JPS62216002A - Image forming device - Google Patents

Abstract

PURPOSE:To contrive reduction of the cost and the attachment space of parts by attaining both input and output through a single terminal. CONSTITUTION:The LEDs 1-8 usually perform the prescribed displays according to the programs stored in a ROM of a microcomputer 3. When a switch 6 is closed to switch the input/output terminal connected to the microcomputer 3 to the input side, the voltage of terminal port N connected with the LEDs 1-8 are set at +V. Then the LEDs 1-8 are turned off. Thus the port N can be used as an input port by means of input terminals P1-P8.

Description

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

In recent years, with the spread of microcomputers, general-purpose input/output LSIs that can be used for both input and output are being used for control and display of copying machines. For example, in Figure 1, 1 is a microcomputer.

2 is a general-purpose input/output LSI that connects a set of 8 input/output boards to 3
I have one. The general-purpose input/output LSI 2 is controlled by the microcomputer 1, and input/output is selected by the control signal, such as, for example, boat 1 is input, boat 2 is output, and boat 3 is output. Boat 1. boat 2, boat 3
Input/output of data to/from is performed through a data bus.Usually, each port of such a general-purpose input/output LSI is set for input only or output only. However, there are cases where it is not possible to increase the number of general-purpose input/output LSIs due to cost or space constraints for mounting parts.

The present invention provides a means for feeding a recording member, a plurality of processing means for forming an image on the recording member, a signal output means for driving the processing means or for displaying the operating state, the processing means or To share the signal input means for commanding the operation or detecting the operating state of the feeding means, the output means, and the input means, and select input/output for output and input as necessary. In the image forming apparatus ELζ having means for selecting the input/output, terminals normally used for output such as display are used for input, and the above problem is solved. It is something to do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 2 shows an output port for displaying various process statuses and sequences, which is shared by a boat for inputting various detection signals and command signals, and 3 shows an 8-bit parallel process for controlling process sequences and displays. Microcombiners 21 and 4 are 8-bit digital-to-analog converters (hereinafter abbreviated as D/A converters) that convert digital signals into analog signals and contribute to the voltage output of the high voltage transformer. 6
is a switch for switching the input/output terminals of the input/output LSI, and when it is off, it is used for output, and when it is on, it is used for input. The output and input operations of the general-purpose input/output L8I4 and the D/A converter 5 are controlled by the microcomputer 3. LBDI
~LHDB is a light emitting diode for process display and voltage +
It is driven to turn on by V. R1 to R8 are current control resistors, and 81 to S8 are microswitches for inputting input terminals PI-P8J. LEDI～L
ED8 does not light up when the voltage of the connected terminal boat N is equal to the pull-up voltage +V, but lights up when it is lower than +V.

Normally, the LFJD1 to LED8 perform arbitrary display, such as contrast display, according to a program stored in the ROM of the microcomputer 3.

If you want to check or adjust each part of the gc box, use the microcomputer 3 (or general-purpose input/output LS).
By closing the switch 6 for switching the input/output terminal connected to I4) for input, iD1 to LIim
Set the voltage of the connected terminal baud)N of D8 to +V. This allows LEDI to IJD8 to be turned off,
Therefore, the boat N can be used as an input port using the input terminals P1 and P2. In this case, switch 8
Desired P1 to P8 can be set by turning on any one of P1 to S8.
The input from the input/output terminal enters the general-purpose input/output LSI 4. P1-P8
If any of the input values from the terminals is at a low level, one of the corresponding LEDs I to ID8 lights up, so the input value can be confirmed. Furthermore, the microcomputer 3 reads this input value into the OPU, processes it for judgment, operates the D/A converter 5, and operates any part of the device based on its output, for example, outputs a corona high voltage. Therefore, a service person or operator can calibrate the output voltage by looking at the development caused by the output.

When such an input/output circuit is used in an image forming device, a display circuit is connected to the terminal of the input/output circuit, and usually a desired display is made to detect troubles such as jams, out of paper, or out of toner. At times, it is also possible to change a switch using a relay or the like, input this trouble signal from this terminal, perform necessary control, and display the trouble on a display circuit.

Further, it is also possible to output a signal from a terminal of the input/output circuit to a device drive unit such as a motor, and when the trouble is detected, switch can be switched using a relay or the like to stop the signal supply to the device drive unit.

Also, if you use key input as input, such as inputting the number of copies, and operate a sequence load as output, you can link the switch to the copy button and open the switch when the copy button is pressed, so that the same terminal can be connected. It is also possible to input the number of copies, press the copy button, switch the terminal to output, drive the sequence load in sequence, and repeat this a set number of times to obtain the set number of copies.

FIG. 1 is a sectional view of a copying apparatus to which the present invention is applied.

The surface of the drum 11 is made of a three-layer photoreceptor using an ODS photoconductor, is rotatably supported on a shaft 12, and starts rotating in the direction of an arrow 13 in response to a copy command.

When the drum 11 rotates to the normal position, the document platen glass 1
4 is irradiated with an illumination lamp 16 that is integrated with a first scanning mirror 15 , and the reflected light is scanned by the first scanning mirror 15 and the second scanning mirror 17 . By moving the first scanning mirror 15 and the second scanning mirror 17 at a speed ratio of 1:1, the original is scanned while the optical path length in front of the lens 18 is always kept constant.

The reflected light image passes through the lens 18, the third mirror 19, and the fourth mirror 20, and then forms an image on the drum 11 at the exposure section 21.

The drum 11 is charged with a charge @ (for example, +) by a negative charger 22.
After that, in the exposure section 21, the image illuminated by the illumination lamp 16 is subjected to slit exposure.

At the same time, a static eliminator 23 is used to remove static electricity of the opposite polarity (for example, -) to the AC or - next page, and then the entire surface exposure lamp 2
4, a high-contrast electrostatic latent image is formed on the drum 11. The electrostatic latent image on the photosensitive drum 11 is then visualized as a toner image by the developing device 25#0 cassette 26-1. Or transfer paper 27- in 26-2
1 or 27-2 is the paper feed reeler 28-1. Or it is sent into the machine by 28-2 and is sent to the inside of the machine by the 28-2
1 or 29-2, accurate timing is determined by the second register roller 30, and the recording material is sent toward the photosensitive drum 11.

Next, the transfer paper 27 is passed between the transfer charger 31 and the drum 11.
The toner image on the drum 11 is transferred onto the transfer paper while the drum 11 passes through the transfer paper.

After the transfer is completed, the transfer paper is guided to the conveyor belt 32 and further to the pair of fixing reels 33-1, 33-2, where it is fixed by pressure and heating, and then discharged onto the tray 34.

After the transfer, the surface of the drum 11 is cleaned by a cleaning device 35 made of elastic solade, and the process proceeds to the next cycle.

36 is a jam detector that outputs a jam signal when a sheet is not detected at a predetermined time, which is composed of a photoelectric element, etc.;
7.38 is a paper detector that detects the presence or absence of copy paper in the cassette and outputs an output when there is no paper, which is composed of a light [element, etc.];
Reference numeral 9 denotes a toner detector comprised of a photoelectric element or the like that detects the amount of toner in the developing device and outputs an output when the developing device is empty.

By inputting the signals from these detectors to the OR gate in the block circuit diagram shown in FIG. 4, necessary control can be carried out when a trouble is detected, and the trouble can be displayed.

In Figure g4, 1 to 6 are the same as in Figure 2. Ml is a relay that turns on the motor that rotates the drum, OL is a relay that turns on the paper feed roller 28-1, EX is a relay that turns on a lamp and scans the mirror system, 7 is 01 (, gate, 8 is a relay that opens and closes the changeover switch 6. In this case, trouble signals such as jam, out of paper, out of toner, etc. are input to the P1 to P8 terminals and are also input to the OR gate.The output from the OR gate is switched. The relay 8 is activated to open and close the switch 6. For example, if a jam occurs, this trouble signal (high level) is input to the OR gate 7, and the output (high level) from the OR gate 7 is sent to the changeover switch 6. The relay 8 that opens and closes is operated, and the changeover switch 6 is closed.As a result, boat N is used as an input boat.
A trouble signal from the input terminal P1 enters the general-purpose input/output LSI 4 as an input, and the microcomputer 3 judges this input and operates a relay or the like to perform control such as stopping the device. Also, since the input from input terminal P1 is at a high level, LBDI does not light up and jams.
It can be seen that this has occurred. Ml.

OL and EX do not operate because their outputs are off, and the high voltage output of 5 is also lowered to 0 and becomes inoperable. The same applies to cases where there is no paper or no toner.

As described above, the present invention uses the terminals of a human output circuit, such as a general-purpose input/output LSI, which is normally used for output, as input, and input and output can be performed using the same terminal. Therefore, the cost and space for installing parts can be reduced.The display circuit operates in response to the input, so the input value can be confirmed.Also, trouble signals can be input to perform necessary control and display troubles. It has the following characteristics.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a general-purpose input/output LSI controlled by a microcomputer, FIG. 2 is a block circuit diagram explaining the invention in detail, and FIG. 3 is a cross-section of a copying machine to which the present invention is applied. 4 are control circuit diagrams when the present invention is applied to a copy IT. Ru0 Teitouriuchi 1] Seisho (method) 1. Display of the case 1985 Patent Application No. 229081 2, Name of the invention Image forming device 3, Person making the amendment Relationship to the case Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100)
) Canon Co., Ltd. Representative Ryuzo Kaku
Part 4, Agent's residence 3-30-25 Shimomaruko, Ota-ku, Tokyo 146, Date of amendment order (shipment date) February 24, 1986 6, Drawings subject to amendment 7, Contents of amendment

Claims (1)

[Claims] A means for feeding a recording member, a plurality of processing means for forming an image on the recording member, a signal output means for driving the processing means or displaying an operating state, the processing means or the feeding means. A signal input means for issuing operation commands or detecting the operating state of the device, a means for sharing the above-mentioned output means, and a means for selecting input/output for output or input as necessary. An image forming device having: