JPS624707B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an image forming apparatus. Conventionally, it is known that during a set number of repeated copying operations, if an accident such as a sheet jam occurs, copying is interrupted and a copy count up to that point is retained. However, in this case, the sheet is lost due to the jam, so
When restarting after a jam, if you restart from the count number at the time of interruption, the number of sheets will be insufficient. In order to solve this inconvenience, a method for correcting the number of sheets is known. This has a counter that counts the number of exposures and a counter that detects and counts ejected sheets. Normally, the number of exposure counters is displayed, and when a jam occurs, the number of ejected counters is displayed as the contents of the former counter. This is to ensure that there is no shortage of loss upon completion of copying. However, this requires a plurality of counters that perform counting operations together during the copying operation, resulting in a complicated circuit configuration and increased cost. The present invention eliminates the above-mentioned drawbacks, and provides a transfer type electrophotographic apparatus in which, after the start of feeding, the transfer process,
The next transfer material can be fed into the transfer material path that is discharged after passing through the fixing process before the previous transfer material is discharged.
An input means for setting the desired number of image formations, the length of the path being longer than that of a large-sized transfer material, and the number of transfer materials present in the path depending on the size; and setting of the image forming operation using the input means. A memory that counts and stores the number of times of image formation as the image forming operation progresses, and detects trouble during the image forming operation at the position of the scanning optical system and at a time related to the image forming operation. a means for interrupting the conveyance of the transfer material before it is discharged when a trouble is detected by the detection means; and a means for interrupting the conveyance of the transfer material before it is discharged when the trouble is detected;
An image forming apparatus comprising means for calculating and correcting a number of 1 or 2. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to an example in which a one-chip microcomputer (hereinafter referred to as CPU) is used to control various functions of a copying machine. The operation of a copying machine which is an embodiment of the present invention will be explained with reference to FIG. A document is placed on a document table that constitutes a document placement surface, and is pressed down by a document pressure plate 10.
It is composed of a moving reflecting mirror 6, a lens 17, and fixed reflecting mirrors 18 and 19. Therefore, the original is moved by the movable reflecting mirror 8 which moves in the direction indicated by the arrow A in the figure together with the illumination lamp 9, and by the movable reflecting mirror which moves in the same direction at a moving speed of 1/2 of this movable reflecting mirror 8. 6, while the optical path length is kept equal, the light is exposed to a slit through a lens 17 and fixed reflection mirrors 18, 19, and is imaged onto a drum 30 having a photoreceptor on its surface. That is, the document is exposed to slit light while being scanned by an optical system (illumination section). The surface of the drum 30 has a photoreceptor whose photoreceptor layer is covered with a transparent insulating layer. Becomes electrically charged. Subsequently, when reaching the exposure section 16, the original on the original platen glass is illuminated by the illumination lamp 9, and an image is formed on the drum 30 by a moving reflection mirror, a lens, and a fixed reflection mirror, so that the photoreceptor is exposed to the original image. At the same time, AC static electricity is removed by the AC discharger 13 to which AC high voltage current is supplied from the high voltage power supply. Next, an electrostatic latent image is formed on the surface of the drum (photoreceptor) by full exposure by the full surface exposure lamp 33 and enters the developing device 31 . Development is performed by powder development using a sleeve method, and the electrostatic latent image is visualized. Next, the transfer material is fed from the cassette 21 or 22 by the paper feed roller 24 and transferred to the first roller 25 and the second roller.
Conveyed by roller 28 and timing roller 29
The roller 2 is temporarily stopped by the registration signal.
9 is rotated and the paper is conveyed again. The resist signal is a switch RG that detects a specific passing position in the optical system.
obtained from. The switch OHP generates a signal indicating the optical system home position (stop position). The transferred transfer material comes into close contact with the drum,
A transfer charger 27 transfers the image on the drum onto a copying material using a positive high-voltage current from a high-voltage power source. After the copying material has been transferred, it is separated from the drum by a separation roller 26, guided to a heat fixing roller 4, and after being fixed, excess charge is removed by a static eliminator 3, and the material is ejected onto a tray 20 by an ejection roller. Ru.
Copying is now complete, and the remaining toner on the drum is cleaned by the blade 11 pressed against the drum surface (photoreceptor), allowing the next cycle to be repeated. To avoid complexity, a detailed explanation of the drive system and the sequence and timing of each process will be provided later. A cam installed on the drum operates switch PF to generate a paper feed signal. The switch DHP generates a drum home position signal and stops the drum at the position where the photoreceptor joint contacts the cleaner 11. Reference numerals 23a and 23b denote a lamp for detecting the presence or absence of paper in the cassette, and a light receiving element that receives the light. Reference numeral 2 denotes a paper detection lamp and a light receiving element for detecting paper delay and retention therein. Reference numeral 16 is a blank exposure lamp which exposes the photoreceptor to light to eliminate surface potential unevenness when imagewise exposure is not performed. 7 is a fixing motor, 15 is an optical motor, and 14 is a pre-exposure lamp that fatigues the photoreceptor in advance to make it uniform before the process. Also 36
is a pulse generator consisting of a plate that rotates in conjunction with the drum and an optical detector that detects the holes in the plate. The operation panel of this device is shown in Figure 2. The operator can interact with the CPU via this control section. That is, key groups 21, 22, 23
The CPU indicates a response to the input on the displays 24 to 28. The operator sets the desired number of copies on the display 25 by pressing the numeric keys 0 to 9.
Can be set up to 99. The "CLEAR" key is used to clear the set contents of the display 25 to zero.
The “MULTI” key is used when you want to copy only the desired value shown on this display 25. Once this key is pressed, the machine enters the copying operation and when the optical system reaches the inversion position, the display 26 The value of is increased from 0 to +1. When the set value on the display 25 matches the value on the display 26 indicating the number of sheets copied, the copy operation mode changes to the end mode, and when the copy operation is finished and the photosensitive drum has stopped, the display 26 shows the number of sheets copied. is returned to “0”. Therefore, since the value initially set using the numeric keypad still remains on the display 25, the same number of values for another document will be displayed.
If you want to copy, just press the “MULTi” key again. However, this “MULTi” key is
When the value of 5 is "0" and any of the indicators 24 is lit, it is ignored. “MULTi” copy count is set during copy operation
When the "STOP" key is pressed or any of the display groups 24 lights up before the count number is reached, the copy operation at that point is terminated.
Finish the copy cycle. So for example, set
If the above state occurs when the copy count is “3” for the count “6”, the display 25 will be “6”,
The display 26 is at "3" and is stationary. At this time, all keys in the key group 22 are accepted. Further, after the copy operation is completed, all of the key groups 21 and 22 are accepted. The "SINGLE" key performs a single copy operation regardless of the SET count and copy count numbers. Therefore,
Using this key, interrupt copying is possible only for single-sheet copying. For example, the first operator sets 6 sheets on the display 25 and copies the copy count
When the number of copies reaches 3, the second operator requests to interrupt the copying of one copy, the first operator presses the “STOP” key to end the copying as soon as the third copy is completed, and the first Operator 2 sets his own original and presses the "SiNGLE" key, then the display 25 shows "6" and the display 26
remains stationary at "3", and one page copying for the second operator is completed. Therefore, by pressing the “MULTi” key again, the first operator
You can make copies of the remaining three. If the desired number of copies is not one but a plurality of copies, this can be done using the "INTERUPT" and "RECALL" keys. As mentioned above, when the first operator stops the second operator's interrupt with set count "6" and copy count "3", when the second operator wants to interrupt 2 copies, the second operator The operator presses the “INTERUPT” key, temporarily saves the set count number “6” and the copy count number “3” to another memory, and
After lighting the interupt lamp 28, enter “2” as the set count number using the ten key,
Press the “MULTi” key to complete the two-copy process. After this, press the “RECALL” key and the numbers for the first operator, “6” and “3” will appear on the display 2.
5, 26, the first operator can press the "MULTi" key again to make the remaining three copies. The display lamp 27 "ORIGINAL" indicates that the original can be set or replaced, and goes out during copying. Therefore, since the light turns on when optical scanning of the last paper copy is completed, copying can be started again by immediately replacing the original and pressing the "MULTI" or "SINGLE" key. The indicator lamp 28 “INTERUPT” lights up when you press the “INTERUPT” key.
It disappears when you press the “RECALL” key. "JAM" lights up immediately when a copy paper jam occurs, and puts the copy in end mode. At this time, the display unit 26 causes the CPU to increment -1 or -2 depending on the location where the paper jam occurred and the paper size, thereby ending the copying. Also, when a jam occurs, the operator opens the door of the machine and removes the jammed paper, so the total counter that calculates the copying fee only counts after the paper tray is stored, and jammed paper is not counted. . In other words, both the copy count display and the total counter are guaranteed to count during a jam. The "TONER SUPPLY" display lights up when the toner in the developer unit runs out, and does not affect the start or continuation of copying. "PAPER-SUPPLY" lights up when there is no more paper in the selected cassette, prohibiting the start of copying or terminating continued copying.
"WAIT" is turned on for a period of time until the temperature of the fixing device reaches a desired value and prohibits the start of copying, but once that temperature is reached, the start of copying is enabled and the enabled state is maintained. Switch button “CPPER-CaSSETTE”,
"LOWER-CASSETTE" selects the upper or lower cassette, and the lamp group 25 displays the paper size stored in the selected cassette. If you press the push button switch “AUTO”,
Only when there is no paper left in the selected cassette, or when there is paper of the same size in another cassette.
You can automatically pull out the paper from that cassette and continue copying. (Control Circuit) Fig. 6-1 shows a control circuit for inputting and outputting to the computer, and Fig. 6-2 shows a peripheral circuit for inputting and outputting. In the figure, the CPU is a memory that stores the control program shown in Figure 5 (described later), a memory for saving the operation timing numerical data necessary for program execution, a count value save for copying interrupts, input data, and a logic for decoding the above program. It is a computer chip device whose circuit is included in one semiconductor substrate. The details are shown in FIG. Output a~d
is connected to the display device via a segment decoder 608 in order to display the number of sheets on the display devices 25 and 26.
The output CT is used for column scanning of the input matrix circuit and digit scanning of the displays 25 and 26. The gate circuit G has a so-called decoder function, which is used to combine signals from the chip outputs to obtain more output signals. With this gate circuit
The output of the CPU is given to the input matrix circuit and output interface circuit. 603 and 604 are AND gates, 601, 602 and 606 are inverters, 605 is a Nant gate, 607 is an OR gate, and 609 is a paper detection circuit using a transistor. Each digit of the display is displayed using 7 segments, and the digit is selected by the output CT signal from the chip.
This is a dynamic display in which the required digit segment is selected by the 10,000 outputs that are output alternately in the order of each numerical CT and the 4-bit outputs that are output simultaneously from a to d, and the display units are alternately displayed in order. . Inputs from input switches crossing the outputs CT _1-1 , CT _1-2 , CT _2-1 , and CT _2-2 are similarly dynamically input. As will be described later, the present invention has a feature that it can be displayed even during process execution, and input can be made even before the process is completed. The scanning output signal for inputting key entries etc. is output sequentially by the clock for computer program processing, while the output for operating the control load is an output of the length required for the load to be turned off. There is also a driver circuit (not shown) which serves as an interface circuit and powers up a signal from the gate circuit to drive a solenoid, lamp, etc. An AC load or the like is driven by ANDing with the output from the oscillator and outputting it as a trigger signal for a triack or the like. In the matrix circuit section, a matrix is constructed in such a way that the scanning line and the input line of the microprocessor intersect, and the point at which this intersection becomes a switch corresponds to the input command section. If there are x scanning lines and y input lines to the processor, a maximum of x·y switches is possible. In the ROM included in the computer chip element, the master program for executing the sequence of the copying machine is ordered in advance and is embedded in each address, and its contents can be retrieved each time a specific address is set. A read-only memory that stores programs (key entry programs, device operation programs, machine termination programs, etc.) in binary code in order from address 0 to the required final address, which is preset in a well-known matrix circuit with a code. . RAM is a read/write memory that stores the number of copies and temporary control signals during process control, and is a well-known memory that stores one set of binary codes, and is composed of multiple sets of flip-flops. However, an arbitrary set is selected by the address designation signal, and data is written to or read from a plurality of flip-flops within the set. [About control timing and control load] Figure 3 shows the case of half size such as A4, B5, U2, etc., and Figure 4 shows the case of full size such as A3, B4, U1. Shows control timing chart and control load. U ₁ and U ₂ are universal cassettes, and U ₁ stores paper of any size corresponding to the full size of U ₁ . The SW is a switch that turns on the power to the device and lights up the power-on indicator lamp at the same time. M1 is a motor for rotating the fixing roller, _L1 is a wait lamp that indicates copying is possible, _H1 and _H2 are fixing heaters built into the fixing roller, and cooling blower _M2 is a motor that cools the above heater, the main The motor rotates the photosensitive drum, and the paper feed roller PL is a constantly rotating paper feed roller 24.
The first register PL is a plunger for driving the first roller 25, the second register PL is a plunger for driving the timing roller 29, and the developing device PL is a plunger for driving the screw that stirs the developer powder. , ATR detection is an optical detector and hopper to detect a decrease in toner density.
HOP is a toner replenisher operated by the detector, pre-exposure tape _L2 is a lamp that uniformly irradiates the photoreceptor in advance, optical motor _M4 -F is a forward motor that moves the optical system for exposing the document, and optical motor
M ₄ -B is a motor for reciprocating the optical system,
Exposure lamp L ₃ is a lamp that illuminates the photoreceptor with the original image, blank exposure lamp L ₄ is a lamp that uniformly exposes the photoreceptor when the original is not exposed, and L ₅ is a lamp that uniformly exposes the photoreceptor during the entire surface exposure process. lamp, 1
The secondary transformer Tr ₁ is a primary charging transformer, and the bias transformer Tr ₂ is a transfer charging transformer. Details of these operation timings will be described later. In these control loads, the main motor, the cooling motor, the operation control signal A of the AC charger transformer Tr ₃ for static elimination, the operation control signal B of the paper feed roller plunger PL in the upper stage of the cassette, and the optical system advance motor M ₄
-F, exposure lamp L ₃ , developer plunger PL control signal E, optical system reverse motor M ₄ -B control signal F, exposure lamp L ₂ control signal G, jam indicator lamp, reset plunger control signal I , A.C.
Control signal J for transformer voltage switching, primary transformer
Tr ₁ , a control signal K for the bias transformer Tr ₂ , and a control signal L for the blank exposure lamp L ₄ are directly output from the CPU. Also, a control signal C for the first register plunger, a control signal D for the second register plunger,
The control signal H for the full-surface exposure lamp is formed by a logical combination of the above-mentioned signals. That is, C=A・, D=
(・)・A, H=E+L. Other output signals from the CPU include the upper cassette instruction signal.
There are UL and total counter control signals TC.
(RG is a signal indicating the second registration position generated by a micro switch installed in the optical system running path) On the other hand, the signal input to the 1-chip micro computer is the home position signal of the photosensitive drum.
DHP (generated by drum cam and micro switch) optical home position signal
OHP (generated by the micro switch at the end of the optical system scanning path), paper feed signal PF (drum
There is a pulse signal CP by a generator 36 (generated by a cam and micro-switch) and operatively coupled to drum rotation designed to generate one pulse per degree of rotation of the drum. The generator could be an oscillator that generates a series of clock signals synchronously with the drum. Time-sharing display selection signals CT _1-1 , CT _1-2 , CT _2-1 , CT _2-2 for operating the display 25 (number of sets) and display 26 (number of counts) in FIG. is output. A corresponding 4-bit binary number is output from output terminals a, b, c, and d to operate the seven segments of the selected display. Also, numerical values,
Signals from key groups 21, 22, 23 for various commands,
The Coincidence signal that is output when the upper and lower cassette sizes match and the SIZE signal that indicates whether the selected cassette size is FULLSIZE or HALF SIZE are the time-sharing display selection signals mentioned above.
CT _1-1 , CT _1-2 , CT _2-1 , CT _2-2 , and E time-divisionally input 4 bits in parallel from PI1 to PI4 to the CPU. Furthermore, this message is output when no cassette is inserted for the upper or lower selection, when there is no paper in the selected cassette, and when the "STOP" key on the operation panel is pressed during copying. STOP
The signal and the copied paper are sent to detector 2 (first
The CPOS signal that is output when ejection is detected (when the copy tray is reached) is input to a 1-chip microcomputer. [Description of a 1-chip microcomputer and its peripheral circuits] Figure 7 shows a 1-chip microcomputer PPS4/- made by Rockwell Corporation used in the present invention.
Please refer to the PPS4/1 manual for details regarding the circuit diagram of 1. FIG. 6 shows a circuit diagram of the present invention. In FIG. 6, the relationship between the signal names of the one-chip microcomputer PPS4/1 and the control signals of the present invention is shown. DI/O is CT1-1, DI/1 is CT1-
2. DI/2 is CT2-1, DI/3 is CT2-
2. DI/4 is B, DI/5 is E, DI/6 is F, DI/7 is G, DI/8 is I, DI/9 is
TC, SERIALOUT is UL, RI/5 is A, RI/
6 is J, RI/7 is K, RI/8 is L, RI/
is a, RI/ is b, RI/ is c, RI/ is d, INTO is CPS, INTI is STOP, PI1 is key “0”, “4”, “8”, “MULTI”, “Cassette up/down switch ” with each end connected in common, PI2 has keys “1”, “5”, “9”,
PI3 has keys “2”, “6”, and “SINGLE” and “AUTO” switches connected together.
“INTERUPT”, “CLEAR”, “COINCIDENCE”
PI4 has keys "3", "7",
“RECALL”, “jam reset switch”, “jam kill switch”, “SIZE” transistor collectors are connected at one end, PI5 is PF, PI6
Connect to OHP, PI7 to DHP, PI8 to CP, etc. The “ORIGINAL” LAMP of the operation section in Figure 2 is
Input J to INVERTER1, create an OR signal,
It will be lit. C is INVERTER602, AND
Input B and A to GATE603 and create by logical combination of C=A-. D is AND GATE604,
Input the registration signal, E and A to NAND GATE605 and INVERTER606, D=(RG・E)・
Created by logical combination A. H is OR GATE60
Input L and E into 7, and make a logical combination of H=L+E. The four display devices used in the displays 5 and 6 are divided into seven segments, each segment has four wires connected in common, and the seven signals connected in pairs are sent to the decoder and driver 8. , a, b, c, d of a 1-chip microcomputer
The 4-bit signal is decoded and output. On the other hand, the selection of these four display devices is CT1-1,
Setting and resetting are repeated in the order of CT1-2, CT2-1, and CT2-2, and the lights are lit in a time-division manner. The 16 input signals connected to the contacts of the matrix of PI1 to 4 and CT1-1 to CT2-2 are
Input in time division. Keys “0”, “1”, “2”,
“3” is when only CT1-1 is set, and keys “4”, “5”, “6”, and “7” are CT1-2
When only is set, keys “8”, “9”,
“INTERUPT” and “RECALL” are set when only CT2-1 is set.
“CLEAR”, the “jam reset switch” which turns on when a jam occurs, is the “cassette up/down changeover switch”, “AUTO”, “COINCIDENCE”, “SIZE” when only the CT2-2 is set Read when only ON signal E is set. A diode 19 is provided to prevent backflow. Peripheral circuits are shown in FIGS. 6-2 to 6-4. MS13, 19, and 21 are used to determine the cassette size of the upper cassette, and MS15 is used to confirm insertion. They output 0, 1 signals and have weights of 1, 2, 4, and 8, respectively. MS1
2, 20, and 22 are for determining the size of the lower cassette, and MS16 is for confirming its insertion. They are given weights of 1, 2, 4, and 8. Then, these are input to the MULTIPLEXER 609, and the switching between the upper stage and the lower stage is performed by outputting codes 1, 2, 4, and 8 to the outside by a switching signal UL from a 1-chip microcomputer. Then, the decoder 11 decodes these 1, 2, 4, and 8.
When it is A3, only MS15 is turned on, the decoded result is 0, and A3 is sent via driver 612.
Turn on the lamp. Similarly, A4 is 1, U1 is 2, U2 is 3, B4 is 4, B5 is 5, and when no cassette is inserted, it is 8. Also, if the cassette is not inserted deep enough, use MS15 or 16.
Since is not ON, the weight of 8 will always be 1.
The decoded result will be a value between 9 and 15, and none of the lamps will light up. (Refer to Figure 6-5) The “SIZE” signal has a weight of 0 in the decoder 611,
This signal which inputs 2 and 4 to the OR GATE 613 and outputs "1" when either one is selected, that is, when the size is selected, is an input signal that changes the sequence timing depending on the size. Also, MS13, 19, 221 and MS12, 20,
The 2nd set of 22 is MAGNITUDE COMPARATOR
610, and when both weights match, the "COINCIDENCE" signal is set to 1, and it is determined whether the sizes of the upper and lower cassettes match. When the upper cassette is commanded (the upper/lower switch is turned on), the cassette selection signal UL output from the 1-chip microcomputer becomes 0. Therefore, the transistor 621 is turned off and the upper cassette paper detection circuit is selected, and the transistor 622 is turned on via the INVERTER 23, so the lower cassette paper detection circuit is not selected. However, in the selected upper cassette paper detection circuit, when the paper runs out, the resistance of CdS615 decreases.
Since the NEGATIVE input terminal 6 of the operational amplifier 13 becomes lower than the terminal 5, the output of the OPAMP 613 becomes "1" and becomes a STOP signal. Similarly, when UL=1, the lower cassette paper detection circuit is selected and functions in the same way. Also, if the “STOP” key on the operation unit is pressed while the main motor is running, FLIP-FLOP61
7 is set because A=1, and KSTOP=1. Therefore, when the main motor is not driving, A
Since A = 0, it is not set, and the FLIP-FLOP 617, which is set while the main motor is driving, becomes A = 0 and is reset when the main motor stops. this
The outputs KSTOP, upper cassette paper detection signal, lower cassette paper detection signal, and no cassette signal of the FLIP-FIOP 617 are input to an OR gate 618, and when any of these signals is "1", it outputs "1" as "STOP". [Explanation of the flowchart of the sequence program stored in the ROM] When controlling the sequence with a 1-chip microcomputer, each bit in the RAM is set and reset in order to temporarily store various operating modes. However, these are called Flags, and there are about 20 types. Flag1: Set when the SINGLE key is pressed,
Reset when MULTI key is pressed. Flag2: As a result of determining the paper size, FULL SIZE
Set when , and reset when HALF SIZE. Flag 3: Set when SET COUNT and COPY COUNT match. Flag 4: Set when a delay jam occurs. Flag 5: Set at the rising edge of the second paper feed signal when entering the second copy cycle from the first copy cycle during MULTI-COPY. Flag 6: Set at the start of the optical system of the second cycle during MULTI-COPY. Flag7: MULTI or
Set when the SINGLE key is pressed. Flag 8: Set when a retention jam occurs. (When paper is stopped on the detector, etc.) Flag 9: Set when the drum is not at HP (stop position) when the power is turned on, and reset when it reaches HP and enters the rotation cycle afterward. It is also set when the "SINGLE" key is pressed during the post-rotation cycle, and reset when the "MULTI" key is pressed. Flag10: Set when the number of input pulses does not reach the set value, and reset when it does. Flag 11: When entering post-rotation in the HALF SIZE copy cycle, the optical system was set to HP while the drum was rotating 150 degrees from the inverted position of the optical system, and the position was 150 degrees from the previous position. Reset the time. Flag13: Set when CT1-1 is set,
Reset when resetting. Flag14: Set when CT1-2 is set,
Reset when resetting. Flag15: Set when CT2-1 is set,
Reset when resetting. Flag16: Set when CT2-2 is set,
Reset when resetting. Flag17: Reset when it is in the upper row, set when it is in the lower row. For example, if the "upper cassette" is specified with "AUTO" and paper runs out, if the lower cassette has the same size and paper, flag 17 is set and paper is fed from the lower cassette. Flag 18: Set when the “INTERRUPT” key is pressed, and reset when the “RECALL” key is pressed. Flag 19: Set when the “Jam Kill Switch” is pressed. This allows the jam program to be ignored even if no paper is sent during COPY. The operation mode is determined by determining whether each of the above flags is set or not, and program execution, sequence operation, jam processing, etc. are proceeded. This is done by changing part of the program by shorting or opening the parts related to the terminals for inputting signals to the computer, thereby eliminating unnecessary processing operations during testing. 5-1 to 5-7 are system flowcharts of sequence programs stored in the ROM of a 1-chip microcomputer that satisfy the timing charts of Figures 3 and 4 and the specifications of the operating section.
As shown in the figure. This system flowchart will be explained according to each step. In steps 1, 2, and 3, set or reset the UL according to the instructions of the upper and lower selection buttons in order to select the transfer paper size lamp on the operation unit and detect the presence or absence of cassette paper. SUBP 4 is a display digit signal switching subroutine whose details are described in steps 261 to 284.
This SUBP is always passed through the flow while counting pulses CP for sequence control or when the program has a change in another input signal. As a result, the display can be dynamically switched and used at approximately 1/4 duty (usage rate), and therefore the display can appear to display continuously without flickering. When the power is turned on, if the optical system is not at the home position HP, repeat 4-5-6 to move the optical system backwards.
When OHP is reached, press 7 to stop reversing. next,
If the drum is not at the home position, repeat steps 8-9-10 to search for DHP, and when DHP is detected, step 11-12.
-52 Perform steps 53 to 62. As a result, image exposure and image formation can always be performed from an accurate position, and the reliability of image quality can be increased. This is provided to prevent chattering of the detection signal caused by the microswitch which rotates one more time after detecting the DHP at 55-56 and detects the next DHP at 58-59. The relationship between this timing and the flowchart is explained in Section 8.
It is shown in the figure. When the optical system or drum is not in HP, the display only shows "00" and "00". When the optical system reaches HP and the drum rotates more than once, HP
It is not until this point is reached that input using the numeric keypad (FIG. 2) becomes possible. If both OHP and DHP are detected when the power is turned on, the process passes through 4-5-7-8-9-11 and immediately enters the key reading routine of 13-14-15-16. Figure 3 shows the timing chart for two half-size copies, so now use the numeric keypad to enter 2 in display 25 (number of copies set) in Figure 2, and press the "MULTi" key. We will explain the flow in this case. It passes through Tenquirtine 13-14-15-18 and enters the sequence routine 19 and below. 19 indicates point A in FIG. 20 and 21 indicate the section A in Figure 3,
Indicates that input clock pulses are counted up to 60. Also, in this section, the digit signals of the display are switched sequentially through SUBP, which apparently indicates that the display is lit in parallel with the sequence control. 22 indicates that J (transformer switching) is turned on when CP is counted 60 times. Thereby
Increase AC corona discharge voltage. Reference numerals 23 and 24 refer to section d in FIG. 3, which is a routine that waits for the paper feed signal to be input to PF. When reaching point O in Figure 3-2, before this
When the STOP mode is entered, the timing diagram shown in Figure 3-2 will appear. Therefore, in step 25 in FIG. 5-1, this is determined and the process jumps to 51 and subsequent steps of J and K off. 51 is O, 52-56
57 to 59 indicate the section K, 60 indicates the time point K, 61 indicates the section K, and 62 indicates the time point K. Therefore, an emergency stop immediately after the start is possible without wasting paper, and the delayed turning off of the lamp prevents uneven charge removal on the drum.
If the STOP mode is not reached until point O, the process proceeds to paper feed B 26 and thereafter. 26 indicates O, and indicates the section from 27 to 30 S, and waits for detection of DHP omission due to drum rotation. 31 to 36 indicate the interval of 3 and wait for the PF to pass. Also, the clock signal CP
The PF is read in synchronization with the PF, and the CP is counted to 34 at the same time as determining when the PF is coming out. 37 refers to the point in time. Reliability can be increased because the next step is executed only after determining whether the DHP or PF is missing. Also, at this time, the retention jams after the second COPY cycle indicated by 38 to 45 are
I'm going to check, but this time it's the first one, so it's 38.
It is determined that Flag6 is not set, and the process jumps to 46 onwards. 46 to 49 indicate the section of
This is an interval in which counting is started from point 31 (the number of pulses is set to 67) and waits for the CP to reach the set value of 67. The time point reached is 50, that is, the time point T in FIG. At this point, turn on the developer plunger, optical system advance motor, and exposure lamp.
At the same time, the pre-exposure lamp G is turned on, but the G
In the case of half size, it turns on only during the first copy cycle and does not turn on after the second copy, so at this point it is necessary to determine whether it is half or full (65) and 1.
Since it is necessary to determine whether it is the copy cycle for the 1st copy (63), this is shown in 63-66. Since it is now the third card of the half, I jump to 63-66 and turn the G on. 87 counts again from the time of ta
Start CP counting. In the middle of this process, the routine that waits for the OHP to turn off is 67 to 70, which refers to the section N in Figure 3. The time point when the OHP is turned off is 71, which is shown in Fig. 3 (c). Therefore, the accuracy of the sequence is increased because the next step is only proceeded to after determining whether the OHP is missing. Also, at this point, a delay jam check is performed in the case of a half "MULTi" copy. After entering the second and subsequent copy cycles, a jam check is performed for the paper from the previous copy cycle.
It is ignored by Flag6 and jumps from 72-73 to 81. This half delay jam check is 72~
It is indicated by 80. Furthermore, since the blank lamp is kept on until the point C, it is possible to eliminate potential unevenness in the unexposed area when the exposure lamp rises. 87 in 81-82
The section H in Fig. 3 is the section in which the count is waited for. Furthermore, counting 105 from here is 8.
4 to 85 indicates the section F. The time points when the count reaches 105 are shown as 86 to 101 and 112, which are the half size inversion positions in FIG. At this point, as shown at 86 to 91, it is determined whether or not there is no more paper in the designated cassette. (86) To determine whether to switch to another cassette when the paper runs out, determine whether the cassette is set to AUTO (87), and switch to another cassette.
It must be determined whether the sizes are the same (88). And if the above conditions are satisfied,
After passing through steps 85 to 89, the UL is switched at 90 or 91, and the process proceeds to steps 92 and thereafter. In addition, the STOP determination of 86 includes not only the case where the paper runs out, but also the case where the STOP key is pressed or the cassette is removed, so in these cases, the UL is switched once, but the
Since STOP is determined again at 01, there is no problem because it will proceed to the post-rotation after 112 and return to the original state when it returns to 13 of the key reading routine. Furthermore, since this point E is the half-size optical system inversion position, it is determined whether it is half or full at 92, and if it is full, it passes through 93 and returns to 190 in Figure 5-4.
Proceed to the subsequent steps, but since this is a half case, proceed to 94 and subsequent steps. . Then, from 96 to 102, the copy count (CT ₂ + 1) is completed and compared with the set number CT _1. If the two match, and the STOP mode is entered, the copy count (CT 2 + 1) is completed before the point E in Fig. 3. If a jam occurs, the process proceeds to the post-rotation routine from 112 onwards. If the above is not the case, go to the routines 103-111. This routine is executed when the STOP mode is entered within the time when the paper feed PF signal is input from the reversal position of E (as shown by timing 3 in Figure 3).
At the point when the transformer switch J is turned off (106), wait until the count reaches 150, and jump to the post-rotation routine from 134 onwards. The flow of time 103-
104-105-106-107-109-10
It becomes 3-104-134. If the STOP mode does not occur, 103-104-105-107 until PF turns on (section T in Figure 3).
-109-103......Repeat, and when PF turns ON, 103-104-105-108
Flag 5 is cut and the process returns to the point where the paper feed roller control signal B of 26 is turned ON again (indicating that the second or subsequent copy cycle has started). This refers to the time point 1 in FIG. 3, but from this point onwards, the same control contents as in the above-mentioned steps 1 to 2 in FIG. 3 are basically repeated. However, since the optical system reverse (F) stop and delay jam check are included in the second and subsequent copy cycles, only these will be explained additionally. 2nd time 32-36, DHP is OFF then PF is OFF
The time it takes to reach the OHP is shown (section G in Figure 3), but if the optical system reaches OHP within this time, it will be 35-3.
6 and turn F off. Since the backward movement of the optical system and the rotation of the drum motor are asynchronous, the optical system
There are variations in the time it takes to reach OHP. Therefore, the section 27-30 of S and the section 46-49 of D in Fig. 3
Routines 29 to 30 and 48 to 49 are provided for detecting OHP and turning off F, respectively. The delay check on the first sheet is on the second sheet.
During the copy cycle, the optical system moves forward (Eon).
This is done by detecting the arrival of paper to the detector 2 when the OHP is turned OFF, so this refers to the point in time in Fig. 3. This is checked in the routines 72-80 of Figure 5-2. If paper is not detected after a delay, 72-
73-74-75-76-77-78-79-8
0, set Flag4, delay jam and remember what has been done, and set the copy count number CT ₂ to 1.
Subtract the number and turn on the jam solenoid.
If the jam killer switch is turned on and its instructions are read in Key output routine 13, steps 77 to 80 will be ignored. The activated signal is turned off at point 83 (time point M in Figure 3-2).Therefore, the machine can be test run without paper feeding. Also, although Fig. 3 only shows the timing diagram for the case of copying two sheets, if this is a copying of three or more sheets, the retention jam check of the first sheet (paper stop check of the detector operator) is required. ) is performed when the PF turns OFF in the third copy cycle. This is noted in 38-45. If the first
38-39-40 if copy jammed
-42-43-45 and enters the post-rotation routine after 135. At this time, Flag8 is set to remember that a retention jam has occurred, and in addition, since the copy cycle for the third copy has already started when the copy is half, _-2 is subtracted from the copy count CT2. However, if it does not stay, the process advances to 38-39-41, outputs an addition signal TC of a total counter (not shown), and increments the counter by 1. This TC is turned off at 50. Next, in Figure 3-2, the delay jam and
Let us assume that the check has been completed and the second copy cycle has reached the optical system inversion position. At this point, the number of sheets set in 99 and the number of sheets counted match, so Flag 3 is set at 102, the fact that the mode ends with a match is memorized, and the post-rotation routine from 112 onwards is entered. 113 to 133 indicate the section Mo in Figure 3, where 150 counts of cp are counted,
In parallel with this, the optical system reaches OHP within that time, and when it reaches it, turn F OFF115-11
At the same time as 6, check the retention jam of the first sheet of paper (SUBI of 117 to 126), and flag
Set 11. Once this is set, the retention jam check routines 118-125 are ignored in step 117 even if the optical system is in OHP mode. This point refers to the point y in FIG. Therefore, the retention jam check during post-rotation is performed only when the optical system reaches OHP. if,
If no delay jams have occurred before this point,
If the first sheet of paper causes jamming without instructions to kill the jam, call 117-1.
18-119-120-121-123-124
-125-126, set Flag8,
It remembers that there is a retention jam, subtracts -2 from the number of copies since it is half size, and sets the jam solenoid I.
Turn on. (Figure 3), then Flag11
Since it is set, it jumps to 117-127. However, if there is no retention when the optical system reaches OHP, 117-118-119-12
It progresses as 0-122-126 and turns on the total counter signal TC. On the other hand, the start key input routine SUBH from 127 to 133 must be passed within the time to count this CP to 150, but this is because the set number and the number of copies match, and the process goes to the post-rotation routine or the SINGLE mode. Only when entering the post-rotation routine with
- Since the MULTI or SINGLE key is accepted from the point in Figure 2, this is the routine to read these keys. That is, for example, if the MULTI key is pressed, it will pass through 127-128-129-130-133, and if the SINGLE key is pressed, it will pass through 127-1.
Pass through 28-129-131-132-133.
Therefore, when using the MULTI key, set Flag9 to 0, Flag
7 to 1, when pressing the SINGLE key, set Flag9 to 1,
Set Flag7 to 1. Flag9 is MULTI or SINGLE
For this purpose, Flag 7 is used to remember that a restart command was input during the backward rotation. When the CP count reaches 150, it is 134, indicating the time point U in Figure 3. 135, 136, 137 have OHP optical system
This is provided for safety as the point at which this point is reached varies. 138-140 indicates the section Y in Fig. 3-3, which is the section in which the CP counts 38 counts from the point Y. The point at which the count reaches 38 is point A in Figure 3-3. Here, along with turning on the retention check at point y or turning TC off (141), the delay jam check for the last copy paper is executed. It's also the time to do it. The flow at this point is 142
-149, and a jam check is performed if no jam or delay jam has occurred before this point and if there is no command to kill the jam. If jammed, turn on I, set Flag4, and subtract -1 from copy count. However, SINGLE
mode, this subtraction is ignored. 147.
150 to 152 indicate the section li in Figure 3-3,
Count 60 CP. The time when this value is reached is 153, and the jam check is turned on.
Turn off the I. In Fig. 3-3, it indicates the point in time. 154 to 156 indicate the waiting time for reaching the OHP, which corresponds to the section ``R'' in Fig. 3. And the third-
In Figure 3, MULTI in the section from Melo to Melo,
140,15 to accept SINGLE key
SUBH is provided at 2,156. and
When the OHP is reached (FIG. 3 B), the motor on signal A is turned OFF at step 157. 158 indicates the section of wa, and 159 indicates the time point of . If a delay or stuck jam occurs before this, 160-
The jam release routine from 161 to 182 is entered. If not, and Jiyam Killing Order 1
If there is no 62, please check the retention jam of the last copy paper.
Perform a check. If the retention check is OK, turn on and turn off the TC at 164, 165, and 166.
However, if the set number and copy number match and the end mode is entered, clear the copy number with 167-168. Furthermore, if the MULTI or SINGLE key is not pressed during post-rotation, use 169-175. As usual, return to the key reading routine in step 13. 169-1 if pressed and MULTI key
The program passes through steps 70-171, and determines whether the set number is 0 at 173. If it is 0, it passes through 175 and enters the key reading routine at step 13, and the MULTI key being rotated afterward is ignored. If it is not 0, it passes through 173-174 and jumps to 19 to start the copy cycle again. on the other hand
171-17 if the SINGLE key was pressed
Pass through 0-172-174 and jump to 19 again
Enter copy cycle in SINGLE mode. In the above-mentioned retention check, if the retention occurs, turn I ON and OFF.
and subtract 1 from the number of copies. 163-176-1
77-178-179-180-181). however
If it comes in SiNGLE mode, -1 is not subtracted. 182-189 is the jam release routine of I.
Jam mechanism latched at ON and OFF (No. 9-2
The routines 182 to 184 wait for the jam switch that is turned on to be released (reset button turned on) by the button shown in the figure. been canceled
When it becomes OFF, proceed to 185 and after, and here the MULTI or
For SiNGLE, MULTI for MULTI,
SiNGLE is waiting for SiNGLE to be pressed. Therefore, if MULTI was previously pressed,
It passes through 185-186-187-188 and jumps to 19 to copy the remaining number of copies. For SiNGLE, it passes through 185-186-187-189 and also jumps to 19. Therefore, other combinations are not accepted. Next, the flows shown in FIGS. 5-4 and 5-5 will be explained with reference to the full-size timing chart shown in FIG. 4. 4-2 go through the same flow as the flow up to that point in FIG. 3, so the explanation will be omitted. Therefore, this point E is the half-size optical system inversion position, but this time it is full-size, so from this point forward it is different from half-size. Therefore, this E refers to flows 86 to 92, but when the size is determined in 92, it passes through 93 and jumps to 190 and beyond. 190-191 is a routine for waiting for the optical system to move forward further from the half-size optical system inversion position and count CP by 150, and refers to the section in FIG. 4-2. And FULL when it reaches 150 counts
The SIZE optical system is inverted (at the point in Figure 4). In the flow, it refers to 192 to 198. In this way, since the reversal position of the optical system is selected based on the count number for each size not from the start point of the copy cycle but from a subsequent predetermined position or timing, a highly accurate reversal position can be obtained. 1 because it is a reversed position
At 92, turn off E and G and turn on F and L. Furthermore
In MULTI mode 193, if jam has not been issued before this point 194,195, add 1 to the copy count at 196, and it is SET COUNT
If the number matches, 197 proceeds to 232 via 199-231. If they do not match and the STOP mode is selected, the process jumps to 232 via 231. Therefore, only if they do not match and the mode is not STOP mode, the process proceeds to 200 and thereafter. Therefore, at this point,
There are two routes: those that proceed to 200 and above, and those that proceed to 231 and beyond. First, the flow after 231 will be explained. Cases that fall into this flow are:
193 when in SINGLE mode, 194, 195 when jam occurred before, set count and copy
197,199 when count matches, 197,19 when it does not match and is in STP mode
8, and it can be considered that the time point in FIG. 4 has apparently moved to the time point in FIG. Therefore, since it is now the copy count of the first copy, it can be assumed that the sequence moves to → only when the STOP mode is entered and the sequence is executed. Since this is the routine for the first of two copies, we will explain the case where the copy count is incremented by 1 and the process advances to 200 or later. 200-201 refers to the section shown in FIG. 4-2, and the time point when 38 cp counts is indicated by 200-201 in FIG. At this point, a copy paper delay jam check is performed, and the check flow is shown at 202-208. This jam check is effective when there is no jam kill command 203, and if the copy paper is delayed, flag 4 is activated.
set, turn on jam solenoid I, copy count
Subtract -1 from and turn J OFF. This timing diagram is shown at 2 in FIG. Also, this copy
Subtraction of count 206 is ignored in sin GLE mode. Next, the cp shown by 209,210 is
The time for counting 112 counts is shown in the section of Fig. 4. The point at which 112 counts were reached is shown in Figure 4. At this point, a determination 212 is made as to whether a delay jam has occurred at the same time that I, which was turned on at the time, is turned off. If a jam occurs, as a result of the determination in 212, the process proceeds to 213 and subsequent steps to satisfy the timing 2 in FIG. 4. At first, turn off K 214,
Wait for the optical system to reach OHP at 214 and 215. This section refers to the section shown in Figure 4. OHP
The point when F is reached is indicated by the mark in Figure 4, and F is turned off
Then, search for the next DHP at 216, 217, and 218 (the blank section in Figure 4), and when the DHP is reached, 2
Wait for DHP to turn off at 20,221 (4th
(section shown in the figure). When the DHP turns off, jump to 154 and beyond, wait for the DHP to come again (section 4 in Figure 4), and finish the copy operation. If, in the determination 212 of JIAM at the time,
If OK, wait at 223 and 224 for the OHP to arrive (area of Figure 4), and when it comes, press F at 225.
Turn it OFF (as shown in Figure 4) and wait for the PF signal to arrive at 226 and 227 (area of Figure 4). P.F.
The point at which the
228 in the flow to satisfy the timing of
Determine STOP and proceed to 222 and subsequent steps. JK at 229
Turn OFF, wait for PF to turn OFF between 257 and 260, then search for DHP that comes after one rotation, and stop the copy cycle. If it is not STOP mode, set Flags 5 and 6 at 230, and
Jump to 26 to enter the copy cycle for the second copy.
Therefore, the chi-mi of FIG. 4-3 flows through the same flow as the chi-mi of FIG. 3. However, since the retention jam check for the first sheet of copy paper is performed at point 4 of the copy cycle for the second and subsequent sheets, the check flow is shown in 38-45. If it stays 38-39-40-42-43-
44, jumps to 217 and satisfies the timing 4 in Figure 4. First of all, as soon as you stay, JK
Turn OFF, set Flag8, and reduce the number of copies by 1.
Subtract. After that, the process jumps to 217 and the drum is rotated until DHP is detected, and when it is detected, copying ends. In the copy cycle for the second full-size copy, the first to third copies execute the same flow as the half-size copies, and the time point at which both branches diverge is at the second copy cycle. flow 92
is the half reversal position. Therefore, the section of FIG. 4 is the time 190 to 192 explained above,
The point of time is the full size inversion position, and the number of copies matches the number of sets at 196, so 192-19
3-194-195-196-197-199-
231, turn J off (-next charging off)
Then, the process proceeds to the post-rotation routine starting at 232. 232 to 234 indicate the time for counting 38 cp, which corresponds to the section in FIG. At the point when the count reaches 38 (in Figure 4), the delay jam check for the last copy paper is performed, and the flow is 2.
35-241. Here, even if a jam has not occurred before, if a jam check is performed at 235 and there is no jam killing command 236, and a jam occurs, the jam solenoid I is turned on and the copy count is subtracted by -1. do. however
When in SiNGLE mode, copy count subtraction 240
Do not do this. 242 to 244 refer to the section in FIG. 4, which is the time during which 60 counts of cp are counted. When this count is reached, it turns ON at 241.
Turn OFF I (as shown in Figure 4). 246 more
52 counts of cp at ~248 (in Figure 4), 24
Turn off bias K at step 9 (as shown in Figure 4). Wait for the optical system to reach OHP at 250-252 (section 2 in Figure 4), and turn F off at 253 (section 2 in Figure 4). After that, 254-256
Wait for the paper feed cam pF to turn ON at (Figure 4), and then wait for it to turn OFF at 258-26.
Wait at 0. And when it goes OFF, the drum will go to the next one.
Wait until it rotates and reaches DHP (154-15
6. Terminate the copy cycle (a) in Figure 4. In addition, 234, 244, 248, 252, 25
6,260, the subroutine SUBH is placed in the loop within the time after the point in time.
It is provided so that the MULTI or SiNGLE key can be read. Also, the "INTERUPT" key has the same function as the "STOP" key, and it similarly shifts to the post-rotation mode. Moreover, at this time, the indicators 25 and 26
The set number and count number are transferred to a set of registers in the memory RAM, and a new value can be entered on the display. After this, execute the flow from the key entry above. When the copying is completed and you enter the post-rotation mode, press the “RECALL” key, and the original value stored in the above register in the RAM will be displayed on the display 25.
26 and press the "MULTI" key again to copy the remaining number of sheets. 2 Figure 9 shows devices related to jam safety. Figure 9-1 shows a door switch for safety when handling jammed paper, and is used to open and close the case cover and door. The figure shows a microswitch DS that turns the power on and off accordingly. Figure 9-2 shows the fixing device and the jam solenoid.
A mechanism for turning off DC high voltage power is illustrated. When a jam occurs, the solenoid SL is activated and pulls up the lever 92 with the dowel 91 attached, causing the release lever 93 fixed by the dowel to lose its fixed point and rotate by the spring 96, releasing the micro switch 9.
Turn off 4. Therefore, the above processing mechanism stops. This can be canceled by pressing the reset switch 95. However, the main motor rotates the drum to the drum home position where the paper will be ejected. Table 1 shows an example of a program code list of command words and the like for executing the programs shown in FIGS. 5-1 to 5-7 in accordance with the manual for PPS-4/I.

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【table】 [Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a copying apparatus to which the present invention is applicable, FIG. 2 is a plan view of an operating section in the apparatus shown in FIG. 1, and FIGS. Operation time chart by size No. 4-
Figures 1 to 4-3 are operation time charts in full size, Figures 5-1 to 5-7 are control flowcharts of the device in Figure 1, and Figures 6-1 to 5-7 are control flowcharts of the device in Figure 1.
Fig. 6-5 is an example of the control circuit according to the present invention, Fig. 7 is the internal circuit of the computer used in Fig. 6, Fig. 8 is a control time chart when the power is turned on, and Fig. 9-
1 and 9-2 are cross-sectional views of the safety device and jam release device in the device shown in FIG.
In Figure 1, CPU is a computer chip element, G is an output gate circuit, M is an input matrix circuit,
25, 26 are indicators, P11-4 are input terminals, G
is a scanning output terminal, and D1 is a load output terminal.

Claims (1)

[Claims] 1. In a transfer type electrophotographic apparatus, after the start of feeding,
The next transfer material can be fed into the transfer material path that is discharged after passing through the transfer process and the fixing process before the previous transfer material is discharged, and the length of the path is longer than the large size transfer material, and an input means for setting a desired number of times of image formation by changing the number of transfer materials present in the image forming apparatus according to the size; a means for repeating the image forming operation by the number of times set by the input means; A memory for counting and storing a number related to the number of formations, a means for detecting trouble during the image forming operation at the position of the scanning optical system and at a time related to the image forming operation, and a means for ejecting the transfer material when trouble is detected by the above detection means. means for interrupting the conveyance before the trouble is detected, and means for correcting the number stored in the memory by calculating the number of 0, 1, 1 or 2 according to conditions such as the trouble detection time or size, after the trouble is detected. An image forming apparatus having: