JPS60260966A - Copying machine - Google Patents

Abstract

PURPOSE:To shorten the first copying operation time after removing jammed paper and to prevent stains in a copying machine by stopping a rotary photosensitive body when trouble is detected in the copying operation, returning a scanning means for exposing an original to a home position, and then, stopping it. CONSTITUTION:A mobile stand 2 placing an exposure lamp 2 and a mirror, a mobile stand 3 placing 2 mirrors, and an exposure optical device 5 including a projection lens 4 are arranged above a photosensitive drum 1 rotated in the arrow direction. The image of an original placed on an original platen glass 6 is formed on the drum 1 with the device 5. A detector 101 for detecting the presence of the device 5 in the home position is installed and its output is fed to a control circuit for controlling the drive of the device 5 and the drum 1, and when this circuit receives the signal of a jam detector for detecting poor separation of the transfer paper from the drum 1, said circuit stops the drive of the drum 1 and returns the device 5 to the home position and stops drive of the device 5, thus permitting the first copying operation time to be shortened after jammed paper is removed, and stains in the machine to be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a copying machine or the like, and particularly to a drive control device for a document exposure and scanning means.・[Technical background] Conventionally, in electrophotographic copying machines, when an abnormality is detected in the copying process, the rotating body and original are exposed and scanned in order to prevent component damage and easily and safely eliminate the cause of the abnormality. The reciprocating means and the reciprocating means are immediately stopped. However, with this method, when the cause of the abnormality is eliminated and the copying operation is restarted, the home position is different from the home position.The time required for the first copying operation after returning to the home position is required. This has the disadvantage that not only is the process longer, but also the rotating body is operated at this time, resulting in dirt inside the machine and deterioration of materials.

[Purpose of the invention]

This invention was made to eliminate such drawbacks, and when an abnormality in copying work is detected, the rotating body is immediately stopped, but the reciprocating means for exposing and scanning the original is
After returning from that position to the home position, the copying A stops and steps are provided to shorten the working time for the first copying operation when normal copying operation is resumed, and also to eliminate unnecessary use of the rotating body. This is intended to prevent the interior of the machine from getting dirty and the materials deteriorating due to operation.

[Structure of the invention]

Hereinafter, an example of an electrophotographic copying machine to which the present invention is applied will be explained based on the drawings.

FIG. 1 shows the internal structure of an electrophotographic copying machine. Above the photosensitive drum 1, which is driven to rotate in the direction of the arrow, is a first movable base 2 equipped with an exposure lamp and a mirror. Two mirrors are mounted. An exposure optical device 5 including a second movable table 3 and a projection lens 4 is positioned, and the exposure optical device 5 forms an image of the document on the document table glass 6 onto the circumferential surface of the photoreceptor drum 1.

Whether this exposure optical device is in the home position or not,
It is detected by the i-th microswitch +01.

Around the photosensitive drum 1, a charging electrode 7, a developing device 8, a transfer electrode 9,
A separation electrode 10 and a cleaning device 11 are arranged, and image processing is performed by these process devices. Also, at the left end of the aircraft frame A, there is a feeding roller 12←→←h.
← Spiders were attached ← 1 Reiji Paper Feeding Stand 13 ← Divine Poems were installed, and by the method described later - C oh, XI□tins ~ was constructed. , Wow, Wow. Edict.

is supplied to the circumferential surface of the photoreceptor drum 1.

After that, the recording paper X onto which the toner image has been transferred is transferred to the conveyor
After being transferred to the fixing device 16 and having the toner image fixed thereon, it is taken out of the machine by the action of the paper ejection roller device 17.

FIG. 2 is a block diagram showing a control device that controls the exposure optical device and the drive of the photoreceptor drum.

A home position detector 101 is connected to the control circuit 100 for detecting whether or not an exposure optical device for exposing and scanning a document exists at the starting point of scanning, that is, a home position.
and a door that detects the opening/closing status of the opening/closing part of the copier.
1: When a signal indicating that the opening/closing section is open or a jam has occurred is sent from the open detector 102 and the jam detector 103 that detects failure to separate the transfer paper from the photosensitive drum. Then, the control circuit 100 enters the abnormality handling routine and outputs a drive stop signal to the photosensitive drum drive unit 31 through the photosensitive drum drive circuit 121. In addition, a signal to return to the home position is output to the exposure optical drive unit 132 through the exposure optical system drive circuit 22, and the home position detector 101 notifies that the exposure optical system has returned to the home position. Upon receiving the signal, it outputs a drive stop signal to the exposure optical device drive section 132. The contents of the abnormality handling routine are shown in a flowchart as shown in FIG. In addition, ■ in Figure 3
~■ indicates each step of the flowchart.

First, in step (2), a drive stop signal is output to the photoreceptor drum drive circuit, and in step (2), the input signal to the exposure optical device drive section is determined. If the exposure optical device return signal is input, the process proceeds to step (2). to determine whether the exposure optical device is at the home position, and if the exposure optical device is not at the home position, output an exposure optical device return signal until the exposure optical device returns to the home position. do.

If the exposure optical device forward signal is input in step ■, an exposure stop signal is output in step ■, an exposure optical device return signal is output in step ■, and the position of the exposure optical device is determined in step ■. It is determined whether the exposure optical device is at the home position, and if the exposure optical device is not at the home position, an exposure optical device return signal is output until the exposure optical device returns to the home position.

This content is shown in a time chart as shown in Fig. 4.

If there is an abnormality detection signal S5 from the door open detector 102 or the jam detector 103 when the exposure optical device is sent, the exposure optical device signal S2 and the exposure signal S are stopped, and the exposure optical device return signal S3 is output. Output. Then, a signal S6 indicating that the exposure optical device has returned to the home position is received, and the exposure optical device return signal S3 is stopped. Furthermore, when the exposure optical device returns, if there is an abnormality detection signal S5 from the door open detector 102 or the jam detector 103, the exposure optical device return signal S3 continues to be output, informing that the exposure optical device has returned to the home position. The signal S6 is received and the exposure optical device return signal is stopped.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when an abnormality in the copying operation is detected, the copying machine is controlled so that the document exposure optical device, which is not directly related to the abnormality, is returned to the home position and then stopped. By doing so, it is possible to shorten the work time for the first copying operation after eliminating the cause of the abnormality, prevent dirt inside the machine, and prevent material deterioration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the electrophotographic copying machine according to the present invention, FIG. 2 is a block diagram showing the control device, @3 causes is a flowchart showing the contents of the abnormality handling routine, and FIG. 4 is the 70 in FIG. 3.
- A timing chart showing control details using a chart. Figure 4 U7t5 NU Bamboo Satoki ltlt, Ltshi<ijo, Sujite56' 1 □

Claims (2)

[Claims] (1) A rotary photoreceptor, a scanning means for exposing and scanning a document, a first driving means for driving the scanning means, a second driving means for driving the rotary photoreceptor, and the 1i and second driving means for driving the rotary photoreceptor. The first and second driving means are controlled so that when an abnormality in the copying operation is detected during driving by the means, the driving of the rotary photoreceptor is stopped and the scanning means is stopped after returning to a home position. A transfer type copying machine having a control means. (2) A copying machine according to claim 1, wherein the fact that the transfer material cannot be separated from the rotating body is detected as an abnormality in the copying operation.