JPH0688681B2 - Document circulation device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a document circulation system in which a document is separately fed from an original placing table to an exposure position for each sheet, and after the exposure is completed, the original is discharged from the exposing position and returned to the original placing table. Regarding the device.

2. Description of the Related Art Conventionally, a bundle of documents to be fed is placed on a document placing table, and the lowermost sheet of the document bundle is sequentially separated one by one by a friction separating means provided on the feeding end side of the document bundle. In a configuration in which the documents fed to the predetermined position above and discharged after the exposure are returned to the document table and stacked on the upper side of the document stack, the documents are placed on the document stack before being fed. (1) A partition arm for detecting circulation is placed, and the documents that are sequentially ejected are stacked on the partition arm.When the last document is fed, the partition arm falls by its own weight, and the position where it falls There is known a document circulation device capable of detecting one circulation of a document by a signal from a means for detecting the.

Such a document circulating device is configured to drive a partition arm by a motor in order to place the hanging partition arm on the document stack before starting feeding of the document. If the driving force of the motor is cut off before reaching the upper surface of the stack, the partition arm becomes rotatable and may hit the upper surface of the original stack and bounce back to the hanging position.

Further, when a specified number of document bundles are placed on such a document circulation device, the partition arm bounces as described above because the bundle of document bundles is too thick,
The weight of the original stack is too heavy, causing poor document separation.
Occasionally, multiple documents were fed or documents were not fed.

In addition, even when a document bundle having an apparent document bundle thickness that is too thick due to a gap between the documents even if the document circulation device does not exceed the specified number, The bounce of the partition arm may occur.

It is an object of the present invention to detect an accurate bundle thickness of a document bundle and prevent the rebound of the partitioning unit by surely placing a partitioning unit for detecting one circulation of the document bundle on the document bundle. An object of the present invention is to provide a document circulating device that enables the document feeding and improves the reliability of document feeding.

Example A specific description will be given below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an example of a double-sided document circulating device according to the present invention.

Reference numeral 1 is a document placing table, 2 is a paper feed belt drive shaft, and 2a is a paper feed belt driven shaft, between which a paper feed belt 3 is hung, and is rotating in the direction of arrow C in the figure. Reference numeral 4 is a separation belt drive shaft, and 4a is a separation belt driven shaft, on which a separation belt 5 is attached, and it rotates in the direction of arrow D in the figure.
Further, 2b is a half-moon roller which rotates in the direction of arrow E in the figure. Paper feed belt 3, separation belt 5 and half-moon roller
By 2b, a plurality of sheet-shaped stacked originals placed on the original placing table 1 are separated one by one from the lowermost portion. Reference numeral 6 is a conveying roller, and 6a and 6b are rollers which are in pressure contact with the conveying roller 6, respectively. Also, 9, 10, 11 are conveying rollers, and 9a, 10a, 11a are rollers which are in pressure contact with the conveying rollers 9, 10, 11, respectively. Also, 7
Is the platen glass 12 provided on the top plate of the main body of the copying machine.
The conveyor belt driving roller 7a is located near the left side of the platen, and the conveyor belt driven roller 7a is located near the right side of the platen glass 12, and the belt 8 is placed between them.

The lower surface of the suspension belt 8 is in close proximity to or in contact with the upper surface of the platen glass 12. Further, reference numerals 13 to 17 are reflection type optical sensors arranged at required places of the document circulation path (paper path) to detect the leading edge or trailing edge of the document. Also, 20
Is an opposite type optical sensor ES, 19 for detecting a document placed on the document table 1, a reflection type sensor (recycle sensor) RS for detecting one circulation of the document stack, and the partition arm 22 is a recycle motor 21. The document is stopped on the stack of documents by turning on the recycle sensors RS and 19 at that point, and then the document is fed separately from the bottom document and the trailing edge of the final document is the partition arm.
After exiting 22, the partition arm 22 is a recycle sensor due to its own weight.
It is a mechanism that turns off the position of RS, 19.

FIG. 2 is a schematic cross-sectional rear view showing the drive unit. In the figure, 80 is a motor M2, 81 is a motor gear, and a gear 96 is attached to the paper feed belt drive shaft 2, the separation belt drive shaft 4 and the half moon roller 2b.
Drive force is transmitted through. Reference numeral 82 is a motor M1, 83 is a motor pulley, and 86 is a two-stage pulley, which transmits the drive of the belt 88 from the belt 87. Further, 89 is also a two-stage pulley, which is integrated, and transmits the driving force from the belt 88 to the belt 90, whereby the driving force is always transmitted to the driving roller 7 of the conveyor belt 8 through the pulley 91. Further, 93 is a disk having a notch groove 94 that is integrally rotated with the two-stage pulley 89, and the amount of movement of the belt 8 can be detected by the photoelectric sensor 95. Reference numeral 92 is an electromagnetic brake BK, which enables the belt 8 to be stopped instantaneously when turned on.

Further, 97 is a motor M3, 98 is a gear, 99 is a pulley, 100, 101, 10
Reference numeral 2 is a belt, which transmits the driving force to the conveying rollers 6, 9, 10, 11. Further, 103 is a disk having a notch groove 104 which is integrally rotated with the pulley 99, and the conveying rollers 6, 9, 10,
It is possible to detect the rotation amount of 11, that is, the transport movement amount of the document. Further, numeral 23 is a switching claw, and a tension spring 24 and a solenoid are used to switch whether the original on the platen glass 12 is conveyed by the fulcrum 106 toward the conveying roller 6 or from the conveying roller 9 toward the platen glass. This is done by SL, 107.

Next, the operation of the double-sided document circulating device will be described.

(I) Single-sided original copy In FIG. 1, a plurality of sheet-shaped single-sided originals arranged in page order are placed on the original placing table 1 with the first page facing upward.
The placed document is 1 by the paper feed belt 3 and the separation belt 5.
The originals fed separately from the lowermost one by one pass through the paper path Ia and are delivered by the conveyor belt 8 onto the platen glass 12 with the image surface of the originals facing downward. When the rear end of the document is detected by the sensors S2, 14, the counting of the number of the cutout grooves 94 of the disc 93 (FIG. 2) is started from that point, and the motors M1, 82 are turned on after counting a predetermined count. The electromagnetic brakes BK, 92 are turned off and the conveyor belt 8 is instantaneously stopped from rotating. This will cause the original to
The positioning set state is automatically set at a predetermined position on the surface.

When the original is positioned on the platen glass 12 in this manner, the copying operation is started and one exposure scan is performed.
The copied copy paper is stored in a paper discharge tray (not shown). After the exposure of the original, the Frenoid SL107 is turned on, the switching claw 23 is in the state of the broken line, and the exposed original is the paper path III.
It is discharged through a and IVa. At the same time, the next original is fed in parallel by the above-mentioned operation and positioned and set on the platen glass 12.

This parallel operation is simply an operation of circulating the original document, and since the reverse of the original document is not performed for the previous original document and the next original document, it is referred to as a normal discharge normal feeding operation. Then, the normal feeding and normal feeding operation is sequentially performed, and one circulation of the set originals is detected by the recycle sensor RS, 19, and the end of the circulation is sent to the copying machine main body to count the number of copies. The above operation is repeated until the set number of copies is reached, and the required number of copies are stored in the discharge tray (not shown) of the copying machine.

(Ii) Double-sided original copy If the number of originals on the original placing table 1 is three, the originals placed on the original placing table 1 are in the page order as shown in FIG. 3, and the originals are placed after copying. Also becomes the same as the first set as shown in FIG. These operations will be described.

First, the 5th and 6th page originals are conveyed to the platen glass 12, then the motors M1 and 82 rotate in the reverse direction, M3 and 97 (Fig. 2) rotate in the forward direction, and at the same time, the solenoids SL and 107 are turned on, thereby switching claws. 23 is in a broken line state, and the document passes through the paper paths IIIa and IVa and is gripped by the transport rollers 6, 6a, 10, 10a, 11 and 11a and transported. If the sensor S3,15 detects the trailing edge of the document,
The motor M3,97 is stopped. After a lapse of a certain time, the motors M3 and 97 are reversely rotated, and the original document is conveyed by the conveyance rollers 9 and 9a through the paper paths Va and VIa. If the sensors S4,16 detect the trailing edge of the document, the motors M3,97 are stopped,
After a lapse of a certain time, the motors M3 and 97 are normally rotated again, and the motors M1 and 82 are normally rotated so that the solenoids SL and 107 are turned off and the document passes through the paper path VIIa and is gripped by the belt 8 and conveyed.
Then, when the rear end of the document is detected by the sensors S5 and 17,
From that point on, the number of the cutout grooves 94 of the disc 93 (Fig. 2) starts to be counted, and after counting a predetermined number of counts, the motors M1, 82 turn off, the electromagnetic brakes BK, 92 turn on, and the conveyor belt The rotation drive of 8 is instantly stopped and the document is set. As described above, the sheet feeding operation in which the original on the original placing table 1 is inverted and set on the platen glass 12, that is, the reverse sheet feeding operation (hereinafter referred to as the anti-feed operation) is first performed.

Then, the copying machine main body starts the copying operation of the sixth page of the original,
Starting one exposure scan, the copied copy paper is stored in a paper discharge tray (not shown). After the exposure of the original, the exposed original of the sixth page passes through the paper paths IIIa, IVa, Va, VIa, and VIIa in order to set the fifth page of the original downward on the platen glass 12. (This operation is hereinafter referred to as a pulling repetition operation).

After that, the copier body starts copying the fifth page of the original,
Store the copy paper in the output tray (not shown).

After the exposure of the original on the fifth page, the original on the platen glass 12 passes through the paper paths IIIa and IVa, and the fifth page faces upward on the original placed on the original table 1 by the transport rollers 11 and 11a. And is discharged (this operation is hereinafter referred to as normal discharge operation). From a certain time during the normal discharging operation, the above-described anti-feeding operation of the next original having the fourth and third pages is performed in parallel with the normal discharging operation, and the fourth page is turned downward on the platen glass 12. The positioning is set (the operation of performing the normal discharging operation and the anti-charging operation in parallel is hereinafter referred to as the normal discharging / anti-charging operation). After that, the above-described copying operation is performed a necessary number of times, and finally, the copy sheets are arranged in the page order and stored in a discharge tray (not shown).
The original is also discharged to the original placing table 1 without changing the initial set state as shown in FIG. 3, and copying from the double-sided original is completed.

FIG. 4 is a schematic control circuit diagram for performing the above-described sequence operation.

In FIG. 4, a well-known one-chip microcomputer (hereinafter referred to as a microcomputer) 120 having a built-in ROM, RAM, etc. is mainly configured, and input ports I _{1 to} I of the microcomputer 120 are arranged.
Each sensor signal is input to ₇ , and the transfer clock and sensor BC output from the sensor 105 to the interrupt terminals iNT1 and iNT2,
The belt clock signal output from 95 is input.

On the other hand, the drivers D _{1 to} D are connected to the output ports O _{1 to} O ₈ of the microcomputer 120.
₈ are connected and each load can be driven through the drivers D _{1 to} D ₈ . From the output ports O ₄ and O ₅ , M3FWD and M3REV are output so that the transport motors M3 and 97 can be rotated in the forward and reverse directions, respectively, and are rotated in the directions of arrow → and in FIG. In addition, the output ports O ₂ and O ₃ are M1FWD and M1R so that the belt drive motors M1 and 82 can rotate forward and backward.
EV is output and is configured to rotate in the directions of arrow → and in FIG. 1, respectively.

In particular, the output port O ₁ drives the recycle motor RM via the driver D ₁ .

Further, the I / O terminal of the microcomputer 120 is connected to the main body of the copying machine to send and receive the above-mentioned copying operation start signal, original exposure end signal, original circulation end signal, etc. to operate the double-sided original circulating device and the main body of the copying machine. Execute the matching. Reading these input signals or turning the load on and off is
It is controlled according to the program stored in OM.

Next, the operation of the double-sided document circulating device (hereinafter referred to as RDF) of the present invention will be described using the general flow chart of FIGS. 5 and 6 and the detail flow chart of FIGS. 7 to 9.

FIG. 5 is a general flow chart for a single-sided original copy operation, and FIG. 6 is a general flow chart for a double-sided original copy operation. In the single-sided original copy operation shown in FIG. 5, the partition arm check SUB (step φ), which will be described later, is executed first, and then the partition arm 22 is stopped at the upper part of the original stack and then the normal feed (SUB (step 100)) is executed to execute the original placement. One document is separated from the document stack placed on the table 1 and fed, and the document is passed through the transport paths Ia to IIa (FIG. 1) and stopped at a predetermined position on the platen glass 12 of the copying machine. Then, a copying operation start signal is sent to the main body of the copying machine, and the copying machine starts the copying operation and starts exposure, while the RDF executes the cycle end SUB to detect one circulation of the document bundle (step 500). Standby until the exposure of the main body (step 200) At the end of the exposure, the normal discharge SUB (step 300) described later is executed, and the original document on the platen glass 12 passes through the transport paths IIa to IIIa to IVa and is placed on the original document table 1 again. It is placed on the upper side of the partition arm 22 on the original stack. Repeat the operation, cycle end SUB (ste
In p500), when the partition arm 22 falls from the original due to its own weight, it informs the copying machine that one cycle of the original has ended, and the operation ends, and as a result, a set of copy sets is completed in the output tray of the copying machine. .

On the other hand, in the double-sided document copying operation shown in FIG. It passes through IVa-Va-VIa-VIIa-IIa and is stopped at a predetermined position on the platen glass 12. At this time, the original is placed so that the back surface of the original placed on the original placing table 1 is on the platen glass 12 side, and in step 200, the copying machine main body instructs the back surface of the original to be copied. Next, at the end of the exposure of the copying operation, the pulling repeat SUB (step 400) is executed again to pass the originals through the conveyance paths IIa to IIIa to IVa to Va to VIa to VIIa to IIa, and stop at a predetermined position on the platen glass 12 again.
This time, the original is placed so that the surface of the original is on the platen glass 12 side, and in step 200 the copying machine body is instructed to perform the original surface copy operation of the original, and the cycle end SUB is executed to detect one circulation of the original bundle. (Step 500) At the end of the exposure of this copying operation, the normal discharge SUB (step 300) is executed, and the original is returned to the upper side of the partition arm 22 of the original placing table 1 in the same set state as before the original is circulated on both sides. After that, this operation is repeated, and a set of copy sets is completed by the end of one cycle described above.

Next, the operation executed by each SUB will be described in detail.
In FIG. 7, the normal feed SUB is executed by first turning on the separation motor M2, 80 to separate one document from the lower side of the document stack placed on the document mounting table 1 and turning on the conveyance rollers 6, 6a. Wait until the leading edge of the original arrives at the paper feed sensor S1, 13 arranged upstream (step 101). The feeding motor M3, 97FWD to feed the original separated at the leading edge to the feeding path Ia by the feeding rollers 6, 6a.
Turn on and rotate the transport rollers 6, 6a in the direction of the solid arrow,
It waits until the leading edge of the document arrives at the paper feed sensor S2, 14 between the conveyance rollers 6, 6a and the belt roller 7 (step10
2). Separation motor M prevents the second document from being continuously separated even if the original was normally fed into the transport path when the leading edge arrived.
2,80 is turned off, the belt drive motor M1FWD, 82 is turned on to further feed to the conveyance path IIa, the belt roller 7 is rotated in the direction of arrow →, and the leading edge of the document is fed into the belt 8. It waits until the above-mentioned paper feed sensors S2, 14 detect the trailing edge of the document (step 103). Feed sensor S
When detected by 2, 14, start the registration counter [RGCNI] operated by the clock of the photoelectric sensors BC, 95 to stop the original at a predetermined position on the platen glass 12,
Each time the above-mentioned photoelectric sensors BC and 95 are input by one clock, [RGCNI] is counted, and the process waits until [RGCNI] ends (step 104). Assuming that the original has arrived near the predetermined position on the platen glass 12 at the end of [RGCNI], the electromagnetic brakes BK and 92 are turned on and at the same time the belt drive motor M1FWD and 82
When turned off, the belt drive is instantly stopped and the document can be accurately positioned. In addition, the drive of the transport motor M3,97 is also M3,97
The FWD is stopped, the switching solenoid SL107 is turned on, and the conveyance path to the paper discharge path IIIa is switched.

This operation surely stops one original at a predetermined position on the platen glass 12.

On the other hand, in FIG. 8, the flip SUB is executed by first turning on the switching solenoids SL and 107 to lower the switching pawls 23 to switch the conveyance path in order to feed the document on the platen glass 12 into the conveyance paths IIIa to IVa. The belt drive motor M1REV, 82 is turned on in order to rotate 7 in the direction of the dotted arrow, and the carry motors M3,97 are turned on in order to rotate the carry rollers 6,6a in the direction of the arrow, that is, M3FWD is turned on. Documents are conveyed
In the state of entering from IIIa to IVa, the paper is continuously conveyed until the paper discharge sensor S3, 15 detects the trailing edge of the document (step 401). M1REV, 82 OFF, M3FWD, 97 OFF in order to turn off the belt drive motors M1,82 and transport motors M3,97 by measuring the paper discharge timer from the time when the trailing edge is detected until the trailing edge of the document comes out of the transport path IIIa. Then
The document is supported by the transport rollers 10, 10a and 11, 11a, and its rear end is positioned near the transport rollers 10, 10a, and is stopped while the standby interval timer is being timed (step 40
2). Next, the conveyance motors M3 and 97 are turned on, that is, M, in order to rotate the conveyance rollers 9, 9a and 10, 10a, 11 and 11a in the direction of the dotted line arrow in order to reverse the conveyance direction of the document and feed it to the conveyance paths Va to VIa.
3REV, 97 is turned on, and the document continues to be fed until the reversal sensor S4, 16 detects the trailing edge of the document in the state where the document enters from the transport path Va to VIa (step 403). M3REV, 97 is turned off in order to turn off the conveyance motors M3,97 by measuring the reversal timer from the time when the trailing edge is detected until the trailing edge of the document comes out of the conveyance path Va, and the document is conveyed by rollers 10,10a, 11,11a. Supported by the reverse end of the reverse sensor S
It is located between 5,17 and the transport rollers 10,10a, and is stopped while the interval timer is counting (step40
Four).

Next, the document transport direction is reversed again and the transport paths VIa-VIIa-I
In order to rotate the conveyor rollers 9 and 9a in the direction of arrow → in order to feed them to Ia, the conveyor motor M3, 97 is turned on, that is, M3EWD is turned on, and further the belt drive motor M1FWD, 82 is rotated to rotate the belt roller in the direction of arrow →. And the switching solenoid
The SL107 is turned off, the switching claw 23 is lifted, and the transport path is switched. The front end of the document is fed into the belt 8 and stands by until the rear end is detected by the reversing sensors S5, 17 in the conveyance path VIIa (step 405).

When the trailing edge is detected, the resist counter [RGCN2] is started in order to stop the document at a predetermined position on the platen glass 12, and the photoelectric sensor 95 is driven by a clock pulse [RGCN
Time is counted until step 2) ends (step 406). [RGCN2] At the end, it is assumed that the document has arrived near the predetermined position on the platen glass 12, the electromagnetic brakes BK, 92 are turned on, and at the same time, the belt drive motor M1FWD, 82 is turned off, and the driving of the belt 8 is instantaneously stopped. Accurate document positioning is possible. The driving of the transport motors M3, 97 is also stopped by turning off M3REV, 97, and the switching solenoids SL, 107 are turned off. By this operation, the front and back of the original document are surely turned over and stopped at a predetermined position on the platen glass 12.

In FIG. 9, the normal discharge SUB is executed by turning on the belt drive motor M1REV, 82 in order to rotate the belt roller 7 in the direction of the arrow in order to feed the document on the platen glass 12 to the transport paths IIIa to IVa. Furthermore, transport rollers 6,6b, 10,10a, 1
Transport motor M3,97 to rotate 1,11a in the direction of arrow →
Is turned on, that is, M3FWD is turned on, and solenoids SL, 107 are turned on. With the document in the transport path IVa, the paper ejection sensor S3,
The process waits until 15 detects the trailing edge of the document (step 301). When the trailing edge is detected, the paper discharge counter [EJCN] is started [EJCN]
The clock output of the photoelectric sensor 105 is counted until the end of
tep302). At the end of [EJCN], the originals pass through the transport rollers 11, 11a and are returned to the upper side of the original stack on the original placing table 1. M3, 97FWD OFF M1REV, 82 OFF switching solenoid SL
When 107 is turned off, driving is stopped and paper ejection is completed (step30
3).

10-1 to 10-4 are front views showing a recycle counting device. Further, FIGS. 11 to 12 are detailed flow charts of the partition arm check SUB and the cycle end SUB which operate the recycle counting device. The recycle count will be described using these.

In FIG. 10-1, reference numeral 21 is a recycle motor which is fixed to the side wall 1a of the document placing table 1 with the axis 25 parallel to the moving direction of the document and is a DC motor. A lever pin 27 is fixed to a boss 26 fixed to the motor shaft 25. The partition arm 22 is slid on the motor shaft 25 and
27 are engaged. A cutout 28 for allowing the partition arm 22 to rotate is provided in the document placing table 1 and a part of the side wall 1a thereof. Further, in conjunction with the partition arm 22, a disc 29, which is partially cut away, is provided, and the cutout portion turns on / off the recycle sensor RS19.

If there is no document on the document table 1 as shown in Fig. 10-2,
The partition arm is located at a position 22 'indicated by a chain double-dashed line in the figure, and the recycle sensor 19 is turned on. As described above, when RDF starts operating, the partition arm check SUB is first executed. In FIG. 11, the partition arm check SUB first checks whether the partition arm is in the above-mentioned position 22 ′ to turn on the recycle sensor 19 and drives the recycle motor 21 to start rotating in the direction of the arrow in FIG. 10-1. , The lever pin 27 fixed on the shaft 25 of the recycle motor 21 also starts to rotate in the direction of the arrow and engages with the partition arm 22 to partition the arm.
22 also rotates in the direction of the arrow and is placed on the top of the original.

The drive time [motor-on timer] of the recycle motor 21 starts at the same time as the drive of the recycle motor 21, and after a certain time, the drive of the recycle motor 21 is turned off at the end of the timer (step 001). Here, the [motor-on timer] is set so that the partition arm 22 is driven for a fixed time longer than the rotation (1 rotation) time required to be placed on the original, and therefore the partition arm 22 is driven. The partition arm 22 is always in close contact with the document because it collides with the document, bounces, and is pressed against the uppermost part of the document to be driven for the time required to stand still.

At this time, the partition arm 22 has a thickness of l as shown in FIG. 10-1.
In the state where the rotation is stopped on the document stack, the notch portion of the notch disc 29 is located at the position of the recycle sensor RS19, the recycle sensor RS19 is detected to be off, and it is determined that the partition arm 22 is normally set. , [Document counter] described later is cleared, and the process proceeds to the next step (step 002). However, the first
As shown in FIG. 0-3, when the operator puts a bundle of originals on the original placing table 1 more than the specified number, the thickness L of the originals becomes L> l,
The partition arm 22 also stops at a high position. Along with that, the cutout part of the cutout disk 29 is a recycle sensor RS19.
The recycle sensor RS19 is detected to remain in the ON state, and at that time, it is determined that the number of originals is equal to or more than the specified number, and the process proceeds to JAMSUB described later to stop the operation of RDF (step00
3).

This step 003 can detect when the partition arm 22 does not rotate due to a defect in the recycle motor or does not turn on / off due to a defect in the recycle sensor.
The operation of F can be stopped.

Further, as shown in FIG. 10-4, the operator places the original stack on the original placing table 1
If the document is not placed at a position in contact with the side wall 1a when placed on, the set position of the document is defective. At this time, the above step
In 001, the [motor-on timer] is used to drive the partition arm 22 for a fixed time longer than the rotation time required to place it on the document, so in the state of FIG. So, the recycle sensor RS19 can detect ON / OFF more than twice during motor rotation,
In that case, the operation of the RDF is stopped because the set position of the document is defective (step004).

Next, after the document is stopped at a predetermined position on the platen glass 12, the cycle end SUB is executed. This is executed before the originals are stopped one by one on the platen glass. In FIG. 12, the counter for the number of originals is incremented by +1 and, further, it is checked whether the content of the counter is the specified number of the originals, If it is determined that the number is greater than or equal to the number, the process proceeds to the JAM SUB described later and the RDF operation is stopped (step 501). As will be described later, for example, in a state in which the partition arm 22 should hang down by its own weight, even if a defect that it does not hang down for some reason occurs, it is possible to prevent the RDF from continuing to operate up to a specified number. . As the copying operation progresses, the originals after the copying are sequentially stacked on the uppermost portion of the original, that is, on the upper side of the partition arm 22. Initially, when the original document at the top is fed onto the platen glass 12, the circulation of the original document is completed, and there is no document under the partition arm 22. After passing through, it rotates in the direction of the arrow in Fig. 10-2 due to its own weight and stands still at position 22 'in the figure. At that time, the recycle sensor RS, 19 detects the partition arm 22 to copy the one circulation end signal. Output to the machine (step502). This ensures the operation of the recycle counting device. The JAM SUB will be described in FIG. 13 in order to stop the above RDF operation.

First, the recycle motor RM, the belt drive motor M1, the separation motor M2, the conveyance motor M3, the brake BK, and the switching solenoid SL are all turned off and the operation is stopped (step 601).
Next, check whether the sensors S1, S2, S3, S4, S5 on the paper path are all off. Check if the operator has removed all the originals on the paper path. Then, if the (ES) sensor is off, the operator sets the original stack. You can check to see if it has been removed from the document table and then release it from the JAM state (step60
2).

Effect As described above, according to the present invention, by rotating the drive means for a time longer than the time required to be placed on the upper surface of the original stack from the state where the partition means is falling by its own weight, the original stack is rotated. After the partitioning means is placed on the upper surface of the document stack so as to suppress the rebounding of the partitioning means above, the rotation drive of the driving means is stopped, and the rotation angle of the partitioning means detected by the detecting means is outside the predetermined range. In this case, when the operation of the document conveying means is prohibited and the rotation angle of the partitioning means detected by the detecting means is within a predetermined range, the operation of the document conveying means is started, the partitioning means falls by its own weight, and the detecting means detects it. When the detected rotation angle of the partitioning means is out of the predetermined range, the operation of the document conveying means is terminated, so that the partitioning means serves to detect one circulation of the document bundle and the bundle thickness of the document bundle. The document feeding control and the document feeding failure can be performed with a simple structure, and the bounce of the partitioning means on the document stack can be suppressed to reduce the stack thickness of the document stack. With accurate detection and good document feeding control, it is possible to prevent document multi-feeding and document non-feeding due to poor document separation, and a highly reliable document feeding control with a simple configuration. It can be performed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a document circulating device according to the present invention, FIG. 2 is a rear view of a section showing a driving part of the document circulating device, FIG. 3 is a diagram showing a placed state of a document, and FIG. 4 is a document. Block diagrams showing the control unit of the circulation device, FIGS. 5 and 6 are general flow charts showing the control flow of the document circulation device, FIGS. 7 to 9 and 11 to 13 are shown in FIG. Fig. 10 and Fig. 10-4 are detail flow charts showing the details of Fig. 6 and Fig. 6 showing a recycle counting device. In the figure, 1 is a document table, 3 is a paper feed belt, 5 is a separation belt, 8 is a suspension belt, 13 to 17 and 20 are sensors, 19 is a recycle sensor, 21 is a recycle motor, 22 is a partition arm, and 120 Is a microcomputer.

Claims (1)

[Claims] 1. An original placing means for placing a bundle of originals, the originals being separated and fed sheet by sheet from the original placing means to an exposure position, and the originals being discharged from the exposure position after the exposure is completed. An original conveying means for returning to the placing means, provided on the original placing means, and rotating around an axis parallel to an upper surface of an original placed on the original placing means,
One cycle of a stack of original documents is detected, which is placed on the upper surface of the original document stack placed on the original document placing means to separate the original document before exposure from the original document after exposure, and falls down by its own weight when the lower original document disappears. Partitioning means for driving the partitioning means, driving means for rotationally driving the partitioning means so as to place the partitioning means on the upper surface of the document stack placed on the document placing means, detecting means for detecting a rotation angle of the partitioning means, the partitioning means The bounce of the partitioning means on the document stack is suppressed by rotationally driving the driving means for a time longer than the time required to place the means on the upper surface of the document stack from the state in which the means is dropping by its own weight. When the partition means is placed on the upper surface of the original stack as described above, the rotation drive of the drive means is stopped, and when the rotation angle of the partition means detected by the detection means is outside the predetermined range, the original When the operation of the conveying means is prohibited and the rotation angle of the partitioning means detected by the detecting means is within the predetermined range, the operation of the document conveying means is started, and the partitioning means falls by its own weight and A document circulation device, comprising: a control unit that terminates the operation of the document conveyance unit when the rotation angle of the partition unit detected by the detection unit falls outside the predetermined range.