JPS5821263A - Control device for inputting and outputting of copying machine or the like - Google Patents

Abstract

PURPOSE:To prevent the stray running of a driven device surely despite the presence of abnormlity on the microcomputer side by connecting the driven device and a detector in parallel with the input/output port of a control system. CONSTITUTION:A driven device 1 and a detector 2 are connected in parallel with an input/output port 4. When the detector 2 goes on during the execution of programs by a microcomputer CPU3, the port 4 is set ''0'' and the device 1 is turned off irrespectively of the output from the CPU3. As a result, the strary running of the driven device 1 is surely prevented despite the presence of malfunction, trouble, delay in processing time, etc. on the side of the CPU3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input/output control device for a copying machine or the like incorporating a microcomputer.

Conventionally, the control system of a copying machine or the like that incorporates a microcomputer is configured as shown in Figure 1, for example. When input to the interrupt detector i of the computer C, the central processing unit d is set to temporarily suspend the process being executed at that time. Then, depending on the type of the interrupt signal, the interrupt processing program stored in advance in the memory C is sequentially retrieved, and while temporarily stored in the random access memory f, the arithmetic processing is executed.
The processing result is output from the driven device group gK of the camera body a)
h, and each driven device group g is controlled by this output. Furthermore, when a plurality of signals from each detector group, for example (a) and (b), are simultaneously input to the interrupt detector l, they are processed in sequence according to a preset priority order. However, when there are many inputs that require high-speed processing, the above method requires multiple external interrupt terminals to be installed depending on the number of manpower, which increases the size of the device, and when multiple interrupt signals that require time are input at the same time. , there is also a problem that processing of signals other than priority signals is delayed.

Moreover, when a specific fail-safe detector operates, it is necessary to promptly output an output signal to the driven device group g) K--but if there is a delay in the response time as described above, There were also some problems, such as not being able to achieve its purpose.

This invention was made for the purpose of improving this problem, and is capable of high-speed processing and input/output control of copying machines, etc., which prevents the driven device from running out of control even if there is a failure or malfunction on the microcomputer side. The aim is to provide a device to improve safety.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. 2 and below. FIG. 2 shows a case in which a glue scan clutch such as a copying machine is used as a driven device 1, a rescan end switch is used as a detector 2, and these are connected in parallel and controlled by a microcomputer 3# of the control system. When the start switch (not shown) is turned on (FIG. 4A) to start copying, the input/output boat 4 connecting the microcomputer 3, driven device 1, and detector 2 is set to "1".
Then, the driven device 1 is turned on and exposure is started. When a certain period of time has elapsed after the start, the detector 2 is turned on, and from this point on, the wrinkle drive device fill is turned off and the exposure is stopped.

In addition, the signal from the detector 2 input to the input/output port 4 is taken into the central processing unit 5 by a command signal from the central processing unit 5, and the central processing unit 5 uses this signal to store its processing content in advance. are read out from the read-only memory 6 and temporarily stored in the random access memory 7, and are sequentially deepened when the output command becomes an output command.

However, in the above operation, even if the detector 2 is turned on, if the driven device i is not turned off due to malfunction, failure, processing time delay, etc. on the microcomputer 3 side, the exposure optical system goes out of control and hits the frame etc. There was a risk of damage.

In addition, it is necessary to restore the exposure optical system at high speed after exposure in order to increase the copying speed, so it is possible to set the detector 2 to turn on early, but this method does not allow the exposure Since problems such as the optical system not returning to the predetermined position may occur, it is desirable to install the detector at an appropriate position. Therefore, in this invention, the driven device 1 and the detector 2 are connected in parallel to the input/output capacitor 4. The input/output port 4 is set to rOJKL and the driven device [1 is turned off.As a result, the microcomputer 3 side 1
c Even if there is a malfunction, failure, processing time delay, etc., the driven device 1 can be prevented from running out of control, and the detector 2 can be installed at an appropriate position, so no problems will occur.

The above operation is shown in a flowchart in FIG. 3. It goes without saying that the driven device I is not limited to a squirting clutch, but can also be used for a registration clutch or other device that requires high-speed processing. Further, the detector 2 is not limited to a switch, and an optical detector such as a photointerrack or a detector such as a Hall element may be used.

As described in detail above, this invention connects a driven device and a detector in parallel to the input/output ports of the control system, and stops the driven device by a signal from the detector. Even if there is a malfunction, breakdown, processing time delay, etc., you can be sure that the driven device will not go out of control! It will be possible to prevent this.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a conventional device, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a p-chart showing the same operation, and Fig. 4 is a tie chart. . 1 is a driven device, 2 is a detector, and 4 is an input/output port. Applicant Fuji Xerox Co., Ltd. Kanto Kinshadai Patent attorney Masaaki Yonehara Patent attorney Tadashi Hamamoto

Claims (1)

[Claims] Detect by connecting the driven device 1 and the detector 2 in parallel to the input/output boat 4 of a control system commonly used in copying machines, etc. An input/output control device for a copying machine or the like, characterized in that a group of driven devices is stopped by a signal from s2, and the signal is input to a control system via an input/output boat 4.