JPH0581891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a document feeding device that feeds a document to a predetermined position.

2. Description of the Related Art Generally, a device that automatically feeds a document is sometimes used in combination with an image forming device such as a copying machine.

An example of this type of device is one that allows copying of double-sided originals;
Double-sided copying makes the operation complicated, especially the signal exchange between the copier itself and this type of additional device, which increases the number of signal lines.
The drawbacks were that the configuration became complicated and reliability decreased. Furthermore, when a specification change occurs on the copying machine main body side, the specification change etc. must be made on the additional device side as well.

Furthermore, if the configuration was simplified, there was a drawback that various modes such as double-sided copying from a double-sided original, double-sided copying from a single-sided original, etc. could not be selected.

In addition, if the document feed/eject mode is determined in advance according to the selected copy mode, the document eject/feed mode will be changed for recovery processing when copying is resumed in the event of a jam in the document or copy paper. The selection becomes very complicated, and in addition to the normal document feed/eject mode, it is necessary to have multiple document feed/eject modes for recovery processing depending on the timing of jam occurrence, making control complicated. .

Purpose The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a document feeding device capable of performing a complicated document feeding operation with a simple configuration.

That is, the present invention provides an original feeding device connectable to an exposure device that exposes originals, which includes a stacking section for stacking originals, and a first transport path for transporting the originals stacked on the stacking section one by one. a conveying means for feeding the original to the exposure position of the exposure device and then ejecting the original at the exposure position to the stacking section via a second conveying path; and a reversing means for reversing the front and back of the original conveyed by the conveying means. a first feeding mode in which the document in the stacking section is reversed from front to back by the reversing means and then fed to the exposure position; and the document in the stacking section is fed to the exposure position without being reversed from front to back. Second
a first discharge mode in which the original at the exposure position is reversed front to back by the reversing means and then discharged to the stacking section; and a first discharge mode in which the document at the exposure position is discharged to the stacking section without being reversed front to back. and a second ejection mode, and the conveying means and the reversing mode are set in one of the first and second feeding modes and one of the first and second ejection modes. a control means for controlling the operation of the means;
input means for inputting a mode selection signal for selecting a feeding mode and an ejection mode output from the exposure position, and the control means is configured to: determining a discharge mode based on a mode selection signal input to the input means, and determining a feeding mode for the next document before starting the discharge operation of the document at the exposure position;
It is an object of the present invention to provide an original document feeding device that performs an operation of ejecting an original at an exposure position and an operation of feeding the next original in parallel according to a determined ejection mode and feeding mode.

Embodiments A detailed description will be given below based on the drawings. 1st-
FIG. 1 is a longitudinal sectional front view showing a schematic configuration of an example of a double-sided copying apparatus according to the present invention.

The copying apparatus of this example is broadly divided into a double-sided original circulating device A, a copying machine main body B containing copying process equipment, and a sorter C for sorting copy paper. It is located on the top plate of the machine casing.

(1) Double-sided document circulation device A 1 is the document placement table, 2 is the paper feed belt drive shaft, 2
A is a paper feed belt driven shaft, between which the paper feed belt 3 is placed and rotates in the direction of arrow C in the figure. 4 is a separation belt drive shaft, 4a is a separation belt driven shaft, and a separation belt 5 is placed between them and rotates in the direction of arrow D in the figure. A plurality of sheet-shaped originals placed on the original placing table 1 are separated one by one from the bottom by a paper feed belt 3 and a separation belt 5. 6 is a conveyance roller, and 6a and 6b are rollers that are in pressure contact with the conveyance roller 6, respectively. Further, 9, 10, and 11 are also conveyance rollers, and 9a, 10a, and 11a are rollers that come into pressure contact with the rollers 9, 10, and 11, respectively.
Further, 7a is a conveyor belt drive roller located near the left side of the platen glass 12 disposed on the top plate of the main housing of the copying machine, and 7a is the platen glass 12.
A conveyor belt driven roller is located near the right side of the conveyor belt, and a belt 8 is placed between the conveyor belt driven rollers. The lower surface of this suspension belt 8 faces or contacts the upper surface of the platen glass 12 in close proximity. Also, 13 to 18 are document circulation paths (paper paths)
This is a reflective optical sensor that detects the leading edge or trailing edge of a document, which is placed at a predetermined location. Further, 20 is a reflective optical sensor ES for detecting the document placed on the document tray 1, 19 is a reflective sensor (recycle sensor) RS for detecting one circulation of the document bundle, and the partition arm 22 is stopped from rotating on the document stack by the pulse motor 21, and at that point, the recycle sensor RS19 is turned on, and the documents are then separated and fed from the bottom document, and when the rear end of the final document passes through the partition arm 22, the partition arm 22 is designed to be turned off by passing through the recycle sensor RS19 due to its own weight.

(2) Copying machine main body B 12 is a platen glass, 30 is a photosensitive drum driven to rotate in the direction of the arrow around the shaft 30a, 3
1 is a charger, 32 is a developer, 33 is a transfer charger, and 34 is a cleaner. 35 is a cassette for storing copy paper; 36 is a paper feed roller that feeds the copy paper one by one from the cassette;
37 and 37a are register rollers, and 38 is a conveyance belt that conveys the copy paper after transfer to fixing devices 39 and 39a. Reference numeral 40 indicates an intermediate tray for storing copy paper after single-sided copying; 41 and 41a indicate a drive shaft and a driven shaft of the paper feed belt 42; and 43 and 4
Reference numeral 3a denotes a driving shaft and a driven shaft of the separation belt 44, which serves as a mechanism for refeeding the copy paper stored in the intermediate tray 40 from below.
Also, 45 and 45a are paper ejection rollers that feed the paper after copying to a sorter C, or, if the sorter C is not connected, eject it to a paper ejection tray 46 as shown in FIGS. 1-2.

(3) Sorter C 60 is a conveyance roller, 60a is a pressure roller,
This is for feeding the copy paper sent out from the copying machine main body B into the bins 61a to 61o.
Reference numeral 62 designates a fixing plate for the bins 61a to 61o, which has a cutout groove 63. The bins 61a to 61o and the fixing plate 62 are integrally formed, and are connected to a chain 64 with a spring 65, and are connected to the shaft of the motor 66. Power is transmitted by fixed rotating rollers 67 and 67a, and the structure is movable up and down. A photoelectric sensor 68 detects the positions of the bins 61a to 61o, and by detecting the notch groove 63, it determines which bin corresponds to the discharge port. Further, 69 is a photoelectric sensor that detects the trailing edge of the copy paper sent from the copying machine main body B. After detecting the trailing edge of the copy paper, it waits until the copy paper is completely stored in the bin, and then removes the copy paper from the bin. When the bottle starts moving and the next notch is detected by the photoelectric sensor 68, the bottle is controlled to stop moving. In this manner, the copy sheets sent from the main body B during copying can be sequentially stored in each bin and sorted.

(4) Drive system of double-sided document circulating device A FIG. 2 is a schematic cross-sectional rear view showing the drive section. In the figure, 80 is a motor M ₂ , and 81 is a motor gear that transmits driving force to the paper feed belt drive shaft 2 and the separation belt drive shaft 4 through a gear 96 . 82 is motor M1, 83 is motor pulley,
86 is a two-stage pulley, from belt 87 to belt 8.
The drive transmission of 8 is performed by electromagnetic clutch CL85.
In addition, 89 is also a two-stage pulley and is integrated.
transmitting the driving force from the belt 88 to the belt 90;
As a result, driving force is constantly transmitted to the drive roller 7 of the conveyor belt 8 through the pulley 91. or,
Reference numeral 93 is a disc having a notched groove 94 which is rotated by a two-stage pulley 89 and an L body, and the amount of movement of the belt 8 can be detected by a photoelectric sensor 95. Reference numeral 92 denotes an electromagnetic brake BK, which, when turned on, makes it possible to stop the belt 8 instantly.

Also, 97 is motor M3, 98 is gear, 99
is a pulley, and 100, 101, and 102 are belts that transmit driving force to the conveyance rollers 6, 9, 10, and 11. Further, 103 is a disc having a notched groove 104 which is rotated together with the pulley 99, and is rotated by a photoelectric sensor 105 to detect the transport rollers 6, 9, 10,
11 can be detected, that is, the amount of conveyance movement of the document can be detected. Also, 23 is a switching claw,
A solenoid SL 107 is used to switch whether the document on the platen glass 12 is to be transported in the direction of the transport roller 6 or the transport roller 9 using the fulcrum 106 .

Next, the operation of the double-sided document circulation device A will be explained.

(i) Single-sided original - single-sided copy (without sorter) In FIG. 1, a plurality of sheet-like single-sided originals with the page order aligned are placed on the original placing table 1 with the first page facing upward. The placed originals are separated and fed one by one from the bottom by the paper feed belt 3 and the separation belt 5, and the fed originals pass through the paper path Ia and are transferred to the platen glass 12 by the conveyor belt 8.
The original is sent out with the image side facing down. When the trailing edge of the document is detected by the sensor 14 (S ₂ ), the disk 93 (second
Start counting the number of notched grooves 94 in the figure), and after counting the predetermined count, turn off motor A182, turn off clutch CL85, and turn off brake BK92.
is turned on, and the rotational drive of the conveyor belt 8 is stopped instantly. This allows the original to be placed on the platen glass 1.
It is automatically positioned and set to a predetermined position on the second surface. Also, sensor 13 (S ₁ ) (1-1
(Figure) detects whether or not the document has been separated normally. If the sensor 13 (S ₁ ) does not detect the document within a certain time after the separation and conveyance starts, it is determined that the document is jammed and the document is not conveyed. Stop.

When the original is positioned on the platen glass 12 in this way, a paper feeding completion signal (described later) is sent.
is sent to the copying machine body B, the copying operation is started,
A toner image corresponding to the image of the original is placed on the photosensitive drum 30.
formed on top. Also, a sheet of copy paper is fed from the cassette 35 by the paper feed roller 36, and after passing through the paper bus Ib, the toner image is transferred onto the upper surface thereof by the charger 33, passing through the paper bus b, and then being transferred to the fixing roller 39. , 39a, and is discharged onto the paper discharge tray 46 through the paper bus b. On the other hand, the exposed originals are transferred to the paper buses a, a after one exposure of the originals by the halogen lamp 46 and the optical mirrors 47a, 47b, 47c, and 47d.
is discharged through the At the same time, the next original is fed in parallel and positioned on the platen glass 12 by the above-described operation.

This parallel operation is simply an operation of circulating the originals, and the reversal of the originals is not performed on the previous or next original during the process, so it is called a normal discharging and normal feeding operation. Then, the sensor RS19 detects one circulation of the set originals by sequentially carrying out the normal feeding, discharging and normal feeding operations, and sends a cycle end signal (described later) to the main body B during copying.
Count the number of copies by 1. The above operation is repeated until the set number of copies is reached, and the output tray 4
The required number of copies are stored on the 6.

(ii) One-sided original - one-sided copy (with sorter) The operation is almost the same as the case of (i) one-sided original - one-sided copy (without sorter) explained in the previous section, but
If there is no sorter C, the normal discharge and normal feeding operation is performed for each exposure of a certain document, whereas if the sorter C is installed, the exposure of a certain document is determined by the set number of copies. The copy paper that is rotated and sequentially discharged is placed in the bin 61 of sorter C.
It is stored while being bin-shifted from a to 61o. In other words, the existence of the sorter C makes it possible to copy a set number of copies by circulating the original once.

(iii) Double-sided original - double-sided copying (without sorter) Assuming that there are three originals on the original tray 1, the pages of the originals placed on the original tray 1 are arranged in the page order as shown in FIG. Temporarily set the desired number of copies to 3.
When copying is completed, the copy sheets are stacked on the paper discharge tray 46 as shown in FIG. 4, and the originals are placed in the same state as when they were initially set as shown in FIG. Explain their operation.
First, the 5th and 6th page originals are conveyed to the top of the platen glass 12, and then the motors M182 and M397
(Fig. 2) is reversed and at the same time the solenoid
By turning on the SL 107, the paper ejection route is switched, and the original is conveyed through the paper buses a, a, gripped by the conveyance rollers 9, 9a. When sensor S517 detects the trailing edge of the document, motor M397 is stopped. Thereafter, after a certain period of time has elapsed, the motor M397 is rotated in the forward direction, and the original passes through the paper buses a, a, and the transport rollers 10, 10a,
11, 11a. and sensor
When S618 detects the trailing edge of the document, motor M397 is stopped, and after a certain period of time the motor M397 is stopped.
M397 is rotated in the reverse direction again, motor M182 is rotated in the normal direction, solenoid SL23 is turned on, and the document passes through the paper bus a, is gripped by the belt 8, and is conveyed. When the trailing edge of the document is detected by the sensor S315, it starts counting the number of notched grooves 94 in the disk 93 (Fig. 2) from that point on, and after counting a predetermined number, the motor M182 is turned off and the clutch CL85 is turned off. is off, brake BK92
is turned on, the rotational drive of the conveyor belt 8 is stopped instantaneously, and the original is set. As described above, the paper feeding operation in which the original on the original platen 1 is set on the platen glass 12 while being inverted, that is, the reversing paper feeding operation (hereinafter referred to as the reverse feeding operation) is first performed. Then, a paper feeding completion signal is sent to the main body B of the copying machine. In the copying machine main body B, the original image is copied onto the copy paper in the same manner as in the above operation, but the fixing roller 39,
The copy paper ejected from 39a is transferred to the switching claw 48.
Since the paper has been switched, the paper passes through the paper bus b and is placed on the intermediate tray 40 as shown in FIG. On the other hand, at the same time as the exposure of the sixth page of the original is completed, a repeating operation is performed to position and set the fifth page of the original downward on the platen glass 12 through paper buses a, a, a, a, a, a. (This operation is hereinafter referred to as a repeat operation). After that, the paper feeding completion signal is sent to the copying machine body B again.
The copying operation for the fifth page is performed, the image of the fifth page is copied onto the back side of the copy paper on which the image of the sixth page of the copy paper placed on the intermediate tray 40 has been copied, and the image of the fifth page is copied onto the back side of the copy paper placed on the intermediate tray 40. Then, the paper is ejected with the image of the fifth page facing upward. Further, the original on the platen glass 12 passes through the paper buses a, a, and is ejected by the transport rollers 11, 11a onto the original placed on the original platen 1 with the fifth page facing upward. (hereinafter referred to as positive/exhaust operation).
From a certain time during this normal ejecting operation, the above-mentioned counter-feeding operation of the next document holding pages 4 and 3 is performed in parallel with the normal ejecting operation, and the fourth page is placed face down on the platen glass 12. The positioning is set (this operation in which the normal ejecting operation and the counter-feeding operation are performed in parallel is hereinafter referred to as the normal ejecting/reverse-feeding operation). After that, the above-mentioned copying operation is performed as many times as necessary, and finally the copy paper is ejected onto the paper output tray 46 as shown in Fig. 4, and the original is also placed on the original set without changing the initial set state as shown in Fig. 3. The document is discharged onto the tray 1, and double-sided copying from the double-sided original is completed.

(iv) Double-sided original - double-sided copying (with sorter) The operation is almost the same as the double-sided original - double-sided copying (without sorter) described in the previous section. However, when there is no sorter C, the forward, eject, and reverse feed operations are performed for each document exposure, whereas when the sorter C is installed,
Exposure of the original is carried out a number of times to set copies, and the original is once stored on the intermediate tray 40 as shown in FIG. I'll go. Finally, the copy sheets are stored in the sorter C as shown in FIG. Further, the original is also discharged in the same state as the initial set as shown in FIG. 3, and the entire process of copying is completed.

(v) Single-sided original - double-sided copying (without sorter) When the number of originals placed on the original platen 1 is n, the bottom original is O _o , and the top original is O ₁ , then Figure 8-1 or As shown in FIG. 8-2, two original document setting states are possible depending on whether n is an odd number or an even number. First, the case where n is an even number will be explained. 8th-
In Figure 1, first, the original O _o is set on the platen glass 12 in a normal feeding operation, and the copy paper on which this original O _o has been copied is placed in the intermediate tray 40 while the normal feeding operation is performed, and the originals O _o and O _{o -} Exchange manuscripts with ₁ . Next, the original O _o-1 is replaced with the next original O _o-2 by normal discharge and normal feeding operation without making a copy. While copying the original O _o-2 and putting the copy paper into the intermediate tray 40, the original O o-3 is replaced with the next original O _{o-3 by} forward ejection and feed operation in the same way. Set to . At this time, if the document O _o-3 is the first page document, the partition arm 22 is detected by the sensor RS19, the copying machine body B receives the cycle end signal from the double-sided document circulation device A, and the number n of documents is It is determined that there are 4 pieces and it is an even number. Then, for O _o-3 , the original is replaced with the next original O _o by a normal discharge and normal feeding operation without copying, and the original O _o is set on the platen glass 12. At this point, the original and copy paper are in the state shown in FIGS. 1 to 3 of FIG. 9-1.

Next, skip copying the original O _o and
Exchanging originals by forward ejection and forward feeding operation with O _o-1 ,
Place the original O _o-1 on the platen glass 12,
A copy of this original O _o-1 is made from the copy paper that is fed from the bottom of the one-sided copy paper stacked on the intermediate tray 40, that is, the copy paper on which the fourth page has been copied. The original O _o-1 , that is, the third page, is copied on the opposite side and is ejected onto the paper ejection tray 46. After that, repeat the same operation as described above, copy skip the original O _o-2 , and copy the original.
O _o-3 is copied so that the second page of the intermediate tray 40 is made on the opposite side of the copied copy paper and the first page is
One set of double-sided copy paper is discharged as shown in Figure 0-1. Then, the copying operation for the first copy is repeated a set number of copies. If the set number of copies is 3, the copy paper will eventually be in the state shown in FIG. 10-2 and the original in the initial set state as shown in FIG. 8-1, and the copying operation will be completely completed.

Next, a case where the number n of originals is an odd number will be explained. In FIG. 8-2, as in the case where the number of original sheets n is an even number, original O _o is copied and transferred to the intermediate tray 40, original O _o-1 is skipped, and original O _{o-2 is} copied.
is copied and transferred to the intermediate tray 40, the original O _o-3 is skipped, the original O _{o-4 is} copied and transferred to the intermediate tray 40, and so on.
During the document exchange with O _o-4, the copying machine main body B determines from the cycle end signal from the double-sided document circulation device A that the number of document sheets n is 5, which is an odd number. Then, the original O _o-4 is exchanged with the next original O _o , and the original O _o is placed on the platen glass 12.
Set to . At this point, the original and copy paper are in the state shown in FIGS. 1 to 3 of FIG. 9-2. Next, the copy operation for original O _o is skipped, and the next original O _{o-1 is copied.}
Originals are exchanged using normal ejection and normal feeding operations. At the same time as this exchange, the copy paper on which the fifth page was copied on the intermediate tray 40 is transferred to paper buses b, b, b.
The copy paper is then placed on top of the copy paper on the intermediate tray 40 again. Next, the original O _o-1 is copied onto the reverse side of the copy paper on which the third page was copied on the intermediate tray 40, and then it is placed on the intermediate tray 40 again in the same manner as the circulation path of the copy paper for the fifth page. Place it on the top of the copy paper. At the same time as this circulation, the original O _o-1 and the next original O _o-2 are exchanged,
Set the original O _o-2 on the platen glass 12.
Then, the copying operation of the original O _o-2 is skipped, and the copying of the original O _o-3 is performed on the reverse side of the copy paper on which the first page was copied on the intermediate tray 40, and then the original O _o-3 is transferred to the intermediate tray 40 again. _-4 copy operation is skipped. At this point, the copy paper is in a state as shown in Figure 10-3. Thereafter, the copy paper on the intermediate tray 40 is conveyed sequentially from the bottom, passes through paper buses b, b, b, and reaches the paper output tray 4.
Some double-sided copies are ejected onto 6. After that, repeat the above operation as many times as necessary for the set number of copies,
If the set number of copies is 3, the copy paper will eventually be in the state shown in FIG. 11 and the original in the initial set state as shown in FIG. 8-2, and the copying will be completely completed.

(vi) Single-sided original - double-sided copying (with sorter) The difference from the operation sequence in the case of (v) single-sided original - double-sided copying (without sorter) explained in the previous section is that when there is no sorter C, the operation sequence of a certain original is In contrast to the case where the normal discharge and normal feeding operation was performed for each document exposure, when the sorter C is installed, the document exposure for a certain document is performed a number of copies set. When the number of originals is four as shown in FIG. 8-1 and the set number of copies is three, the copy sheets on which even-numbered pages have been copied are temporarily stored on the intermediate tray 40 as shown in FIG. 12-1. Then, the sheets are fed from the bottom to perform a copying operation for odd-numbered pages, and the copying operation is completed with the pages stored in the sorter C as shown in FIG. 12-2. Furthermore, if the original is 5 sheets as shown in Figure 8-2 and the set number of copies is 3, the copy paper on which odd-numbered pages have been copied is temporarily stored on the intermediate tray 40 as shown in Figure 13-1. . Then, the sheets are fed from the bottom, copying the even numbered pages, placing them in the intermediate tray 40 again as shown in Fig. 13-2, and then moving to the sorter C without performing the copying operation.
Finally, as shown in FIG. 13-3, the data is stored in each bin of the sorter, and the copying is completed.

Next, a control section of the apparatus for executing the copying operation as described above will be explained.

FIG. 14 is a schematic diagram of a control circuit for performing the above-described sequence operation. In the figure, the double-sided original circulating device A, the copying machine main body B, and the sorter C are each indicated by dotted lines. Signals are exchanged between devices A, B, and C using cables 122 and B, C.
The data transfer is performed via a cable 121 using a serial transfer method (described later). 123a, 123
b, 123c, 123d are line receivers for receiving serial signals, using Schmitt TTL,
The circuit configuration is as shown in FIG. or,
124a, 124b, 124c, 124d, 12
4e, 124f, 124g, 124h, 124
i and 124j are line drivers for serial signal transmission, which use a TTL driver and have a circuit configuration as shown in Figure 16. 120 is ROM,
It is a well-known one-chip microcomputer (hereinafter referred to as a microcomputer) having a built-in RAM, etc., and for example, μ-COM43N manufactured by NEC Corporation can be used. A 5V power is supplied to the microcomputer 120 from a DC power supply 125 to enable execution of internal programs. The input ports I ₁ to I ₁₀ of the microcomputer 120 include
Each sensor signal, the signal of the micro switch MS126 that is activated when the double-sided document circulating device A is opened from the front side, the request signal REQ from the copying machine body B
etc. are input. Furthermore, either the conveyance clock outputted from the sensor 105 (FIG. 2) or the belt clock outputted from the sensor 95 (FIG. 2) is connected to the interrupt input terminal via the AND gates Q ₁ , Q ₂ ,
It is input from a circuit consisting of an OR gate Q ₃ and an inverter Q ₄ . Switching between the conveyance clock and the belt clock is performed by a switching signal CS127 output from the output port _O13 . Also, output port
Drivers _D1 to _D11 are connected to O1, _O2 , _O3 to _{O11 ,} and each load can be driven via these drivers _D1 to _D11 . Further, _O12 is an output port that outputs an acknowledgment signal ACK to be sent to the main body B of the copying machine. In addition, the driver 128 including the electric brake is connected to output ports O ₃ and O ₄ , respectively.
The M3CW signal and the M3CCM signal are input to control the rotation of the transport motor M3. Also, 129
This is an electric brake circuit, and when the M2 signal from output port _O5 is turned off, the separation motor M2 is turned off and the electric brake is applied instantly.

Next, the above-mentioned serial method will be explained. FIG. 17 is a timing chart of serial transfer. A request signal is sent from the copying machine body B.
REQ is always sent at a certain interval. Signal REQ is input port of microcontroller 120
When input to _I19 , an acknowledge signal is sent from the output port _O12 of the microcomputer 120 of the double-sided original circulating device A.
Outputs ACK and sends the microcomputer 12 from the copying machine body B.
The serial data Si from the copying machine body B and the serial data SO from the double-sided original circulating device A are transferred in units of 8 bits per request in synchronization with the clock signal SCK outputted to the input port 0. For detailed timing, please refer to μ
-This is the same method as the COM43N serial transfer, so it will be omitted.

The field FLDi1 shown in FIG. 17 is 8-bit data sent to the double-sided document circulating device A, and bit 7 is a field designation bit that is always "0", and bit 6 is used to control the document feeding in the copying machine body B. , a document feed signal that causes document exchange, bit 5 is a document ejection signal that causes copying machine B to only eject the document at JAM, at the end of final exposure, etc., and bits 3 to 0 are the document feed signals described above. This is an operation command signal for performing each operation of normal/exhaust feed, normal/exhaust/reverse feed, anti-exhaust feed, anti-exhaust/reverse feed, and return/repeat operation. For example, for anti-exhaust feed operation, bits 3 to 0 are 0.0. .1.0. In addition, fields FLD01, FLD02, and FLD03 shown in FIG. 17 are 8 bits each and a total of 24 bits of data to be sent to the copying machine body B. Each bit 7 and 6 has a field designation bit, which is used to distinguish each field. is becoming possible. Bit 5 of FLD01 is an original feeding completion signal that turns on when the original is conveyed and set on the platen glass 12 (Fig. 1), and bit 4 turns on when the original feeding signal from the copying machine body B is received. The operating signal, bit 3, is a driving signal that is turned on while the double-sided document circulating device A is executing the document conveyance sequence, especially when a heavy load such as a motor is on.
This signal is used to suppress the maximum power consumption of the entire system including the copying machine body B.
For example, this can be done by turning off the halogen lamp in the fixing device 39 of the main body B of the copying machine while this signal is on. Bits 2 to 0 indicate the document size signal detected by the sensors 13 and 14 while the document is being conveyed from the document tray 1 to the platen glass 12. For example, for A4, bit 2 is
~0 becomes 0.0.1, and is sent to the copying machine main body B almost simultaneously with the document feeding completion signal. Also, bit 5 of FLD02 indicates that the last document is sent out in one circulation of documents, and the cycle end sensor RS19 (first
The partition arm 22 (first
This is a cycle end signal that turns on by detecting (Fig.). Further, bit 4 indicates the state of the document detection signal which is turned on when a document is placed on the document table 1 (FIG. 1). Bits 3-0 of FLD02 and FLD03
Bits 3 to 0 are the original number signal for transmitting the number of recognized originals at the same time as the cycle end of the original is detected.
It is expressed as a binary number with the side as the lowest, and hypothetically 20 in decimal
If this is the case, FLD02 bits 3-0 and FLD03 bits 3-0 are 0.1.0.1 and 0.1.0.0., respectively.
Bit 5 of FLD03 is a JAM signal that is generated when a document feeding failure occurs in the double-sided document circulating device A.
Bit 4 is a door open signal generated when the opening/closing microswitch MS126 (FIG. 15) is activated, that is, when the double-sided original circulating device A is opened. This signal is for copying an original such as a book for which the double-sided document circulation device A cannot be used. If this signal is present, when the copy button on the copying machine body B is pressed, a document feed signal is sent to the double-sided document circulation device A. First, the copying operation of the copying machine main body B is started.

FIG. 19 is a timing chart showing the timing of each signal of the serial data described above for each operation 135 of the double-sided document circulation device (RDF) A and the copying machine main body B. 136 is from the copying machine body B
The serial signal sent to RDFA, 137, is
A serial signal 138 sent from the RDFA to the copying machine body B indicates a sequence within the RDFA. In this example, one copy is made from two originals, and a jam occurs in the RDF when the second original is ejected.

Next, the operation of RDF will be explained with reference to the control flowcharts shown in FIGS. 19-30 and the timing charts shown in FIGS. 31-40.

Figure 19 is the main flowchart for performing the above-mentioned RDF operation sequence, and Step201
This performs an initial reset operation when the power is turned on, turning off each output port, clearing the RAM area inside the microcomputer 120, and clearing each counter, timer, command, etc. to be described later. Next Step202
Now, determine whether or not JAM is in progress. If JAM is in progress, proceed to JAM RESET SUB in Step 205 and start JAM.
Wait for RESET, if not in JAM, next Step 20
Proceed to step 3. In step 203, it is determined whether the door of section A is open, and if it is open, the sequence operation is ignored and the process proceeds to step 208, but if it is closed, it is assumed that the door is normal and the process proceeds to the next step 204. In Step 204, proceed to SEQUENCE CHECK SUB. this is
This is a routine that performs the operation sequence of the RDFA section, and the details will be described later. Next Step 206 is a routine that increments each timer started in Step 204 one by one, and Step 207 judges whether there is an input to the INT terminal to which either the conveyor clock or belt clock is input, and if so, the above-mentioned
Each counter activated in Step 204 is incremented by one. Step 208 is SIRIAL CHECK
This is a routine that proceeds to SUB and performs the operation sequence for performing the above-mentioned serial transfer with the main body of the copying machine (section B). If the main flow is normal
After processing Steps 202, 203, 204, 206, 207, and 208, the process returns to Step 202, forming a loop. Each SUB routine is called by the microcomputer's CAL command, and after the processing is completed, it returns with the RET command and then returns to Step 202. The structure is such that you can proceed step by step.

Figure 20 shows the above step 204.
This is the detailed flow of SEQUENCE CHECK SUB. In step 211, it is checked whether a start command, which will be described later, is set. If it is set, it is determined that a sequence operation is in progress, and the process proceeds to step 214. If it has not been set, the process advances to Step 212, in which a command to start operation from the copying machine body B is awaited.
In Step 212, the serial data mentioned above,
The operation should start when either (original feed signal) or (original ejection signal) is set.
Proceed to Step 213. However, (original ejection signal) is only available when (original feeding completion signal) is set.
In other words, it is accepted only when an original is fed onto the platen glass 12 of the copying machine and copying is in progress, and at that time, the current content of the [original sheet number counter] is set in (original sheet number signal), which will be described later, and the main unit is notified. . If neither of the above is set, the progress of RET, SEQUENCE
CHECK SUB enters the waiting state. Next, Step 213 will be explained. Step 213 is a step for specifying the operation mode of the sequence operation and starting the operation.
First, in order to prohibit changing the operation mode from the start of operation until the end of the copy operation of copying machine body B, a start command is set so that the operation mode is determined only at the start of operation, and during operation, the operation mode is determined as in Step 211. I am trying to ignore Step 213. Furthermore, in Step 213, the serial data (original feeding completion signal) is reset when the copying operation of the copying machine body B is completed, and the (operating signal) is set to notify the start of operation, and when one cycle of the original is completed. (cycle end signal) output at the end of the cycle. Then, a paper feeding permission command, which will be described later, is set to instruct the start of the paper feeding operation. Furthermore, the contents of the operation mode command signal (operation command signal) from the copying machine main body B are stored in the table counter (MDCN), and the process advances to Step 214. In Step 214, the branch is made depending on the contents of the table counter (MDCN) mentioned above. When (MDCN) = 0, the process proceeds to the positive/exhaust normal feed SUB to perform positive/exhaust normal feeding mode processing; Counterfeed SUB, (MDCN) = 2
Then, anti-exhaust feed SUB, (MDCN) = 3, anti-exhaust feed SUB
If SUB, (MDCH) = 4, go back to SUB.
In this case, at the start of operation, the operation mode is specified in Step 213, the contents of the table counter (MDCN) are determined according to the mode, and the processing routine for each mode is proceeded to according to the contents of the table counter (MDCN) in Step 214. For example, the first page of the original is fed by the normal feeding operation, and then the copying operation is performed.
At the start of the next operation, if you change the mode specification and specify anti-discharge and counter-feeding operation, the first document will be ejected in the counter-discharge mode, the second document will be fed in the counter-feed mode, and so on. At the start of operation, the mode of the next operation can be changed arbitrarily according to the contents of the (operation command signal) of the copying machine main body.

FIG. 21 shows a SUB routine for performing paper ejecting and feeding operations according to the operation commands defined in FIG. 20 described above. Step 221 is a routine that performs normal ejection, normal feeding, and proceeds sequentially to normal ejection SUB, normal feeding SUB, and paper feeding completion SUB, which will be described later.In each SUB routine, paper ejection, paper feeding, and paper feeding completion processing are performed in parallel. By doing this, the sequence operation is progressing. Similarly Step222
In Step 223, the forward discharge/reverse feed operation is performed, in Step 223, the reverse discharge and reverse feed operation is performed, in Step 224, the reverse discharge and reverse feed operation is performed, and in Step 225, the return operation is performed. In each of Steps 221 to 224, it is determined whether the document ejection signal is set, and if it is set, only the ejection operation is performed, and in Step 225, the operation is prohibited. Each of Steps 221 to 224 starts with a paper ejecting operation, but if there is no document to be ejected onto the platen glass 12 of the copying machine, no paper is ejected.

Next, let's take the case of two originals as an example of the normal ejection and normal feeding operation.
This will be described in detail with reference to the flowchart of paper feeding completion SUB in FIG.

Now, a stack of two originals is placed on the original table 1, the normal discharge and normal feeding mode is designated from the copying machine main body B, and the original feeding signal is set to start the normal discharge and normal feeding operation. The normal pay for the first page of the manuscript is shown in Figure 22.
At Step 231 in SUB, the sensor ES (Fig. 1-1 20) detects the document, and the paper feed permission command is issued as described above.
Since it was set in Step 213, the paper feed permission command is reset to perform only normal feeding operation, the reversal permission command is reset, the paper feeding command is set, and other operation prohibition commands are issued, and sensor S1 (1st
-1 Start the JAM timer [JAM] up to Figure 13), turn on the separation motor M2 (80 in Figure 1-1), start document separation, and set "1" to the table counter [iNCN] to proceed to Step 232. Set. Each Step branches depending on the contents of the table counter [iNCN], and as the operation sequence progresses, the table counter [iNCN] is updated and the Steps are
This is the configuration in which this is processed. Further, other table counters described later perform similar operations. Next Step232
Now, we will monitor whether the leading edge of the separated document is detected by sensor S1 until the JAM timer [JAM] ends, and if the time is up, it will be detected as a separation failure.
Proceed to JAM RESET SUB. If it is normal, the leading edge of the document traveling along the transport path Ia will hit the rollers 6 and 6a, and a timer [TM1] will be activated to create a loop.
Start the table counter [iNCN] ←
2 and proceed to the next step. In Step 233, wait for the timer [TM1] to end, turn off motor M2, create a loop, and then start the loop stabilization timer [TM2].
Start the table counter [iNCN] ←
3 and proceed to the next step. In Step 234, after waiting for the end of the loop stability timer [TM2], the signals M3CW, M1CW, CL, and SL output from the output ports O ₃ , O ₆ , O ₈ , and O ₁₀ of the microcomputer 120 are turned on.
The document conveyance is started, a paper ejection permission command to be described later is set, the JAM counter [JCN1] up to the sensor S2 (Fig. 1-1 14) is started, and the table counter [iNCN] is set to ←4, and the process proceeds to the next step.
In Step 235, the JAM counter [JCN1] monitors whether the leading edge of the document is detected by the sensor S2 until it ends, and if it counts up, it is considered as a delayed JAM.
Proceed to JAM RESET SUB. If it is normal, the sensor S2 starts the JAM counter [JCN2] until the document comes out to detect accumulated JAM, and then starts the [document size counter] to start detecting the document size, and then Set the table counter [iNCN] to 5 and proceed to the next step. In Step 236, it is monitored whether the sensor S1 detects the trailing edge of the document, and if it is detected, it starts the counter [CN1] that counts the number of clocks corresponding to the distance from the sensor S1 to the rollers 6, 6a, and starts the table counter [iNCN]. ] ← Set to 6. Step237
Then, wait for the counter [CN1] to finish, turn on the signal CS output from the output port _O13 , and then set the table counter [iNCN]←7. This is because when the document is spread over both the rollers 6 and 6a and the belt 8, the conveyance speed is equal to the conveyance speed of the rollers 6 and 6a. However, after the trailing edge of the document comes out of the rollers 6 and 6a, the conveyance speed becomes equal to the conveyance speed of the belt 8, so it immediately becomes dependent on the belt clock output from the disk 94 and the photoelectric sensor 95. . Therefore, at the end of the counter [CN1], that is, when the trailing edge of the original passes through the rollers 6 and 6a, the clock is switched from the conveyance clock to the belt clock by turning on the switching signal CS that controls input to the clock interrupt terminal INT. This makes it possible to continue control without changing the correspondence between the transport distance and the clock. In Step 238, check whether sensor S2 detects the trailing edge of the document.
Monitor the JAM counter [JCN2] until it ends,
If the count goes up, it becomes JAM as accumulated JAM.
Proceed to RESET SUB, and if it is normal, immediately stop the [document size counter] when the trailing edge is detected, complete the document size detection, and at the same time move the document to a predetermined position a on the platen glass 12 of the main body B of the copying machine.
The registration counter [RGCN1] is started up to 1, and since one document has been conveyed, the [manuscript sheet number counter] is incremented to count the number of document sheets, and the table counter [iNCN] is set to ←8 to proceed to the next step. In Step 239, wait for the registration counter [RGCN1] to finish, and at the end, turn off the signals M3CW, M1CW, and CL, turn on the signal BK, and turn on the signal BK to stop the sheet accurately at a predetermined position a on the platen glass 12. Reset the command, set the reversal permission command described later, set the table counter [iNCN] to 0, and return to Step 231.
It enters a waiting state. At this point, the paper feed permission command has been reset in Step 231, so the process is in a waiting state.

Next, paper feeding completion SUB will be explained with reference to FIG. First, table counter [SETCN] =
Step 281 is being processed at 0. During the normal feeding operation, the paper feeding command is set, so the paper feeding completion command is set and the machine enters a standby state. This is because the paper feeding command is reset in Step 239 mentioned above, and the reversing command described later is also reset, so the standby state is canceled and the paper feeding completion command is also set, so the brake BK9 is reset.
2 Start the on-time timer [TM3], judge the original size from the contents of the [original size counter], and process the SUB routine SIZECK SUB to store the original size data in the (original size signal) in the serial data. Furthermore, it stores the (original paper feed completion signal) in serial data and outputs a copy start command for the copying machine, and the copying machine, which checks this, turns off the (original paper feeding signal) and outputs a copy start command to the copying machine.
Start copying the first sheet. Furthermore, turn off the switching solenoid SL to switch the document conveyance path between normal and ejection, and press the table counter [SETCN] ←
Set it to 1 and proceed to the next step. In step 282, wait for the timer [TM3] to end, turn off the brake BK, set the table counter [SETCN] to 2, and proceed to the next step. In Steps 283 and 284, the partition arm 22 and pulse motor 21 are processed to detect one circulation of the document bundle, and in Step 283, a sensor is used to detect whether there is a next document on the document table 1.
Judging the output of ES, if there is no next manuscript,
Since it can be determined that the number of originals is one, there is no need to process the pulse motor 21, and the table counter [SETCN] is set to ←4, and the process proceeds to Step 285. If there is a next original, it is checked whether the [original sheet number counter] = 1, and if it is not "1", it is determined that the number of original sheets is 2 or more, and the processing of the pulse motor 21 should have already been performed. Same as above
Proceed to Step 285. Since (counter) is currently "1", it is determined that this is the first document, and the counter [PLSCN] is started, which causes the pulse motor 21 to rotate once in order to process the pulse motor 21, and the table counter [ SETCN〕←Next as 3
Proceed to Step. In Step 284, the counter [PLSCN] is incremented by 1 each time the routine process is performed, and if the pulse motor 21 is off, it is turned on, and if it is on, it is turned off, thereby increasing the step angle of the pulse motor one by one. At the end of [PLSCN], the pulse motor 21 is rotated once,
Table counter [SETCN] ← Next Step as 4
Proceed to. In Step 285, the setting of the paper discharging command is checked to wait for the end of the paper discharging process, and if it is reset, it is determined that the paper discharging is completed.
Move on. Since it is currently the first document, it continues and monitors whether the recycle sensor RS19 is detecting it.Since it is still the first document, the recycle sensor RS continues to detect it, so the partition arm 22 still remains on the document. It is determined that the manuscript is still being circulated, and that the circulation of the manuscript is continuing. However, as described later, if there is no detection, it is determined that one cycle of originals has been completed, and the contents of the [original sheet number counter] are stored in serial data (original sheet number signal) as one set of original sheet number data, and the original The contents of the sheet number counter are cleared and at the same time, a (cycle end signal) is set to notify the copying machine of the end of one cycle. In step 285, the paper feeding completion command is further reset, the above-mentioned start command is reset, the paper ejection permission command and the reversal permission command are set, and the table counter [SETCN]←0 is set to enter the standby state.

By resetting the start command at this point, the process advances to Step 212 in Figure 20. If the copying machine is copying, both the (original eject signal) and (original feed signal) have been reset, so the process goes to RET. It returns to a waiting state.

Next, the normal discharge and normal feeding operation after the copying operation is completed will be explained. In FIG. 20, at the end of copying, when the (original paper feed signal) is set, the process proceeds to Steps 213 and 214, where the (original paper feed completion signal) is reset and the normal/discharge/normal feed SUB is called. Figure 21 Positive/exhaust supply SUB
In order to perform the normal ejection of the first original and the normal feeding of the second original at the same time, the normal ejection SUB and the second
Perform parallel processing of the positive SUB shown in Figure 2. Referring to FIG. 25, the normal ejection process for the first document will be explained. If the table counter [EJCN] = 0, proceed to Step 261,
Check whether the paper discharge permission command is set. In this case, since it is set in Step 234 in the normal feed SUB, proceed to the next step and reset the paper discharge permission command, and then issue the paper feed permission command and the reversal permission command. Reset and prohibit other operations, set the paper discharge command, start the interval timer [TM4], set the table counter [EJCN] to 1, and proceed to the next step. In Step 262, wait for the end of the interval timer [TM4] and turn on the signals M1CW and CL.
Turn on to start the document ejection operation, and the ejection sensor
Start the JAM counter [JCN10] up to S315, set the table counter [EJCN] ← 2, and then
Proceed to Step. In Step 263, the document advances through the conveyance path a and monitors whether the document discharge sensor S3 detects the leading edge of the document until the end of the JAM counter [JCN10].
If the count goes up, it will be called a delayed JAM.
Proceed to RESET SUB. If normal, output sensor
Start the JAM counter [JCN11] up to S416, set the table counter [EJCN]←3, and proceed to the next step. In Step 264, the JAM counter [JCN11] determines whether the paper ejection sensor S4 detects the leading edge of the document.
Monitor until the end and delay if the count up
Proceed to JAM RESET SUB as JAM. If it is normal, the signals M3CW, M1CCW, CL,
The CS is turned off to temporarily stop the conveyance, and the first document is stopped at a position spanning the rollers 6, 6b and belt 8. At the same time, by setting the paper feed permission command, the start of the normal feeding operation for the second document is commanded, and the normal feeding operation shown in Fig. 22 is set.
The standby state of Step 231 in the SUB is canceled, a paper feeding command is set, and separation of the second document is started as described above. Furthermore, start the interval timer [TM7] and set the table counter [EJCN]←4 to proceed to the next step. In Step 265, wait for the interval timer [TM7] to end,
After completion of the process, the printer enters a standby state until the paper feeding command and the paper discharge permission command are set. In FIG. 22, the normal feeding operation of the second document progresses, and at Step 234, that is,
Since the paper ejection permission command is set at the start of conveyance of the second document, in Step 265, the next step is to reset the paper ejection permission command, start the JAM counter [JCN12] until the document passes through sensor S4, and then Turn on the signal M3CW, start the paper ejection operation, set the table counter [EJCN] ← 5, and proceed to the next step. In Step 266, it is monitored until the end of [JCN12] whether sensor S4 detects the trailing edge of the document, and if it counts up, it is considered as a retained JAM and JAM RESET
Proceed to SUB. If it is normal, proceed along the conveyance path a and start the rotation timer [TMOUT] after paper ejection.
Table counter [EJCN] ← 6 and proceed to the next step. In Step 267, after waiting for the end of the post-discharge rotation timer [TMOUT], the signal M3CW is turned off, the paper discharging command is reset, and the paper discharging operation is finished.
As will be described later, if this paper ejecting operation is due to a paper ejecting command from the copying machine main body, that is, if the (original ejecting signal) is set, the start command shown in FIG. 20 is reset and the serial data ( The operation signal) is reset, all operations are completed, and the table counter [EJCN] is set to ←/0 and the process returns to Step 261 to wait. If this second document is being fed, paper feeding is complete as shown in Figure 27.
SUB processing is continuing in parallel with the first document ejection process, and the (original feeding complete signal) is set.
The copying machine itself is making a second copy. Also 2
Since one cycle of the original is completed by feeding the first original, the recycle sensor RS is turned off in step 285, a cycle end signal is output to the copying machine, and the start command is turned off, as shown in Fig. 20. It enters a standby state in Step 212.

Next, the forward ejecting operation of the second document will be explained.
In this case, since the cycle end signal has been output, the main body of the copying machine sets the (original discharge signal) after copying the second sheet in order to perform only paper discharge processing. At that point, only the positive discharge SUB is processed in Step 221 in the positive discharge SUB shown in Figure 21, and the positive discharge SUB
etc. will not be executed. The normal ejection SUB processing is performed sequentially from Steps 261 to 267 in Fig. 25, and in Step 267, the operation ends because the (original ejection signal) is set as described above, and the start command and (in-operation signal) are executed.
, the copying machine checks it, turns off the document discharge signal, and completes one cycle of copying the document.

Next, the forward discharge/reverse feed operation will be explained. This process is carried out by the normal ejection/reverse feeding SUB shown in Step 222 in FIG. When the leading edge of the document reaches S4 (Step 264), the forward ejecting operation temporarily stops and the reverse feeding operation of the next document starts, as shown in Figure 22.
After entering the conveyance path a by the SUB and performing separation, the normal ejection operation is resumed by the rollers 6 and 6a at the time of start of conveyance (Step 234), and the discharged document advances from the conveyance path a to the conveyance path a. On the other hand, at the end of the normal feeding operation, the document is on the glass surface a, and it is temporarily stopped there.
The process moves to the reversing SUB shown in Fig. 24, waits until the parallel normal discharge operation is finished (Step 243), and as soon as it is finished, the reversing SUB process is restarted, and the original is transferred to the transport path a~a~a~a~a~a. and stops at a predetermined position on the platen glass 12 surface of the copying machine,
A copy operation start command is issued at paper feeding completion SUB in FIG. 27.

Also, regarding the anti-displacement feeding operation, see Figure 21.
It is processed by the anti-exclusion supply SUB shown in Step 223.
The original on the platen glass 12 surface a is
The paper is ejected through the transport path a by the anti-ejection SUB shown in Figure 6, and when the trailing edge of the original is detected by the sensor S517 (Step 274), the anti-ejection operation is temporarily stopped and the next original is ejected. Start the feeding operation and start the second
After entering the conveyance path a by the normal feed SUB in Figure 2 and performing separation, the counter-discharge operation is started again at the time of conveyance start (Step 234) by the rollers 6 and 6a, and the ejected original passes through the conveyance paths a to a and is ejected. be done. On the other hand, the fed document reaches the conveyance path a to a, and when it stops at a predetermined position on the surface of the platen glass 12, a copy operation start command is outputted at the paper feeding completion SUB shown in FIG.

Furthermore, regarding the reversing operation, see Figure 21.
The document processed by the repeat SUB shown in Step 225 and placed on the platen glass 12 surface a is the 23rd,
The conveyance path a~a is moved by the inverted SUB shown in Figure 24.
〜a〜a〜a〜a, and when it stops again at a predetermined position on the platen glass 12 surface, the second
A copy operation start command is output at the paper feeding completion SUB in Figure 7.

Next, regarding the counter-discharge and counter-feed operations, taking the case of two originals as an example,
This will be explained with reference to the flowcharts of the inversion SUB shown in the figure and the anti-ejection SUB shown in FIG. When two originals are placed on the original platen 1 and the copying machine specifies the anti-reverse/reverse feed mode, and the (original feed signal) is set, the anti-reverse/reverse feed operation is performed in Step 224 of Fig. 21. starts. The first manuscript is the regular payment shown in Figure 22.
The process is performed as described above according to the SUB, and when it travels along the transport path a to a and stops at a predetermined position on the platen glass surface of the copying machine main body, a reversal permission command is set in Step 239, and the sequence starts at the 23rd step.
Move to the inverted SUB shown in Figure 24.

In Fig. 23, since the table counter [TRNCN] = 0, the process proceeds to Step 241, checks the setting of the reversal permission command, starts the reversing operation, resets the reversal permission command, sets the in-reversing command, and sets the transport path. Turn on the signal SL to turn on the switching solenoid and use the interval timer [TM4]
Start the table counter [TRNCN]
← Go to the next step as 1. In Step 242,
Wait for the end of [TM4] and then apply the brake 92 drive signal.
Turn off BK, turn on the drive signal CL of the clutch 85, set the table counter [TRNCN]←2, and proceed to the next step. In step 243, it is checked whether the paper ejection command is set and waits for the ejection operation to finish, but since the first document is being conveyed, it has been reset, and the signal M1CCW is turned on and the belt 8 is turned on.
Start the reversal drive of , proceed along the transport paths a and a, start the JAM counter [JCN3] up to sensor S5, set the table counter [TRNCN]←3,
Proceed to the next step. In Step 244, it is monitored whether sensor S5 detects the leading edge of the document until the JAM counter [JCN3] ends, and if it ends, it is considered as a delayed JAM.
Proceed to JAM RESET SUB. If it is detected normally, turn on the signal M3CCW, rotate the rollers 9 and 9a, start the JAM counter [JCN4] until the document passes through the sensor S5, set the table counter [EJCN]←4, and proceed to the next step. In Step 245, check whether sensor S5 detects the trailing edge of the document or not.
Monitor until the counter [JCN4] ends, and when it ends, proceed to JAM RESET SUB as a retained JAM.
If normal, the signals M3CCW, M1CCW, CL, SL,
Turn off all CS, stop the document transport on transport path a, start the interval timer [TM5], and set the table counter [TRNCN]←5
As such, proceed to the next step. In Step 246, wait for the end of the interval timer [TM5], turn on the signal M3CW, rotate the rollers 9 and 9a, advance the document to the conveyance path a, start the JAM counter [JCN5] up to sensor S618, and Counter [TRNCN]←6 and proceed to the next step.
In Step 247, monitor whether sensor S6 detects the leading edge of the document until the end of JAM counter [JCN5].
When finished, JAM RESET SUB as delayed JAM
Proceed to. If it is normal, the original is placed on rollers 10 and 10a.
From there, it passes through the conveyance path a toward the rollers 11 and 11a, starts the JAM counter [JCN6] until the document passes through the sensor S6, sets the table counter [TRNCN]←7, and proceeds to the next step.
In Step 248, the sensor S6 monitors whether the trailing edge of the document is detected until the JAM counter [JCN6] ends.
When finished, JAM RESET SUB as retained JAM
Proceed to. If normal, turn off the signal M3CW, stop the document on the transport path a, start the interval timer [TM6], set the table counter [TRNCN]←8, and proceed to the next step. Step249
Then, wait for the end of the interval timer [TM6], turn on the signals M3CCW, CL, and SL to start driving, advance the document to the conveyance path a by rollers 10 and 10a, and check the JAM counter up to sensor S4. Start [JCN7] and set the table counter [TRNCN]←9 to proceed to the next step. Second
In Figure 4, in Step 251, the sensor S4 monitors whether the leading edge of the document is detected until the JAM timer [JCN7] ends, and if it ends, the JAM is processed as a delayed JAM.
Proceed to RESET SUB. If normal, start the JAM counter [JCN8] up to sensor S3 and send a signal.
Turn on M1CW and turn on the table counter [TRNCN]
← Go to the next step as 10. In Step 252, the JAM counter [JCN9] is monitored until the end of the JAM counter [JCN9] to see if the sensor S3 detects the leading edge of the document traveling along the conveyance path a, and if the end of the JAM counter [JCN9] is detected, the JAM RESET is determined as a delayed JAM.
Proceed to SUB. If normal, then start the JAM timer [JCN9] until the document passes through sensor S3, set the table counter [TRNCN]←11, and proceed to the next step. In Step 253, it is monitored whether the sensor S3 detects the trailing edge of the document until the JAM counter [JCN9] is completed, and when the JAM counter [JCN9] is completed, the process proceeds to JAM RESET SUB as a retained JAM. If it is normal, the document passes through the rollers 6 and 6a and advances along the conveyance path a, depending on the drive of the belt 8. At this point, the signal CS is turned on and the clock input to the interrupt terminal INT is conveyed. Switch from the clock to the belt clock, keep the correspondence between the clock and the transport distance unchanged as described above, start the registration counter [RGCN2] corresponding to the transport distance to a predetermined position on the platen glass surface of the copying machine, and then Counter [TRNCN]←12 and proceed to the next step. In Step 254, register counter [RGCN2]
Wait for the end of the signal M1CW off, CL off,
Turn BK on to obtain an accurate stop position, reset the reversing command, and set the table counter [TRNCN].
Return to ←/0 and end the inversion process.

In this state, the counter-feeding sequence ends and the 27th
The process moves to the paper feeding completion SUB shown in the figure, and as described above, the (original paper feeding completion signal) is set and the copying operation of the first original is started in the copying machine main body.

Next, a description will be given of the anti-ejecting operation for the first original and the anti-feeding operation for the second original after the first original has been copied. When the copying operation is completed, the copying machine sets the (original feed signal), and since the anti-discharge/reverse feeding mode is specified, it performs the process of Step 224 in Figure 21, and first starts the anti-discharge operation for the first original. Start from. In the anti-exclusion SUB shown in Figure 26, the table counter [EJCN] is set to 0, so Step 271
Process. In Step 271, the paper ejection permission command has been set in Step 234 of Fig. 22, so proceed to the next step, reset the paper ejection permission command, reset the paper feed permission command and reversal permission command, and prohibit normal feeding and reversal operations. Then, set the ejecting command, turn on the signal SL, start the interval timer [TM4] so that the ejected document advances to the transport path a, set the table counter [EJCN] ← 1, and proceed to the next step. move on. In Step 272, wait for the end of the interval timer [TM4], turn on signal M1CCW, and turn on CL.
When turned on, the document discharge drive is started, the JAM counter [JCN3] is started as it advances along the conveyance path a, and reaches the sensor S5, and the table counter [EJCN] is set to 2, and the process proceeds to the next step. In Step 273, we monitor whether sensor S5 detects the leading edge of the document until the end of the JAM counter [JCN3], and when the end of the JAM counter [JCN3], the JAM is counted as a delayed JAM.
Proceed to RESET SUB. Signal if normal
Turn on M3CCW and rotate rollers 9 and 9a.
Advance the document to transport path a, start the JAM counter [JCN4] until the document comes out of sensor S5, set the table counter [EJCN]←3, and then
Proceed to Step. In Step 274, the sensor S5 monitors whether or not it detects the trailing edge of the document until the JAM counter [JCN4] ends, and if it ends, the JAM is counted as a retained JAM.
Proceed to RESET SUB. Signal if normal
M3CCW off, M1CCW off, CL off, SL off,
CS is turned off and the document is stopped on transport path a.
At the same time, by setting the paper feed permission command, a command is issued to start the counterfeeding operation for the second document, as shown in Fig. 22.
The standby state in Step 231 is canceled, a paper feeding command is set, and separation of the second document is started. Furthermore, start the interval timer [TM5], set the table timer [EJCN]←4, and proceed to the next step. In step 275, the process waits for the interval timer [TM5] to end, and then enters a standby state until the paper feeding command and the paper discharge permission command are set. On the other hand, the paper feeding operation for the second document progresses, and the paper discharge permission command is set at Step 234 in FIG. 22, so in Step 275, the paper discharge permission command is reset and the signal
Turn on M3CW and move the ejected document from transport path a to a.
JAM timer up to sensor S6 [JCN5]
Start the table counter [EJCN] ←5
Then proceed to the next step. In Step 276, it is monitored until the end of the JAM timer [JCN5] to see if sensor S6 detects the leading edge of the document, and if it ends, it is delayed.
Proceed to JAM RESET SUB as JAM. If it is normal, the document is caught on the rollers 10 and 10a, moves toward the conveyance path a, starts the JAM counter [JCN6] until the document passes through sensor S6, sets the table counter [EJCN] to 6, and proceeds to the next step. . In Step 277, monitors whether sensor S6 detects the trailing edge of the document until the end of the JAM counter [JCN6], and if it ends, it is considered as a retained JAM and JAM RESET
Proceed to SUB. If normal, the document advances along the conveyance path a, is caught on the rollers 11 and 11a, starts the rotation timer [TMOUT] after paper discharge, and advances to the next step as the table counter [EJCN]←7. In Step 278, wait for the end of rotation after paper ejection [TMOUT], turn off the signal M3CW, stop the paper ejection drive,
The paper ejecting command is reset and the table counter [EJCN] is set to ←/0 as described above, and the process returns to Step 271 and enters the waiting state.Meanwhile, the paper feeding process is performed as shown in Fig. 23.
At Step 243, the reversing operation is resumed because the printer is waiting for the reset of the ejecting command, and as described above, the paper feeding completion process is performed from Step 281 in Figure 27, and the copier is instructed to copy the second original. do.

Next, for the anti-ejecting operation of the second original, the (original ejecting signal) is set from the copying machine main body as described above, and only the ejecting operation is performed, and the processing is performed in the anti-ejecting SUB shown in Fig. 26. The process advances to step 278, and since the document discharge signal has been set in step 278, the start command is reset, the operation signal is reset, and all operations are completed.

Next, jam processing will be explained. JAM
The operation of RESET SUB is shown in Figure 28.
In Step 291, all loads are turned off, the JAM command is set, the signal JAM from the output port _O11 is turned on, and the jam lamp 24 is turned on. Furthermore, set the serial data (JAM signal), and then
In Step 292, check whether each document detection sensor S1 to S6 and ES is detecting a document, and if any one is detected, the process does not proceed to the next step and JAM RESET
Not allowed. When the operator removes the original and turns off the original detection signals from all sensors, the process proceeds to Step 293. Here, it is determined whether the operator has opened or closed the door, and once it has been performed, the process proceeds to Step 294, where the JAM command is reset, and the JAM signal from output port _O11 is output.
off, reset (JAM signal), reset all commands, reset all counter timers.
JAM RESET processing is completed.

Next, document size detection processing will be explained. SIZECK SUB will be explained with reference to FIG. The fed original is counted by the [original size counter] while sensor S2 is detecting the original using the transport clock and belt clock, that is, from the leading edge of the original to the trailing edge, and data corresponding to the size is stored. There is. Therefore, input the data of [Original Size Counter] to the predetermined original size.
The document size is determined by comparing it with data from A3 to B5. For example, if it is A4, it can be determined when the relationship is B5R data>[Original size counter]≧A4 data, and processing such as setting 1 to the serial data (original size signal) sent to the copying machine body is performed. After determining the size at the end of processing, the (original size counter) is cleared and in preparation for detecting the size of the next fed document, the document size is determined one by one. Also, at this time, when the original whose size has been detected is subsequently reversed or ejected, a jamming JAM counter is set for each sensor.
By setting the counter data to the measured document size data plus α, more accurate retention can be achieved.
I am trying to detect JAM.

Next, the serial transfer method will be explained. Third
FIG. 0 is a flowchart for performing serial communication with the main body described above. In Step 301, it is checked whether a request signal REQ, which is a serial communication request signal from the main body, has been input, and if input is present, serial communication is started. In Step 302, the aforementioned 8-bit serial transmission data (FLDO1) (FLDO2) is sent to the data storage register [SiREG] that is output to the SO terminal of the microcontroller 120 that transmits data to the main unit.
(FLDO3) is stored according to the contents of the counter [SOCN], the contents of the register [SiREG] are output to the SO terminal, and the acknowledge signal ACK, which informs the main unit that serial communication preparation is complete, is turned on. Here, serial communication between main body B and this device A is automatically performed using the μCOM43N method, and in Step 303 the serial communication
The check is continued until the communication is completed, and 8 bits of data are exchanged. In Step 304, the acknowledge signal ACK is turned off when the serial communication is completed, and the data is stored in the register [SiREG] from the Si terminal of the microcomputer 120 that received the data from the main unit, and the contents are further stored in the aforementioned serial transmission data 8 bit (FLDi1). do. Also, increment the contents of the counter [SOCN] mentioned above, and
If = 3, set [SOCN] ← 0 again and update the contents of [SOCN] sequentially for each serial communication.
The serial transmission data to be stored in the register [SiREG] of Step 302 is sequentially (FLDO1) → (FLDO2) →
It is specified as (FLDO3) → (FLDO1)...

Also, if there is no request signal REQ input in Step 301, serial communication will not be performed and Step 305, Step 306,
Proceed to Step 307 (FLDO1) (FLDO2) (FLDO3)
This is a step to set/reset the data.

In Step 305, the data (original detection signal) in (FLDO2) is set/reset depending on whether or not the entrance original sensor [ES] 20 detects the original.
In Step 306, the data (door open signal) in (FLDO3) is set/reset depending on whether the open/close switch [MS] 126 is detected. Also Step307
Then, the data (driving signal) in (FLDO1) is set/reset depending on whether the drive motors [M1] 82 and [M3] 97 are turned on.

31 to 39 are timing charts of each part of the RDF in each operation mode controlled according to the flowchart described above. Figure 33 shows the case in which the first original is fed in reverse, Figure 33 shows the case in which the final original is ejected in the normal direction, Figure 34 shows the case in which the last original is ejected in reverse, and Figure 35 shows the normal ejection and normal feeding operation of the original. In case, the third
Figure 6 shows the case of normal document ejection/reverse feeding operation, Figure 37 shows the case of original document anti-discharge/reverse feeding operation, Figure 38 shows the case of original document counter/reverse feeding operation, and Figure 39 shows the case of original reversing operation. Each case is shown below.

Although a reflective sensor is used in the above embodiment, a transmissive sensor, micro switch,
It is also possible to use a reed switch or the like.

Also, although the interrupt terminal of the microcomputer is used as a counting means to perform counting by a program, it is also possible to use a hard logic circuit using a counter IC.

In addition, the configuration uses a switching means to select one clock and inputs it to the interrupt terminal, but the switching means can be removed and all clocks are put into the input port, and the switching can be done using a microcomputer program. This objective can also be achieved by counting the

Further, although the clock signal is generated by driving the conveyance means, it may be generated by a pulley or the like that rotates as the document is conveyed.

Effects As explained above, according to the present invention, the ejection mode is determined based on the mode selection signal each time the original is ejected at the exposure position, and the ejection mode for the next original is determined before the start of the ejection operation for the original at the exposure position. Decide the feeding mode,
By performing the ejection operation of the original at the exposure position and the feeding operation of the next original in parallel according to the determined ejection mode and feeding mode, the original can be replaced quickly.

Furthermore, the feeding mode and ejection mode of the same original can be determined independently at different times. For example, when copying the front and back sides of a double-sided original (back
When copying paper is jammed after the front side of the document has been exposed, the document must be fed so that the back side of the document is exposed when copying resumes after the jam has been cleared. There is no need to provide a separate feeding mode for the recovery process, and the recovery process can be easily performed by simply selecting the first normal feeding mode.

Further, even if a document feeding jam occurs during document feeding for surface exposure of a double-sided document, recovery processing can be similarly easily performed.

That is, flexible document conveyance is possible with a simple configuration, and the operational efficiency and operability of the document feeding device are also improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a copying device consisting of a double-sided original circulation device, a double-sided copying machine, and a sorter, Figures 1-2 are views showing the paper output tray, and Figure 2 is a rear cross-section showing the drive system of the double-sided original circulation device. Figures, 3rd to 7th, 8-1, 8-
2,9-1,9-2,10-1~10-3,1
1, 12-1, 12-2, 13-1 to 13-3 are diagrams showing the state of the original or copy paper, FIG. 14 is a diagram showing the control circuit of the copying machine shown in FIG.
Figure 5 is a diagram showing the circuit configuration of the line receiver.
Figure 6 is a diagram showing the circuit configuration of the line driver, Figure 17 is a diagram explaining the serial transfer method,
Fig. 18 is a timing chart of each signal of serial data for each operation of the double-sided original circulating device and the copying machine main body, Figs. 19-30 are control flow charts of the double-sided original circulating device, and Figs. 31-39 are a double-sided original circulating device. 2 is a timing chart in each operation mode. In the figure, A is a double-sided original circulating device, B is the copying machine main body, C is a sorter, 1 is an original placing table, 8 is a belt, 13 to 20 are sensors, 21 is a pulse motor,
22 is a partition arm, 80, 82, 97 are motors, 85 is a clutch, 92 is a brake, 93, 1
03 is a clock disk, 95 and 105 are photoelectric sensors, 107 is a switching solenoid, and 120 is a microcomputer.

Claims (1)

[Scope of Claims] 1. A document feeding device connectable to an exposure device that exposes documents, comprising: a stacking section for stacking documents; and a first conveyance path for transporting one document stacked on the stacking section. a conveying means for feeding the original document to the exposure position of the exposure device and then ejecting the original document at the exposure position to the stacking section via a second conveyance path; and reversing the front and back sides of the original document conveyed by the conveyance means. reversing means; a first feeding mode in which the document in the stacking section is reversed front and back by the reversing means and fed to the exposure position; and a first feeding mode in which the document in the stacking section is fed to the exposure position without reversing the document front and back. a second feeding mode in which the document at the exposure position is reversed from front to back by the reversing means and then discharged to the stacking section; and a first discharge mode in which the document at the exposure position is loaded without being reversed front to back. and a second ejection mode in which the transport is carried out in one of the first and second feeding modes and in one of the first and second ejection modes. and a control means for controlling the operation of the reversing means; and an input means for inputting a mode selection signal for selecting a feeding mode and an ejection mode output from the exposure position, and the control means has the following: determining a discharge mode based on a mode selection signal input to the input means each time the conveying means discharges the document at the exposure position;
In addition, before starting the ejection operation of the original at the exposure position, the feeding mode of the next original is determined, and the ejection operation of the original at the exposure position and the feeding operation of the next original are performed according to the determined ejection mode and feeding mode. A document feeding device characterized in that operations are performed in parallel.