JPS6090363A - Image forming device - Google Patents

Abstract

PURPOSE:To always obtain a good image by constituting so that a control means has a means for operating a process means by a prescribed sequence without a prescribed control, and this means and a data input means are used jointly. CONSTITUTION:This device has an exposure operating means of an original platen 5 or optical systems 16, 18, etc. in order to form an electrostatic latent image on a rotating body 15 such as a photosensitive drum, etc. In this case, this device has plural process means for forming an image, an input means for inputting a necessary data for forming the image of a desired number, and a control means for executing a sequence control to the process means in accordance with an input data from a key input means. Also, this control means has a means for operating the process means by a prescribed sequence without a prescribed control, and its means and a data input means are used jointly.

Description

[Detailed description of the invention] The present invention relates to an image forming apparatus such as a copying machine.

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 corresponding to the image is formed. Further, the latent image is entirely exposed to light to form an electrostatic latent image with a high film last, and then made visible by a developer mainly containing toner in a developing device. After that, the polarity is the same as the toner described in 2 (for example, if the previous charge is positive, it is negative)
The visible image is easily 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, developer such as colored particles remaining on the surface of the photosensitive drum after transfer is removed by a cleaning blade, and residual charges are removed by a lamp and a corona discharger, making it possible to repeat the photosensitive drum. By repeating the copying process as described above, a desired number of copies can be obtained.

Conventionally, circuits have been constructed using transistors (referred to as TTL) to control the sequence sequence described above, but TTL has a small noise margin and is extremely susceptible to noise. This is noticeable in products that use high pressure such as. Therefore, as a noise prevention measure, many C filters (filters consisting 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.

Furthermore, control circuits constructed from so-called hard-wired logic circuits and the like have the drawbacks that the complicated control circuit requires a large number of elements due to the jJt structure, which increases the cost and makes it difficult to easily change the sequence control. Ta.

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

Furthermore, when performing copying machine maintenance or assembly, you can check the machine's operation without paper feeding, or perform heat running (
When testing), it is necessary to kill the JAM detection circuit or the paper presence/absence detection circuit (in TTL control devices, each detection circuit is independent, so The operation was complicated.Furthermore, when making the various long and short time timer circuits that are essential for controlling copying machines, individual independent circuits were required, making it expensive to make long time timers. .

The present invention provides an image forming apparatus that eliminates the above-mentioned drawbacks. The present invention also provides a liquid development transfer type copying apparatus that can always obtain good images. Another object of the present invention is to provide an image forming apparatus that can efficiently use an endless photoreceptor and produce stable images, and another object of the present invention is to provide 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 detection according to the size and number of images 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. It is characterized by having a control means CPU which inputs a reference signal and performs sequence control of process processing load based on the contents of memories such as R and OM which store sequence steps for image formation.

Furthermore, in addition to the reference signal, click 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 manually 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 photoreceptor has different photosensitivity characteristics depending on its prior history of light irradiation, and therefore the sensitivity of the photosensitive plate is different 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 the toner is left unattended after printing, 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 stops at a fixed home position, such as the conventional AJ-end photoreceptor, the stopping position is always constant, so the effects of corona charging will accumulate in the same part, and the drum will stop at a fixed position. Since the cleaner is pressed against the drum with considerable 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 evenly over many years and contributes to a longer life of the photoreceptor.

The operation of an exemplary copying machine of the present invention will be explained below with reference to FIGS. 1 and 2. First, when the main switch 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 0Petc) minute, the drum rotates once or almost once
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 you turn on copy button 13, the previous 16 CP will be added plus 3.
The photosensitive drum 15 rotates by the amount of CP, and then the original platen 2 with the original placed on the original platen glass 5 starts, is illuminated by the illumination lamp 16, and its image is reflected on the reflecting mirror 17.
, the drum 15 is exposed at the exposure section 19 by the in-mirror lens 18.
image on top.

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 150, that is, the photosensitive layer, is covered with a transparent insulating layer.
It is fully charged by the corona current from 1. Subsequently, when the light reaches the exposure section 19, the images of the four subjects illuminated by the illumination lamp 16 are slit-exposed onto the photosensitive drum 15, as described above. 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 section is brought into close contact with the photosensitive drum 15, and the image on the photosensitive drum 15 is transferred to the transfer charger 31 by the electric field caused by the pressure from the high pressure source 20. transferred on top. After the transfer, the transfer paper 7 is separated by a separation belt 32 and guided to a drying and fixing section 33. The photosensitive drum 15 is pressed against the blade cleaner 3
The remaining toner developer is wiped off at the edge portion 35 of 4.
Repeat the next cycle again. The developer wiped by the blade cleaner 34 is guided to the developing device 24 through grooves 36 (FIG. 3) provided at both ends of the photosensitive drum 15, and is 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 by the amount equivalent to CP and the drum has rotated by 1GCP + 3CP, this machine uses an endless type drum as the photosensitive drum. for that,
Any surface of the photosensitive drum can contribute to image formation. Therefore, if you want to increase the number of copies per hour by eliminating unnecessary rotations as much as possible, if some toner remains in the blade cleaner edge 35 for the first rotation of the drum, this machine will last for a week, for example. In the worst case, the photosensitive drum dries out when not in use and becomes 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 uppermost transfer sheet in the cassette 6, and by movement with the separation 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. Clock pulse generation FIA j
In response to the document table start signal after j-1 or run 9CP, the document table 2 moves to the left in FIG. 1 in synchronization with the circumferential speed of the photosensitive drum 15 to perform 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 loss time during copying, so it is desirable that it be short. 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, regardless of the copy size.
, the number of copies per unit time is small and the time loss is large. Therefore, this copying machine has a plurality of document table reversal signal generating members 48A, B, and C (FIG. 4) corresponding to each copy size (for example, A4, B5), and a copying cycle corresponding to each copy size. has been changed 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 pause state and restart after close-up photography will be described.

If you leave the power on after all copying operations have been completed, the sensor drum 15 will continue to rotate, and if the high voltage power is on, the sensor drum 15 and blade cleaner 3 will rotate.
4. Not preferable in terms of durability. Therefore, in the copying machine of this embodiment, when a certain copying operation is completed and the next copying operation is not performed even after a certain period of time has passed, the main switch 1
Even if it is ON, the drum automatically stops and enters a rest state. This time is the transferred transfer paper 7
The time is set longer than the time required for the entire surface of the 118 optical drum 15 to be cleaned.

To copy during this pause state, press the copy button 13 of the operation unit 9, and everything will return to the state before the pause, the drum will rotate, and after QCP, the document table 2 will begin to move forward. 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 the copy button 13 is pressed, the potential on the photoreceptor 15 is maintained at a uniform potential by the AC static eliminator 22. Then press the next copy button 13, press 1 charger 30, 10 transfer charger 3
1 enters and the photoreceptor 15 begins to rotate, - charger 30
, the ten transfer chargers 31 are charged to ten, and the potentials after the - charger are neutralized by the ten transfer 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 the image forming area, it will have an adverse effect on the image.

This charger 30 starts from the AC static eliminator 22 where image formation begins.
Converting the distance to the number of clocks, the number of clocks that does not affect the image is 9CP.

FIG. 4 shows the drive system and signal generator.

At the upper end of the rear frame 50 is a control signal magnetic sensing element 4.
8, 71, 72 are fixed to the members 73 and 74. (Figures 2 and 3) Guide rail mounting base 73.
74 has magnetic detection elements 48A, 71, 72.48B, 4
Magnet 1 to which 8C is fixed and attached to document table 2
Control signals are sequentially issued through 61°162. When the copy button is pressed and the document table 2 starts moving forward, the magnet 161 and the element 71 first issue a paper feeding command. Further, the document table moves forward, and the exposure of each copy size (135, A4, B4) is completed, and the magnet 161 moves to element 48A, 48B, or 48C.
When it reaches the top, 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 main morph M is the main morph generation mechanism.

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. u
1. If the machine is not ejected, the machine will be stopped 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 up to the upper left, and the magnet 130 attached to the tip of the lever 181 is also pushed up, moving away from the fixed magnetic sensing element 129 and outputting a signal.

When a jam is detected, it is constant Xi'! Since the J heater is turned off and the main motor M is stopped, the drum 95 is stopped, but the document table 2 is stopped after returning to a predetermined position (home position). When the duct 12 is stopped, the upper cover 127, which can be opened around the hinge 131 in FIG.
Opens vertically with 8. In this state, there is nothing left on the hot plate 124, and if a jam occurs in the fixing section, the transfer paper can be easily removed by hand by opening the upper cover 127. 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. The transfer paper path after the register rollers 41 and 42 is opened when the transfer paper is rotated in the horizontal direction, 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 60 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, the cam 150 provided on the cassette side wall and the micro switch tst (Ms
1), 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 Il+I2. I,,I
8 receives signals from each of the aforementioned magnetic sensing elements, microswitches, etc. as input signal groups. O1～O1
As an output group, a signal for driving a pulse transformer, miniature lamp, solenoid, '11Li clutch, etc. is output from l+.

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 pure input signal group, which input signal is used as a probe signal to be input 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 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
The microcomputer will be explained with reference to FIG. 7.

Figure 7 shows the TEXAS micro-funpiuter TMS-
1000 is an internal circuit block diagram. Among them, ROM
is a read-only memory in which the contents of the sequence shown in Figures 11 and 12, which will be described later, of the copying machine are pre-ordered in code and stored in each address, and the contents can be retrieved each time an address is set.

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

RAM 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. More specifically, as shown in FIG. 8, each bit is constituted by a flip-flop, and a set is selected by an address designation signal, and data is written to or read from a plurality of flip-flops within the set. The address in the RAM at which information is stored is specified by the X register and Y register. The CPU also decodes input data, has an ALU with addition/subtraction logical operation functions to process the data, and a program counter for specifying the address of the instruction stored in the ROM, PC, R, and OM. A page address register PA that specifies a group of page addresses.

Page buffer PB for changing the ROM page, a subroutine is called, execution of the subroutine is completed,
It consists of an accumulator for temporarily storing the ID operation result for decoding the instruction stored in the subroutine return register SJILOM for storing the original return address. Input terminal 1. , 12. I...
i.

is connected to INPUT, and output terminal 0. ~07. is connected to Ol ROVTPvT.

To give an overview, the CPU first specifies the address of R and OM where the sequence is programmed, the contents of the specified address are read into the CPU through the data line, the CPU decodes this, and according to the decoded contents, the power is turned off. In chronological order from input, 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 RAM, and at other times the data is stored at a specified address in RAM. It performs sequence control by inputting data into the CPU, sometimes outputting data in the CPU to the output signal line of the output section, or inputting it into the CPU from the input signal line of the input section. be.

The basic timing for TMSlooO program processing is shown in FIG.

The several μsec clock 0 (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 FLOM address, and at the same time, the program counter PC is incremented by 1.
It takes one clock to decode one program instruction in ROM, one clock to write to ILAM, and if
f' One instruction is completed in 6 clocks. The programmed instructions following the above address are executed at similar time intervals.

(Manual beat) There are a large number of status signals input from the copying machine, and the number of input ports b i of the computer cannot be 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 01-3 and input ports I, -1, and 8.

Table 1 CL K I) is a clock pulse (generated in synchronization with the photoreceptor), PEP is a paper out signal, LEP is a liquid out signal,
C3TP is the copy button, CB HP is the document platen home position, TSC is the toner supply command, PDP is the paper detection signal (transfer paper), B5゜A4, B4BP is the document platen reversal signal for each paper size, MSI, MS2 are the micro switches (
(for paper size detection), JAMK is a JAM detection undetectable signal.

Incidentally, the input gate (1) is 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 reads θ1°θ2 at the time you want to read it. 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
It reads in bit (III211, I8 parallel) and determines 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 is Nantes Gate,
309 is an inverter, and 312 is an OR gate. The terminal numbers of the circuit correspond to the numbers in FIG.

We will use an example to explain how to read data when there is no paper in the cassette and turn on the paper out indicator lamp. This paper out signal comes from the combination of the lamp and light-receiving element set near the cassette installation on the main unit. can get. 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 input 3' of the NAND gate 300 of the matrix circuit becomes O level. On the other hand, 4' of NAND300
Figure 6 Probe signal θ1 from the microcomputer
enters. This PEP signal is read from the input terminal of I2 with θ1 set. Reading of other input signals follows Table 1.

In the control flow, reading paper, etc. is performed at 5TEP in Figure 11.
The command is executed at 5UB2P of 8, and when the program progresses to this 5TEps, a level is set to θ1 every time 5UB2P is passed, and 01 is reset to 0 level immediately after reading is completed. . The time it takes to set this θ1 and complete reading is approximately 60μSeC
It is.

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

That is, since θ1 is now set, NAN in Figure 15
Input 4' of D300 becomes 0 level, and output of D300 becomes l. The NAND 308 (7) output becomes 0 level. This is because the input of 308 ponds, that is, the output of 303, 30
The output of 7 is a level because θ2° and θ3 are not set.

The output 24' line of this 308 is the microphone'ill in Figure 6.
':I is input to the computer and read by the 5UBI, P program. The read data is stored at address 0 BITI (
(hereinafter referred to as (0, 1)). SUB LP determines whether B I T 1 is 0 or 1, and when it is O, outputs a paper out signal as a rubel to 013 in FIG.
32 is turned on, the output of 432 becomes 0 level, and the paper out indicator lamp lights up.

If there is paper in the cassette, the input 3' of 300 in FIG. BITl of the figure RAM 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 of the matrix circuit in FIG. 15 and the logic gate 310 are P P
P, CB I-11), 131) 0J of signal
311 is 0J31 of LEP, TSc, MS 1 signal
3 is CS'l"P, PDP, MS2゜JAMK
It supplies a large amount of signals to the CPU.

The feature of this matrix circuit embodiment is that the document platen reversal signal for each paper size, that is, B5. A4. Input B4 to the OR circuit, and ma) Only one inversion position signal is provided on the IJ sock. Normally, the number of input signals to be controlled should be 11, but in this case, the number of probe signals must be increased by one, and there is a limit to the load to be controlled, so only three can be used as probe signals. It has become.

However, at the same time, we focused on the fact that the document platen reversal signals for different paper sizes cannot be manually input, and developed a method (described later) in which the paper size is stored in the RAM area in the size subroutine, thereby distinguishing the document platen reversal position signal. We are hiring.

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 4o2, inverter 40
5. The circuit consisting of resistor 401, resistor 406, capacitor 403, and capacitor 404 is 5 K H,z
It is an oscillator. This oscillator uses a triac (not shown) in this copying apparatus to drive an AC load such as a main motor, and a pulse transformer is used as the triac trigger. This is an oscillator for driving the triac. Therefore A, N I) Ge) 409,410,
411', 412, and 413 all serve as pulse transformer loads.

Output 52 is the 4-second timer output from the time of power-on as described in OiJ. 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 device motor signal, which outputs a level from when the power is turned on until post-processing starts. Therefore, these ANI) 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, 27 becomes a rubel when the document table moves forward. Therefore, the ANI) 415 outputs a paper feed signal only when the document table moves forward, and when the document table moves backward, a signal is input manually at the same position as when moving forward, but since 27 is at the 0 level at that time, the AND415 The rubel is not output.

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

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

Table 2 Inverter 416 is an all-over exposure lamp (AEXP).

417 is in front of Russia (PEXP).

418 is AC exclusive (HVAC) to the main motor (DILMD).

419 is the document platen advance motor (CBFW).

420 is for I reverse motor (CB 几V).

421 is a ten-form charger, a -charger, a ten-transfer charger (HV
DC), original exposure 5>B (IEXP) 422L/i blank exposure lamp (BgXP).

423 is the developer motor (DVLD).

424): +7-Holt lJ lz -(PHCD
) K.

425 is paper feed clutch, paper feed counter (PESD/CN’l”D) 426 is the toner out indicator lamp (position).

427 is paper (PEL).

428 is liquid (LEL).

429 is the JAM display lamp (JAML).

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 No. 13.1.
As shown in the time chart in Figure 4, the exposure lamp (IBX
I)) The lighting is almost the opposite of that of (I)), 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 is incremented by 1 every time the cNTD signal is output, compared with the set number of copies, and when the number is equal, outputs a copy end signal (copy box off). 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 flowcharts are shown in FIGS. 11 and 12. FIG. 10 clearly shows the outline of power-on, process execution, and standby.

The terms "front rotation" and "back rotation" correspond to pre-treatment and post-treatment of the photosensitive drum surface. The pretreatment wipes away toner adhering to the drum surface and blade, contributing to the formation of a good latent image. Also, post-treatment can remove residual toner on the drum surface before it dries. Also, by operating the charger and leaving it on 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) Following power-on, the power-up reset signal (PU-R8 )make. These four seconds are created by a program. That is, as mentioned above, the number of clocks required to execute one instruction from the instruction group stored in the ROM is six clocks. This clock frequency is set to 300 KHz by O20 shown in FIG. 141J clock time is T=1
/f [seconds], it becomes about 3.3 [μ5ec], and with 6 clocks it becomes about 20 [μ5ec]. Therefore, since it takes 20 [μ5ec] to execute one instruction, a 4-second timer is created using 200,000 instructions. That is, following power-on, RAM area address 1
10 is entered in 5.2, 15.3, and 15.4, and the subtraction of the number 15 stored in RAM area 1 is repeated until it becomes 0. If it becomes 0, subtract j from 15 in IjAM area 2 to make 14. Next, set 15 again to the AM area IK which was set to 0. So again ratio A
Repeat the subtraction in M area 1 until it becomes 0.

Each time it becomes 0, subtract 1 from the contents of RAM area 2, and
, 1 is subtracted from the RAMa area each time the AM2 area becomes 0, and the process is repeated until I (AM areas 1, 2, 3, and 4 all become 0. The number of instructions during this time is about 200,000. The numerical value of the ILAM area is determined as shown in FIG.
As shown in the figure.

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

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

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

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

When the delay time ends, the reset circuit works and starts charging the capacitor again. - If the delay 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, 5TEPI is first executed in the manner described above, and the developing device motor is turned on. (STBP2) This developer motor can also pour developer into the vicinity of the contact between the blade and the drum surface, thereby dissolving dried toner on the reblade and drum and facilitating cleaning in pre-treatment.

Next, it is determined whether or not to disable the JAM detection circuit (hereinafter referred to as JAM killing) at -8 TBPa.

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

Therefore, in this embodiment, if CPI is shorted to ground before power is turned on in FIG. 8, the output of the inverter 210 becomes high level (hereinafter referred to as 1), and the matrix circuit ) Enter 21'. On the other hand, a rubel is input to the IJ rack 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 AND310 is at the level. This is because the 4-second timer is created only by a microcomputer program, so θ1. θ2.
This is because the probe signal is not output at θ3. Then, the output of the NAND 311 becomes the θ 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 TEP38 in FIG. Next, the program proceeds to 5TEP4 to determine whether the aforementioned 4-second timer has timed up, and when the time has expired, the program proceeds to 5TEP5 to turn on the load of the main motor, etc.

In 5TEP6, the LDIDN signal is set at about 90 seconds after the power is turned on by the above-mentioned leaving time measuring circuit shown in FIG.
Since the output is for seconds, the LDE is output 4 seconds after the power is turned on.
The computer reads the N signal and sets a flag on one screen in the RAM.At this time, the photoreceptor has not yet rotated, so the CLK
P is not input.

Furthermore, after the 4-second timer ends, the PUR8 signal of AND201 becomes 0 level, so 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 generated in synchronization with the photosensitive drum. Only the signal of the clock pulse CLKP is input to the computer.

After the 4-second timer ends, the content of the data read in 5TEP6 is determined in 5TEP7, and if the standing time is 7 hours or more, the drum is further rotated with s'rgps, 9 and pretreatment is performed for 40 seconds. During this time, only the load turned ON at 5TBP5 is being driven. If the leaving time is less than 7 hours, the preprocessing 40 second timer will not operate and the 5TEP1
Transition to 0. Here, while the 40 second timer is not up, subroutines 5UBCBRV and SUBL are executed.
[',S[JI3 Execute 5IZE.

This SUB Cl5RV, 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

Even in the step after υ, these 5UB11.0UT
EN is installed everywhere.

The 40 second timer is a clock pulse (CLKP) that is generated in synchronization with the photoreceptor mentioned above (1 clock time is approximately 0.5 seconds).
This is done by counting 80 clocks. When the 40 seconds of processing is completed, 10 cLKPs are counted at 5TEP10.11. As mentioned above, this copying machine performs one revolution of preprocessing regardless of whether or not preprocessing is performed for 40 seconds. 40
If pre-processing is performed for 2 seconds, pre-processing is performed once after this, and if pre-processing is not performed for 40 seconds, pre-processing is performed once after the end of PU S. s'rgp1i 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 5TEPI O and 5TEPI 1. In FIG. 17, 10 clock counts are started at 5TEPIO-1, clock reading is started at STI>1'10-2, and it is determined whether the tarock signal CLKP is a level or 0 level. If CLKP is level +7), proceed to step 10-4 and determine whether the document table is at the normal position (home position) before scanning. If it is not in the normal position, the document platen back motor ON signal (8th
θ6 output) is output. Furthermore, it determines the paper size and monitors the loading of the cassette, and also determines the presence or absence of liquid and displays a notice. 5 TEP if CT, K P is 0 level.
Proceed to IO-7, 5TEPIO-8 and repeat the same process. If CLKP becomes a level again, it means that 1 clock has been counted, so repeat this and get 5 TEPIO.
I counted 10 clocks at -12, but 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 glass is reversed by the reverse position signal, the Baum position is detected, and the document glass back motor is turned off, the document glass still sticks out from the home position (because the user of this machine 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 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 θ 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 the CLKPIO count ends, 5TEI'12 is executed to check whether the copy button is pressed. If the copy button is not pressed, 5TET13.5TE is required to count the remaining 6 clocks of 1 rotation of preprocessing.
PI 4f: Execute. If the copy button has been pressed, the process advances to STE 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.

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

Even during post-processing, 5TEP16 is executed, and when it is detected that the copy button is pressed, the drum rotates twice for post-processing, that is, 32 clocks are counted. If the copy button is on, the process advances to process 5TEP21. When the post-processing is completed, the copying machine goes into standby mode. This is why all loads are turned off in 5TEP19.

During standby, it is necessary to constantly detect whether the copy button is pressed, and this is done in the 5TBP20. Copying machines are often left in this standby mode for long periods of time, but since the temperature inside the machine is higher than the room temperature, toner adhering 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 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, 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 BS 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. When B5BP is confirmed in STEP 26, the SUB TSL routine is performed in 5TEP 27 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 5TEP2
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.

When the paper size is determined in 5TBP28, the size flag is set in the RAM and the flow 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 rlJ. Therefore, it takes a certain amount of time (several hundred m5e) for the document table to pass over the Hall element.
c) is required. 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 A4 size, the fall and rise of the signal of the B5 back position detection Hall element are detected, and for 4 sizes larger than A4, the B5. By detecting the fall and rise of the signal of the Hall element for detecting the A4 inversion position, its passage is determined (STEP 84.85.86). And 5TEP
When it is determined by 87 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 signals CBR and V are outputted by 5TBP88.

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 if the transfer paper ejected by the previous process is staying in the machine, the progress of process 5 TEP is stopped, a stay report is issued, and the next paper is sent. to stop. This is effective during continuous copying.

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

Note that the subroutine TSSD is executed between the determinations of B4BP and the original platen stop position. This routine is 5TEP
The flag set in RAM in the TSL routine of 27 is
It is reset when the developer concentration recovers when executing 5TBP87°90.

Also, the JAM detection PDP2 routine of 5TEP92 is a delayed JAM detection, and since it has been determined in 5TEP89 that the previous sheet is not stuck, this time, the transfer paper that is currently being transferred and is about to be ejected is detected to be jammed inside the machine. Detects cases where the paper is not delivered due to the machine being woken up or due to an error in feeding the paper. That is, when the transfer paper has not reached the JAM detector at the time of 5TEP92, a delay notification is issued and the next paper feed is stopped or the machine is stopped. 5TEP
JAMj at 92, 5TEP9 when it is determined that it is not.
Proceed to step 3 and check the copy button to determine whether to copy one copy or multiple copies. If one sheet of plywood is to be copied, 5TEP94.5TBP95, which counts 7 clocks, is executed. 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, post-processing always begins when 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.

STEP 96 performs a determination that there is no replenishment toner.

It is a routine place. This judgment is S 'I' E B27
When the developer concentration is low at the back position of B5, the flag set when the developer concentration is low is set in STF:B87゜5TFP90 or other SUB TSSD, and when the developer concentration is still low and cannot be reset, the flag is set again just before starting post-processing. If it is determined that the developer is thin, a report will be issued stating that there is no toner.

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.

This is explained in detail in the ATR shown in Figure 19-1.
19-2 is a flowchart of the circuit and FIG. 19-2. 19th
-2 Figure is shown for B5 size. In FIG. 19-1, 5o1 is a circuit for determining the concentration of the developer, and if the concentration of the developer is low, the output of 501 becomes a level. On the other hand, the period in which toner can be supplied is the period from when the original platen moves forward until the end of post-processing. If this toner supply area does not exist, for example,
If the main switch is turned ON and 01i'F repeatedly, a ^sui signal may be output each time.

This is because the liquid concentration is determined by irradiating the liquid passing through the slit with a lamp, receiving it with a light receiving element, and detecting the change in the resistance value of the light receiving element. In this case, turn on the main switch,
Since the lamp lights up before the developer motor starts rotating and the liquid flows into the slit, the resistance value of the light receiving element is small and the liquid concentration is low, and toner is supplied. Then, turn on the main switch,
If FF is repeated, the concentration of the developer becomes abnormally high, which adversely affects the image.

Even if the 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 becomes 1, even though 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 5f enable signal is output. Therefore, the output of the inverter 508 becomes O level for the first time at this time, and the transistor 506 is turned off.
] The output culvert from the device 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 becomes 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
The out-of-toner flag is memorized in the RAM area in the routine, and the flag is not reset in the TS8D routine of 5TEP30.41. After the JAM judgment is completed, when post-processing is started, the TEI of 5TEP50 is immediately before the routine (5TEP96 for B4 size). The RA that was set earlier
The setting of the flag in the M area is determined and a message indicating that there is no toner is displayed.

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

We have just explained one-sheet copying, but in the case of multiple-sheet copying, when the document table reaches the home position and 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 sequence for B4 size, but the sequence is the same for B5 size and A4 size, and the only difference is the JAM detection method, so we will omit the explanation.

The JAM detection method will be specifically explained with reference to FIG. B
In the case of size 5 (Figure 18-1), the document table first reaches the home position at 5TEP30, then proceeds to the routine shown in Figure 12 (■), the clock is counted 5, and the transfer paper is placed on the paper detector 180 at 8TEP45. If it is not determined whether the transfer paper is present or not (the previous sheet has accumulated), 5TEP 48 further counts four clocks and determines whether the transfer paper has reached the paper detector 180. Note that when the signal has been reached, the signal from the Hall element 129 is at 0 level as shown in FIG. 23(C). (Transfer paper delay)
If the transfer paper reaches the paper detector 180, it indicates that the transfer paper is being fed normally.

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

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

In this embodiment, the method of disabling these JAN 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, J
AM kill, liquid kill signal L E l), paper kill, JAM kill, liquid kill, paper kill signal PEP
code the input signal for (ignoring the judgment of , a step is provided to jump this step immediately before the paper discrimination step, and when the program is executed at this step, the RAM
Read the corresponding murder data storage address and check whether the flag is 1 or 0.
When it is 0, the process proceeds to each judgment step, and when it is 1, it jumps the judgment step and proceeds to the next sequence step.

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

When the document table moves forward, the time from when the document table moves forward to the document table inversion position for the longest paper size is fixed, regardless of the paper size, so the timer for this fixed time is set to CLKP.
Make by counting. Therefore, as mentioned above, the paper size flag is
Since it 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 motor mentioned above CLK
It counts P, uses an external low frequency generator, or uses a frequency obtained by dividing the microcomputer drive clock φ.

Table 2 shows an example of the flow shown in Figures 11 and 12 in program code, and the instruction word is TMS 1oo.

This is omitted as it is clear from the 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
The signal driving this circuit so that ooV is supplied is
The aforementioned power hoe 71.1 yen (LD signal). The cleaning blade can be removed from the drum by turning off the PII-LD, and can then be brought into contact with the drum by turning on the power.

Now, if the main switch becomes OI/'F during post-processing and a power hold signal is output, and the power hold signal turns OFF after post-processing, the primary side of the power transformer will turn OFF.
It becomes FF, and the rectifier circuit on the secondary side of the power transformer also becomes OFF. However, since the smoothing capacitor included in the smoothing circuit has a large capacity, the discharge time is long (about several hundred m5ec).

Moreover, there is plenty of room in the operating range of the microcomputer's power supply voltage. Therefore, if the power supply voltage waveform drops in a gentle curve around the voltage at which the microcomputer begins to malfunction, the microcomputer's RAM
, ROM, etc. begin to malfunction. At this time RAM, RO
When the power hold signal is issued by the waist output of M, the main switch is turned off, and the AC 100V line mentioned above becomes active again even though the post-rotation has ended.

In this case, of course, other RAM areas of the microcomputer also contain invalid values, which may cause display lamps such as the JAM display lamp to turn on, thereby adversely affecting 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 Chena 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 is in a conductive state, current flows through the resistor 604, and the collector of the transistor is at approximately 0 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 Chena current supplied to the resistor 611 flows through the resistor 606, a Chena voltage of 16V is maintained across both ends of the Chena diode 612, and a constant voltage of 15V is supplied to the output. However, as described above, the post-processing is completed, a power hold signal is output from the control circuit, and the +24V power supply gradually decreases.

When the +24V voltage approaches 20V, the Zener diode 602 becomes non-conductive, the transistor 605 becomes non-conductive, and the transistor 607 becomes conductive, and the collector of the transistor 607 becomes approximately OV potential.
No Chena current flows through 11, and the output voltage becomes Ov.

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.

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

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

Table 2 OPT LIST, XRE BRLBDDDPAGE
O MNEZ LBCCCBL LBGGGBRLBAA
LBDI]D TCY 4DYN TCMIY 3 MAN TAM LBo+n+ CALLL 5UBSIZEN
EZ BRLBBB CALLL 5UBLPYN DMAN CALLL SUBCCMDTAM MNE
Z MNEZ E! RLB II! 37 BRLBCCBRLB99Et LB997 BL L834 BL LBDD LBAA IYc LB99fl CALLL 5UB
CBRVBLLB5CALLSLIBCNT LBBB IYCTOY 4 MAN BL LB4 TA to LBCCIYc MNEZ BRLBHHH BL LB3 LBAAA CALLL 5UBCNT BL LBB
BBTCY 4 PAGE I DMAN TCY 2 TAM SETR MNEZ TKA BRLBCCCRSTR Tf:Y OLP300 TC:Y 3TAM TCM
IY 4 TBITII LBX TCY 15 BRLBA TCMIY O BROTCY 3 ETN LBA BL LP01 LP301 TCY 2SU
BSIZE ORLBBB 5ETRLBC5ETRTK
A TKA R9TR R5TRTCY 0 TCY OTAM TAM TBITI 3 TBITI 2 BRLB303 BRLP301 TCY, 3 TCY 2 TCMIY2 SETRSRLBX TKA LP303 TCY 3 R5TRTCMIY I TCY OBRLBX TA LBB CLA TBITI3 TCY 3 BRLP300 TAM TCY I TCY 2 SBIT I BRLBC TMA PAGE 2 TDO5UBPDPI TCY I TCY 3 SETR TCMIY OTKA TCY 15 R9TR TCMIYI TCY 0 TCY 3 TAM RETN TBITI 3 BRSUBJAM CALLL 5UBCBRVLBD
RETN TKA LB? 00 CALL'SQBJAM SUBPDP2 BRLBCQ BL L8801LB
CJ 5ETRLBCQ TCY +2TKA TBI
TI 3 R5TRBRLBD TCY OTCY I TAN BRLBCJ TBITI3 LB799 TCY IBRLBD 5
ETR BRSUBJAM TKA SUBJAM TCY I R5TR 5BIT 3 TCY O τ に A TAM TDOTBITI 1 TCY 10 BRLa5O9 SETR, TCY 5 LB800 [IYN 5ETR R5TRBR5UBJA YNEC8La5O11TOY' 5 BRLa8O0R3TR TC:Y 4 BRSUBJAM LB800 R3TRPAGE 3 DYN 5UBCNT TKA YNECOTCY O BRLa9O0TAN BRLB? 99 TBITI O BR5UBCNT LBINTl, CALLSUBSIZELB501T
KATCY 0 CALL 5UBLP TA TBITI O BRLBE TM BRLa5O1TBITI 2 SUBTSSD TCY I BRLBESETRLa
6O0TC:Y 14 TKA MNEZ RSTRBRLBfiol TCY ORETN TAM LBCQ1 TCY I TBITI 2 5RIT O BRLBLLL T to A BRLBE TDO LBLLL TCY 14 TCY 6TC to IY O
RSTR RETN LBE RETN SUBTSL TCY I PAGE 4SETRSU
BCCMD TCY 0 TKA 5ETR RSTRTK^ TCY OR9TR TAM TAM TBITI 2 TBITI 3 BRLa2O2BRLa4O1 TCY 14 La4O0TC:Y 2TCMIY I
' TCMIY 0 RETN BRLBF LB500 TCY 14 La4O1TCY ITC
MIY OTMA RETN ALECI SUB SET TCY I BRLa4O2SETRBRL
a4O0 TKA La4O2TOY 2 R5TRTGMIY I TCYOLBF DYN RETN CALL 5uBLP LB45 TCY 2 SETRCALL 5LIBCBRVTKA TKA R3TRTC:Y 0 TCY OTAN TAM TBITI 0 TBITI I BRLBCK BRLB M BRLBINT2 BRLBNNN LB(:K BLLBRLP LBMMM BL LB4fi LB9000 BL LBINTI LBNNN BL LB47 PAGE 5LBP T
CY 2 Tfl:Y ll5ETRD to AN TKA TA to R3TRMNEZ TCYOBRLBJ TAN BRLBK LB8f18 TBITI 1 Bl'l LB9a9 LBK CALLLStlB BL LBFFF BL LB100OLB9 99 L
[lP 12 5UBCBRV TC:Y IBRO5
ETR LB801 TC:Y OTKA TAN RSTR TBITIOT(”/ O BRLa9O00TAM TBITI 1 LBINT2 CALLL 5UBSIZE BRLB
looTCY 5 SETRRBIT + RETN TMA LBloo TCY 5 TDO R9TRLa2O3RETN ETN SυBLP TCY OLBJ BL LB51SET
RPAGE 6 KA R5TRLB48 CALL 5UBTSSDTCY
O TAM BL LB45 TBITI2 LB47 'TCY 2BRLa2O2
5ETR TCY I TKA SBIT 2 R3TR τ ATCY 0 TDOTAN BRLa2O1TBITI I LB200 TC:Y I BRLB48TM＾ TDOCALL 5IIBTSSD TCY 15 BRLB47 NEZ BRLBJJJ, LB48 C:ALLSUBTS
LLB201 TCY OTCY 8 TB[Tl1SETR BRLa2O2TCY 4 LBJJJ T(:Y l , R5TR5BIT I
TCY 5 TMA 5ETR 0O 8RLa2O3CALL 5UBPDPILB202
TOY, I LB411 TCY 15ETRLP4
0 (:ALLL 5tlBPDP2TKA TCY
ll R5TRTC) IIY 7 TCY O TAM LP41 CALL 5UBCNTTBIT
I I TCY 11 BRLP50 DMAN AM CALLL 5UBTSS口BRLP49 CALLL 5UBSIZELB50
TCY 5 RSTRCALL 5UBLP CALL 5UBPDP2 CALL 5UBC:
CMDTCY II MNEZ TCMIY 7 BRLBM 日RLBO LBS1 CALLSUBSIZE LBOTCY
IINEZ CALLL 5UBLP BRLB42CALLL S
UBccMD CALLL SUB SET NEZ BRLBL BL LBlooO CALLL 5UBCNT LP42 C;ALLL
5UBCBRVCALL 5UBTSSD CALL
L 5UBTSSDLDP 5 BRLB41 BROLP43 TCY 8 5TR LBL BL LBIfl TCY 4PAGE?
5ETR TCY 8 0MAN SETRTAM TCY 5 BRLB34 STR DMAN LP36 CALLL 5UBP[lPIT
AM TCY 4 MNEZ TCMIY 4 BRLP44 LP37 CALL 5UBTSSD CALL 5
UBPDP2 CALL 5UBCNT BL LBP TCY 4 MAN LP44 CALL 5UBTSSD TAM day RL
P43 MNEZ LB to BL LBU6 BRLB37PAGE 8 LP34 TCY6 C^shiLL 5UBPDP2ET
R TC:Y 5 BL LBP RSTRLP38 TCY 6 TCY 8 5ETR R5TRTCY 8 TCY 4 R5TR 5ETP TCY 5 MNEZ R5TR BRLP35 TCY 4 BRLB3. l(5ETR NEZ LB35CALL 5tlBC:NT BRLB3!
IIBL LBP CALL 5UBTSS [1 TCY 4 LP39 CALL SUB (1:NTC
ALL 5UBTSSD Ding AM, LBSTCY
, 4 MNEZ DMAN ORLP33 LB24 AN BRLP38 BL LB40 PAGE 8 TCY 5 LP33 cALt, Lsut+tssn
MAN TAN CALL SUBCBRV MNEZ BRLB32 BRLP01 LP2000 TCY 4NEZ CALLL 5UBPDP2 SRLBS LB25B
RLBT BL LBP LBT CALLL 5UBPDDP2 LB30CALLSUBTSSD CALLL SUB BL LP28 LBY LB31 TCY 5 BL LBlooOLB2”T
CMIY 4 LBZ MNEZ BRLBU LP32 CALLSUBCNT BRLBVCAL
LL 5UBSIZE LBU BL LB12CAL
LLSUBLP LBV BL LBIOLBI TO
Y I CALLSUBCMORBIT +TCY 3 BLLBXORETN LBRTCY 5 DMAN LBQ BL LP43.

BL LP23 LBKKK TC:Y IPAGE
10 5ETR TCY 2 7KA SETRR5TR TKA TCY 0 R3TRTAM TCY OTBITII TAM BRLB27 TBITI I BRLBKKK BRLP24 LP27 TCY 5 BRLBW RSTR CALL 5U BSIZE CALL 5UBSI
ZETBITI 1 BRLBY CALL 5UBLP BL L day 45 CALL 5UBCC:NONEZ CALL SU day TSL day RLB28TCY 5 SETR day L LB31 TCY8LB28TCY5 SETP TCMIY 4 T CY 4 R5TRLP213 CALL 5UBCNTTCY
4 CALL S[IBCNT 5ETRTCY 8 CALLL 5UBCNT RSTR LDP 9 CALLL 5UBCNT BR0 LBW LDP + CALLSUBPDPISR0 PAGE +1 CALLL 5UBLP CALLL
5UBPDPI CALL 5UBCC to DLB20
TCY 2 MNEZ SETRBRL day 985 TKA BRLB9!34 5TR TCY OLP995 BL LB38AM TBITI I LB9!34 CALLL 5UBC
BRVSRLB2+ CALLL 5UBTSSD BL LB2000BR
LB20 LBXOMNEZ BRLBCY LP21 GALLSUBPDP2 BRLBCZB
L LBBBB LBGY BL LB29LB22
Japan L LBAAA LBC:Z BL LBRPAGE
+2 LBBBB CALL 5UBPDPITC:Y 4
CALL 5UBSIZETC: MIY 4 TB
ITI O BRLBI7 LP23 CALL 5UBTSSD BL LB2
4CALL 5OB(:NT LBI7 CALL
5UBTSLTCY 4 LBIII TCY 4 DMAN R3TR TAM TCY 5 ETR CALL 5UBSIZE TC:Y 8ETR TCY I LBEEE CALLSUBCNTSE
TRTCY e TKA 5ETR RSTRCALL 5UBTSSD TCY OTC:Y 5 To TA R3TR TBITII TCY 8 BRLBI8 R3TR Ttl:Y 4 CALLL 5UBTSSD 5ETRBRLBIII
DMAN LB18 TCY 5 TAM R5TRMNEZ TCY 4 Bl? LBEEE TCMIY 2. LDP l 1 R0 LBGGG CALL 3UBTSSD PAGE
13LBIOTCY 3 C:ALL 5UBSIZE R5TRTCY 4 CALL 5UBLP R5TR TCY 10 CALLSUBCGMDLBIIR3TRMNEZ
DYN BRLBI9 YNEC5 BRLBII BL LP01 LBI9 TCY 4 CALLSUBCBRVMA
G IA C:ALL SυBSIZE A TAM CALL 5UBLP CALL SUBcCMD TCY EIETR BLLBZTCY8 LBI2 TC:Y 11 'SETRTCMIY9
7CY 5 LBI3 TOY 3 R9TR ETR TOY? BL LBP LBI4 3ETR IYCLBOOOBL LBIO YNEC10PAIJ +4 BRLBI4 TC:Y II TC:MIY 8 CALL 5UBCNT LB8 CALLL 5UBCBRV CALLL 5UBC:BRV CALL L 5UBSIZE CALL 5UBSIZE CALL 5UBLP CALL 5UBLP CALLL SUBCCMD CALL 5UBfl:CMD NEZ to MNEZ
BRLB! 185 BRLBI5 BRLB984 BL LBlooOLB9B! ; BL LBI2LB
I5 TCY II [IMAN LP884 CALL 5UBCNTT
AN TOY 11 MNEZ IIMAN BRLBI3 7AN LB11i TCY 4 MNEZ SETRBRLB8 LB100OTCY 7 BRLB3000R3TRT
CY 13 TC:Y 13 [IMAN TCMIY 2, TAM TCY El l'1NEZ R5TRBRLB5000 LB5000 TCY II TC:MIY OBL LBOOO LB3000 TOY 9 PAGE +5R5TRL
OP 15 TCY IQ LDX 0 3ETRTCY 10 LBI R3TR CALLL SU CBRV TCMIY OYN CALL 5UBSIZE DYN BRLBI CALLL 5UBLP CLO TCY 9 CALL SUBC CMD SETRMNEZ TC
Y7 BRLB! 393 LB3 TC:NIYIOBRLP
992 LB4 TC)llY15LB993 TCY
10 LB5 TCMIY15RSTRTCMIY
15 BL LBI2 CALLL 5UBCBRVTOY
12 LP992 CALL 5UBCNT, TKAT
OY II TAM IMAN' TCY 10 TAN LB8 DMAN MNEZ TAM MNEZ BL LBIfl BRLee END lYN MAN TA to LDP O BR0 LBDD TOY I+ TCMIY 10 TCY 3 ETR TCY 7 ETR TCY 8 ETR TCY 8 5TR LB7 BL LBINTI LBRLP CALLL 5UBCBRVCALLL
5UBSIZE CALL 5UBLP TCY 11 D to AN TA NEZ 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, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a first cross-sectional view, and FIG. Figure 5 is a perspective view of the cassette, Figure 6 is a control circuit diagram, Figure 7 is a block diagram of the microcomputer, Figure 8 is a RAM area diagram, Figure 9 is a basic time chart of the microcomputer, and Figure 9 is a basic time chart of the microcomputer. Figure 10 is a system flowchart of the operation of the copying machine in Figure 1, Figures 11 and 12 are detailed flowcharts of Figure 10, Figure 13 is an operation timing chart for B5 size, and Figure 14 is an operation timing chart for B4 size. , 'J
'S l 51A is the input matrix circuit IA, the 16th
The figure is an output control circuit diagram, 171N is a clock level, 0
Rehel control flowchart, Figure 18-1 is B5 size jam detection flowchart 1, Figure 18-2 is B4 size jam detection flowchart.
Size jam detection flowchart, Figure 18-3 is a jam detection timing chart, Figure 19-1 is ATR
Flow chart, Fig. 19-2 shows the ATR circuit, Fig. 20 shows the clock generation diagram, Fig. 21-1 shows the measurement circuit when left unused, Fig. 21-2 shows the operation time chart of Fig. 21-1, and Fig. 2
Figure 2 shows a power supply circuit, and Figure 23 shows an example of the human power sensor circuit in Figure 6. I4. I8 is an input terminal to the computer, 01 to 015 are output terminals to the computer, A4BP, B4BP, B5BP are document platen reversal position signals, MSI, 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. Time O ■■ Figure 1 fj-1 E35 4 (a) Shishi (b) 4 Introduction 3! 1 JAM JAM (C) (a) (b (C) Figure ?/-1 Figure ?△? Figure Procedure Supplementary Device (Spontaneous) 4 Commissioner of the Patent Office Mr. Manabu Shiga J, Indication of Case 1988 Patent Application No. 112859 2 Name of the invention Image forming device 3 Person making the correction 1 Relationship with the scale 1 Patent applicant Location 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (+0
0) Representative of Canon Co., Ltd. Ryu Nagara 3rd Department 5, application subject to amendment and specification 6, contents of amendment (1) Amend the application as per the attached sheet. (2) Delete the 8th line on page 4 to the 2nd line on page 6 of the specification. (6) In the 5th line of the 6th page of the same page, ``furthermore'' should be amended with ``In the above-mentioned device,'' Delete line 9 on page 11. (5) In front of line 10 on page 11, it says, ``The present invention eliminates the above drawbacks and makes it possible without providing a complicated input section.'' 2. Claims A plurality of process means for image formation, an input means for inputting data necessary for image formation in order to form a desired number of images, control means for sequentially controlling said process means in accordance with input data from said key manual means, said control means having means for operating said process means in a predetermined sequence without predetermined control; Use data input means in parallel 5
An irl image forming apparatus characterized by: November 29, 1980 Manabu Shiga, Commissioner of the Patent Office Patent Application No. 112859 2, Name of invention Image forming device 3, Person making the amendment Relationship to the case Patent applicant address 330-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. Representative: Kaku NV 3 Section 4, Agent Address: Canon Co., Ltd., 3-30-2 Shimomaruko, Ota-ku, Tokyo 148 (Wt story 758-2111) 5. Date of amendment order: October 30, 1980 (shipment date) 6. Specification and drawings subject to amendment (contents subject to change)

Claims (1)

[Claims] a plurality of process means for image formation; an input means for inputting data necessary for image formation to form a desired number of images; and a control means for sequentially controlling the process means according to the method, and the control means has means for operating the process means in a predetermined sequence without predetermined control, and is characterized in that it is performed in parallel with the data input means. Image forming device.