JPS60216358A - Copying machine - Google Patents

Abstract

PURPOSE:To discharge completely recording paper which can be discharged by stopping a driving system automatically when a conveyance accident of recording paper occurs to a recording device, and discharging recording paper in a fixing and discharging device and then stopping the discharging device automatically. CONSTITUTION:When a sensor S2 detects no recording paper even at the prescribed time of a timer 1, the sensor detects the occurrence of the conveyance accident, i.e. jamming of a discharging-out roller 6. When the sensor S2 detects recording paper before the prescribed time of the timer 1, the timer 1 turns off at the point of time and a timer 2 turns on instead. If no recording paper is detected even at the prescribed time of the timer 2 after the sensor 2 detects said recording paper, the occurrence of a jam near a register roller 7 is detected and similarly when a sensor 3 detects recording paper, the state of such a jam that the recording paper is still wound around the photosensitive drum 2 without being separated and deviates from a normal conveyance path is detected. If some of the sensors S1-S3 detects a jam, a motor M2 is stopped after the conveyance of recording paper being conveyed is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a copying apparatus, such as an electrophotographic copying machine, in which the drive function of the apparatus is 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 machines has gradually increased, and especially copying machines equipped with flash exposure devices can expose documents to light for a very short time. Therefore, when making multiple copies of the same document, 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 local jams, it is necessary to remove all of the large number of sheets of recording paper from the copying machine, which requires a lot of effort and time, and not only does the recording paper that is being copied become wasted. , it will take a lot of time to restart the copy.

In particular, if the recording paper to which the image has been transferred is stopped for a long time in the fixing section, the unfixed toner may transfer to the fixing roller, staining the image on the following recording paper, or the fixing roller may stick to the recording paper and separate it. This may cause new problems, such as paper jamming.

Note that some copying devices drive the paper feed roller in the paper feeding section via an electromagnetic clutch, and if a jam occurs in the paper feeding section of such a copying device, the operation of the entire copying device will be affected. There is no need to stop the recording paper, and the jammed recording paper can be removed by only disengaging the electromagnetic clutch. However, if there is a jam in the photoconductor drum other than the paper feed section or in the paper transport section, or if the paper cannot be transported due to an opening in the outer case, the entire operation of the copying machine must be stopped, as in the previous example, before the paper can be removed. It cannot be removed.

In addition, there are some copying machines in which the recording device, that is, the process part from supplying and transporting recording paper to image formation and transfer, and the fixing/discharging device are each driven by independent drive systems, but conventional ones do not. Since both drive systems are structured to receive common control, it is not possible to stop only one of the drive systems.

[Purpose of the invention]

In order to handle a jam in the recording device of a copying device, the present invention allows even if the operation of the copying device is stopped, the fixing and discharging device continues to operate until it finishes ejecting the recording paper that can be fixed and discharged. The purpose is to provide copying equipment.

[Structure of the invention]

The present invention detects the travel time of the recording paper conveyed by a plurality of sensors disposed on the recording paper conveyance path in the copying apparatus and a timer connected thereto, and based on the results, detects the travel time of the recording paper conveyed by the recording paper of the copying apparatus. It is constructed by controlling the operation of the drive system that drives each of the fixing paper discharge devices.It consists of a recording device that records images on recording paper, and a fixing paper that fixes the recording paper with the recorded image and then discharges it. In a copying apparatus in which the recording apparatus and the apparatus are driven independently, if a recording paper transport accident occurs in the recording apparatus, the drive system that drives the recording apparatus is automatically stopped, and the fixing apparatus is automatically stopped. This is achieved by a copying apparatus characterized in that, after the recording paper in the paper ejecting device is lost, the drive system that drives the fixing paper ejecting device is automatically stopped.

〔Example〕

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

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

In other words, the operation of the recording device is as follows:
(first and second mirror units) la and 1b to expose and scan the document, rotation of the photosensitive drum 2, and related image forming process operations 4--namely, driving the developing device 4, cleaning device 5, and each electrode group 3 In addition, there are drives of a carry-out roller 6 for carrying out the recording paper from the paper feed cassette C, a registration roller 7, and a conveyance belt 8 for conveying the recording paper to the 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 device whose driving range is divided in this way, the completion of copy preparation of the copying device is detected,
Alternatively, in addition to the sensor S1 that detects the closed state of the exterior door, sensors S2 and S4, such as photo sensors, are placed at important points on the path where the recording paper is normally conveyed, and sensors S2 and S4 are placed at key points on the path where the recording paper is conveyed incorrectly. Sensors S3 such as sensors are arranged, and these sensors S2. , S3, and S4 are all capable of detecting the presence of recording paper, and the information from sensors S2 and S4 is connected to a timer in the control section, 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, both motors M1 and M2 and timer 1 are turned on at the same time by a signal from sensor S1 in the foreground that detects the closed state of the exterior part.
If the sensor S2 still does not detect the recording paper even after the timer 1 reaches a preset specified time, it is detected that a conveyance accident, that is, a jam (jam 1) has occurred on the discharge roller 6.

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 the specified time after the sensor S2 detects the recording paper, a jam occurs near the registration roller 7.
It is detected that jam 2) has occurred.

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 wound up and deviated from the normal conveyance path (jam 3).

As described above, by detecting the recording paper and its transport time using the sensor and the timer, the recording paper is wrapped around the fixing roller 11 in the fixing/discharging device (jam 4), and further, the paper discharging roller 12 is prevented.
It is also possible to detect problems such as poor ejection (jam 5).

With the above functions, the jam 1 is removed from the recording paper conveyance path.
．． 2. If any one of 3 is detected, that signal will be sent to the third
It is output to the circuit shown in the figure and the operation of motor M1 is stopped.
If the detected recording paper is the first recording paper, the operation of the motor M2 is also stopped, but if some recording paper has already been conveyed, the motor M2 stops operating again. 2
The drive and control of the fixing and paper discharging device by the motor M2 as shown in the figure continues.

That is, according to the present invention, when a recording paper conveyance accident occurs in the recording device of a copying device, the operation of the recording device is immediately stopped, but the fixing and discharging device continues to operate. It will stop after all of the recording paper that can be produced has been ejected.

Therefore, the number of sheets of recording paper that must be removed from the copying machine for jam removal is reduced, and the labor and time required for processing are also shortened. This also makes it possible to prevent accidents such as wrapping of recording paper.

〔Effect of the invention〕

The present invention detects a recording paper conveyance accident that occurs in a recording device, and accordingly stops only the operation of the recording device, and stops all operations after all the recording paper in the fixing/discharging device is ejected. The present invention has resulted in the provision of a copying device that has excellent functions that allow for a variety of applications.

[Brief explanation of 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. 8- 1...Optical system 2...Photosensitive drum 3
... Electrode group 4 ... Developing device 5 ...
... Cleaning device 6 ... Export roller 7
... Registration roller 8 ... Conveyance belt 11 ... Fixing roller 12 ... Paper discharge roller D ... Document Ml, M2 ... ...Motor S1-S4...Sensor C...Paper cassette T...Paper tray agent Patent attorney Field 1) Parent-in-law

Claims (1)

[Claims] In a copying machine in which a recording device that records an image on recording paper and a fixing/discharging device that fixes and then discharges the recording paper on which the image has been recorded are each driven independently, the recording paper is conveyed to the recording device. If an accident occurs, the drive system that drives the recording device will be automatically stopped, and after the recording paper in the fixing paper discharge device is ejected, the drive system that drives the fixing paper discharge device will be automatically stopped. A copying device characterized in that it is stopped at.