JPS60220367A - Copying device - Google Patents

Abstract

PURPOSE:To continue the operation until a recording paper which can be carried is carried to a position just before a fixing and paper ejecting device, by detecting the moving time of the carried recording paper with plural sensors and timers connected to them to control operations of driving systems which drive a recorder and the fixing and paper ejecting device of a copying device respectively. CONSTITUTION:The copying operation is performed by cooperative actions between the part of the recorder which is driven by a motor M1 as the first driving system and the part of the fixing and paper ejecting device driven by a motor M2 as the second driving system. With respect to operations in the recorder, there are exposure scanning of an original D due to the first and the second mirror units 1a and 1b of an optical system 1, rotation of a photosensitive drum 2, and individual operations of an image forming process related to them, namely, driving of a developing device 4 and a cleaning device 5, actions of individual electrode groups 3, driving of a carrying-out roll 6, a resist roll 7, and a carrying belt which carry the recording paper, etc. With respect to operations in the fixing and paper ejecting device, there are driving of a fixing roll 11 and driving of a paper ejecting roll 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus in which driving functions of each device in an electrophotographic copying machine or the like are improved.

[Prior art]

In most conventional copying machines, the various devices provided therein are driven by a single drive system, that is, by a single motor.

In such a copying machine, even if a local jam occurs in the recording paper being transported and the paper in the corresponding conveyed area is removed to clear the jam, the operation of the entire copying machine must be stopped and the paper inside the machine must be removed. The jammed recording paper will have to be removed along with all the recording paper.

On the other hand, the copying speed of copying devices has gradually increased, and especially in copying devices equipped with flash exposure devices, the exposure of the original can be extremely short. Therefore, when making multiple copies of the same original, it is necessary to make copies at close intervals. Since the image is copied using the copying machine, many sheets of recording paper are being conveyed at the same time.

Therefore, even when dealing with a local jam, it is necessary to remove all of the large number of recording sheets from the copying device, which requires a lot of effort and time, and it becomes very time-consuming to resume copying.

In particular, in the recording device part, that is, the process part from supplying and transporting the recording paper to image formation and transfer, where many conveyance rollers are intricately assembled in a narrow space, making it the most difficult part to remove the recording paper. Furthermore, when removing the recording paper around the photoreceptor drum, the photoreceptor may be scratched, which may interfere with subsequent copying.

There is also a copying apparatus in which the recording device and the subsequent fixing/discharging device are driven by independent drive systems, but in conventional copying devices, both drive systems are commonly controlled, so it is difficult to It is not possible to stop only one drive system.

[Purpose of the invention]

According to the present invention, even if the operation of the copying apparatus is stopped to handle a jam in the fixing and discharging device of the copying device, the recording paper that can be conveyed by the recording device is transported to just before the fixing and discharging device. The object of the present invention is to provide a copying apparatus that can continue to operate until the copy is completed.

[Structure of the invention]

The present invention detects the travel time of the recording paper conveyed by a plurality of sensors disposed in the conveyance path of the recording paper in a copying apparatus and a timer connected to the sensor, and based on the result, the recording device and the fixing It is configured by controlling the operation of the drive system that drives each paper ejecting device, and it consists of a recording device that records images on recording paper, and a fixing paper ejection device that fixes the recording paper with the recorded image and then ejects it. In a copying apparatus in which the fuser and ejector are driven independently, if a recording paper transport accident occurs in the fusing and ejecting device, the drive system that drives the fusing and ejecting device is automatically stopped, and the recording paper is This is achieved by a copying apparatus characterized in that a drive system for driving the recording apparatus is automatically stopped after the recording paper in the apparatus is conveyed to just before the fixing/discharging apparatus.

〔Example〕

An embodiment of a copying apparatus according to the present invention is shown in FIGS. 1 to 3.

The copying operation in the copying apparatus shown in FIG. 1 is performed by a portion of the recording device driven by a first drive system, which is a motor M1, and a portion of a fixing and discharging device, which is driven by a motor M2, which is a second drive system. The recording paper carried out from the paper feed cassette 71.C transfers the image on the document paper and is then discharged to the paper output tray T, completing one cycle of copying. There is.

In other words, the operation of the recording device is as follows:
Exposure scanning of the original document by the first and second mirror units la and 1b, rotation of the photosensitive drum 2, and other operations of the image forming process, that is, driving of the developing device 4 and cleaning device 5, and operation of each electrode group 3. In addition, there are a carry-out roller 6 for carrying out the recording paper from the paper feed cassette C, a registration roller 7, and a drive for a conveyance belt 8 for conveying the recording paper to a fixing and discharging device after image transfer.

On the other hand, the operations of the fixing/discharging device include a fixing roller 11 that fixes and conveys the toner image on the recording paper conveyed by the conveyance belt 8, and a fixing roller 11 that fixes and conveys the toner image on the recording paper conveyed by the conveyance belt 8; There are various drives for the paper ejection roller 12.

In the present invention, for a copying apparatus having a drive range divided in this way, in addition to the sensor Sl that detects the completion of copy preparation of the copying apparatus or detects the open state of the exterior part,
Sensors S2 and S4, such as photo sensors, are placed at important points along the path where the recording paper is conveyed normally, and sensors S3, such as photo sensors, are placed at important points where there is a risk that the recording paper may be conveyed incorrectly. Sensors S2, S3, and S4 can all detect the presence of recording paper, and the information from sensors S2 and S4 is connected to a timer in the control unit so that the time required to convey the recording paper can also be detected. .

Next, the functions of the drive system, that is, the operation control of the motors M1 and M2 in the copying apparatus of the present invention will be explained with reference to the functional charts of one embodiment shown in FIGS. 2 and 3.

When the copy button of the copying machine is operated, the motor M is activated by the signal action of the sensor St that detects the closed state of the exterior part in advance.
1. Both M2 and timer 1 are turned ON at the same time, but if sensor S2 still does not detect the recording paper even after timer 1 reaches a preset specified time, there is a conveyance accident, that is, a jam (jam 1) on the unloading roller 6. It is detected that this has occurred.

When the sensor S2 detects recording paper within the specified time of the timer 1, at that point the timer 1 is turned off and the timer 2 is turned on. If the sensor S2 continues to detect the recording paper even after the timer 2 reaches a specified time after the sensor S2 detects the recording paper, it is detected that a jam (jam 2) has occurred in the registration roller 7.

Similarly, if the sensor S3 detects the recording paper, it means that the recording paper has not been separated from the photoreceptor drum 2, but has been wrapped around it and deviated from the normal conveyance path (jam 3).

In addition, in the fixing paper discharge device, the fixing roller 11 of the recording paper
Wrapping (jam 4) on the sheet can be detected by the sensor S4, and furthermore, a conveyance accident (jam 5) caused by the sheet discharge roller 12 can be detected by the sensor S4 and the timer 4.

The following functions remove the jam 4 from the recording paper conveyance path.
．． If any one of 5 is detected, the signal is output to the circuit shown in Fig. 3, and the operation of motor M2 is stopped.If the detected recording paper is the last sheet, that is, the final copy, the motor M2 is stopped. The operation of M1 is also subsequently stopped.

However, if the following recording paper is being conveyed through the recording device, the motor Ml continues to operate to convey the recording paper to just before the fixing device and collect it JJ1, and the optical system I
That is, the timer 5, which is turned ON when the scanning of the final copy of the first mirror unit 1a is finished and the scanning starts to return, is stopped when a predetermined period of time has elapsed.

That is, according to the present invention, when a recording paper transport error occurs in the fixing and discharging device of a copying device, the operation of the fixing and discharging device is immediately stopped, but the recording device continues to operate and continues to transport the recording paper. After all of the paper has been conveyed to just before the fixing/discharging device, it is stopped.

Therefore, the recording paper that needs to be removed from the recording load for jam removal is gathered in one easy-to-take location, making the work much easier and copying resumed within a short time without requiring much effort or time. becomes possible.

〔Effect of the invention〕

The present invention detects a recording paper conveyance accident that occurs in the fixing and discharging device, thereby stopping only the operation of the fixing and discharging device, and removes all the recording paper in the recording device immediately before the fixing and discharging device. Therefore, it was decided to provide a copying apparatus having an excellent function of being able to stop all operations after conveying and accumulating images.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a copying apparatus according to the present invention. 2 and 3 are functional charts showing the operation of the copying apparatus. l...Optical system 2...Photosensitive drum 3
... Electrode group 4 ... Developing device 5 ...
... Cleaning device 6 ... Export roller 7
...Registration roller 8 ...Transport belt 11 ...Fixing roller 12 ...Discharge roller n ...Direct value MI M9 ... ... Data S1 to S4 ... Sensor C ... Paper cassette T ... Paper ejection tray Agent Patent attorney Yoshichika Noda

Claims (1)

[Claims] In a copying apparatus in which a recording device that records an image on recording paper and a fixing paper discharge device that fixes and then discharges the recording paper on which the image is recorded are driven independently, the recording paper is transferred to the fixing paper discharge device. If a conveyance accident occurs, the drive system that drives the fixing sheet discharge device is automatically stopped, and the recording paper in the recording device is conveyed to just before the fixing sheet discharge device, and then the recording paper is A copying device characterized by automatically stopping a drive system that drives the device.