JPS5999451A - Method for controlling copying machine and the like - Google Patents

Abstract

PURPOSE:To execute both the discriminating of the first and the second states of pulse signals necessary for control of the timing of processing devices and to carry out copying control high in accuracy in the case of control using memory storing the sequential control program of copying. CONSTITUTION:A CPU designates the address of an ROM2 having a sequential program, the contents of the designated address are fed through a data signal line 6 to the CPU, and decoded by the CPU. In accordance with the decoded contents, the sequential programs which exist in successive operations in the time series by turning on a power supply are processed as follows: CPU itself processes them in the inside, they are stored in the designated address of an RAM3, the data of the RAM3 are fed to the CPU, and the data in the CPU are delivered to each processing device to control it. The H and L level states of the clock pulse A for controlling the action timing of the CPU are discriminated from each other in the CPU to form a timing signal for controlling each device in accordance with the result of discrimination. Consequently, pulses fed at short intervals can be counted exactly, and highly accurate control can be accomplished.

Description

[Detailed description of the invention] The present invention relates to a sequence control method for copying machines and the like.

First, an example of a copying machine to which the present invention is applied will be explained in terms of a copying process. FIG. 1 is a schematic diagram of a transfer type electronic copying machine, and its operation is as follows. The surface of the photosensitive drum 10 having the photosensitive member 2 (consisting of a conductive layer 2-1, a photoconductive layer 2-2, and an insulating layer 2-3) is first uniformly pre-charged ( For example, the light image irradiation lamp 19. The optical image is scanned and projected onto the lens 4, and at the same time, the recharger 5 removes the charge with alternating current or direct current with the opposite polarity to the previous charging, thereby forming an electrostatic latent image corresponding to the brightness of the optical image. Further, the latent image is entirely exposed to light by a lamp B to form a high-contrast electrostatic latent image, which is visualized by a developer mainly containing toner in a developing device 7. Thereafter, the visible image is easily transferred to a post charger 8 that generates a corona discharge with the same polarity as the toner (for example, negative if the pre-charge is glass), and is further transferred to a conductive roller 9 and conveyed. The image is fixed onto the transfer material by the heater 11. On the other hand, the developer such as colored particles remaining on the surface of the photosensitive drum after transfer is removed to the cleaning roller 12, and the residual charge is removed from the rung 1.
4 and a corona discharger to obtain the desired number of copies.

Conventionally, in this type of copying machine, sequence control has been performed using switch signals from a cam provided on the photosensitive drum.

For example, when the drum rotates and the cam D activates a relay, the document table 18 starts moving, the cam F drives the paper feed roller 15 to start feeding paper, and the cam J warns of a mistake in ejecting the paper 10. It is something.

For this reason, when there is a large number of process processing equipment, such as color copying, a large number of cams and corresponding switches are required, making maintenance and inspection difficult due to the complex mechanism, and malfunctions due to chatter of switches and relays. This resulted in a decrease in reliability.

Furthermore, because of the complicated control circuit configuration, many elements are required, which increases the cost and has the disadvantage that the sequence control cannot be easily changed.

The present invention aims to eliminate such drawbacks by providing a read-only memory for programming and storing data, inputting copy start and status signals from various parts of the processing equipment, controlling processing, and sequentially executing the above programs. This allows sequence control of the copying machine.

By using the present invention, it is possible to program the sequence of the copying machine recording device in chronological order, and this makes it possible to change the sequence extremely easily.

Furthermore, this method has the advantage of allowing a high degree of circuit integration and greatly reducing the number of parts.

Furthermore, this method has the feature that sequences for different copying machines can be created by using the same circuit and changing only the program.

More specifically, Fig. 2 shows one or more registers for address designation, one or more other registers for primary storage, a decoder for data input from the data signal line, and a decoder for processing data. Data processor CPU with adder/subtractor and logical operation functions.

A RAM is a read-only memory that stores fixed information and can write data to or read data from a plurality of selected flip-flops. That is, the control sequence of the copying machine is programmed in advance and stored in ROM or RAM.
A circuit for inputting one or more status detection signals of the copying machine to the input/output section, and a circuit for making each of the one or more output signal lines of the output section correspond one-to-one with each individual load ( 6th
(Fig.), a circuit (6th circuit) that causes the CPU to output a signal code for setting/resetting one or more flip-flops 22 to the output signal line and makes the output of the flip-flop 22 correspond to the load 24 of the copying machine. Decoder 20 in the figure
), the outputs of the status detectors 25 of the plurality of copying machines are encoded by the encoder 21, and the sequence is controlled by a circuit (FIG. 6) which inputs the encoded signals to the input signal line of the input section.

First, the CPU specifies the address of the ROM in which the sequence is programmed, and the contents of the specified address are read into the CPU through the data signal line 6, and the CPU decodes it.
According to the decoded contents, data is processed within the CPU itself when it is in chronological order from power-on, and when it is p, R, AM, the data in the CPU is stored in a specified address in RAM. C
The data input into the PU is sometimes outputted from the CPU to the output signal line 8 of the input/output section, or the contents on the input signal line 9 of the input/output section are input into the CPU. The above is the data spread in the present invention: 0, Q1=1,
02=0, 03=0 Please latch. Now turn on the motor. Furthermore, the counter in the CPU is counted up every time clock pulse B arrives, and when it reaches O, 0o = 1, 01 = 1.02 = 0, 03 = 1 is set to C.
The heater that was output from the PU and started is also turned on. Thereafter, in the same manner, timings as shown in FIG. 4 are formed.

A concrete flowchart of such output signal formation is shown in FIG. That is, the sequence is determined by sequentially counting clock pulses from the start of copying and determining the timing of the count value.In this example, up to clutch operation control is shown, but the flowchart is the same as this flow until the end of copying. Sequence control is executed by

Incidentally, even for various types of copying (color, multiple copies, etc.), the sequence is similarly executed according to the flowchart shown in FIG. The color judgment in FIG. 7 is to judge whether it is three full colors or one color, and when it is three colors, the photosensitive drum front idling VRI.

VB2 'T: The same process as the copying process described above (only the combination of filter and developer is different) is repeated for each of yellow YO, magenta MO, and cyan CO.

Mode judgment is to select which color is 1.
This allows the process to be executed only once. When performing multiple copies, it is determined whether or not copying is stopped based on the number of copies counted, and when the copying is stopped, the set state of starting copying after the drum is canceled. Selection control of devices operating in process modes such as MMC is possible by associating a flowchart similar to that shown in FIG. 5 with each process mode.

The copying machine is equipped with a so-called microprocessor, memory, and input/output means, and the input means is connected to each state detection section of the copying machine.
Since the output means corresponds to the equipment that executes process processing, etc., the sequence can be easily changed by changing the program, and it becomes possible to obtain a large number of general-purpose control devices for copying machines. In addition, in the present invention, CPU, aoM, mA
M is well known

[Brief explanation of the drawing]

Figure 1 shows the control section of a conventional copying machine 4F4j. The figure is an operation timing chart of equipment in a copying machine, FIG. 5 is an operation flowchart of equipment according to the control method of the present invention, and FIG.
MX RAM is a memory, and 1/θ is an input/output section. Applicant Canon Co., Ltd. No. 1 and 1b and Cram School No. 7 Procedural amendment (voluntary) August 6, 1980 Commissioner of the Patent Office Kazuo Wakasugi 2 Name of the invention Control method for copying machines, etc. 3 Relationship with the person making the amendment Patent applicant Location 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. Representative Ryu Kaku 3-30-2 Agent Residence 146 Shimomaruko 3-30- Ota-ku, Tokyo 2 Canon Co., Ltd. (Telephone: 758-2111) 6. Specification subject to amendment 6. Contents of amendment (1) Lines 6 to 17 of page 4 of the specification are corrected as follows. "On the other hand, a method has been reported in which the copy sequence is controlled using a memory that stores a copy sequence control program (I B B E NQ121974). However, a method that uses a hard counter to count the pulses to form the timing control signal has been reported. Therefore, the configuration of the control circuit becomes complicated.The present invention eliminates these drawbacks and provides a control method for a copying machine, etc., which has a simple configuration and high control accuracy. It has a read-only memory that stores the operation sequence program of the processing equipment for processing, an input/output unit that inputs pulse signals necessary for timing control of the processing equipment and outputs operation control signals to the processing equipment. In a method for sequence control, in which status signals and the above-mentioned pulse signals from various parts of the device are inputted, discriminated and sequentially executed, the above-mentioned program is sequentially executed. 0118, line 818 is changed to ``At the same time as pulse B becomes H level, that is, in FIG. 5, the level changes from H to level.'' (4th step), L-)H level change (5th step), and correct the error in the CPU. 6) In the second line of page 11, ``Additionally,'' was changed to ``Also, since the present invention forms a timing control signal by both the first level state determination and the second level state determination of the input pulse signal, short intervals can be achieved. This allows you to accurately count the repeated manual pulses without mistakes, increasing the accuracy of timing control. Procedural amendment (method) % formula % 1 Indication of case 1981 Patent application No. 125857 2
Name of the invention Control method for copying machines, etc. 3 Relationship with the person making the amendment Patent applicant Location 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. 5, Date of amendment order November 1980 29th of May (shipment date) 6. The drawings subject to amendment 7. Contents of amendment

Claims (1)

[Scope of Claim] A sequence control method for a copying machine or the like that advances a recording process to obtain a recorded material, comprising a data processor, a read-only memory that stores an operation sequence program for a processing device for processing the recording process, and the processing device. It has an input/output section that inputs pulse signals necessary for timing control and outputs operation control signals to the processing equipment, and inputs copy start, status signals from various parts of the processing equipment, and the pulse signals mentioned above, performs discrimination processing, and sequentially processes them. In a method of sequence control by executing the above program, both the first level state and the second level state of the pulse signal are determined in order to form a timing control signal for sequence control. A method for controlling a copying machine, etc., characterized in that: