JPS60136765A - Image processor - Google Patents

Abstract

PURPOSE:To skip unnecessary processes and perform image formation repeatedly in a short time by storing a memory with a program for every repetition of an image forming cycle, and performing sequence control. CONSTITUTION:A microcomputer reads a program out of its internal ROM according to a clock from an oscillator OSC and also generates an output AEXP for entire-surface exposure lamp control, output PEXP for pre-exposure lamp control, output HVAC for destaticizer control - output TEL for toner empty display, output PEL for paper empty display, output LEU for liquid empty display, output JAML for JAM display, etc., according to inputs from respective sensors through a matrix circuit to perform the image formation under the sequence control. This internal ROM is stored with the program for every repetition of the image forming cycle and unnecessary steps are skipped to shorten the repetitive image formation time.

Description

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

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 having a photosensitive member consisting of a conductive layer, a photoconductive layer, and an insulating layer is uniformly pre-charged by a primary charger as the drum rotates. (for example, positively charged), and then as the document table (or optical system) moves, the light image is scanned and projected, and at the same time, the charge is removed by a recharger with alternating current (or direct current with the opposite polarity to the pre-charger), resulting in the brightness and darkness of the light image. An electrostatic latent image is formed according to the Further, the latent image is entirely exposed to light to form a high-contrast electrostatic latent image, which is then made visible 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, the developer such as colored particles remaining on the surface of the transferred photosensitive drum is removed by a cleaning blade, and the residual 'dh load is removed by a lamp and a corona discharger, making it possible to repeat the use of 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 the process sequence described above, but TTL has a small noise margin and is extremely susceptible to noise. This is particularly noticeable in equipment that uses high pressure, such as copying 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.

Moreover, an additional circuit configuration is required to reduce unnecessary operations and operate the process processing means at appropriate timings according to the copy size.

Control circuits made up of hardwired logic circuits, etc., which are said to be 1φ in history, have the disadvantage that many elements are required due to the complicated control circuit configuration, which increases costs and makes it difficult to easily change sequence control. It was something.

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, JA, M detection malfunction is fatal, and it takes a lot of time to design and consider circuits to prevent this.

Furthermore, when performing copying machine maintenance or assembly, you can check the machine's operation without paper feeding, or perform heat running (
test), kill the TAM detection circuit,
The paper presence/absence detection circuit must be killed or T
In a control device such as a TL, since each detection circuit is independent, the operation thereof is complicated. In addition, when creating various long and short time timer circuits that are absolutely necessary for controlling copying machines, separate circuits are required.
VCJ: Making a timer was expensive.

The present invention provides an image forming apparatus that eliminates the drawbacks described below.The present invention also provides a copying apparatus using a liquid development transfer system that can always obtain good images. , the present invention provides an image forming apparatus that can efficiently use an endless photoreceptor and obtain stable and good images.The present invention also provides an image forming apparatus that performs appropriate timing processing of a sequence according to the size of the formed image. The present invention also provides an image forming apparatus that appropriately performs jam determination according to the size and number of images to be formed. 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, and a means for generating a plurality of reference signals such as the reverse position of the scanning means. and a control means CPU which performs sequence control of the process processing load based on the contents of a memory such as a ROM which inputs the reference signal and stores 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'U to perform appropriate timing processing for tjjJ 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 be a two-layer photoreceptor 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, if left unattended after copying, toner may be deposited on the contact area between the cleaning blade and the photoreceptor. In this case, it may be necessary to clean the copy cycle prior to copying.

(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 with a conventional edged photoreceptor, the stopping position is always fixed, so the effects of corona charging will accumulate in the same area, and the drum cleaner will Since the photoreceptor is pressed against the drum with a large amount of pressure, it is inevitable that the same portion of the photoreceptor will undergo physical deformation. 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 without a wife for a long time, and the length of the photoreceptor contributes to its life.

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 10 is turned on, it takes a short time to reset the digital control circuit and start up other electrical systems (about 4 seconds here), and then rotates the photosensitive drum 15, which will be described later. A clock pulse generation mechanism is provided in a part of the drive system to generate 16 clock pulses. Therefore, this photosensitive drum 15
When the starts rotating, first 16 clock pulses (from then on 16 clock pulses are applied)
(written as CPetc) minute, the drum is 1 @ rotation or almost 1
Rotate. This can be considered a stage before starting the copying process.
This is to make a high-quality copy when the copying process begins, and may be omitted. Now turn on copy button 13
If you select , the copying process will begin.

First, when the copy button 13 is turned on, the photosensitive drum 15 rotates by the amount of 1.6 CP plus 3 CP, and then the document table 2 starts placing the document on the document table glass 5 and is illuminated by the illumination lamp 16. , the image is formed on the drum 15 at the exposure section 19 by the reflecting mirror 17 and the in-mirror lens 18 .

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 charged + by the corona current from . 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 in which a developing solution 25 is placed, a pump 27 that stirs the developing solution and pushes it up to the developing electrode section, a developing electrode 28, and, if there is a fog on the image developed on the drum, the fog is removed. 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 caused by the developer being pushed up onto the developing electrode 28 by the pump 27. 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 generated by the high voltage from the high power source 20.
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 begins to move only after the drum has rotated for 0P and the drum has rotated for 1GCP + 3CP, this machine uses an endless type 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 3CP, which is because there are 10 charging steps before the slit exposure in the copying process mentioned earlier, and the cleaner edge part mentioned above is added to the first copy. This process is based on the idea that avoiding this will make the machine more reliable.

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 two most transfer sheets in the cassette 6, and by movement with the separating claw 39, one sheet of the transfer sheet 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 according to 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 a loss time during copying, so it is short.・1f
is desirable. In this machine, the return speed is approximately four times the forward speed to increase copying efficiency.

Since the return speed is high as described above, it is easy to cause a shock when stopping, but in this machine, the shock is absorbed by the brake mechanism and the document table 2 is quickly stopped at a predetermined position. The copy button 13 can also be used when making multiple copies of the same document in succession.
This can be easily done using a counting device (not shown) linked to the

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, even if the copy size is different.
, the number of copies per unit time is small and the time loss is large. 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. The difference in cycles depending on the copy size as described above is 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 turned on and left closed after all copying operations are completed, the photosensitive drum 15 will constantly rotate, and if the high power source is turned on, this is not desirable 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, the main switch 1° 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.
If you press , everything returns to the previous state, the drum rotates, and the document table 2 begins to move forward after QCP. When the copy button 13 is pressed during this pause, the high voltage power supply 20 is turned on and the photoreceptor 15 starts rotating.

Before pressing the copy button 13, the photoconductor] 5 has A,
It is maintained at a uniform potential by a C static eliminator 22. When the next copy button 13 is pressed and the transfer charger 31 is inserted into A8 and the photoreceptor 15 starts rotating, the area between the - charger 30 and the transfer charger 31 is charged →-. , - After the charger, the potential is neutralized by ten zones 'rli Z 31. Therefore, with the vicinity of the charger 30 as the border, the photoreceptor 1
5''D has an extreme potential difference, and the presence of this area on image formation has an adverse effect on the image.

This area from the AC static eliminator 22 where image formation begins
Converting the distance to 630 to the number of clocks, the number of clocks that do not affect the image is 9CP.

FIG. 4 shows the drive system and signal generator.

At the two ends of the rear frame 50, members 73 and 74 for attaching the control signal magnetic sensing elements 48, 71 and 72 are fixed. (Figures 2 and 3) Guide rail mounting base 73
．． 74 has a magnetic detection element 48A, 71, 72.48
B and 48C are fixed, and control signals are sequentially outputted by magnets 161 and 162 attached to the document table 2. 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. Further, the document table moves forward, and the exposure of each copy size (B5, A4.
When it reaches above 80, a reversal command is issued, and the document table 2 moves from forward movement to backward movement.

As the backward motion progresses and the magnet 162 reaches the element 72, the document table 2 is stopped at a predetermined position in response to a stop command. The size switching command is issued by the cassette 6. The clock pulse generation mechanism has a gear 113 integrally fixed to a sprocket wheel 112 driven by a chain 86 from a sprocket wheel 85 attached to the main motor M1. The gear 113 meshes with a gear 115 fixed to an arm 114 holding one clock pulse generation magnet 163, rotates the magnet, and connects the main magnet to a magnetic sensing element 164 fixed to the rear frame 50. Clock pulses are generated at constant intervals in synchronization with the rotation of the motor M1.

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

In the copying machine of this embodiment, the transfer paper is
The printer is equipped with a jam detection means to check whether the paper has completed separation and fixing and been ejected from the machine within a predetermined time. The system is designed to stop the machine if it is not ejected outside the machine to prevent accidents such as fire. The method of detecting the presence or absence of a transfer sheet is to push up a JAM detection roller 180 installed coaxially with the paper ejection roller when the transfer paper passes the fixing heater 124 and reaches the paper ejection roller 46. Then lever 1
81 is pushed to the upper left, and the magnet 130 attached to the tip of the lever 181 is also pushed and moved away from the fixed magnetic sensing element 129, producing 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 usually held in place by a locking mechanism 133, and is rotated around the shaft 132 by removing the locking mechanism after opening the top cover 127. It rotates clockwise, and the transfer paper path after the register rollers 41 and 42 is opened.
Jammed transfer paper can be easily removed by hand. At this time, the separation belt 32 separates from the photosensitive drum 15, so that it is easy to remove the transfer paper jammed in the separation section.

After removing the jammed transfer paper, perform a jam release operation and close the upper cover 1.27, thereby returning the entire machine to its original state.

Next, a method of attaching the cassette 6 to the main body 1 will be described. The Ube 145 of the cassette 6 is placed on the cassette stand 1, 44-f2 fixed to the machine body. A roller 148 is provided so that when the cassette is pushed into the machine body, the protrusion 146 at the bottom of the cassette comes into contact with the positioning plate 147 of the cassette stand. spring 149
As a result, the cassette 6 is pressed into a predetermined position.

At this time, the cam 150 and the cassette installed on the side wall of the cassette; the microswitches 1.51 installed on the 6 units 144
(MSI) 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 II+T2. I4.
, I8 receives signals from the aforementioned magnetic sensing elements, microswitches, etc. as input signal groups. 0
Signals for driving pulse transformers, small lamps, solenoids, electromagnetic clutches, etc. are output from output groups 1 to O8.

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 passed through the original input signal group, which input signal is used as a probe signal and input to the matrix circuit (FIG. 15), and the microcomputer reads one signal taken out from I1 to 18. 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.

Figure 7 shows the TEXAS microcomputer r'M.
It is an internal circuit block diagram of s-1000. Among them, DingLOM is a read-only device that stores the sequence contents of Figures 11 and 12, which will be described later, in a code in advance, and stores them in each address.The contents can be retrieved each time an address is set. It is memory.

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

T(A, M is a read/write memory that temporarily stores data, etc. during program execution, and is a memory that stores a set of binary codes.The details are shown in Figure 8, and each bit is composed of a flip-flop. A set is selected by an address designation signal, and data is written to or read from multiple flip-flops within the set.The address in the RAM at which information is stored is specified by the X register and Y register. In addition, the CPU has AI, U, and RO functions that decode input data and process data.
A program counter PC for specifying the address of an instruction stored in M, and page address registers P and A- for specifying a page address group of instructions stored in ROM.

Page buffer PB for changing the ROM page, a subroutine is called, execution of the subroutine is completed,
Subroutine return register SR for storing the original return address, accumulator A for temporarily storing the ID operation result for decoding instructions stored in ROM
R, etc. Input terminals I,, I2.
I,, I8 is connected to K, INPUT, output terminal 0
1 to O1, are connected to O,ROVTP'VT.

To give a general explanation, 11. The sequence was programmed from the cPU. Specify the OM address, the contents of the specified address are read into the CPU through the data line, and the CPU
decodes this and, according to the decoded contents, processes the data in chronological order starting from power-on, sometimes within the CPU itself, and sometimes processes the data in the CPU to a specified location in RA, M. address, input data at a specified address in I'iLAM into the CPU, sometimes output data in the CPU to the output signal line of the output section, or input signal line of the input section. Sequence control is performed by inputting information into the CPU.

'The basic timing for program processing of TMSxooo is shown in FIG.

A several μsec clock 96 (from the osc in FIG. 8) 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 address 0M, and at the same time, the program counter PC is incremented by 1, and R
It takes one clock to decode one program instruction in ,OM, and one clock to write to R,AM, totaling 6
Complete one command with a clock. The programmed instructions following the above address are executed at similar time intervals.

(Input Code) The number of status signals input from the copying machine is large, and the number of input ports of the computer (1) is not equal to 4 bits, so the matrix circuit shown in FIG. 15 is provided as a converter. Table 1 shows the relationship between probe terminals θ1-3 and input ports 11-18.

Table 1 CL K P is a clock pulse (generated in synchronization with the photoconductor), PEP is a paper out signal, LEP is a liquid out signal, C
3TP is the copy button, CI38P is the original platen home position, TSC is the toner supply command, FDP is the paper detection signal (transfer paper), B5゜A4, B, iBP is the original platen reversal signal for each paper size, MSI, MS2 is the micro Switch (for paper size detection) '1 JAMKFiJAM undetectable signal.

Incidentally, there is one input (1) for inputting the drum clock CLKP and the idle time signal LDEN (described later).

In Table 1, the status from the input signal group changes every moment,
The computer is set to 01°θ2 at the time you want to read. A probe signal is output to any of θ3 (these θ1, θ2, .
θ3 signals are not output at the same time) The desired state signal is 4
Read with b it (l1lI211, , I8 parallel) and determine which l) it content 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, 31.0, 311, 313, and 314 are Nant gates, 309 is an inverter, and 312 is an A agate. 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' becomes O level. On the other hand, NAND300 4
', the probe signal θ from the microcomputer in Figure 6
1 enters. This PEP signal sets θ1 and I2
It will be read from the input terminal of. Reading of other input signals follows Table 1.

In the control flow, reading paper, etc. is performed at 5TEP in Figure 11.
This 5TEP8 is executed in SUB2P of 8.
When the program progresses, the command is such that a level is set in θ1 every time 5UB2P is passed, and θ1 is immediately reset to O level when reading is completed. The time it takes from setting θ1 to completing reading is approximately 60 minutes.
μseC.

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

121J, now that θ1 is set, input 4' of NAND300 in Figure 15 becomes 0 level, and :Ioo
The 111 force of is 1. The output of NAND308 becomes 0 level. This is because the human power of 308 r ton, that is, the output of 303 and the output of 307, is a level because θ2°03 is not set.

The output 24' line of this 308 is input to the microcomputer shown in FIG. 6 and read by the 5UBLP program. The read data is stored at address 0 nrTt (hereinafter referred to as (0, 1)) of the Y register in the RA and M areas shown in FIG. SUB LP determines whether BITI is 0 or 1, and when it is 0, sends a paper out signal to θ13 in Figure 6 and 1.
．． and output it. When the label is output as shown in FIG. 16 34', the buffer inverter 432 is turned on, the output of the buffer inverter 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 Figure 15 is in lebel, so the output of 30° is 0 and bevel because θ1 is read in lebel, and the output of 308 is in lebel, BIT+ of the RAM in FIG. 8 becomes Lebel.

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

In each program step, the data of other input groups are read and judged in the same way, but the input group signals and logic gate 310 of the matrix circuit in FIG.
P, CB I-I P, BP signal 0J3
11 is If, EP, TSC', MSI signal 0J313
CS'l'P, PDP, MS2゜JAM
The OR of the K signal is supplied to the CPU.

The feature of the IJ sock path embodiment is that the document platen reversal signal for each size and size, that is, B5. A, ,i,B
4 is input to the OR circuit, and ma(On the IJ wax, only one inverted position ir5 signal is provided.

Normally, the number of human 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 the number of probe signals is 3.
Only books can be used.

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 composed of resistor 401, resistor 406, capacitor 403, and capacitor 404 is a 5 KHz oscillator. This oscillator uses a triac (not shown) in order to drive an AC load such as a main motor, and a pulse transformer is used for this triac. This is an oscillator that drives the triac through a pulse transformer. Therefore A, ND Agate 409, 410
, 411, 412, 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 input 31' of the AND) 408 is a developing unit motor signal, which outputs a level from when the power is turned on until post-processing starts. Therefore, these AND signals output a level for 4 seconds from the time the power is turned on. 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, the reference numeral 27 becomes a level bell when the document table moves forward. Therefore, AND4t5 outputs a paper feed signal only when the document platen moves forward), and I, i+, and when the stacking platen moves backward at 37, it is at the same position as when forwarding (, + is manually input, but 27 is 0 at that time). Since the level is set, the level is not output to the AND415.

- The f inverters 416 to 429 are Darlington type transistors for driving the load, and drive the load with the input signal.

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 (AI?iXP).

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

418 is AC static eliminator (HVAC) To the main motor (DR.MD).

419 is the document platen advance motor (CBFW).

420 is for I reverse motor (CBRV).

421 is a ten-form charger, a -charger, a ten-transfer charger (HV
T)C), Original exposure lamp (IEXP) 422 is replaced with blank exposure lamp (BT8XP).

423 is for developing device-F:-ta (DVD).

424 is the power hold relay (Pl-(CD)).

425 is paper feed clutch, paper feed counter (PESD/CNTD) 426 is the toner empty indicator lamp (Tlj″lIj).

427 is on paper (r’gr,).

428 is liquid (T, EL).

429 is the JAM indicator lamp (JAMT,).

Connected.

The paper feed clutch is used to lower the rotating paper feed roller 4O onto the paper when the main switch is turned on, and the power hold relay is used to lower the rotating paper feed roller 4O onto the paper when the main switch is turned on.
This turns on the LD. Also, blank exposure is the first
3. As shown in the time chart in Figure 14, the exposure lamp (
IEXP), the lighting is almost the opposite of that of IEXP), and the difference in the surface potential of the photoreceptor is eliminated. The paper feed counter counts the number of copies that have been completed, and compares each CNTD signal with the set number of copies every ten signals, and outputs a copy end signal (turns off the copy button) when the number of copies is the same. Figures 13 and 14 show time charts of input signals and output loads. Since it is clear from the figure, the explanation will be omitted.

Figure 10 shows a sequence control system flowchart.
A detailed flowchart of the furnace is shown in FIGS. 11 and 12. FIG. 10 clearly shows the outline of the process from power-on to execution of the program 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, the charger can be left in operation during pre-treatment and post-treatment to reduce non-uniform 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 ( PU-n, 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 300K,
It is set to tLz. That is, the time of one clock is T=1. /f (seconds), it becomes about 33 [μ5eC],
With 6 clocks, it becomes about 20 [μSeC]. Therefore, since it takes 20 [μ5ec] 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 R, AM area child addresses 115.2, 15.3, and 15.4, and the number 15 in RAM area 1 is first subtracted until it becomes 0. Repeat. If it becomes 0, T(, A, M
Subtract 1 from 15 in area 2 to get 14. Next, enter 15 again into the 1% A, M area 1, which is 0. So again 11. A, M area 1 subtraction is O
Repeat until.

Each time it becomes 0, subtract 1 from the contents of TLAM area 2,
Every time the R, AM2 area becomes 0, subtract 1 from the rLAM3 area, and from then on, the R, A M areas 1, 2, 3°4 are all 0.
Repeat until. The number of instructions during this period was approximately 200,000
The number of RA and M areas, ifi, is determined so that the number of RA and M areas is equal to one. Note that, in addition to this embodiment, a method for realizing this 4-second timer is shown in FIG.

The system shown in Figure 20-1 is an oscillator FA"lrr that oscillates a signal υ" at intervals of 1 second, for example. A certain output signal of the microcomputer is used to read the oscillator signal into the microcomputer. If we use it as an oscillator, the microcomputer only needs to count four times,
The number of program steps can be extremely reduced. Further, the method shown in FIG. 20-2 is a method of counting clocks generated in synchronization with the photoconductor when the frequency thereof 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, if this copier is left unused for a long period of time, toner particles tend to stick to the cleaning blade, so if the copier 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 2J-2 shows a time chart. The circuit configuration is CR.

It consists of a timer circuit, reset circuit, delay circuit, comparison circuit, and driver circuit.

To explain the operation, when this copier is in operation, the main switch (S
Since W) is ON, the capacitor of the C timer is being charged via DC 24V. If the charging time is 30 seconds or more, it will charge up.
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 inputting a potential below a predetermined level, turns on the output transistor for a period of time determined by a delay circuit (approximately 10 seconds), and outputs the long-term whistle signal T and DEN signal.

When the delay time ends, the reset circuit works and starts charging the capacitor again. On the other hand, if the standing time is less than 7 hours, the capacitor potential is above the predetermined level, so the comparator does not operate.
The output transistor starts charging the capacitor again in the OFF state. The setting time is determined by the capacitance of the capacitor.

After turning on the power, first, ST and E P1 are executed in the above-described manner, 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 step 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, in this case, the JA and M detection circuits must be made inoperable.
The JAM 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 has been inputted completely. Therefore, the output of NAND314 is 4
It becomes 0 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 there is no probe signal from 3. Then N
The output of AND311 becomes 0 level.

5TEP3 reads this 0 level. As will be described later, the information read in this 5TEP3 is stored in the RAM and
This is used when determining whether the transfer paper has arrived at TEP'38 in FIG. Next, proceed to 5TEP4 to determine whether the 4-second timer mentioned above has timed up, and when the time is up, proceed to 5TEP5.
Then, the load of the main motor etc. is turned on.

In 5TEI'6, the LDE N signal is output for about 90 seconds after the power is turned on by the above-mentioned leaving time measuring circuit shown in Fig. 21, so the computer reads the LDEN signal 4 seconds after the power is turned on. , A, M 1
At this time, the photoreceptor is not rotating yet, so CT and KP are not manually operated.

Furthermore, after the 4-second timer ends, the AND201 PU 1”t
Since the S signal becomes the O level, even if the level of the LDEN signal is input, the output of the A, N D 201 is 0 level, so the output of the gate 202 is 0 I (the output of the gate 202 is a clock pulse generated in synchronization with the photosensitive drum. Only the CLK and P signals are input to the computer.

After the 14-second timer ends, the content of the data read in 5TEP6 is judged with S'l['EP7, and if the left time is over 7 hours, the drum is further rotated with 5TEP8.9 and pretreatment is performed for 40 seconds. . During this time, only the load that was turned ON at 5TT8Ps is being driven. If the leaving time is less than 7 hours, the preprocessing 40 second timer will not operate and the 5T
Move to FiP10. Here, while the 40 second timer is not up, subroutine 5UBCBII, V
, SUB LP, SUB 5IZE.

This SUB CBR, V, SUB LP, 5UBSIZ
While the 40-second timer is running, E always 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 through. This is a routine for

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

The 40 second timer is a clock pulse (CLKP) that is generated in synchronization with the photoreceptor mentioned above (about 05 seconds during operation).
This is done by counting 80 clocks. After 40 seconds of processing, CT at 5TEP10, 1.1,
Count 10 KP. As mentioned above, this copying machine performs one revolution of preprocessing regardless of whether or not preprocessing is performed for 40 seconds. If the 40-second pre-processing is performed, the pre-processing is performed once after this, and if the 40-second pre-processing is not performed, the pre-processing is performed once after the PU RS ends. At 5TEPII, it is determined whether 10 CLKPs have been counted.

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 5TEPlO and s'rEp11. In Fig. 17, 5TEP10-1 opens 10 clocks, mL, STE Plo-2 starts clock reading, and four clock signals CI,'K
P is level, 0 level is judgedffl. CT now,
When K P is level, the process proceeds to STEP 10-4, and it is determined whether the document table is at the normal position (home position) before scanning. If it is not in the normal position, a document table back motor ON signal (output θ6 in FIG. 8) is output. Furthermore, it determines the paper size, monitors the loading of the cassette, and determines the presence or absence of liquid and displays a notification. When CLKP reaches 0 level, the process proceeds to 5TEPI O-7 and 5TEPI lo-8 and the same process is repeated. CL J (If P becomes a rubel again, it means that 1 clock has been counted, so repeat this and count 10 clocks with 5TEP1o-12. How will you judge?

While counting the above 10 clocks, 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 CLKP. This method is particularly effective when it is necessary to perform other tasks while counting the clock, such as when it is necessary to detect when the document table moves out of its home position. In other words, even if the document table is reversed by the reverse position signal, the home position is detected, and the document table back motor is turned off, the document table still protrudes from the home position (because the user of this machine touched the document table). Sometimes.

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 will back up when the clock is at the 0 level. An attempt is made to return the document table to the stop position by turning on the motor, 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 CI and K P l O counts are completed, 5TEP12 is executed to check whether the copy button is pressed. If the copy button is not pressed, preprocessing 1
s"rE'r to count the remaining 6 clocks of rotation.
13.5 Run TEPI 4. If the copy button has been pressed, the process advances to S T T8 P21 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 Step 5.

Then, the process moves to the post-processing step (2) described above.

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

Is the main switch OII during this post-processing? It generates a power hold signal that maintains the power supply to the control circuit even if the power is turned on.

Even during post-processing, 5TFiP16 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 5TBP21. When the post-processing is completed, the copying machine goes into standby mode. This is why all loads are turned off in 5TEP l9.

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 process advances to 5TEj21, where the load shown at 5TEP21 is turned on and the drum rotates.

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. 5TE when checking B5BP at 5TEP26
At P27, the SUB T S L routine is executed 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 to be described later. Next S T EP 2'
In the paper size determination routine No. 8, 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.

5TFiP28 determines the paper size, sets the size flag in R and AM, and prints B5. A4. The process branches to one of the flows related to B4 size (FIG. 12). It is recommended that the drum surface be cleaned by rotating the drum for 9 clocks or more after pressing the copy button.

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 Hall element are detected, and for the 4 size 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'rEPs4, 85.86). and 5T
When it is determined by EP87 that the document table has reached the reverse position of B4, the document table advance signal CBFW and the blanking lamp BEXP are turned off and the backward movement signal CBRV is outputted by 5TEP88.

Next, 5TEP89 is the accumulated jam detection routine PDPI, and when the document table reaches the reverse position of B4, the paper detector 18
o (Fig. 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, the accumulation is notified, and the next paper is sent. to stop. This is effective during continuous copying.

If the paper is not retained, the 5TFiP90 determines whether the original table has returned to the home position, and when it has returned, the document table stops moving backward (STEP, 91), and proceeds to a paper delay jam determination routine PDP2 (STEP 92).

Note that subroutine TSSD is executed between determining B4BP and the original platen stop position. Conor routine is 5TEP
It is reset when the developer concentration is restored when R, AM and STgP87°90 are executed in the TSL routine of No.27.

Also, the JAM detection PDP2 routine in STI', P92 is a delayed JAM detection, and since it has been determined in 5TEP89 that the previous sheet is not stuck, this time it detects the transferred paper that is currently being transferred and is about to be ejected. Detects when paper is jammed inside the machine or is not fed due to a paper feeding error. i.e. 5TEP
If the transfer paper has not reached the JAM detector at time 92, a delay 11 message is issued and the next paper feed is stopped or the machine is stopped. If 5TEP92 determines that it is not jammed, proceed to 5TEP93 and check the copy button to copy one sheet.
Determine whether multiple copies are being made. If one copy of gold plate is used, 7
Execute 5TEP94.5TEP95 to increase the number of words of the clock. This is a program that prepares the timing for entering post-processing 5TEP■. Since relatively short paper such as B5 size paper is ejected earlier than B4 paper, etc., it enters post-processing in less than 7 clocks. 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.

5TET'96 performs a determination that there is no replenishment toner.

The routine T ET. This judgment is made by setting the flag set in 5TEP27 when the developer concentration is low at the back position of B5 in 5TEP87゜5TFT''90 etc. (DSUB TSST).

If the concentration of the developer is too low to reset, the concentration is determined again just before starting post-processing, and if the developer is low, a toner empty message is issued.

B5: Since the time from the cook position to the start of post-processing is long, even if the developer concentration is low, if there is replenishment toner, the concentration will be restored to the specified level immediately after being captured. The input signals TS and C at this time become a signal that the toner is thin for a long time, that is, a signal that there is no replenishment toner.

This is explained by i'iY=L,
1 and flowchart 1 in FIG. 19-2. Figure 19-2 shows the 115 size. No. 19-11'! In I, 50] is a circuit for determining the concentration of the developer, and if the concentration of the developer is low, the output of 501 becomes Lebel. On the other hand, the toner image zero period is the period from when the document table moves forward until the end of post-processing. If there is no section where toner can be supplied, for example, turn the main switch OFF.
If N, 01"Ti' is repeated, there is a possibility that a concentration of 1i will be produced each time.The reason is that the liquid concentration is determined by irradiating the liquid passing through the slit with a lamp, and
The element f receives this and detects it by a change in the resistance value of the light receiving element. In this case, when the main switch is turned on, the developer motor begins to rotate and the lamp lights up before the liquid flows into the slit. This is equivalent to the fact that the resistance of the light receiving element is small and the concentration of the liquid is low, and the toner is supply it. Therefore, 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 current concentration is low and the output of 501 is 1, the signal TSC is short-circuited to ground because transistor 506 is turned on. This is because θ7 is at the 0 level according to the signal from the microcomputer, so the output of the inverter 50B becomes 1, and the transistor 506 is turned on.

On the other hand, when the document table moves forward at 5TEP25-1,
At the next 5TEP, a toner replenishment enable signal is output. Therefore, for the first time at this time, the output of the innocoutor 508 becomes O level, the transistor 506 becomes OFF'F, the output signal from the operational amplifier 501 is supplied to the transistor 502, and the toner supply solenoid 503 is activated.

However, if there is no toner, the output of the arithmetic multiplier 501 is 1, and the output of the inverter 505 is 0, and the information that the toner is thin is read into the microcomputer through the matrix circuit. That is, the toner flag 17 is memorized in the I'tAM area in the TSL routine of 5TEP27, and the flag is not reset in the TSSD routine of 5TEP:30 and 41.
Immediately before starting post-processing, the 11. The setting of the flag in the AM area is determined to indicate that there is no toner.

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 it is determined in 5TEP93 that the copy button is still pressed, Figure 11 ◎
Then, turn on the document table advance signal again and repeat the same process.

Up to this point, we have explained the +34 size sequence, but the same applies to other B5 and A4 sizes.
The only difference is the detection method, so the description will be omitted.

The JAM detection method will be specifically explained with reference to FIG. B
In the case of size 5 (Figure 18-1), first the 1 document table reaches the home position at 5TEPao, then proceed to the routine shown in Figure 12 (■), the clock is counted 5, and 5TEP45 is reached.
If the transfer paper is present at the paper detector 1 s o j:, but it is determined that the previous sheet is not retained, the 5TEP 48 counts another 4 clocks and determines whether the transfer paper has reached the paper detector 180 or not. If it has reached the signal, the signal from the Hall element 129 is an o bell as shown in FIG. 23(C). (Transfer paper delay) If the paper arrives at 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 close to each other. Furthermore, Figure 18-3 (B5 like C1)
When a large number of sheets are to be copied continuously, the delay is determined by 85 BP and the clock for the last copy is reached.

Further, in this example, T'15. In the case of A4 size, a clock is used to detect JAM, but it is also possible to use a frequency-divided clock φ for driving the microcomputer or an external low-frequency oscillator.

In the method of disabling these JAM detection operations, in this embodiment, CP 1 (JAMK) in Figure 8 is shorted to ground, but information such as the number of copies is electrically input from the outside. This can be done using the numeric keypad. In other words, the input signals for JAM killing, liquid killing signal LEP are ignored, paper killing, J, AM killing, liquid killing, and paper killing signal PEP are ignored.
Enter data using the numeric keypad (Fig. 11 S T E
B4), 7 lags are placed at specific addresses in the TI and AM areas, and a step is provided in advance to jump to this step immediately before the jam detection, liquid, and paper discrimination steps during programming. When the program is executed at a step, the corresponding killing data storage address of R and AM is read and it is determined whether the flag is 1 or 0. When it is O, it advances to each determination step, and when it is 1, it jumps to the determination step and moves to the next step. Then proceed to the sequence step.

Further, in the present invention, even if the magnetic detection elements such as B5, A, and 4 are damaged, the document table is automatically returned to the longest paper size.

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, regardless of the paper size, the time from when the document table moves forward to the document table inversion position for the longest paper size is fixed, so the timer for this fixed time is set by CT,
Make by counting KP. Therefore, as described above, since the paper size flag is stored in memory, if a predetermined reversal signal (at the time when a predetermined CLKP is counted) is not outputted for a predetermined paper size, the document table is automatically inverted. This timer counts the aforementioned CLKP, uses an external low frequency generator, or uses a frequency obtained by dividing the clock φ of the microcomputer driver j.

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

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 finished, the post-processing is executed to the end and then the drum rotation and load energization are stopped. A control step is provided to issue a power hold signal. This copying machine includes a power transformer for supplying DC to the control circuit and other DC loads. A 24V rectifier circuit is used on the secondary side of this power transformer, but a very large capacitor (for example, 2200 μF) is inserted in the smoothing circuit of this rectifier circuit. -In case there is a line where AClooV is supplied by the main switch for turning on and off this power transformer, on the primary side,
Even if the main switch is turned OFF during post-processing, A, C1
There is a line to which 00V is supplied.

Is the main switch 01 during this post-processing? AC even if it becomes F
The signal that drives this circuit so that l, OOV is supplied is the power hold P HL D 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, if the main switch is turned OFF during post-processing and the power hold signal is output, and the power hold signal is 0FFI after post-processing, the primary side of the power transformer will be OFF.
Therefore, the rectifier circuit on the secondary side of the power transformer also becomes OJi"F. However, since the capacity of the smoothing capacitor in the flat t1" circuit is large, the discharge time is long (approximately several hundred m5e).
c).

Moreover, the microcomputer's power supply voltage has a sufficient operating range. 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 rt
AM, ROM, etc. start to operate. At this time, R, AM
When the power hold signal is output by the ROM output, the main switch turns OFF l, and the AC 100V line mentioned above becomes active again even though the post-rotation has ended.

In this case, of course, other It, A of the microcomputer
The values in the Mfr1 range are also incorrect, causing display lamps such as the JAM display lamp to light up, 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 resistor, and 607 is an NPN transistor.
PN ) transistor, 606 is a transistor collector resistance, 608 is a voltage drop resistor, 611 is a 1.6 V Zener diode, 610 is a silicon diode, and 609 is a control transistor.

To explain the operation, resistor 608, l.
, and the Zener diode 611 is a well-known constant voltage circuit, so its explanation will be omitted. The Zener voltage of the Jener diode 602 is about 20V, and the base current is supplied to the transistor 605 through the resistor 601. If +24V is now input to this circuit (
During post-processing (the input is connected to a circuit that smoothes the transformer output, and the 1.5 V output is connected to the computer power supply terminal), a Chena current flows through the Chena diode 602.
The transistor 605 is in a conductive state, current flows through the resistor 604, 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, the transistor 607 is in a non-conductive state. Therefore, the Zener current supplied to the resistor 611 does not flow through the resistor 606, the Zener voltage of 16V is maintained across both ends of the Chena diode 612, and the 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 the +24
．． The V power supply also gradually decreases.

When the +24 V voltage reaches around 20 V, the Zener diode 602 becomes non-conductive, and the transistor 605
is in a non-conducting state, the transistor 607 is in a conducting state,
The collector of the transistor 607 is at approximately Ov potential,
No Chena current flows through 611, 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 +I.

In this way, when the +24V voltage becomes 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 BRLBDDDpAcg
.

MNEZ LBCCCBL LBGGGBRLBAA
LBDDD 4CY 4DYN TCMIY 3 MAN TAN LBHHI(CALLL 5UBSIZENE
Z ORLBBB C:ALLL 5UBLPYN DMAN CALLL 5UBCC:MDTAM MN
EZ MNEZ Il! RLB997 BRLBCCBRLB99El LB997 BL LB34 LLBDD LBAA IYc LB998 CALLL 5UBC
BRVBL LB5 CALLL 5UBCNTLBB
B IYCTCY 4 MAN BL LB4 TAM l, 8cc IYC NEZ BRLBHHH LLB3 LBAAA CALLL 5UBCNT BL LBB
BBTCY 4 PAGE 1 Kaihachi N TCY 2 TAN SETR MNEZ TKA BRLBCCCR9TR TCY 0 LB300 TCY 3 TAM TCMIY 4 TBITII LBX TCY 15 BRLBA TIJIY O BR 0TCY 3 ETN LBA BL LB25 LB301 TCY 2SU
BSIZE BRLBB' 5ETRLBC: 5ET
RTKA TKA R3TR R5TRTCY 0 TCY 0 TAN TAM Tl3ITl 3 TBITI 2 SRLB303 BRLB301 TCY 3 Till:Y 2 TC:MlY2 SETR' BRLBX TKA LB303 TCY 3 R3TRTCMIY 1 TCY OBRLBX TAN LBB CLA TBIT13 TCY 3 BRLB300 TAN TC:Y I TCY 2 SBIT l BRLBC TMA PAGE 2 TDO5UBPDPI TCY 1 TCY 3 SETR TCMIY OTKA TCY 15 R3TR TCMIYI TOY 0 TCY 3 TAM RETN TBITI 3 SRSUBJAM CALLL 5UBCBRVLBD
RETN TKA LB700 CALL SUBJAM SUBPDP2 BRLBCQ BL LB901LB
CJ 5ETRLBCQ TC:Y 12TKA TB
IT'l 3 R3TRERLBD TCY OTCY 1 TAN SRLBCJ TBIT13 LB7!39 TCY 1BRLBD
5ETR BRSIIBJAM TKA SUBJAM TCY I R5TR 5BI7 3 TCY 0 TMA TA N TDOTBITI 1 TCY 10 BRLB509 SETRTCY 5 LB800 []YN 5ETR RSTRBRSUBJA M YNECe LP509 TCY 5 BRLP800 RSTR TCY 4 BRSUBJAM LB900 R5TRPAGE, 3 DYN 5UBC:NT TKA YNEC0TCY 0 BRLP900 TAN BRLP799 TBITI 0 BR5UBCNT LBTNTI CALLL 5UBSIZE LP50
1 TKATC:Y 0 CALL 5UBLP TAM TBITI 0 BRLBE TAM BRLP501 TBITI 2 SUBTSSD TCY l BRLBESETRLP
600 TCY 14 TKA MNEZ R3TRBRLB801 TCY 0 RETN TAN ' La2O2TCY 1 TBITI 2 5BIT O BRLBLLL TMA BRLBE TDO LBLLL TCY 14 TCY 6TCMIY O
R5TR 5BI7 LBE RETN SUBTSL TCY l PAGE 4SETR5U
BCC:MD TCY 0TKA 5ETR R3TRTKA TCY 0 RSTR TAN TAN TBITI 2 TBITI 3 BRLP500 BRLB401 TCY 14 LP400 TC:Y 2TCNIY
l TCMIY 0 RETN SRLBF LB500 TCY 14 LP401 TC:Y 1
TCMTY OTMA SETRBRLB400 TKA LP402 TCY 2 RSTRTCMIY 1 TCYOLBF DYN RETN CALL 5UBLP LB45 TCY 2 SETRCALL 5UBC:BRVTKA TKA RSTR TCY 0 TCY 0 TAN TAa TBITI 0 TBITI l BRLBCK ORLBMMMM BRLBINT2 BRLBNNN LBCK BL LBRLP LBMMM BL LB4G LB9000 BL LBINTI LBNNN BL LP01 PAGE 5LBP T
CY 2 TCY I+ 5ETROMAN TKA TAM RsTRMNEZ TCY OBRLBJ TAM BRLBK LB988 TBITI 1 BRLP999 LBK CALLLSUB BL L
BFFF BL LB100OLB999 LDP 1
2 5UBCBRV TC:Y 1BRO5ETR 1, B901 TC:Y 0 TKA TAM R5TR 5BITIOTCY O BRLa9O00TAN TBITi 1 LBINT2 CALLL 5UBSIZE BRLB
looTCY 5 SETR' RBITI RETN TMA LBloo TCY 5 TDO R5TRLP203 RETN ETN SUBLP TCY 0 LBJ 'BL LB51S
ETRPAGE Ei KA R3TRLP48 CALL, 5UBTSSDTCY
0 TAM BL 1. B45 TBITI2 LP01 TCY 2 BRLa2O25ETR TCY I TKA SBIT 2 R3TR TMA TCY 0 TDOTAN BRLP201 TBITI] LB200 TCY l Bl'l LB48MA TDOCALLL 5UBTSSD TCY 15 BR' LB47 NEZ BRLBJJJLB48CALLSUBTSLLB2
01 TCY 0 TCY 8 TBITI l 5ETR BRLP202 TCY 4 LBJJJ TCY l R5TR 5BIT l TCY 5 TMA ' 5ETR DO BRLP203 CALL 5IIBPDPILB2
02 TC: Y l LBJ9 TCY 15ETRL
P40 CALL 5UBPDP2TKA TCY
11 R5-choRTCMIY7 TCY 0 TAM LP41 CALL 5UBCNTTBIT
I l TCY ll 5RLI350 DMAN AN CALL 5UBTSSD BRLP49 CALLL 5UBSIZELB50
TCY 5 R3TRCALL 5IJBLP CALL 5tlBPDP2 CALL SUBC
CMDTCY II MNEZ TC to IY7 BRLBM BRLBO LBS1 CALLLStlBSTZE LBOTC:
Y 11NEZ CALLL 5IJBLP BRLB42CALLL
SUBCCMII CALL 5IIB NEZ BRLBL BL LBlooO CALL 5UBCNT LP42 CALL 5
IIBCBRVCALL 5UBTSSD CALL
L 5UBTSSDL[]P 5 BRLB41 BROLP43 TCY '8 5TR LBL BL LP18 TCY 4 PAGE 7 5ETR TCY 6 0 AN SETP TAM TCY 5 BRLB34 STR DMAN LP36 CAL LLSUBPDPITAM
TCY 4 )jNEZ TCMIY 4 BRLP44 LP37 CALL 5UBTSSD CALL 5
UBPDP2 CALL 5UBCNT BL LBP TCY 4 MAN R44CALL 5UBTSSD TAMBRLP
43 MNEZ LB to BL LBU6 BRLB37PAGE 8 LP34 TCY fi CALLl, LSUBPDP2
ETR TCY 5 BL LBP R5TRLP38 TCY 8 TCY 8 5ETR RSTRTCY 8 TCY 4 R9TR 3ETP TCY 5 MNEZ R5TR 25LP35, TCY 4 BRLP38 5ETR NEZ LB 35CALL 5UBC:NT BRLB39B
L LBP CALL 5UBTSSD TCY 4 LP39 CALLSUBCNTCAL
l, L 5UBTSSD TA LBTCY 4 M
NEZ DMAN BRLP33 LB TAM BRLP38 BL LB40 PAGE 9 TCY 5 LP33 CALLLStlBTSS[]
MAN TAM CA1. LL StlBCBRVMNEZ B
RLB32 BRLP30 LB2000 TCY 4NEZ CALLL 5UBPDρ2 BRLBS LEBRL
BT BL LBP LBT CALLL 5UBPDP2 1830 CALL 5UBTSSD CALLL S
UB place BL LB2! ] LE LB31 TCY 5 BL LBlooO1,ETC
MIY 4 LBZ MNEZ BRLBU LP32 CALLLSUBCNT BRLBVCAL
LL 5UBSIZE LBU BL LBI2CAL
LLSUBLP LBV BL LBIOLBI TC
Y 1 CALLSUBCCMD RBIT +TCY 3 BL LBXORETN l, BRTCY 5 DMAN LBQ BL LB43 B1. LP23 LBKKK TCY 1PAGE
10 5ETR? 4 TCY2 TKA SETRR3TR TKA TCY 0 RSTRTAM TCY OTBITII TAN BRLB27 TBITI 1 BRLBKKX BRLP01 LP27 TCY 5 BRLBW R5TR 25CALl, L 5UBSI ZE CALL 5U
BSIZETBITI] BRLBY CAL, LL 5tlBLPBL LP0
1 CALL SUBCCM DNEZ Y CALL SUBTSLBRLB2826 TCY
5 SETRBL LB31 TCY 8 LP28 TCY 5 SETRTCMIY 4 TC:Y 4 RSTRLP29 CALLL 5UBCNTTCY
4 CALL 5UBCNT 5ETR TCY 8 CALL 5UBCNT R9TR LDP 8 CALLl, L 5UBCN BRO ShiBW LDPI CALL 5UBPDρl BR0 PAGE 11 , CA1. l:L SLIBLPCA
LLSUBPDPICALLLSUBCGMDl,B
20 TCY 2 MNEZ SETRBRLB995 TKA BRLB994 5TR TCY OLB995 BL LB38AN TBITI I LB994 CALLL 5UBCB
RVBRLB2+ CALLL 5UBTSSOBL LB2000BRL
B20 LBXOMNEZ BRLBCY LB21 CALLSUBPDP2 BRLBCZB
L LBOOOLBCY BL LB29LB22 B
L LBAAA LBCZ BL LBRPAGE 1
2 LBBBBCALLSUBPDPI TOY 4 CALLL SUBSIZETCMIY
4 TBITI 0 SRLBI7 LB23 CALL 5UBTSSD BL LB2
4CALL 5UBCNT LBI? CALL
5UBTSLTCY 4 LBIII TCY 4 DMAN RSTR TAM TCY 5 ETR CALL 5UBSIZE TCY 8ETR TCY, 1 LBEEE CALLSUBCNTS
ETR DINGCY 8 TKA 5ETR R9TRCALL 5UBTSSD TCYOTCY5 TAM RSTR TBITll 7CY 8 BRLBI8 RSTR TCY 4 CALLL 5UBTSSD ', 5ETRBRLB
III D AN LB18 TCY5' TAN R9TRMNEZ Tl:'/4 BRLBEEE TCMIY 2, LDP I+ R0 LBGGG CALLLSUBTSSD PAGE 1
3LBIOTCY 3 CALLL 5UBSIZE RSTRTCY 4 CALLL 5UBLP RSTR TCY 10 CALLL SUBCCMD LBII RSTRMN
EZ DYN BRLBI9 YNEC5 BRLBII BL LB22 LBI9 TCY 4 CALLSUBCBRV■ AC IA CALLL 5UBSIZE A TAN CALLL 5UBLP CALLL SUBCCMD TCY 8 ETR BL LBZ TI:'Y 8 LB12 TCY II SETR TCMIY9 TCY 5 LB13 TCY 3 R3TR ETR TCY 7 BL LBP LB14 5ETR IYC' LBOOOBL LBIO YNEIII: 10 PAGE +4BRLBI4
TCY 11 TCMIY 8 CALLL 5UBCNchoLB8 CALLL 5UBCBRV CALLL 5UBCBRV CALLL 5UBSIZE CALL 5UBSIZE CALLSUBLP CALLL 5UBLP CALLL 5 UBCCKD CALL 5UBCCND M to EZMNEZ BR
LBθ85 BRLBI5 BRLB984 BL LBlooOLB98S BL LB12LB1
5 TCY 10 0MAN LB984 CALL 5UBCNTTA
N TOY It MNEZ DMAM SRLBI3 7AN LBIfi TCY 4 MNEZ SETRBRLB8 LB100OTCY 7 BRLB3000R3TRT
CY 13 Till:Y 13 'DM8N to CMIY 2 7AN TCY 8 MNEZ R3TRBRLB5000 LB5000 TOY II TCMIY 0 BL LBOOO LB3000 TCY ci PAGE 15R3TR
LDP 15 TCY 10 LDX 0 SETRTCY 10 LBI R3TR CALL 5UBCBRV TCHTY 0YN CALLL 5UBSrZE DYN BRLBI CALLL 5UBLP (:LO TCY 9 CALLL SUB CCMD SETRMNEZ TC
Y? BRLBl]93 LB3 TCMIYIOBRLB9
92 LB4 TCMIYI5LB993TCY 10
LB5 TCMIYI5R3TRTCMIY 15 BL LBI2 CALLL 5UBCBRVTCY
12 LB992 CALLL 5tlBCNT TKATO
Y 11. TAN DMAN TCY 10 TAN LB8 DMAN NEZ TAM MNEZ BL LBII ( BRLB8 END YN MAN AX LDP 0 BR0 1,5DII TOY 11 TC IYIO TCY 3 ETR TCY 7 ETR TCY 8 ETR TCY 8 5TR LB7 BL LBTNTI LBRLP CALLl, 5UBCBRVCALLL
5UBSIZE CALL 5UBLP TCY I+ MAN AN MNEZ BR1, B7 LDP 14 BR0 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 the 11Δ, FIG.
5 is a perspective view showing the cassette, FIG. 6 is a control circuit diagram, FIG. 7 is a block Id of the microcombination unit, and FIG. 8 is a RAM area diagram. , FIG. 9 is a basic time chart of the microcomputer, FIG. 10 is a system flowchart of the operation of the copying machine in FIG. 1, FIG. 11.12 is a detailed flowchart of FIG. Size operation timing chart 1. Figure 14 is B4 size operation timing chart I. Figure 15 is input matrix circuit diagram. Figure 16 is output control circuit diagram. Figure 17 is clock level and θ level control. Flowcharts, Figure 18-1 is a B5 size jam detection flowchart, Figure 18-2 is a B4 size jam detection flowchart, Figure 18-3 is a jam detection timing chart, and Figure 19-1 is ATR flowchart 1.・, Fig. 19-2 shows the ATR circuit, Fig. 20 shows the clock generation diagram, Fig. 21-1 shows the left A11l constant circuit, and Fig. 21-2 shows the operation time chart 1 of Fig. 21-1. 22 shows a power supply circuit, and FIG. 23 shows a circuit example of the input sensor shown in FIG. 6. I4. I[3 is an input terminal to the computer, 01 to 015 is an output terminal f to the computer, A4BP, B4BP, B5BP are document platen reversal position signals, MSr, MS2 are cassette size signals, D
DP is a paper detection signal, TSC is a toner density signal, and TSE is a toner replenishment enable signal. Applicant Canon Co., Ltd. No. 1/Advantage ■■■ Figure 75 Figure 76 躬/8-Figure B5 4 <(1) (bn return 3!! Lotus: fAM, MM (C) αυ <b) (C) No.? /-1 figure man? /-? Illustration procedure amendment (voluntary) 1. Indication of the case 1982 Patent layer No. 112866 2, Name of the invention Image processing device 3, Amending party 1 Relationship with 1 Patent applicant fl Address Canon Co., Ltd., 3-30-2 Shimomaruko, Okawa-ku, Tokyo In page 1 (telephone 758-2111) 5, the specification to be amended 6, the content of the amendment (1), and the claims column of the specification are corrected as shown in the attached sheet. (2), page 4 of the same. Lines 8 to 9 of page 11 are corrected as follows: "In such devices, it is known that the sequence of processes is controlled by a program stored in memory. In this case, the progress of the program J : After one sequence ends, the next sequence is started. For example, if the time until the end of jam detection processing in one sequence is long, if image formation is repeated, the total amount will be reduced by sequence control using a program. The present invention eliminates the above-mentioned disadvantages and provides a process means for image processing, a method for repetitive image formation, and a method for controlling the above-mentioned process means for each cycle. control means for freeing up a memory storing a program for the next cycle, and in order to execute the remainder of the processing in the previous cycle in the next cycle, the processing in the next cycle and the information for that processing are performed between interruptions. It is a feature of 4.'j to cause the above-mentioned process of the previous cycle to be executed. % 2, Name of light I Relationship with image processing device 3, correction person P1 Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (+00
)Representative of Canon Co., Ltd. Ryu Kaku 3 Department 4, Agent address: 3-30-25 Shimomaruko, Ota-ku, Tokyo 148, Date of amendment order October 30, 1980 (Shipping date If11) 6, Amendment order Write the subject specification 1 drawing. (Uchimado t Nitoshi 0,)

Claims (1)

[Claims] means for stopping image processing, means for generating a series of first pulses, means for counting the first pulses, means for generating a series of second pulses, reference signal generating means, control of image processing according to the first pulses; and a control means including a memory storing a program for executing the reference signal,
The image processing apparatus is characterized in that control is performed based on the first pulse, J': distribution two pulses.