JPS6190932A - Manuscript transferring device - Google Patents

Abstract

PURPOSE:To prevent manuscripts from jamming and damage in a manuscript transferring device of an electrophotographic copier or the like by maintaining constant the overlapping amount of supplied manuscript and discharged one irrespective of the manuscript size when the manuscripts are interchanged and pass each other. CONSTITUTION:When (1)-(4) pages of single surface manuscripts are mounted on a manuscript mount 1, an inlet manuscript sensor ES20 detects the manuscript. When a copying starting button is depressed to execute paper supply process, the manuscript page (3) transferred toward a platen glass 12 advances from the left end side of said glass 12 between a full surface belt 8 rotating forward and the upper surface of exposed manuscript page (4) being reversely transferred on said glass 12 and passes by the exposed manuscript page (4) with a transferring force of said belt 8 while being transferred toward the right side of said glass 12. The feed amount of manuscript is figured out of size data by a discharge paper transfer counter such that an amount l of passing each other of overlapping A4, A3 size manuscripts is equal to L, so that satisfactory interchange of the manuscripts are achieved irrespective of the size of the manuscripts.

Description

TECHNICAL FIELD The present invention relates to a document conveying device that feeds a document to an exposure position and discharges the document after completion of 'R' light.

BACKGROUND OF THE INVENTION A typical example of this type of apparatus is a circulating automatic document feeder installed in an image forming apparatus such as a copying machine.

This separates the originals stacked and set on the original placing table as a sheet holding part, and transports them to the platen glass of the original illumination part of the image forming apparatus such as a copying machine, which is a predetermined sheet processing part. After the exposure is completed, the original is returned to the original platen and transported, and a cycle of feeding the original from the original platen to the platen glass is performed sequentially for each set of originals on the original platen. One copy of all stacked documents can be obtained by circulating the stacked documents once, and the required number of copies can be obtained by repeatedly feeding the stacked documents a predetermined number of times.

Therefore, it is extremely effective in automatically and quickly copying a large number of sheet originals.

Conventionally, such a device has been proposed to have an MtJ structure in which documents are fed and discharged from the same side of the platen glass at the same time. Therefore, it is very difficult to pass the document quickly, and furthermore, high precision is required to prevent jamming and damage to the document.

OBJECTS It is an object of the present invention to provide a document conveying device which solves the problems of the conventional devices described above and which does not cause jamming or damage to documents.

Example The present invention will be described in detail below with reference to the drawings.

Figure 1 C&) is an external perspective view of a document conveying device according to an embodiment of the present invention installed in a copying machine, Figure 1 Cb') is a sectional view thereof, and Figure 2 is an enlarged view of this document conveying device. cross section,
FIG. 3(a) is a perspective view of the movable deflection plate, and FIG. 3(b) is a side view thereof.

This document conveying device can support one-sided original--single-sided copy mode, one-sided original--double-sided copy mode, double-sided original--single-sided copy mode, or double-sided original--double-sided copy mode.

That is, by loading this RADF into an ordinary copying machine, it is possible to automatically obtain single-sided copies not only from single-sided originals but also from double-sided originals.

In addition, by loading this RADF into a double-sided copying machine, it can automatically make double-sided copies from single-sided originals.

You can also obtain single-sided copies of each if needed.

In this example, it is assumed that the downward surface of the document fed onto the platen glass is subjected to the Illumination II exposure process.

Also, a single-sided original means that the first side of the sheet is the image side.

A double-sided document is one in which there is no image on the second side.
Both sides are image sides 1 Single-sided copying is an image forming process in which an image is formed on the first side of the copying material sheet and no image is formed on the second side, and double-sided copying is the process of forming an image on the first side of the copying material sheet. An outline of each mode, which refers to an image forming process of forming images on the first and second sides of a sheet, will be described below.

A0 single-sided original - single-sided copy mode - When a single-sided original is set on the document table with its first image surface facing upward, the original is fed in reverse. This allows the first side, which is the image side of the single-sided original, to face downward on the platen glass. supplied to the image forming device (
(hereinafter simply referred to as the machine side) performs one-sided copying of that image surface. The document is discharged in reverse. As a result, the original is returned to the original/loading table with the first side facing upward, the same as when it was first set.

When a one-sided original is set with the image side A81 facing down on the original placing table, contrary to the above, the original is fed by normal forward feeding, and the same is ejected by normal forward ejection.

B1 single-sided original - double-sided copy mode The feeding and ejection of the original is the same as in section A above. After being treated.

Next, the copying process of the image of the supplied single-sided original is performed on the copying material sheet. A double-sided copy is obtained by doing this on a surface.

C0 double-sided original--single-sided copy mode When double-sided originals are set on the original table in page order, the original feeder is reversely fed an even number of times. As a result, the final page side of the double-sided original is fed face down onto the platen glass, and the copying process for that image side is performed on the first side of the material sheet on the machine side, and the copying process for that image side is performed on the first side of the material sheet. A single-sided copy for the first side is obtained.

7. Next, the document on the platen glass with the first side facing downward is inverted and fed again. As a result, the original (last page - 1) is re-fed onto the platen glass with the page facing down.
A copying process for that side is performed on the WS1 side of the next copying material sheet on the machine side, and a single-sided copy of the second side of the double-sided original is obtained. The document is discharged in reverse. As a result, the original is returned to the original placing table in the same page order as when it was first set.

D1 Double-sided original - double-sided copy mode The feeding and ejection of the original is the same as in item 0 above, and the copying process for the first and second sides of the double-sided original is performed by copying the first and second sides of the same copy material sheet on the machine side. A double-sided copy of a double-sided original can be obtained by sequentially performing the steps on the first side and the second side.

By providing the document feeding system of the present invention in this manner, it is possible to automatically perform image forming processing in various modes A to D, which is extremely convenient.

The document conveying device A will be specifically explained below based on one drawing.

First, a double-sided electrophotographic copy Ia 100 into which the document conveying device 1A of this embodiment can be loaded will be explained.

12 is butylene glass, 330 is a photosensitive drum driven to rotate in the direction of the arrow around the shaft 330a, 331 is a charger,
332 is a developing device, 333 is a transfer charger, and 334 is a cleaner. 335 is a cassette for storing copying materials such as copy paper, and 336 is a cassette for storing copy paper in the cassette.
Feeding rollers 337 and 337a are register rollers that send out the copy material one by one, and 338 is a fuser 339 for transferring the copy material after transfer.
This is a conveyor belt that conveys up to 39a. 340 is an intermediate tray that stores copy materials after single-sided copying; 341 and 34;
1 m is the drive shaft and driven shaft of the feed belt 342, 343.
Reference numeral 343a denotes a drive shaft and a driven wheel of the separation belt 344, which serves as a mechanism for re-feeding copy materials stored in the intermediate tray 340 from below. Also, 3450345
After copying is completed, copy material a is sent to the tray T by a discharge roller, or if a sorter (not shown) is connected, the copy material is discharged to each bin of the sorter.

The moving route of the copy material is as follows.

First, the case of one-sided copying will be explained. cassette 335
The copy material sent out from the register roller 337-3
37a reaches the transfer section F in synchronization with the visible image formed on the photosensitive drum 330, where the visible image on the drum 330 is transferred.Next, the copy material onto which the visible image has been transferred is transferred to the conveyor belt 338. After being conveyed on path (b) and reaching the fixing devices 339 and 339a and fixing the visible image,
It passes through path (b) and is discharged onto tray T by discharge rollers 345 and 345a.

Next, the case of double-sided copying will be explained.

In the case of double-sided copying, the guide 48 is switched to the chain line position, and the copy material after one-sided transfer is guided to the path mb after passing through the fixing device 339 and 339a. And this copy material is pass m
Then, the copy materials on the tray 340 are separated one by one by the rotation of the belts 342 and 344, and are transferred from the tray 340 to the pass. ■It is sent to b.

The copy material sent to the path vtb is also sent to the transfer section F by register rollers 337 and 337a in synchronization with the image on the drum 330, and the developed image is transferred to the second surface thereof. Thereafter, it passes through (b), and after fixing the image on the second side, copying is completed on both sides of the copying material, and the copying material is discharged onto the tray T.

Next, the document transport device HA will be explained.

In Fig. 1 (&), (b) and Fig. 2.

Reference numeral 1 denotes a stacking tray (mounting table a) on which originals are stacked and set. This tray 1 supports the originals, and is arranged so as to be tilted downward toward the original feeding direction so that the original feeding side is lower. As a result, the fed documents are stacked in a uniform manner in the sending direction. 2b is a half-moon roller.

The document is rotated in the direction of arrow E to send the document to the downstream separation section, and if there is no document on tray 1, it is controlled so that the notch portion faces upward and stops. 2・2
A is a feeding roller that rotates the feeding belt 3 in the direction of arrow C to feed the document on the tray l. Furthermore, 4Φ4a is a separation b-ra, which separates the lowest originals among the originals stacked on the tray 1 between it and the feeding belt 3 one by one by rotating the separation belt 5 in the direction of the arrow. . The feed belt 3 and separation belt 5 constitute a separation supply section.

The first sheet path In, na is a path for moving originals separated sheet by sheet by the one-separation supply section onto the platen glass 12. The sheet path Ia is provided in a 7-inch shape between the separation supply section and the end of the platen glass 12, and is used to invert the original sent out by the feeding belt 3 and guide it onto the platen glass 12. .

The second sheet path ma, ffa is the platen glass 12.
This is a path for inverting the upper document and guiding it to the stacking tray l. Here, the second sheet paths ma and ffa are provided opposite to the first sheet paths Ia and Ila, and extend from the end of the platen glass 12 to the upper side of the separation belt 5 through the outside of the sheet path Ia.

The third seat path Va, Via is the second seat path ma
, a path branching from IVa in the switchback direction,
This is a path for reversing double-sided originals.

The second half of this pass Va is a pass a, which is formed by an arch-shaped guide, and the document that has been traveling approximately horizontally in the pass Va is reversed upward along the arcuate part of the guide and sent out of the machine from the pass opening. It is designed to mist the parts. That is,
The document surface that will be sent to the platen glass 12 is exposed outside the machine with the surface facing upward, so that the document surface can be checked.

The fourth seat path Wa is the seat path Va, v of IJ3.
A path that branches further from Ta in the switchback direction,
This is for reversing double-sided originals. 83 (7) Sheet path Va, ■ This is a passage for switching back the original from a and guiding it to the platen glass.

Further, the roller S fist Sa/6b is a sheet feeding roller, and the sheet path Ia is formed between the rollers 6 and 6a.

The original passing through na is conveyed toward the platen glass 12, and is passed through a sheet path rna between rollers 6 and 6b.

The document passing through the ffa is sent to the feed tray 1 direction. Also 9
m9a*lO*10a*ll*11a are feed roller pairs, and roller pairs 10-10m and roller pairs 11 and 11a feed the original from the platen glass 12, and rotate the toy in one direction and then reverse it. The originals from the second sheet passes ma and ffa are switched back and transferred to the third sheet passes Va,
It is for sending to Ia. Also, Roller vs. 9 fist 9a is
The original that has progressed through the third sheet path Va, Ia is reversed and conveyed in a path direction that exposes a part of it outside the machine, and after it is stopped once, it is reversed and transferred from the third sheet path Va, ltlm to the fourth sheet path.
Feed in the direction of the sheet path Wa. Further, reference numeral 24 denotes a flexible deflection plate, which is attached to the guide so that its tip touches the document conveying belt 82 or leaves a slight gap therebetween.

And the first seat pass! &.

The leading edge of the original that has passed through the deflection plate 24 is pushed away and passes through the platen 12 and proceeds in the direction of the platen 12.The leading edge of the original that has passed through the deflection plate 24 is in contact with or close to the belt 8. The seat is guided to the second seat path l1fa with a certain distance. At this time, the movable deflection plate 23
Direct the document to the second sheet path mh in the state of one line.

Furthermore, 25 is a similar flexible deflection plate.

Its tip is pasted onto the guide.

The leading edge of the document passing through the sheet path ma can be pushed aside and passed through. Further, the document heading from the second sheet path ma to the first sheet path Va is reliably guided to the path Va because the tip of this deflection plate 25 is pressed by the guide (hereinafter referred to as the third sheet path Va). Figure (a)・(
b)), the movable deflection plate 23 is used in the fifth sheet path Ia and the second sheet path ma.

It is arranged at the left end side merging part of the platen glass 12 of the fourth sheet path Va. And it is arranged parallel to the drive rotor of the belt 8.

It is free to swing and rotate about shafts 25 at both ends.

Further, this deflection plate 23 is always urged in the upward rotational direction by a spring 26, and its end portion is brought into contact with the stopper portion of the guide, so that the receiver is stopped. Furthermore, when the plunger 27 is energized, the movable deflection plate 23 rotates downward as shown by the chain line. When the chain line position is set, the document that is retracted from the platen 12 after reaching the platen 12 from the first sheet path ra, Ila is reliably directed to the second sheet path, and when the solid line position is set, the document is to ensure that the sheet is directed toward the platen 12 from the fourth sheet path (a). Note that these deflection plates 24 and 25 are constructed of flexible sheets such as Yailer thin plate stainless steel. Further, 7*7a is a document conveyance roller.

A document conveying belt 7, which can be rotated in the forward and reverse directions and is provided over almost the entire width of the platen 12, is rotated in the forward direction to guide the document onto the platen 12.

Alternatively, the original on the platen 12 is conveyed in order to be removed from the original by rotating in the reverse direction. Note that the document transport roller 7
- 7a uses roller 7 as a driving roller, and roller 7a is a driven roller.

Next, each sensor will be explained.

Reference numeral 20 detects the presence or absence of a sheet on each document stacking table 1 with a transmission type sheet sensor (hereinafter referred to as ES) disposed on the leading end side of the document stacking table 1 . In addition, 13 is a sheet separation supply section and a feed roller 6.
6a and the left end of the transmission type glass 12 disposed in the middle of the first sheet path ja.
A second sheet sensor (hereinafter referred to as sheet feed registration sensor S2) is disposed in the middle of Ia.

Further, 15 indicates the left end of the platen glass 12 and the feed roller 6.
- 16 is a third sheet sensor (hereinafter referred to as sheet discharge sensor S3) disposed midway through the second sheet path ma between the sensor 6a and the third sheet path Va. Furthermore, 17 is a fourth sheet sensor (hereinafter referred to as reversal sensor S4) arranged in the middle of the fourth sheet path (a) between the feed rollers 9, 9a and the left end of the planar glass 12. These first N fifth sheet sensors, Sl-S5, which are the fifth sheet sensors (hereinafter referred to as inversion registration sensors S5), detect the leading edge or trailing edge of the sheet passing through that position.

Further, 19 is a reflective sensor (recycle sensor) R5 for detecting one circulation of the document bundle.

The partition arm 22 is stopped rotating toward the east by the recycling motor 21, and at that point, the recycling sensor R3,
19 is turned off, and then the originals are fed separately from the bottom original, and when the rear end of the final original passes over the partition arm 22, the partition arm 22 pulls out the position of the recycling sensors R5 and 19 due to its own weight, and is turned on. There is.

In FIG. 2, the separation drive motor (not shown) includes feeding rollers 2, 2a and a half-moon roller sb.

The separation rollers 4 and 4a are each driven to rotate, and the feed belt 3 is driven in the direction of arrow C, the separation belt 5 is driven in the direction of arrow C, the half-moon row is driven in the direction of arrow E, and the belt 2b is driven in the direction of arrow E.

The feeding roller and drive motor (Fig. 4, 54).

Sheet feed rollers 6゜6a, 6 with a motor capable of forward and reverse rotation.
b.
CW), it rotates in the direction of the chain arrow. Further, the main shaft of the conveyance roller drive motor is provided with a clock disk (not shown) and a conveyance lock interrupter sensor (FIG. 4, 51) for detecting its rotation.

Furthermore, the full-surface belt drive motor (Fig. 4, 55) is a motor capable of forward and reverse rotation, and rotates the drive roller 7 of the full-surface belt 8, and rotates in the direction of arrow a during forward rotation (CW) and in the direction of arrow a during reverse rotation (CCW). Rotate in the direction. In addition, an electromagnetic brake (Fig. 4, 56) is attached to the entire belt and the main shaft of the drive motor to accurately stop the rotation, and a clock disk (not shown) and a belt clock interrupter are installed to detect the rotation. A sensor (Fig. 4, 51) is provided.

FIG. 4 is a block diagram showing a control circuit for performing sequence operations in an embodiment to which the present invention is applied.
It is mainly composed of a well-known one-chip microcomputer (hereinafter referred to as a microcomputer), and is controlled by exchanging signals with the controller of the copying machine main body 100.

Input ports ■1 to F of the microcomputer are provided with a document sensor ES2 provided in the downstream direction of the tray l, which receives a signal from the sheet sensor 51-35 provided on the document transport path described above.
Signal from 0.

and a signal from a partition 7-m sensor (recycle sensor) R319 that detects the drooping of the partition arm 22, respectively. In addition, the interrupt terminals lNT1 to INT of the microcomputer
2 receives a signal from the transport lock interrupter 51 that detects the rotation of the motor and a signal from the belt clock interrupter 52 by the clock disc attached to the transport drive motor shaft mentioned above. As described later, it becomes the reference clock for the amount of paper feed movement.
On the other hand, a counter inside the microcontroller performs each counting operation.

Output ports (01 to 08) of the microcomputer include the aforementioned separation drive motors 53. A partition arm drive motor 21 that drives the partition plate 22, the aforementioned movable deflection plate solenoid 27. Operation signal of the electromagnetic brake 56, further sent to the roller drive motor 5
The cw and ccw signals that cause the motor 55 to operate in the forward and reverse directions, and the cw and ccw signals that cause the full-surface belt drive motor 55 to operate in the forward and reverse directions are output, respectively, and turn each output load on and off via the driver DIND9. In addition, signals are sent and received between the copying machine body B and this device A via the cable 101, and the microcomputer input port! A document feed signal, a document discharge signal, and a mode signal are inputted to drivers D9.8 to r10, respectively, and drivers D9. Dtot intervention cop
A y request signal and a cycle end signal are output. Each signal will be described later.

Reading of these input signals or turning on/off the load is controlled by a program stored in the ROM in the buoy.

Next, the operation will be explained based on the flowcharts of the program for carrying out this embodiment shown in FIGS. 5 to 10 and the operation diagrams shown in FIGS. 11 to 13.

A. If the original is a single-sided original (copying 2 copies from a 4-page original) Specifically, as shown in the example shown in Figure 13, 4 sheets 1 of pages ■ to ■
Two single-sided or double-sided copies shall be obtained from a set of single-sided originals. When a one-sided original of pages 1 to 2 is placed on the original placing table l, the entrance original sensor ES2G detects the original.

By an operation panel (not shown) on the copying machine main body 100 side.

After setting the copying conditions such as that the set original is a one-sided original and specifying the required number of copies (2 copies/one-sided copy mode or double-sided copy mode), press the copy start button. At this time, specify the one-sided mode. Output.

By pressing the copy start button, the single-sided mode processing program shown in FIG. 5 is started.

■ First, the loading platform! The partition rear arm drive motor 21 is moved 200 m5. drive At that time, the partition arm sensor R319 is in the off state si, and the copying machine main body 10
The cycle end signal, which is a signal that informs 0 of one cycle of the original document, is sent immediately. (step) Next, the program proceeds to 5 step 2, where separation processing is performed, and the lowest original page of the document stack is separated. The separation drive motor 53 is turned on so as to separate only one sheet, and the rate pass Ia
Go inside! After detecting the leading edge of the A paper sensor SIM document, the 1-minute loop tire is started, and after completion, the separation drive motor is activated!
53, the document stops with its leading edge touching the nip portion of the feed rollers 6 and 6a, and a loop of a predetermined amount being formed. This has the effect of correcting the skew even if it occurs during one separation. (No. 7-
(See Figure 1) () Next, proceed to 5step 3 where paper feeding processing is performed, drive the feed roller 6.6a, and move the document to the sheet path Ia.
The feed roller drive motor 54 is used to convey the material from
is turned on in normal rotation, and the full belt drive motor is turned on in normal rotation so that the document is conveyed onto the platen glass 12 at the same time that the leading edge is detected by the paper feed registration sensor S2 in sheet path II a. The document size counter starts counting based on the clock and begins measuring the document size.

Then, as soon as the document is conveyed and the trailing edge passes through the paper feed sensor 31, the document size counter is stopped, and based on the data, the document size is determined at 5IZECK SUB shown in FIG. (See Figure 7-2) At wS7-2 Figure (7) SIZECK SUB.

In order to determine the size, it is sufficient to make a correction for the deviation in the attachment of the paper feed registration sensor S2 and the paper feed sensor St. At this time, the document is being conveyed only by the feed roller 6.6a. , the feed amount and the count value by the conveyance quick interrupter definitely match. B5. A4゜A4R,B
It determines the size of 5R, B4A3, etc., and serves as a reference for determining the value of the discharged sheet conveyance counter, which will be described later.

Note that the distance between the paper feed sensor St and the paper feed registration sensor S2 is smaller than the size of the smallest document that can be used.

■ Next, the process proceeds to 5tep4 where registration processing is performed, and the document at a position straddling the sheet path ITa and platen glass 12 is transported, and at the same time as the paper feed registration sensor S2 detects the trailing edge, the feed roller drive motor 54 is turned off, and the document The resist counter CLI is started to stop at the exposure position on the platen glass 12.
At the same time as the LI ends, the entire surface belt drive motor 55 is turned off, and the electromagnetic brake 56 is turned on for 100 m5 to reach the exposure position x on the platen glass shown in FIG. 2. Here, while the registration counter CLI is counting, the full-surface belt drive motor 55 is braked to reduce the speed, and the electromagnetic brake 56 is controlled to stop the motor instantly. This ensures an accurate stopping position without variation. Ru. (Refer to Figure 7-3) (A) Next, proceed to step 5, and output a copy request signal to the copying machine main body, so that the copying machine turns off the document feed signal -H, and the optical system operates to close the platen glass 12. The exposure copying process is executed for the original page ■ set with the image side facing down.In this case, if the preset copy mode is single-sided copy mode, the original page Φ
The image is formed on the f51 side of the copy material, and the copy material is discharged onto the copy tray T (FIG. 1(b)) with the image surface facing upward. Further, in the case of double-sided copying mode, the paper is not discharged to the copy tray T but is temporarily fed to the re-conveying mechanism 40 within the copying machine.

・City Next, in 5 step 6, as described later, it is checked whether the discharged original is being conveyed, and in this case.

Since this is the first document, it is determined that the document is not being ejected, and the process directly proceeds to step 5.

■ While the copying machine main unit 100 is in the exposure process, the sequence advances to step 5, and it is determined whether the feeding of the first copy of the original has been completed based on whether the partition arm 22 mentioned above is hanging down and the partition arm sensor 19 is turned on. do. Here, the document is still page ■, so the partition arm sensor 19 is off (step 8), and then it is determined whether the document size of this page Φ is larger than 84 by the document size determination described above (step 9). change the flow of the program.

(Φ If the size of one page is smaller than B4, perform the above-mentioned separation process (step 2) before completing the exposure process for the document of page ■, hit the primary document ■ against the feed roller 6.6a, and complete the loop. The process proceeds to 0 and 5teplo, where the document feed signal is turned on when the exposure process for the first document page of the copying machine is completed, and the C0PY request signal is thereby turned off. goes into action.

Here, we perform a document exchange operation that simultaneously discharges the document page ■ and feeds the next document page ■. First, we proceed to 5tepH, which performs pre-discharge processing for the page ■.
With the movable deflection plate 23 in the position indicated by the chain line in FIG. 2, the movable deflection plate solenoid 27 is turned on so as to form a passage from the platen glass in the direction of the sheet path ma, and then the full-surface belt drive motor 55 is turned on in reverse. The document page ■ is sent to the sheet bus ■a, and after the paper discharge sensor S3 detects the leading edge of the document, the paper discharge loop timer is started, and after completion, the entire surface belt drive motor 55 is turned off, and the document is transferred to the feed roller 6.6b. The tip is brought into contact with the nip portion of the tube, and the loop is stopped once a predetermined amount of loop is formed. This has the effect of correcting the skew even if it occurs during paper ejection. (No. 9-
(See Figure 2) 1 = Sword Next, the program advances to (2) in Figure 5, and by executing the above-mentioned paper feeding process (step 3), the next document page ■ is placed on the feed roller pair 6, 6a side, and 6. The manuscript page ■ is held in the 6b side.Then, the page ■
passes through the sheet path Ia → ITa → on the platen glass, and page ■ passes on the platen glass → sheet path m
It is transported along the route a→ffa.

At this time, the original page ■, which is transported toward the platen glass 12 by the normal rotation of the pair of feed rollers 6 and 6a, starts from the left end side of the platen glass 12 and passes backwards over the entire surface belt 8 and the platen glass 12, which are rotating in the normal direction. It enters between the upper surfaces of the exposed original page (■) being transported, and is conveyed toward the right side of the platen glass 12 while rubbing against each other with the exposed original page (2) by the forward rotational conveyance force of the full-surface belt 8. On the other hand, a conveying force toward the right side of the platen glass acts on the exposed original page ■ which has not yet been cut out on the platen glass 12, but the feed rollers 6, 6 are driven in the normal rotation to outweigh the conveying force.
The document conveying force caused by b is overcome, and the document page (2) is pulled out from between the next document page (2) and the platen glass 12. The paper flow in this operation is shown in FIG.

■=■ Next, the program will register processing (step 4)
Then, by executing the copyy request signal ON (step 5), the original page (2) is stopped at the exposure position on the platen glass as described above, and the copying machine main body starts the copying operation. On the other hand, the document page (■) which is being ejected is subjected to post-ejection processing in step 5, and the ejection count is started at the same time as the ejection sensor S3 detects the trailing edge.
Va- The document reaches the top of the stack, is placed on the partition arm 22, and the feeding roller drive motor 54 and movable deflection plate solenoid 27 are turned off to complete the document discharge (see FIG. 9-4).

- Φ In the main body of the copying machine, the exposure/copying process is executed for the ■th page ■ set on the platen glass 12 with the image surface facing downward. In this case, if the preset copy mode is single-sided copy mode, the #I image of the original page ■ is formed on the :51 side of the copy material,
The copy material is ejected with the image side facing upward on top of the copy material of the ■ page that has been ejected to the copy tray T first.

In addition, in the case of double-sided copying mode, the copying material on which the image of the page 2 has already been formed on the first side is sent out from the intermediate tray 340, and the image of the page 2 is formed on the second side of this copying material, and the image of the page 2 is already formed on the second side of the copying material. A copy is formed, and the double-sided copy is discharged onto the copy tray T with the part 9 side facing upward. Note that the moving route of the copy material is as described above.

[Phase] After that, by repeating the operation of item 000 above.

Reverse feeding of exposed original on platen glass 12, @ placing table l
The cycle of returning the document to the A, separating and conveying the lower document of the stacked documents on the A-mounting table 1, feeding and setting the document to the platen glass 12, and exposing the document is executed one after another.

Here, we will explain the operation when the original pages ■ and (■ are A4 size, and the pages / blanks and ■ are A3 size) are mixed.

Execute item (Note) (a) above, page (■) of the original stops at the exposure position on the platen glass, and when the copying machine body completes the exposure copying process of page (■), the original size changes to B4 in step 9 described above. In this case, since the original size is A3, a program different from the above-mentioned α term is executed.

σ]2[D In this case, unlike the A4 size mentioned above,
The next document separation process (Step 2) is not performed, and 5 steps are performed.
After waiting for the end of the exposure by LO, a 5 tepH sheet discharge pre-processing and a 5 step 12 sheet discharge raw process are executed. During paper ejection pre-processing, the original page ■ which has hit the feed rows 56, 6b and is stopped forming a loop is processed during paper ejection raw processing.
By turning on the feeding roller drive motor 54 in the forward direction, starting the paper ejection conveyance counter, and turning off the motor again at the end, the original is placed on the platen glass and on the sheet path Ha, IVa.
The paper is ejected and conveyed to a position where it straddles the area, and then it comes to a stopped state (see Figure 9-3).

σ]] = D Next, return to ■ in Fig. 5, perform the separation process of 5Lep2, separate the manuscript page ■, and perform the separation process of 5steps 3 and 4.
Then, as in the case of σ=1 described above, the exposed original page ■ and the next original page ■ are rubbed against each other on the platen glass while the originals are exchanged. The flow of paper in this operation is shown in Figure 11. In Figure 11 (■), which shows the flow of A4 and A3 size paper, when the originals overlap and rub against each other, the originals are ejected so that the number of pages that pass each other is L. By calculating the feed amount by the paper conveyance counter from the size data described above, it is possible to exchange original documents efficiently regardless of the size. Also,
In this example, A4→A4. The explanation is about A3 → A3 document exchange, but A3. A in cases where AA manuscripts are mixed together
It is also possible to easily exchange documents from 3 to A4. (1st
(See Figure 2) When reaching the exposure position for document page ■, the aforementioned partition arm 22 hangs downward due to its own weight due to the stack of documents on table a 1, and partition arm sensor R5 is turned on. , the program performs a different process than described above.

In this case, in step 13, a cycle end signal is output to the copying machine to notify that one cycle of the original has been completed, and the copying machine also knows from the cycle end signal that it is the final original, and unlike the above, it is exposed. At the end, the paper ejection operation is started by issuing a document ejection signal so that only exposed originals are ejected (step 14).
.

・The final document page ■ is transferred from the platen glass to the sheet path Ha→ffa→・seconds by the above-mentioned 5tepH (paper ejection preprocessing) and 5step7 (sheet ejection postprocessing).
Since the copying machine is set to copy section R with two copies, the copy materials delivered to tray T must be stacked one copy at a time in two layers as shown in Fig. 13.The copy materials are collected in one cycle of the bundle of originals. Since one copy can be made, if two copies are to be made, the manuscript must also be circulated.

The process then proceeds to 5tep15, where a document return process is executed to restart document circulation by receiving a document feed signal from the copying material. First, the document enters the entrance document sensor "E"
It is checked whether or not S is turned on, and if it is, it is determined that the original is normally stacked on the storage table L, and the process returns to the single-sided mode in order to circulate the next original.

However, as described above, since the originals are ejected from the sheet bus (a) and stacked on the #& placement table (l) due to their own weight, it is conceivable that the originals may not return to the paper feed port for some reason. In this case, since the entrance document sensor ES is off, the one-separation drive motor 53 is turned on for a certain period of time to rotate the half-moon roller 2b located downstream of the loading table l.
The document that is stuck halfway on the stacking table 1 is returned to the paper feed slot. However, if the entrance document sensor ES does not turn on even after driving the motor for a certain period of time as described above, the document is completely stuck on the stacking table 1. It determines that there is a jam, stops driving all loads, and outputs a JAM signal. (Refer to Figure 8-1) 1) In this way, the repeated circular conveyance of the v1@set original on the stacking table 1 is automatically carried out twice in a row for the set number of copies, and the original is placed on the copy tray T of the copying machine. Two single-sided or double-sided copies with the same page order as the original set on the table 1 are obtained.

B. If the original is a double-sided original (copying 2 copies from a 2-sheet original), specifically, as shown in the example in Figure 14, for a set of 2 double-sided originals with pages ■ to Φ, two copies of one-sided or double-sided copies are made. shall obtain something.

Lay the two originals on top of each other in page order, and place them on top of the first one in the same manner as described above, with the nine sides facing upward.

After setting the copying conditions such as that the set document is a double-sided document and specifying the required number of copies (21), single-sided copy mode or double-sided copy mode, using the operation panel (not shown) on the side of the copier Mizufi100, press the copy start button. At this time, the duplex mode designation is output, and the duplex mode processing program shown in FIG. 6 starts.

■ First, separate the lowest pages (3) and 4) from the stack of originals placed on the storage table L and feed them to the platen glass.
The conveying process here is different from the registration process (step 4) in single-sided mode, and at that point, the document that is in the position straddling the sheet path II a and the platen glass is conveyed and fed. At the same time as the paper registration sensor S2 detects the trailing edge, the feeding roller drive motor 54 is turned off, and a conveyance counter is started to stop the document near the left side on the platen glass. When the counter finishes counting, the entire belt is turned off when the paper is rotated. The drive motor 55 is turned off.

In this transport process, unlike the above-mentioned resist process, the stop position on the platen glass does not need to be the exposure position (marked by often.

The conveyance distance may be short, and in this case, braking control is performed from the rear edge detection of the paper feed registration sensor S2 as in registration processing, the speed is reduced, and the electromagnetic brake 56 is turned on.
Since it is not necessary to take an accurate registration position, these controls are not executed, which has the effect of simplifying the control and increasing the document conveyance speed. (Refer to Figure 9-1) C) Once the original is stopped on the platen glass, the following 5
In the 0 reversal process, which proceeds to step 17 and performs the 1 reversal process, the above-mentioned 5 tepH paper ejection preprocessing is first performed, and the feed roller pair 6
, 6b, the above-mentioned diagonal feeding of the sheet is performed.

Next, the feeding roller drive motor 54 is turned on, and the original is transferred from the feeding rollers 6, 6b (forward rotation) to the second sheet path II [a-e
Feed roller 10, 1 oa (normal rotation) → Sheet path [Va →
Take the feed licorice roller 11φ11a path.

Next, after the passage of the trailing edge of the original is detected by the paper ejection sensor S3, the entire surface belt drive motor 55 is turned off, and a predetermined reversal 1 is performed.
When the counter elapses, the feed roller pair 10, 10a1
111. lla is reversed. By the time the reversal 1 counter counts up, the trailing edge of the document has entered the second sheet path rVa and has arrived in front of the roller pair 10Φ10a.

Next, the original in the second sheet path rVa is conveyed in a switch pack by the reverse rotation of the rollers lO and lOa, 11 and 11a, and enters the third sheet path Va, and then the feed roller pair 9 and 9a are in the normal rotation state. Enter the third seat pass ■a.

Next, when a predetermined reversal 2 counter has elapsed since the passage of the trailing edge of the document was detected by the reversal sensor S4, the pair of feed rollers 9 and 9a are reversed. By the time this reversal 2 counter counts up, the trailing edge of the original is on the third sheet pass lH.
It enters the a side and reaches just before the roller 9-9a.

Next, the document 03 is conveyed in a switchback manner by the above-mentioned reversal of the roller pair 9Φ9a, and enters into the fourth sheet bus ■a. At this time, the movable deflection plate 23 is switched to the solid line position and passes through the upper surface of the movable deflection plate 23 toward the left side of the platen glass 12.

Next, when the passage of the leading edge of the document that has entered the fourth sheet bus (a) is detected by the reversal registration sensor S5, the forward rotation of the full-surface belt 8 is started, and the document is moved from the top surface of the movable deflection plate 23 to the movable deflection plate. It passes through the gap between the leading edge of the platen glass 12 and the full-surface belt 8, and enters between the platen glass 12 and the full-face belt 8 which is rotating normally, and is transported toward the left side of the platen glass 12 by the transporting force of the belt 8.

Next, when a predetermined registration count of 2 has elapsed after the passage of the trailing edge of the document is detected by the reversal registration sensor S5, the forward rotation of the full-surface belt 7 is stopped, and at the same time, the electromagnetic brake is turned on for Looms. Furthermore, while the registration counter is measuring time, the above-mentioned full-surface belt drive motor 55 is braked to reduce the speed and increase the accuracy of the stop position. At this point in time, the trailing edge of the document conveyed onto the platen glass 12 has reached a predetermined baseline position X (
(See Figure 9-2).

As a result of the above-mentioned document conveyance, the document is conveyed and set on the platen glass 12 with the page surface facing downward.

(humiliation) Next, turn off the C0PY request signal (step 5)
As a result, the optical system 346, skewer 347a, etc. of the copying machine are operated, and an exposure e-copying process is executed for the downward facing page surface of the original on the platen glass 12. In this case, if the preset copy mode is the single-sided copy mode, (1) the image on the page side is formed on the first side of the copy material, and the copy material is discharged to the copy tray T with the image side facing upward. In the case of double-sided copying mode, the paper is not discharged to the copy tray T, but is temporarily fed to the intermediate tray 340, which is a re-transport mechanism within the copying machine.

b4) Next, wait for the copying machine to finish the exposure (step
lo) Perform the above-mentioned inversion process (step 17) again, invert the document page ■/■ so that the page surface of the original page faces downward, stop it at the exposure position, and
Turn on the py request signal and output to the copying machine. (ste
p5) ■ The exposure/copying process is executed on the copying machine 100 side for the I/page surface. In this case, if the copy mode is single-sided copy mode, the page surface is formed on the first side of the copy material, and the copy material of the page is ejected onto the copy tray T first with the image side facing upward. is discharged on top. In addition, in the case of double-sided copying mode, the copying material on which the (small page image) has already been formed on the first side is sent out from the intermediate tray 340, and the second side of the copying material is formed with the corresponding ■E9 image, forming a double-sided copy. (2) The paper is ejected onto the copy tray T with the page side facing upward.

(Den) While the copying machine is exposed, it is possible to check whether the original cycle has been completed or not depending on whether the partition arm sensor R3 is on at steps 8 and 9, as in the single-sided mode processing described above, and whether the original is currently on the platen glass. It is determined whether the size of is 84 or more, and the subsequent program processing is divided into three ways.

σ=] If the original page l■/■ is A4, the above A-
Similar to Section 8, separate the next manuscript page ■/■ (step
2) and hold it in the feed rollers 6, 6a,
Wait for the exposure to end (step), and then print the page (Φ/,■
is gripped by the feed roller 6.6b in the paper discharge preprocessing (step PH), and the paper is fed in the paper feeding process (step 3).

Conveyance processing (5 steps 16) and post-discharge processing (step 7)
) on the page (■／・Cow is sheet path IUa → IVa → The path of the original table is again page ■ / inside is sheet path Ia+
The document is fed and ejected along the path from IIa to the Y mark on the platen glass. 6 Next, the page on the platen glass ■
/■ is set in the exposure position on the platen glass with the page facing down in the above-mentioned reversing process (step 17), and the copying machine starts the exposure process.

σ=D Manuscript page (■/(If Excellent is A3, the above A
Exposure ends (s t e p l O) in the same way as in item -11.
Wait for the paper ejection pre-processing (stepH) and paper ejection post-processing (stepH).
In step 5 (step 12), the page ■/- is conveyed to a position spanning from the platen glass to the sheet path ma to the sheet path IVa, and in the first separation process (step 2), the next original page ■/■ is separated, and thereafter ■=D As shown in section 2, by feeding and discharging the original, and by reversing the document, the page is placed face down on the platen crow.

■=1 During exposure of the side of original page ■, partition arm 2
2 hangs down due to its own weight, and sensor R5 turns on, ending the exposure (as in the case of single-sided original @, 1) above.
In step 14), sheet pass IIIa → lVa → original i
The paper is ejected to the i machine (step!, 7).

・Dan) At this point, one cycle of the manuscript is completed, but as mentioned in A-14
If you need to go through one more cycle as in the section, 5 step 1
In step 5, it is determined whether the original has returned and the duplex mode processing is started again.

(Thus, by performing the above-mentioned operations one after another for the originals loaded on the loading table l, the originals are finally placed on the loading table l on the 7-ray T of the copying machine 100, as in the case of section A above. Two single-sided or double-sided copies with the same page order as the set original are obtained.

Effects As described above, according to the present invention, if the fed original and the ejected original rub against each other when exchanging originals, the amount of overlap between the fed original and the ejected original is kept constant regardless of the size of the original. , it is possible to prevent jams and 48 scratches on the document, and to carry out good document conveyance.

[Brief explanation of the drawing]

FIG. 1(a) is an external perspective view of an automatic document feeder to which an embodiment of the present invention is applied installed in a copying machine, FIG. 1(b) is a sectional view thereof, and FIG. 2 is this original MW feeder. An enlarged cross-sectional view of
FIG. 3(a) is a flowchart of the control program, and FIGS. 11 to 13 are operation explanatory diagrams.

Claims (1)

[Claims] A document that is fed in a document conveying device that feeds a document to an exposure position and discharges the document after completion of exposure, and which feeds and discharges the document on the same side and in parallel with respect to the exposure position. 1. A document conveying device that controls document feeding and ejecting operations so that the amount of overlap between the document and the document to be discharged remains constant regardless of the size of the document.