JPS60221772A - Transfer paper carrying controlling method of copying machine - Google Patents

Abstract

PURPOSE:To reduce a down-time of a machine by executing a copying operation by using other transfer paper carrying path without operating only a transfer paper carrying path in which a transfer paper jam has been generated. CONSTITUTION:In case a red and black mode is selected, and transfer paper fed out of an upper feed paper cassette 45 does not reach a paper detecting sensor 52 within a prescribed time, it is decided to be a transfer paper jam, the copying operation is stopped and a jam generation is displayed on an operating panel. In this case, a full black mode copying for using a lower cassette 46 can be executed, therefore, when an operator selects the full black mode and the lower cassette, the copying becomes available, and the full black mode copying from the lower cassette 46 can be executed. In this case, the jam display can be turned off, and also by flickering the jam display, it can informed to the operator that a jam is being generated at present.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a transfer paper conveyance control method for a copying machine. In particular, the present invention relates to a transfer paper conveyance control method for a copying machine having a plurality of transfer paper conveyance paths.

(Prior Art) Normally, when a transfer paper jam occurs in a copying machine, copying operations are prohibited regardless of the position of the jam. For example, in a copying machine with two paper feed cassettes, if a jam occurs in one paper feed path, copying operations are completely prohibited even if the other paper feed path can be used. .

In such cases, especially if it is difficult for a general operator to remove the jammed paper, copying operations cannot be performed until the jammed paper is removed by a full-time operator or a skilled person such as a service person. , there are inconveniences such as not being able to make urgent copies in time.

(Purpose) The present invention has been made in view of the drawbacks of the conventional examples, and is aimed at reducing machine downtime.

The object of the present invention is to provide a transfer paper conveyance control method.

(Structure) The control method of the present invention will be explained below based on the illustrated embodiment.

FIG. 1 shows a schematic configuration of an electrophotographic copying machine according to the present invention.

A document placed on a document table is exposed by an exposure lamp, and the light image passes through a lens 1 and reaches a half mirror 2. The half mirror 2 divides the light beam into a first beam directed toward the first photoreceptor drum 86 and a second beam directed toward the second photoreceptor drum 7.
It is divided into light beams.

The first light beam transmitted by the half mirror 2 passes through the mirror 5 and forms an image on the first photoreceptor drum 6, for example, the photoreceptor drum 11 for red. On the other hand, the second light beam reflected by the half mirror 2 passes through mirrors 3 and 4 and forms an image on the second photoreceptor drum 7, for example, a black photoreceptor drum.

Each mirror is arranged so that the optical path lengths of the first beam and the second beam are substantially the same.

Around the first photoreceptor drum 6, there are a primary charger 8, a secondary charger 9, an exposure position 10, an erase device 11, and a development device 1.
2. A cleaning device 15 and a dielectric belt unit 13 are arranged J-L. Utilizing the difference in spectral sensitivity of the photoconductive layer of the photoreceptor drum, an electrostatic latent image of only a red image is formed, and a developing device A transfer charger 14 visualizes the image using a red developer 12 and transfers it to a transfer paper conveyed by a dielectric belt 13.
Transcribe by. After the transfer, the first photosensitive drum 6 is cleaned by the cleaning device 15 in preparation for the next copying operation.

On the other hand, around the second photoconductor tram 7, a charging device 16,
Exposure device 17, Illumination device 18, Development device@19, Transfer charge 20, Separation charge 21, Cleaning device 2
2 is arranged to form an electrostatic latent image of only a black image, which is visualized by the black developer of the developing device 19, and the dielectric belt 1
The transfer charge 20 transfers the image onto the transfer paper conveyed by the transfer paper 3.
(not limited to color).

As described above, the implementation system of this example has a first photoreceptor drum (Se-OPC composite photoreceptor) and a second photoreceptor (Se'-
It is a two-color color copying machine consisting of a photoreceptor).

These include an all-black mode that reproduces the original as a black-and-white copy like a conventional copier, a red-black mode that reproduces the original as a two-color copy of red and black, an all-red mode that reproduces the original as an all-red copy, and an all-red mode that reproduces the original as an all-red copy. Red erase mode that erases red information,
A total of five modes are provided including a black erase mode for erasing the black mode in the document. In addition, in the case of the first all-black mode, this system puts the first photoreceptor drum 6 and the surrounding process elements in a non-operating state,
The paper is also transported through a completely different route.

The main reason for doing this is the difference in sensitivity between the first photoreceptor drum and the second photoreceptor drum 7, which impairs the amount of copy production in all-black mode that can be achieved by using only the second photoreceptor drum 7. This is because there is no

As a result, there are at least two process speeds in the all-black mode and other modes. In the case of the implementation system of this example, the process speed (also referred to as the circumferential speed of the photoconductor drum) at high speed in full black mode is approximately 1
Process speed at 80 mm/sec, red mode and other low speeds is approximately 90 iIn/see.

Next, the transport path of the transfer paper will be explained.

First, in all-black copy mode, the copy paper is placed in the lower paper feed cassette 4.
5 (or the lower paper feed cassette 46) to the upper paper roller 47.
Upper separate roller 48. Upward berth roller 49. (In the case of bottom paper feeding, the bottom paper roller 58, the bottom separate roller 59
．． It is sent out from the downward berth roller 60) and reaches the relay roller pair 53. At this time, the switching claw 50 is positioned below (indicated by a broken line) and guides the copy paper (transfer paper).

After that, the leading edge of the copy paper is detected by the paper detection sensor 54, further passes through the relay roller pair 55, the leading edge of the copy paper is detected by the paper detection sensor 57 before registration, and then reaches the lower register roller pair 56. (For bottom feeding,
After reaching the relay roller pair 61, the leading edge of the copy paper is detected by the paper detection sensor 62 (hereinafter the same as lower paper feeding), and here, the paper detection sensors 54, 57, and 62 detect the paper feeding timing at a predetermined paper feeding timing. The sensor is configured to detect the behavior of the paper and feed back a signal to the control system. Further, after the paper position is detected by the paper detection sensor 57, the upper picture paper roller 47 (lower paper feeding roller 58) stops after a predetermined time required for reaching the lower registration roller pair 56.

Timing is determined so that the operations of the paper feeding system described above and the developed image on the second photosensitive drum 7 are synchronized at the leading edge of the paper, and the lower registration roller pair 56 is operated to transfer the developed image on the drum to the paper. .

In other modes, copy paper is stored in the upper paper feed cassette 45.
The paper is sent out from the upper feed roller 47, the upper separate roller 48, and the upper reverse roller 49, and then the upper registration roller pair 5
Arrive at 1. At this time, the leading edge of the paper is detected by the paper detection sensor 52, and after that detection, the upper registration roller pair 51
After the predetermined time required to arrive at , the overprint paper roller 47 stops. At this time, the switching claw 50 is positioned upward (indicated by a solid line) and guides the copy paper.

After a predetermined amount of paper feeding is completed, timing is determined so that the developed image on the first photosensitive drum 6 and the paper are synchronized, and the resist roller pair 51 is operated to transfer the developed image on the drum to the paper. Thereafter, the transfer paper conveyed by the dielectric belt 13 reaches the second photosensitive drum 7, and a predetermined developed image is transferred thereto.

Next, a control method when a transfer paper jam occurs will be explained.

Currently, the red/black mode is selected and the upper paper feed cassette 45
If the transferred paper does not reach the paper detection sensor 52 within a specified time, it is determined that there is a paper jam, the copying operation is stopped, and the occurrence of the jam is displayed on the operation panel. In this case, all-black mode copying using the lower cassette 46 is possible, so when the operator selects all-black mode and the lower cassette, copying becomes possible and all-black mode copying from the lower cassette 46 can be performed. At this time, the jam display may be turned off (in this case, if the upper cassette is selected again without removing the jammed transfer paper, the jam display may be turned on), or the jam display may be made to blink to indicate that a jam is currently occurring. It is also possible to notify the operator of this.

Further, control may be performed so that the all-black mode and the lower cassette are automatically selected when the jam occurs.

On the other hand, if the all-black mode is selected and the sketch paper set 1-
If the transfer paper sent out from the paper cassette 46 does not reach the paper detection sensor 62 within a specified time and it is determined that there is a paper jam, all modes are possible if the upper cassette is used.

In this way, if there is a transport path that can be used when a jam occurs, machine downtime can be reduced by providing a flexible mechanism that enables copying operations using that transport path.
Furthermore, if a copy mode in which copying is possible is automatically selected when a jam occurs, operability will be further improved.

It goes without saying that depending on the location where the jam occurs (for example, in the fixing section), copying may not be possible unless the jammed paper is removed.

FIG. 2 is a block diagram of a control circuit according to the present invention.

The control unit 63 is mainly composed of a CPU and a RAM.

It consists of R'OM, I10 interface, etc. On the input side, a combination of magnets attached to the paper feed cassette selectively turns on the lead SW provided on the main body side, and sends a 4-bit binary signal to the control unit as a cassette size determination signal. A feeding cassette detection unit 64, a paper detection sensor 52 installed on the transfer paper conveyance path.
54.57.62 and a paper discharge sensor, a separation error detection sensor that detects the transfer paper that has been separated and wrapped around the photosensitive drum;
A sensor unit 65 consisting of a home position switch and a registration switch for detecting the position of the scanning optical system, a lens position detection sensor, a sensor for detecting the position of the erase lamp light-shielding plate, etc., and 0N10FF of each process means.
A timing pulse unit 66 that generates a pulse synchronized with the rotational speed (linear velocity) of the photoconductor drum, which serves as a timing reference.
, an operation key portion 67 arranged on the operation panel includes a numeric keypad, a cassette selection key, an interrupt key, a print key, and a copy mode selection key.

On the other hand, on the output side, a lamp regulator 68 for always keeping the exposure lamp voltage at an appropriate level, a toner concentration control 69 for keeping the developer concentration at an appropriate level, a motor,
There are an AC/DC load 70 consisting of a clutch, a throttle, etc., a high-voltage power source 71 for various chargers and developing bias, a fixing temperature control 72 for controlling the temperature of the fixing heater, and display units 73 arranged on the operation panel.

FIG. 3 is a flowchart showing an example of jam processing. If jam (2) occurs during paper feeding from the lower paper feeding cassette 45, all modes and non-feeding power set 1- are automatically selected. Jam also occurs when jam (2) occurs ■
Select all black mode and lower paper cassette in the same way as when . If a jam (■) occurs, copying is prohibited because there is no usable transport path.

Also, a jam occurs during paper feeding from the lower paper feed cassette 46.
If a jam occurs, the transport path from the lower paper feed cassette to the dielectric belt 13 can be used, so the lower paper feed cassette is automatically selected, and since all 5 copy modes are possible, the mode The selection is left to the operator.

Although the above example describes a jam in which the transfer paper does not reach the paper detection sensor 52, 54, 57, 62, similar control can be performed for a jam in which the transfer paper remains in each sensor section.

Here, jam ■ is a jam that does not reach the paper detection sensor 52, jam ■ is a jam that does not reach the paper detection sensor 54, jam ■ is a jam that does not reach the paper detection sensor 57,
The jam value) is a jam that does not reach the paper detection sensor 62.

(Effects) As described above, according to the transfer paper conveyance control method of the present invention, machine downtime can be reduced.

Furthermore, if a copy mode in which copying is possible is automatically selected when a jam occurs, operability will be further improved.

[Brief explanation of drawings]

FIG. 1 is an internal mechanism diagram of a copying machine according to the present invention, FIG. 2 is a control block diagram of the entire copying machine, and FIG. 3 is a flowchart of operation of transfer paper conveyance control according to an embodiment. 1 Figure 2

Claims (1)

[Claims] (1) In a copying machine having multiple transfer paper conveyance paths, only the transfer paper conveyance path in which the transfer paper jam has occurred is made inoperable;
1. A transfer paper conveyance control method for a copying machine, characterized in that a copying operation using another transfer paper conveyance path is possible. (2. A transfer paper conveyance control method for a copying machine according to claim (1), characterized in that when a transfer paper jam occurs, an available transfer paper conveyance path is automatically selected.