft 244 slides in the slide groove 262 of the slider 245, the slider 2
45 and the document pressing lever 246 are integrally
32 in the clockwise direction in FIG. Then, as shown in FIG. 32B, the document pressing lever 246 projects from the opening 72 of the fixed document regulating plate 69 and contacts the upper surface of the discharged document on the document tray 60.

As shown in FIG. 32C, only the slider 245 rotates, and the torsion spring 261 is twisted by the rotation difference between the slider 245 and the document pressing lever 246, and the document A pressing force is applied to the pressing lever 246. At this time, a sensor (not shown) detects the off-edge of the detection plate 255 and
Stop reverse rotation of 45. As described above, since the discharged document on the document tray 60 is pressed by the document pressing lever 246, even if the upper main body 1a of the copying machine main body 1 is opened and the document tray 60 is inclined, the discharged document on the higher side becomes higher. Is prevented from moving to the lower side.

When the upper main body 1a of the copying machine main body 1 is returned, and this is detected, the discharge motor 145 is rotated again, and the engagement shaft 256 of the crank shaft 244 is moved to the slider 24.
5 slides in the slide groove 262, the slider 245 rotates counterclockwise, and the pressing force of the document pressing lever 246 is released. Subsequently, the slider 245 rotates counterclockwise together with the document pressing lever 246 and returns to the retracted position. At this time, the engagement shaft 25 of the crankshaft 244
When the sensor (not shown) detects the on-edge of the detection plate 255 when the lock 6 is locked in the locking recess 262 of the slide groove 262, the reverse rotation of the discharge motor stops.

When the discharge roller 145 is rotating forward, the one-way clutch 250 transmits its rotational force to the transmission shaft 24.
Although not transmitted to No. 3, a slight rotational force may be transmitted by the frictional force. However, in this case, the crankshaft 244
As shown in FIG. 32A, the engagement shaft 256 of the crankshaft 244 is locked in the locking recess 263, so that the slider 245 is prevented from rotating. Therefore, the document pressing lever 246 does not operate.

In the above embodiment, the original movement preventing section 240
Is provided on the paper discharge side to prevent the movement of the discharged document. However, if the paper supply side is higher when the upper main body 1a of the copying machine main body 1 is opened, the document movement prevention unit 140 is connected to the paper supply side. To prevent the movement of the fed document. In this case, the reverse rotation of the driving device of the pickup roller 83 and the separation roller 85 can be used.

Also, instead of pressing the original from above with the original pressing lever 246 as in the above-described embodiment, the original pressing lever 246 is brought into contact with the original tray 60 downstream from the end of the original, thereby lowering the original. The movement of the original can be prevented by regulating the end of the original.

Further, without providing the special document movement preventing section 240 as in the above-described embodiment, the sheet feeding using the existing document pressing plate 84 provided above the pickup roller 83 of the document feeding section 80 is performed. The movement of the document can be prevented.

(Original Document Refeeding Moving Section)

The document re-feeding moving section 270 moves the discharged document to the paper feed port 61 and re-feeds the document when the document circulation mode is set, or moves the discharged document to the center of the document tray 60. It is intended to make it easy to take out. As shown in FIGS. 33 and 34, the document re-feed moving unit 270 includes a moving belt 271, a guide rail 272,
A slider 273 and a refeed lever 274 are provided inside the document tray 60.

The moving belt 271 has three pulleys 276, 277, 278 arranged in a triangle on the base plate 275.
And the tension is adjusted by the holding pulley 279. The long side of the moving belt 271 is parallel to the document conveying direction. The moving belt 271 is connected to a gear 280 provided on one pulley 276 by a driving motor 281.
Is reciprocally movable by screwing the gear 282.

The guide rail 272 is formed of a straight bar having a circular cross section, and both ends are supported by the base plate 275 so as to be adjacent to and parallel to the long side of the conveyor belt 271.

The slider 273 is in the shape of an elongated plate,
As shown in FIG. 5, the guide rail 272 is inserted through a through hole 283 formed in the center. A protrusion 284 protruding from the back surface of the slider 273 and a screw 2
The moving belt 271 is sandwiched between an end surface of the backing plate 286 attached by the lever 85. Thus, the slider 273 can slide back and forth on the guide rail 272 as the moving belt 271 moves. A substantially L-shaped mounting bracket 2 for mounting a refeed lever 274 described later is provided on the upper surface of both wings of the slider 273.
87 is attached. One wing of the slider 273 is connected to a projection 28 formed on the lower surface of the document tray 60.
8 and another protrusion 2 on the upper surface of the other wing.
A leaf spring 289 that is in pressure contact with 88 is attached, thereby preventing rattling of the slider 273 and increasing the height of the slider 273 with respect to the document tray 60 in the direction of gravity.
At one end of the slider 273, a detection plate 290 for detecting the home position of the slider 273 by a sensor is protruded.

The refeed lever 274 is detachably attached to the tip of the mounting bracket 287 of the wing of the slider 273 so as to protrude above the two grooves 68 formed in the document tray 60 by the mounting structure described below. Attached to. That is, as shown in FIG.
At the lower end of the sheet 74, the first,
The second protruding pieces 291 and 292, and these protruding pieces 291 and 292
A third protruding piece 293 located between the protruding portions 92 is provided. On the opposing surfaces of the first and second protruding pieces 291 and 292, protruding ridges 294 are formed in a vertical direction. The first and second projections 291 and 292 having the projection 294 and the third projection 293 form a space into which the tip of the mounting bracket 287 is inserted. The inner surface of the tip of the third protruding piece 293 has an engagement hole 2 formed in the mounting bracket 287.
A projection 296 in a columnar state engaging with the projection 95 is protruded, and a reinforcing rib 297 is formed on the inner surface of the base. The protrusion 2
The tip of 96 is tapered in the direction in which the mounting bracket 287 is inserted.

In this mounting structure, the refeed lever 27
4 is inserted into the mounting bracket 287, first, the tapered surface of the projection 296 comes into contact with the tip of the mounting bracket 287, the third protruding piece 293 is spread outward, and the refeed lever 27
When the 4 is pushed in, the projection 296 of the third protruding piece 293 is engaged with the engagement hole 295 of the mounting bracket 287 and is prevented from coming off.
Next, in order to remove the refeed lever 274, the third protrusion 293 is flexed outward, the protrusion 296 is disengaged from the engagement hole 295, and the refeed lever 274 is pulled up. .

When the refeed lever 274 presses the rear end of the minimum size document, as shown in FIG.
Only the refeed lever 274 on the paper passing reference side presses the document, and the position is outside the half of the length of the document in the width direction from the document regulating plate 69. When the refeed lever 274 presses the rear end of the maximum size document, the document is pressed by two refeed levers 274, as shown in FIG. It is an intermediate point between the two refeed levers 274, and is outside the half of the length in the width direction of the document from the document regulating plate 69. Therefore, in any case, the original is placed on the original regulating plate 6 on the paper passing reference side.
9 and move without hitting the paper passing reference.

When the two re-feed levers 274 are pressed, the outer re-feed lever 274 is moved from the inner re-feed lever 274 so that the outer re-feed lever 274 mainly pushes the original. It may be arranged to protrude downstream in the document transport direction.

Further, it is preferable that the groove 68 of the document tray 60 is provided at a position where the end in the width direction of the document does not cover so as to prevent the movement of the document and prevent the occurrence of the document jam.

In the re-feed moving section 270 having the above-described structure,
When the document circulation mode is set, when all the documents have been discharged, the drive motor 281 rotates forward and the moving belt 271 moves. Accordingly, the slider 273 slides on the guide rail 272 from the home position toward the downstream side in the document conveying direction by a predetermined moving amount according to the document size. As a result, the refeed lever 274 presses the trailing end of the discharged document to move the discharged document to the paper feed port 61. Then, when the leading end of the document comes into contact with the leading end regulating plate 81 of the document feeding section 80 and the sheet feeding empty sensor is turned on, sheet feeding is performed again. On the other hand, the refeed lever 274 returns to the home position.

In the case of the normal original copy mode in which the original circulation mode is not selected, the discharged original is moved by the re-feed lever 274 to a position in the center of the original tray 60 where it can be easily taken out.

The re-feed moving unit 270 can perform the following control.

An original tray sensor SE4 (see FIG. 4) for detecting the bundle of originals discharged onto the original tray 60 is provided. Only when the sensor SE4 is turned on and the paper feed empty sensor is turned off, the sensor SE4 is turned on again. The paper feed lever 274 is moved. Accordingly, if the user erroneously removes the discharged document when the document is completely discharged even though the document circulation mode is selected, the sensor SE4 is turned off, and the refeed lever 274 does not operate, resulting in unnecessary operation. Is avoided.

When the discharge sensor is turned on while the original bundle is being moved or returned to the home position by the refeed lever 274, the return operation of the refeed lever 274 is stopped. As a result, even if the user mistakenly places the next document or obstacle on the document tray 60, the discharge sensor detects this and the return of the refeed lever 274 is stopped. Manuscripts and obstacles are prevented from being damaged.

If the paper feed empty sensor is not turned on even if the re-feed lever 274 is moved by a predetermined amount according to the document size, it is further moved by a predetermined amount. Thus, even when the apparatus erroneously detects the document size one size smaller, the document can be reliably moved to the paper feed port 61, and the paper can be fed again.

When the paper feed empty sensor is not turned on even if the re-feed lever 274 is moved by a predetermined amount according to the document size, and the paper feed empty sensor is not turned on even if it is moved further by a predetermined amount. Then, the movement of the refeed lever 274 is stopped. As a result, even if the user takes out the document while the refeed lever 274 is moving, the movement of the refeed lever 274 is stopped, and unnecessary operation is avoided.

When the discharge sensor is turned off before the re-feed lever 274 moves, the movement of the re-feed lever 274 is prohibited.
Thus, even if the circulation mode is selected, if the user erroneously takes out the ejected document when the document ejection is completed, the ejection sensor is turned off, and the refeed lever 274 is used.
Does not operate, and useless operation is avoided.

A different size detector is provided for comparing the size of the first document detected by the document size detector with the size of the subsequent document to detect mixed loading of different sizes of documents. , The refeed lever 274 is not operated when at least one of the count mode, the automatic circulating copy mode, and the automatic jam correction mode is selected. As a result, it is possible to prevent a paper feed error from occurring.

It is preferable to provide a warning means for issuing a warning when the refeed lever 274 is not operated.
Thus, it is possible to prompt the user to manually set a document in the paper feed port 61. In this case, it is preferable to start the operation when all the originals are reset on the original tray and the start key is pressed after the warning unit warns. According to this, the user can be forced to press the start key, and the copying process can be reliably restarted.

When the automatic jam correction mode is selected, the original is conveyed at the fastest speed when performing the sweeping out and the idle feeding process. The document conveyance speed referred to here is preferably the highest drivable speed in view of the hardware configuration of the document conveyance device. As a result, the sweeping without the copying process and the idle feeding process can be performed in a short time, and the waiting time is reduced.

<< ADF Document Conveying Mode >>

The document transport mode of the ADF 2 will be described.

In the present embodiment, the original transport mode includes a pre-step mode, a 2-in-1 mode, and a count mode in addition to the conventional double-sided mode. In order to accurately stop at SP, there are a scale mode suitable for normal paper and a pulse control mode suitable for thin paper. Further, in the document transport mode, a document circulation mode can be set. Also, an automatic jam correction mode can be set when a paper jam or a document jam occurs. When the original is transported, 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 the original is set to the intermediate position IP, and set at the nip portion of the registration roller 89. Is called the advance position. If you do not specifically state the size of the document,
The small size is assumed to be A4 horizontal feed, and the large size is assumed to be A3 vertical feed.

Each of the document transport modes is described in JP-A-7-23.
Since the modes are known modes described in detail in Japanese Patent Application Laid-Open No. 9586, a schematic operation of those modes will be described here.

The scale mode is a mode in which the leading edge of the document conveyed by the conveyance belt 123 is brought into contact with the scale 125 to forcibly stop the document. In this mode,
By setting the conveyance force of the conveyance belt 123 to be weaker than the buckling resistance of the document, a slip occurs between the document and the conveyance belt 123 when the leading edge of the document comes into contact with the scale 125, and the document stops accurately at the reference position SP. To be done.

In the pulse control mode, the scale 125 is retracted downward from the upper surface of the document table glass 29, and the registration rollers 89 and the conveyance belt 123 are moved by a single main motor (stepping motor) M3 so that both conveyance speeds are reduced. The main motor M3 is driven so as to be the same, and the main motor M3 is controlled by the number of pulses corresponding to the length L by which the document waiting immediately before the registration roller 89 is conveyed to the reference position SP, so that the scale motor 125 is brought into contact with the scale 125. In this mode, the original is stopped without being stopped.

The double-sided mode is a mode in which an image is formed on both sides of one copy sheet or on both sides of two copy sheets. The first double-sided original is conveyed to the original platen glass 29, conveyed to the original discharge section 140 without being exposed, and inverted by the reversing roller 141, and the back side is first exposed and copied. Subsequently, the original is inverted again, the front side is exposed and copied, and then the first double-sided original is discharged.

In the pre-step mode, when the size of the original is less than half the size from the exposure reference position SP to the advance position of the original, the preceding original is stopped with its leading end portion coincident with the exposure reference position SP and stopped. The next document (second sheet) is transported to a position where the leading end of the next document (second sheet) coincides with the intermediate position IP, and the next document (third sheet) is fed in advance until the leading end contacts the registration roller 89. The mode to keep.

The 2-in-1 mode is a mode in which two originals are arranged as a set on a platen glass 29 and an image is formed on one copy sheet. The first document is first conveyed onto the platen glass 29, the front edge of the second document is stopped by contacting the registration roller 89, and then the rear edge of the first document is aligned with the front edge of the second document. And simultaneously transport the two originals to the exposure reference. When the first and second originals have been exposed and are discharged from the original platen glass 29, the third original is conveyed onto the original platen glass 29.

The count mode is a 2-in-1 mode,
In order to check whether the number of originals is an odd number or an even number in a two-sided copy or a composite copy, before starting the copy process using the ADF 2, the original is pre-adjusted without a copy operation.
This mode refers to a mode in which the document is cycled in F2 and the number of documents is counted. Since the copy operation is not involved in the count mode, it is preferable to perform the processing as fast as possible (short time). Even in the count mode, if the document is stopped at the exposure reference position SP, the distance between the documents becomes large,
The time during idle feeding increases. Therefore, in the count mode, the document is temporarily stopped based on the time when the rear end of the document reaches a predetermined stop reference position on the document table glass 29 (near the registration roller 89).

The document circulation mode is a process of moving the discharged document on the document tray 60 to the paper feeding port 61 by the re-feeding moving unit 270 after all the documents are discharged after the copying of the document is completed. And copying the original again. The automatic jam correction mode is a mode in which when a paper jam or a document jam occurs, the copy process after the occurrence of the jam is automatically started by executing the document sweep mode, the idle feeding mode, and the above-described movement process of the discharged document.

The sweep mode is a mode in which, when a paper jam occurs, not only the original being conveyed in the ADF 2 but also all the originals remaining in the paper feed port are discharged without a copying process. The idle feed mode is used when a paper jam occurs, in the sweep mode, after the document is returned to the paper feed port by executing the moving process, or when a document jam occurs.
After all documents have been returned to the feeder by the operator,
This is a mode in which a document that has already been copied before a jam occurs is conveyed and discharged without performing a copy process. Then, after the end of the idle feeding mode, the copying process is automatically restarted.

<< Copier Control Circuit >>

The copying machine of this embodiment includes a CPU 1 for controlling the copying machine body 1 shown in FIG. 38 and a CPU 2 for controlling the ADF 2 shown in FIG.
The PU1 and the CPU2 exchange information at necessary timing.

When comparing the motor and the sensor used in FIG. 39 and the following description with the embodiment of the document feeder 2,
The pickup motor M1 is a motor for rotating the leading end regulating plate 81 and the document pressing plate 84, and the paper feed motor M2 is a motor for driving the pickup roller 83, the separating roller 85, and the intermediate conveyance roller 87, and includes a main motor. M3
Is a motor for driving and printing the registration roller 89 and the conveyor belt 123, and the discharge motor M4 is a motor for driving the discharge roller 145. The document moving motor M5 is a drive motor 281 for moving the refeed lever 274 of the document refeed moving unit 270. The FD matching motor M6 is
The second slider 193 of the driving mechanism of the discharged document stopper 174 of the document regulating unit 170 is moved in the document conveying direction (FD).
The drive motor 218 is moved to the next position. The CD aligning motor M7 is connected to the ejected document stopper 174 of the document regulating unit 170.
Is a drive motor 205 for rotating the stopper by moving the first slider 191 in a direction (CD) perpendicular to the document conveyance direction. Feeding pressure variable motor M8
Reference numeral denotes a drive motor 105 of the paper feed pressure variable mechanism 103 of the document feeder 80.

The empty sensor SE1 is a paper feed port 61
Is a paper feed empty sensor for detecting a document set in the printer. The registration sensor SE2 is a sensor that is installed immediately before the registration roller 89 and detects arrival and passage of a document. The discharge sensor SE3 is a sensor that is installed at the entrance of the reversing roller 141 and detects a document passing therethrough. The width sensor SE10 is installed side by side with the sensor SE2 and detects the size of the document in the width direction. Cam sensor SE
Reference numerals 11 and SE12 denote sensors for detecting rotation of the document regulating plate 81 and the document pressing plate 84, respectively.

The paper discharge tray sensor SE4 is a sensor for detecting a document placed on the paper discharge side of the document tray 60. The original moving lever home sensor SE5 is a sensor that detects the home position of the refeed lever 274.

The FD matching sensor SE6 is a sensor for detecting the home position of the second slider 193.

The CD1 alignment sensor SE7 is a sensor that moves the first slider 191 and detects the restricted position of the ejected document stopper 174.

The CD2 alignment sensor SE8 is a sensor that moves the first slider 191 and detects the retracted position of the discharged original stopper 174.

The paper feed sensor SE9 is disposed immediately after the separation roller 85 to detect the arrival and passage of the original,
This sensor detects the length of the document in the FD direction and the size of the document.

Document movement prevention lever home sensor SE13
Is a sensor that detects the home position of the document pressing lever 246 of the document movement prevention unit 240. Width sensor SE10
Means that the size of the document in the width direction is set in parallel with the sensor SE2. What are the cam sensors SE11 and SE12?
Sensors for detecting the rotation of the document regulating plate 81 and the document pressing plate 84, respectively.

FIG. 40 shows the copying machine operation section. In this operation unit, 100 is a copy start key, 101 is a numeric keypad, 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 double-sided mode display LED, 106b is a 2-in-1 mode display L
ED, 106c is a count mode display LED, 106d
Is a document circulation mode display LED, and a mode selection key 106
The mode selected by the display LED 106a, 1
06b, 106c, and 106d are displayed.

<< Control of Copying Machine Body >>

First, the control of the copying machine main body 1 will be specifically described with reference to a flowchart. In the following description, on-edge means that switches, sensors, signals, and the like are switched from the off state to on state, and off-edge means that switches, sensors, signals, and the like are switched from the on state to off state. . Further, the sensors SE1,
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. When the circulation mode is selected by the operator, the circulation mode flag is set to "1".

<< Main Routine >>

FIG. 41 shows a CPU for controlling the main body 1 of the copying machine.
1 shows a main routine. Power is turned on and CPU1
Is reset, and when the program starts, S
In step 1, 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 forming an electrostatic latent image on the sheet 0, S8 is an APS (automatic sheet selection) processing subroutine for automatically selecting a sheet of an appropriate size from the document size and the copy magnification, S
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.

<< Input processing >>

FIG. 42 shows the control of the input process S3 of the CPU 1. In this input process S3, an input from the copier operation unit shown in FIG. 40 is processed. In this input processing, S3-
When the on edge of the document selection key 105 is detected in step 1,
In S3-2, it is determined whether or not the thin paper mode display LED 105a is on. If the LED 105a is on, S3-3.
In step S3-4, the LED 105a is turned on to set the LED 105a to the copy state of a thin paper document.

If the on-edge of the document selection key 105 is not detected in S3-1, the mode selection key 10 is 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 or not the LED 106b and the LED 106c are in the on state.
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. Set.

<< Display processing >>

FIG. 43 shows a display unit 1 in the copier operation unit.
In step S4-1, it is determined whether or not the forgotten flag 1 is set to "1". If the forgotten flag 1 is set, the process proceeds to step S4-2.
To display the paper feed unit jam display 104a on the display unit 104. Next, in S4-3, it is determined whether or not the forgotten flag 2 is set to "1". Is displayed. In addition, forgetting flag 1
Or, when 2 is set to “1”, the display unit 104 is notified of the removal of the jammed paper as illustrated. further,
In S4-5, other necessary displays are processed.

<< Erase >>

FIG. 44 shows the erase subroutine executed in S6. In this subroutine, first, S6-1
To determine whether the first half erase flag is "1". If the first half erase flag is “1”, in S6-2,
The eraser 13 removes the charge in the first half of the area on the photoconductor corresponding to the document placed on the platen glass. For example, when the area corresponding to the A3 size should be charged on the photosensitive member in view of the size of the original placed on the original platen glass or the position of the original, the first half eraser flag is set to "1". Is set, the charge is removed by illuminating the first half of the charged area on the photoconductor corresponding to the A3 size. On the other hand, if the first half eraser flag is “0”, the second half erase flag is set to “1” in S6-3.
It is determined whether or not the second half erase flag is “1”.
In step 6-4, the eraser 13 removes the electric charge in the latter half of the area on the photoconductor corresponding to the original placed on the original glass 29. However, the second half erase flag is also "0"
If so, the inter-image portion is erased in S6-5.

More specifically, A of a format in which paper is fed from the last original
When the DF is adopted, the 2-in-1 mode is set, and when an odd number of originals are set on the original tray 60, the first half erase flag is set to "1" in the copy processing 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 125 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 entire second document is then copied on a single sheet by itself.

<< Scan >>

FIG. 45 shows a subroutine of scanning by the optical system 20 executed in S7. First, it is determined in S7-1 whether or not the pre-step mode is set, in S7-2, it is determined whether or not the flag LSIZE is "1", and in S7-3, it is determined whether or not small-size paper has already been fed. I do. Flag LS
ISE is set to “1” when a large-size document is set at the exposure position, and is transmitted to the CPU 1. S7-
1. If YES is determined in all of steps S7-2 and S7-3,
The book scan is processed in 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.

<< APS Processing Routine >>

In the APS control routine, as shown in FIG. 46, 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, in S8-2, APS processing is performed, 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). If a sheet of a suitable size is not stored in the sheet feeding unit, whether the switch SW2 is turned on in S8-4. Determine whether or not. This switch SW2 is a switch for instructing whether or not to convert the inch system size to the metric system size (A size or B size). For example, in a copying machine using the metric system size as the reference size, the switch SW2 is When turned on, the size of the inch system read in the APS mode in S8-5 is converted as shown in the following Table 1, 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 right metric size in Table 1 is converted to the left inch size. In this table, L means the vertical direction (longitudinal direction), and T means the horizontal direction (short side direction).

[0193]

[Table 3] Read 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)

<< Document Stop Position Processing >>

In the document stop position processing (S9), as shown in FIG. 47, the document stop position adjustment switch SW is set in S9-1.
It is determined whether or not 1 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 adjustment switch SW1 is turned off, the process returns.
2, the original mode is determined, and S9-3 and S9 are selected according to one of the one-side mode and the two-side mode 2-in-1 mode.
The process branches to -4, S9-5, and the adjustment amounts ADJ1, ADJ2, and ADJ3 of the document stop position input from the 10 key are stored in the RAM of the copying machine main 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 conveyance 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 copying machine to the CPU 2 of the ADF 2, and the drive system is controlled based on the data. Thus, the adjustment amounts ADJ1, ADJ2, A
By inputting DJ3, it is possible to adjust the document stop position in various modes and the interval between two documents exposed simultaneously in the 2-in mode to appropriate values.

<< Control of ADF >>

Next, the control of the ADF 2 will be specifically described with reference to a flowchart.

<< Description of Pulse and Timer >>

Before describing the control procedure of the CPU 2 for controlling the ADF 2, a counter used in the control, a pulse for controlling the main motor M3, and a 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 60 (when the empty sensor SE1 is turned on)
It is set to “1” and is incremented if the sensor SE1 is on at the off edge of the registration sensor SE2,
It is decremented at the on edge of the flag DCHG requesting the exchange of the original. The copier body 1 controls so as to feed the number of sheets obtained by multiplying the value of DCNT1 by the number of copies.

Counter DCNT2: Counts the number of documents in the transport path of ADF2 during paper feeding. 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 in pre-step mode, 2-in-1 mode, and double-sided mode to count the number of sheets ejected during document exchange processing. 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.

A counter PLSCNT2 counts the number of pulses of the main motor M3 since the registration sensor SE2 was turned off. It is incremented during forward rotation and decremented during reverse rotation. Counter GCOUNT: Used to count the number of fed sheets in the count mode, sweep mode, and idle feed mode. Incremented when paper is fed,
Reset at the start of feeding the first sheet. Counter GCOUNT2: Counts the number of sheets fed in a mode other than the count mode, the sweep mode, and the idle feed mode. It is incremented at the completion of paper feeding, and is initialized to "0" if it is not the sweep mode at the time of feeding the first sheet. Counter PLSCNT5: counts the amount of movement of document moving motor M5. Always decrement.

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 when the main motor M3 is driven to rotate forward to when it is decelerated when a small-size document is conveyed in the pre-step mode. At the end of this pulse number, advance feeding of the next document is started.

Pulse P02: the number of pulses from when the main motor M3 is 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 time when the main motor M3 is driven to rotate forward to the time when the main motor M3 is decelerated 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 original platen glass 29 in the 2-in-1 mode, and when the next large-size original is conveyed, the main motor M3 is driven forward and then decelerated. The number of pulses before being performed.

Pulse P06 (A4 horizontal feed + α, or L /
2): The number of pulses from when the main motor M3 is driven forward to when it is turned off when two large-sized originals are conveyed following two small-sized originals on the platen glass 29 in the 2-in-1 mode. (Stop temporarily for discharging 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 the registration sensor SE2 is turned off in the 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 ejected in the in-one mode, a timing is taken in which the main motor M3 is turned on after being turned on.

Timer T501: 2 in the second embodiment.
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. Timer T502: A timing is taken from the stop of the original moving motor M5 to the start of reverse rotation. Timer T601: Timing from brake ON to brake release by FD matching motor M6. Timer T602: Timer for detecting malfunction of the first slider by the CD matching motor M7. The timing from the start of M7 reverse rotation to the detection of SE7 on-edge is set. Timer T603: Timer for detecting malfunction of the first slider by the CD matching motor M7. The timing from the start of M7 normal rotation to the detection of SE8 on-edge is set. Timer T604: a timer for detecting a movement (operation) failure of the second slider by the FD matching motor M6. The timing from turning on M6 to detecting the edge of SE6 is set.

<< Main Routine >>

FIG. 48 shows a main routine of the CPU 2 for controlling the ADF 2. When the power is turned on and the CPU 2 is reset and the program starts, SS1
To clear the RAM, reset various registers, and perform initial settings for 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 in SS8, the process returns to SS2 after the end of the internal timer. SS3 is AD
This is a subroutine for checking the opening / closing of each opening / closing mechanism for opening / closing processing of the document table glass of F and jam clearance of the ADF to determine whether each section is open or closed. SS4 is a subroutine for setting the document transport speed of the ADF2. SS5 is a subroutine for exchanging an original on the original platen glass 29. SS6 is a subroutine for counting various timers. SS7 is the copier body 1
This is a subroutine for controlling a document pressing lever of a document movement prevention unit for preventing a document located on the upper side of the document tray 60 from moving to the lower side when the upper portion 1a of the document tray 60 is opened. SS8 performs other processing, that is, A / D conversion,
It processes input processing, output processing, paper jam detection, and the like.

As shown in FIG. 49, the interrupt processing for the CPU 2 includes various interrupt processing such as controlling the main motor M3 in SS10, and data transmission processing and data reception processing with the CPU 1 in SS11 and SS12. The processing is performed as appropriate regardless of the processing in.

<< Initial Settings >>

FIG. 50 shows a subroutine of initialization (SS1) executed by CPU2. In SS1-1, RA
Each data in M and each counter are cleared. SS1-2
Then, the timers T101, T102, T202 and T301 are reset. In SS1-3, each flag is reset. In SS1-4, each motor M1, M2, M3, M4,
The scale solenoid SL1 is turned off. In SS1-5, the internal timer is set to a predetermined value. In SS1-6, 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]

In the home check subroutine shown in FIG. 51, it is checked whether or not the leading end regulating plate 81 and the pressing plate 84 (collectively referred to as a "pickup unit") should be at a predetermined home position. First, SS1-6
At -1, it is determined whether or not the sensor SE1 is off, and at SS1-6-2, it is determined whether or not the sensor SE2 is off. If the sensors SE1 and SE2 are both off, that is, if there is no original in the original tray 60 and there is no original at the advance position, SS1-
At step 6-3, the document feeding status K is set to "1", and a process for returning the pickup unit to the home position is executed. If there is a document in either the document tray 60 or the advance position and either the sensor SE1 or SE2 is on, the feed status K is set to "2" in SS1-6-4 and the home position is set. The return process is not executed and the current state is maintained.

<< Open / Close Check >>

FIG. 52 shows details of the SS3 open / close check subroutine. In this subroutine, SS3-1
To determine whether or not the ADF 2 is closed with respect to the platen glass 29. If the ADF 2 is closed, it is determined in SS3-2 and SS3-3 whether the cover 93 on the sheet feeding side and the cover 147 on the sheet discharging side are closed, respectively, and both covers 93 and 147 are closed. SS3 if you have
At -4, it is determined whether the paper feeding 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). If K = 2, the home check processing is not executed and SS3-
It is determined in step 12 whether or not copying is in progress.
If -6 is not executed and copying is not in progress, it is checked in SS3-6 whether there is any document left behind in the ADF 2 after jam processing, for example. On the other hand, if it is determined in SS3-1 that the ADF 2 is open with respect to the platen glass 29,
In S3-7, the jam state is reset irrespective of whether the document has jammed in the paper feeding unit or the paper discharging unit of the ADF 2. Thus, even if the document is jammed inside the ADF 2, opening the ADF 2 opens the platen glass 29.
An original can be placed on top of it for copying. Therefore, a user who intends to copy a document by placing the document on the platen glass 29 without using the ADF 2 can make a necessary copy prior to the jam processing of the ADF 2.
Next, when the jam state is reset, or when the covers 93 and 147 of the paper feeding unit or the paper discharging unit are open,
At SS3-8, each data and each counter in the RAM are cleared, and at 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 missing>

FIG. 53 shows details of the forget-to-take check subroutine of SS3-6. In this subroutine, first, in SS3-6-1, it is determined whether or not the sensor SE1 is on, that is, whether or not there is a document on the document tray 60. If the sensor SE1 is off (there is no document), the forgetting flag 1 and the forgetting flag 2 are reset to "0" in SS3-6-10. On the other hand, the sensor SE1
Is determined to be on (there is a document), it is determined in SS3-6-2 whether or not 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 (there is no document). If so, the forgotten flag 1 is reset to "0" in SS3-6-3, and if the sensor SE2 is on (there is a document), the forgotten flag 1 is set in SS3-6-4.
Is set to “1”. Next, in SS3-6-5, it is determined whether or not the sensor SE3 is off, that is, whether or not there is a document in the reversing section.
In S3-6-6, the forgotten flag 2 is reset to "0", and if the sensor SE3 is turned on (there is a document), SS3-6.
At -7, the forgetting flag 2 is set to "1". 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. Thereby, in SS2-6-9,
When the original is set on the platen tray 61, the ADF 2
The user is able to respond promptly because the presence or absence of a document left behind is checked and copy processing is prohibited. In addition, if an operation panel or the like is provided to display the position of the document that has been left behind, the position of the document that has been left missing can be immediately known, and prompt action can be taken.

<< Speed Setting >>

FIG. 54 shows a speed setting subroutine executed in SS4. Here, the document conveying speed (belt speed) by the conveying belt 123 is V0, V1, V2,
Set it to V3. The belt speeds V1, V2, and V3 are values corresponding to the respective copy speeds, with three types of copy speeds depending on the model of the copying machine body.

The belt speed V1 is a speed at which the copy productivity is maintained at 100% in combination with a model having A4 landscape 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 copying machine body 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 (copy cycle per minut
e). From the nip of the registration roller 89 to the exposure reference position S
Assuming that the distance to P is L, the transport distance at the time of document exchange in the pre-step mode is L / 2, and the document exchange time is (L / 2V1). Therefore, L / 2V1 ≦ 0.3, V
1 ≧ L / 2 × 0.3.

The belt speed V2 is a copy speed of 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 conveyed 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, or 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 it is the pre-step mode in SS4-3, the copy speed is checked in SS4-4.
Copy speed is the copy machine body 1 transmitted from CPU 1
Check based on copy speed data. If the copy speed is 60 cpm, the belt speed is set to V1 at SS4-5.
At 6, the belt speed is set to V2. Also, 30cp
If m, 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, if the belt speed is V
When set to 1, V2 and V3, respectively
In S4-9, SS4-10, and SS4-11, the current control values are set to I1A, I2A, and 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 F2 is set in any of these states, the load on the transport belt 123 is small at that time, so that the main motor M3 is controlled in a normal trapezoidal manner in SS4-13 (see FIG. 56A). 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 or not the main motor M3 is decelerating. ), 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 eliminated (SS4-17) (FIG. 56).
(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 PU1, the setting may be performed by a dip switch built in ADF2. Alternatively, this type of data detection means may be provided in a contact portion of the ADF 2 with the copying machine main body 1. Specifically, a magnet indicating the copy speed is installed on the upper frame of the copying machine body 1 and the ADF 2
Is provided with a sensor for detecting the magnet. CP
U2 reads the copy speed of the copying machine body 1 based on the signal from the sensor and indicated by the magnet, and sets the belt speed.

<< Document Replacement >>

FIG. 57 shows a document exchange subroutine executed in SS5. In this subroutine, SS5-2
Checks MODE, and performs the following processing based on the value. MODE is set to a predetermined value according to the document transport mode selected by the operator.

First, MODE is determined in SS5-2.
When MODE is "0", a start check is processed in SS5-3. When the value is "1", the sheet feeding process is executed in SS5-1, the pre-step set in SS5-4, and the SS5-5.
, And the leading end stopper control is executed in SS-13. In the case of "2", a sheet feeding process is executed in SS5-1, a 2-in-1 set is executed in SS5-6, a sheet is ejected in SS5-7, and a leading end stopper control is executed in SS-13. In the case of "3", "5", or "6", the sheet feeding process is executed in SS5-1, and the number of documents is counted in SS5-8.
In step S5-9, the count sheet is discharged, and in step SS-13, the leading end stopper control is performed. SS5 for "4"
1 to execute a sheet feeding process, SS5-10 to execute a sheet feeding process for the duplex mode, SS5-11 to execute a sheet discharging process,
In step S-13, the tip regulation stopper control is executed. MOD
If E is any other value, other operations are processed in SS5-14. When the circulation mode is selected by the operator, SS5-11, SS5-9, SS5-
7. After execution of SS5-5, the moving process SS5-12 is executed.

<< Start check >>

FIG. 58 shows a start check subroutine executed in SS5-3. This subroutine
Processing is performed when MODE is “0”, that is, when the ADF 2 is on standby. First, in SS5-3-1, it is determined whether or not the empty sensor SE1 is on. If it is not turned on, the document has not yet been set on the tray 61, DCNT1 is reset to "0" in SS5-3-2, and the ADF use prohibition warning flag is set to "5" in SS5-3-2.1. "1" or not, and if "1", SS5
In 3-2-2, the ADF use prohibition warning flag is set to "0" to enable use of the ADF. If "0", the process returns immediately.

When the sensor SE1 is turned on (when a document is set on the tray 61), DCNT is set in SS5-3-3.
1 is set to “1”, and it is determined whether the flag of the stopper trouble 2 is “1” in SS5-3-3.1.
If "1", the ADF use prohibition flag is set to "1" in SS5-3-3.2 to prohibit use of the ADF, and the routine returns. If the flag of stopper trouble 2 is "0",
In SS5-3-4, 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 DCHG is set to "1" at the time when the print key is turned on and the scan for the number of copies is completed. Therefore, if the flag DCHG is "0", the process returns immediately. If the flag DCHG is "1", it is confirmed in SS5-3-4.1 that the refeed lever is not operating, and then in SS5-3-5. The flag DCHG is reset to “0” and SS5-3-
In step 6, the status K is set to "3". If the refeed lever is in operation, the sheet cannot be fed, and the process returns immediately. The status K is used in the paper feed subroutine. When the status K is set to "3", paper feed starts 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. In the count mode, the MODE is set to "3" in SS5-3-11.
MODE is set to "5" in S5-3-14, and in the sweep mode, MODE is set to "5" in SS5-3-15.
Set to. In the other document modes, the description is omitted. Subsequently, DCNT1 is decremented in SS5-3-12, and a feed amount setting process is executed in SS5-3-13.

<< Feeding amount set >>

FIG. 59 shows the contents of the feed amount setting subroutine of SS5-3-13. In SS5-3-101, it is determined whether or not the thin paper mode setting switch 105a of the operation panel is turned off, that is, the application mode. It is determined which of the thin paper modes 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. Also, SS5-3
At -102, it is determined whether or not the stop position adjustment mode is set, and at SS5-3-103, it is determined whether or not the one-sheet set flag is set to "0". The one-sheet set flag indicates that the last page document (which is first fed in the copying machine of the present embodiment) is set on the platen glass 29 when the number of documents is an odd number in the 2-in-1 mode. Is set to "1". As a result of these processes, when 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”, the SSS
5-3-105 to SSS5-3-107 are executed, otherwise, SS5-3-108 to SS5
The processing of -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 original 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 once switch back the first document in the 2-in-1 mode. When SB is increased, the trailing edge of the first document and the leading edge of the second document are 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 single-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.

<< Feeding >>

FIGS. 60 to 66 show a paper feed subroutine executed in SS5-1. In this subroutine, SS
Check the paper feed status K in 5-1 and check the value "0".
The following processing is performed based on .about. "8". When the status K is "1", the tip regulating plate 81 and the pressing plate 84 are moved to the home position. That is, as shown in FIG.
In SS5-1-2, the pickup motor M1 is reversed,
In SS5-1-3, it is determined whether or not the cam sensor SE11 that detects the home position of the tip regulation plate 81 and the pressing plate 84 is off-edge. The home position of the leading end regulating plate 81 is a regulating position (upward movement) with respect to the document, and the home position of the pressing plate 84 is a pressing release position (upward movement) with respect to the document.
It is. 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 8
1 is moved to the evacuation position, and the pressing plate 84 is moved downward to apply a 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 81 is at the retracted position and the pressing plate 84 is at the release position. Pickup motor M1 at 1-7
To rotate forward. At this time, if it is determined in SS5-1-7.1 that the document size is B4T or more, and if it is determined in SS5-1-7.2 that the number GCOUNT2 of copies of the document is 20 or more, SS5-1 In 1-7.3, the motor 105 of the paper feed pressure variable mechanism is driven to increase the paper feed pressure. Then, it is determined in SS5-1-8 whether or not the cam sensor SE11 is off edge. When the leading end regulating plate 81 maintains the retracted position by the forward rotation of the pickup motor M1 and the pressing plate 84 pushes the leading end of the document to the pickup roller 83, the cam sensor SE11 detects this.
Therefore, when the off edge of the cam sensor SE11 is confirmed in SS5-1-8, the pickup motor M1 is turned off in SS5-1-9, and the motor M2 is turned on in SS5-1-10. Further, the timer T104 is set in SS5-1-11, and the status K is set to "5" in SS5-1-12.

On the other hand, if it is determined in SS5-1-6 that the document is the first document, the main motor M is determined in SS5-1-13.
3 is turned on, and in SS5-1-13.1, it is determined whether the MODE is in the idle feeding mode. If in the idle feed mode, SS
The number of idle feeds is calculated in 5-1-13.2. The number of idle feeds is calculated by subtracting the number of copies returned (GCOUNT2) from the number of copies returned from the main body of the copying machine. Next, GCOUNT2 is returned to 0 in SS5-13.3,
After returning GCOUNT to 0 in S5-1-13.4,
The status K is set to "4" in SS5-1-14.

As shown in FIG. 63, when the status K is "4", it is the first sheet, so that the phase of the main motor M3 is adjusted and the pickup motor M1 is reversed from the home position to the pressed position. In SS5-1-15, the main motor (stepping motor) M3 is rotated for a predetermined time to determine 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 is in the phase A → A ′ phase → B
The rotation is performed by receiving a drive signal in the order of phase → B ′. The current control output and the A-phase drive signal of the main motor M3 are provided by the CPU2. 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. When the drive signal is also turned on, that 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, the stepping motor M3 is first driven before the document feeding operation is started, 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 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 front end regulating plate 81 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. Then, the motor M2 is driven in SS5-1-20 to convey the document forward, the timer T103 is set in SS5-1-21, and the status K is set in SS5-1-22.
Is set to "5" and the routine returns. Timer T103
Is to detect whether or not the document fed from the document tray 60 reaches a predetermined position within a predetermined time, thereby detecting whether or not the document is jammed. SS5-
The timer T104 set in 1-11 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 set based on the fact that the leading edge of the first document is located at the position of the leading edge regulating plate 81, but the second and subsequent documents are slightly displaced, and have reached the vicinity of the nip between the separating roller 85 and the separating pad 86. I have. 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 original has been conveyed to the position of the registration roller 89 by detecting the on-edge of the sensor SE2 (the presence of the original). 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,
S5-1-28, SS5-1-29, timer T
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 84 starts to move upward to the pressing release position. At this time, the tip regulating plate 81
Keeps the evacuation position. Further, SS5-1
At -37, the status K is set to "7" and SS5-1
If it is determined in -37.1 that the mode is the count mode, the idle feed mode, or the sweep mode, the GC is performed in SS5-1-37.1.
COUNT is incremented, and if not, GCOUNT2 is incremented in SS5-1-37.2.

When the status K is "7", the pressing plate 8
4 is moved to the upper pressure release position. That is, SS
When the on-edge of the cam sensor SE12 is confirmed in 5-1-38, the pickup motor M1 is determined in SS5-1-39.
Is turned off, and the motor 105 of the paper feed pressure variable mechanism is driven in SS5-1-39.1 to cancel the increase of the paper feed pressure. Subsequently, in SS5-1-40, it is determined whether or not the flag DSET is “0”. This flag DSET is set to "1" when the document is set at the exposure position. Only when the flag DSET is "0", the set status S is incremented in SS5-1-41. Furthermore, SS
In step 5-1-42, the status K is set to "8".

<< Pre-step set >>

FIGS. 67 to 78 show a pre-step set subroutine executed in SS5-4. In this subroutine, as shown in FIG. 67, the set status S is checked in SS5-4-1, and the value is set from "0" to "1".
The following processing is performed based on “0”.

As shown in FIG. 68, 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. Thus, the original is fed from the registration roller 89 onto the original table glass 29. And SS5
At -4-3, it is determined whether or not the PLSCNT1 has counted the pulse P01. When PLSCNT1 counts the pulse P01, the registration sensor SE is set in SS5-4-4.
It is determined whether or not 2 is off. If the registration sensor SE2 is off, the main motor M3 is decelerated at SS5-4-7, and the status S is set to "2" at SS5-4-8. On the other hand, if the registration sensor SE2 is on, S
In step S5-4-11, the status S is set to "7".

When PLSCNT1 is counting the pulse P01 (NO in SS5-4-3), as shown in FIG. 69, when the off-edge of SE9 is confirmed in SS5-4-12, SS-4- 12. The size detection 2 is executed in 12.1, and it is determined whether or not the flag LSIZE is "1" in SS-4-12.2. If the flag LSIZE is not "1", it is determined in SS-4-12.3 whether or not SE1 is on. If SE1 is on, SS-4-12.
SS-4-1 after incrementing DCNT1 in 4
In step 2.5, the status K is set to "3". If not, the status K is set to "1" in SS-4-12.6. Next, in SS-4-12.7, it is determined whether or not SE2 has detected an off-edge.
Return after detecting the size of the original in -4-13,
If not detected, the routine returns. Meanwhile, SS
If the flag LSIZE is "1" in 5-4-12.2, it is determined in SS-4-12.7 whether or not SE2 has detected an off-edge. The process returns after detecting the size of the document, and returns if it has not been detected.

Size detection 2 in SS-4-12.1
As shown in FIG. 70, similar to the normal size detection,
In SS-4-12.1-1, the number of transport pulses PLSCNT1 of the main motor M2 up to that point is set to SIZCNT1.
And a comparison with a predetermined value is performed in SS-4-12.1-2. The predetermined value is the number of pulses for determining whether or not the number is equal to or greater than letter Y. As a result of comparison, when it is determined that the size is equal to or larger than Letter Y, LSIZE = 1 is set as a large size in SS-4-12.1-3.

When the status S is "2", as shown in FIG. 69, it is determined whether or not PLSCNT1 has counted the pulse P02 in SS5-4-16. Pulse P0
2 is the number of pulses required to convey the document by a distance L / 2). Therefore, when PLSCNT1 counts pulse P02 (when the leading edge of the document reaches intermediate position IP),
At SS5-4-17, the main motor M3 is turned off and SS5
In step -4-18, the status S is set to "3". PL
When the SCNT 1 is counting the pulse P02, the above-described SS5-4-12 to SS5-4-13 are processed.

When the status S is "3", no processing is performed as shown in FIG. As shown in FIG. 71, when the status S is "4" (the completion of advance feeding of the next document), the main motor M3 is rotated at high speed in SS5-4-19. As a result, the first document is conveyed to the exposure position, and the second document is conveyed 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 125 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. 72, 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 125 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. 73, it is determined at SS5-4-34 whether or not the flag DCHG is "1". . The flag DCHG is transmitted from the CPU 1 of the copying machine main body 1 to request the ADF 2 to replace the original.

If the flag DCHG is "1", SS
The copy speed is checked in 5-4-34.1, and SS5-4-34.2 and SS5-4-34.
Check the magnification in step 3. When the copy speed is 60 cpm and the magnification is 1 or more, or the copy speed is 45 cp
If m and the magnification are 0.9 or more, the following processing is performed.
In SS5-4-35, the value of the paper feeding status K is checked. Here, the following processing is performed only when the status K is “2” and “8”. If the status K is "8" (when the next original has been fed in advance), SS5-4-
At 36, the status K is set to "2" and SS5-4-
At 37, it is determined whether or not the flag LSIZE is "1". If the flag LSIZE is "1" (if a large-size document has been fed), the status S is determined in SS5-4-38.
Is set to "1", DCNT1 is decremented in SS5-4-39, and DCNT3 for counting the number of originals to be discharged is set to "1" in SS5-4-40. 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-described SS5-4-39 is set.
Process ~ 40.

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.

From SS5-4-34.1 to SS5-4-3
As a result of checking the copy speed and the magnification in 4.3, when the copy speed is 60 cpm and the magnification is less than 1, or when the copy speed is 45 cpm and the magnification is less than 0.9, as shown in FIG. The timer T501 is set at 4-24.4, the status S is set to "10" at SS5-4-34.5, and the routine returns. The timer T501 is for setting the timing from the end of scanning to the start of document replacement.

When the status S is "10", FIG.
As shown in FIG. 73, if T501 has been completed in SS5-4-68, SS5-4-35 in FIG.
Steps 5-4-46 are processed.

When the status S is "7", the main motor M3 is rotated forward at high speed in SS5-4-47 as shown in FIG. 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 125 is protruded 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 is
9, the paper jam is handled 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", it is determined whether or not the PLSCNT1 has counted the pulse P04 in SS5-4-57, as shown in FIG. 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 125 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 conveyance belt 123, the main motor M3 is turned off in SS5-4-64, and S
In S5-4-65, the solenoid SL1 is turned off and the scale 125 is raised. Next, the MO at SS5-4-66
The DE 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 to be slightly shorter than the distance L, and the determination of NO in SS5-4-49 means that the document is longer than L (500 mm) or stays near the registration roller 89 due to conveyance failure. If you are. In such a case, a paper jam is detected. When the status S is "4", even if the registration sensor SE2 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. 77 shows a scale (SS5-4-27, S5).
S5-4-54, SS5-6-33). Here, it is determined in SS5-4-101 whether or not the thin paper flag is "0". If it is "0" (if the scale mode is selected), the solenoid SL1 is turned on in SS5-4-102. , Scale 125 on platen glass 2
9, the document is forcibly stopped at the exposure reference position SP.

<< Main motor high-speed rotation >>

FIG. 78 shows the main motor high-speed rotation (SS5-
4-2, SS5-4-19, and SS5-4-62) show a subroutine for high-speed normal rotation of the main motor M3. Here, SS5-4-201, SS5-4-21
In step 1, 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 set status has been turned off, that is, if the set status S is "1", "4",
If “9”, the flag LSIZ is set in SS5-4-202.
E is reset to “0”, and PLS is performed in SS5-4-203.
CNT1 is reset to "0", and the first half and second half erase flags are reset to "0" in SS5-4-204.
Subsequently, the advance prohibition flag is reset to “0” in SS5-4-205, and the flag DC is set in SS5-4-206.
HG is reset to “0”, and the flag DSET is reset to “0” in SS5-4-207. Furthermore, SS5-
In 4-208, the paper discharge status H is set to "1", and
In step S5-4-209, the solenoid SL1 is turned on to lower the scale 125, and in step SS5-4-210, the main motor M3 is set to high-speed normal rotation, and interruption is permitted. The main motor M3 is driven for each interruption, and the PLSCNT
1, counting is performed in PLSCNT2. On the other hand, S
If it is determined in S5-4-2111 that the main motor M3 is turned off, that is, if the set status S is "7", the above-described SS5-4-205 to 210 are processed.

<< 2-in-1 mode >>

FIGS. 79 to 89 show the processing executed in SS5-6.
3 shows a subroutine of IN1 set. In this subroutine, as shown in FIG. 79, the status S is checked in SS5-6-1, and the following processing is performed based on the values "0" to "14". When the status S is "0", no processing is performed. As shown in FIG. 80, when the status S is "1" (paper feeding is completed), the main motor M3 is rotated at high speed in SSS5-6-2. Thus, the original is fed from the registration roller 89 onto the original table 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), SS5-
In step 6-4, the size of the document is detected. Next, SS5-6
5, the single-sheet set flag is determined. If the single-sheet set flag is "0", the empty sensor SE is determined in SS5-6-6.
It is determined whether 1 is ON. If the registration sensor SE2 is off-edge and the empty sensor SE1 is on, that is, if the fed document is small and the next document is on the tray 61
, The timer T202 for feeding the next original is set in SS5-6-7, the main motor M3 is decelerated in SS5-6-8, and the status S is set in SS5-6-9.
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 there are two originals to be discharged on the original platen glass 29 at this time, the main motor M3 is decelerated at SS5-6-12 and the status S is changed to "5" at SS5-6-13. 8 ”. If DCNT3 is not "2", the status S is set to "5" in SS5-6-14.

In the above 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 original platen glass 29 at that time is detected. Then, at SS5-6-29, the empty sensor S
If it is determined that E1 is ON (if the document remains on the tray 61), DCNT1 is incremented in SS5-6-30.

When the status S is "3", as shown in FIG. 81, 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. When the status S is "4", no processing is performed.

When the status S is "5" (the next original is sent from the registration roller 89), the main motor M3 is rotated at high speed in SS5-6-31 as shown in FIG. As a result, the previous document and the subsequent document that have been switched back are conveyed to the exposure position. And
If it is determined in SS5-6-32 that the PLSCNT1 has counted the pulse P03, the main motor M3 is decelerated in SS5-6-33, and the scale 125 is determined in SS5-6-34.
(In case of scale mode).

Next, it is determined at SS5-6-35 whether or not the registration sensor SE2 is off, and at SS5-6-36 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 125, but the registration roller 8
9 will be staying in the vicinity of 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", as shown in FIG. 84, 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, SS5-6-47
The solenoid SL1 is turned off to raise the scale 125, the flag DSET is set to "1" in SS5-6-48, and the status S is set to "7" in SS5-6-49.

When the status S is "8" (feeding of a large-size original), as shown in FIG. 85, SS5-6-50
When the PLSCNT1 confirms the end of the counting of the pulse P06, the main motor M3 is turned off in SS5-6-51. Further, the status S is set to “9” in SS5-6-52.
Set to.

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. 6, the main motor M3
To rotate at high speed. Thus, the original is discharged from the exposure position. When the trailing end of the original to be ejected is detected by the ejection sensor SE3 in SS5-6-56, that is, when the trailing end of the original is separated from the transport belt 123, 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 125 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.

When the status S is "12", the processing shown in FIG. 87 is executed. The status S is set to "12" when the one-sheet set flag is "1", that is, when the number of originals is an odd number, and only 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 transport the document from the registration roller 89 to the scale 125. 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 at a distance of the document size from the scale 125.
And when PLSCN1 becomes (P04-size P),
Since the original is set on the original platen glass 29 at a distance corresponding to the original size from the scale 125, SS5-6
At -65, the main motor M3 is turned off. Next, SS5-
At step 6-66, the solenoid SL1 is turned off and the scale 125 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 a document remains on the document tray 60, 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 60,
At step 6-74, the status K is set to "1". As described above, when the number of originals is odd, the final original is set at a position apart from the scale 125 by the size of the original 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 even if 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. 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. 88 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 copy speed is confirmed in SS5-6-75.1, and SS5-6-75.2 and SS5 are determined for each speed.
Check the magnification at -6-75.3. Copy speed is 6
When the magnification is 0 cpm and the magnification is 1 or more, or when the copy speed is 45 cpm and the magnification is 0.9 or more, the following processing is performed. If the flag DCHG is “1”, SS5
In step -6-76, the value of the paper feed status K is checked. Here, the following processing is performed only when the status K is “2” and “8”.

If 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.

From SS5-6-75.1 to SS5-6-7
As a result of checking the copy speed and the magnification in 5.3, when the copy speed is 60 cpm and the magnification is less than 1, or when the copy speed is 45 cpm and the magnification is less than 0.9, as shown in FIG. The timer T503 is set at 6-75.4, and the status S is set to "14" at SS5-6-75.5, and the process returns. The timer T503 is for timing from the end of scanning to the start of document replacement.

When the status S is "14", FIG.
As shown in FIG. 88, if T503 has been completed in SS5-6-85, SS5-6-76 in FIG.
Steps 5-6-84 are processed.

<< Discharge >>

FIGS. 90 to 93 show SS5-5, 5-7,5.
The subroutine for paper discharge executed at -11 is shown. The paper discharge here is a paper discharge in the pre-step mode, the 2-in-1 mode, and the duplex mode. In this subroutine, FIG.
As shown in (5), the discharge status H is checked in SS5-5-1, and the following processing is performed based on the values "0", "1", "2", and "3".

As shown in FIG. 91, 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", as shown in FIG. 92, when the end of the count of the timer T301 is confirmed in SS5-5-11, the discharge motor M4 is turned off in SS5-5-12. I do. DCNT2 in SS5-5-13
Is decremented, and DCNT3 is decremented in SS5-5-14. Then, DCNT in SS5-5-15
It is determined whether or not 2 is “0”. If DCNT2 is "0", that is, if there is no original in the ADF machine, SS5-5
At -16, it is determined whether a paper jam has occurred. If a paper jam has occurred, the discharge motor M4 is reversed in SS5-5-17, and the status H is set to "3" in SS5-5-18. If there is no paper jam, SS5-
At 5-19, status H is set to "0" and SS5
If the circulation mode flag is determined to be "1" in -5-20, and if the mixed loading flag is determined to be "0" in SS5-5-21, the status HS is set to "6" in SS5-5-22.
And status I is set to "1" in SS5-5-23.
Set to. It is determined in SS5-5-20 that the circulation mode flag is "0", or if the consolidation flag is "1" in SS5-5-21 even if the circulation mode flag is "1", SS5- At step 5-24, the warning flag is set to "1". If DCNT2 is not "0" in SS5-5-15, that is, if there is still a document in the ADF, the status H is set to "0" in SS5-5-25 and the discharge operation is continued. Let it.

When the status H is "3", as shown in FIG. 93, when the original movement prevention lever home sensor SE13 detects an off-edge in SS5-5-26, the SS5
The discharge motor M4 is turned off at -5-27, and SS5-5-2 is turned off.
At step 8, the status H is set to "0".

<< Count >>

FIGS. 94 to 96 show a count subroutine executed in SS5-8. Here, the document is cycled through a subroutine of counting and discharging and moving, which will be described next, and the number of sheets is automatically counted, and the document is moved to the paper feed port. In this subroutine, as shown in FIG.
In 5-8-1, the status S is checked, and its value is “0”.
The following processing is performed based on .about. "4".

As shown in FIG. 95, 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 125, and the main motor M3 is rotated forward at high speed in SS5-8-4. Thus, the document is sent out from the registration roller 89 onto the document table glass 29. Furthermore, P5 in SS5-8-5
LSCNT1 is reset to "0", status S is set to "2" in SS5-8-6, and status H is set to "1" in SS5-8-7.

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", as shown in FIG. 96, when it is confirmed at SS5-8-17 that the PLSCNT2 has finished counting the pulse P09, the SS
At 5-8-18, the main motor M3 is turned off. Pulse P
Reference numeral 09 is for temporarily stopping the document on the document table 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 to at least when it passes through the nip portion of the registration roller 89. . 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 125, 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 and SS5-24.1 is not in the idle feeding mode, or if it is determined that SS5-24.1 idle feeding is not completed even in the idle feeding mode, the next original is determined. Status S is set to "0" in SS5-8-25 to wait for the
Reset to. If it is in the idle feeding mode and it has been completed, the status S is set to "4". If the sensor SE1 is off, the status S is set in SS5-8-26.
Is set to “4”. If the status H is "2" even when the discharge sensor SE3 is on or off, the processing of SS5-8-24 to 26 is performed.

When the status S is "4", all the originals have been sent out onto the original platen glass 29,
At -8-27, the main motor M3 is driven at a low speed. When it is confirmed that DCNT2 is "0" in SS5-8-28, that is, when there is no document on the platen glass 29, the main motor M3 is turned off in SS5-8-29, and SS5-8-29 is turned off. At 8-30, the solenoid SL1 is turned off to raise the scale 125, and at SS5-8-31, the status S is reset to "0". Next, SS5-8-3
1.1 is the 2-in-1 mode, and SS5-8-
If GCOUNT at 32, that is, if the number of documents is odd,
In SS5-8-33, the one-sheet set flag is set to "1".

<Count discharge>

FIG. 97 shows a count sheet discharging subroutine executed in SS5-9. In this subroutine,
In S5-9-1, the paper discharge status H is checked, 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), the discharge motor M4 is driven at a high speed in SS5-9-2. As a result, the reversing roller 141 and the discharge roller 145 rotate, and the document is
Sent to 0. Next, in SS5-9-3, the discharge sensor SE
3 is confirmed (the trailing edge of the original is the sensor S
After passing through the detection point of E3), the discharge motor M4 is decelerated in SS5-9-4. Further, the timer T301 is set in SS5-9-5, the status H is set to "2" in SS5-9-6, and DCNT2 is decremented in SS5-9-7.

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
The status H is reset to "0" at -9-10.

<< Size detection >>

FIG. 98 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 the width sensor SE10
The width sensor SE10 is set by ON and OFF of
The document is turned on by a document having a width dimension equal to or larger than B5 horizontal feed, and the width flag is set to “1”. Original size is SIZC
It is set by a combination of the value of NT1 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.

Next, in SS5-4-209.1, if the original is 1
It is determined whether or not it is the first sheet, and if it is the first sheet, SS5-4
After confirming that SIZE is not A3T in -209.2, the status HS is set to "1" in SS5-4-209.3. If the original is not the first sheet, SS5
In -4-209.4, it is determined whether or not the size is the same as that of the first sheet. If the size is not the same, the mixed loading flag is set to “1” in SS5-4-209.5 and the status is set in SS5-4-209.6. HS is set to “6”.

On the other hand, when the width flag is "0", FIG.
As shown in, the value of SIZCNT1 is checked in SS5-4-210, and SS5-4-211-
In SS5-4-217, a predetermined document size is set in SIZE. If it is shorter than 297mm, SS5-4-
At 213, it is determined whether or not the switch SW2 is turned on. If it is turned on, the size is set to "A4T" at SS5-4-214.
In step 4-215, the size is set to "letter T". 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.

[Double-sided set]

FIGS. 100 to 107 show a subroutine for processing the document transport in the duplex mode.
To determine the status "S", and from "0" to
The process branches to "7".

If the status S is "0", nothing is done. When the status S is "1", as shown in FIG. 101, the solenoid SL1 is turned on at SS5-10-2 to lower the scale 125, 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.
In step S5-10-9, the solenoid SL2 is turned on to operate the switching claw 144 to form an inversion path, and the original is again conveyed to the original platen glass 29. Also, SS5-10-10
Resets PLSCNT2 to "0" and starts counting from there. The status S is set to "2" in SS5-10-11.

If the status S is "2", as shown in FIG. 102, PLSCNT2 is set to P in SS5-10-12.
12 is determined, that is, whether or not the leading edge of the document that has passed the sensor SE3 has reached the position immediately before the transport belt 123 through the reversing path. Immediately before the leading edge of the document reaches the transport belt 123, the main motor M3 is rotated in reverse at SS5-10-13. In SS5-10-14, it is determined whether the document is a large size document. If the document is a large size document, the motors M3 and M4 are decelerated. In the case of a large-size document, both the leading edge and the trailing edge of the document may be sandwiched between the transport belt 123 and the document glass 29, resulting in a large load. 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 same operation and effect can be obtained even if the scale 125 is kept lowered from the upper surface of the original table glass 29. On the other hand, if the original is not a large original,
In step S5-10-20, the solenoid SL1 is turned off, the scale 125 is raised, and the leading end of the document interferes with the glass end surface.
Prevent jams and prepare for manuscript leading edge regulation.
Next, in SS5-10-16, 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 144, the solenoid SL is detected in SS5-10-17.
2 is turned off and the switching claw 144 is operated to switch the document conveyance path to a path toward the document discharge tray 60, and SS5-
At 10-18, PLSCNT2 is reset to “0”, and S
In step S5-10-19, the status S is set to "3".

When the status S is “3”, as shown in FIG. 103, it is determined whether or not PLSCNT2 has become P14.
In other words, the trailing edge of the original is 20 to 30 mm from the scale 125.
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 125.
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 125 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. 104, PLSCNT2 is set to P in SS5-10-27.
It is determined whether the document is conveyed until the end of the scale 125 is regulated by the scale 125.
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 the next original is present in the original tray 60. If there is, the original counter D is detected 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.

If the status S is "5", as shown in FIG. 105, it is determined in SS5-10-36 whether or not the original exchange request signal DCHG is set to "1" in the copying machine body 1. The following processing is performed only when DCHG is “1”. If the flag DCHG is “1”, SS5-1
The copy speed is checked at 0-36.1, and SS5-10-36.2 and SS5-10-36.
Check the magnification in step 3. When the copy speed is 60 cpm and the magnification is 1 or more, or the copy speed is 45 cp
If m and the magnification are 0.9 or more, the following processing is performed.

In SS5-10-37, it is determined whether the original has been set to the front side copy state. And DCHG
Is set to "1" and the exchange of the original is requested, and if the original is set to the front copy state, SS5-10-
At 38, the paper discharge control counter H is set to "1" and SS5
At -10-39, the number of originals to be discharged counter DCNT3 is set to "1", and at SS5-10-40, the status K is set.
Is set to "8", that is, whether or not the next original is set in the advance state. If the next original is in the advance state, status K is set in SS5-10-42. Change to “2” and decrement DCNT1 in SS5-10-42. Also, SS5-10-
In step 43, the status S is set to "1" and SS5-10
-44 sets DCHG to "0", SS5-10-45 sets DS
Set ET to "0". On the other hand, SS5-10-40
If it is determined that the status K is not "8", the solenoid SL1 is turned on, the scale 125 is lowered, and SS5
In step -10-47, the main motor M3 is driven to discharge the document on the platen glass 29 to the paper discharge section.
In step 8, the status S is set to "6" and the final document is discharged. In step SS5-10-44, DCHG is set to "0".
In SS5-10-45, DSET is set to "0".
If it is determined in SS5-10-37 that the document is set to the back side copy state, SS5-10-43 to 45 are executed.

From SS5-10-36.1 to SS5-10
As a result of checking the copy speed and the magnification at -36.3, when the copy speed is 60 cpm and the magnification is less than 1, or when the copy speed is 45 cpm and the magnification is 0.
When it is less than 9, as shown in FIG.
At -36.4, the timer T503 is set, and SS5-1 is set.
The status S is set to "7" at 0-36.5. Timer T
Reference numeral 503 denotes a timing from the end of scanning to the start of document exchange.

When the status S is "7", the state shown in FIG.
As shown in (5), if T501 has been completed in SS5-10-55, the above-described steps from SS5-10-36 to SS5-10-48 in FIG. 105 are processed.

When the status S is "6", as shown in FIG. 107, 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 125 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.

<Move>

FIGS. 108 to 114 are subroutines for processing the movement of SS5-12. First, status "I" is determined in SS5-12-1, and "0" to "0" are determined according to the value.
The process branches to “5”.

As shown in FIG. 109, when the status I is "0", no processing is performed. Status I is "1"
In the case of, whether or not the sensor SE4 on the discharge tray is ON in SS5-12-2 and SS5-12-3, respectively.
It is determined whether or not the empty sensor SE1 is off. If the output tray sensor SE4 is on and the empty sensor SE1 is off, all the originals have been ejected, so the original moving motor M5 is rotated forward in SS5-12-4, and in SS5-12-5. The status I is set to "2". If the output tray sensor SE4 is off, the output original is taken out, so the warning flag is set to "1" in SS5-12-6, and the status I is set to "1" in SS5-12-7. Set to "0". If the empty sensor SE1 is on even if the output tray sensor SE4 is on, documents remain in the paper feed port, so the warning flag is set to "1" in SS5-12-6. Then, the status I is set to "0" in SS5-12-7.

When the status I is "2", the state shown in FIG.
As shown in (5), it is determined whether or not PLSCNT5 is "0" in SS5-12-8, and the following processing is performed only when it is "0". At SS5-12-9, it is determined whether or not the empty sensor SE1 is on.
At 12-10, the original moving motor M5 is stopped, and SS5-1
In 2-11, the timer T502 is set, and SS5-12-
At 12, the status I is set to "3". If the empty sensor SE1 is off, P at SS5-12-13
LSCNT5 is set to 100, and status I is set to "5" in SS5-12-14.

When the status I is "3", the state shown in FIG.
As shown in (5), it is determined in SS5-12-15 whether the timer T502 has expired, and the following processing is performed only when the timer T502 has expired. In SS5-12-16, it is determined whether or not the output tray sensor SE4 is off. If the output tray upper sensor SE4 is off, the document moving motor M5 is rotated in reverse at SS5-12-17, and
Sets the status I to "4". If the output tray sensor SE4 is ON, the warning flag is set to "1" in SS5-12-19, and the status I is set to "6" in SS5-12-20.

When the status I is "4", the state shown in FIG.
As shown in (5), it is determined in SS5-12-21 whether the document moving lever (refeed lever) home sensor SE5 is on. If the document moving lever home sensor SE5 is on and at the home position, SS5-12-22
To stop the document moving motor M5, and set the status I to "0" in SS5-12-23. If the original moving lever home sensor SE5 is on and not at the home position, it is determined in SS5-12-24 whether the output tray sensor SE4 is on or not. The document moving motor M5 is stopped in SS5-12-25, the warning flag is set to "1" in SS5-12-26, and the status I is set to "6" in SS5-12-27. .

When the status I is "5", the state shown in FIG.
As shown in (5), it is determined whether or not PLSCNT5 is “0” in SS5-12-28. If PLSCNT5 is "0", the document moving motor M5 is stopped in SS5-12-29, and it is determined in SS5-12-30 whether or not the empty sensor SE1 is on. At step 12-31, the timer T502 is set. If it is not on, the warning flag is set to "1" at step SS5-12-33, and then the timer T502 is set at SS5-12-31. Sets the status I to "3". Also, SS5-12-28
If PLSCNT5 is not "0", SS5-12-
At 34, it is determined whether or not the empty sensor SE1 is on. Only when the empty sensor SE1 is on, the document moving motor M5 is stopped at SS5-12-35, and the timer T502 is set at SS5-12-31. At step 12-32, the status I is set to "3".

When the status I is "6", the state shown in FIG.
As shown in (5), it is determined at SS5-12-36 whether or not the output tray sensor SE4 is off, and the following processing is performed only when it is off. At SS5-12-37, the warning flag is set to "0", at SS5-12-38, the original moving motor M5 is reversed, and at SS5-12-39, the status I is set to "4".

<< Tip regulation stopper control >>

FIGS. 115 to 122 are subroutines for processing the tip regulation stopper control of SS5-13.
In S5-13-1, the status "HS" is determined, and the process branches to "0" to "8" according to the value.

When the status HS is "0", FIG.
No processing is performed as shown in FIG. When the status HS is "1", the FD matching motor M is set at SS5-13-2.
6 is executed, and it is determined in SS5-13-3 whether the FD matching home sensor SE6 has detected an edge. Only when an edge is detected, the following processing is performed. That is, the FD matching motor M6 is stopped in SS5-13-4, the trouble timer T604 is reset in SS5-13-4.1, and the brake timer T60 is reset in SS5-13-5.
1 is set, and the status HS is set to "2" in SS5-13-6.

When the status HS is "2", the status HS5
At -13-7, it is determined whether or not the timer T601 has counted up.
In step 3-8, the FD matching motor M6 is moved and SS5-
At 13-9, the status HS is set to "3".

When the status HS is "3", SS5
It is determined whether or not PLSCNT6 is “0” in -13-10, and only when it is “0”, FD is determined in SS5-13-11.
Stop the matching motor M6, set the brake timer T601 in SS5-13-12, and set C60 in SS5-13-13.
The D matching motor M7 is rotated in the reverse direction, and the trouble timer T602 is set in SS5-13-14.
To set the status HS to "4".

When the status HS is "4", the state shown in FIG.
As shown in FIG. 7, it is determined in SS5-13-16 whether the CD1 matching sensor SE7 is on, and only when it is on, the CD matching motor M7 is stopped in SS5-13-17, and SS5-13. Trouble timer T60 at -17.1
2 is reset and the status HS is set in SS5-13-18.
Is set to “4”.

When the status HS is "5", no processing is performed. When the status HS is “6”, SS5-1
At 3-19, the CD matching motor M7 is rotated forward, and SS5-13
The trouble timer T603 is set at -20 and SS5-
In step 13-21, the status HS is set to "7".

When the status HS is "7", the state shown in FIG.
As shown in FIG. 8, it is determined whether or not the CD2 matching sensor SE8 is on in SS5-13-22, and only when it is on, the CD matching motor M7 is stopped in SS5-13-23, and SS5-13. Trouble timer T60 at -23.1
3 is reset, the M6 home is detected in SS5-13-24, and the status HS is set to "8" in SS5-13-25.

When the status HS is "8", SS5
At -13-26, it is determined whether the FD matching sensor SE6 is on or not.
7, the FD matching motor M6 is stopped, and SS5-13-2
At 7.1, trouble timer T604 is reset and SS5
In a step 13-28, the status HS is set to "9".

FIG. 119 shows SS5-13-2 and SS5-
13 shows a subroutine for M6 home detection of 13-24. S
In S5-13-29, it is determined whether or not the FD matching motor M6 is stopped, and the following operation is executed only when the FD matching motor M6 is stopped. FD matching home sensor S with SS5-13-30
It is determined whether or not E6 is on, and if it is on, S is determined.
In step S5-13-31, the FD matching motor is rotated forward. If the motor is not turned on, the FD matching motor is rotated in reverse in step SS5-13-32, and the trouble timer T604 is set in step SS5-13-33.

FIG. 120 shows a subroutine for M6 movement of SS5-13-8. The document size is determined in SS5-13-34. If the document size is A5Y, SS5-13
-35 sets PLSCNT6 to P1, and if the document size is A4Y and letter Y, PLSCNT6 is set to PLS by SS5-13-36.
CNT6 is set to P2, the FD matching motor is rotated forward in SS5-13-37, and the trouble timer T1 is set in SS5-13-38. If the document size is A4T, PLSCNT6 is set to P3 in SS5-13-39. If the document size is B4T, PLSCNT6 is set to P4 in SS5-13-40 and FD matching is performed in SS5-13-41. The motor is reversed, and the trouble timer T604 is set in SS5-13-38.

FIG. 121 shows SS5-13-33, SS
Trouble timer T604, S set in 5-13-38
Trouble timer T602 set in S5-13-14,
And trouble timer T6 set in SS5-13-20
3 shows a count up processing routine. The count up of the trouble timer T604 is SS5-13-4
In step 2, the FD matching motor M6 is stopped, and SS5-13-43
To set stopper trouble 1 to "1". The count up of the trouble timer T602 is SS5-13-
At 44, the CD matching motor M7 is stopped, and SS5-13-4
5 sets stopper trouble 2 to "1". The count up of the trouble timer T603 is SS5-13
At -46, the CD matching motor M7 is stopped, and SS5-13-
At 43, the stopper trouble 3 is set to "1".

<< Document Movement Prevention Control >>

FIG. 122 shows a subroutine for document movement prevention control executed in SS7. In SS7-1, MOD
It is determined whether or not E is “0”, that is, whether or not the ADF is on standby. Only when MODE is “0”, the following processing is executed. Home sensor S of the original movement prevention lever in SS7-2
It is determined whether E13 is off. When SE13 is off, it is determined in SS7-3 and SS7-4 whether the lever pressing flag is "1" and the JAM reset flag is "1". If the lever pressing flag is not “1” and the JAM reset flag is “1”, the JAM reset flag is set to “0” in SS7-5, M4 is reversed in SS7-6, and SS7
At -7, the lever home return flag is set to "1". If the lever pressing flag is not “1” and the JAM reset flag is not “1”, no processing is performed. If the lever pressing flag is "1", M4 is stopped in SS7-8, and then the lever pressing flag is set to "0" in SS9.

When SE13 is on, SS7-
10. In SS7-11, it is determined whether the lever home return flag is “1” and the JAM occurrence flag is “1”. If the lever home return flag is not “1” and the JAM occurrence flag is “1”, S
In S7-12, the JAM generation flag is set to "0",
In S7-13, M4 is reversed, and the lever pressing flag is set to "1" in SS7-14. If the lever home return flag is not “1” and the JAM occurrence flag is not “1”, no processing is performed. If the lever home return flag is “1”, stop M4 in SS7-15 and then
At step 16, the lever home return flag is set to "0".

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a copying machine provided with a document feeder according to the present invention.

FIG. 2 is a cross-sectional view of the document feeder according to the present invention.

FIG. 3 is a cross-sectional view illustrating the shape of a document tray.

FIG. 4 is a plan view illustrating a planar shape of a document tray.

FIG. 5 is a cross-sectional view illustrating another shape of the document tray.

FIG. 6 is an enlarged view of a refeed prevention member.

FIG. 7 is a partially enlarged view of another embodiment of a refeed prevention member.

FIG. 8 is a cross-sectional view illustrating a document pressing plate.

FIG. 9 is a perspective view of a paper feed pressure variable mechanism.

FIG. 10A is a diagram illustrating a state in which a paper feed pressure is applied by a paper feed pressure variable mechanism.
(B) is a partially enlarged view showing the state at the time of evacuation.

FIG. 11 is a cross-sectional view illustrating operations of an intermediate conveyance roller and a registration roller.

FIG. 12 is a diagram illustrating the arrangement of a separating roller, an intermediate conveyance roller, and a registration roller.

FIG. 13 is a diagram illustrating the operation of an intermediate conveyance roller and a registration roller.

FIG. 14 (A) shows ADF2 rise, and FIG. 14 (B) shows ADF
Sectional drawing explaining operation | movement of each scale press mechanism at the time of 2 mounting.

FIG. 15A is a cross-sectional view illustrating the shape of a conventional discharge path guide, and FIG.

FIG. 16 is a cross-sectional view illustrating a document urging mechanism of a discharge roller.

FIG. 17 is a front cross-sectional view illustrating a document urging mechanism of a discharge roller.

FIG. 18 is a cross-sectional view illustrating another document urging rib of a sheet discharge roller.

FIG. 19 is a front cross-sectional view illustrating another document urging mechanism of a paper discharge roller.

FIG. 20 is a front view of a document regulating unit.

FIG. 21 is a cross-sectional view illustrating the operation of an A-type discharged original stopper mechanism in order.

FIG. 22 is a cross-sectional view illustrating a B-type discharged original stopper mechanism.

FIG. 23 is a perspective view showing a driving mechanism of a discharge original stopper mechanism.

FIG. 24 is a plan view showing a driving mechanism of a discharge original stopper mechanism.

FIG. 25 is a diagram illustrating an operation of a driving mechanism of a discharge original stopper mechanism.

FIG. 26 is a plan view showing another driving mechanism of the discharged original stopper mechanism.

FIG. 27 is a diagram showing another means for regulating the leading edge of a discharged document.

FIG. 28 is a diagram showing another means for regulating the leading edge of a discharged document.

FIG. 29 is a cross-sectional view showing another means for regulating the leading edge of a discharged document.

FIG. 30 is a front view of the copying machine showing a state in which an upper portion of the copying machine body is opened.

FIG. 31 is a perspective view of a document movement prevention unit.

FIG. 32 is a sectional view showing the operation of the document movement preventing mechanism in order.

FIG. 33 is a front view of a document re-feeding moving unit.

FIG. 34 is a plan view of a document re-feeding moving unit.

FIG. 35 is a plan view of a document re-feeding moving unit.

36A is a front view of a paper re-feed lever, FIG. 36B is a cross-sectional view taken along line BB of FIG. 36A, and FIG. 36C is a cross-sectional view of line CC of FIG.

FIG. 37 is a diagram illustrating a pressing position of a refeed lever.

FIG. 38 is a block diagram showing a control unit of the copying machine main body.

FIG. 39 is a block diagram showing a control unit of the ADF.

FIG. 40 is a plan view showing a key arrangement and the like of a copying machine operation unit.

FIG. 41 is a flowchart showing a main routine of the CPU 1 for controlling the copying machine main body.

FIG. 42 is a flowchart showing a subroutine of an input process in the CPU 1;

FIG. 43 is a flowchart showing a subroutine of a display process in the CPU 1;

FIG. 44 is a flowchart showing an erase subroutine in the CPU 1;

FIG. 45 is a flowchart showing a scan subroutine in the CPU 1;

FIG. 46 is a flowchart showing a subroutine of APS control in CPU1.

FIG. 47 is a flowchart showing a document stop position processing subroutine in the CPU 1;

FIG. 48 is a flowchart showing a main routine of the CPU 2 for controlling the ADF.

FIG. 49 is a flowchart showing a subroutine of interrupt processing in the CPU 2;

FIG. 50 is a flowchart showing a subroutine for initialization in the CPU 2;

FIG. 51 is a flowchart showing a home check subroutine of FIG. 50;

FIG. 52 is a flowchart showing a subroutine for opening / closing check in the CPU 2;

FIG. 53 is a flowchart showing a subroutine for a forget-to-take check in FIG. 52;

FIG. 54 is a flowchart showing a speed setting subroutine in the CPU 2;

FIG. 55 is a flowchart showing a speed setting subroutine following FIG. 54;

FIG. 56 is a view showing the relationship between time and pulse speed indicating pulse control of the main motor.

FIG. 57 is a flowchart showing a subroutine for document exchange in the CPU 2;

FIG. 58 is a flowchart showing a subroutine of a start check in the CPU 2;

FIG. 59 is a flowchart showing a subroutine for setting the feed amount in FIG. 58;

FIG. 60 is a flowchart showing a paper feed subroutine in the CPU 2;

FIG. 61 is a flowchart showing a paper feed subroutine continued from FIG. 60;

FIG. 62 is a flowchart showing a paper feed subroutine continued from FIG. 60;

FIG. 63 is a flowchart showing a paper feed subroutine continued from FIG. 60;

FIG. 64 is a circuit diagram of a main motor (stepping motor).

FIG. 65 is a time chart showing control of a main motor (stepping motor).

FIG. 66 is a flowchart showing a paper feed subroutine continued from FIG. 60;

FIG. 67 is a flowchart showing a pre-step set subroutine in the CPU 2;

FIG. 68 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

FIG. 69 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

70 is a flowchart showing a subroutine of size detection 2 in FIG. 69.

FIG. 71 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

FIG. 72 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

FIG. 73 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

FIG. 74 is a flowchart showing a sub-step of a pre-step set following FIGS. 67 and 73;

FIG. 75 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

FIG. 76 is a flowchart showing a sub-step of a pre-step set following FIG. 67;

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

FIG. 78 is a flowchart showing a main motor control subroutine in a pre-step set.

FIG. 79 is a flowchart showing a 2-in-1 set subroutine in the CPU 2;

FIG. 80 is a flowchart showing a 2-in-1 set subroutine following FIG. 79;

FIG. 81 is a flowchart showing a subroutine of 2-in-1 set following FIG. 79;

FIG. 82 is a flowchart showing a 2-in-1 set subroutine continued from FIG. 79;

FIG. 83 is a flowchart showing a 2-in-1 set subroutine continued from FIG. 79;

FIG. 84 is a flowchart showing a 2-in-1 set subroutine following FIG. 79;

FIG. 85 is a flowchart showing a 2-in-1 set subroutine following FIG. 79;

FIG. 86 is a flowchart showing a subroutine of 2-in-1 set following FIG. 79;

FIG. 87 is a flowchart showing a 2-in-1 set subroutine continued from FIG. 79;

FIG. 88 is a flowchart showing a 2-in-1 set subroutine continued from FIG. 79;

FIG. 89 is a flowchart showing a 2-in-1 set subroutine subsequent to FIGS. 79 and 88;

FIG. 90 is a flowchart showing a paper discharge subroutine in the CPU 2;

FIG. 91 is a flowchart showing a paper discharge subroutine continued from FIG. 90;

FIG. 92 is a flowchart illustrating a paper discharge subroutine following FIG. 90;

FIG. 93 is a flowchart showing a paper discharge subroutine following FIG. 90;

FIG. 94 is a flowchart showing a count subroutine in the CPU 2;

FIG. 95 is a flowchart showing a counting subroutine following FIG. 94;

FIG. 96 is a flowchart showing a counting subroutine following FIG. 94;

FIG. 97 is a flowchart showing a count discharge subroutine in the CPU 2;

FIG. 98 is a flowchart showing a size detection subroutine in the CPU 2;

FIG. 99 is a flowchart showing a size detection subroutine following FIG. 98;

FIG. 100 is a flowchart showing a two-sided setting subroutine in the CPU 2;

FIG. 101 is a flowchart showing a subroutine for double-sided setting, following FIG. 100;

FIG. 102 is a flowchart showing a double-sided set subroutine following FIG. 100;

FIG. 103 is a flowchart showing a double-sided set subroutine subsequent to FIG. 100;

FIG. 104 is a flowchart showing a subroutine for double-sided setting, following FIG. 100;

FIG. 105 is a flowchart showing a double-sided set subroutine following FIG. 100;

FIG. 106 is a flowchart showing a duplex setting subroutine following FIGS. 100 and 105;

FIG. 107 is a flowchart showing a subroutine for double-sided setting, following FIG. 100;

FIG. 108 is a flowchart showing a movement subroutine in the CPU 2;

FIG. 109 is a flowchart showing a subroutine of movement following FIG. 108;

FIG. 110 is a flowchart showing a subroutine of movement following FIG. 108;

FIG. 111 is a flowchart showing a subroutine of movement following FIG. 108;

112 is a flowchart showing a subroutine of movement following FIG. 108;

FIG. 113 is a flowchart showing a subroutine of movement following FIG. 108;

FIG. 114 is a flowchart showing a subroutine of movement following FIG. 108;

FIG. 115 is a flowchart showing a subroutine of tip end stopper control in CPU2.

FIG. 116 is a flowchart showing a subroutine of leading end stopper control following FIG. 115;

FIG. 117 is a flowchart showing a subroutine of tip end stopper control following FIG. 115;

FIG. 118 is a flowchart showing a subroutine of leading end stopper control following FIG. 115;

FIG. 119 is a flowchart showing a subroutine of M6 home detection.

FIG. 120 is a flowchart showing a subroutine of M6 movement.

FIG. 121 is a flowchart showing a subroutine for counting up T1, T2, and T3.

FIG. 122 is a flowchart showing a subroutine of document movement prevention control in CPU2.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 copy machine body 2 document feeder 60 document tray 80 document feeder 81 leading edge regulating plate 82 refeed prevention member 83 pickup roller 84 document pressing plate 85 separation roller 87 intermediate transfer roller 89 registration roller 103 feed pressure variable mechanism 120 Document transport unit 123 Transport belt 125 Scale 140 Document discharge unit 141 Reversing roller 145 Discharge roller 170 Document control unit 171 Document discharge stopper mechanism 174 Stopper 240 Document movement prevention unit 246 Document pressing lever 270 Document re-feed moving unit 274 Resupply Paper lever

Claims (6)

[Claims] An original tray is provided to connect a paper feed port and a discharge port in the vicinity of a continuous surface. Documents placed on the document tray are fed one by one from the paper feed port and conveyed to a predetermined position. After doing
In the circulating document feeder that discharges the document from the discharge position to the paper feed port and re-feeds the paper after the document is discharged from the discharge port onto the document tray and all the documents are discharged, the document is placed below the document tray. It is slidably provided on a rail provided parallel to the transport direction, protrudes above the document tray from the groove provided in the document tray, and can move toward the paper feed port from the home position located below the paper discharge port. A refeed lever provided, a discharge sensor for detecting a document discharged to a document tray, and a paper feed empty sensor for detecting a document moved to a paper feed port, wherein the discharge sensor is turned on, and When the paper-supply empty sensor is turned off, the re-feed lever is moved by a predetermined amount according to the document size, and when the paper-supply empty sensor is turned on, the re-feed lever is stopped and returned to the home position. Circulation type document transport device. 2. The recirculating original according to claim 1, wherein after the discharge operation of all the originals is completed, the original is moved by a predetermined amount by the refeed lever and moved to the center of the original tray. Transport device. 3. When a paper ejection sensor is turned on while the original is being moved by the re-feed lever or while the original is returning to the home position,
2. The recirculating document feeder according to claim 1, wherein the return operation of the refeed lever is stopped. 4. The apparatus according to claim 1, wherein the sheet re-feeding lever is moved by a predetermined amount according to the size of the document, and when the sheet empty sensor is not turned on, the re-feed lever is further moved by a predetermined amount. 2. The recirculating document feeder according to 1. 5. The paper feed empty sensor does not turn on even if the re-feed lever is moved by a predetermined amount according to the document size, and the paper feed empty sensor is moved even if it is further moved by a predetermined amount. 2. The recirculating document feeder according to claim 1, wherein when the switch is not turned on, the movement of the refeed lever is stopped. 6. The recirculating document feeder according to claim 1, wherein when the discharge sensor is turned off before the refeeding lever is moved, the refeeding member is prohibited from moving.