JPH0731426B2 - Document feeder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a document feeder for feeding a document to a predetermined position.

2. Description of the Related Art A document feeding device for automatically feeding a double-sided document to an exposure position of a copying machine is known. However, since such a document feeding device feeds the next document after discharging the exposed document, the efficiency of document replacement is poor and the productivity is poor.

The present invention has been made in view of the above points, and an object of the present invention is to handle single-sided originals and double-sided originals.
An object of the present invention is to provide a document feeding device that can quickly exchange documents.

That is, according to the present invention, a feeding unit that feeds a document to an exposure position, a discharging unit that discharges the document at the exposure position from the same side as the document feeding side along a discharge path, and In the case of the first mode in which a document is once discharged from the exposure position, the discharge path is also used to reverse the front and back of the document and the document is fed again to the exposure position, and the first mode in which one side of the document is exposed, The document is fed to the exposure position by the feeding unit, the document is ejected from the exposure position by the ejecting unit after the exposure is finished, and the next document is ejected by the feeding unit while the exposed document is ejected by the ejecting unit. In the second mode in which feeding is started and both sides of the document are exposed, the document is fed to the exposure position by the feeding unit and inverted by the reversing unit to the exposure position without performing exposure. Feed the original By reversing the original by the exposure after the end of the inverting means of the surface is fed to the exposure position, the original second
A control unit that causes the discharge unit to discharge the document from the exposure position after the exposure of the surface is finished, and causes the feeding unit to start the feeding of the next document while the discharge unit discharges the exposed document. In the second mode, the control means temporarily suspends the reversing operation of the next original after the next original is fed to the exposure position by the feeding means, thereby performing the reversing operation. The document feeding device is characterized in that it is performed after the exposed document is discharged by the discharging means.

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

The copying apparatus of this example is roughly classified into a double-sided document circulating apparatus A.
And a sorter C that sorts copy sheets, and a double-sided document circulation device A is disposed on the top plate of the casing of the copy machine main body B.

(1) Double-sided document circulation device A 1 is a document table, 2 is a paper feed belt drive shaft, 2a is a paper feed belt driven shaft, and a paper feed belt 3 is hung between them, in the direction of arrow C in the figure. Is rotating. 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.
The sheet feeding belt 3 and the separation belt 5 separate a plurality of sheet-shaped stacked originals placed on the original placing table 1 one by one from the bottom. Reference numeral 6 is a transport roller, and 6a and 6b are rollers that are in pressure contact with the transport roller 6, respectively. Further, 9,10,11 are conveying rollers, and 9a, 10a, 11a are rollers which are in pressure contact with the rollers 9,10,11, respectively. Further, 7 is a conveyor belt drive roller located on the left side of the platen glass 12 disposed on the upper surface plate of the main body of the copying machine, and 7a is a conveyor belt driven roller located on the right side of the platen glass 12 between them. A belt 8 is attached to the. 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.
Numerals 13 to 18 are reflection type photosensors for detecting the leading edge or the trailing edge of the document, which are arranged at required places in the document circulation path (paper path). Further, 20 is a reflection type optical sensor ES for detecting a document placed on the document placing tray 1, 19 is a reflection type sensor (recycling sensor) RS for detecting one circulation of the document stack,
The partition arm 22 is stopped to rotate on the document stack by the pulse motor 21, the recycle sensor RS19 is turned on at that time, and then the document is separated and fed from the bottom document and the trailing edge of the final document passes through the partition arm 22. The partition arm 22 has a mechanism to be turned off by its own weight, passing through the position of the recycle sensor RS19.

(2) Copying machine main body B 12 is a platen glass, 30 is a photosensitive drum which is rotationally driven in the direction of the arrow about the shaft 30a, 31 is a charger, 32 is a developing device, 33
Is a transfer charger, and 34 is a cleaner. Reference numeral 35 is a cassette for stacking copy paper, 36 is a paper feed roller for feeding the copy paper in the cassette one by one, 37 and 37a are register rollers, and 38 is a copy paper after transfer to the fixing devices 39 and 39a. It is a conveyor belt. 40 is an intermediate tray for storing copy paper after one-sided copying, 41 and 41a are drive shafts and driven shafts of the paper feeding belt 42, and 43 and 43a are drive shafts and driven shafts of the separation belt 44, which are stored in the intermediate tray 40. It also has a mechanism to re-feed copy paper from the bottom. Further, 45 and 45a are paper discharge rollers for feeding the paper after copying to the sorter C, or, if the sorter C is not connected, discharge the paper to the paper discharge tray 46 as shown in FIG. 1-2.

(3) The sorter C 60 is a conveying roller, and 60a is a pressure contact roller for feeding the copy paper fed from the copying machine main body B into the bins 61a to 61o. 62 is a fixing plate for the bottles 61a to 61o, and the notch groove 63
The bins 61a to 61o and the fixed plate 62 are integrally formed, and are connected to the chain 64 by a spring 65, and the power is transmitted by the rotating rollers 67 and 67a fixed to the shaft of the motor 66. It is configured to be movable up and down. 68 is
It is a photoelectric sensor that detects the bin position from 61a to 61o.
By detecting the notch groove 63, the bottle corresponding to the outlet is determined. Further, 69 is a photoelectric sensor for detecting the trailing edge of the copy paper sent from the copying machine main body B, and waits until the copy paper is completely stored in the bin after detecting the trailing edge of the copy paper. The movement is started, and when the next notch groove is detected by the photoelectric sensor 68, the movement of the bin is controlled to be stopped. In this way, the copy sheets sent from the main body B during copying can be sequentially stored in the respective bins for sorting.

(4) Drive system of double-sided document circulating apparatus A FIG. 2 is a schematic cross-sectional rear view showing the drive unit. In the figure, reference numeral 80 is a motor M ₂ , and 81 is a motor gear for transmitting the driving force to the paper feed belt drive shaft 2 and the separation belt drive shaft 4 through a gear 96. Reference numeral 82 is a motor M1, 83 is a motor pulley, 86 is a two-stage pulley, and the drive transmission from the belt 87 to the belt 88 is performed by the electromagnetic clutch CL85. Also, 89 is a two-stage pulley, which is integrated, and transmits the driving force from the belt 88 to the belt 90.
As a result, the driving force is always transmitted to the driving roller 7 of the conveyor belt 8 through the pulley 91. Further, 93 is a disc having a two-stage pulley 89 and a notch groove 94 for rotating one body, and a photoelectric sensor 95
Thus, the movement amount of the belt 8 can be detected. Reference numeral 92 is an electromagnetic brake BK, which enables the belt 8 to be stopped instantaneously when turned on.

Also, 97 is a motor M ₃ , 98 is a gear, 99 is a pulley, 100, 101,
A belt 102 transmits the driving force to the conveying rollers 6, 9, 10, 11. Further, 103 is a notch groove 104 which is rotated by one with the pulley 99.
It is a disk with
It is possible to detect the rotation amounts of 0 and 11, that is, the amount of conveyance movement of the document. Further, numeral 23 is a switching claw, and the solenoid SL107 switches whether the original on the platen glass 12 is conveyed toward the conveyance roller 6 or the conveyance roller 9 by the fulcrum 106.

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

(1) Single-sided original-single-sided copy (without sorter) 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, which are separated and fed one by one from the lowermost part, 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 trailing edge of the document is detected by the sensor 14 (S ₂ ), the counting of the number of the cutout grooves 94 of the disc 93 (FIG. 2) is started from that point, and the motor M182 is turned on after counting a predetermined count. The clutch CL85 is turned off, the brake BK92 is turned on, and the rotational drive of the conveyor belt 8 is instantaneously stopped. As a result, the original is automatically set to the predetermined set position on the surface of the platen glass 12 at the set position. Further, the sensor 13 (S ₁ ) (FIG. 1-1) detects whether or not the document is normally separated. The sensor 13 (S ₁ ) detects the document within a certain time after the start of separation and conveyance. If not, the document is judged to have been jammed and the conveyance is stopped.

When the original is positioned on the platen glass 12 in this manner, a paper feed completion signal (described later) is sent to the copying machine main body B to start the copying operation, and a toner image corresponding to the image of the original is formed on the photosensitive drum 30. Formed on. Further, one copy sheet is fed from the cassette 35 by the sheet feed roller 36, and the paper path Ib
After passing through, the toner image is transferred onto the upper surface by the charger 33, passes through the paper path IIb, passes through the fixing rollers 39 and 39a, passes through the paper path VIIIb, and is discharged to the paper discharge tray 46.
On the other hand, the exposed document is ejected through the paper paths VIIa and VIa after the exposure of the document by the halogen lamp 46 and the optical mirrors 47a, 47b, 47c and 47d is completed once. 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. The sensor RS19 detects one circulation of the set originals by sequentially performing the normal feeding and normal feeding operation, and sends a cycle end signal (described later) to the main body B during copying to count one copy. The above operation is repeated until the set number of copies is reached, and the required number of copies are stored on the paper discharge tray 46.

(Ii) Single-sided original-single-sided copy (with sorter) (i) Single-sided original-single-sided copy (without sorter) described in the previous section.
When the sorter C is installed, the normal discharge operation is performed every exposure of one original document when the sorter C is not provided. The original document exposure of a certain original document is performed several times for copy setting, and the sequentially ejected copy sheets are stored while bin-shifting from bins 61a to 61o of the sorter C. That is, since the sorter C is provided, the circulation of the document can be performed once and the set number of copies can be made.

(Iii) Double-sided original-double-sided copy (without sorter) If there are three originals on the original placing tray 1, the originals placed on the original placing table 1 will be in the page order as shown in FIG.
Assuming that the desired number of copies is three, the copy sheets after copying are stacked on the discharge tray 46 as shown in FIG.
Also, the state of placing the original document is the same as the state in which it is initially set as shown in FIG. These operations will be described. First 5th and 6th
The page document is conveyed to the platen glass 12, the motors M1 82 and M3 97 (Fig. 2) are then reversed, and at the same time, the solenoid SL107 is turned on to switch the paper ejection route, and the document passes the paper paths IIIa and IVa. It is gripped and conveyed by the passing conveyance rollers 9 and 9a. If sensor S517 detects the trailing edge of the document, motor M397 is stopped. After a lapse of a certain time, the motor M397 is rotated in the normal direction, and the document passes through the paper paths Va and VIa and is transported by the transport rollers 10, 10a, 11, and 11a. If sensor S618 detects the trailing edge of the document, motor M
3 97 is stopped, and after a certain period of time, motor M3 97 is reversely rotated again, motor M1 82 is normally rotated, and solenoid SL23
When turned on, the document passes through the paper path VIIa and is gripped by the belt 8 and conveyed. When the rear edge of the document is detected by the sensor S315, the cutout groove of the disc 93 (Fig. 2) is detected from that point.
Start counting the number of 94, and after counting the predetermined number of counts, the motor M1 82 turns off, the clutch CL85 turns off, and the brake BK9
2 is turned on, the rotational drive of the conveyor belt 8 is instantaneously stopped, and the original 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, a paper feed completion signal is sent to the copying machine main body B. In the main body B of the copying machine, the original image is copied onto the copy paper in the same manner as the above operation, but the copy paper ejected from the fixing rollers 39 and 39a has the switching pawl 48 switched, so
It passes through IIIb and is placed on the intermediate tray 40 as shown in FIG. On the other hand, as with the completion of the exposure of the original on the sixth page, the pulling and repeating operation for positioning the fifth page of the original downward on the platen glass 12 is performed through the paper paths IIIa, IVa, Va, VIa, VIIa. (This operation is hereinafter referred to as a pull repetition operation). After that, the paper feed completion signal is sent again to the copying machine main body B, the copying operation for the fifth page is performed, and the image on the sixth page of the copy paper placed on the intermediate tray 40 is copied to the back side of the copy paper. The image on the fifth page is copied, and the image on the fifth page is discharged onto the discharge tray 46 with the image facing upward. Also, platen glass
The document on 12 passes through the paper paths VIIa and VIa and is discharged by the transport rollers 11 and 11a onto the document placed on the document table 1 with the fifth page facing upward (this operation will be referred to as normal discharge operation hereinafter). Called). From a certain time during the normal discharge operation, the above-described anti-feeding operation of the next original having the fourth and third pages is performed in parallel with the normal discharge 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-mentioned copying operation is performed a necessary number of times, and finally the copy paper is discharged onto the discharge tray 46 as shown in FIG. 4, and the original is placed on the original without changing the initial set state as shown in FIG. Table 1
The two-sided copy is completed from the two-sided original.

(Iv) Double-sided original-double-sided copy (with sorter) The operation is almost the same as the case of the double-sided original-double-sided copy (without sorter) described on the previous page. However, in the case where the sorter C is not provided, the normal discharge / feed operation is performed every time the original is exposed to the original, whereas when the sorter C is installed, the original exposure is performed in the copy setting number. It is carried out once, stored once on the intermediate tray 40 as shown in FIG. 6, then re-fed, copied on the side opposite to the image side, sorted by the sorter C, and stored sequentially. Finally, copy paper is stored in the sorter C as shown in FIG.
Also, the original document is discharged in the same state as the final set as shown in FIG. 3, and the entire process copying is completed.

(V) Single-sided original-duplex copy (without sorter) When the number of originals placed on the original placing table 1 is n, the lowermost original is O _n , and the uppermost original is O ₁ , FIG. 8-1 or FIG. 8-
There are two possible document set states, depending on FIG. 2, that is, whether n is an odd number or an even number. First, the case where n is an even number will be described.
First excisional the platen glass 12 and the document O _n in Seikyu operation in the first 8-1 Figure performs Seihai positive feed operation while taking a copy paper copied the original O _n in the intermediate tray 40, the document O _n
And O _n-1 to exchange the original. Next, the original O _n-1 is not copied, and the original is exchanged with the next original O _n-2 by the normal discharge and normal feeding operation. Perform copying the original O _n-2, the while taking a copy paper in the intermediate tray 40, similarly next document O _n-3 and original O _n-3 a platen glass 12 performs document exchange Seihai positive supply operation To set. At this time, _{if the On-3} original is the first page original, the partition arm 22 is detected by the sensor RS19,
The main body B of the copying machine receives the cycle end signal from the double-sided document circulating device A, and judges that the number n of documents is four, which is an even number. For O _n-3 , the original document O _n is replaced by the normal discharge and normal feed operation without copying the next original document O _n.
To the platen glass 12. At this point, the original and copy paper are in the states shown in FIGS. 9-1 to (3).

Then, the copy of the original O _n is skipped, the original is exchanged with the original O _n-1 by the normal discharge and normal feeding operation, the original O _n-1 is set on the platen glass 12, and the original O _n-1 is copied. Copy the intermediate tray
The original O _n−1, that is, the third copy sheet, which is fed from the bottom of the copy sheets copied on one side of the stack 40, that is, the reverse side of the copy sheet on which the fourth page is copied, The page is copied and discharged onto the discharge tray 46. Thereafter, the same operation as described above is repeated, and the original O _n-2 is copied and the original O
The copy of _n-3 is made on the opposite surface of the copy paper on which the second page of the intermediate tray 40 is copied, and one copy of double-sided copy paper is discharged as shown in FIG. 10-1. Then, the copy operation for one copy is repeated a set number of times. If the set number of copies is set to 3, finally, the copy paper is in the state shown in FIG. 10-2 and the original is in the initial set state shown in FIG. 8-1 to complete the copy operation.

Next, a case where the number n of originals is an odd number will be described. 8th-
In FIG. 2, the original O _n is copied to the intermediate tray 40, the original O _n-1 is skipped, and the original O _n-2 is copied to the intermediate tray 40 as in the case where the number of originals n is even. , The original O _n-3 is skipped, the original O _n-4 is copied, and the operation to the intermediate tray 40 is repeated, but the copying machine main body B does not operate while the originals O _n-3 and O _n-4 are being exchanged. Based on the cycle end signal from the double-sided document circulating device A, it is determined that the number of documents n is 5, which is an odd number. Then, the original O _n-4 and the next original O _n are exchanged, and the original O _n is set on the platen glass 12. At this point, the original and copy paper are in the states shown in FIGS. 9-2 (1) to (3). Next, skip the copy operation of the original O _n ,
The original is exchanged by the normal feeding and normal feeding operation with the next original O _n-1 . At the same time as this exchange, the copy paper on which the fifth page has been copied on the intermediate tray 40 passes through the paper paths VIb, IIb, IIIb and is again returned to the intermediate tray.
Placed on top of 40 copy papers. Next, the copy of the original O _n-1 is made on the reverse side of the copy paper on which the third page is copied on the intermediate tray 40, and again on the intermediate tray 40 in the same manner as the circulation path of the copy paper on the fifth page. Put it on the top of the copy paper. Simultaneously with this circulation, the original O _n-1 and the next original O _n-2 are exchanged, and the original O _n-2 is set on the platen glass 12. Then, the copy operation of the original O _n-2 is skipped, and the original O _n-3 is copied.
Is copied to the reverse side of the copy paper on which the first page is copied on the intermediate tray 40, and then the original O _{n-4 is transferred} to the intermediate tray 40 again.
The copy operation is skipped. The copy paper at this point is in the state shown in FIG. 10-3. After that, the copy paper on the intermediate tray 40 is sequentially conveyed from the lowermost part, and the paper paths VIb, IIb,
A part of the double-sided copy is discharged onto the discharge tray 46 through VIIIb. After that, the above operation is repeated as many times as necessary for the set number of copies. If the set number of copies is set to 3, finally,
The copy paper is in the state shown in FIG. 11 and the original is in the initial set state as shown in FIG. 8-2, and the copy is completely completed.

(Vi) Single-sided original-double-sided copy (with sorter) (v) Single-sided original-double-sided copy (without sorter) described in the previous section.
When the sorter C is installed, the normal discharge operation is performed every exposure of one original document when the sorter C is not provided. Original exposure for a certain original is performed several times for copy setting.
When the number of originals is four as shown in FIG. 8-1 and the copy setting number is three, the copy paper on which the even pages are copied is temporarily stocked on the intermediate tray 40 as shown in FIG. 12-1. Then, the sheets are fed from the lowermost portion to perform the odd page copying operation, and are stored in the sorter C as shown in FIG. 12-2 to complete the copying operation. If the number of originals is set to 5 as shown in FIG. 8-2 and the copy setting number is set to 3, the copy paper on which odd pages are copied is temporarily stored on the intermediate tray 40 as shown in FIG. 13-1. To do. Then, the paper is fed from the lowermost part to perform an even-numbered page copying operation, and is again put in the intermediate tray 40 as shown in FIG. 13-2,
Next, the copying operation is not executed and the sheet is sent to the sorter C, and finally stored in each bin of the sorter as shown in FIG. 13-3 and the copying is completed.

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

FIG. 14 is a schematic diagram of a control circuit for performing the sequence operation described above. In the figure, the double-sided document circulating device A, the copying machine main body B, and the sorter C are indicated by dotted lines, respectively. Signals are exchanged between the A, B, and C devices by the cable 12 between the A and B devices.
2, B, C are serially transferred via a cable 121 (described later). 123a, 123b, 123c, and 123d are line receivers for receiving serial signals, and they are full-time TTL.
, And has a circuit configuration as shown in FIG. or,
124a, 124b, 124c, 124d, 124e, 124f, 124g, 124h, 124i, 124j
Is a line driver for serial signal transmission and uses a driver TTL and has a circuit configuration as shown in FIG. 120
Is a well-known one-chip micro computer (hereinafter referred to as a microcomputer) having a built-in ROM, RAM, etc., which can be used, for example, by μ-COM43N manufactured by NEC Corporation. The microcomputer 120 is supplied with 5V power from the DC power supply 125, so that the internal program can be executed. Input port I of microcomputer 120
₁ ~I _10, each sensor signal, the signal of the microswitch MS126 operating when opening the duplex document circulation apparatus A from the front side, the request signal REQ, etc. from the copying machine main body B inputs. In addition, the sensor 105 (second
Transport clock output from the figure and sensor 95 (second
One of the belt clocks output from the figure) is input from the circuit composed of AND gates Q ₁ and Q ₂ , OR gate Q ₃ , and inverter Q ₄ . Transport clock, switching of Berutokurotsuku the output ports O ₁₃ switching signal CS1 outputted from
Performed by 27. The output port O _1, O _2, O ₅ to ~ O ₁₁ are connected to the driver D ₁ to D _11, the driver D ₁
Each load can be driven via ~ D ₁₁ . Also, O ₁₂
Is an output port for outputting an acknowledge signal ACK sent to the copying machine body B. Also, a driver that includes an electric brake
128 has M ₃ CW signal and M ₃ CCM from output ports O ₃ and O ₄ , respectively.
A signal is input and the rotation of the carry motor M3 is controlled. Also, 129 is an electric brake circuit, and M is output from the output port O _5.
When the 2 signal turns off, the separation motor M2 turns off and the electric brake is applied instantly.

Next, the above-mentioned serial method will be described. FIG. 17 (1) is a timing chart of serial transfer. The request signal REQ is constantly transmitted from the copying machine main body B at a certain interval time. Signal REQ is microcomputer 120
Input to the input port I ₁₀ of the two-sided document circulating device A, the output signal from the output port O ₁₂ of the microcomputer 120 of the double-sided document circulating device A is acknowledged.
The serial data Si from the copying machine body B and the serial data SO from the double-sided document circulating device A are output in synchronization with the clock signal SCK output from the copying machine body B to the input port ▲ ▼ of the microcomputer 120. 8 bits are transferred per request. The detailed timing is the same as the serial transfer of μ-COM43N, so it is omitted.

The field FLDi1 shown in FIG. 17 (2) is the 8-bit data sent to the double-sided document circulating device A, the bit 7 is the field designation bit, and the "0" bit 6 is always the feeding of the document of the copying machine body B. Paper, original feeding signal for changing, bit 5 is an original ejecting signal for ejecting the original only at the time of JAM of the copying machine main body B, at the end of final exposure, etc., bit 3
~ 0 is the above-mentioned document normal discharge normal supply, normal discharge reverse supply, anti-discharge normal supply,
This is an operation command signal for performing each operation of anti-discharging / recharging and pulling repetition. For example, in anti-discharging normal feeding operation, bits 3 to 0 are 0.
It becomes 0.1.0. Also, the field FLD0 shown in FIG. 17 (3)
1, FLD02, FLD03 are 8 bits each sent to the copying machine body B,
With a total of 24 bits of data, each bit 7 and 6 has a field designation bit, and each field can be discriminated. Bit 5 of FLD01 is an original feeding completion signal which is turned on when the fed original is set on the platen glass 12 (FIG. 1), and bit 4 is turned on when an original feeding signal from the copying machine body B is received. The in-operation signal, bit 3, is a driving signal which is turned on while the double-sided document circulating device A is executing the document conveying sequence, particularly while a heavy load such as a motor is on.
This signal is for suppressing the maximum power consumption of the entire system including the copying machine main body B. For example, while this signal is on, the halogen lamp in the fixing device 39 of the copying machine main body B is turned off. It becomes possible by doing. Bit 2
.About.0 are original size signals detected by sensors 13 and 14 during the transportation of the original from the original placing tray 1 to the platen glass 12. For example, in A4, bits 2 to 0 are 0,
It becomes 0, 1 and is transmitted to the copying machine main body B almost at the same time as the document feeding completion signal. Further, the bit 5 of the FLD02 has a partition arm 22 in which the last document is sent out in one circulation of the document and the cycle end sensor RS19 (FIG. 1) is rotated by its own weight.
This is a cycle end signal that is turned on by detecting (Fig. 1). Also, the bit 4 is the original placing table 1 (FIG. 1).
The following shows the state of the document detection signal that turns on when a document is placed in.
Bits 3 to 0 of FLD02 and bits 3 to 0 of FLD03 are original number signals for transmitting the number of recognized originals at the same time when the cycle end of the original is detected. The FLD02 side is higher and the FLD03 side is lower. It is represented by a binary number and if it is 20 decimal numbers, FLD02 bits 3-0, FLD03 bits 3-0
0 is 0,0,0,1, 0,1,0,0, respectively. Bit 5 of FLD03 is a JAM signal generated when a document conveyance error occurs in the double-sided document circulation device A, and bit 4 is an opening / closing micro switch M.
This is a door open signal issued when S126 (FIG. 15) is activated, that is, when the double-sided document circulating device A is opened. This signal is for copying an original document that cannot be used by the double-sided document circulating device A, for example, a book, and if there is this signal, a document feed signal is sent to the double-sided document circulating device A when the copy button of the copying machine body B is pressed. Instead, the copying operation of the copying machine body B is started.

FIG. 19 shows a double-sided document circulation device (RDF) A and a copying machine body B.
3 is a timing chart showing the timing of each signal of the serial data described above with respect to each operation 135 of FIG. 136 is a serial signal sent from the copier body B to RDF A, 1
37 is a serial signal sent from the RDF A to the copying machine main body B, 1
38 shows the sequence in RDF A. In this example, one copy is taken from two originals and the RD is used when the second original is ejected.
Jam is occurring in F.

Next, the operation of the RDF will be described with reference to the control flow chart shown in FIGS. 19 to 30 and the timing chart shown in FIGS.

FIG. 19 is a main flow chart for performing the above-mentioned RDF operation sequence. In Step 201, the initial reset operation is performed when the power is turned on, each output port is turned off, and the RAM area inside the microcomputer 120 is cleared. Then, the counters, timers, commands, etc. described later are cleared. Next Step 202
Then, judge whether it is JAM, and if it is JAM, Step 2
At 05, proceed to JAM RESET SUB and wait for JAM RESET. If not JAM, proceed to the next Step 203. In Step 203, it is determined whether or not the door of the section A is open. If it is open, the sequence operation is ignored and the process proceeds to Step 208. If it is closed, it is normal and the process proceeds to the next Step 204. In Step 204, SEQU
Go to ENCE CHECK SUB. This is a routine for performing the operation sequence of the RDFA unit, and details will be described later. Next Step 206
This is a routine that increments each timer started in Step 204, and Step 207 judges whether or not there is an input to the INT terminal to which either the transport clock or the belt clock is input, and if there is, the above-mentioned Step Each counter started in 204 is incremented by one. Step
Reference numeral 208 is a routine for proceeding to SIRIAL CHECK SUB and performing an operation sequence for performing the above-mentioned serial transfer with the copying machine main body (B section). If the main flow is normal, Step 2
After processing 02, 203, 204, 206, 207, and 208, it returns to Step 202 again and draws a loop.Each SUB routine is called by the CAL instruction of the microcomputer, and RET after processing is completed.
It is configured to return with an instruction and proceed to the next step.

FIG. 20 is a detailed flow of SEQUENCE CHECK SUB in Step 204 described above. Step 211 will be described later Check whether or not is set, and if it is set, it is determined that the sequence operation is in progress, and the process proceeds to Step 214. If it has not been set, the process proceeds to Step 212 where an operation start command from the copying machine main body B is waited for. In Step 212, if either of the above-mentioned serial data (original paper feed signal) or (original paper discharge signal) is set, the operation proceeds to Step 213 to start the operation. However, the (original paper ejection signal) is accepted only when the (original paper feed completion signal) is set, that is, when the original is fed onto the platen glass 12 of the copying machine and the copying operation is being performed. Notify the main body by setting the current contents of the [Document counter] in the [Document number signal]. If neither of the above has been set, proceed to RET and SEQUENCE CHEC
K SUB enters the waiting state. Next, Step 213 will be described. Ste
p 213 specifies the operation mode of sequence operation,
This is a step for starting the operation. First, since the change of the operation mode is prohibited from the start of the operation to the end of the copying operation of the copying machine main body B, the operation mode is determined only at the start of the operation. Step 213 during operation.
I'm trying to ignore. Further, in Step 213, the copy operation of the main body B of the copying machine, which is serial data, is reset (original feeding completion signal), the start of operation is notified (in-motion signal) is set, and the original circulation is completed. In this case, the (cycle end signal) output in this case is reset. And described later Is set and a paper feed operation start command is issued. Further, the content of the operation mode signal (operation command signal) designated from the copying machine main body B is stored in the table counter (MDCN), and the next step
Continue to 214. In Step 214, the flow branches depending on the contents of the table counter (MDCN) described above, and when (MDCN) = 0, the normal discharge normal pay mode processing is performed to advance to the normal discharge normal pay SUB. Discharge and discharge SUB, (MDCN) = 2, counter discharge and correct supply SUB, (MDCN) = 3, counter discharge and supply SUB, (MDCN) = 4
Then, repeat to SUB. In this case, when starting operation Step 21
In step 3, the operation mode is specified, the contents of the table counter (MDCN) are determined according to that mode, and in step 214, the processing routine is advanced to each mode depending on the contents of the table counter (MDCN). Paper feed and copy operation by the normal feeding operation, the mode designation is changed at the start of the next operation, and if the anti-ejecting and anti-feeding operation is specified, the first document is ejected in the anti-ejecting mode, The first original is fed in the anti-feed mode, so that the next operation mode can be changed at the start of the operation by the contents of the (operation command signal) of the copying machine main body.

FIG. 21 is a SUB routine for performing the discharge / feed operation according to the operation command defined in FIG. Step 221
Is a routine for normal discharge normal supply operation.
The sequence operation is advanced by sequentially performing B, regular feed SUB, and paper feed completion SUB, and performing paper ejection, paper feed, and paper feed completion processing in parallel within each SUB routine. Similarly, in step 222, normal discharge / reverse supply operation is performed, in step 223, reverse discharge normal supply operation, in step 224, reverse discharge / recharge operation, and in step 225, pull repeat operation is performed. In each of Steps 221 to 224, the set of the document discharge signal is judged, and if it is set, only the discharge operation is performed, and in Step 225, the operation is prohibited. In each of Steps 221 to 224, the sheet discharging operation is started, but if there is no document to be discharged on the platen glass 12 of the copying machine, the sheet is not discharged.

Next, using the case of two originals for the normal discharge and normal feeding operation,
Normal supply SUB in the figure, normal discharge SUB in Figure 25 and paper feed complete SU in Figure 27
This will be described in detail with reference to B's flow chart.

Now, a stack of two originals is placed on the original placing table 1, the normal discharge normal supply mode is designated by the copying machine main body B, and the original supply normal feeding operation is started by setting the original document feeding signal. Since the normal feeding of the first original is Step 231 in the normal feeding SUB of FIG. 22, the sensor ES (FIG. 20 in FIG. 1-1) detects the original, and the paper feed permission command is set in Step 213 described above. , Reset the paper feed permission command to perform only the normal feeding operation, reset the reversal permission command, set the feeding instruction, and issue the prohibition command for other operations. Further, the sensor S1 (see FIG. ) To JAM
Start the timer [JTM] to separate motor M2 (1st-
Turn on (Fig. 80, 1) to start document separation and set "1" to the table counter [iNCN] to proceed to Step 232.
Each step branches according to the contents of the table counter [iNCN], the table counter [iNCN] is updated as the operation sequence progresses, and the steps are sequentially processed. Further, other table counters described later also perform the same operation. Next, in Step 232, it is monitored whether or not the leading edge of the separated document is detected by the sensor S1 until the JAM timer [JTM] expires, and if the time is up, it is determined that the separation is defective and JAM RE
Go to SET SUB. If it is normal, the leading edge of the document traveling on the conveyance path Ia is abutted against the rollers 6 and 6a, and the timer [TM1] is started to make a loop, and the table counter [iNC
N] ← 2 and proceed to the next step. In Step 233, waiting for the end of the timer [TM1], the motor M2 is turned off to form a loop, and the loop stabilization timer [TM2] is started,
Set the table counter [iNCN] ← 3 and proceed to the next step. St
In ep 234, the signals M3CW, M1CW, CL, SL output from the output ports O ₃ , O ₆ , O ₈ , O _{10 of} the microcomputer 120 are turned on while waiting for the end of the loop stabilization timer [TM2], and the original document is turned on. The conveyance is started, a discharge permission command described later is set, the JAM counter [JCN1] up to the sensor S2 (FIG. 1-1, FIG. 14) is started, the table counter [iNCN] ← 4 is set, and the process proceeds to the next step. In step 235, the sensor S2 monitors whether or not the leading edge of the document is detected until the JAM counter [JCN1] is finished. If the count is counted up, the delay JAM is proceeded to the JAM RESET SUB.
If it is normal, start the JAM counter [JCN2] until the document comes out of the sensor S2 to detect the jammed JAM at the time of detection, and then start the [Document Size Counter] to start the document size detection. Then, set the table counter [iNCN] ← 5 and proceed to the next step. In Step 236, the sensor
It is monitored whether S1 detects the trailing edge of the document, and if detected, the counter [CN1] that counts the number of clocks corresponding to the distance from the sensor S1 to the rollers 6 and 6a is started, and the table counter [iNCN] ← 6. And In Step 237, the signal CS output from the output port O ₁₃ is turned on while waiting for the end of the counter [CN1], and then the table counter [iNCN] ←
7 This is because when the original is straddling both the rollers 6 and 6a and the belt 8, it becomes equal to the conveying speed of the rollers 6 and 6a, so that each counter is added to the conveying clock output by the disc 104 and the photoelectric sensor 105. However, after the trailing edge of the original has come out of the rollers 6 and 6a, the conveying speed of the belt 8 becomes equal to that of the original, so that it immediately depends on the belt clock output by the disc 94 and the photoelectric sensor 95. . Therefore, at the end of the counter [CN1], that is, when the trailing edge of the document passes through the rollers 6 and 6a, the clock interrupt terminal
By turning on the switching signal CS for controlling the input to INT, the clock is switched from the transport clock to the belt clock, and the control can be continued without changing the correspondence of the transport distance to the clock. In Step 238, it is determined whether the sensor S2 detects the trailing edge of the document. JAM counter [JCN
2) is monitored until it finishes, and if you count up
As AM, proceed to JAM RESET SUB, and if it is normal, immediately detect the trailing edge and stop the [original size counter] to end the original size detection, and at the same time, place the original on the platen glass 12 of the copying machine body B at the predetermined position IIa. The registration counter [RGCN1] up to is started, and since one original has been conveyed, the [original number counter] is incremented to count the number of originals and the table counter [iNCN] ← 8 is set, and the process proceeds to the next step. In Step 239, the registration counter [RGCN1] is waited until it finishes, and at the time of termination, a signal M3C is issued to accurately stop it at a predetermined position IIa on the platen glass 12.
W, M1CW, CL are turned off, the signal BK is turned on, the feeding instruction is reset, the inversion permission instruction to be described later is set, the table counter [iNCN] ← 0 is set, and the process returns to Step 231 to enter the waiting state. At this point, in step 231, the paper feed permission command has been reset, and the waiting state is entered.

Next, the paper feed completion SUB will be described with reference to FIG. First, the process of Step 281 is performed with the table counter [SETCN] = 0. During the normal feeding operation, the feeding instruction is set, so the feeding completion instruction is set and the waiting state is entered. This is because the waiting condition is released because the feeding instruction is reset in step 239 and the reversing instruction described later is also reset, and the feeding completion instruction is also set, so the brake BK92 on-time timer SU for starting [TM3] and judging the original size from the contents of the [Original size counter] and storing the original size data in the (Original size signal) in the serial data
B Routine SIZECK SUB is processed, the (document feed completion signal) is stored in serial data, a copy start command for the copier body is output, and the copier body that checks it turns off (document feed signal). Then, the copy operation for the first sheet is started. Further, the switching solenoid SL is turned off to perform normal discharge switching of the document transport path, and the table counter [SE
TCN] ← 1 and proceed to the next step. In Step 282, wait for the end of the timer [TM3], turn off the brake BK,
Set the table counter [SETCN] to 2 and proceed to the next step. In Steps 283 and 284, the processing of the partition arm 22 and the pulse motor 21 that detects one circulation of the document stack is performed.
In 283, the sensor detects whether there is a next document on the document table 1.
If the output of ES is judged and if there is no next manuscript, it can be judged that the number of manuscripts is one, so there is no need to perform the processing of the pulse motor 21, and the table counter [SETCN] ← 4
And proceed to Step 285. If there is a next manuscript, check whether [manuscript number counter] = 1, and if it is not "1", it is judged that the number of manuscripts is 2 or more, and the processing of the pulse motor 21 should have already been performed. Same as above Step 285
Proceed to. Since (counter) is currently “1”, it is determined that the original is the first sheet, and the counter [PLSCN] for making one rotation of the pulse motor 21 to start the processing of the pulse motor 21 is started. SETCN] ← 3 and proceed to the next step. In Step 284, the counter [PLSCN] +1 is incremented each time the routine processing is performed once, and the pulse motor 21
If it is off, it is turned on, and if it is on, it is turned off to advance the step angle of the pulse motor one by one, and the counter [PL
When the SCN] is completed, the pulse motor 21 is rotated once, and the table counter [SETCN] ← 4 is set to the next step.
Proceed to. In Step 285, the set of the sheet discharge command is checked so as to wait for the end of the sheet discharge processing at present, and if reset, it is determined that the sheet discharge is completed, and the process proceeds to the next step. Currently it is the first original, so proceed as it is Recycle sensor RS
(19) monitors whether or not it is detected, and since the recycle sensor RS continues to detect it because it is the first original, it is determined that the partition arm 22 still remains on the original, and the original The circulation is judged to be ongoing. However, if there is no detection as described later, it is determined that the circulation of the original document is completed, and the contents of the [original number counter] are stored in the serial data (original number signal) as one set of the original number data, and the original number is stored. Clear the contents of the number counter,
At the same time, the (cycle end signal) is set to notify the copying machine body 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 discharge permission command and the reversal permission command are set, and the table counter [SETCN] ← 0 is entered to enter the waiting state.

At this point, by resetting the start command, the process proceeds to Step 212 in FIG. 20. If the main body of the copying machine is in the process of copying, (original paper discharge signal) and (original paper feed signal) are reset, so RET Return to the waiting state.

Next, the normal discharge / normal supply operation after the copy operation is completed will be described.
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 CALL. In the normal discharge normal feed SUB of FIG. 21, in order to perform normal discharge of the first original document and normal feed of the second original at the same time, the parallel processing of the normal discharge SUB of FIG. 25 and the normal feed SUB of FIG. To do. The normal ejection process for the first original will be described with reference to FIG. When the table counter [EJCN] = 0, the process advances to Step 261 to check whether the discharge permission command is set or not. In this case, Step 234 in the normal pay SUB
Since it has been set at, the paper discharge permission command is reset, the paper feed permission command and the reverse rotation permission command are reset, other operations are prohibited, the paper discharge command is set, and the interval timer [ TM4] is started, the table counter [EJCN] ← 1 is set, and the process proceeds to the next Step. In Step 262, the signal M1C is waited for until the end of the interval timer [TM4].
Turns on W and CL to start the document ejection operation, and eject sensor S3
Start the JAM counter [JCN10] up to (15), set the table counter [EJCN] ← 2 and proceed to the next step. Step 263
Then, the document proceeds along the conveyance path VIIa, and whether or not the discharge sensor S3 detects the leading edge of the document is monitored until the end of the JAM counter [JCN10], and if it counts up, it will be delayed as JAM RESET S
Go to UB. If normal, JAM up to paper ejection sensor S4 (16)
Start the counter [JCN11], set the table counter [EJCN] ← 3, and proceed to the next step. At Step 264, the JAM counter [JCN
11) Monitor until the end and count up to delay JAM
And proceed to JAM RESET SUB. If it is normal, the signals M3CW, M1CCW, CL and CS are turned off at that point to stop the feeding once and stop the first document at a position where it straddles the rollers 6 and 6b and the belt 8. At the same time, the paper feed permission command is set to command the start of the normal feeding operation for the second document, and the Ste
The waiting state of p 231 is released, the feeding instruction is set, and the separation of the second original is started as described above. Furthermore, the interval timer [TM7] is started and the table counter [EJCN] ← 4 is set and the operation proceeds to the next step. In Step 265, the end of the interval timer [TM7] is awaited, and after the end, the waiting state is set until the paper feeding command and the paper discharge permission command are set. In FIG. 22, the normal feeding operation of the second original advances, and Step
At time 234, that is, at the time when the conveyance of the second original is started, the paper discharge permission command is set. Therefore, in step 265, the paper discharge permission command is reset and the sensor S4 is released until the document comes out.
Start the JAM counter [JCN12] and then signal M3CW.
Turn on, start paper ejection operation, and table counter [EJCN] ←
Set to 5 and proceed to the next step. In Step 266, whether or not the sensor S4 detects the trailing edge of the document is monitored until the end of [JCN12]. If it is normal, the conveyance path VIa is advanced and the post-discharge rotation timer [T
Start MOUT], table counter [EJCN] ← 6
And proceed to the next Step. In Step 267, the M3CW signal is turned off, the in-paper discharge command is reset to end the paper discharge operation, waiting for the post-discharge rotation timer [TMOUT] to end. If the paper discharge command from the main body, that is, (original paper discharge signal) has been set, reset the start command shown in Fig. 20 and reset the serial data (in-motion signal) to perform all operations. End and change the table counter [EJCN] ←
Return to Step 261 and wait. When the second original is fed, the feeding completion SUB process shown in FIG. 27 is being continued in parallel with the first original discharging process, and the (original feeding completion signal) is set. , The copier body is making a second copy. Further, since the circulation of the original is completed by feeding the second original, the recycle sensor RS is turned off in step 285, the cycle end signal is output to the copying machine main body, and the start command is turned off. In Figure 20, Step 212
And it becomes a waiting state.

Next, the normal discharge operation of the second original will be described. In this case, since the cycle end signal has been output, the copying machine main body sets the (original paper ejection signal) after the second copy is completed so that only the paper ejection processing is performed. At that time, in the normal discharge normal supply SUB of FIG. 21, only the normal discharge SUB is processed in Step 221.
Regular pay SUB etc. are not executed. The normal discharge SUB processing is sequentially performed from Step 261 to 267 in FIG. 25, and the operation is ended because the (original paper discharge signal) is set as described above in Step 267, and the start command and (in-motion signal) are issued. After resetting, the main body of the copying machine checks it (original document ejection signal) to turn off, and one circulation copy of the original document is completed.

Next, the normal discharge / reverse supply operation will be described. This process is the 21st
The original on the IIa on the platen glass 12 of the copying machine, which is produced by the normal discharge / feed SUB shown in Step 222 of the figure, is the normal discharge S of FIG.
When the document is ejected from the conveyance path VIIa by the UB and the leading edge of the document reaches the sensor S4 (Step 264), the normal ejection operation is temporarily stopped and the anti-feed operation of the next original is started. After entering the transport path Ia and performing separation, the normal discharge operation is restarted again by the rollers 6 and 6a at the transport start time (Step 234), and the discharged document advances from the transport path VIIa to VIa. On the other hand, at the end of the normal feeding operation, the original is on the glass surface IIa, where it temporarily stops, and the process moves to the reverse SUB shown in FIGS. 23 and 24, and waits until the end of the parallel normal discharging operation (Step 243). , The reverse SUB process is restarted as soon as the document is finished, and the originals are fed in the conveyance paths IIIa to IVa to Va to VIa to VIIa to IIa.
Then, the operation is stopped at a predetermined position on the platen glass 12 surface of the copying machine, and a copy operation start command is issued at the paper feed completion SUB in FIG.

The anti-discharging normal supply operation is processed by the anti-discharging normal supply SUB shown in Step 223 of FIG. Platen glass 12 side IIa
The document in FIG. 26 is ejected through the conveyance path IIIa by the anti-ejection SUB in FIG. 26, and advances to the conveyance path IVa at the time when the trailing edge of the original is detected by the sensor S5 (17) (Step 274). The operation is stopped once, and the normal feeding operation of the next original is started.
After entering the conveyance path Ia by B and separating the sheets, the rollers 6, 6a start the anti-ejection operation again at the conveyance start time (Step 234), and the ejected document is ejected through the conveyance paths Va to VIa. On the other hand, when the fed document reaches the conveyance paths Ia to IIa and stops at a predetermined position on the platen glass 12 surface, a copy operation start command is output at the feeding completion SUB in FIG. 27.

Further, the pulling repeat operation is processed by the pulling repeat SUB shown in Step 225 of FIG.
The original in Ia is transported by the reverse SUB shown in Figs.
Proceeding from Ia to IVa to Va to VIa to VIIa to IIa, and again when it stops at a predetermined position on the platen glass 12 surface, a copy operation start command is output at the paper feed completion SUB in FIG.

Next, the anti-discharging / feeding operation will be described with reference to the flow chart of the normal feeding SUB of FIG. 22, the reverse SUB of FIGS. 23 and 24, and the anti-discharging SUB of FIG. To do. A stack of two documents is placed on the document table 1, the anti-discharge / feed mode is specified by the main body of the copying machine, and the (document feed signal) is set. The operation starts. The first original is processed according to the normal feed SUB shown in FIG. 22 as described above, advances along the conveyance paths Ia to IIa, and stops at a predetermined position on the platen glass surface of the copying machine main body.
The reverse permission command is set in ep 239, and the sequence
Move to the inversion SUB shown in Figs.

In FIG. 23, since the table counter [TRNCN] = 0, the process advances to Step 241 to check the reversal permission command set to start the reversing operation, reset the reversal permission command and set the reversal instructing command, and convey the data. Turn on the signal SL for turning on the path switching solenoid to turn on the interval timer [TM4]
Start, set the table counter [TRNCN] ← 1 and proceed to the next step. In Step 242, the drive signal BK of the brake 92 is turned off and the drive signal CL of the clutch 85 is turned on to wait for the end of [TM4], the table counter [TRNCN] ← 2 is set, and the process proceeds to the next Step. In Step 243, it checks whether the paper discharge command has been set and waits for the paper discharge operation to end.However, since the first document is being conveyed, it is being reset and the signal M1CCW is turned on and the belt 8 is reversed. Start driving,
JAM counter [JCN
3) is started, the table counter [TRNCN] ← 3 is set, and the process proceeds to the next step. In Step 244, it is monitored whether or not the sensor S5 detects the leading edge of the document until the JAM counter [JCN3] is finished, and when it is finished, a delay JAM is performed and the process proceeds to JAM RESET SUB. If detected normally, the signal M3CCW is turned on and the rollers 9, 9a
Rotate to start the JAM counter [JCN4] until the document comes out of the sensor S5 and start the table counter [TRNCN]
← 4 and proceed to the next step. In Step 245, it is monitored whether the sensor S5 detects the trailing edge of the document or not until the end of the JAM counter [JCN4]. If normal, the signals M3CCW, M1CCW, CL, SL, CS are all turned off to stop the document transport on the transport path IVa, start the interval timer [TM5], set the table counter [TRNCN] ← 5, and proceed to the next step. . In Step 246, the signal M3CW is turned on while waiting for the end of the interval timer [TM5], the rollers 9 and 9a are rotated, the document is advanced to the conveyance path Va, and the JAM counter [JCN5] up to the sensor S6 (18) is set. Start and set the table counter [TRNCN] ← 6 to the next Ste.
Go to p. In Step 247, whether the sensor S6 detects the leading edge of the document is monitored until the end of the JAM counter [JCN5]. If the document is normal, the document passes from the rollers 10 and 10a through the conveyance path VIa to the rollers 11 and
Proceed in the direction of 11a, start the JAM counter [JCN6] until the document comes out of the sensor S6, and turn the table counter [TRNC
N] ← 7 and proceed to the next step. In Step 248, it is monitored whether the sensor S6 detects the trailing edge of the document until the end of the JAM counter [JCN6].
Go to. If it is normal, turn off the signal M3CW and feed the document.
Stop at VIa, start the interval timer [TM6], set the table counter [TRNCN] ← 8 and proceed to the next step. In Step 249, after waiting for the end of the interval timer [TM6], the signals M3CCW, CL and SL are all turned on to start driving, and the document is advanced to the conveyance path VIIa by the rollers 10 and 10a, and the JAM up to the sensor S4. Start the counter [JCN7] and set the table counter [TRNCN] ← 9 to proceed to the next step. In FIG. 24, in Step 251, it is monitored whether or not the sensor S4 detects the leading edge of the document until the end of the JAM timer [JCN7], and when it is completed, the process proceeds to JAM RESET SUB as a delay JAM. If normal, start JAM counter [JCN8] up to sensor S3 and turn on signal M1CW to turn table counter [TRNCN]
← 10 and proceed to the next step. In Step 252, it is monitored whether or not the sensor S3 detects the leading edge of the document traveling on the conveyance path VIIa until the end of the JAM counter [JCN9], and if completed, the process proceeds to JAM RESET SUB as a delay JAM. If normal, then sensor S3
Start the JAM timer [JCN9] until the document comes out, set the table counter [TRNCN] ← 11 and proceed to the next step. In Step 253, it is monitored whether or not the sensor S3 detects the trailing edge of the document until the JAM counter [JCN9] is finished, and when it is finished, the jammed JAM is proceeded to JAM RESET SUB. If the document is normal, the document passes through the rollers 6 and 6b, travels along the transport path IIa and depends on the driving of the belt 8. At this point, the signal CS is turned on and the clock input to the interrupt terminal INT is transported. Switch from the clock to the belt clock as described above, without changing the correspondence between the clock and the transport distance, start the registration counter [RGCN2] corresponding to the transport distance to the predetermined position on the platen glass surface of the copier body, and Counter [TRNCN] ← 12 and proceed to the next step. Step 254
Now wait for the end of the registration counter [RGCN2],
1CW off, CL off, BK on
Table counter [TRNCN] by resetting the inversion command
Return to ← to end the inversion process.

In this state, the anti-feeding sequence is completed, and the process moves to the paper feed completion SUB shown in Fig. 27. As described above, the (document feed completion signal) is set, and the copy operation of the first document of the copying machine body is started. To start.

Next, the anti-ejecting operation of the first original and the anti-feeding operation of the second original after the copying of the first original will be described. When the copy operation is completed, the copier body sets (original paper feed signal), and since the anti-ejection / refeed mode is specified, the process of Step 224 in FIG. Start with the action. First
In the anti-discharge SUB shown in Fig. 26, the table counter [EJC
Since N] = 0 has been set, the processing of Step 271 is performed. In Step 271, the paper discharge permission command is issued in Step 234 in FIG.
Since it has been set at, the next step is to reset the paper discharge permission command, reset the paper feed permission command, and the reverse rotation permission command.
Prohibit normal feed and reverse operation, set the paper discharge command, and
SL is turned on, the interval timer [TM4] is started so that the document discharge is advanced to the conveyance path IIIa, the table counter [EJCN] ← 1 is set, and the process proceeds to the next Step. In Step 272, wait for the end of the interval timer [TM4] and wait for the signal M1C.
CW is turned on and CL is turned on to start document ejection drive, and transport path IIIa
And proceed to the next step by starting the JAM counter [JCN3] up to the sensor S5 and setting the table counter [EJCN] ← 2. In Step 273, it is monitored whether the sensor S5 detects the leading edge of the document until the end of the JAM counter [JCN3]. Signal if normal
Turn on the M3CCW and rotate the rollers 9 and 9a to feed the document
Go to Va, start the JAM counter [JCN4] until the document comes out of the sensor S5, and then the table counter [EJCN]
← 3 and proceed to the next step. In Step 274, whether or not the sensor S5 detects the trailing edge of the document is monitored until the end of the JAM counter [JCN4]. If normal, signal M3CCW off, M1CCW off, CL off, SL
The document is stopped at the conveyance path IVa by turning it off and CS off. At the same time, the paper feed permission command is set to command the start of the anti-feed operation of the second document, cancel the waiting state of Step 231 in Fig. 22, and set the paper feeding command to set the second document. Start separating. Further, the interval timer [TM5] is started, the table timer [EJCN] ← 4 is set, and the process proceeds to the next step.
In Step 275, waiting for the end of the interval timer [TM5] is followed by a waiting state until the paper feeding command and the paper discharge permission command are set. On the other hand, the paper feeding operation of the second original advances,
Since the paper discharge permission command is set at the time of Step 234 in FIG. 22, in step 275, the next step proceeds to reset the paper discharge permission command,
Turn on the signal M3CW to advance the discharged document from the transport path IVa to Va, start the JAM timer [JCN5] to the sensor S6,
Set the table counter [EJCN] ← 5 and proceed to the next step. St
In ep 276, whether the sensor S6 detects the leading edge of the document JA
Monitor until the end of the M timer [JCN5], and if it ends, delay JAM
And proceed to JAM RESET SUB. If it is normal, the original is
It takes 10 and 10a, goes to the conveyance path VIa, starts the JAM counter [JCN6] until the document comes out of the sensor S6, sets the table counter [EJCN] ← 6, and goes to the next Step.
Whether the sensor S6 detects the trailing edge of the document in Step 277 JA
Monitor until the end of the M counter [JCN6].
Go to JAM RESET SUB as AM. If the document is normal, the document proceeds along the conveyance path VIa, is caught by the rollers 11 and 11a, starts the rotation timer [TMOUT] after discharge, and sets the table counter [EJC
N] ← 7 and proceed to the next step. In Step 278, the signal M3CW is turned off while waiting for the end of rotation [TMOUT] after paper discharge, the paper discharge drive is stopped, the paper discharge command is reset, and the table counter [EJCN] ← is set to Step 271 as described above. It is in a waiting state. On the other hand, in the paper feeding process, the reversing operation is restarted because it is in the state of waiting for the resetting of the discharging instruction in Step 243 of FIG. 23, and the paper feeding completion process is performed from Step 281 of FIG. 27 as described above. Instruct the copying machine body to copy the second original.

Next, the anti-ejection operation of the second original is performed only by ejecting the (original paper ejection signal) from the main body of the copying machine as described above, and is processed by the anti-ejection SUB in FIG. The process advances to steps 278 to 278. Since (original paper ejection signal) is set in step 278, the start command is reset, the (motion signal) is reset, and all the operations are completed.

Next, the jam processing will be described. The operation of JAM RESET SUB is to turn off all the loads, set the JAM middle command, and set the signal from output port O ₁₁ in Step 291 in Fig. 28.
Turn on the JAM and turn on the jam lamp 24. Furthermore, the serial data (JAM signal) is set, then in Step 292, it is checked whether each document detection sensor S1 to S6 and ES has detected the document, and if any, it proceeds to the next Step. First, JAM RESET is not done. The operator removes the original and turns off the original detection signals from all sensors.
Continue to 93. If the operator judges the door opening / closing process and it is performed, the process proceeds to Step 294 to reset the JAM mid command, turn off the signal JAM from the output port O ₁₁ , (JAM signal) reset, all commands. JAM RESET processing is completed by resetting and resetting all counter timers.

Next, the document size detection process will be described. The SIZECK SUB will be described with reference to FIG. The fed document is counted by the [Document Size Counter] while the sensor S2 detects the document by the transport clock and the belt clock, that is, from the leading edge to the trailing edge of the document, and the data corresponding to the size is stored. There is. Therefore [Document size counter]
The data of is compared with the data of the predetermined document sizes A3 to B5 to determine the document size. For example
If it is A4, it can be determined when the relation of B5R data> [original size counter] ≧ A4 data is satisfied, and a process of setting 1 to (original size signal) of serial data sent to the copying machine main body is performed. At the end of the processing, after the size determination, the (original size counter) is cleared and the original size is determined one by one in preparation for detection of the size of the next fed document. Also, at this time, when the original whose size has been detected is set to a reverse JAM counter for each sensor when performing operations such as reversing or ejecting paper, the counter data is added to the measured original size data. By setting the value to α, more accurate retention JAM detection is performed.

Next, the serial transfer method will be described. FIG. 30 is a flow chart for performing serial communication with the main body described above. In Step 301, check whether the request signal REQ, which is a serial communication request signal from the main body, is checked, and serial communication is started with input. To do. In Step 302, the 8bit serial transmission data (FLDO1) (FLDO2) (FLDO3) is stored in the data storage register [SiREG] output to the SO terminal of the microcomputer 120 that transmits data to the main unit according to the contents of the counter [SOCN]. Register to the SO pin [Si
[REG], and turns on the acknowledge signal ACK that informs the main unit that the serial communication is ready. Here, the serial communication between the main body B and the apparatus A is automatically performed by the μCOM43N method, and the check is performed until the serial 8-bit communication is completed in Step 303, and the data 8-bit is exchanged. Step30
In 4, the acknowledge signal ACK is turned off at the end of serial communication, the data is stored in the register [SiREG] from the Si terminal of the microcomputer 120 that has received the data from the main body, and the content is stored in the serial received data 8-bit (FLDi1). Store. Further, the content of the above-mentioned counter [SOCN] is incremented, and if [SOCP] = 3, [SOCN] ← 0 is set again and the content of [SOCN] is sequentially updated for each serial communication.
Serial transmission data stored in the register [SiREG] of 2 is sequentially (FLDO1) → (FLDO2) → (FLDO3) → (FLDO1)
・ ・ ・ ・ ・ ・ Is specified. If the request signal REQ is not input in Step 301, serial communication is not performed, and the process proceeds to Step 305, Step 306, and Step 307, where (FLDO1) (FLDO
2) This is the step to set / reset the (FLDO3) data. At Step 305, the data (original detection signal) in (FLDO2) is set / reset depending on whether or not the entrance original document 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 detecting. Also Step30
In 7, 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 RDF in each operation mode controlled according to the flow chart described above.
The figure shows the case where the first original is fed in the normal direction, the figure 32 shows the case where the first original is fed in the reverse direction, the figure 33 shows the case where the final original is discharged in the forward direction, and the figure 34 shows the final case. If the original is reversed and ejected,
Fig. 35 shows the case of the normal discharge normal feeding operation, Fig. 36 shows the case of the original normal discharging / feeding operation, and Fig. 37 shows the case of the original anti-discharging normal feeding operation.
FIG. 38 shows the case of the anti-discharging / feeding operation of the document, and FIG. 39 shows the case of the repeated pulling operation of the document.

Although a reflective sensor is used in the above embodiment, a transmissive sensor, a micro switch, a lead switch or the like may be used.

Moreover, although the interrupt terminal (1) of the microcomputer is used as the counting means to count by the program, a hard logic circuit using a counter IC can also be used.

Also, the configuration is such that one clock is selected by the switching means and input to the interrupt terminal ▲ ▼, but the switching means is deleted and all the clocks are put in the input port, and the program of the microcomputer is made. It is possible to meet this purpose by switching and counting at.

Further, the clock signal is generated by driving the conveying means, but it may be generated by a pulley or the like that rotates when the document is conveyed.

Effect As described above, according to the present invention, since the original is discharged and the original is reversed from the same side as the original is fed, the original feeding apparatus for handling a single-sided original or a double-sided original has a compact structure and is exposed. Since the feeding of the next original is started during the discharge of the finished original, the originals of the single-sided original and the double-sided original can be quickly exchanged.

Further, since the reversing operation after feeding the next original document to the exposure position is made to stand by for the first time, the reversing operation of the next original document is performed after discharging the exposed original document. In the configuration that also serves as the conveyance path for reversing, it is possible to prevent the reversing document from colliding with the discharged document and causing a document jam.

Therefore, it is possible to provide a document feeding device having a compact structure that can quickly exchange one-sided and two-sided originals.

[Brief description of drawings]

FIG. 1-1 is a cross-sectional view of a copying apparatus including a double-sided document circulating device, a double-sided copying machine, and a sorter, FIG. 1-2 is a diagram showing a paper discharge tray, and FIG. 2 is a drive system of the double-sided document circulating device. Rear sectional view, 3 to 7,8-1,8-2,9-1,9-2,10-1 to 10-3,11,1
2-1, 12-2, 13-1 to 13-3 are views showing the state of the original or copy paper, FIG. 14 is a view showing the control circuit of the copying machine shown in FIG. 1, and FIG. 15 is a line. Figure 16 shows the circuit configuration of the receiver. Figure 16 shows the circuit configuration of the line driver.
FIG. 17 is a diagram for explaining the serial transfer system, FIG. 18 is a double-sided document circulating device, timing chart of each signal of serial data for each operation of the copying machine main body, and FIGS. 19 to 30 are controls of the double-sided document circulating device. Flow charts, FIGS. 31 to 39 are timing charts in each operation mode of the double-sided document circulating apparatus. In the figure, A is a double-sided document circulating device, B is a copying machine main body,
C is a sorter, 1 is a document table, 8 is a belt, 13 to 20 are sensors, 21 is a pulse motor, 22 is a partition arm, 80, 82, 97.
Is a motor, 85 is a clutch, 92 is a brake, 93 and 103 are circular disks, 95 and 105 are photoelectric sensors, 107 is a switching solenoid, and 120 is a microcomputer.

Continuation of the front page (56) Reference JP-A-58-80667 (JP, A) Actually opened 55-121242 (JP, U) Actually opened 55-16600 (JP, U)

Claims (1)

[Claims] 1. A feeding unit for feeding a document to an exposure position; a discharging unit for discharging a document at the exposure position from the same side as the document feeding side along a discharge path; and a document at the exposure position. Is temporarily discharged from the exposure position, the discharge path is also used to reverse the front and back of the document, and the document is fed again to the exposure position; and in the case of the first mode in which one side of the document is exposed, The document is fed to the exposure position by the feeding unit, the document is ejected from the exposure position by the ejecting unit after the exposure is completed, and the next document is fed by the feeding unit while the exposed document is ejected by the ejecting unit. Start feeding and expose both sides of the original
In the mode, the document is fed to the exposure position by the feeding unit, inverted by the reversing unit without being exposed and fed to the exposure position, and after the exposure of the first side of the document is completed, The document is inverted by the reversing unit to be fed to the exposure position, the document is ejected from the exposure position by the ejecting unit after the exposure of the second surface of the document is completed, and the document is ejected during the ejection of the exposed document by the ejecting unit. Control means for starting the feeding of the next document by the feeding means, wherein the control means is configured to feed the next document to the exposure position by the feeding means in the second mode. A document feeding apparatus, wherein the reversing operation of the next document by the reversing means is temporarily made to stand by so that the reversing operation is performed after the exposed document is discharged by the discharging means.