JPS60136762A - Image processor - Google Patents

Abstract

PURPOSE:To perform jam processing, etc., corresponding to image size through simple constitution by counting a clock for controlling an image processing means and generating a timer signal for controlling the image processing means. CONSTITUTION:A microcomputer is supplied with a paper size detection signal from a microswitch which is operated according to a cassette 6 to perform programmed process control corresponding to form size. If the size is small, e.g. B5, the clock for controlling an image control means from an oscillator is counted by the microcomputer up to a prescribed value after a platen 2 reaches its home position; and the microcomputer with counting up to the prescribed value deecides on a jam unless a form reaches a paper detector 180 and a Hall element 129. When the form size is B4, etc., it is decided that a jam occurs unless the form reaches the elemen 129 when the platen reaches an inversion position corresponding to the size. Further, the counted value of the clock is varied according to the frequency of image formation and jam processing corresponding to the image size is perfoemd through the simple constitution.

Description

[Detailed description of the invention] The present invention relates to an image processing device.

Reprint of the specification (no change in content) To explain an example of the copying process of a copying machine to which the present invention is applied, the surface of a photosensitive drum, which has a photosensitive member consisting of a conductive layer, a photoconductive layer, and an insulating layer, first changes as the drum rotates. The primary charger uniformly pre-charges (for example, positive charge), and then as the document table (or optical system) moves, an optical image is scanned and projected, and at the same time, the re-charger charges the plate with alternating current (or a polarity opposite to that of the pre-charger). The static electricity is removed using direct current (DC), and an electrostatic latent image is formed depending on the brightness of the optical image. Furthermore, the above-mentioned image a is entirely exposed to light to form a high-contrast electrostatic latent image, which is then visualized by a developer mainly containing toner in a developing device. Thereafter, the visible image is easily transferred by a corona discharge having the same polarity as the toner (for example, negative if the previous charge is positive), and is then transferred to plain paper, where it is fixed on a transfer machine by a heater while being conveyed. . On the other hand, developer such as colored particles remaining on the surface of the photosensitive drum after transfer is removed by a cleaning blade, and residual charges are removed by a lamp and a corona discharger, making it possible to repeat the photosensitive drum. By repeating the copying process as described above, a desired number of copies can be obtained.

Conventionally, circuits have been constructed using transistors (referred to as TTL) to control process sequences such as those described below, but TTL has a small noise margin and is extremely susceptible to noise, and is particularly difficult to copy. This is especially noticeable in equipment that uses high pressure, such as machines. Therefore, as a noise prevention measure, many RC filters (filters made of resistors and capacitors) are used, and the number of parts increases, resulting in a complicated circuit configuration.

Furthermore, when configuring the control circuit, it was necessary to create complex logical expressions, which increased the design time.

Furthermore, depending on the size of the diskette, additional circuitry is required to reduce unnecessary operations of the process processing means and operate at appropriate timings.

Furthermore, control circuits constructed from so-called hard-wired logic circuits require a large number of elements due to their complex control circuit configurations, resulting in high costs and disadvantages in that sequence control cannot be easily changed.

In detecting paper jams (hereinafter referred to as JAM) caused by poor paper feeding, it is necessary to distinguish between copying one or multiple copies of different paper sizes, resulting in a complex circuit configuration and poor detection accuracy. It was also bad. In addition, in this type of control device, JAM detection malfunction is fatal, and a lot of time is required to design and study the prevention circuit as a countermeasure to prevent this.

Furthermore, when maintaining or assembling a copying machine, if you check the operation of the machine or perform heat running (test) without paper feeding, it is possible to kill the J A M detection circuit or the paper presence/absence detection circuit. , must, TT
In the control device for L, etc., each detection circuit is independent, so the operation thereof is complicated. Furthermore, when making various long and short time timer circuits that are absolutely necessary for controlling a copying machine, independent circuits are required on each side, making it particularly expensive to make a long time timer.

The present invention provides an image forming apparatus that eliminates the above-mentioned drawbacks, and the present invention also provides a copying apparatus using a liquid development transfer system that can always obtain good images. An object of the present invention is to provide an image forming apparatus that can efficiently use a photoreceptor and produce stable images. Another object of the present invention is to provide an image forming apparatus that appropriately determines a jam according to the size and number of images formed.The present invention also provides an image forming apparatus that prevents malfunctions of a control computer and performs stable control. Another object of the present invention is to provide an image forming apparatus that produces stable images regardless of the time the apparatus is left unused.

That is, an exposure operation means such as a document table or an optical system to form an electrostatic latent image on a rotating body such as a photosensitive drum or a belt, means for generating a plurality of reference signals such as the reversal position of the scanning means, and the like. It is characterized by having control means CP and U that input a reference signal and perform sequence control of the process processing load based on the contents of memories such as R and OM which store sequence steps for image formation.

Furthermore, in addition to the reference signal, clock pulses obtained by the rotation of the rotating body are input to the CPU to perform appropriate timing processing for pre-processing, process cycles, and post-processing.

Furthermore, a size signal is input to the CPU to perform timing processing and jam determination according to the size of the process cycle and post-processing.

Here, the scanning means may be one that scans the rotating body with a light beam to form a latent image, and the reference signal is obtained after constant scanning.

The photoreceptor may have two layers without an insulating layer, and a Carlson process may be applied to the image forming process.

Also, the clock pulse is, for example, 15.7 per rotation of the drum.
It is configured to generate 5 pulses. In this way, by counting 16 clock pulses, the drum can make one complete revolution or a slight overturn.

This means that in the pre-treatment or post-treatment process described below on the photoreceptor before and after the copying cycle, untreated areas can be eliminated and
Therefore, it is possible to enter the copying process from any part of the photoreceptor, which is an advantage of the endless drum.

(Pre-treatment) 1) Pre-exposure: The photosensitivity characteristics of the photoreceptor differ depending on its prior history of light irradiation, and therefore the sensitivity of the photoreceptor plate differs between the first copy and the second copy. Therefore, by uniformly exposing the photoreceptor to light prior to forming a latent image, the characteristics of the photoreceptor plate are made the same for the first sheet and subsequent copies due to the fatigue effect of the photoreceptor.

2) Furthermore, as will be described later, toner may adhere to the contact area between the cleaning blade and the photoreceptor after several lines have been copied, and in this case, it may be necessary to clean this prior to the copying cycle.

(Post-processing) Since the photoreceptor is charged at high voltage with various potentials, the surface potential and polarity of each part of the photoreceptor are different, and if left in this state, it will adversely affect the characteristics of the drum. It is desirable to eliminate static electricity on the surface using, for example, AC corona. Furthermore, if the drum is stopped at a fixed home position, such as the conventional right-end photoreceptor, the stopping position is always fixed, so the effects of corona charging will accumulate in the same area, and the drum cleaner will have to work very hard. Since the photoreceptor is pressed against the drum at a pressure of However, as in the present invention, by generating an appropriate lock pulse for each rotation of the drum, the stop position and even the start position of the drum gradually shift, thereby avoiding the cumulative effect of negative effects as described above, and also reducing the total length of the photoreceptor. It can be used evenly over many years and contributes to a longer life of the photoreceptor.

The operation of an exemplary copying machine of the present invention will be explained below with reference to FIGS. 1 and 2. First, when the main switch 1o is turned on, the digital control circuit is reset and other electrical systems start up, so it takes a short time (approximately 4 seconds here). After that, the photosensitive drum 15, which will be described later, is rotated in one direction. A clock pulse generation mechanism is provided in a part of the drive system to generate clock pulses about 16 times. Therefore, this photosensitive drum 15
When the starts rotating, first 16 clock pulses (hereinafter 1'
(written as 60 P etc), the drum rotates once or almost once. This can be thought of as a step before starting the copying process, and may be omitted because it is to make a high-quality copy when the copying process begins. Copy button 1 here
If 3 is set to O'N, the copying process will begin.

First, when the copy button 13 is turned on, the photosensitive drum 15 rotates by the amount of 16C'P plus 3CP, and then the original platen 2 with the original placed on the original platen glass 5 starts.
It is illuminated by an illumination lamp 16, and its image is reflected on the reflecting mirror 1.
7. The drum 1 is exposed at the exposure section 19 by the in-mirror lens 18.
The image is formed on 5.

The photosensitive drum is equipped with a seamless photosensitive member on the circumference of the drum to increase the efficiency of surface use. The surface of the photosensitive drum 15, that is, the photosensitive layer, is covered with a transparent insulating layer.
It is fully charged by the corona current from the Subsequently, when the exposure section 19 is reached, as mentioned earlier, the illumination lamp 1
The image of the subject irradiated on the photosensitive drum 15 is slit-exposed onto the photosensitive drum 15. At the same time, AC high voltage is being supplied from the high voltage power supply 20.

AC charging is performed by an AC charger 22. Then, a high-contrast electrostatic latent image is formed on the drum surface by the next full-face exposure using the full-face exposure lamp 23, and the next development process begins.

The developing device 24 includes a container 26 for storing a developing solution 25, a pump 27 for stirring the developing solution and pushing it up to the developing electrode section, a developing electrode 28, and a device for removing fog when there is a fog on the image developed on the drum. Therefore, the electrostatic latent image formed on the photosensitive drum 15, which is composed of an electrode roller 29 that rotates very close to the drum and one end of which is grounded, is pushed up onto the developing electrode 28 by the pump 27 and becomes a developing image. liquid 2
Developed with the toner in 5.

Next, the post charger 30 receives a high voltage charge from the high voltage power source 20 and apertures excess developer on the photosensitive drum 15 without disturbing the image. Next, the transfer paper 7 fed from the paper feed unit is brought into close contact with the photosensitive drum 15, and the transfer charger 31 charges the photosensitive drum 15 with an electric field from a high voltage of 2°.
The upper image is transferred onto transfer 7. Transfer paper 7 after transfer
is separated by a separation belt 32 and guided to a drying and fixing section 33. The remaining toner and developer on the photosensitive drum 15 is wiped off by the edge portion 35 of the blade cleaner 34 pressed against it, and the next cycle is repeated again. The developer wiped with the blade cleaner 34 flows into the grooves 3 provided at both ends of the photosensitive drum 15.
6 (FIG. 3), and is guided to the developing device 24 and used again for development.

Here, turn on the main switch 10 mentioned earlier and
To explain why the document table 2 only begins to move after the drum has rotated by the amount equivalent to CP, and the drum has rotated by 16 CP + 3 CP, this machine uses an endless type drum as the photosensitive drum. for that,
Any surface of the photosensitive drum can contribute to image formation. Therefore, if you want to increase the number of copies per hour by eliminating unnecessary rotations as much as possible, if some toner remains in the blade cleaner edge 35 for the first rotation of the drum, the machine will run for a week, for example. In the worst case, the photosensitive drum may dry out when not in use and become stuck to the drum, in which case it is necessary to clean the photosensitive drum before forming a latent image.

Next is the 3CP portion, which is because there is a 10-charging process before the slit exposure in the copying process mentioned earlier, and the cleaner engine part mentioned above is applied to the first copy. This process is based on the idea that avoiding this will result in a more reliable machine.

The transfer paper 7 is stored in a cassette 6, which is removably attached to a paper feed section at the lower left of the machine, and various types are prepared depending on the size of the transfer paper. When the document table reaches a predetermined position, an actuating piece 161 (FIG. 4) fixed to the document table activates the detection means on the main body side and outputs a signal, causing the constantly rotating paper feed roller 40 to operate. descends and comes into contact with the uppermost transfer paper in the cassette 6, and by the movement of the separating claw 39, one copy of the transfer paper is separated and sent out from the cassette 6.

However, the nearby register rollers 41 and 42 stop at the same time as the paper feed roller 40 descends, so the transfer paper 7 sent out from the cassette 6 has its leading edge aligned with the register roller 41.
．． 42, a slack is created between the guides 43 and 44. Then, when the paper feed roller is about to rise, the register rollers 41 and 42 rotate again in time with the leading edge of the image on the photosensitive drum, and the transfer paper 7 is fed at a speed that matches the circumferential speed of the photosensitive drum 15.

Next, the movement of the document table will be explained. Place the original to be copied on the original platen glass 5 with its leading edge aligned with the leading edge A of the glass, press it with the pusher cover 3 (Fig. 1), and press the copy button 13 (Fig. 1). starts rotating and at the same time starts operating. The document table 2 moves to the left in FIG. 1 in synchronization with the circumferential speed of the photosensitive drum 15 in response to a document table start signal after 9 CP from the clock pulse generating mechanism, and performs slit exposure. When the exposure is completed, the document table 2 stops moving to the left in response to a signal from the document table 2 itself in accordance with the paper size in the cassette, and immediately returns to the opposite direction, that is, to the right. The time required for this return is loss time during copying, so it is short
is desirable. For this machine, the return speed is approximately 4 out of 11 for the forward movement.
Double the speed and increase copying efficiency.

Because the return speed is fast like this, it is easy to cause a shock when stopping, but this machine uses a brake mechanism to absorb the shock.
The document table 2 is quickly stopped at a predetermined position. A counting device (not shown) linked to the copy button 13 makes it easy to make multiple copies of the same document in succession.

Restarting the document table during continuous copying is performed immediately after the document table 2 has stopped at a predetermined home position. The copy button remains on until the number of copies set in the number setter (FIG. 1) is fed. Further, the copying machine of this embodiment is capable of making copies of various sizes from the maximum B4 size to the minimum B5 size. In such a case, the document table 2 is set to B4, which is the maximum copy size, regardless of the copy size.
, the number of copies per unit time is small, resulting in a large time loss. Therefore, this copying machine supports each copy size, for example, A4. A plurality of document table reversal signal generating members 48A, B, and C (corresponding to B5) are provided (FIG. 4), and the copying cycle is changed in accordance with each copying size to improve copying efficiency. Differences in cycles depending on the copy size as shown in "-" are determined by signals from the cassettes 6 for each size.

Next, the suspension state and restart after copying is completed will be described.

If the power is left on after all copying operations have been completed, the photosensitive drum 15 will constantly rotate, and if the power is turned on at high and low speeds, this is unfavorable in terms of the durability of the photosensitive drum 15 and the blade cleaner 34. . Therefore, in the copying machine of this embodiment, when a certain copying operation is completed and the next copying operation is not performed even after a certain period of time has passed, the main switch 10 is turned off.
Even if it is N, the drum automatically stops and enters a rest state. This time is set longer than the time required for the transferred transfer paper 7 to be discharged outside the machine and for the entire surface of the photosensitive drum 15 to be cleaned. To copy during this hibernation state, press the copy button 13 on the operation section 9.
When is pressed, everything returns to the previous state, the drum rotates, and the document table 2 begins to move forward after 9 CI'. If the copy button 13 is pressed during this pause, the high voltage j+;i 20 is applied and the photoreceptor 15 starts rotating.

Before pressing the copy button 13, the photoconductor 151 is AC
It is maintained at a uniform potential by a static eliminator 22. Then, when the next copy button 13 is pressed and the belt 71L device 30 and ten transfer charger 31 enter, and the photoreceptor 15 begins to rotate simultaneously, the space between the - charger 30 and the ten transfer charger 31 is charged →-. - After the charger, the charger 31 coordinately neutralizes. Therefore, with the vicinity of the charger 30 as the border, the top of the photoreceptor 15 is pole! W
! li potential difference, and the presence of this area on the image forming area has an adverse effect on the image.

This area starts from the AC static eliminator 22 where image formation begins.
The distance to 0 is converted into the number of clocks, and the number of clocks that does not affect the image is 9CP.

FIG. 4 shows the drive system and signal generator.

At the upper end of the rear frame 50 is a control signal magnetic sensing element 4.
8, 71, 72 are fixed to the members 73 and 74. (Figures 2 and 3) Guide rail mounting base 73.
74 has magnetic detection elements 48A, 71, 72.48B, 4
Magnet 1 to which 8C is fixed and attached to document table 2
Control signals are sequentially issued through 61°162. When the copy button is pressed and the document table 2 starts moving forward, the magnet 161 and the element 71 first issue a paper feeding command. The document table further moves forward, and when the exposure of each copy size (B5, A4, B4) is completed and the magnet 161 reaches above the element 48A, 48B, or 48C, a reversal command is issued, and the document table 2 moves from the forward movement to the backward movement. Move to.

As the backward motion progresses, when the magnet 162 reaches the element 72, the document table 2 is stopped at a predetermined position F- in response to a stop command. The size switching command is issued by the cassette 6.

In the clock pulse generation mechanism, a gear 113 is integrally fixed to a sprocket wheel 112 that is driven via a chain 86 from a sprocket wheel 85 attached to the main motor M1, and the gear 113 is connected to a clock pulse generation magnet 163. The magnet engages with the gear 115 fixed to the arm 114 holding the main motor M1, rotates the magnet, and the magnet detects the magnetic detection element [64] fixed to the rear frame 50 at regular intervals synchronized with the rotational speed of the main motor M1. Generate clock pulses.

Next, we will discuss the operation when paper feeding is defective.

In the copying machine of this embodiment, the transfer paper is
If the transfer paper stops due to an accident during the process mentioned above, the printer has a jam detection means to check whether the paper has finished separating and fixing and is ejected from the machine within a predetermined time. If the transfer paper is not ejected outside the machine afterwards, the machine is configured to stop so as not to cause an accident such as a fire.The method for detecting whether or not the transfer paper has arrived is that the transfer paper passes through the fixing heater 124. ,
When it reaches the paper ejection roller 46, it pushes the JAM detection roller 180 installed coaxially with the paper ejection roller. Then, the lever 181 is pushed upward to the left, and the lever 181
The magnet 130 attached to the tip of the magnet 130 is also pushed away from the fixed magnetic sensing element 129 and outputs a signal.

When a jam is detected, the fuser heater is turned off and the main motor M stops, so the drum 95 stops, but the original platen 2
stops after returning to a predetermined position (home position). When stopped, the upper cover 127, which can be opened around the hinge 131 in FIG. 1, opens vertically together with the duct 128. In this state, if there is nothing left on the hot plate 124 and a jam occurs in the fixing section, the upper cover 124
Once opened, the transfer paper can be easily removed by hand. Next, it is rotatably supported by a shaft 132 together with the separating section including the hot plate 124, and is normally held in place by a locking mechanism 133, by removing the locking mechanism after opening the upper cover 127! When the transfer sheet is rotated 9 degrees counterclockwise around 1lI11132, the transfer paper path after the register rollers 41 and 42 is opened, and the jammed transfer paper can be easily removed by hand. At this time, the separation belt 32 is connected to the photosensitive drum 15.
Since the transfer paper is separated from the separator, it is easy to remove the jammed transfer paper from the separating section.

After removing the jammed transfer paper, the jam release operation is performed and the upper cover 127 is closed, thereby restoring the entire machine to its original state.

Next, a method of attaching the cassette 6 to the main body 1 will be described. The cassette 6 is placed on the cassette stand 144 fixed to the aircraft.
When the Ube 145 is placed and the cassette is pushed into the machine, the protrusion 146 at the bottom of the cassette will align with the positioning plate 1 of the cassette stand.
The cassette 6 is pressed into a predetermined position by a spring 149 having a roller 148 so as to abut against the cassette 47.

At this time, a cam 150 provided on the side wall of the cassette and a microswitch 151 (M
SI) and 152 (MS2) to output a cassette loading signal and a size signal.

Next, FIG. 6 shows the overall circuit configuration for controlling the operation of each device in this copying machine. Computer's Ilt[2,I,,I
, a group of input signals are received from each of the magnetic sensing elements, microswitches, etc. described above. 0. ~O1
, outputs signals for driving pulse transformers, miniature lamps, solenoids, electromagnetic clutches, etc. as an output group.

In the center is a microcomputer that processes signals from the input signal group, and since the microcomputer performs time-series processing, it must read one input signal from many input signal groups. Therefore, part of the microcomputer output (hereinafter referred to as probe signal)
is input into the matrix input signal group, which input signal is used as a probe signal to be input to the matrix circuit (Fig. 15), and one signal taken out is read by the microcomputer from ■1 to ■8. It's crowded. The microcomputer processes the read information and sequentially outputs the output terminals θ△ to θ according to the flowcharts shown in FIGS. 11 and 12, which will be described later.
Output to 15. This output signal is output from the output control circuit (16th
(Figure), and after being subjected to logic processing, is output as an output signal group to drive each load.

The microcomputer will be explained with reference to FIG.

FIG. 7 is an internal circuit block diagram of a microcomputer TMS-1000 manufactured by XAS.

Among them, the ROM is a read-only memory in which the sequence contents of the copying apparatus shown in Section 11.12, which will be described later, are pre-ordered in code and stored in each address, and the contents can be retrieved each time the address is set.

The control contents are stored in 8-bit binary code in order from address 0 to the final address required.

R and AM are read/write memories that temporarily store data and the like during program execution, and are memories that store one set of binary codes. More specifically, as shown in FIG. 8, each bit is constituted by a flip-flop, a set is selected by an address designation signal, and data is written into or read from a plurality of seven flip-flops therein. The address in the RAM at which information is stored is specified by the X register and Y register. The CPU also decodes input data, processes the data with an ALU that has addition/subtraction logical operation functions, and a program counter PC, It, and OM that specify the address of instructions stored in the ROM. A page address register PA that specifies a page address group.

Page buffer PB for changing the ROM page, a subroutine is called, execution of the subroutine is completed,
It consists of a subroutine return register SR for storing the original return address, It, an accumulator AR for temporarily storing the 1D operation result for decoding the instruction stored in OM, etc. Input terminals I,, I2.
I,, I8 are connected to INPUT, and output terminals 01 to O15 are connected to 0, ROVTPVT.

To give an overview, the CPU first specifies the address of the ROM where the sequence is programmed, the contents of the specified address are read into the CPU through the data line, the cPU decodes this, and according to the decoded contents, the CPU starts processing from power on. Sequentially, in chronological order, sometimes the data is processed within the CPU itself, sometimes the data in the CPU is stored at a specified address in RAM, and the data at a specified address in R, AM is stored. Sequence control is performed by inputting data into the CPU, sometimes outputting data in the CPU to the output signal line of the output section, or manually inputting data from the input signal line of the input section into the CP TJ. .

The basic timing for TMS 1000 program processing is shown in FIG.

Clock 0 (from nsc in FIG. 8) of several μSeC in FIG. 9 is the basis of program processing.

That is, it takes two clocks to decode the program counter, two clocks to specify the decoded R and OM addresses, and at the same time, the program counter PC is incremented by 1.
It takes one clock to decode one program instruction in R and OM, and one clock to write to RA and M, so one instruction is completed in a total of six clocks. The programmed instructions following the above address are executed at similar time intervals.

(Input signal?-g) The number of status signals to be input from the copying machine is large, and the number of bits of the input port of the computer is 41). Ta. Table 1 shows the relationship between probe terminals θ1-3 and input ports 1-18.

Table 1 CT, KP are clock pulses (generated in synchronization with the photoconductor), PEP is a paper out signal, LEP is a liquid out signal,
C3TP is the copy button, CBHP is the original platen home position, TSC is the toner supply command, PDP is the paper detection signal (transfer paper), B5°A4. B4BP is a document table reversal signal for each paper size, MSI and MS2 are micro switches (for paper size detection), and JAM () is a JAM undetectable signal.

Also, input number? -G■1 is drum clock CI, K P
and an idle time signal L D EN (described later).

In Table 1, the states from the input signal group change every moment -t-, but the computer reads θ11θ2. θ3
Output a probe signal to one of (these θ1.θ
2. θ3 signals are not output at the same time) A desired state signal is read in 4 bits (T, , I2° 1, , I8 in parallel) and it is determined which bit is 1 or 0.

By repeating this operation in chronological order, it becomes possible to judge the input state signal that changes from moment to moment.

FIG. 15 shows an input matrix circuit. 300-30
8,310,311,313,314 are Nantes Gate,
309 is an inverter, and 312 is an OR gate. The terminal numbers of the circuit correspond to the numbers in FIG.

This will be explained using an example of data reading when the cassette runs out of paper and lighting of the paper out indicator lamp.

This paper-out signal is obtained from a combination of a lamp and a light-receiving element set near the cassette attachment in the main body. When the paper runs out, the resistance of the light-receiving element decreases and the detection circuit outputs a paper-out signal (PEP=1). Therefore, the NAND gate 300 of the matrix circuit
Input 3' of becomes 0 level. On the other hand, a probe signal θ1 from the microcomputer shown in FIG. 6 is input to 4' of the NAND 300. This PEP signal sets θ1 and
It will be read from the second input terminal. Reading of other input signals follows Table 1.

In the control flow, reading paper, etc. is performed at 5TEP in Figure 11.
This S'T E P 8 is executed in 5UB2P of 8.
When the program progresses, a level is set at θ1 every time 5UB2P is passed, and 01 is immediately reset to 0 level when reading is completed. The time it takes for this θ1 to reach Sera 1 and complete reading is approximately 60 minutes.
μS e C.

While this θ1 is set, other reading probe signals θ2. θ3 is at 0 level.

That is, since θ1 is now set, the 15th INA
Input 4' of ND 300 becomes 0 level, and output of :100 becomes 1. The output of NA and ND308 becomes 0 level. This is because the human power of 308 ponds, that is, the output of 303,
The output of 307 is in rubel because θ2° and θ3 are not set.

The output 24' line of this 308 is manually input to the microcomputer shown in FIG. 6 and read by the program SUB T,P. The read data is n shown in FIG.
, is stored at address 0 B T 1 (hereinafter referred to as (0, 1)) of the Y register in the AM area. At 5Ur3T and P, it is determined whether B I T and 1 are 0 or 1, and when it is 0, a paper out signal is outputted to θ13 in FIG. 6 as a level. Figure 16 3
When the level is output to 4', the buffer inverter 43
2 is turned on, the output of 432 becomes 0 level, and the paper out indicator lamp lights up.

If there is paper in the cassette, the input 3' of 300 in FIG. The BTTI of Figure 8 R and AM is Lebel.

When BITI is level, it is determined that there is paper, so no paper out signal is output to θ13.

In each of the above program steps, the data of other input groups is read and judged in the same way, but in Figure 15 (Ma)
The input group signal of the IJ Lux path and the logic gate 310 are P
gP, CBI-IP, BP signal 0J311 is LE
P, TSC, MSI signal 0J313 is C3TP,
PDP, MS2゜JAMK signal OJ to CPU
It is intended to supply

The feature of this matrix circuit embodiment is that the document platen reversal signal of each paper size, that is, B5. A4. B4 is input to the OR circuit, and M).On the IJ Lux, only one inversion position A and No. 1 are provided. Normally, the number of input signals to be controlled should be 11, but in this case, the number of probe signals must be increased by one, and there is a limit to the load to be controlled, so only three probe signals can be used as probe No. 714. It has become.

However, we focused on the fact that the document table reversal signals for different paper sizes are not input at the same time, and used the size subroutine to store the paper size in the RAM area, thereby distinguishing the document table reversal position signal (described later). is adopted.

This has the effect of requiring only three probe signals.

Next, the output circuit will be explained with reference to FIG. The terminal numbers of the circuit correspond to those in FIG.

In FIG. 16, inverter 402, inverter 40
5. The circuit consisting of resistor 401, resistor 406, capacitor 403, and capacitor 404 is 5 K)j
It is a z oscillator. This oscillator, in this copying machine,
A triac (not shown) is used to drive the A and C loads such as the main motor, and a pulse transformer is used as the trigger for this triac, and an oscillator is used to drive the triac through this pulse transformer. . Therefore, AND game) 409,410,
411. ．． 41, 2, and 413 all serve as pulse transformer loads.

The output 52 is the 4-second timer output from the time the power is turned on. 76' is a main motor signal. This signal is at O level for 4 seconds after the power is turned on, and becomes level level after 4 seconds.

The output of the inverter 407 is level for 4 seconds. On the other hand, the other human power 31' of AND) 408 relies on the developing device motor, and outputs a level from the time the power is turned on until post-processing begins. Therefore, these AND signals are 4 when the power is turned on.
Outputs rubel per second. After that, it will never reach level 0.

37, the document table moves forward and a paper feed signal is inputted before it reaches the reversal position of B5. When a paper feed signal is input, 37 becomes 0 level. On the other hand, 27 becomes a rubel when the document table moves forward. Therefore, the paper feed signal is output only when the Noru Nl 1415N document table is moving forward. Therefore, the level is not output to A and ND415.

Inverters 416 to 429 are Darlington type transistors for driving the load, and drive the load with an Ashikarvel.

Next, the contents of the loads on the inverters 416 to 429 will be shown.

The inverter 416 in Table 2 is a full exposure lamp (A.T3XP).

417 is in front of Russia, (pgxr').

418 is the AC static eliminator (r-I'VAC) main motor (DI (, MD).

41 and 9 are the document table advance motor (CBFW).

420 is! To the reverse motor (CBR, V).

421 is a ten-form charger, a -charger, a ten-transfer charger (1-
TVDC), original exposure lamp (I EXP) 422
to the blank exposure lamp (BEXP).

423 is the developer motor (DVLD).

424 is the power hold relay (I'T-ICD).

425 is paper feed clutch, paper feed counter (PESD/CNTD) 426 is the toner out indicator lamp ('rEL).

427 is paper (PEL).

428 is liquid (IJL).

429 is the JAM indicator lamp (JAMT,).

Connected.

The paper feed clutch is used to lower the paper feed roller 40 rotating in the main switch on onto the paper.
The power hold relay is switch P H in Figure 23-2.
This turns on the LD. Also, the blank exposure is the first one.
As shown in the time charts in Figures 3 and 14, this lamp is turned on almost in the opposite direction to the exposure lamp (IEXP), so as to eliminate the difference in the surface potential of the photoreceptor. Copy the paper feed counter.

- Counts the number of completed sheets, and + for each CNTD signal.
1 and compares it with the set number of copies, and when the number is the same, outputs a copy end signal (copy button (turns off). 13.1
Figure 4 shows a time chart of input signals and output loads. Since it is clear from the figure, the explanation will be omitted.

Figure m10 shows the sequence control system flowchart.
Further detailed flowcharts are shown in FIGS. 11 and 12. FIG. 10 clearly shows the outline of power-on, process execution, and standby.

The terms "front rotation" and "back rotation" correspond to pre-treatment and post-treatment of the photosensitive drum surface. The pretreatment wipes away toner adhering to the drum surface and blade, contributing to the formation of a good latent image. Also, post-treatment can remove residual toner on the drum surface before it dries. Also, by keeping the charger in operation during pre-treatment and post-treatment, it is possible to reduce uneven potential on the drum surface. In this example, the blade remains in contact with the drum from beginning to end, but by making contact and non-contact depending on whether the power is turned on or off, the blade marks on the drum surface can be reduced.

(Reset) After the power is turned on, the power-up reset signal ( Make PU-R,S). These four seconds are created by a program. That is, as mentioned above, ROM
The number of clocks required to execute one instruction among the instruction group stored in the memory is 6 clocks. This clock frequency is set to 300 KH by O20 shown in FIG.
It is set to z. In other words, the time of one clock is T=x
/f (seconds), it becomes about 3.3 [μ5ec], and with 6 clocks it becomes about 20 [μsec'3]. Therefore, since it takes 20 [μse, c) to execute one instruction, a 4-second timer is created using 200,000 instructions. That is, following the power-on, 10 is entered in the RAM area address 15.2, 15.3, and 15.4.
First, subtract the number 15 in RAM area 1 with O
Repeat until. If it becomes 0, subtract 1 from 15 in It A, M area 2 to make it 14. next,
Enter 15 again into fit A and M areas 1 which are 0. Then, the subtraction of RAM area 1 is repeated until it becomes 0.

Each time it becomes 0, subtract 1 from the contents of rtAM area 2, and
1 from the RAM3 area every time the AIVj2 area becomes 0.
is subtracted, and the process is repeated until RAM areas 1, 2, 3, and 4 all become O. The R and AM area values are determined so that the number of instructions during this period is approximately 200,000. In addition to this embodiment, the 20th method for realizing this 4-second timer is
As shown in the figure.

The method shown in FIG. 20-1 is an oscillator that oscillates a signal at intervals of, for example, one second. A certain output signal of the microcomputer is used to read the oscillator signal into the microcomputer. For example, if the oscillator is used for one second, the microcomputer only needs to count four times, and the number of program steps can be extremely reduced. Also, 20
-The method shown in Figure 2 uses a clock generated in synchronization with the photoreceptor,
This is a method of counting this clock when the frequency is relatively low. The method shown in Figure 20-3 is a method in which the microprocessor driving clock frequency is reduced to a low frequency using a frequency divider and this frequency is counted. This method is effective when creating a highly accurate timer.

Also, since this copying machine will not be used for a long time, toner tends to stick to the cleaning blade if it is left unused, so if it is left unused for more than 7 hours, pre-processing should be performed longer than usual (approximately 40 seconds). It is set to run.

Figure 21-1 shows the external circuit configuration for this purpose, and Figure 21-2 shows a time chart. The circuit configuration consists of a C14 timer circuit, a reset circuit, a delay circuit, a comparison circuit, and a driver circuit.

To explain the operation, when this copier is in operation, the main switch (S
Since W) is ON, the capacitor of the CR timer is being charged via DC 24■. If the charging time is 30 seconds or more, the capacitor will be charged up, and this capacitor has very low leakage current. Therefore, when the main switch is turned OFF, the capacitor starts discharging, and if the left time is 7 hours or more (time for the toner to stick to the cleaning blade), the potential of the capacitor decreases and the next time the main switch is turned on, the comparator ( CMP) is activated by a potential input below a predetermined level, and the output transistor is turned on for a period of time (approximately 10 seconds) determined by a delay circuit.
and outputs a long-time neglect signal LDEN signal.

When the H extension time ends, the reset circuit works and charging of the capacitor starts again.On the other hand, if the extension time is 7 hours or less, the capacitor potential is higher than the predetermined value, so the comparator does not operate.
The output transistor starts charging the capacitor again in the OTi'F' state. The setting time is determined by the capacitance of the capacitor.

After the power is turned on, S'TEPI is first executed in the manner described above, and the developing device motor is turned on. (STEP 2) This developer motor can also pour the developer into the vicinity of the contact between the blade and the drum, thereby dissolving the dried toner on the reblade and drum and facilitating cleaning in pre-processing.

Next, in 5TEP3, it is determined whether or not to disable the JAM detection circuit (hereinafter referred to as JAM killing).

JAM killing is often carried out when performing maintenance services on this copying machine to check the operation of the sequence without feeding paper. In computer control, the JAM detection circuit must be disabled in this case.
The AM indicator lamp operates and the sequence stops, making it impossible to check the sequence.

Therefore, in this embodiment, if CPI is short-circuited to ground before power is turned on in FIG. 8, the output of the inverter 210 becomes high level (hereinafter written as 1), and the matrix circuit (FIG. 15) Enter 21'. On the other hand, the output terminal 52 of the matrix circuit 1' is connected to the output terminal 52 for 4 seconds after power is turned on.
It is input from. Therefore, the output of NAND314 is 4
It becomes O level for seconds. The output of AND310 is in rubels during this time. This is because the 4-second timer is created only by a microcomputer program, so θ1. θ2. θ
This is because the probe signal -J is not output from 3. Then, the output of NAND:U11 becomes O level.

S 'r' 18 P 3 reads this 0 level. As will be described later, the information read in 5TEP3 is stored in R and AM, and is used when determining whether the transfer paper has arrived in 5TEP3B in FIG. 12. Next, proceed to 5TET'4 and the above 4
Determine whether the second timer has timed up, and when the timer has timed up, proceed to s'rEp5 and turn on the load of the main motor, etc.
becomes.

In 5TET'6, Ifl when left unused in Fig. 21 mentioned above.
As mentioned above, the L D EN signal is output from the IT open circuit for about 90 seconds after the power is turned on.
After seconds, the computer reads the L D 13 N signal and T
A flag is set on one stroke of t A M. At this time, the photoreceptor has not yet rotated, so CL KP is not applied.

In addition, 4'f4. After the timer ends, AND201 P U
11.8 signal is at 0 level, so even if the level of the LDEN signal is input, the output of A N'D 201 is at 0 level, so 011.8 signal is at 0 level. As for the output of the gate 202, only the clock pulse CLKP signal generated in synchronization with the photosensitive drum is input to the computer.

= 4 seconds After the timer ends, the content of the data read in 5TEP6 is judged in 5TEP7, and if the left time is 7 hours or more, the drum is further rotated in 5TEP8.9 and pretreatment is performed for 40 seconds. During this time, only the load turned ON in STE'P5 is being driven. If the leaving time is less than 7 hours, the preprocessing 40 second timer will not operate and the 5TEI'
10. Here, while the 40 second timer is not up, the subroutine SU BCB 几V, SU
Execute BT, P, SUB 5IZE.

, m17) SUB CBI' (V, SUB LP, 5U
While the 40-second timer is running, BSIZE constantly detects if the document table comes into contact with the document table and moves out of its normal position, if there is no paper inserted in the paper cassette, or if a cassette with a different paper size is replaced midway. This is a routine for

These 5UBROUTENs will also be used in subsequent steps.
are installed everywhere.

The 40-second timer is a clock pulse (CLK, P) that is generated in synchronization with the photoreceptor described above (one clock time is approximately 0
．． 5 seconds) by counting 80 clocks. When the 40 second process is completed, S'l"l;', P1.
0, count 0 to 11. As mentioned above, this copying machine performs preprocessing one revolution without struggling to perform preprocessing for 40 seconds. If pre-processing is performed for 40 seconds, perform one rotation of pre-processing after this, and if pre-processing is not performed for 40 seconds, P
After completing UR8, perform 6Q processing once. C in 5TEPII
I counted 10 L K P, but let's decide.

This is to prevent the copy operation from starting until at least 10 clocks have been counted, assuming that the copy button is pressed during preprocessing.

FIG. 17 shows details of the contents of 5TEPI 0 and s'rgp11(7). In Figure 17, s'rpP1゜-1
10 clock count is started at 5TE1)10-2, clock reading is started, and it is determined whether the clock signal CLKP is level or 0 level. If CLKP is now 0:00, the process advances to STEP 10-4, and it is determined whether the document table is at the normal position (Baum position) before scanning. If it is not in the normal position, the document platen back motor ON signal (
Fig. 8 θ6 output) is output. Furthermore, it determines the paper size and monitors the loading of the cassette, and also determines the presence or absence of liquid and displays the placement of the cassette. If CL K P becomes 0 level, 5TE
Proceed to PIO-7, 5TEPIO-8 and repeat the same process. If cLKP becomes a level again, it means that 1 clock has been counted, so repeat this and s'rEp1
I counted 10 clocks in o-12, but I will judge.

While counting the 1Q clock, other controls are always possible continuously, regardless of whether the clock is level or 0 level.

This control method has since become the basic control method when performing other controls while reading C and L KP. This method is particularly effective when it is necessary to detect the protrusion of the document table from its home position while counting the clock while performing other functions [1]. In other words, even if the document table is inverted at the reverse position (r'3), the home position is detected, and the document table back motor is turned OFF, the document table still protrudes from the home position. (due to contact with other people).

However, in order to correct this protrusion, if you want to detect the protrusion of the document platen when the clock is at the 0 level or level, for example, if you create a program that detects the protrusion only at the 0 level, the document platen back motor will be activated when the clock is at the 0 level. An attempt is made to turn on the document table and return the document table to the stop position, but during the return, the document table back motor remains ON even if the clock changes to the level, so there is a risk that the back motor will be overloaded.

Next, after the CL K P 10 count is completed, 5TEPI2 is executed to check whether the copy button is pressed. If the copy button is not pressed, use S'rE'rl to count the remaining 6 clocks of one rotation of preprocessing.
3.5 Execute TET'l 4. If the copy button has been pressed, the process advances to 5TEP21 to execute the copy process.

After completing one rotation of pretreatment, proceed to 5TEP15 and 5TEP
Turn off all but the main motor, high voltage AC, and blank exposure that were turned on in s.

Then, proceed to the post-processing step (2) described in "1ff".

During this post-processing, the potential on the photoreceptor is made uniform.

During this post-processing, even if the main switch is turned off, a power hold signal is generated to maintain the power supply to the control circuit.

Even during post-processing, 5TEP16 is executed to detect whether the copy button is pressed and to rotate the drum twice for post-processing, that is, to count 32 clocks. If the copy button is on, the process advances to process 5TEP2z. When the post-processing is completed, the copying machine goes into standby mode. This is why all the loads in 5TEP19 are set to OTi"F.

During standby, it is necessary to always detect whether the copy button is pressed, and this is executed in 5TEP20. Copying machines are often left in this standby mode for long periods of time, but since the internal temperature of the copying machine is higher than the room temperature, some of the toner that has adhered to the cleaning blade tends to stick to the copying machine.

Therefore, there is a possibility that the next image formation will be adversely affected. Therefore, during standby, the clock is counted using the means shown in FIG. 20, and after several minutes have elapsed, the main switch is turned off.

Next, when the copy button is pressed, it is determined at 5TEP12, 16°20, and the load shown at 5TEP2111a is turned on, causing the drum to rotate.

And in order to avoid the drum area that has a negative effect on the image, 9
Do a clock count. 5TEP22 is a step for determining whether the stop button is pressed and the copy command is interrupted. If the process is not interrupted, the CBFW signal is outputted from the output terminal θ5 after 9 clocks have been counted in step 24, and the document table is moved forward. Since the minimum paper size is B5 size, the document table first reaches the B5 inversion position. Then, the signal B5BP is output.

The paper feed signal PE5P is obtained from a Hall element provided at a position before the reversal position of B5 as the document table moves. 5T when checking B5BP at 5TEI”26
At ET'27, the S U I3 T S L routine is performed to detect the developer concentration. If the developer concentration is low at this point, a toner out flag is set in the RAM and used for sequence processing, which will be described later. Next 5TEP28
In the paper size determination routine, it is determined which paper size cassette is currently installed.

As mentioned above, this is a microswitch MSI.

A paper size signal is created by combining MS2.

There are four possible combinations, but this copying machine uses three sizes, so the remaining one is used as a signal when no cassette is installed.

8TEP28 determines the paper size, sets the size flag in RAM, and stores B5. A4. The process branches to one of the flows related to B4 size (FIG. 12). In addition, after pressing the copy button, rotate the drum for more than 9 clocks,
It is a good idea to clean the drum surface.

The B4 size will be explained in detail below.

At 5TEP84 in FIG. 12, it waits for B5 to pass through the reversal position. A magnet provided on the document table for detecting the inverted position of the document table has a certain width. Therefore, it takes a certain amount of time (several hundred m5ec) for the document table to pass over the Hall element.
It takes. During this time, the microcomputer executes the previous paper size determination routine. Then, it waits for a sheet of paper size other than the desired size to pass through the reversal position.

That is, for the A4 size, the fall and rise of the signal of the B5 back position detection ball element are detected, and for the 4 sizes larger than A4, the B5. The passage is determined by detecting the fall and rise of the signal of the Hall element for detecting the A4 reversal position (S'l"EP84.85.86). Then, 5TEP87 moves the document table to the B4 reversal position. When the arrival is determined, the document platen advance signal CBFW is sent by 5TEP88.
1 Turn off the blanking lamp BEXP and turn on the reverse signal CBRV.
Output.

Next, 5TEP89 is the accumulated jam detection routine PDPI, and when the document table reaches the reverse position of B4, the paper detector 18
0 (Figure 1), it is determined whether paper is detected or not, and when the transfer paper ejected from the previous process remains in the machine, the progress of process 5 TEP is stopped, a stagnation signal is issued, and the next paper is sent. to stop. This is effective during continuous copying.

If the paper is not retained, it is determined in step 5TEP90 whether the document table has returned to the home position, and when it has returned, the document table stops moving backward (STEP91), and the process proceeds to a paper delay jam determination routine PDP2 (STEP92).

Note that the subroutine TSSD is executed between the determinations of B4BP and the original platen stop position. This routine is S'rE
In the TSL routine of P27, T1. The flag set in A M is reset when the developer concentration is restored when executing 5TEP8'7°90.

Also, the JAM detection PDP2 routine of 5TEP92 is a delayed JAM detection, and since it has been determined in 5TEP8'l that 1 sheet h+J of paper is not retained, this time, the transfer paper that has been transferred and is about to be ejected is inside the machine. Detects cases where the paper is not fed due to a paper jam or a misfeed. That is, if the transfer paper has not reached the JAM detector at the time of 5TEP92, a delay alarm is issued and the next paper feeding is stopped or the machine is stopped. 5
If TBP92 determines that it is not jammed, 5TE
Proceed to P93 and check the copy button to determine whether to copy one copy or multiple copies. If one sheet of metal plate is to be copied, 5TT8P94.5TEP95, which counts 7 clocks, is executed.

This is a program that prepares the timing for entering post-processing 5TEP■. Relatively short paper such as B5 size is ejected faster than B4 paper, so
Enter post-processing with a number less than the clock. Note that even if the paper size is different, the paper always enters the post-lighting process in which the trailing edge of the paper finishes passing through the paper ejection roller.

Also, post-processing is performed regardless of the paper size.
The timing can be changed so that the post-processing starts at the lock position from the back position of 5.

5TEP96 performs a determination that there is no replenishment toner.

It is a routine place. This l'lJ constant is the flag that was set when the developer concentration was low at the back position of B5 in 5TEP27, and when it could not be reset because the developer concentration was still low in SUB TSSD such as 5TEP87゜S'rF'P90. Immediately before starting post-processing, the density is determined again and if the developer is thin, a message indicating that there is no toner is output.

Since it takes a long time from the back position of B5 to the start of post-processing, even if the developer concentration is low, if there is replenishment toner, the concentration will be restored to the specified concentration immediately after replenishment. Input signal TS at that time
C becomes a signal that the toner is thin for a long time, that is, there is no replenishment toner.

A'I in Figure 19-1 explains this in detail.
'Il, circuit and flowchart of FIG. 19-2. Figure 19-2 shows I/X for B5 size. 1st
In Fig. 9-1, 501 is a circuit for determining the concentration of the developer, and if the concentration of the developer is low, the output of 501 becomes Level.

On the other hand, the toner supply [RF function period] is from the time when the document table moves forward until the start of post-processing. If there is no toner supply area, for example, if the main switch is repeatedly turned on and off, it will be counted as 1 each time (;j ”
”; may appear. This is because the liquid concentration is determined by irradiating the liquid passing through the slit with a lamp, receiving it at the light-receiving element, and detecting it by the change in resistance of the light-receiving element. In this case, turn on the main switch. , since the lamp lights up before the developer motor starts rotating and the liquid flows into the slit, the resistance value of the light-receiving element is small, which is equivalent to the liquid concentration being low, and the toner is supplied. If the main switch is repeatedly turned on and off, the concentration of the developer becomes abnormally high, which adversely affects the image.

Even if the combined solution concentration is low and the output of 5O1 is 1), the signal TSC is short-circuited to ground because the transistor 506 is turned on. This is because the signal 07 from the microcomputer is at the 0 level, so the output of the inverter 508 is 1, and the transistor 506 is turned on.

On the other hand, when the document table moves forward at 5TEP25-1,
At the next S T Fi P, a toner replenishment enable signal is output. Therefore, for the first time at this time, the output of the innocouple 508 becomes 0 level, the transistor 506 becomes opF, and the output signal of the operational amplifier rjj 501 becomes the transistor 502.
The toner supply solenoid 503 is activated.

However, when there is no toner, the output of the operational amplifier 501 is 1.
The output of input 505 becomes 0, and a signal indicating that it is thin is read into the microcomputer through the matrix circuit. That is, in the TSL routine of 5TEP27, the toner out flag is set to 1" (AM area memory, and in the TSSD routine of 5TEP30.41, the flag is not reset. E L routine (B4
In the size S'l'EP96), the setting of the flags in the R and AM areas that were previously set is determined and a message indicating that there is no toner is displayed.

When JAM detection and toner out judgment are completed, 5TEP50
Alternatively, the process moves from 96 to (2) in FIG. 11, enters post-processing, and repeats the above-described operations.

We have just explained one-sheet copying, but in the case of multiple-sheet copying, when the document table reaches the home position and ST'FJP93 determines that the copy button is still pressed, the 11th
Moving to Figure ＠, the document table 1ij decimal signal is turned ON again, and the same process is repeated thereafter.

Up to this point, we have explained the B4 size sequence, but the same applies to the other B5 size and A4 size, and the only difference is the JAM detection method, so we will omit the explanation.

The JAM detection method will be specifically explained with reference to FIG. B
In the case of size 5 (Figure 18-1), the document table first reaches the home position at 5TEP30, then the routine proceeds to the routine shown in Figure 12 (■), the clock is counted 5, and the transfer paper is placed on the paper detector 180 at 5TEP45. If it is not determined whether the paper is present or not (the previous sheet has accumulated), 5TEP 48 further counts 4 clocks and determines whether or not the paper has reached the paper detector 180. If the signal has been reached, the signal from the Hall element 129 is at O level as shown in FIG. 23(C). (Transfer paper delay)
If the transfer paper reaches the paper detector 180, it indicates that the transfer paper is being fed normally.

On the other hand, regarding B4 size, it is as shown in Figure 18-2 (
(mentioned above). If this operation is shown in a time chart, No. 18-3
It will look like the figure. Therefore, the B5 size uses a clock, and the B4 size uses the B4 inversion position signal and stop position signal. In this way, since jam detection is performed by selectively using the clock and the signal on the document table depending on the paper size, it is possible to conveniently perform discrimination control even when the jam discrimination and load operation are similar. Furthermore, in case of continuous copying of a large number of sheets in B5 as shown in FIG. 18-3 (C1), the delay is determined by B5BP and only the last copy is based on the clock.

Moreover, in this example, B5. In the A4 size, a clock is used to detect JAM, but it is possible to detect JAM using the clock φ for the drive of the microcomputer mentioned above.
An external low frequency oscillator can be used.

In the method of disabling these J A and M detection operations, in this embodiment, the CPI (JAMK) in Figure 8 is shorted to ground, but the number of copies etc. can be determined externally electrically. This can be done using the numeric keypad for input operations. In other words, JAM kill, liquid kill signal LEP is ignored), paper kill 1, TAM kill, liquid kill signal, paper kill signal PE
By inputting data using the numeric keypad (before TEP4 in FIG. 11), and setting a flag at a specific address in the RAM area, it is possible to detect a jam in advance during programming. Perform this step just before the liquid/paper discrimination step.

When the program is executed at this step, the corresponding killing data storage address of AM is read out and it is determined whether the flag is 1 or 0. If it is 0, each determination step is When the value is 1, the determination step is jumped and the process proceeds to the next sequence step.

Moreover, in the present invention, B5. To automatically return the original platen to the longest paper size even if the magnetic detection element for A4 or the like is damaged. If the magnetic detection element that detects the document platen reversal signal for the longest paper size is damaged, the document platen advance motor may be overloaded because there is no reversal input.

When the document table moves forward, the time from when the document table advances to the reverse position of the document table for the longest paper size is fixed, regardless of the paper size, so set the timer for this fixed time.
Make by counting P. Therefore, as described above, since the paper size flag is stored in memory, if a predetermined reversal signal (at the time when predetermined OCT and KP are counted) is not output for a predetermined paper size, the document table is automatically reversed. This timer counts the aforementioned CLKP, uses an external low frequency phase, or uses a frequency obtained by dividing the microcomputer drive clock φ.

Table 2 is 11. , 12 is an example showing the flow of FIG. 12 in program code, and since the command words are clear in the TMS 1000 user's manual, they will be omitted.

Next, the power supply circuit shown in FIG. 22 which supplies the microprocessor will be explained. This circuit consists of a 15V stabilized power supply circuit and a 15V shutoff circuit.

In this copying machine, even if the main switch is turned OFF during the post-processing after the copying operation is completed, the post-processing is executed to the end and then the rotation of the drum and the passing of the load are stopped. A control step is provided to issue a power hold signal when processing begins. In this copying machine, a control circuit,
There is a power transformer to supply DC to the low DC load. 24 on the secondary side of this power transformer. A V rectifier circuit is used, but a very large capacitor (for example, 2200 μF) is inserted in the smoothing circuit of this rectifier circuit. -In the unlikely event that this power transformer is turned ON or OFF on the primary side,
A line where AClooV is supplied by the main switch for use, and A
There is a line to which ClooV is supplied.

Even if the main switch is turned off during post-processing, A and C
The signal that drives this circuit so that 100V is supplied is the power hold circle-1L I) signal described above. The cleaning blade can be removed from the drum by turning off the pH-LD, and then brought into contact with the drum by turning on the power.

Now, suppose the main switch is turned to "OF T" during post-processing,
If the power hold signal is output and the power hold signal is 0FFI after post-processing, the primary side of the power transformer is 0.
It becomes FF, and the rectifier circuit on the secondary side of the power transformer also becomes OFF. However, because the capacitance of the smoothing capacitor in the circuit is large, the discharge time is long (approximately several hundred milliseconds).
ec).

Moreover, there is a margin in the operational range of the power supply voltage of the microcomputer. Therefore, if the power supply voltage waveform falls in a gentle curve around the voltage at which the microcomputer starts to malfunction, the microcomputer's R,
AM, ROM, etc. begin to malfunction. At this time, RAM,
When the power hold signal is output by the 1'fpt output of the ROM, the AC 100V line mentioned above becomes active again even though the main switch is turned off and the rotation is completed.

In this case, of course, the other 11 of the microcomputer, A
The values in the M area are also incorrect, causing display lamps such as the JAM display lamp to turn on, which adversely affects operation.

FIG. 22 shows a shutoff circuit that eliminates this drawback. In the figure, 601 is a resistor for flowing Chener current, 602 is a 20V Chener diode, 605 is an NPN transistor, 604 is a transistor collector resistance, and 607 is an NPN transistor.
PN ) transistor, 606 is a transistor collector resistance, 608 is a voltage drop resistor, 611 is a 16V Chener diode, 610 is a silicon diode, and 609 is a control transistor.

To explain the operation, a resistor 608, a transistor 609,
Since the circuit formed by the Zener diode 611 is a known constant voltage circuit, its explanation will be omitted. The Chena voltage of 602 Chena diode is about 20V, and 6O
A basemi current is supplied to the transistor 605 through a resistor of 1. If +24V is currently input to this circuit (the input is connected to a circuit that smoothes the transformer output, and the 15V output is connected to the computer power supply terminal), that is, while post-processing is being executed, a Chena current flows through the Chena diode 602. Transistor 605 becomes conductive and resistor 604
A current flows through the transistor, and the collector of the transistor is at approximately O potential. On the other hand, since no base current is supplied to the base of the transistor 607 through the resistor 604,
Transistor 607 is in a non-conductive state. Therefore, only the Chena current supplied to the resistor 611 flows through the resistor 606, a Chena voltage of 16V is maintained across both ends of the Chena diode 612, and a constant voltage of 15V is supplied to the output. However, as mentioned above, after the post-processing is completed, the power hold signal is output from the control circuit and +2
The 4V power supply also gradually decreases.

When the +24■ voltage becomes around 20V, the Zener diode 602 becomes non-conductive, the transistor 605 becomes non-conductive, and the transistor 607 becomes conductive, the collector of the transistor 607 becomes approximately O■ potential, and the 61
1, no Chena current flows and the output voltage becomes 0V.

At this instant, the diode 610 is connected to the transistor 609.
It is included to block the reverse voltage applied between the base and emitter of the

In this way, when the +24■ voltage reaches around +20V, the power supply to the load is forcibly stopped.

Therefore, even if the discharge time constant of the smoothing circuit is extremely large, it is effective for control circuits having memory circuits.

Table 2 OPT LIST, XRE' BRLBD[]DPA
GE 0 MNEZ LBCCCBL L13GGGBRLBAA
'LBDDD TCY 4DYN TCMIY 3 MAN TAN LBHH)l CALLL 5UBSIZEN
EZ BRLBBB CALLL 5LIBLPlYN DMAN CALL SUBCCMDTAM MNE
Z MNEZ ERLB997 BRLBCCBRLB991( LB997 BL LB34 BL UBDD LBAA IYCLB996 CALLL 5UBCB
RVBL LB5 CALLL 5UBCNTLB day B
IYCTCY4 DM8N BL to LB4 TAM LBCCIYCMNEZ BRLBHHH BL LB3 LBAAA CALII; 5UBCNT BL LB
BBBTCY 4 PAGE 1 DM8N TCY 2 TAM SETR MNEZ TKA BRLBCCCR9TR TCY 0 LB300 ' TCY 3TAM TC
MIY 4 TBITII LBX TCY +5 BRLBA TCMIY O BROTCY 3 ETN LBA BL LB25 LB301 TCY 2SU
BSIZE BRLBB 5ETRLBC' 5ETR
TKA TKA R9TR R5TRTCY 0 TCY OTAN TAM TBITI 3 TBITI 2 BRLB303 BRLB301 TCY 3 T(:Y 2 TCMIY2 SETRBRLBX TKA LB303 TCY 3 R9TRTCM IY! TCY 0 BRLBX TAM LBB CLA TBITI3 TCY 3 BRLB300 TAM TCY l TCY 2 SBIT l BRLBC TMA , PAGE 2 TDO5UBPDP! TCY 1 TCY 3 SETR TCMIY 0 TKA TCY 15 RSTR TCMIYI Ti1l:Y 0 TCY 3 TAM RETN TBITI 3 BRSUBJAM CALLL 5UBCBRVLBD
RETN TKA LB? OOCALL SLIBjAM SlIBPDP2 BRLBCQ BL LB901L
BCJ 5ETRLBCQ TCY42TKA TBI
TI 3 R9TRBRLBD TCY OTCY 1 TAM BRLBCJ TBIT13 LB799 TCY 1BRLBO5E
TR BRSIIBJAM TKA SUBJAM CY1111sTR 5BIT 3 TCY 0 MA TAX TDOTBITI 1 TCY 10 BRLa5O9 SETRTCY 5 LB800 DYN 5ETR R3TRBRSUBJAM YN EC6La5O9Tσ 5 BRLa8O0R3TR TCY 4 BRSUBJAM LB900 R9TRPAGE 3 DYN 5UBCNT TKA YNEC0TCY 0 BRLa2O2TAN BRLB799 BITI O BR5LIBCNT LBI NTI CALL 5UBSIZE La5O
1TKATCY 0 CALL 5tlBLP TAN TBITl O BRLBE TA to BRLa5O1rt++T+'2 SUBTSSD TCY I BRLBESETRLB
CQ0 TCY 14 7KA MNEZ R3TRBRLB801 TCY 0 RETN TAM La2O2TCY ] TBTTI 2 5BIT 0 BRLBLLL TMA BRLBE TDO LBLLL TCY 14 TCY 6TCMIY 0
R9TR RETN LBE RETN SLIBTSLTCY, 1PAC, E4SETRSUB
CCMD TCY 0 TKA 5ETR R9TRTKA TCY Q R9TR TAN, TAM TBITI 2 TBITI 3 BRLa5O0BRLB401 TCY 14 La2O2TCY 2 TCMIY 1 TCMIY 0 RETN BR LBF LB500 TCY 14 LBJ01 TCY, 1T
C: MIY 0 TMA RETN ALEC1 SUB placement TCY I BRLa4O2SETRBRL
B400 17KA La2O2TCY 2 RSTR' TC:MIY 1 CYO! BF DYN RETN CALL 5tlBLP LB45 TCY 2 SETRCALL 5UBCBRV TKA TXA R5TRTCY 0 TC:Y OTAM TAN TBITI 0 TBITI I BRLBCK BRLBK Tomo BRL BINT2 BRLBNNN LBP TCY 2 TCY ll 5ETRDMAN TKA TAM RSTRMNEZ TCY 0 BRLBJ BRLB999 LBK CALLLSUB placement TAM
RSTR TBITIOTCY 0 BRLa9O00TAN TCY 5 SETRRBIT I RETN A LBloo TCY 5 TDO RSTRLa2O3RETN E7N SUBLP TCY 0 LBJ BL LB51SE
TRPAGE I(TMA R3TRLB48 CALL 5lIBTSS[l↑C
Y 0 TAM BL LB45 TBITI2 LB47 TCY 2 BRLa2O05ETR TC:Y I TKA SBT 2 R5TR TMA TCY 0 TDOTAM + TCY 15 BRLB47 NEZ TBITI l 5ETR B TMA 5ETR DO BRLa2O3CALL 5LIBPDPILB20
2 TCY I LBJ9 TCY 15ETRLP4
0 CALL 5UBPDP2TKA TCY ll R3TR1CMIY? TCY 0 TAN LP41 CALL 5UBCNTTBIT
I] TCY II BRLBS0 DMAN AN CALL 5usrssn BRLB49 CALL 5UBSIZE1, B50
TCY 5 R3TRCALL 5UBLP CALL 5UBPDP2 CALL 5UBCC
:MDTCY II MNEZ TCMIY7 BRLB to BRLBO LBS1 CALLSUBSrZE LBOTCY
IINEZ CALL 5UBLP' BRLB42CALLL
SUBCCMD CALLL SUB place NEZ BRLBL BL LBlooO CALLL 5UBCNT LP42 CALLL 5
UBCBRV CALL 5UBTSSD CALL
5UBTSSDLDP 5 BRLB41 BR0LP43 TCY 8 5TR LBL BL LBIEI TCY 4PAGE 7
5ETR TCY it DMAN sETRTAM TCY 5 BRLB34 STR DMAN LB3fi CALLL 5UBP[1Pl
TAN TCY 4 MNEZ, TCMIY 4 SRLP44 LP37 CALL 5UBTSSD CALL 5
UBPDP2 CALL 5UBCNT 8L LBP TCY 4 MAN LP44 CALL 5UBTSSD TAMBRL
P43 MNEZ LBM BL LBU6 SRLB37PAGE 8 LP34 TCY 6 CALLSUBPDP2ET
R TCY 5 BL LBP R5TRLP01 TCY El TCY, 8 5ETR R9TRCY 8 TCY 4 R5TR 3ETP TCY 5 MNEZ R5TR 15LP35 'TCY 4 BRLP01 5ETR NEZ LB35 CALLL 5UBCNT BRLB39BL
LBP CALL 5UBTSSD TCY 4 LP39 CALLSUBCNTCAL
LL 5UBTSSD TAM L13! TCY 4
MNEZ DMAN BRLP33 111j AM BRLP01 BL LB40 PAGE 9 TCY 5 LP33 CALLSUBTS SDMA
N TAM CALL SUBC BRV MNEZ BRLB32 BRLP30 LB2000 TCY 4NEZ CALL 5UBPDP2 BRLBS LBBRL
BT BL LBP LBT CALL 5UBPDP2 ShiB30 CALL 5UBTSSD CALL S
UB placement BL LP29 LB LB31 TCY 5 BL LBlooO1, BTC
MIY 4 LBZ MNEZ BRLBU LP32 CALLLSUBCNT BRLBVCAL
LL 50 days 5IZE LBU BL LB12CAL
LLSUBLP LBV BL LBIOLBT TC
Y 1 CALLSUBCCI4D RBIT ITCY 3 BLLBXOREN LBRTCY 5 DMAN LBQ BL LP43; BL LP23 LBKKK TCY 1PAGE
10 5ETR 14TCY2 TKA SETRRSTR TKA TCY 0 RSTRTAM TCY OTBITII TAN BRLB27 TBITI l BRLBKKK BRLP24 LP27 TCY 5 BRLBen R5TR 15CALLL 5UBSIZE CALLI, 5U
BSIZETBITI 1 BRLBY CALL SU day LP BL LP45 CALL 5UBC:C to DNEZ f CALLSUBTSL BRLB2828 TC
Y5 SETRBL LB31 TCY 8 LP28 TCY 5 SETP TCMTY 4 TCY 4 R9TRLP29 CALLL 5UBCNTTCY
4 CALL 5UBCNT 5ETR TCY 8 CALLL 5UBCNT R5TR 15P 9 CALLL 5UBCNT Day R0 LBW LDP + CA [, LL 5UBPDPI BR0PAGE +1
CALLSUBLPCALL 5UBPDPI
CALL SUBCCMDLB20 TCY 2 M
NEZ SETRBRLB995 TKA BRLB994 5TR TCY OLP995 BL LB38TA TBITI l LP994 CALL 5UBCB
RVBRLP01 CALL 9UBTSSD BL LB2000BR
LP20 LBXOMNEZ SRLBCY LP21 CALLSUBPDP2 BRLBCZB
L LP999 LBCY BL LB29LB22
BL LBAAA LBCZ BL LBRPAGE
12 LBBBB CALL 5UBPDPITCY 4
CALL SUBSIZETCMIY 4 TBIT
I 0 BRLBI7 LB23CALLSUBTSSDBLLB24CAL
LL 5UB(:NT LBI7 CALL 5UB
TSLTCY 4 LBIII TCY 4 DMAN R9TR To TA TCY 5 ETR CALLSUBSIZE TCY 8ETR TCY I LBEEE CALLSUBCNTSE
TRTCY 6 TKA 5ETR R9TRCALL 5UBTSSD TCY 0 TCY 5 TAM R9TR TBITl I TCY, 8 SRLBI8' RSTR TC:Y 4 CALL 5UBTSSD 5ETRBRLBIII
DMAN LB18 TCY 5 AM R9TRMNEZ TCY 4 BRLBEEE TCMIY 2 LDP , 11 R0 LBGGG CALLLSUBTSSD PAGE +
3LBIOTC:Y 3 CALL 5UBSIZE R5TRTCY 4 CALL 5UBLP R3TR TCY t.

CALL SUBcCMD LBII R9TRMN
EZ flYN BRLBI9 YNEC5 BRLBII BL LP01 LBI9 TCY4 'CALLSUBCBRVMA
c IA CALL 5UBSIZE A TAN CALL 5UBLP CALL SUBCCMII TCY 8ETR BL LBZ TOY 8 LB12, 7(1:Y II SETRTCMIY
9 TCY 5 LBI3 TCY 3 R3TR ETR TCY 7 BL LBP LB14 5ETR IYC: LBOOOBL LBIO YNEC10PAGE 14 BRLBI4 TCY II TC and TYfl CALL 5UBCNT LB8 CALLL 5UBCBRV CALLL 5UBCBRV CALLL 5UBSIZE CALLL 5UBSIZE CALLL 5UBLP CALLL 5UBLP CALLL 5UBCCI4D CALLL SUBCCMD MNEZMNE ZBR
LB985 BRLBI5 BRLBI384 BL LBlooOLB兇S BL LBI2LB15
TCY 10 0MAN LBIa84 CALL 5UBCNTT
AN TCY 11 MNEZ DMAN BRLBI3 TAM LBlfl TCY 4 MNEZ SETRBRl, Be LBlooOTi1l:Y 7 BRLB3000R3
TR' TCY 13 TCY 13 DMAN TCMrY 2 TAN TOY 6MNEZ R5TRBRLB5(100 LB5000 TCY II TCMIY 0' BL LBOOOLB3000
TCY 9 PAfl;E 15R3TRLDP 15 TCY 10 LIIX 0 9ETP TCY 10 LSI R3TR CALL 5UBC: BRV dingCMrY 0YN CALLL 5UBSJZE DYN BRLBI CALLL, 5U BLP CLO TCY 9 CALL SUBCCMD SETRMNEZ Ding C
Y 7 BRLP993 LB3 TCMIYIO811LP9
92 LB4 DingCMIY 15LB993 TCY
10 LB5 TCMIYI5R3TRTCMIY 1
5 BL LBI2 CALLL 5UBCBRVTCY
12 LP992 CALLL SυBCNT Ding KATCY
II TAM DMAN DING CY 10 TAN LB8 0MAN MNEZ TAN MNEZ BL LB18 BRLB6 END YN MAN AM LDP 0 R0 LBDD TCY II TC) IIY 10 TCY 3 ETR TC Y 7 ETR TCY 8 ETR TCY 8 5TR LB7 BL LBINTI LBRLP CALLL 5UBCBRVCALL, L
5tlBSIZE CALL 5UBLP TCY 11 MAN AN MNEZ 日RLB7 LOP 14 R0 LBFFF CALLL 5uBTSSD

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an example of a copying machine according to the present invention, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a first cross-sectional view, and FIG. Figure 5 is a perspective view of the cassette, Figure 6 is a control circuit diagram, Figure 7 is a block diagram of the microcomputer, Figure 8 is a RAM area diagram, Figure 9 is a basic time chart of the microcomputer, and Figure 9 is a basic time chart of the microcomputer. Figure 10 is a system flowchart of the operation of the copying machine in Figure 1, Figures 11 and 12 are detailed flowcharts of Figure 10, Figure 13 is an operation timing chart for B5 size, and Figure 14 is an operation timing chart for B4 size. , 15th
The figure is an input matrix circuit diagram, Figure 16 is an output control circuit diagram, Figure 17 is a clock level and θ level control flowchart, Figure 1-8-1 is a B5 size jam detection flowchart, and Figures 18-2 are B4 size jam detection flow, chart, No. 18-3 [l! 5 is a timing chart of jam detection, Fig. 19-1 ATR flowchart 1. Figure 19-2 is the ATR circuit, Figure 20 is the clock generation diagram, Figure 21-1 is the measurement circuit when left unused,
2 is an example of the operation time chart 1 of fts 21-1, FIG. 22 is a power supply circuit, and FIG. 23 is a circuit example of the input sensor of FIG. 6. In FIG. 6, rl, r2. r4. rB is an input terminal to the computer -101 to 015 is an output terminal to the computer (', A4B P , B 4BP , B5BP
lfBX document table inversion position signal, MSl and MS2 are cassette size I, No. 1, DDP is paper detection No. 48, TSC is a toner density signal, and TSE is a toner replenishment enable signal. Applicant: Canon Corporation Ma
lf sill ((1) (bn(C) No.?!-! Figure 2/-2 Commissioner of the Patent Office Manabu Shiga 1 Display of the case 1982 Patent application No. 112862 2 Name of the invention Image processing Apparatus 3, relationship with the person making the amendment/rrn Patent applicant I 1 Location Higashi IIT Tokyo Metropolitan I 11-ku Shimomaru F3-30-2 Name ((+00) Canon Co., Ltd. 5, Specifications subject to amendment 1 6, Amendment Contents (1) Delete page 4, line 8 to page 6, line 8 of the EIIJ specifications. (2) Change ``The work was complicated. (3) Delete page 6, line 16 to page 11, line 9 of the same document. Te U Kine City Official Book (Method) 1981 Patent Application No. 112862 2. Name of the invention Image processing device 3. Relationship with the person making the amendment Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (+00
)Representative of Canon Co., Ltd. Ryu Kaku 3 Part 4, Agent address: 14θ 3-30-25 Shimomaruko, Ota-ku, Tokyo Date of amendment order October 30, 1980 (shipment date) 6. Details subject to amendment Write and draw. (Content [2 changes hidden.)

Claims (1)

[Claims] comprising a means for image processing, a control means including a memory storing a program for controlling the processing means, and a means for generating clock pulses, and causes the control means to execute control in accordance with the clock pulses, An image processing device further comprising: forming a timer signal using the clock pulse, and controlling the processing means using the timer signal.