JPH0369968A - Copying device - Google Patents

Abstract

PURPOSE:To efficiently execute a driving abnormality recovering sequence by switching the driving abnormality recovering sequence by a control means from the 1st driving abnormality recovering sequence to the 2nd driving abnormality recovering sequence accompanied with the stopping of respective driving means before and after feeding a recording medium. CONSTITUTION:The respective driving means is constituted of a DC motor 25, an optical system motor 26 and a lens driving motor 40, etc. Then, a switching means 100C is provided, which switches the driving abnormality recovering sequence by the control means 100 from the 1st driving abnormality recovering sequence to the 2nd driving abnormality recovering sequence accompanied with the stopping of the respective driving means 25, 26 and 40 before and after feeding the recording medium by the driving means. Namely, when a driving abnormal state is detected by state detection means 29 and 30 before feeding the recording medium, the control means 100 executes the 1st driving abnormality recovering sequence. When the abnormal state is detected by the means 29 and 30 after feeding the recording medium, the control means 100 executes the 2nd driving abnormality recovering sequence. Thus, processing for recovering the abnormality of the respective driving means 25, 26 and 40 is efficiently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus that forms images according to an electrophotographic method, and more particularly to a copying apparatus that self-diagnoses abnormalities in a copying sequence.

[Conventional technology]

Conventionally, in this type of copying apparatus, a plurality of, for example, DC motors, stepping motors, etc., which serve as driving means for rotationally driving each mechanism for executing a copying sequence at a predetermined speed, are arranged at predetermined positions.

A controller controls a series of copying sequences based on a copying command from an operator while monitoring detection outputs such as sensor outputs from each part.

In the copying apparatus configured as described above, when an abnormality in the driving means is detected by the sensor output, the copying operation is stopped all at once, or the abnormality recovery operation of the driving source is performed regardless of the position of the transfer paper. It was configured.

(Problem to be Solved by the Invention) For this reason, when an abnormality occurs in the drive means, it is necessary to simply stop the copying operation and ensure the safety of the copying device, but the copying process cannot be performed without drawing out the maximum capacity of the drive means. Because the copying machine had been stopped, the operating rate of the copying machine was decreasing.

In addition, if an abnormality occurs in the driving means and the driving operation is repeated regardless of the position of the transfer paper, and an attempt is made to cancel the abnormality in the driving means, the transfer paper is re-fed during the repetition of the driving operation, and the abnormality is detected. If the problem cannot be canceled, the transfer paper can be transferred to the fixing unit, which is a heat source, by creating a defect that causes wastage of the transfer paper or an interruption after feeding the transfer paper (a period during which the drive operation is repeated to cancel the abnormality). If the above-mentioned interruption occurs when the paper is stopped or the lamp of the optical system is turned on, there are serious problems such as a reduction in the safety of the copying apparatus.

This invention has been made to solve the above problems, and by controlling re-driving/stopping of copying operation while taking into account the timing of occurrence of an abnormality in the driving means and the conveyance state of the transfer material, each driving means It is an object of the present invention to provide a copying apparatus that can perform abnormality recovery processing with high safety and efficiency.

[Means to solve the problem]

In the copying apparatus according to the present invention, the drive abnormality recovery sequence by the control means is switched from a first drive abnormality recovery sequence to a second drive abnormality recovery sequence in which each drive means is stopped before and after the recording medium is fed by the drive means. It is equipped with a switching means.

Further, the control means is configured to execute the first drive abnormality recovery sequence before the abnormal drive state is detected by the state detection means before the recording medium is fed.

Further, the control means is configured to execute the second drive abnormality recovery sequence after the abnormal drive state is detected by the state detection means after the recording medium has been fed.

(Operation) In the present invention, when each drive means starts driving, the state detection means starts detecting an abnormal drive state of each drive means and starts monitoring each drive means.

When an abnormal drive state caused by each drive means is detected by the state detection means, the switching means changes the drive abnormality recovery sequence from the first drive abnormality recovery sequence to the second drive abnormality recovery sequence by the control means before and after the recording medium is fed by the drive means. This makes it possible to switch to the drive abnormality recovery sequence of 1 and execute different drive abnormality recovery sequences depending on the feeding state of the recording medium.

Further, if the state detection means detects an abnormal drive state of each drive means before feeding the recording medium, the control means executes a first drive abnormality recovery sequence and repeats driving of each drive means. It is possible to recover from an abnormal state of each drive means.

Further, if the state detection means detects an abnormal drive state of each drive means after feeding the recording medium, the control means executes a second drive abnormality recovery sequence to stop the drive of each drive means, It is possible to prioritize the release of recording media.

〔Example〕

FIG. 1 is a cross-sectional configuration diagram illustrating the configuration of a copying apparatus showing an embodiment of the present invention.

In the figure, 1 is a main body, and 2 is a document pressure plate, which presses a document placed on a document table glass (platen) 3. Reference numeral 4 denotes a document illumination lamp, which constitutes a scanner with scanning screens 5 to 5, and scans from the home position on the left side in the figure to the right at a constant scanning speed according to the set magnification to capture the reflected image. Imaging lens 8. It is imaged onto the photosensitive drum 12 via a scanning mirror 9.10. 26 is an optical system motor that reciprocates the scanner at a constant speed.

11 is a process cut, a developing unit 15° and a photosensitive drum 12. -Charger 13. A cleaner 38 is integrally formed with the paper feed roller 18 . A toner image developed by a developing sleeve 15 a is transferred onto a recording medium (recording paper) fed by a registration roller 19 by a transfer charger 14 . Then, the toner remaining on the photosensitive drum 12 is removed by a cleaner 3.
8, and repeats a series of processes to prepare for the next image formation, thereby executing copy IA embedding of the original image. Note that 13a is a grid.

A blank exposure lamp (pre-exposure lamp) 16 exposes a non-image area on the photosensitive drum 12 to prevent toner consumption due to unnecessary development.

A pickup roller 17 conveys the recording paper stored in the paper feed cassette 23 to a position where the paper feed roller 18 is provided.

A conveyor belt 20 conveys the recording paper on which image transfer has been completed to a fixing device 21 . The fixing device 21 heats and presses the toner image on the recording paper using a heat roller 35a to fix it. 35 is a temperature detection element composed of a thermistor, etc., which is connected to the heat roller 3.
The controller unit C0N detects the surface temperature of 5a and will be described later.
A temperature detection signal is output to T. Reference numeral 22 denotes a paper ejection roller that ejects the recording paper that has undergone the thermal fixing process onto the paper ejection tray 39 . Note that the sensor 34 monitors the discharge state of the recording paper after the thermal fixing process has been completed.

25 A DC motor serving as the main motor operates the paper feed section, the m feed section, and the photosensitive drum 12. The fixing device 21 is driven. Reference numeral 26 denotes an optical system motor composed of, for example, a stepping motor, which reciprocates the scanner at a predetermined speed. A home position sensor (optical system sensor) 29 detects the home position of the scanner.

A lens sensor 30 detects the home position of the imaging lens 8. Reference numeral 40 denotes a lens drive motor (lens motor) composed of, for example, a stepping motor, which moves the imaging lens 8 constituting the zoom lens and positions it at a predetermined magnification position.

27.36 is senna.

C0NT is a controller section that comprehensively controls the operations of each of the above sections.

FIG. 2 is a block diagram illustrating the configuration of the controller unit C0NT shown in FIG. 1, and the same components as in FIG. 1 are given the same reference numerals.

In this figure, 100 is a controller, and ROM10
0a, RAM 100b, switching means 100C, etc., and collectively controls each part based on a control program stored in ROMI○Oa. DR is a motor driver.

In the copying apparatus configured in this way, each drive means (
DC motor25. When the drive by the optical system motor 26° lens drive motor 40) is started, the state detection means (home position sensor 29, lens sensor 30, etc.) ) starts detecting the abnormal drive state of each DC
Motor 25. Optical system motor 26. Lens drive motor 40
Start monitoring the driving status.

And each DC motor 25. An abnormal drive state caused by the optical system motor 26 and lens drive motor 40 is detected by the home position sensor 29. When detected by the lens sensor 30 etc.,
The switching means 100c performs a first drive abnormality recovery sequence, which will be described later, by the control means (controller unit C0NT) before and after feeding the recording medium by the drive means (DC motor 25, optical system motor 26, lens drive motor 40). The sequence is switched to a second drive abnormality recovery sequence, and different drive abnormality recovery sequences are executed depending on the feeding state of the recording medium.

Also, before feeding the recording medium, each DC motor 25.degree. optical system motor 26. When an abnormal drive state by the lens drive motor 40 is detected by the state detection means, the controller unit C0NT executes a first drive abnormality recovery sequence,
Each DC motor 25° optical system motor 26. By repeating the driving of the lens drive motor 40, each DC motor 25. It is possible to recover from an abnormal state of the optical system motor 26 and lens drive motor 40.

Furthermore, after feeding the recording medium, each DC motor 25, optical system motor 26 . When an abnormal drive state by the lens drive motor 40 is detected by the state detection means, the controller unit C0NT executes a second drive abnormality recovery sequence to stop driving each controller unit C0NT and release the recording medium. Allows you to prioritize.

Next, a copying sequence to a recording medium in the copying apparatus according to the present invention will be explained.

The photosensitive drum 12 rotates clockwise in the figure.

- The potential charged on the photosensitive drum 12 by the charger 13 is exposed at the exposure position, developed in the development unit 15, and applied to the recording medium (transfer paper) fed from the paper feed section by the transfer charger 14. Transfer the image. After the transfer, residual toner is removed from the photosensitive drum 12 by the cleaner 38, residual potential is removed by the pre-exposure lamp 16, and image formation is performed again. This process is repeated.

Further, when the driving force transmitted from the DC motor 25 is transmitted to the pickup roller 17 via a paper feed solenoid (not shown), the transfer paper starts to be rotated, and the transfer paper stored in the paper feed cassette 23 reaches the feeding roller 18, and the transfer paper is further fed by the feeding roller 18 to the registration roller 19 and stopped. And under this condition,
The optical system motor 26 starts scanning the document, synchronizes with the visible image on the photosensitive drum 12, and drives the registration roller 19 again.

The transfer paper on which the image has been transferred is conveyed to the fixing device 21 by the conveyance belt 20, and is pressurized by the heat roller 35a of the fixing device 21 and a roller whose opposing surface has an elastic force, so that the toner image on the transfer paper is is established.

Note that the heat roller 35a has a halogen lamp as a heat source, and this halogen lamp is built in in the axial direction of the roller. This halogen lamp is monitored by a temperature detection element 35, and the temperature is controlled (ON10FF control of the halogen lamp) so that the surface temperature becomes a predetermined temperature (for example, about iso.degree. C.).

The recording paper that has passed through the fixing device 21 is discharged from the fixing device 21 by a paper discharge roller 22 and stacked on a paper discharge tray 39.

Next, the copy processing operation of the copying apparatus according to the present invention will be further explained with reference to FIG.

FIG. 3 is a timing chart illustrating the copying sequence of the copying apparatus according to the present invention.

Before performing a copying operation, press the normal housing switch (not shown).
The main switch) is turned off, and when the main switch is turned on, a period (wait cycle) TMI occurs during which the heat source is controlled so that the fixing device 21 reaches a predetermined temperature to enable copying operations. During this period, the imaging lens 8 is set to the same magnification position, the scanner is set to the exposure start position (home position),
Set to an initial state that allows copying.

Then, the standby state (
When the standby state 7M2) is entered and the copy key is pressed, the copy sequence starts (copy state 7M2).
3). That is, the DC motor 25 is driven, the paper feed roller 17 is driven, and the recording medium is fed. Then, the scanner is driven forward to scan and expose the original. Then, when the forward drive to the predetermined position is completed, the backward drive is started. Then, it enters a wait state (tie mastering TM4) until the next copy command.

Next, the drive system abnormality recovery sequence switching process in the copying apparatus according to the present invention will be described with reference to FIG.

FIG. 4 is a flowchart illustrating an example of a drive system abnormality recovery sequence switching process procedure in the copying apparatus according to the present invention. Note that (1) to (15) indicate each step. Further, this flow corresponds to the first drive abnormality recovery sequence related to the copying apparatus of the present invention.

First, the controller 100 clears an abnormality counter and timer T1 provided in the internal circuit (1). Next, it is determined whether the imaging lens 8 is at the home position (HP) 2) If YES, the process proceeds to step (10), and the rotation direction of the lens drive motor 40 is driven in CCW, so that the imaging lens 8 is at the home position (HP). Drive X4 pulses at a predetermined pulse rate to the position required to obtain double copies.

On the other hand, if the judgment in step (2) is NO, start the timer TI for detecting a driving abnormality of the imaging lens 8 (3). Drive X1 pulse in the direction (4)
Note that the pulse rate ■ is 100 pps and 10 pulses.

Next, the imaging lens 8 returns to the home position (HP).
5) If YES, step (1)
0), and if No, drive the lens drive motor 40 with 2 pulses in the CW force direction at the pulse rate ■ shown in Fig. 5 (6) In addition, the pulse rate ■ is 200 ppsl.
It becomes an O pulse.

Next, the imaging lens 8 returns to the home position (HP).
7) If YES, step (1)
0), and if NO, drive the lens drive motor 40 in the CW force direction x 2 pulses at the pulse rate ■ shown in Fig. 5 (8) In addition, the pulse rate ■ is 300 ppsl.
It becomes an O pulse.

Next, the imaging lens 8 returns to the home position (HP).
9) If YES, step (1)
If the answer is No, it is determined whether the timer T1 has timed up (11); if the answer is No, it is returned to step (8); if it is YES, the abnormality counter is incremented (12), and if the value of the abnormality counter is r24. 13), if no, return to step (3), YE
If it is S, an abnormality will be displayed on the operation panel (not shown) (14)
, stops the copying operation (15).

FIG. 5 is a timing chart showing an example of the pulse rate of the lens drive motor 40 shown in FIG.
A, B, and B indicate each excitation phase.

FIG. 6 is a characteristic diagram showing the relative relationship between the pulse rate and generated torque of the lens drive motor 40 shown in FIG.
ps).

As can be seen from these figures, a stepping motor such as the lens drive motor 40 generates a larger torque when the pulse rate is lower, and by passing through the drive pulse, the imaging lens 8 motor is positioned and driven. There is.

By the way, the most common failure in the drive system is torque fluctuation, and the load increases as the operating temperature of the copying device decreases.

Therefore, if an abnormality occurs (if the movement is not completed while timer TI is counting), the lens drive motor 4
If the output torque of 0 is increased at a pulse rate of {circumflex over (2)} and the i-movement is achieved by re-driving, it will be possible to control the copying machine so that it does not stop due to an abnormal state.

As described above, in the wait cycle TMI, as shown in FIG. 3, if the copying apparatus is in the process of controlling the temperature of the fixing device 21, no trouble will occur due to the above-mentioned re-driving process; If the re-driving process is executed for the abnormal area while feeding the paper, for example, if the DC motor 25 stops while the recording paper is being fixed in the fixing device 21, if the re-driving process is executed, the recording paper will be fixed in the fixing device 21. If the recording paper is stopped for a certain period of time or more, the amount of heat in the recording paper will exceed, creating a safety problem. Therefore, as shown in FIG. 7, the abnormality recovery sequence in each drive means is first
The above-mentioned safety is ensured by switching from the drive abnormality recovery sequence to the second drive abnormality recovery sequence. FIG. 7 is a flowchart showing an example of a drive abnormality recovery sequence switching process procedure in the copying apparatus according to the present invention. Note that (1) to (9) indicate each step.

When the power is turned on, this flow starts, waits for the copy key to be pressed (1), starts driving each drive system (2), and detects the output from each sensor that monitors abnormal drive of each drive system. Determine whether a drive abnormality has been detectedH)
If No, the process proceeds to step (6), executes the normal copying sequence, and ends the process.

On the other hand, if the judgment in step (3) is YES, it is necessary to judge whether the abnormality detection timing is before paper feeding 4)
If No (after paper feeding), the second drive abnormality recovery sequence is executed (5), the edict of each drive system is stopped, the copying process is stopped, and then the process waits.

On the other hand, if the judgment in step (4) is YES, the above-mentioned first drive abnormality recovery sequence should be executed 7), the system should wait for recovery from the abnormal drive 8) the copying sequence after recovery should be executed 9) , ends the process.

(Effects of the Invention) As explained above, the present invention changes the drive abnormality recovery sequence by the control means before and after the recording medium is fed by the drive means from the first drive abnormality recovery sequence to the second drive abnormality recovery sequence that involves stopping each drive means. Since the switching means for switching to the drive abnormality recovery sequence is provided, it becomes possible to execute the optimum drive abnormality recovery sequence in accordance with the feeding state of the recording medium, and it is possible to repeat the recoverable drive abnormality recovery sequence.

Therefore, unnecessary stoppage of the drive system accompanying the drive abnormality recovery sequence can be prevented, and execution of the copy sequence can be effectively ensured.

Further, since the control means is configured to execute the first drive abnormality recovery sequence before the abnormal drive state is detected by the state detection means before the recording medium is fed, the control means is configured to perform the first drive abnormality recovery sequence using the torque during initial drive. It is possible to efficiently execute a drive abnormality recovery sequence that reduces the load on the drive system.

Furthermore, since the control means is configured to execute the second drive abnormality recovery sequence after the abnormal drive state is detected by the state detection means after the recording medium has been fed, the control means is configured to execute the second abnormal drive recovery sequence after the recording medium has already been fed into the machine. At this point, priority can be given to releasing the recording medium from inside the machine, and excellent effects such as being able to execute a drive abnormality recovery sequence that ensures safety inside the machine can be achieved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram illustrating the configuration of a copying machine showing an embodiment of the present invention, FIG. 2 is a block diagram illustrating the configuration of the controller section shown in FIG. 1, and FIG. 4 is a flowchart illustrating an example of a drive system abnormality recovery sequence switching process procedure in the copying apparatus according to the present invention, and FIG. FIG. 6 is a tie chart showing an example of the pulse rate of the lens drive motor, and FIG. 7 is a characteristic chart showing the relative relationship between the pulse rate of the lens drive motor shown in FIG. 1 and the generated torque.
The figure is a flowchart showing an example of a drive abnormality recovery sequence switching process procedure in a copying apparatus according to the present invention. In the figure, 25 is a DC motor, 26 is an optical system motor, 40 is a lens drive motor, and C0NT is a controller section. Figure 2

Claims (3)

[Claims] (1) It has a plurality of drive means, a plurality of state detection means for detecting abnormal drive states of each of these drive means, and a control means for executing a drive abnormality recovery sequence based on the detection signals of these state detection means. In the copying apparatus, switching the drive abnormality recovery sequence by the control means from a first drive abnormality recovery sequence to a second drive abnormality recovery sequence in which each of the drive means is stopped before and after the recording medium is fed by the drive means. A copying apparatus characterized by comprising means. (2) The copying apparatus according to claim 1, wherein the control means executes the first drive abnormality recovery sequence before the abnormal drive state is detected by the state detection means before the recording medium is fed. (3) The copying apparatus according to claim 1, wherein the control means executes the second drive abnormality recovery sequence after the abnormal drive state is detected by the state detection means after the recording medium has been fed.