JPS60136764A - Image processing device - Google Patents

Abstract

PURPOSE:To prevent a waste of a developer by bringing image formation processing and picture quality processor under the relative control of a computer. CONSTITUTION:The microcomputer controls an image quality control process such as the supply of a developer by a developing device 24 for the cleaning of toner sticking on a photosensitive body 30 during preprocessing, warning display when it is decided that there is not developer, the optical detection of low density of the developer during copying process, the supplementation of toner, etc. Therefore, image quality processing of development control is carried out relatively; with an image forming process in the same sequence with the image forming process based upon the program by the microcomputer to prevent a waste of the developer, thereby forming an image of high quality.

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, which has a photosensitive member consisting of a conductive layer, a photoconductive layer, and an insulating layer, is uniformly charged by a primary charger as the drum rotates. The light image is pre-charged (for example, positively charged), then scanned and projected as the document table (or optical system) moves, and at the same time the charge is removed by a re-charging device using alternating current (or direct current with the opposite polarity to the pre-charging device) to form the optical image. An electrostatic latent image is formed depending on the brightness and darkness of the image. 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. After that, the same polarity as the above toner (for example, if the previous charge is positive, it is my gas)
The revised visible image is made easier to be transferred by the corona discharge, and is then transferred onto plain paper, which is then 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 electric charge is removed by a lamp and a rona 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 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, 11. Many C filters (filters consisting of resistors and capacitors) were used, resulting in a large number of parts and a complex circuit configuration.

Historically, when configuring control circuits, it was necessary to create complex logical formulas, 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.

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 preventive measures such as prevention circuits require a lot of time and effort.

Furthermore, when maintaining or assembling a copying machine, when checking the operation of the machine or performing heat running (test) without paper feeding, it is important to avoid killing the JAM detection circuit or paper presence detection circuit. In the case of a TTL or other type of detection device, each detection circuit is independently set to 1-, so the operation for this purpose is complicated. Furthermore, when creating various long and short time timer circuits that are essential for controlling the copying machine, independent circuits are required on each side, and creating a long time timer at 1'F becomes expensive.

The present invention provides an image forming apparatus that eliminates the following drawbacks.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 produce stable images.The present invention also provides an image forming apparatus that performs appropriate sequence timing processing according to the size of the formed image. Another object of the present invention is to provide an image forming apparatus that appropriately performs jam determination depending on the size and number of images to be formed.The present invention also provides an image forming apparatus that performs stable control by preventing malfunctions of a control computer. 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. The apparatus is characterized by comprising 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 a 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 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 use a two-layer structure without an insulating layer.The Carlson process may be applied as 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 2 to light prior to forming a latent image, the characteristics of the photoreceptor plate will be the same for the first copy and subsequent copies due to the fatigue effect of the photoreceptor.

2) Furthermore, as will be described later, if the toner is left unattended after copying, toner may adhere to the contact area between the cleaning blade and the photoreceptor, 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 stop+lz 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, according to the present invention, by generating an appropriate locking pulse for each rotation of the drum, it is possible to avoid cumulative negative effects such as the one shown in item 071, in which the start position of the drum is shifted every moment when the drum is stopped at the 1st position. It can be used evenly over the entire length of the photoreceptor, contributing to 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 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. 16f
A clock noise generating mechanism is provided in a part of the drive system so as to output a clock pulse of 'il. So this (m
y (, When the drum 15 starts rotating, it first rotates once or almost once for 16 clock pulses (hereinafter referred to as 16CPetc). This can be considered a stage before entering the copying process, and when the copying process starts. This is to make a high-quality copy, and may be omitted.If the copy button 13 is turned on, the copying process will proceed directly.

First, when you turn on copy button 13, the previous 16 CP will be added plus 3.
The sensitive drum 15 rotates by the amount of CP, and then the document table 2 with the document placed on the document table glass 5 starts, is illuminated by the illumination lamp 16, and its image is reflected on the reflection mirror 17.
, the drum 15 is exposed at the exposure section 19 by the in-mirror lens 18.
-1- is imaged.

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 1. Subsequently, when reaching the exposure section 19, the image of the subject illuminated by the illumination lamp 16 is illuminated by the slit Wi onto the photosensitive drum 15-1, as described above. At the same time, A from the high voltage power supply 20
C High voltage is supplied.

AC charging is performed by an AC charger 22. Then, in the next whole-face exposure by the whole-face exposure lamp 23, 1:
A static '1-1f latent image with circular height contrast is formed on the drum surface, and the next developing step is started.

A developing unit 24&'', a container 26 into which a developer 25 is placed, a pump 27 that stirs the developer and pushes it up to the electrode section, a developer, a pole 28, and an image visualized on the drum. In order to remove any fog on the drum, it rotates very close to the drum and one end is grounded.
The electrostatic latent image formed on the photosensitive drum 15 is developed by the toner in the developer 25 pushed up onto the developing electrode 28 by the pump 27 .

Next, the boss), ji) is charged with a high voltage from the high voltage power supply 20 by the electric appliance 30, and removes the excess developer on the photosensitive drum 15 without disturbing the image. Next, the transfer paper 7 fed from the paper feed section comes into close contact with the photosensitive drum 15, and the transfer band ?
The image on the photosensitive drum 15 is transferred onto the transfer 7 by the electric field generated by the high voltage '71L pressure from the high power source 20 in the lj unit 31. After the transfer, the transfer paper 7 is separated by a separation belt 32 and guided to a drying and fixing section 33. The remaining toner developer on the photosensitive drum 15 is wiped off by the edge portion 35 of the blade cleaner 34 that is pressed against it, and the next cycle is repeated again. The developer wiped by the blade cleaner 34 is transferred to the developer 24 through grooves 36 (FIG. 3) provided at both ends of the photosensitive drum 15.
and used again for development.

Here, turn on the main switch 10 mentioned earlier and
The drum rotates by the amount equivalent to C'P, and 16CP + 3C
To explain why the document table 2 starts to move only after the drum has rotated by P minutes, this machine uses an endless type photosensitive drum, and therefore no image can be formed on any surface of the photosensitive drum. It is now possible to contribute to 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 last for a week, for example. This is because in the worst case, the photosensitive drum dries when not in use and becomes stuck to the drum, and in that case, it is necessary to clean the photosensitive drum 17 before forming a latent image.

Next is 3 CP, which is because there are 10 charging steps before slit exposure in the copying process mentioned earlier.
In addition, this process is based on the fact that avoiding the cleaner edge part mentioned above when making the first copy 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 most two transfer paper in the cassette 6, and by movement with the separation 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 registration roller 41 is moved again in time with the leading edge of the image on the photosensitive drum. -42 rotates, and the transfer paper 7 is sent at a speed that matches the circumferential speed of the photosensitive drum 15.

Next, the movement of the document table will be explained. rF! , stacking glass 5
Place the original to be copied on top with the leading edge aligned with the tip A of the glass, press it with the pusher cover 3 (Fig. 1), and press the copy button 13 (Fig. 1), and the drum will start rotating. and starts operating at the same time. 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. Since the time required for this return is loss time during copying, a short value of 11 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 (I-). '+?' which is linked to the copy button 13 also when making multiple copies of the same original in succession. This can be easily done with an I-number device (not shown).

Restarting the document table during continuous copying is done immediately after the document table 2 has stopped at the predetermined horn position. The copying machine of this embodiment is capable of copying various sizes from the maximum B4 size to the minimum B5 size. However, if the document table 2 were to be moved the distance of B4, which is the maximum copy size, the number of copies per unit time would be small and the time loss would be large.Therefore, in this copying machine, the copy size is adjusted to correspond to each copy size, for example, A4. corresponding to Rs.)
It has a plurality of original table reversal signal generating members 48A, B, and C (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 section 2, 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 you leave the power on after all copying operations are completed, the photosensitive drum 15 will always rotate, and if the high rE power is on, the photosensitive drum 15 and blade cleaner 34 may be damaged.
unfavorable in terms of durability. Therefore, in the copying machine of this embodiment, if a certain copying operation is completed and the next copying operation is not performed even after a certain period of time, the drum automatically stops and pauses even if the main switch 1° is ON. It is about to enter the 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 make a copy during this hibernation state, press the copy button 1 on the operation panel 9.
If 3 is pressed, everything returns to the state before the pause, the drum rotates, and the document table 2 starts to move forward after QCP. If the copy button 13 is pressed during this pause, the high voltage power supply 20 is turned on and the photoconductor 1
5 starts rotating.

Before pressing the copy button 13, the photoconductor 15'' is AC.
It is maintained at a uniform potential by a static eliminator 22. When the next copy button 13 is pressed and the transfer charger 30 and transfer charger 31 are inserted, and the photoreceptor 15 begins to rotate, - charger 3 is inserted.
The area between the 0 and 10 transfer chargers 31 is charged to 10, and the potential after the - charger is neutralized by the 10 chargers 31. Therefore, there is an extreme potential difference on the photoreceptor 15 with the vicinity of the charger 30 as a boundary, and if this area enters into image formation mode, it will have an adverse effect on the image.

The distance from the AC charge removal N22 where image formation begins to this area' L unit 30 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.

Members 73 and 74 for attaching control signal magnetic sensing elements 48, 71, and 72 are fixed to the two ends of the rear frame 50. (Figures 2 and 3) Guide rail pick-up stand 73
．． 74 has magnetic detection elements 48A, 71, 72.48B,
48C is 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, B4) is completed, and the magnet 161 moves to the element 48A, 48B, or
When reaching C'2, 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 is the main motor M.

A gear 113 is integrally fixed to a sprocket wheel 112 that is driven from a sprocket wheel 85 attached to the sprocket wheel 112 via a chain 86.
is the arm 1 holding the clock pulse generation magnet 163
The magnetic sensing element 16 is fixed to the rear frame 50 by meshing with the gear 115 fixed to the rear frame 50 and rotating the magnet.
4 and the magnet generate clock pulses at regular intervals synchronized with the rotational speed of the main 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 transfer paper has finished separating and fixing and is ejected from the machine within a predetermined time. The system is designed to stop the machine if it is not discharged and prevent accidents such as fire. The method of detecting the presence or absence of transfer paper is to push the J, A, M detection rollers 180 installed coaxially with the paper ejection roller when the transfer paper passes through the fixing heater 124 and reaches the paper ejection roller 46. ”Nigeru. Then, the lever 181 is pushed upward and to the left, and the magnet 130 attached to the tip of the lever 181 is also pushed up, causing the fixed magnetic detection element 129 to output a speed reduction signal.

When a jam is detected, the fuser heater is turned off and the main motor M is stopped, so the drum 95 is stopped, but the document table 2 is stopped 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, there is nothing left on the hot plate 124, and if a jam occurs in the fixing section, the L cover 124
If you open 7, you can easily remove the transfer paper by hand.

Next, it is rotatably supported by a shaft 132 together with the separation part including the hot plate 124, and is usually held in a fixed position by a locking mechanism 133. By removing the locking mechanism after opening the upper cover 127, the robot can be rotated around the shaft 132. By rotating clockwise, the transfer paper path after the register rollers 41, 42 is opened, and the 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, 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 running part 145 of the cassette is placed and the cassette is pushed into the machine, the protruding part 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 (MS
I), 152 (MS2) outputs 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+r, 1. , I
, input signals from the aforementioned magnetic sensing elements, microswitches, etc. as input signal groups. O3-01
, 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, it is used as a microcomputer probe signal, inputted to the matrix circuit (FIG. 15), and the microcomputer reads one signal taken out from 1 to 18. The microcomputer processes the read information and performs the 11th process described below.
The signals are sequentially output to the output terminals θΔ to θ15 according to the flowcharts shown in FIGS. This output signal is input to the output control circuit (FIG. 16), subjected to logic processing, and then output as an output signal group to drive each load.

The microcomputer will be explained with reference to FIG.

Figure 7 shows the microphone and computer TMS-1000 manufactured by TEXAS. It is a circuit block diagram. Among them, I (OM) is a read-only memory in which the sequence contents of the copying machine shown in Fig. 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 an address is set. be.

Control contents are stored in 8-bit binary format in order from address 0 to the final required address.

]'LAM is a read/write memory that temporarily stores data and the like during program execution, and is a memory that stores one set of binary codes. The details are shown in FIG. 8, each bit is composed of a flip-flop, and a set is selected by an address designation signal, and an OR, AM The address in which the information is stored is specified by the X register and Y register. In addition, the CPU has AI, U, and 'R functions that decode input data and process data.
, a program counter PC for specifying addresses of instructions stored in OM, and a page address register PA for specifying page addresses of instructions stored in ROM.

Page buffer PB for changing pages of R, OM,
Accumulator A for temporarily storing the 1D operation result for calling a subroutine and decoding the instruction stored in the subroutine return register SR2几0M for storing the original return address after the execution of the subroutine is completed.
It consists of ll, etc. Input terminals I,, I2.
I,, I.

is connected to INPUT, and the output terminals 01-0,,H
Sarel connected to OX ROVTPVT.

To give an overview, the CPU first specifies the address of the ROM in which 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 program starts from power-on. Sequentially, in chronological order, at times the data is processed within the CPU itself, at other times the data in the CPU is stored at a specified address in R, AM, and at a specified address in R, AM. Inputs the data into the CPU, and sometimes Cpt
Sequence control is performed by outputting the data in J to the 14-input signal line of the output section J, or inputting it into the CP rJ from the input signal line of the input section.

Base 4 (timing is shown in FIG. 9) for program processing of 'T'MS 100O.

The several μsec clock 0 (from nsc in FIG. 8) in FIG. 9 is the basis of program processing.

1! (It takes two clocks to decode the program counter 1, and it takes two clocks to specify the decoded 11.OM address. At the same time, the block program counter P
Add 1 to C, 1 clock to decode the instruction of one block of R, OM, and 1 to write tJF to RAM.
It takes a total of 6 clocks to complete one instruction. The programmed instructions following the above address are executed at similar time intervals.

(Human cart) The number of status signals to be input from the copying machine is large, and the number of status signals input from the copying machine is not the same as that of the input capo. is. 1st - probe terminal 01
~3 and human powered boat 1. 〜■ Shows the relationship with 8.

Table 1 CLKP is the clock pulse (generated by using the same as 1), PEP is the paper out signal, LEP is the liquid out signal, C3TP is the copy button, and CB 1-IP is the original platen home position. , TSC is toner (supply command, PDP
is a paper detection signal (transfer paper), , B5°A4, B4BP is a document platen reversal signal for each paper size, MSI and Mg2 are micro switches (for paper size detection), and JAMK is a JAM undetectable signal.

Furthermore, human cuff+? -G■1 is drum clock CL K P
and a time signal L D EN (described later).

In Table 1, the status from the input signal group changes every moment,
The computer reads 01°θ2 at the time you want to read it. A probe signal is output to any of θ3 (these θ1, θ2, .
For θ3, there are no signals output at the same time) A desired state signal is read in 4 bits (1, T2°T,, I8 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 scents 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 (r"Ep=1). Therefore, the NkND gate 30 of the matrix circuit
0 input 3' becomes O level. On the other hand, NAND30 Q
A probe signal θ1 from the microcomputer shown in FIG. 6 is input to 4'. This PEP signal is read from the input terminal (2) with θ1 set. Reading of other input signals follows Table 1.

In the control flow, reading paper etc. is shown in Figure 11.
It is executed on 5UB2P of E ps, and this 5TEP8
When the program progresses, a level is set in θ1 every time 5UB2P is passed, and θ1 is immediately reset to 0 level when reading is completed. The time it takes from setting θ1 to completing reading is approximately 60 minutes.
1L5 (2C.

While this θ1 is set, other reading II + B1
1-Bushin υ゛02. θ3 is at 0 level.

1 (1j) Since θ1 is now set, the human power 4' of the NAND 300 in FIG. The human power, that is, the output of 303 and the output of 307 are at a level because θ2° and θ3 are not set.

The output 24' line of this 308 is input to the microcomputer in FIG.
It is read in. The read data is stored at address 11 1 T of the Y register in the It A M area shown in FIG.
1 (hereinafter referred to as (0, 1.)). SIJI3T-P determines whether BTTl is O or 1, and when it is 0, the paperless Shinso is output as a rubel at 013 in Fig. 6. When the rubel is output at 34' in Fig. 16, the 432 is turned on, the output of 432 becomes 0 level, and the paper indicator lamp lights up.

If there is paper in the cassette, the input 3' of 300 in Fig. 15 is level, so the output of :300 is θ1
Since it is read as a rubel, it becomes 0 level, and the output of 308 is judged to be Lebel diagram T (and AM's BITI is Lebel nTTl as Lebel dW(), so no paper out signal is output to θ13.

Input 1 in the same way at each program step above.
The data of 1Y is read and judged, but the input group signal of IJ Lux path - 31 in the logic gate (Fig. 15)
0 is PEP, C B It r-B P signal O
J311 is T, EP, TSC, MS
] Signal 011,313 is CSTP,]]DP, Mg
2.

It supplies the OJ of the JAMK signal to the CPU.

The feature of the IJ Lux path embodiment is that the document platen reversal signals for each paper size, that is, B5, A4, and B4, are input to the OR circuit, and only one reversal position signal is provided on the matrix. be. Normally, the number of human signals to be controlled by ili 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. It has become.

However, at the same time, we focused on the fact that the document platen reversal signal for different paper sizes cannot be manually input, and created a method in which the paper size is memorized in the R and AM areas in the size subroutine, thereby distinguishing the document platen 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 4011, resistor 406, capacitor 403, and capacitor 404 is 5 K T-T.
It is a z oscillator. This oscillator uses a triac (not shown) to drive the A and C loads such as the main motor in this copying machine.
A pulse transformer is used for the IJ, and the oscillator is used to drive the triac through this pulse transformer. Therefore, AND game) 4 0 9
, 4 1 0 , 4 1 1 , 4 1. 2, 4
．． '1. 3 are all 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 0 level for 4 seconds after the power is turned on, and becomes a 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 ANI"+408 is connected to the developer motor, and outputs the signal at E, which is used for post-processing from the time the +L power is turned on. Therefore, these A, N, and D signals are 4 from the time the power is turned on. Outputs level for a second. After that, it will never reach 0 level.

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 AN+) 415 outputs a paper feed signal only when the original platen moves forward, and when the original +I: 4 units move backward, the (1i number) is input at the same position as when moving forward, but at that time 27 is at the 0 level. ``Because it is on, the rubel is not output to AND415.

Inverters 416 to 429 are Darlington transistors for driving a load, and drive the load with an input signal.

/j( shows the contents of the loads on the inverters 416 to 429.

Table 2 The inverter 416 is a full surface exposure lamp (ABXP) K.

417 is 1) 11 Dew, (PEXP).

418 is AC static eliminator (to I-Iv8) to the main motor (DRMD).

419 is the document table advance motor (CB FW).

420 is! To the reverse motor (CBRV).

421 is a tenth-order charging device, a charger, a transfer charger (r
-1VDC), and the original exposure lamp (IEXP) 422 is a blank exposure lamp (IXP) K.

423 is a developing unit (DVT, D) K.

424 is Bahu #- Rudo +) Le- (PHCD).

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

427 goes to Gi (PEr,).

428 is liquid ('L Ti; L).

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 D. Also, blank exposure is m13,1
As shown in the time chart in Figure 4, the exposure lamp (IE
The light is lit almost in the opposite direction to XP), and the difference in 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.
Further detailed 70-charts 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 ( PU-TLS). 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 shown in FIG. 300K H by sc
It is set to z. In other words, the time of one clock is T=1
/f (seconds), it becomes about 33 [μ5ec], and with 6 clocks it becomes about 20 (μsec). Therefore, it takes 20 (μ5ec) to execute one instruction, so 200,000 instructions. Create a 4 second timer depending on the number.

That is, following power-on, RAM area address 15
．． We put 10 in 2, 15.3, 15.4, and first R
Repeat the subtraction of the number 15 in AM area 1 until it becomes 0. If it becomes 0, subtract 1 from 15 stored in RAM area 2 to make it 14. Next, the ILAM RAM area 115 which is set to 0 is inserted. So again 11.
AM Repeat subtraction in area 1 until it becomes 0.

Each time it becomes 0, subtract 1 from the contents of R, AM area 2, and
Each time the area of LAM2 becomes O, 1 is subtracted from the area of RAM3, and the process is repeated until all of the R, AM areas 1, 2.3°4 become O. The numerical value of the l'jAM area is determined so that the number of instructions during this period is approximately 200,000. still,
FIG. 20 shows a method other than this embodiment for realizing this 4-second timer.

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, 2O
-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, if the copier is left unused for a long time, toner tends to stick to the cleaning blade. seconds) 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 is CT (.

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 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 to discharge, and if the standing time passes for more than 7 hours (the 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.
Then, the long-time neglect signal T and DEN signal are output.

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 the power is turned on, STE'P1 is first executed in the manner described above, and the developing device motor is turned on. (STEP 2) This developer motor can also pour developer into the vicinity of the contact between the blade and the drum surface, thereby dissolving the dried toner on the blade and drum and facilitating cleaning during 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 this case, in computer control, unless the TAM detection circuit is disabled, the JAM indicator lamp will operate and the sequence will stop, making it impossible to confirm the sequence.

Therefore, in this embodiment, in FIG. 8, if CP,1 is shorted to ground before power is turned on, the inverter 210
The output becomes high level (hereinafter referred to as 1) and enters the matrix circuit (FIG. 15) 21'. On the other hand, Ma) IJ
Lebel is input to the Fuchs path 1' from the output terminal 52 for 4 seconds after the power is turned on. Therefore, the output of NAND 314 remains at 0 level for 4 seconds. During this time, the output of AND31'0 is in level. This is because the 4-second timer is created only by a microcomputer program, so θ1. θ
2. This is because the probe signal is not output at θ3. Then, the output of NANDr 311 becomes 0 level.

S'r'l? : I' 3 reads this 0 level. As will be described later, the information read in ST18P3 is stored in the TLAM and used when determining whether the transfer paper has arrived at TEP38 in FIG. 12. Next, proceed to 5TEP4 and determine whether the 4-second timer mentioned above has timed up.
When the time is up, the process advances to 5TEP5 and the load of the main motor etc. is turned on.

In STEI) 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 outputs the LDEN signal 4 seconds after the power is turned on. Loading 11. A flag is set on one stroke of AM. At this time, the photoreceptor has not yet rotated, so CLKP is not input.

Furthermore, after the 4 second timer ends, AND201 PUTI, S
Since the signal is at 0 level, even if the level of the LDEN signal is input, the output of AND201 is 0 level, so the output of OR gate 202 is that only the clock pulse CLKP signal generated in synchronization with the photosensitive drum is sent to the computer. is input.

After the -4 second timer ends, the contents of the data read in 5TT3P6 are judged in 5TEP7, and if the L time is 7 hours or more, the drum is further rotated in 5TEP8.9 and pretreatment is performed. Do this for 40 seconds. ON at 5TEP5 during this time
Only the loads that are now being driven are being driven. If the leaving time is within 7 hours, the preprocessing 40 second timer does not operate and the process shifts to 5TEP10. Here, while the 40 second timer is not up, subroutine 5UBCB11
．． Execute V, SUB LP, 5UT3 5IZE.

This SUB CBRV, SUB LP, 5UBSIZE
While the 40-second timer is running, the scanner always detects if the document tray comes into contact with the document table and comes 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 the routine.

In subsequent steps, these 5UBrLOUTE
N is placed everywhere.

The 40 second timer is based on counting 80 clock pulses (CLKP) (one clock time is about 0.5 seconds) generated in synchronization with the photoreceptor. 40
When the second processing is completed, CT at 5TEPIO, 11,
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 PUR8 is completed. 5TEPI 1 determines whether CL KP has been counted to 10.

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 the details of 5TEP1o and 5TEPI1. In Figure 17, 5TRAP10-1 is 10
Start clock count, start clock reading at 5TEP10-2, clock signal 9cLKP is level or 0
Determine the level. Now when CL K P is Rubel, S
Proceeding to TEP10-4, it is determined whether the original platen 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 and monitors the loading of the cassette, and also determines the presence or absence of liquid and displays a notice. (:
``If I, K P becomes 0 level, 5 TEPIO
-7,5 Proceed to TEP10-8 and repeat the same process. C.L.
If K P becomes a rubel again, it means that 1 clock has been counted, so repeat this and get 5TEP1o-
At 12, it is determined whether 10 clocks have been counted.

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 glass is reversed by the reverse position signal, the home position is detected, and the document glass back motor is turned off, the document glass still sticks out from the Baum position (because the user of this machine has touched the document glass). 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 O 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 clock, so there is a risk that the back motor will be overloaded.

Next, after CT and K P 10 counts are completed, execute S'l"EI'12 to check whether the copy button is pressed. If the copy button is not pressed, the remaining 6 clocks of one preprocessing rotation are executed. 5TET to count
l 3.5 Run TEPI 4. If the copy button has been pressed, the process advances to STEP21 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.

During this post-processing, even if the main switch is turned off, a power hold signal is generated to maintain 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 5TEP2j. When the post-processing is completed, the copying machine goes into standby mode. This is why all loads are turned off in S and TEP19.

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 on standby for a long time, but since the temperature inside the machine is higher than the room temperature, toner adhering to the cleaning blade tends to stick.

This may have an adverse effect on subsequent image formation. 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 5TEP21, 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, in step 24, after 9 clocks have been counted, the Cl5FW signal is output from the output terminal θ5 to advance the document table. 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 S'rEP26
At EP27, the 5UBTSL routine is performed to detect the developer concentration. If the developer concentration is low at this point,
The out-of-toner flag is set in RAM and used for sequence processing described later. Next, in the paper size determination routine of 5TET'28, it is determined which paper size cassette is currently installed.

As mentioned above, this is the microswitch MS1゜MS2
The paper size signal is created by the combination of

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.

When the paper size is determined in 5TEP 28, the size flag is set in the RAM and the process branches to one of the flows related to B5, A4, and B4 sizes (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 through the Hall element.
) is required. During this time, the microcomputer executes the previous paper size 'I'll specific routine. Then, the printer waits for a paper size other than the desired paper size to pass through the reversal position.

That is, in A4 size, B5)<B5. A, 4 By detecting the fall and rise of the signal of the Hall element for inversion position detection, its passage is determined (sTp, ps4, 85.86). and S
When it is determined by TF and B87 that the document table has reached the reverse position of B4, the document table 1) is sent to the document table 1) by 5TEP88.
Turn off BFW and blanking lamp BEXP and output reverse signals CBR and V.

Next, 5TEP89 is the accumulated jam detection routine PDP1, 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 is staying in the machine, the progress of process 5TEP is stopped, a stagnant 5 report is sent, 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 90 whether the original table has returned to the home position, and when it has returned, the document table stops moving backward (STEP 91), and the process proceeds to a routine PDP2 (STEP 92) for determining a delayed paper jam.

Note that the subroutine TSSD is executed between the determinations of B4BP and the original platen stop position. This routine is s'rE
The flag set in the RAM in the TSL routine of p27 is reset when the developer concentration is restored when executing 5TEP87°90.

In addition, the JAM detection PDP2 routine of 5TEP92 is delayed, and the TAM detection is after 5TEP89 has determined that the previous sheet has not accumulated, so this time, the transfer paper that has been transferred and is about to be ejected is inside the machine. Detects when the paper is not being 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
When TEP92 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, 5TEP94.5TEP95 is executed, which increases the number of 7 prints by B1.

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 trailing edge of the paper always enters the sequential connection process in which it passes through the paper discharge 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.

The routine is TETJ. This judgment is made by using the flag set when the developer concentration is low at the back position of B5 in 5TEP27.
In U B 'r S S D, when the developer concentration is still too low and cannot be reset, the concentration is determined again just before starting post-processing, and if the developer is low, a 5-report message indicating that there is no toner is issued. be.

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 more detailed explanation of this is shown in Figure 19-1.
, 'I' 11. To the circuit and the flow in Figure 19-2.
- It is. Fig. 19-2 shows one example of B5 size. In Figure 19-1, 501 is the phenomenon
This is a judgment circuit, and if the liquid concentration is low, the output of 501 will be level.On the other hand, the toner supply period is from the time when the document table moves forward until it enters FIi.This toner supply possible period. For example, if the main switch is repeatedly turned on and off, a signal may be generated that indicates the liquid is thin. Then, the light receiving element receives this and detects it by the change in the resistance value of the light receiving element.In this case, turn on the main switch, the developer motor starts rotating, and the lamp lights up before the liquid flows into the slit. Therefore, the resistance value of the light-receiving element is small, which is equivalent to a liquid concentration of 1.s, and toner is supplied.Therefore, when the main switch is turned ON,
If ' is repeated, the developer concentration will become abnormally high, which will have a negative effect on the image.

Even if the total liquid 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 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 5TET" 25-1, a toner replenishment enable signal is output at the next 5TEP. Therefore, for the first time at this time, the output of the innocutor 508 becomes 0 level, the transistor 506 becomes OTi'F, and the calculation The output culvert of the amplifier 501 is supplied to the transistor 50.2, which activates the toner supply solenoid 503.

However, if there is no toner, the output of the arithmetic multiplier [1] 501 remains at 1, and the output of the inverter 505 becomes O, and a signal indicating that the toner is thin is read into the microcomputer through the matrix circuit. That is, TSL of 5TEP27
In the routine, toner 4 (1, flag is It, memory is stored in AM area 1s TEP 30. The flag is set in the TSSD routine of 41). ?iP!50
In the placement routine (5TEP96 for B4 size),
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 9G 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 that the copy button is still pressed in 5TWT'93, the process moves to ◎ in Figure 11 again. Turn on the document table advance signal and repeat the same process.

Up to this point, we have explained the sequence for B4 size, but the same applies to other B5 and A4 sizes.1. IAM
The only difference is the detection method, so the description will be omitted.

The JA,M detection method will be explained in detail with reference to FIG. For B5 size (Figure 18-1), first 5TEP30
After the document table reaches the home position, proceed to the routine shown in Figure 12 (■), the clock will be counted 5, and the 5TEP will be counted.
At step 45, it is determined whether the transfer paper is on the paper detector 180.
If there is no retention of the previous sheet, 5TEP 48 further counts 4 clocks and determines whether the transfer sheet has reached the paper detector 180. If it has reached the paper detector 180, the signal from the Hall element 129 will be an O bell as shown in Fig. 23 (C1).If it has reached the paper detector 180 (transfer paper delay), the transfer paper is being fed normally. It shows that it is coming.

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. Further, the delay is determined according to FIG. 18-3 (II 5 B3 T in case of continuous copying of a large number of sheets in B5 like C1), and only the last copy is based on the clock.

Furthermore, in this embodiment, in the case of R5 and A4 size, JAM is detected using a clock, but a clock φ for driving the microcomputer as mentioned above may be frequency-divided, or
An external low frequency oscillator can be used.

In this embodiment, the method of disabling these JAM detection operations is to short-circuit the CPI (JAMK) in Figure 8 to ground, but it is also possible to electrically input the number of copies etc. from the outside. This can be done using the numeric keypad. In other words, the input signals for JAM killing (ignoring the signal L TV P), paper killing (J A, M killing, liquid killing, paper killing (ignoring the discrimination of the signal PEP)) are encoded, and the input signals are input to the numeric keypad. (Figure 11 S'r)
14), a flag is set at a specific address in the RAM area, and a step is provided in advance to jump to this step immediately before the jam detection, liquid, and paper discrimination step during programming. When it is executed, it reads the corresponding killing data storage address in RAM and determines whether the flag is 1 or 0. If it is O, it proceeds to each determination step, and if it is 1, it jumps the determination step and proceeds to the next sequence step. be.

Moreover, in the present invention, B'5. 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 a predetermined CLKP is counted) is not output for a predetermined paper size, the document table is automatically reversed. This timer is
Count LKP, use an external low frequency generator, or use a frequency obtained by dividing the microcomputer drive clock φ.

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,
ACloo even if the main switch is turned off during post-processing
There is a line to which V is supplied.

Even if the main switch is turned off during this post-processing, the ACl
In order to supply ooV, the driving signal of this circuit is
These are the power hold PHT and D signals mentioned above. The cleaning blade can be removed from the drum by turning off this Pl(-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 is also turned off. However, since the smoothing capacitor included in the smoothing circuit has a large capacity, the discharge time is long (about several hundred rpsec).

In addition, there is plenty of room in the operating range of the power supply voltage of the microfun computer. 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, ]"LO'M, etc. start to malfunction. At this time, when a power hold signal is output from the RAM and TLOM 1y (output), the AC 100V line mentioned above continues even though the main switch is turned off. I will live again.

In this case, of course, other IT A of the microcomputer
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 resistor, 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,
The circuit constituted by the Zener diode 611 is a well-known constant voltage circuit, so its explanation will be omitted. The voltage of the Chena diode 602 is about 20V, and the base current is supplied to the transistor 605 through the resistor 601. 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. The transistor 605 becomes conductive, current flows through the resistor 604, and the collector of the transistor becomes approximately O potential. On the other hand, through the resistor 604, the transistor 607
Since no base current is supplied to the 0 base, the transistor 607 is in a non-conducting state. Therefore, only the Zener current supplied to the resistor 611 flows through the resistor 606, a Zener voltage of 16V is maintained across the Zener diode 6120, and a constant voltage of 15V is supplied to the output. However, as described above, the post-processing is completed, a power hold signal is output from the control circuit, and the +24Vt source 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 has a potential of almost 0■,
No Chena current flows through 611, and the output voltage becomes 0.

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

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 BRLBDDDPAGE
0 MNE2 LBCCCBL LllllflEGBRLB
AA LBD [LD TCY 4DYN TCMIY
3 MAN TAN LBHH)I CALL 5UBSIZEN
E2 BRLBHHCALL 5UBLP YN DMAN CALL SUBCCMDTAN MNE
Z Listen EZBRLB99? BRLBCCBRLB99[1 LB997 BL LB34 BL LBDD LBAA IYCLa9O8CALLL 5UBCBR
VBL LB5 CALL 5UBCNTLBBB
IYC, TCY 4 MAN BL LB4 TAN LBCCIYCXNEZ SRLBHHH BL LB3 LBAAA CALLL 5UBCNT BL LBB
BBTCY 4 PAGE l DMAN TCY 2 ↑A SETR MNEZ TKA BRLBCCC: R9TR TCY 0, La3O0TCY 3↑AM TCM
[Y 4 TBITII LBX TCY 15 BRLBA TCMIY O BROTCY 3 ETN LBA BL LB25 La3O1TCY 2SUB
SIZE BRLBB' 5ETRLBC5ETR, T
KA TEA R5TR R5TRTCY 0 TCY 0 TAM TAN TBITI 3 TBITI 2 BRLB303 BRLa3O1, TCY 3 TCY 2 TCMIY2 SETRBRLBX TKA La2O2TCY 3 R3TRTCMIY I TCY OBRLBX TAM LBB CLA TBIT13 TCY 3 BRLa3O0TAM TCY I TOY 2 SBIT l BRLBC TMA PAGE 2 TDO5UBPDPI TCY 1 TCY 3 SETR TCMIY 0 TKA TCY 15 RSTR TCMIYI TCY 0 TCY3 ' TAM RETN ' TBITI 3 BR9UBJAMCALLSUBCBRVLBp R
ETN TKA LB700 CALL SIJBJAMSUBPDP2
BRLBCQ BL La9O1 and BCJ 5ETR
LBCQ TCY 12TKA TBITI 3 RSTRSRLBD TCY 0 TCY 1 TAN BRLBCJ TBlT13 La7O9TCY 1 BRLBD 5ETR BRStlBJAM TKA SUBJAM TCY l R5TR 5BIT 3 TCY 0 TMA TAM TDOTBITI 1 TCY 10 BRLB509 SETRTCY 5 LB800 DYN SE DING R R5TRBR! ELIBJAM YNEC6Ln2O3TCY 5 BRLa2O2R3TR TCY 4 BRStlBJAM LB900 R3TRPAGE 3 DYN 5UBCNT TKA YNEC0TCY 0 BRLB! 1100 TAN BRLa7O9TBITI 0 1311i 5UBCNT BIHTI CALLL '311BSlZE La
5O1TKATCY 0 CALI, L 5UBLP TA to TBITI 0 BRLBE, TAN BRLa5O1, TBITI 2 SUBTSSD TCY l BRLBESETRLa
2O2TCY +4 TKA MNEZ R3TRBRLBBOI TCY 0 RETN TAM La2O2TCY 1 TBIT12, 5BIT 0 BRLBLLL TMA BRLEE TDO LBLLL TCY 14 TCY 6TOIIYO ,
tllsTR RETN LBE RETN 5UBTSL' TCY I PAGE 4SETRS
UBCCMD TCY 0 TKA 5ETR RSTRTKA TCY OR5TR TAN TAN TBITI 2 TB[T13 BRLa2O2BRLa4O1 TCY 14 La4O0TCY 2 TCMIY 1 TCMIY 0 RETh BRLB F LB500 'TCY 14 La4O1TCY lT
CMIY OTMA TKA La4O2TCY 2 R9TR' TCMIY l TC:Yo LBF DYN RETN C:ALL 5UBLP LB45 TCY 2 SETRCALL 5UBCBRV TKA TKA R9C RTCY 0 TCY (l TA calendar TAN TBITI 0 TBITI l SRLBCK BRLBMMM BRLBINT2 BRLBNNN LBCK BL LBRLP LB ni Tomo []1 L84El ShiB90C10BL LBINTI LBNNN BL LB47 PAGE 5LBP T
C:Y 2 TCY ll 5ETRDMAN TKA TAN R5TRMNEZ TC:Y 0 BRLBJ TAM BRLBK ShiBaB4 TBITI l BRLa9O9LBK CALLLSUB BL,
LBFFF BL' LBI (100LB999 LO
P 12 5UBCBRV TCY 1BR0SETR LBθ01 TCYO7KA TAM R5TR 3BITIOTl:'/ 0 BRLa9O00TAM TBITj 1 LBINT2 'CALLL 5UBSIZE BRL
BlooTCY 5 SETRRBIT 1 11ETN, TM Hachihe B100 TCY 5 TDO RSTRLa2O2RETN ETN StlBLP TCY 0 LBJ BL LB51S
E-cho RPAGE e KA R5TRLB411i CALL 5LIBTSSDT
CY 0 TAM BL LB45 TBIT12 LB47 TCY 2 BRLa2O05ETR TCY I TfA SBIT 2 RSTR T calendar A TCY 0 TDOTAN BRLa2O1TBITI 1 LB200 TC:Y l BRLB48T M8 TDOCALL 5UBTSSD TC:Y 15, BRLB47 NEZ BRLBJJJ LB48 CALLLSUBTSLL
B201 TCY OTCY 8 TBITI l 5ETR BRLa2O2TCY 4 LBJJJ TCY I R5TR 3BIT I TCY 5 T ＾ 5ETR 0O BRLa2O2CALl, L 5UBPD yen LB202
TCY 1 LB49 TCY! 5ETRLP40
CALLL 5UBPDP2TKA TCY 11 R3TRTCMIY7 TCY 0 TAM LP41 CALLL 5UBCNTTBIT
I I TCY 11 BRLBS0 DMAN AM CALL 5UBTSSD BRLP49 CALL 5UBSIZELB50
TCY 5 R11iTRCALL 5UBLP CALL 5tlBPDP2 CALL 5IJF
3C (240TCY II MNEZ TCMIY 7 BRLBM BRLBO LBS1 CALLSUBSIZE LBOTcY
11)INEZ CALL 5UBLP BRLB42CALL 5
UBCCIID CALLL SUBOkitomo EZ BRLBL BL LBlooO CALL 5UBCNT LB42 CALL 5
UBCBRV CALL 5UBTSSD CALL
5UBTSSDLDP 5 ORLB41 BR0LP43 TOY 8 5TR LBL BL LBIEi TCY 4PAGE?
5ETR TCY Ei DMAN 5ETP TAN TCY 5 BRLB34 STR DMAN LP36 CALLL StlBPDPlT
AM TCY 4 MNEZ TC:MlY 4 BRLP44 LP37 CALL 5UBTSSD CALL 5
UBPDP2 CALL 5UBCNT BL LBP TCY 4 MAN LP44 CALL 5UBTSSD TAMBRL
P43 NNEZ LB to BL LP18 BRLB37PAGE 8 LBU4 TC:Y 8 CALLStlBPDP2
ETR TCY 5 BL LBP R5TRLBS8 TCY 8 TCY 8 5ETR R3TRTCY 8 TCY 4 R5TR1 5ETRTCY 5 MNEZ RSTR BRLP35 TCY 4 BRLBS8 5ETR CALL 5UB TSSD TCY 4 LP01 CALLSUBCNTCAL
LL 5UBTSSro TAN LllTCY 4 M
NEZ DM^N BRLP33 LB TAM BRLBS8 BL LB40 PAGE! 1 TCY 5 LP33 CALLSUBTSSIIM
AN TAM CALL SUBC BRV MNEZ BRLB32 BRLP30 LB2000 TC'14NEZ CALLL 5UBPDP2 BRLBS LBBRL
BT BL LBP LBT' CALL 5UBPDP2B30 C
ALL 5UBTSSDCALL SUB placement BL LP29 LB' LB31 TCY 5 BL LBlooOLB:TC
: MIY 4 LBZ to NEZ BRLBU LB32cALt, LsuecNt, B11LBVCA
LLL 5LIBSTZE, LBU BL LB1
2CALLSUBLP LBV BL LBIOLB
I TCY 1 CALLSUBCCMD RBIT 1TCY 3 BL LBXORETN LBRTCY 5 DMAN LBQ BL LB43 SBLLB23LBKKKTCY1 PAGE 10 5ETR 24TCY2 TKA SETRR5TR 15A TCY 0 RSTRTAN TCY 0 TBITll To TA BR, L day 27 TBITI l BRLBKKK BRLP24, LB2? TCY 5BRLBW
R5TR 15CALL 5UBSIZE CALL 5UB
SIZETBITI 1 BRLBY CALL 5UBLP BL LP45 CALLL 5UBCCNDNEZ CALLL 5UBTSL BRLB28'8TCY5 SETRBL LB31 TCY 8 LP28 TCY 5 SETP TC NrY 4 TCY 4 R5TRLP29 CALL 5UBCNTTCY
4 CALL 5UBCNT 5ETR TCY 8 CALLSUBCNT ' R9TR and DP 9 CALL 5UBCNT BR0 LBW LDP I CALL 5UBPDPI BR0 PAGEIICALLLSUB[,P CALLL 5UB PDPI CALL SUBCC
MDLB20 TC:Y 2 MNEZ SETRBRLB995 TKA BRLB984 5TR TCY OLB985 BL LB38AM TBITI I LB994 CALL 5UBCB
RVBRLB21 CALL 5UBTSSD BL LB200OBR
L day 20 LBXOMNEZ BRLBCY LB21 CALLSUBP [lP2 BRLBCZ
BL LB999 LBCY BL LB29LB22
BL LBAAA LBCZ BL LBRPAGI
E 12 LBBBB CALL 5UBPDPI↑CY 4
CALL SUBSIZET CMIY 4 7BIT
I O BRLBI7 LB23 CALL 5UBTSSD BL LB2
4CALL 5tlBCNT LBI7 CALL
5UBTSLTCY 4 LBIII TCY 4 DMAN RSTR TAM TC'/ 5 ETR CALL 5UBSIZE TCY 8ETR TC:Y l LBEEE CALLLSIIBC:N
TSETRTCY 8 TKA 5ETR RSTRC: ALL 5UBTSSDTCY 0 T
CY, 5'rAMR8TR TBITII TCY 8 BRLBI8 R3TR TCY 4 CALL 5UBTSSD 5ETRBRLBIII
DMAN LBI8 TCY 5 TAM R9TRMNEZ T(:Y 4' BRLBEEE TCMIY 2 LDP II R0 LBGGG CALLSUBTSSD PAGE +
3LBIOTCY 3 CALL 5UBSIZE R9TRTCY 4 CALL 5UBL;P R9TR TCY 10 CALLL SUBCCMD LBII ' R9TR
MNEZ, DYN BRLBI9 YNEC: 5 BRLBII BL LB22 LBI9 TCY 4 CALLSUBCBRVMA
C IA CALL 5UBSTZE A TAM CALL 5UBLP CALL SUBCCMD TCY 6ETR BL LBZ TCY 8 LBI2 TCY II 5ETR TC rY9 TOY 5 LB13 TCY 3 R3T R ETR TCY 7 BL LBP LB14 5ETR IYCtBOOo BL LBIO YNEC10P, AGE 14 BRLBI4 TCY 11 TC'MIY El CALL 5UBCNT LB8 CALLL 5UBCBRV CALLL 5UBC:BRV CALLL 5UBSTZE CALLL 5UBSIZE CALLL 5UBLP CALLLSUBLP CALLL 5UBfl:CMD CALL L SUBCCMD MNEZMNEZ BR
LB985 SRLBI5 BRLB984 BL LBlooOLB9BS BL LBI2LB1
5 Tl:”/ 10 0MAN LB984 CALL 5UBCNTTA
I4 TCY II MNEZ DMAN FIR'1. B13 TA to LBI6 TCY 4 MNEZ SETRBRLB8 LB100OTCY 7' BRLB3000RST
RTCY 13 TCY 13 DHAM TCMIY 2 TAM TCY, El to NEZ R3TRBRLB5000 LB5000 rcy n T(:MIY OBL LBOOO LB3000 TCY 9 PA(iE, +5R3TR
LDP 15 TCY 10 LDX 0 SETRTCY 10 LBI R9TR CALLL 5UBCBRV TCMrY OYN CALLL 5tlBSIZE DYNBIT LBI CALLL 5UBLP CLO TCY 9 CALLL S LIBCCMD 5ETR'MNEZ
TCY 7 BRLB993 LB3 TC to rY 10BRLB9
92 LB4 TCNT'M5LB,! 33 TCY
10 LB5, TCMIY15R3TRTCMIY
15 BL LBI2 CALL 5LIBCBRVTCY
12 LB992 CALLL 5UBC'NT TKATC
Y 11 TAN [1MAN TOY 10 TAN LBII DMAN XNEZ TAN MNEZ -BL LBlfi BRLee END YN MAN AN LOP 0 BR0 LBDD TCY II TCMIY 10 TCY 3 E TR TCY 7 ETR TCY 8 ETR TCY 8 5TR LB7 BL LBINTI LBIll[, P, CALL ,I,5uBcBRv
CALL 5tlBSIZE CALLL 5UBLP TCY 11 14AN TA to MNEZ BRLB7 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, and FIG.
A is a longitudinal cross-sectional view of Fig. 1, Fig. 3 is a cross-sectional view of the first, and A is a longitudinal cross-sectional view of Fig. 1.
5 is a perspective view showing the cassette, FIG. 6 is a control circuit diagram, FIG. 7 is a block diagram of the microcomputer, and FIG. 8 is a RAM area diagram.
Figure 9 is the basic time chart of a microcomputer.
101N is a system flowchart of the operation of the copying machine shown in FIG. 1, FIGS. 11 and 12 are detailed flowcharts of FIG. 10, FIG. 13 is a B5 size operation timing chart, and FIG. 14 is a B4 size operation timing chart. 1.,
Figure 15 is an input matrix circuit diagram, Figure 16 is an output control circuit diagram, Figure 17 is a control flowchart for clock level and 0 level, Figure 18-11)6 is a jam detection flowchart for B5 size, Figure 18-2. is a B4 size jam detection flowchart, FIG. 18-3 is a jam detection timing chart, FIG. 19-1 is an ATR flowchart 11, FIG. 19-2 is an ATR circuit, FIG. 20 is a clock generation diagram, and FIG. Figure-1 is the measurement circuit when left unused, No. 21-2
The figure shows the operation time chart of Fig. 21-1, Fig. 22 shows the electric 2+ circuit, and Fig. 23 shows the circuit example of the input sensor of Fig. 6. I4. IQ is the input terminal f to the computer, 01 to 015 is the output terminal 1 to the computer
'-, A4BP, B4BP, B5EP! The i unit reversal position signal, MSI and MS2 are cassette size signals, DDP is a paper detection signal, TSC is a toner density signal, and TSE is a toner replenishment enable signal. Applicant Canon Co., Ltd. No. 750 B4 (a) h or (b) Shireisho 3! ! Ren yAM JAM (C) f-Yamari Negative 13 Original (self-motivated) June 29, 1980 1, Display of “If l (, 1983 Patent Application No. 112865 2, Name of the invention Image processing device 3 , Relationship with the 16 amendments Patent applicant address 3-30-2 Shimomaruko, E1-ku, University of Tokyo Name (+0
0) Canon Co., Ltd. Representative Ryu Kaku Part 1''''!!Kobi 5, Specification to be amended 6 Contents of amendment (1) The scope of claims column of the specification will be corrected as shown in the attached sheet. (2) Page 4, page 4 to page 11, line 9 are corrected as follows: [In such devices, it is known that the process sequence is controlled by a conventional program. There is a known method that performs 11) inventory of the developer in order to obtain an image.However, if each of these is operated independently, the developer may be wasted.The present invention solves the above drawbacks. a first process means for image forming processing; a computer means including a memory storing a program for controlling the process means; a second process means for processing related to image quality; 2. An image processing apparatus comprising: a state detection means; and a first control means for controlling the second process means by the detection means, and the first control means is further controlled by the computer means. . ” 12. Scope of claims J - Hand-based sales formal writing (method) % formula % 2. Name of the invention Image processing device 3. Relationship with the person making the amendment Patent applicant address 3 Shimomaruko, Ota-ku, Tokyo -30-2 Name Hoo)
Canon Co., Ltd. Representative: Ryu Kaku, Department 4, Agent/I': Address: 3-30 Shimomaruko, Ota-ku, Tokyo 146
25. Daily publication of the amendment order, October 30, 1982 (Shipping daily) 6. Specification and drawings to be amended (within ゛G (: changed)

Claims (1)

[Claims] means for image processing; means for generating a series of first pulses; means for counting said i1 pulses; means for counting said i1 pulses;
means for generating a pulse, a reference signal generating means, and a control means including a memory storing a program for controlling image processing according to the first pulse, the reference signal,
An image processing apparatus characterized in that control is performed based on the first pulse and the -1- distribution two pulses.