JPS63147735A - Paper feeding control device for copying machine - Google Patents

Abstract

PURPOSE:To input plural types of sheets at a time and automatically obtain plural types of copies at one copying operation by providing a means of inputting the number of sheets for switchover for switching over a paper feeding device. CONSTITUTION:It is checked whether a second side copying mode is being carried out. When the second side copying mode is under way, since the paper feeding tray is a both side tray, the check is returned as it is. When the second side copying mode is not carried out, then, it is checked whether an option tray 33 is selected. When paper feeding is from the option tray 33, since it is out of the object of switchover control, the check is returned as it is. If the option tray 33 is not selected, since either of a first or a second tray 23, 24 is being selected, the swithover control is started. It is checked whether the number of sheets C3 for switchover < the number of set sheets C1 and, when judged negative, the check is returned, whereas, when judged positive, it is checked whether the number of sheets C3 for switchover = the number of sheets C2 for copying and, when it is negative the check is returned but, when it is positive it is checked whether the correction of the jam of the second side is under way.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a copying machine paper feed control device, and more particularly to a copying machine paper feed control device that can be applied to a copying machine having a plurality of paper feeding devices. .

(Prior Art) Conventionally, in order to obtain two types of copy paper for one original in a copying machine, the number of sheets to be set for one type of copy is inputted, the copies are made, and then the other type of copy is made. There is an inconvenience that a double copying operation is required, that is, inputting the number of sheets to be set and making copies again.

(Purpose) The present invention was made to solve the above-mentioned inconveniences of the conventional copying operation, and its purpose is to automatically perform one copying operation by inputting the number of multiple types of sheets at one time. An object of the present invention is to provide a copying machine paper feed control device that can obtain a plurality of types of copies.

(Structure) In order to achieve the above object, the present invention provides a copying machine paper feed control device used in a copying machine having a plurality of paper feeding devices, which includes a means for inputting the number of copies and a means for counting the number of fed sheets. , means for inputting the number of sheets to be switched to when switching the paper feeding device, and after the start of the copying operation, sheets are fed from the initially selected paper feeding device until the number of sheets fed becomes equal to the number of sheets to be switched, and the number of sheets fed is input. When the number of switched sheets becomes equal, the copying operation is continued by switching to another paper feeding device, and after the number of fed sheets and the number of copies are equal, the original paper feeding device is returned to finish the copying operation. It is characterized by the fact that it is done as much as possible.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 is a schematic diagram illustrating the overall structure of a copying machine to which a copying machine paper feed control device according to the present invention is applied.

In the figure, l is from the illumination unit 14 to the first mirror 15.
, the second mirror 16, and the third mirror 17, and which directs the light that has passed through the lens 10 to the photosensitive drum 7 through the dustproof glass 2. 3 is ADF, 4
is a contact lens, and around the photosensitive drum 7 are an eraser 5, a charger 6, and a drum thermistor 8.
, static elimination lamp 9, quenching charger 11, cleaning unit 12, bias roller 13, FCC (pre-cleaning charger) 25, separation claw 26, separation charger 27, transfer charger 28, developer recovery container 34
, registration roller 35, PTC (pre-transfer charger) 3
6, a developing unit 37, a drum heater 28, and a toner cartridge 39 are arranged. Further, 18 is a fixing unit for fixing the developed transfer paper, 19 is a reversing unit, 20 is a sorter, 21 is a conveyor belt, 22 is a double-sided tray, 23 is a first tray, 24 is a second tray, and 29 is a A paper feeding roller unit, 30 is a vertical conveyance section, 31 is a dust removal roller, 32 is a horizontal conveyance section, and 33 is an optional tray.

Next, a part of the operating section used in the above-mentioned copying machine will be explained using the plan view of FIG. 2. In FIG. 2, 40 is a mode display, 41 is a double-sided key, 42 is a composite key, 43.4
4.45 is a tray selection frame display, 46 is a tray size display, 47 is a tray selection key, 48 is a numeric keypad, 49 is a paper feed tray switching number set counter display, 50 is a copy number set counter display, 51 is a 1 copy execution counter display, 52 is a mode display for setting the display 49, 53 is a mode key for setting the display 49, 54 is a clear/stop key, 55 is a start key, 56 is an ADF key, 57 is the 5ADF key,
58 is a sort key, 59 is a stack key, and 60 is a back paper ejection key.

FIG. 3 is a block circuit diagram illustrating the electric circuit of the above-mentioned copying machine and operation section. In FIG. 3, reference numerals 61 indicate a read-write memory (RAM) 62, a read-only memory (ROM) 63, and a central processing unit (CPU).
) 64 and an input/output controller (Ilo) 65. On the input side of this microcomputer 61, a numeric keypad 48, a clear/stop key 54, a number set key 53 for setting the number of sheets to be changed, a start key 55, a tray selection key 47, a double-sided key 41, a composition key 42, an ADF key 56.5 ADF key 57, a sort key 58, a stack key 59, a back paper ejection key 60, and other keys 60a are connected, and the paper ends from the first tray 23, second tray 24, duplex tray 22, and optional (OP) tray 33 are connected. A paper end sensor 66, a paper discharge sensor 67, and a toner end sensor 68 for detection are connected. On the other hand, on the output side, various mode indicators 40, tray selection frame displays 43, 44
．． 45, counter display 50.51° 49, other indicators 52 such as a mode display 52 for setting the paper feed tray switching sheet number set counter display, various drive motors, paper feed clutch 1. Copying machine loads 69 such as various solenoids, various lamps, and various chargers, and an optical scanner control 170 are connected. Note that reference numeral 71 on the input side is a return signal.

FIG. 4 shows a timing chart of the paper feed clutch, and in the figure, CPLS is a counter that counts pulses for controlling timing, and Ta to Td are the count numbers of timings at which each paper feed clutch is turned on.

Tg is the count number of repeat timing when copying a plurality of sheets, and when repeating, CPLS is set to 1 again here. Tf is the pulse value of the on time of the paper feed clutch. In addition, in the figure, 55 is a start key, 72 is a double-sided tray paper feed clutch, 73 is a first tray paper feed clutch, 74 is an optional tray paper feed clutch,
75 is a second tray paper feed clutch.

The operation flow of the copying machine paper feed control device according to the present invention will be explained below. During the explanation of the flowchart below, CI
is the number of copies set in the copy number set counter 50, C2 is the number of copies in the copy number execution counter 51, C8 is the number of sheets to be switched to the paper feed tray, C4 is the number of sheets remaining in the duplex tray 22, and C1 is the number of sheets remaining in the second side jam correction. Counts the number of sheets fed in single-sided copy mode, C6 is a counter that detects the number of sheets in the duplex tray in double-sided or composite copy mode,
C1 is a counter for turning off the paper feed clutch, C1
l means a paper discharge counter.

The flowchart in FIG. 5 shows the operation of detecting the rise of an operation key, and shows that an operation key such as the numeric keypad 48, clear/stop key 54, start key 55, tray selection key 47, double-sided key 41, composite key 42, etc. This is a flow that detects whether a key has been pressed and performs processing corresponding to each key.

When any one of the operation keys is pressed, if the on-detection flag is 0, the on-detection flag is set to 1 and the process proceeds to the respective processing routine. When the operation key is turned off, the on-detection flag is set to 0. For convenience of explanation below, this routine will be referred to as subroutine 0 (SUBO).

FIG. 6 is a flowchart illustrating subroutine 1 (SUBI) of FIG. 5. This flowchart shows how data from the numeric keypad 48 is transferred to the copy number set counter CI.
This is a program for inputting information to the paper feed tray switching sheet count set counter C3. When the numeric keypad 48 is turned on, it is determined whether the mode display 52 for setting C1 is on. If the mode indicator 52 is off, regarding the setting of ecl to proceed to the CI input flow, if the input flag of the first digit is 0, check whether the numeric keypad 48 is 0, and if it is 0, go to RET, it must be O. For example, the input flag for the first digit is set to 1, and the data on the numeric keypad 48 is input to the first digit. Next, if the numeric keypad is pressed again, the first digit has already been entered manually, so proceed to the input flow for the second digit. If data has already been entered in the second digit, R
ET, and if it has not been input (if the second digit is off), enter the data of the first digit in the second digit, and input the data in the first digit.

If the mode display 52 is on, proceed to the input flow of C1. Regarding the setting of C1, if C5 is all off, that is, if the paper feed tray switching sheet number set counter display 49 is all off, then the numeric keypad Check that the data in 48 is not zero and enter the data on the numeric keypad 48 in the first digit.0 Next, when the numeric keypad 48 is pressed again, C1 is not completely off, so check if the second digit is off. Check, if the second digit is not off,
If the light is off, move the first digit to the second digit and enter the data on the numeric keypad 48 into the first digit.

FIG. 7 is a flowchart explaining subroutine 2 (SUB2) in FIG.
This is an operation flow for clearing 0.51 and interrupting the copying operation. It is checked whether the clear/stop key 54 is on, and if it is on, it is checked whether copying is in progress. If copying is not in progress, the clear function clears the counter, and if copying is in progress, the stop function interrupts the copying operation.

Regarding the clear function, if the mode display 52 is off, it clears the counter display 50, 51, sets the 1st digit input flag to zero, and executes subroutine 11 (SUB 11), which is a program that returns the paper feed tray to its original state, which will be described later. )I do.

Sets the stop flag for the stop function.

Note that this stop flag is also set by paper end, toner end, etc., and is executed in subroutine 13, which will be described later.
(SUBI3) is used when determining whether to repeat or not. If the flag=1, the copy paper fed so far is ejected and stopped without repeating.

FIG. 8 is a flowchart illustrating subroutine 3 (SUB3) of FIG. 5, which relates to setting and resetting the mode for setting the paper feed tray switching counter display 49. When the switching number set key 53 is turned on, it is checked whether the mode display 52 is on or not.
If it is off, it is turned on, and if it is on, it is turned off. If the mode indicator 52 is on, the switching number counter indicator 49 can be set.

FIG. 9 is a flowchart explaining subroutine 4 (SUB4) in FIG. 23 → Option tray 3
3→second tray 24→first tray 23.

FIG. 10 is a flowchart illustrating subroutine 5 (SUB5) of FIG. 5, which relates to processing of the start key 55 for instructing the start of a copying operation. When the start key 55 is turned on, the copying flag is set to 1, the stop flag is set to 0, the timing control pulse counter (CPLS) is set to 1, and loads necessary for various copying operations are turned on.

Then, a subroutine (SUB12), which will be described later, is executed as a paper feed tray switching program at the mid-start.

FIG. 11 shows a predetermined time (
For example, it is a flowchart explaining a subroutine (SUB6) that interrupts and processes every (l m5ec ).

When an interrupt occurs, it is checked whether the timing control pulse counter CPLS is zero, and if it is zero, the process returns. If CPLS is zero, it means that copying is not in progress. When the start key 55 is turned on in subroutine 5 (SUB5), CPLS is set to l.

Therefore, if it is 1 or more, copying is in progress. If CPLS is not zero, this CPLS is incremented by 1 and the following paper feed clutch on-timing check is performed.

Since paper is fed from the duplex tray 22 in the second side copy mode (when the back side is folded in the double-sided copy mode, when the second side is copied in the composite mode), as shown in the timing chart of FIG. 4, Td (comparison pulse value ), and also compared with the values of Tc when paper is fed from the first tray, Tb when paper is fed from the optional tray, and Ta when paper is fed from the second tray. If these values and C
When the PLS value fails, subroutine 7 (SUB'/) for paper feed tray switching control and subroutine 8 (SUB8) for paper feed clutch on control, which will be described later, are executed. After passing through subroutine 8, subroutine 13 (SUB 9) for paper feed clutch on control and repeat timing control subroutine 13 (SUB L 3) J, which will be described later.
fi: Execute.

FIG. 12 is a flowchart of subroutine 7 (SUB?), which is a program that checks whether or not to switch the paper feed tray at the paper feed timing, and if there is a condition for switching, switches.

First, check whether the second side is in copy mode. If the second
If it is double-sided copy mode, the paper feed tray is double-sided tray f, so the process returns directly. If it is not the second side copy mode, then it is checked whether the option tray (OP tray) 33 is selected. If the paper is fed from the option tray 33, it is not subject to switching control, so the process returns as is. If the option tray 33 is not selected, either the first or second tray 23, 24 is selected, and a switching control program is then entered.

Check whether Cs (number of sheets to be switched) < C+ (number of sheets set); if not (N), return; if positive (Y), check whether C1 - Cx (number of copies); if not Returns, and if positive, checks whether or not second side jam correction is in progress. Since the second side jam correction will be described later, only the case where it is negative will be described here. If not, then it is determined whether the switching flag 1.2 is zero. This switching flag 1.2 refers to switching flag 1 and switching flag 2, and when switching from the first tray 23 to the second tray 24, it is set to the switching flag 2-1, and when switching from the second tray 24 to the first tray 24, When switching to , the switching flag is set to 1←l. Here, if both flags are zero, the switching has not been done yet, so check the switching. If the first tray 23 is selected, check the paper size and paper size of the second tray 24, and check if the paper size is the same with the paper size. If it is the size, the tray is switched to the second tray 24 and the switching flag 2 is set to 1. If the second tray 24 is selected, check the paper size and paper size of the first tray 23, and if there is paper and the same size, switch to the first tray 23 and set the missed cut flag 1 to 1. set. At this time, the value of Ta or Tc is entered into CPLS.

By entering this value, the paper feeding timing of subroutine 8 (SUB8), which is the next execution routine, can be switched.

FIG. 13 is a flowchart of subroutine 8 (SUB8), which is a program for turning on the paper feed clutch of the selected tray. When each selected paper feed clutch is turned on, C□ is set to +LL, the TfO value is entered to C7, and a counter that counts the number of sheets fed in the first side copy mode during second side jam correction is set. Increment Cs and return. Since the value of Tf has been entered into the counter C for controlling the on-time of the clutch, the clutch starts subroutine 9 (SUB) after the Tf pulse.
9) The counter Ch that counts the number of sheets of paper in the duplex tray 22 in the duplex or composite copy mode is incremented by +1 in the first side copy mode and is decremented by -1 in the second side copy mode. As a result, the number of copies in the duplex tray 22 is always displayed.

FIG. 14 is a flowchart explaining subroutine 9 (SUB9), which is the C? set in subroutine 8. This is a program that decrements the contents of the paper feed clutch off counter (sheet feed clutch off counter) by 1 at the time of an interrupt, and turns off the clutch when the counter reaches zero.

After the clutch is turned on, the clutch is turned off after a Tf pulse, and the paper is fed during this time.

FIG. 15 is a flowchart illustrating subroutine 10 (SυBIO), which is a program for the timing of returning the paper feed tray that has been switched for the number of sheets C1 to the original paper feed tray. This program detects the rise of the return signal 71 of the optical scanner 70, compares CI (number of sheets set) - CS (number of copies) at this time, and if positive (Y), executes subroutine 11 (SUB 11). Positive means that scanning of the final copy has been completed. Subroutine 11 is a program for returning the paper feed tray to its original position.

FIG. 16 is a flowchart illustrating the above-mentioned subroutine 11 (SUBll), which is a program that returns to a predetermined paper feed tray f when switching flag 1 or switching flag 2 is 1. If the switching flag = 1, the second
If the switching flag is 2-1, it is switched to the 11th tray C23 and the flag is set to 2-0.

FIG. 17 is a flowchart explaining subroutine 12 (SUB 12), which shows that if CI (number of sheets set)≠CZ (number of copies) at the start of copying, C2 and C1
This is a program that compares and switches the paper feed tray. This program is for subroutines. First, if C3 is not zero and CI > CI,
If the second side jam correction is not in progress, the switching flag is 1.2.
If it is zero, confirm that it is not the second side copy mode, and if C2≧C1, switch the tray. C2
If is equal to or greater than 03, it means that the copying before switching has finished, so it is necessary to switch immediately at the start time.
5 sheets, when copying is started with the first sheet set in the first tray 23.
Suppose that the first copy jams during ejection. At this time, the number of normally copied sheets is two in the first tray 23, two in the second tray 24, and four in C2. The tray is after scanning the 5th sheet, so it is the first tray of the original tray.
It has returned to tray 23. Therefore, the next time you want to obtain a copy of the jammed copy, you must immediately make a copy of the jammed copy in the second tray 24. Therefore, by using this program to make a copy in the second tray 24 after copying has started, the remaining copies can be made in the second tray 24. Paper can be fed from two trays.

FIG. 18 is a flowchart illustrating subroutine 13 (sUBl 3), which is included in subroutine 6 and is a repeat timing control program. To obtain copies for the set number (CI), CI
It is necessary to feed the paper twice.

This program repeats this 01 times. When CPLS reaches Tg, as shown in FIG. 4, it is time to check whether or not to repeat the process. At this time, check that 01 and Ct are not equal, and again
Set PLS to 1. By doing this, the paper feed clutch is turned on again at a predetermined timing, and the paper is fed. If C6≠C2, the stop flag is 1
If so, return without putting 1 in CPLS.

By doing so, when the stop flag is set by the stop key 54, the repetition is stopped.

Note that the stop flag is also set by paper end, toner end, etc., and is reset at the start of subroutine 5.

FIG. 19 is a flowchart illustrating subroutine 14 (SUB 14), which is a program that corrects the counter when a copy jam occurs and corrects the paper feed tray at this time.

When a jam occurs, the discharged sheet number counter C1 is copied to the copy sheet number counter 51. Normally, this counter 51 is incremented at the time of paper feeding. Therefore, in the case of a jam, it is necessary to switch to the number of ejected sheets and correct the 0th order, C, >C.
, it becomes necessary to return to the initial tray, so subroutine 11 is executed. At this time, if there is a copy jam on the second side in the second side mode, the value of C8, which is the number of remaining sheets in the duplex tray 22, is stored in 04.

For example, if you start copying after selecting the first tray 23 with CI set to 5 and Os set to 2, and the first copy jams after C8 becomes 2, then after C5-Cz becomes Therefore, the tray is the second tray 24. However, since Ct switches from 2 to zero, CI>Ct.

This subroutine 14 performs the operation of returning the tray to the original first tray 23 at this time.

FIG. 20 is a flowchart illustrating subroutine 15 (SUB 15), which is a program for incrementing a paper discharge counter C.

The paper discharge counter C@ is incremented by 1 based on the signal from the paper discharge sensor 67.

Next, a description will be given of correction when a copy jam occurs on the second side in duplex or composite mode. The difference between the duplex mode and the composite mode is that when the first side copy enters the duplex tray 22, it is reversed in the duplex mode, whereas in the composite mode, it enters the duplex tray 22 without being reversed. Therefore, the duplex mode and the composite mode are basically the same in other respects.

Describes the operation in double-sided or composite mode above0
When the duplex or composite mode is set using the key and printing is started using the start key 55, the paper with the first side copied is placed in the duplex tray 22 as a CI sheet. At this time, CI is also incremented, and as in subroutine 8, CI-C
When the first side copy of the 0th page h has finished entering the duplex tray 22, the second side copy mode is automatically entered, and the paper is fed from the duplex tray 22 at the start of the next printing. And again CI
The second side is copied and ejected. At this time, C6 is decremented to zero and ends. When finished, the screen returns to the first page mode. Although this operation is the basic operation of the conventional double-sided or composite mode, the part regarding C4 is directly related to the present invention.

Next, a description will be given below of what happens when a jam occurs during copying of the second side. When a jam occurs on the second side, there are two main actions.

First, a case will be described in which there is already no paper in the duplex tray 22 at the time of the jam. C1 (number of sheets set) is 5, CI
(Number of sheets to be switched) is set to 2, the first tray 23 is selected, and the start key 55 is turned on.

Then, as shown in FIG. 21, two sheets of paper fed from the first tray 23 enter the double-sided tray 22.

Next, the system switches to the second tray 24 and the remaining three sheets enter the double-sided tray 22 fed from the second tray 24. This completes the copying of the first side.

Next, as shown in FIG. 22, when the start key 55 is turned on, paper is fed from the duplex tray 22 (from the paper fed from the second tray 24) and the second side is copied. If the 5th sheet (the paper from the first tray 23) is jammed, the 5th sheet has already been fed from the duplex tray 22, so the 2nd sheet (the paper from the first tray 23) is jammed. That means you did it. Here, 3 copies from C2, 2 missing copies (first tray 23), and C4 (double-sided tray 2)
2) will be zero. After the jam is cleared, when the start key 55 is turned on, the first side copying operation for second side jam correction is started, as shown in FIG. At this time, it has already returned to the first tray 23 (at the time of return of the final scanner for copying the first side, the first
When two sheets have been fed, the first side copying of the missing copy is completed, so the tray is stopped and the second side copying is started. When the mode is entered and started, the paper in the duplex tray 22 is fed and a second side copying operation is performed, and if the paper is normally ejected, it means that the jam correction has been completed.

Furthermore, as shown in FIG. 24, if the third copy paper jams, there are three copies missing (two sheets in the first tray 23 and one sheet in the second tray), that is, in this case, Ct" ”2
, the number of missing copies is two on the first tray 23, one on the second tray 24, and C4 is zero. In such a case, as shown in FIG. 25, the first side copying for jam correction is completed by feeding two sheets from the first tray 23 and one sheet from the second tray 24. After feeding two sheets from the first tray 23,
In subroutine 8, CS (number of fed sheets) becomes 2, and at the next paper feeding timing, in subroutine 7, CS”Cx
- Passes check C4. At this time, C3=2, C3-2
, C4-0, it becomes positive and switches to the second tray 24. When one sheet is fed from the second tray 24, insufficient copying ends, and the first tray 23 is switched to finish the first side copying. Next, the second side copying is started and the corrected copying is completed.

Next, a case where there is still paper left in the double-sided tray 22 at the time of a jam will be described. 1st tray 2 with CI 1O1C5 3
3 and turn on the start key 55, the 26th
As shown in the figure, the first side copy enters the duplex tray 22.
Next, if the fifth sheet jams after starting copying on the second side, there will be two missing copies (sheets in the second tray 24). Apparently, there is still some paper left. Here 02 is 4 pieces, C4 is 4 pieces
It is one piece. Next, copying of the second side of the remaining paper is continued as shown in FIG.

Thereafter, as shown in FIG. 29, the jam correction mode is entered. Since there are four C4 sheets (C4 is stored in subroutine 14 at the time of jam in FIG. 27), subroutine 12
When C1≧C2 is checked, Cm"4.C3■3 is positive (Y), and the paper is switched to the second tray 24. Therefore, the missing two sheets are fed from the second tray 24,
The copy is returned to the first tray 23 and copying of the missing copy on the first side is completed.

Then, as shown in FIG. 30, if copying on the second side is started and the paper is ejected, the missing copy has been ejected.

Next, if there is still paper left in the duplex tray 22 at the time of a jam, the missing copies will be transferred between the paper in the first tray 23 and the paper in the second tray 22.
Explain the case where the paper becomes . FIG. 31 is the same as FIG. 26. FIG. 32 shows a case where a jam occurs on the seventh sheet when copying the second side.

At this time, there is one jammed paper in the first tray 23 and one jammed paper in the second tray 24. As shown in FIG. 33, the second side of the paper remaining on the double-sided tray 22 is copied, and the
The jam correction mode is set as shown in the figure. At this time Ca
<Since there are 2 sheets of 04 and 3 sheets of C2 under the conditions of Cs, there is no switching in subroutine 12, and after one sheet is fed from the first tray 23, C5-t is reached, so the subroutine is executed at the next sheet feeding timing. The check of Cs "Cs-Ca at step 7 is positive (Y) and the switch is made to the second tray 24. One sheet is fed from the second tray 24, the first side copying of the missing copy is completed, and the 1 Return to tray 23 and stop 0
Next, when the start key 55 is turned on, copying of the second side is started as shown in FIG. 35, and the copying of the missing copies on the second side is completed.

The above is an example of the jam correction operation when copying on the second side in duplex or composite mode. To summarize this operation, firstly, when a copying jam on the second side occurs, the remaining sheets in the duplex tray 22 @C4 If is equal to or greater than the number of sheets to be switched C1, it means that the copy up to C8 is not included in the jam board, and it can be seen that the jammed paper is the paper in the paper feed tray after being switched. Therefore, when correcting a jam,
The program is like this because it is necessary to switch trays immediately after starting and perform the operation for insufficient copies.

Second, if the number C4 remaining in the double-sided tray 22 is less than or equal to the switching number C1 at the time of the second copy jam, it can be seen that the jammed paper contains the copy before switching. Therefore, when correcting a jam, start without switching immediately,
This type of program is used because it is necessary to switch over once the paper has been fed for the missing copies before switching and obtain the missing copies again.

(Effects) As described above, according to the present invention, after the start of the copying operation, sheets are fed from the initially selected paper feeding device until the number of sheets fed becomes equal to the number of sheets switched, and the number of sheets fed and the number of sheets switched are When they become equal, the copying operation is continued by switching to another paper feeding device, and after the number of fed sheets becomes equal to the number of copies, the original paper feeding device is switched back to finish the copying operation. A copying machine that has the effect that when it is desired to obtain two types of copy paper for one sheet of original, the same copying operation can be performed as when obtaining one type of copy paper from one sheet of original. A paper feed control device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall structure of a copying machine to which a copying machine paper feed control device according to the present invention is applied, FIG. 2 is a plan view showing a part of the operating section of the copying machine shown in FIG. 1, and FIG. is a block circuit diagram schematically showing the electric circuit of the copying machine shown in Fig. 1, Fig. 4 is a tie-up chart of the paper feed clutch, Fig. 5 is a flowchart showing the operation of detecting the rise of the operation key, and Fig. 6 is a subroutine. 7 is a flowchart explaining subroutine 2, FIG. 8 is a flowchart explaining subroutine 3, FIG. 9 is a flowchart explaining subroutine 4, FIG. 10 is a flowchart explaining subroutine 5, 11 is a flowchart explaining subroutine 6, FIG. 12 is a flowchart explaining subroutine 7, FIG. 13 is a flowchart explaining subroutine 8, FIG. 14 is a flowchart explaining subroutine 9, and FIG. 15 is a flowchart explaining subroutine 10. 16 is a flowchart explaining subroutine 11, FIG. 17 is a flowchart explaining subroutine 12, FIG. 18 is a flowchart explaining subroutine 13, FIG. 19 is a flowchart explaining subroutine 14, Fig. 20 is a flowchart explaining subroutine 15, Fig. 21 is a schematic diagram showing copying on the first side when there is no paper in the duplex tray in duplex or composite mode, and Fig. 22 is a copying jam on the second side. Fig. 23 is a schematic diagram showing when the second side jam is corrected, Fig. 24 is a schematic diagram showing the second side copying jam, Fig. 25 is a schematic diagram showing the tray switching when the second side jam is corrected. Fig. 26 is a schematic diagram showing when the first side is copied when there is still paper left in the duplex tray in duplex or composite mode, and Fig. 27 is a schematic diagram showing when the second side is in a jam. , FIG. 28 is a schematic diagram showing the start of printing after jam removal, FIG. 29 is a schematic diagram showing the first side copying when the second side jam is corrected, and FIG. 30 is a schematic diagram showing the second side copying when the second side jam is corrected. A schematic diagram showing two-sided copying; FIG. 31 is a schematic diagram showing the first side copying in another case where paper still remains in the double-sided tray;
FIG. 32 is a schematic diagram showing the second side copying jam, FIG. 33 is a schematic diagram showing the start of printing after jam removal, and FIG. 34 is a schematic diagram showing the first side copying when the second side jam is corrected. , FIG. 35 is a schematic diagram showing copying of the second side when a jam occurs on the second side. C5...Number of set (copy) sheets, C8...Number of fed sheets,
C1...Number of sheets to switch, 22...Double-sided tray, 23
...First tray, 24...Second tray, 50...
Copy number set counter, 51... Copy number execution counter, 49... Paper feed tray switching number set counter. Figure 4 R Figure 8 Figure 9 Figure 13 Figure tail 15 Figure 19

Claims (1)

[Claims] A copying machine paper feed control device used in a copying machine having a plurality of paper feeding devices includes a means for inputting the number of copies, a means for counting the number of fed sheets, and a means for inputting the number of sheets for switching the paper feeding device. After the copying operation starts, paper is fed from the initially selected paper feeding device until the number of fed sheets becomes equal to the number of switched sheets, and when the number of fed sheets becomes equal to the number of switched sheets, another sheet is fed. A copying machine paper feed control device, characterized in that the copying machine paper feed control device is configured to switch to the original paper feeding device to continue the copying operation, and after the number of fed sheets and the number of copies become equal, to return to the original paper feeding device to finish the copying operation. .