JPS58198059A - Method for carrying paper in electrophotographic recorder - Google Patents

Abstract

PURPOSE:To instantaneously discriminate jams on plural sheets of recording paper put on a carrying way at a fixed interval, by dividing the carrying way into plural sections and providing the titled device with plural carrying means and detecting means to detect recording paper on plural positions in the carrying way. CONSTITUTION:The carrying way from a paper feeding part 1 to a stacker part 12 is divided into plural sections and recording paper taken out from the paper feeding part 1 sheet by sheet is successively carried by the 1st-5th carrying means 2, 4, 6, 9, 10 and guided to the stacker part 12. In respective carrying ways, the 1st-5th detecting means 3, 5, 8, 11 to detect the recording paper are arranged on prescribed positions. If the recording paper stops on the carrying ways and generates a jam, a control circuit discriminates parts of which operation is to be stopped from parts of which operation is to be continued and controls respective parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding system implemented in an electrophotographic recording apparatus, and particularly relates to recording paper jam control.

In an electrophotographic recording device, in order to increase the recording speed, it is necessary to shorten the time for forming an image on a photosensitive drum and to narrow the interval between images, and accordingly, it is necessary to shorten the conveyance interval of recording paper. Therefore, a high-speed electrophotographic recording apparatus has a structure in which a plurality of recording sheets are present on a conveyance path from a paper feed section to a stacker section.

However, in the case of such a structure, if the recording paper jams in the middle, there is a problem that the subsequent recording paper that is continuously fed at regular intervals gets jammed and an unexpected accident occurs. For example, if a jam occurs in the pressure fixing device, recording paper may get mixed into the pressure fixing device, disabling the fixing function, or locking the drive, causing the motor to generate heat. If a jam occurs, there is a risk that the photosensitive drum will be damaged by subsequent recording paper.

Therefore, in order to prevent such accidents from occurring, conventionally,
The occurrence of a jam is monitored by a means that detects whether the recording paper has arrived within a predetermined time.According to this, if the recording paper jams at the detection means, it is determined that the jam has been detected if the paper has arrived within the predetermined time. Then, when the next recording paper is detected, it is detected that it has not arrived within a predetermined time and it is determined to be a jam, so it is impossible to determine a jam in a short period of time, and there is a drawback that proper jam handling cannot be performed. Ta.

Further, according to the above-mentioned means for detecting arrival within a predetermined time, jam detection may not be performed at the recording paper ejection section.

Furthermore, since the location of the jam is unclear, the only way to minimize damage caused by the jam is to stop all processes at once and have the operator take out and check the recording sheets one by one, which places a burden on the operator. There were various drawbacks, such as an increase in the amount of time required to stop the apparatus, and a waste of recording paper.

The present invention has been made to eliminate these drawbacks, and it is possible to instantly detect a jam in a plurality of sheets of recording paper that are present at regular intervals on a conveyance path, and also to detect jams in each device according to the position where the jam occurs. The purpose is to obtain a paper feeding system that can control the operation of the paper and prevent accidents from occurring.To achieve this purpose, the conveyance path is divided into multiple sections, and
Using a plurality of transport means for transporting the recording paper and a plurality of detection means for detecting the arrival and passage of the recording paper within a predetermined time,
If the recording paper is detected by the detection means at a plurality of positions on the conveyance path and a jam occurs, the conveyance of the recording paper beyond the occurrence place is continued, and the conveyance of the recording paper after the occurrence place is stopped. It is characterized by the following.

To explain the following with reference to the drawings, FIG. 1 is a schematic diagram showing an embodiment of the present invention, in which 1 is a paper feed unit that supplies recording paper before recording, 2 is a first conveyance means, and 3 is a first detection unit. means,
4 is a second conveyance means, 5 is a second detection means, 6 is a third conveyance means, 7 is a third detection means, 8 is a fourth detection means, 9 is a fourth conveyance means, 10 is a fifth conveyance means, 11 is the fifth detection means, 1
Reference numeral 2 denotes a stacker section that stores recording sheets after recording has been completed.

In this embodiment, the conveyance path from the paper feed section 1 to the stacker section is divided into a plurality of sections, and a first conveyance means 2 using rollers, a feed belt, etc., so that the recording paper is fed in each section; Second conveying means 4, third conveying means 5, fourth conveying means
A conveyance means 9 and a fifth conveyance means 10 are provided, and the recording sheets taken out one by one from the paper feed section 1 are sequentially conveyed by these first to fifth conveyance means to the stacker section 12.
It is designed to lead you to.

Then, the first detecting means 3, the second detecting means 5, the third detecting means 7, the fourth detecting means 8 and the fifth detecting means 11 are respectively set at predetermined positions so as to detect the recording paper at a plurality of positions on the transport path. It is located in

A photosensitive drum 13 is located between the second conveyance means 4 and the third conveyance means 6, and is supported to rotate at a constant speed. A portion 15, a developing device 16, a transfer charger 17, an erase lamp 18, and a cleaning portion 19 are each arranged in a predetermined positional relationship.

20 is a pressure fixing device provided between the third conveying means 6 and the fourth conveying means 9, and 21 is a paper width detecting means provided in the paper feeding section 1.

Although not shown, the present invention has a plurality of counters for jam determination connected in series with each other in relation to each of the above-mentioned conveyance means and detection means.

Next, the above-mentioned operation of Benisei will be explained with reference to the time chart shown in FIG. First, when the permission signal for the printing operation shown in FIG. Fuser 2
0, second conveyance means 4, third conveyance means 6, fourth conveyance means 9
and the fifth conveying means 10 respectively operate.

When a predetermined period of time has elapsed, a signal indicating completion of recording operation preparation shown in FIG. The output is as shown in Figure (C). This activation signal causes the first conveying means 2 to
is activated, the first sheet of recording paper is sucked and fed from the paper feed section 1, and after being checked for jam by the first detection means 3, it is conveyed by the second conveyance means 4, and then the first recording sheet is fed. When the recording paper undergoes a jam check by the second detection means 5, a signal indicating that data transfer can be accepted is issued at the same time. As a result, data is transferred from the terminal control side, an electrostatic latent image is formed on the photosensitive drum 13 by the optical writing section 15, and toner is supplied from the developer 16 to this electrostatic latent image to form a toner image. be done.

On the other hand, the recording paper that has been checked for jam by the second detection means 5 is sent between the photosensitive drum 13 and the transfer charger 17, where the toner image is transferred onto the recording paper by the transfer charger 17. . Thereafter, the recording paper is conveyed by the third conveyance means 6, and after being checked for jam by the third detection means 7, it is sent to the pressure fixing device 20, where the toner image is fixed on the recording paper by the pressure fixing device 20. Ru. Further, the recording paper undergoes a jam check by the fourth detection means 8, is conveyed by the fourth conveyance means 9 and the fifth conveyance means 10, is jam checked by the fifth detection means 11, and enters the stacker section 12. be accommodated in.

The suction of the second recording paper begins after the first recording paper passes through the first detection means 3, as shown in FIGS. Means 2
If the activation signal has been received, this operation is performed by the first conveyance means 2, and the jam check during conveyance is performed in the same manner as for the first sheet of recording paper described above.

The photosensitive drum 13 after the toner image transfer is irradiated with an erase lamp 18, and the remaining toner is removed from the IJ-ning section 19.
will be collected.

In the above-mentioned operation, in the present invention, if the recording paper stops on the conveyance path for some reason and a so-called jam occurs, the control circuit (not shown) will act according to the jam occurrence section as shown in Table 1 below. It determines which parts should stop operating and which parts should continue operating, and controls each part.

In Table 1 above, stop means the operation is stopped, continue means the operation continues, and 'ro means the first transfer means is started within tQ time after starting the first conveyance means.
When the detection means does not detect the recording paper, T1 is when the second detection means does not detect the recording paper within t1 time after the first detection means detects the recording paper, T2 is the second detection means detects the recording paper. T5 is when the third detection means does not detect the recording paper within a time t2 after the detection, and T5 is when the fourth detection means does not detect the recording paper within a time t after the third detection means detects the recording paper. , TI+ is tl, while the fourth detection means detects the recording paper.
When the fifth detecting means does not detect the recording paper within one hour, T5 is when it takes more than t5 hours for the recording paper to pass through the fourth detecting means, and T6 is when the recording paper does not pass through the fifth detecting means. When the temperature exceeds t6 hours or more, the following is shown.

Therefore, for example, if the recording paper stops midway between the second detection means 5 and the third detection means 7, the jam occurrence time is °'
T2'', the first conveying means 2, the second conveying means 4, the third conveying means
The operations of the conveying means 6, the photosensitive drum 13, the negative charger 15, and the transfer charger 17 are stopped, and the conveyance of the recording paper following the jammed recording paper is stopped. On the other hand, the pressure fixing device 20, the third conveying means 9, and the fourth conveying means 10
continues its operation until the recording paper preceding the jammed recording paper is discharged into the stacker unit 12.

In addition, the said time tO-t6 is set as follows. That is, as shown in the time chart of FIG. 3, to is the time it takes for the recording paper to move from the first conveyance means to the first detection means, and tl is the time it takes for the recording paper to move from the first detection means to the second detection means. t2 is the time required for the recording paper to move from the second detecting means to the third detecting means, t5 is the time required for the recording paper to move from the third detecting means to the fourth detecting means, and ti is the time required for the recording paper to move from the second detecting means to the fourth detecting means. The time it takes for the recording paper to move from the fourth detection means to the fifth detection means, t5 is the time it takes for the recording paper to pass through the fourth detection means, t6
is the time during which the recording paper can pass through the fifth detection means.

Jam detection in the present invention is carried out by starting υ counting by a counter (not shown) from the time when the first conveyance means 2 is started or from the time when a designated detection means detects recording paper.
A method of determining whether or not the next detection means detects recording paper when a predetermined number of counts is counted, and a method of starting sicant by a counter after a designated detection means detects recording paper,
A method is also used in which it is determined whether or not the same detection means detects the last recording sheet when a predetermined number of recording sheets are counted.

That is, in the above example, the jam occurrence time is To
-T11 is detected using the former method, and when the jam occurs at T5 or T6, the latter method is used.

In addition, when the above-mentioned operation is realized using a microcomputer, it is preferable to store the contents shown in Table 1 above and other control programs in the ROM.

In addition, when handling recording paper of different sizes, the size of the recording paper is detected in advance by the paper width detection means provided in the paper feed section 1 shown in FIG.
It is preferable to change the times t5 and t6 shown in the figure.

As explained above, the present invention divides a conveyance path into a plurality of sections, and in each section, a plurality of conveyance means for conveying the recording paper, a plurality of detection means for detecting arrival and passage of the recording paper, and a plurality of detection means for detecting a jam are provided. Since a counter is installed to detect jams, it is possible to determine the occurrence of a jam reliably and instantaneously, as well as detect the location of the jam.This allows the recording paper that precedes the recording paper that caused the jam to be continued. At the same time, it is possible to perform control to stop the conveyance of the recording paper following the jammed recording paper. As a result, it eliminates the need to stop all processes9 and retransmit data as in the past, reduces the burden on operators, and reduces waste of recording paper, among other benefits. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG. 2 is a schematic diagram showing an embodiment of the present invention.
A time chart explaining the operation of the conveying means in the figure,
FIG. 3 is a time chart showing the timing of jam detection. 1... Paper feeding section 2... First conveying means 3... First
Detection means 4...Second conveyance means 5...Second detection means 6...Third conveyance means 7...Third detection means 8
...Fourth detection means 9...Fourth conveyance means 10...
・Fifth conveyance means 11...Fifth detection means 12...Stacker section 13...Photosensitive drum 17...Transfer charger 20...Pressure fixing device 21...Paper detection means Patent applicant Oki Denki Kogyo Co., Ltd. Patent Attorney Takashi Kanakura Procedural Amendment (Kae) September 8, 1980 Patent Office Commissioner Kazuo Wakasugi Tono 1, Indication of the Case 1980 Patent Application No. 080102 Relationship to Case Patent Applicant 6, subject of amendment Specification “Detailed Description of the Invention”. 7. Contents of the amendment (■) Page 9 of the specification is amended as shown in the attached sheet. 390-9-

Claims (1)

[Claims] 1. In an electrophotographic recording apparatus in which a plurality of recording sheets are continuously conveyed at regular intervals on a conveyance path from a feeding section that supplies recording sheets before recording to a stacker section that stores recording sheets after recording, a plurality of transport means for dividing the transport path into a plurality of sections and transporting the recording paper in each section; a plurality of detection means for detecting arrival and passage of the recording paper within a predetermined time on the transport path; A jam determination counter connected in series with the conveyance means and the detection means is provided, and when a jam is determined, the recording paper that precedes the jammed recording paper is continuously conveyed, and the jammed recording paper is continuously conveyed. A paper feeding system in an electrophotographic recording apparatus characterized by stopping the conveyance of a recording paper following a recording paper that has been loaded.