JPS5860760A - Controlling method for copying machine - Google Patents

Abstract

PURPOSE:To facilitate the jam recovery with a simple constitution to perform the double-faced copy without page disorder, by correcting contents of a feed paper number counter to the value of an eject paper number counter only in case of the front face when a jam occurs. CONSTITUTION:The transfer paper fed from a cassette 1 is transferred to a gate 17 and an auxiliary path 18 after the front face copy and is reversed and is carried to an intermediate tray 24 through a gate 27. This transfer paper is subjected to the rear face copy and is ejected to a copy tray 16. The next transfer paper is subjected to the copy processing similarly, and both-faced copies are ejected to the tray 16 without page disorder. The front face copy or the rear face copy during which a jam occurs is detected by a transfer paper detecting sensor 31 or 30 provided on carrying rollers 23 and 26 for trays 24 and 16; and only when the jam occurs during the front face copy, contents of a feed paper number counter are corrected to the value of an eject paper number counter, and thus, the number of copies is not disordered even in case of a jam during the rear face copy by a simple constitution, and the jam recovery is facilitated by recopy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine capable of double-sided copying, and particularly to a copying machine capable of double-sided copying.
Regarding the improvement of the control method of a copying machine capable of double-sided copying that has a document feeder (hereinafter referred to as ADF), the present invention aims to facilitate jam recovery and obtain double-sided copies without page errors with a comparatively simple construction. This is what I did.

Conventionally, copying machines capable of double-sided copying are: (1) a copying machine that does not perform count correction regardless of whether it is copying the front side or the back side; (2) a copying machine that does not perform count correction regardless of whether it is copying the front or back side; A copying machine that performs correction has been proposed.

Therefore, if the number of sheets is not corrected regardless of whether the front side is being copied or the back side is being copied on a duplex capable copying machine, if a jam occurs during front side copying, the number of sheets stocked in the intermediate tray will be lower than the set number. The number of sheets is short by the number of sheets that were jammed.

Therefore, if the back side is copied as is, the front and back pages will not match because there is not enough transfer paper stocked in the intermediate tray and the front side has been copied. Furthermore, if the number of sheets is corrected regardless of whether the front side is being copied or the back side is being copied, there is no problem with a jam during front side copying, but there is a problem with a jam during back side copying, in which the pages do not match. In particular, automatic document feeder ff1ADF'
) If you go to a copying machine that has a paper jam recovery method, it will be troublesome to deal with the jam recovery. In other words, when making double-sided copies from double-sided originals using a copying machine with an ADF, since the ADF feeds the originals one after another, it is first necessary to copy only one side of the original onto one side of the transfer paper. In this case, transfer sheets with different pages copied thereon will be stacked. If a jam occurs while copying the back side in this state and you correct the number of sheets at this time, the page separators will be misaligned and -
(There is a problem that the 4th page is copied even though 2 pages should be copied on the back side of the 1st page.) The present invention corrects the above-mentioned problems of the prior art and can be done relatively easily. This configuration facilitates jam recovery and provides double-sided copies without page errors.

FIG. 1 shows one part of the automatic double-sided copying machine according to the present invention.
This is a schematic front view for explaining [1]. There are three paper feed slots, but since their functions are the same, only one of them is shown.
The process from paper feeding to paper ejection will be explained below. In FIG. 1, when a double-sided copy operation is not being performed, first, several pages of paper in a cassette 1 are sent to a pair of separator rollers 3 by a calling roller 2, and the dark top sheet is sent to a registration roller 4. At this time, the photoreceptor 5 is
The static electricity is uniformly removed by an optical static eliminator 6, then uniformly charged by a charger 7, and erased by a light source 8 according to the size of the transfer paper.
The upper original image is exposed using the optical system 0. An electrostatic a-image is thus created and visualized by the developing device 11, and the registration roller 4 starts conveying the transfer paper toward the photoreceptor 5 at the timing when the leading edge of the image and the leading edge of the transfer paper are synchronized. The transfer paper that overlaps the developing image on the photoconductor is uniformly charged from the back side by the transfer charger 12, and the toner image moves to the paper side. The sheet is peeled off from the sheet and sent to the conveyor belt 14, then fixed in a fixed manner by the fixing device 15, and discharged onto the copy tray 1, completing the one-shot copying process.

Here, in the double-sided copy mode, for example, if we consider that a 3 page (odd page) original (it doesn't matter whether it is a single-sided or double-sided original) is to be double-pressed copied onto two sheets of transfer paper, the first copy is , constant k'' after passing through the device 15,
Since the gate 17 is located at the broken line, enter the auxiliary road 18,
After the trailing edge of the paper begins to pass through the rollers 19, the trailing edge of the paper enters between the rollers 19.2 and into the path ρ due to the rotation of the roller pair 20. Roller 1 rotates relatively quickly, and the moment the end of the paper passes through rollers 19 and 21, it is stacked onto the intermediate tray with great force. Next, the original is placed so that two pages are exposed, the shift feed roller 5 is turned on by the print switch, and the previously stacked one-sided copy paper is passed through the registration roller 4, and the two-page image is printed on the other side. After fusing, the transferred copies pass through rollers 19, 26 and are stacked on copy tray 16. At this time, the copies are stacked with the first side facing down and the second side facing down, as shown in Figure 2. Next, when the third copy, which is the last page and the odd numbered page, is ejected as it is after copying, the third copy is stacked upside down and the second copy is ejected, as shown in Figure 2. There is a problem that there is a blank page after the page, and then there are three pages. To solve this problem, stack the third copy on the intermediate tray 24, press the start key again, and turn off the image forming process, or leave it as it is and copy the white part of the pressure plate. This is a method in which the device 15 is expanded and ejected, and in this way, as shown in FIG. 3, it is possible to obtain copies in which the pages are stacked correctly in the order of pages. Another method for achieving this is the method of the present invention, in which the third copy paper, which is the last page and odd-numbered page, follows the roller 19 after fixing, and then reaches the state shown by the broken line. First enter the auxiliary road 18 through a certain gate 17,
After removing roller 19, roller 20, rollers 19, 2
1. At this time, if the gate 27 is positioned on the broken line, the paper is turned by the gate r and heads toward the discharge row 226, and as a result, the paper is stacked in the state shown in FIG. 3.

FIG. 4 is a diagram showing an example of the operation section of a copying machine to which the present invention is applied, in which a table (]) is used to set the desired number of copies.
0) Key 40, set number and copy number display 41 for displaying the number of copies set using the numeric keypad and the number of copied copies, clear stop key for clearing the set number to 11 and interrupting the copying operation. 42. Paper feed selection key 43 for selecting one of the three paper feed ports
, a size display 44 for displaying the transfer paper size set in each paper feed port and the selected paper feed port, an aperture key 45 for adjusting the degree of copying, and an aperture stage. a failure indicator 46, a failure error indicator 47 for indicating jams, toner shortages, etc., a duplex key 48 for specifying duplex copying, a last page key 49 for specifying that the duplex copy is the last page at the same time, and , a copy key 50, etc.

FIG. 5 is a flowchart for explaining an example of the control method according to the present invention. Hereinafter, as in the case described above, a case will be described in which double-sided copying is performed from a three-page original onto two sheets of picture paper. First, when copying the first page, the process indicated by route ◯ in the flowchart is performed. That is, at this time, the double-sided copy mode is selected by the double-sided key 48, flag A is "0", and the last key 49 is not pressed, so the route ■ is taken. Become. In route ■, turn on solenoid 5OLI.
Then, turn off solenoid 5QL2. Here, 5OL
1 is a solenoid for switching the gate 17;
When in the ON state, 12 is moved to the position (broken line position in Figure 1) that guides the transfer paper to the auxiliary path, and when in the OFF state, it is moved to the position where the transfer paper is discharged to the copy tray I6 (1
(solid line position in the figure).

In addition, when 5OL2 is in the ON state, the gate 27 is displaced to the position (broken line position in FIG. 1) for discharging the transfer paper along the row 221 to the copy tray 16, and when it is in the OFF state, the gate n is The position where paper is guided to the intermediate tray 24 (first
(solid line position in the figure). Therefore, 5OLI ON
, 5QL2 OFF, the transfer paper is reversed in the auxiliary path 18 and stocked separately in the middle tray.

When the first page has been copied for the set number of sheets, flag A is set to "1" and the second page is copied.

- Go into action. Copying the second page is accomplished by the process of route (3). In this route ■, electromagnetic clutch CL4
As a result, the copy sheets stacked on the intermediate tray U that have been copied on one side are fed to the photosensitive drum 5 at the same time, but at this time, since both 5OL1 and 5OL2 are OFF, the transferred paper on which double-sided copying has been completed is not copied. The paper is delivered to the tray 16 with the first page facing down. Next, before starting the copying operation for the third page, the operator presses the last page key 49 to make the machine recognize that it is the last page. In the case of last page copy, the root CG) is processed.
In this route 0, the transfer paper is supplied from the upper tray by the electromagnetic clutch CLI, and since both 5QL1 and SQL 2 are ON, the transfer paper is guided to the auxiliary path 18.
rollers 2] and is discharged onto the copy tray 16 with the third page facing down.

In addition, in the flowchart of FIG. 5, flag A is "0" when 1. odd page copy is temporary, and flag AV'1rlJ is when even page copy is temporary, so if the last page is an even page, even if the last page key is pressed. Since the transfer paper passes through the route stop 1, it is ejected to the copy tray 16 without being reversed.0 Figure 6 is a diagram showing the operation section in which the operator sets the number of pages of the original before starting the copying operation. However, in this method, the last page key 4 is different from the operation section shown in Fig. 5.
9 is different from the original page setting key 51 in that the operator presses the original page setting key 5 at hand before starting copying, and then inputs the number of pages of the original into the machine using the numeric keypad 50. input.

Figure 7 is a ten (10) key manual processing flow diagram.
If the number is entered using only the keys, the input data is stored in register A that stores the number of copies, and if the number is entered after pressing the original page key, the input data is stored in register B that stores the number of pages of the original. Stored.

FIG. 8 is a control flowchart, and similarly to the above, a case will be described in which double-sided copying is performed from a three-page document onto two sheets of transfer paper (assuming that the upper paper feed port is selected). First, when copying the first page, use Lou) LA'
) processing is performed, but at this time, as in the case of Fig. 5, 5OLI is ON and 5QL2 is OFF, so the transfer paper is set to the 01st page that is stocked in the intermediate tray 24 after copying is completed. When the number of copies has been made, flag A is set to "1", and document page register B is set to "-".
1” is done. Copying the second page is processed by route 13) because flag A is "1", but in route (B), both SQL 1 and SQL 2 are OFF, so
The transfer paper after double-sided copying is placed in the copy tray 16.
The paper is ejected with the page facing down. When the second page is copied by the set number, 7lag A is reset to "0" and register B is set to "-1". Since the initial value of register B is "3", the content of register B becomes "1" when the number of sheets set for the second page is completed. Therefore, copying the 3rd page goes through route ◎, but in this route ■, both SQL 1.5QLZ are ON, so the transfer paper is on the 5th page.
In the same manner as described in the figure, the third page is discharged onto the copy tray I6 with the third page facing down. In the case of the flowchart in Fig. 8, as in the case of Fig. 5, if the page is an odd number, flag A is "0", so the process of route ■ or route (Q) is performed, and if it is an even page, the flag Since A is "1", the process for route (B>) is performed. Therefore, if the last page is an even page, the transfer paper is ejected to the copy tray 6 without being reversed since it passes through route (Y). become.

FIG. 9 is a schematic diagram of the automatic document feeder (hereinafter referred to as ADF) installed in the full-face copying machine shown in FIG.
The original 71 loaded on the original placing table 70 is moved by the feed roller 7
2 and the conveyor belt 73 to the document table 74 where it is exposed and scanned. After the exposure scan is completed, the document is conveyed to the document table 74 again by the conveyor belt 73.
3 and stocked on the document tray 75.

Now, if we consider the case of making double-sided copies from double-sided originals using the ADF, initially only one side of all originals will be copied, so the intermediate tray 24 (first section 1) will have one-sided copies of all originals. In this case, if you want to make three copies from three double-sided originals, the intermediate tray will hold three copies of the first page and three copies of the third page. A total of nine sheets will be stacked, including three copies and three copies of the fifth page.

Next, the original is set in the ADF with the even-numbered page facing up, and is conveyed in the order of the second page, the fourth page, and the sixth vane. The intermediate tray is configured to feed the transfer paper from the bottom, so the first, third, and fifth pages are fed in that order.

That is, the second page is copied on the back side of the first page, the fourth page is copied on the back side of the third page, and the sixth page is copied on the back side of the fifth page, and the copies are discharged onto the copy tray 16.

Next, a method of handling when a jam occurs will be explained. 1st
In the figure, there is a transfer paper detection sensor: 3t on the paper discharge roller 26 and the conveyance roller to the intermediate tray 24. i
Both sensors detect a jam if the transfer paper does not arrive within a specified time. Now, when the transfer paper jams between the paper cassette and the intermediate tray,
In other words, if a jam occurs on the front copy, the first
As shown in FIG. 0, the content of the paper discharge counter CN3 to the intermediate tray is transferred to the paper feed counter CNI from the paper feed cassette, and is corrected to the number of sheets that have been completely discharged. Therefore, if the jammed paper is removed and the process is restarted, the intermediate tray will always be stocked with a number of single-sided copy sheets equal to the set number of sheets.

Next, if the transfer paper jams between the intermediate tray and the copy tray, the paper feed counter CN2 from the intermediate tray will not be corrected, so the set number of transfer papers will be printed regardless of whether there is a jam or not. Once the paper is completed, double-sided copying is complete. Therefore, if a jam occurs, the number of transfer sheets that have been subjected to double-sided copying and are ejected to the copy tray will be less than the set number by the number of jammed sheets. In this case, it is necessary to set the original at the time of the jam by the number of missing sheets and copy again, but it is less time consuming and expensive compared to the problem of copying pages that do not match when the number of pages is corrected even when copying the back side. As is clear from the above description, according to the present invention, jam recovery is facilitated with a relatively simple configuration, and
You can obtain double-sided copies without page errors.

[Brief explanation of drawings]

FIG. 1 shows an example of an automatic double-sided copying machine according to the present invention.
A schematic front view, FIGS. 2 and 3, for explaining an example,
FIG. 4 is a diagram showing the stacking order of copy paper after copying, and FIG.
FIG. 6 is a flowchart for explaining an example of the control method according to the present invention, FIG. 6 is a diagram showing another example of the operation section of a copying machine to which the present invention is applied, and FIG. Flowchart for key manual processing, FIG. 8 is a control flowchart, and FIG. 9 is a flowchart for key manual processing.
1ν(IJJ) if the document feeder (ADF')
FIG. 10 is a flowchart for performing jam processing. 1 Cassette, 5...I photoreceptor, 11...Developing device, 14...Transport belt, 15...Fixing device, 16...
Copy tray, 17・Gate, 18 Auxiliary path, 24・
・・Intermediate tray, moss・gate, 30. 31・Transfer paper detection sensor, 40-ten no) key, 48・Double-sided key,
49.Last page key, 51 manuscript page key. Figure 2 Figure 3 Figure 4 9σ 4p 9do 40 Figure 5 Figure 6

Claims (1)

[Claims] In an image copying table capable of double-sided copying of 15T, there is a jam detection means for detecting a jam in transfer paper, a paper feeding sheet number counter for counting the number of fed transfer paper sheets, and a paper ejecting means for counting the number of sheets for which simultaneous light output has been completed. It has a counter and a copy number display that displays the contents of the paper feed counter.If a jam occurs during copying operation on the front side of the transfer paper, the value of the paper feed number counter is displayed on the ejection soft counter. A control method for a double-sided copying machine, characterized in that the value is corrected, and if a jam occurs during a copying operation on the back side of transfer paper, the feed sheet number counter is not corrected.