JPH05313439A - Copying device - Google Patents

Abstract

PURPOSE:To detect the occurrence of an abnormal image in advance, to prevent miscopying or the deterioration of quality, and to rapidly compe with the abnormality of output from a high voltage power source so as to improve service by detecting the abnormality of the output from plural high voltage output means related to an image forming process and displaying a warning message. CONSTITUTION:When a copying start key is depressed first, copying actions are started and the high voltage output of a high voltage generation circuit 903 is made on. The high voltage is for a primary charger, a developing device, and a pretransfer charger, etc. Thereafter, the generation of a high output abnormality signal is monitored. The output from a current detection circuit 904 is inputted in an abnormality detection circuit 905, and the output abnormality signal is outputted to a controller in the case that a current equal to or above a secified current flows. When the high output abnormality signal is detected, the error message is outputted on a display, and the copying actions are forcibly finished. The error message includes not only a message informing of the occurrence of high voltage output abnormality but also a message informing of an abnormality occurring spot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying apparatus using a charged image.

[0002]

2. Description of the Related Art In an electrophotographic copying apparatus using a charged image, a high voltage power source is used for primary and secondary charging, copying, transfer, separation, etc., and these high voltage outputs are output from various parts of the apparatus main body. It is controlled by a command from the controlling CPU. In addition, an abnormal state of high voltage output is detected by a current detection circuit or the like, and control such as suppressing output of the high voltage power supply is performed when an abnormality such as a leak occurs.

[0003]

However, in the conventional copying apparatus as described above, the output of the high-voltage power supply is suppressed when an abnormality such as a leak occurs, but the occurrence of the abnormality is controlled by each part of the main body. The CPU does not have a means to know, and the occurrence of an abnormal copy image is detected for the first time, and it is necessary to determine in the image forming process whether or not the cause of the abnormal image is due to a leak of the high-voltage power supply. There is a problem that it is necessary to be familiar to some extent, and if the user does not notice abnormally, miscopying or quality deterioration will occur.

The present invention has been made by paying attention to the above problems, and it is possible to detect the occurrence of an abnormal image in advance to prevent miscopying or deterioration of quality, and to output the high voltage power supply. The purpose of the present invention is to obtain a copying machine that can respond abnormally quickly and has improved serviceability.

[0005]

The copying machine of the present invention is constructed as follows.

(1) In an electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process, and an output abnormality detection for detecting an output abnormality of at least one of the high voltage output means Means and display means for displaying an alarm message when an output abnormality is detected.

(2) In an electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process, and an output abnormality detection for detecting an output abnormality of at least one of the high voltage output means Means and cleaning means for cleaning the charging portion of the high-voltage charger corresponding to the detection of the output abnormality.

(3) In the apparatus of (2) above, the cleaning means is a wire cleaning means for cleaning the wire.

(4) In the apparatus of (2) or (3) above, the cleaning means cleans when the output abnormality detection means has detected a predetermined number of output abnormalities.

(5) In an electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process and an output abnormality detection for detecting an output abnormality of at least one of the high voltage output means Means and output control means for changing the output of the corresponding high voltage output means when the output abnormality is detected.

(6) In the device of (5), the output control means is configured to change the output when the output abnormality detection means detects the output abnormality at a predetermined number.

[0012]

In the copying apparatus of the present invention, when any output abnormality of the high voltage output means relating to the image forming process is detected, the display means displays an alarm message.
Further, when the output abnormality is detected, the corresponding charger is cleaned by the cleaning means, or the output of the corresponding high voltage output means is changed by the output control means.

[0013]

1 is a block diagram showing the basic construction of a first embodiment of the present invention. In the figure, reference numeral 500 denotes a high-voltage power supply (high-voltage output means) related to the image forming process, which is a primary charger for charging electric charges on the photoconductor, and develops a latent image formed on the photoconductor to visualize it. Multiple units are provided for the developing device, the transfer charger that transfers the developed image to the copy paper, the pre-transfer charger that removes the charge before the transfer, and the separation charger that separates the copy paper after transfer from the photoconductor. Has been.

An operation panel 600 sets a copy mode and displays a status. Reference numeral 800 is a control device for controlling the entire apparatus main body, 900 is an output abnormality detecting means for detecting an output abnormality of at least one of the high-voltage power supplies 500, and is constituted by, for example, a current detection circuit of an output current. An abnormal signal is transmitted to the device 800. A display unit 950 displays an alarm message when the output abnormality is detected.

FIG. 2 is a cross-sectional view showing the entire copying apparatus having the above structure. In the figure, 100 is the above-mentioned device main body, 2
Reference numeral 00 denotes a circulation type automatic document feeder (hereinafter referred to as RDF) that automatically feeds documents, 300 is a sorter that is a sorting device, and 400 is an automatic computer form feeder (hereinafter referred to as CFF). The sorter 300 and the CFF 400 can be used by freely combining with the main body 100.

Next, the structure of the apparatus body 100 will be described.

In FIG. 2, 101 is a document table glass as a document placing table, 102 is an optical system as an image reading means, and a document illumination lamp (exposure lamp) 103, a scanning mirror, a lens, a motor 104, etc. The document is illuminated by the exposure lamp 103 while being scanned by the drive of the motor 104, and the light reflected from the document is applied to the photosensitive drum 105 by the scanning mirror and the lens.

Around the photosensitive drum 105, a primary high voltage unit 106 and a blank exposure unit 107 are provided.
A potential sensor 108, a developing device 109, a pre-transfer charger 150, a transfer charger 110, and a separation charger 111.
And a cleaning device 112, and the photosensitive drum 105 and the like constitute an image recording unit.

The photosensitive drum 105 is rotated by the main motor 113 in the direction of the arrow in FIG. 2 and is corona charged by the high voltage unit 106.
When the reflected light of the document is emitted from 2, an electrostatic latent image is formed. This electrostatic latent image is developed by the developing device 109 to become a toner image, which is visualized. On the other hand, from the upper cassette 114 or the lower cassette 115 through the pickup rollers 116 and 117, the paper feed rollers 118 and 119 are inserted.
The transfer paper sent to the inside of the main body 100 is timed by the registration roller 120 so that the front end of the toner image and the front end of the transfer paper are aligned, and then the transfer paper is fed to the photosensitive drum 105 and transferred. The toner image is transferred by the charger 110. After the transfer, the transfer sheet is separated from the photoconductor drum 105 by the separation charging device 111, guided to the fixing device 122 by the conveying belt 121, fixed by pressure and heating, and then discharged by the discharge roller 123 to the main body 1.
Is discharged to the outside of 00. The surface of the photosensitive drum 105 is cleaned by the cleaning device 112.

The main body 100 has, for example, 400
It is equipped with a deck 124 that can store about 0 sheets of transfer paper. The lift 125 of the deck 124 is adapted to ascend according to the amount of transfer paper so that the transfer paper always contacts the paper feed roller 126. Further, a multi-purpose manual feed 150 capable of storing about 100 sheets of transfer paper is also provided.

Further, in FIG. 2, 127 is a paper discharge flapper, which switches the path between the double-sided recording side or multiplex recording side and the discharge side (sorter 300). Then, the transfer paper sent from the discharge roller 123 is the discharge flapper 1
By 27, it is switched to the double-sided recording side or the multiple recording side. A lower conveyance path 128 guides the transfer paper sent from the discharge roller 123 to the re-feed tray 130 by reversing it via the reversing path 129. Reference numeral 131 denotes a multiple flapper that switches between double-sided recording and multiple recording paths. By tilting this flapper to the left, the transfer paper is directly guided to the lower transport path 128 without passing through the reverse path 129.

Reference numeral 132 denotes a paper feed roller for feeding the transfer paper to the photosensitive drum 105 side through the path 133, and 134 is arranged in the vicinity of the paper discharge flapper 127.
7 is a discharge roller that discharges the transfer sheet switched to the discharge side by 7 to the outside of the machine. When double-sided recording (double-sided copying) or multiplex recording (multiplex copying), the discharge flapper 127 is raised to transfer the copied copy. The paper is stored in the re-feed tray 130 in a state of being turned upside down via the transport paths 129 and 128.

At this time, the double flapper 13 is used for double-sided recording.
1 is tilted to the right, and the multiple flapper 131 is tilted to the left during multiple recording. Then, at the time of next-side recording or multiplex recording to be performed next, the transfer sheets stored in the re-feed tray 130 are guided to the registration rollers 120 from the bottom one by one by the sheet feeding roller 132 via the path 133.

When the transfer paper is reversed and discharged from the main body 100, the paper discharge flapper 127 is raised to
The flapper 131 is tilted to the right, and the copied transfer paper is conveyed to the conveyance path 129 side. Then, after the trailing edge of the transfer paper passes the first feed roller 140, the reverse roller 14
The sheet is conveyed to the side of the second feed roller 141 by 2 and the transfer sheet is turned upside down by the discharge roller 134 to be discharged outside the machine.

FIG. 3 is a block diagram showing the configuration of the control device 800 of FIG. In the figure, 801 is a CPU that controls the entire copying apparatus, and 802 is a read-only memory (RO) that stores the control procedure (control program) of the apparatus main body 100.
M), and the CPU 801 controls each component connected via the bus (BUS) according to the control procedure stored in the ROM 802. Reference numeral 803 denotes a random access memory (RAM) which is a main storage device used as a storage area for input data or a work storage area, and 804 is an input / output unit (I / O) for controlling the CPU 801 with respect to a load such as the main motor 113. A signal is output and a signal from the sensor 122 or the like is input and sent to the CPU 801.

FIG. 4 shows an operation panel 60 provided on the main body 100.
It is a top view showing the appearance of No. 0, showing an example of the arrangement configuration of each part. In the drawing, an asterisk (*) key 601 is used when the operator (user) selects a setting mode such as a binding margin amount setting or a document frame erasing size setting. A cursor key 627 is used when selecting a setting item in the setting mode. An OK key 628 is used to confirm the setting contents in the setting mode.

Reference numeral 606 denotes an all reset key, which is pressed when returning to the standard mode. The key 602 is also pressed when returning from the auto shutoff state to the standard mode. Reference numeral 605 denotes a copy start key (copy start key), which is pressed when copying is started.

A clear / stop key 604 has the function of a clear key during standby (standby) and a stop key during copy recording. This clear key is also used to cancel the set number of copies. The stop key is also used when interrupting continuous copying, and the copying operation is stopped after the copying at the time of pressing this key is completed.

Reference numeral 603 is a ten-key pad which is pressed to set the number of copies. It is also used when setting the asterisk (*) mode. 619 is a memory key,
This key 619 allows the user to register a mode that the user frequently uses. Here, four modes M1 to M4 can be registered.

Reference numerals 611 and 612 denote copy density keys,
Press to adjust the copy density manually. An AE key 613 is pressed when the copy density is automatically adjusted according to the density of the original, or when the AE (automatic density adjustment) is released and the density adjustment is switched to manual. 607
Is a copy paper selection key, and the upper paper lifter 11
9. Press when selecting lower paper lifter 115, paper deck 124, and multi-manual feed 150. Also, RDF2
When a document is placed on 00, APS (automatic paper cassette selection) can be selected by this key 607. And
When APS is selected, a cassette having the same size as the original is automatically selected.

Reference numeral 610 denotes a unity size key, which is pressed when making a copy of the same size (actual size). 616 is an automatic scaling key,
Press to automatically reduce or enlarge the original image according to the specified transfer paper size. 626 is a double-sided key,
Press to make a double-sided copy from a single-sided original, a double-sided copy from a double-sided original, or a single-sided copy from a double-sided original. Reference numeral 625 denotes a binding margin key. With this key 625, a binding margin of a designated length can be created on the left side of the transfer paper. A photo key 624 is pressed when copying a photo original. Reference numeral 623 denotes a multiple key, which is pressed when an image is created (combined) from the two originals on the same surface of the transfer paper.

Reference numeral 620 denotes an original frame erasing key, which is pressed by the user when erasing the frame of a standard size original document, and the size of the original document is set by the asterisk key 601 at that time. Reference numeral 621 denotes a sheet frame erasing key, which is pressed to erase the frame of the original according to the copy paper size. Reference numeral 629 denotes a cover mode setting key, which is used when the front cover, the back cover are created and a slip sheet is inserted. Reference numeral 630 denotes a page continuous copy key, which is used when the left and right pages of a spread book are continuously copied.

Reference numeral 614 denotes a sheet discharge method selection key for selecting a staple sort, sort, or group discharge method. When the stapled sorter is connected to the sheet after recording, staple sort mode, sort mode, group mode. Can be selected and the selection mode can be canceled.

Reference numeral 631 denotes a reservation key, which is the reservation tray 21.
It is used when starting the setting of the copy mode for the reserved document placed at 0 and when canceling the reservation setting. 632
Is a reservation setting key, and is used as an enter key when the reservation mode is set.

Reference numeral 633 is a guide key, which is used when the message display 701 displays an explanation of the function of each key. This message display 701 constitutes the display means 950 of FIG. 1 and displays information regarding copying. Further, it is an LCD (liquid crystal) type message display, and displays characters and figures with 96 × 192 dots, for example. For example, the number of copies set by the ten-key pad 603, the standard variable magnification keys 608, 609, the same-size key 610, the copy magnification set by the zoom keys 617, 618, the paper size selected by the paper selection key 607, and the state of the apparatus main body 100 are shown. Displays messages, guide messages that show operating procedures, and other settings for various modes.

Reference numeral 704 denotes an AE display, which is an AE key 61.
Lights when AE (automatic density adjustment) is selected by 3. Reference numeral 709 denotes a preheat indicator, which falls when in a preheat state.

When the RDF 200 is used in the standard mode, the number of copies is set to 1, the density AE mode, automatic paper selection, normal size, single-sided copy to single-sided copy are set. In the standard mode when the RDF200 is not used,
The settings are 1 copy, 1 density manual mode, 1: 1 copy, and 1-sided copy from 1-sided original. The difference between when the RDF 200 is used and when it is not used is determined by whether or not a document is set on the RDF 200.

FIG. 5 is a block diagram showing the circuit configuration of the output abnormality detecting means 900. The high voltage power source 500 includes a primary charger 106, a developer 109, and a pre-transfer charger 150.
, The transfer charger 110, and the separation charger 111, but since the basic configurations are the same, the basic configuration will be described.

A control circuit 901 is composed of a PWM oscillation circuit. Reference numeral 902 denotes a drive circuit, which is composed of a transistor group and drives a switching transistor according to the output of the control circuit 901. Reference numeral 903 is a high voltage generation circuit, which boosts the input voltage by a transformer and converts it into a high voltage. In the case of DC output, it is smoothed by a smoothing circuit.

Reference numeral 904 denotes a current detection circuit, which performs constant current control by feeding back the output to the control circuit 901. Here, although not shown, in the case of constant voltage control,
A voltage detection circuit is used instead of the current detection circuit 904. The output of the current detection circuit 904 is the abnormality detection circuit 905.
When the current exceeds the predetermined current, the output abnormality signal is output to the control device 800.

Next, the control operation of the copying machine having the above construction will be described with reference to the flowchart of FIG. In this embodiment, when a high voltage output abnormality occurs, an error message is immediately output and the copying operation is stopped.

First, waiting for the copy start key 605 to be pressed (step 1001), when this key 605 is pressed, the copy operation is started and the high voltage output of the high voltage generation circuit 903 is turned on (step 1002). This high voltage is for the primary charging device 106, the developing device 109, the pre-transfer charging device 150, the transfer charging device 110, and the separation charging device 111, and is turned on according to a predetermined timing. Thereafter, the occurrence of a high voltage output abnormality signal is monitored (step 100
3) When the high voltage output abnormal signal is detected, the display 7
Error message on 01 (step 100
5) Forcefully terminate the copying operation (step 100)
6). This error message includes a message notifying the occurrence of the high voltage output abnormality, and also a message notifying the occurrence location.

If there is no abnormal high voltage output in the above step 1003, it is judged that the copy operation is completed (step 100).
4) If the copying is not completed, the process returns to step 1003 and the output abnormality is monitored again. Then, if the copy operation is completed, the high voltage output is turned off according to a predetermined timing (step 100
7) The control operation is completed.

By performing the above control, the CPU can detect the output abnormality of the high voltage power source 500 related to the image process, and the occurrence of an abnormal image can be detected in advance to make a miscopy or a deterioration in quality. Can be prevented.

Further, when various troubles due to an output abnormality of the high-voltage power supply 500 occur, the cause thereof can be easily investigated and a quick response can be taken, so that the serviceability is improved.

FIG. 7 is a flow chart showing the control operation according to the second embodiment of the present invention. Here, a case is shown in which an error message is output after a series of copying operations have been completed after the occurrence of a high voltage output abnormality.

First, waiting for the copy start key 605 to be pressed (step 1010), when this key 605 is pressed, the copy operation is started and the high voltage output is turned on (step 1011). After that, the generation of the high voltage output abnormality signal is monitored (step 1012), and when the high voltage output abnormality signal is detected, an abnormality flag indicating that the high voltage abnormality has occurred is set (step 1013), and it is determined that the copy operation has ended. (Step 1014). At this time, if the copy operation is not completed, the process returns to step 1012 and the output abnormality is monitored again. Then, if the copying operation is completed, the high voltage output is turned off according to a predetermined timing (step 1015).

Thereafter, it is judged in step 1013 whether or not the abnormality flag is set (step 101
6) If the abnormality flag is set, an error message is output on the display 701 (step 10).
17). This error message includes a message notifying the occurrence of a high voltage output abnormality, as well as a message notifying the occurrence location.

FIG. 8 is a block diagram showing the configuration of the third embodiment of the present invention, and the same symbols as those in FIG. 1 indicate the same components. In the figure, reference numeral 951 is a wire cleaning means for cleaning the wire of the charging portion of the high-voltage charger corresponding to the output abnormality detecting means 900 when the output abnormality detecting means 900 detects an output abnormality.
Clean according to the instructions in. The other configurations are the same as those in FIGS.

FIG. 9 is a flow chart showing the control operation of the copying machine having the above construction. Here, a case is shown in which the copying operation is immediately stopped and the wire cleaning of the high-voltage charger is executed when the number of high-voltage output abnormality detections reaches a predetermined number or more.

First, waiting for the copy start key 605 to be pressed (step 2001), when this key 605 is pressed, the copy operation is started and the high voltage output is turned on (step 2002). This high voltage is used for the primary charging device 106, the developing device 109, the pre-transfer charging device 150, the transfer charging device 110, and the separation charging device 111 as in the above-described embodiment, and is turned on according to a predetermined timing. Then, the occurrence of a high voltage output abnormality signal is monitored (step 200
3) When a high voltage output abnormality signal is detected, "1" is added to the abnormality count (step 2004), and it is determined whether the abnormality count has become N or more times (step 200).
5). If the abnormality count is N or more, it is further determined whether or not the inhibition flag for inhibiting the wire cleaning at the time of abnormality detection is set (step 2006),
If it is not set, the copy operation is forcibly ended (step 2007), and the wire cleaning of the high-voltage charger is executed (step 2008).

Although the wire cleaning is not shown, the wire cleaning of all the high-voltage chargers may be carried out, or only the wire of the high-voltage part where an abnormality is detected may be cleaned. Then, after executing the wire cleaning, the abnormality count is cleared to zero (step 2009), and this operation is ended.

If the abnormal count is N times or less or the prohibition flag is set in the steps 2005 and 2006, it is judged that the copy operation is completed (step 2010). If the copy is not completed at this time, the step is completed. Returning to 2003, the output abnormality is monitored again. Then, if the copy operation is finished, the control operation is finished as it is.

FIG. 7 is a flow chart showing the control operation according to the fourth embodiment of the present invention. Here, the case where the wire cleaning of the high-voltage charger is executed after the series of copying operations is completed when the high-voltage output abnormality occurs a predetermined number of times or more.

First, waiting for the copy start key 605 to be pressed (step 2020), when this key 605 is pressed, the copy operation is started and the high voltage output is turned on (step 2021). Thereafter, the generation of the high voltage output abnormality signal is monitored (step 2022), and when the high voltage output abnormality signal is detected, "1" is added to the abnormality count (step 20).
23). Then, the monitoring of the output abnormality is continued until the copy operation is completed (step 2024).

Next, after the copying operation is finished, it is judged whether or not the prohibition flag for prohibiting the wire cleaning after the abnormality detection is set (step 2025). If not set, the abnormality count is N or more. It is determined whether or not (step 2026). At this time, if the abnormal count is N times or more, the wire cleaning of the high-voltage charger is executed (step 2027), the abnormal count is cleared to zero (step 2028), and this operation is ended. If the abnormal count is N times or less or the prohibit flag is set in steps 2025 and 2026, the control operation is terminated.

As described above, as in the embodiments of FIGS. 8 to 10, the CPU can detect the output abnormality of the high-voltage power supply related to the image process, and when the output abnormality of the high-voltage power supply is detected, the charging section is automatically cleaned. In addition, it is possible to prevent the occurrence of abnormal images and reduce miscopying or quality deterioration.

Further, since the frequency of occurrence of various troubles due to the output abnormality of the high-voltage power source 500 is reduced, the number of maintenances is reduced and the serviceability is improved.

FIG. 11 is a block diagram showing the configuration of the fifth embodiment of the present invention. In the figure, 952 is an output abnormality detecting means 9
High-voltage power supply 500 corresponding to when 00 detects an output abnormality
Is an output control means for changing the output of
The output of the high voltage power supply 500 is controlled based on the command of 0.
The other configurations are the same as those in FIGS.

FIG. 12 is a flow chart showing the control operation of the copying machine having the above construction. Here, the case where the output control signal of the high voltage power supply output is immediately changed when the high voltage output abnormality occurs a predetermined number of times or more is shown.

First, waiting for the copy start key 605 to be pressed (step 3001), when this key 605 is pressed, the copy operation is started and the high voltage output is turned on (step 3002). After that, the generation of the high voltage output abnormality signal is monitored (step 3003), and when the high voltage output abnormality signal is detected, “1” is added to the abnormality count (step 300
4) It is determined whether the abnormal count is N or more times (step 3005). If the abnormality count is N times or more, it is further determined whether or not the prohibition flag for prohibiting the change of the high voltage power supply output at the time of abnormality detection is set (step 3006). Output value is reduced by a predetermined value (step 3007). After that, the abnormal count is cleared to zero (step 3008) and this operation is ended.

If the abnormal count is N times or less or the prohibition flag is set in the above steps 3005 and 3006, it is judged that the copy operation is completed (step 3010), and if the copy is not completed at this time, the step is completed. Returning to 3003, the output abnormality is monitored again. If the copy operation is finished, the control operation is finished as it is.

FIG. 13 is a flow chart showing the control operation according to the sixth embodiment of the present invention. Here, the case where the output control signal of the high voltage power supply output is changed after the series of copying operations is completed when the high voltage output abnormality occurs a predetermined number of times or more.

First, waiting for the copy start key 605 to be pressed (step 3020), when this key 605 is pressed, the copy operation is started and the high voltage output is turned on (step 3021). Thereafter, the occurrence of the high voltage output abnormality signal is monitored (step 3022), and when the high voltage output abnormality signal is detected, "1" is added to the abnormality count (step 30).
23). Then, the monitoring of the output abnormality is continued until the end of the copy operation (step 3024). Next, after the copy operation is finished, it is judged whether or not the prohibition flag for prohibiting the change of the high-voltage power supply output at the time of abnormality detection is set (step 3025). If not set, the abnormality count is N.
It is determined whether the number of times is equal to or more than the number of times (step 3026).
At this time, if the abnormal count is N or more, the output value of the corresponding high voltage is decreased by a predetermined value (step 3027), the abnormal count is cleared to zero (step 3028), and this operation is ended. If the abnormal count is N times or less or the prohibit flag is set in steps 3025 and 3026, the control operation is terminated.

As described above, as in the embodiments of FIGS. 11 to 13, the CPU can detect the output abnormality of the high-voltage power supply related to the image process, and when the output abnormality of the high-voltage power supply is detected, the high-voltage output is automatically lowered. In addition, it is possible to prevent the occurrence of abnormal images and reduce miscopying or quality deterioration.

Further, since the frequency of occurrence of various defects due to the output abnormality of the high-voltage power supply 500 is reduced, the number of maintenances is reduced and the serviceability is improved.

[0067]

As described above, according to the present invention, the output abnormality of the high voltage output means relating to the image forming process is detected, and the message is displayed, the high voltage charging section is cleaned, or the high voltage output is changed. Therefore, the occurrence of an abnormal image can be detected in advance to prevent miscopying or quality deterioration, and an output abnormality of the high-voltage power supply can be quickly dealt with, which improves serviceability.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the overall configuration of the copying apparatus.

FIG. 3 is a block diagram showing the configuration of the control device shown in FIG.

FIG. 4 is a plan view showing the appearance of the operation panel of FIG. 1.

FIG. 5 is a block diagram showing a circuit configuration of the abnormality detecting means in FIG.

FIG. 6 is a flowchart showing the control operation of the first embodiment.

FIG. 7 is a flowchart showing the control operation of the second embodiment of the present invention.

FIG. 8 is a block diagram showing the configuration of a third embodiment of the present invention.

FIG. 9 is a flowchart showing the control operation of the third embodiment.

FIG. 10 is a flowchart showing the control operation of the fourth embodiment of the present invention.

FIG. 11 is a block diagram showing the configuration of a fifth embodiment of the present invention.

FIG. 12 is a flowchart showing the control operation of the fifth embodiment.

FIG. 13 is a flowchart showing the control operation of the sixth embodiment of the present invention.

[Explanation of symbols]

 500 high voltage power source (high voltage output means) 800 control device 900 output abnormality detection means 950 display means 951 wire cleaning means 952 output control means

Claims (6)

[Claims] 1. An electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process, and an output abnormality detecting means for detecting an output abnormality of at least one of the high voltage output means. And a display means for displaying an alarm message when the output abnormality is detected. 2. In an electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process and an output abnormality detecting means for detecting an output abnormality of at least one of the high voltage output means. And a cleaning means for cleaning the charging portion of the high-voltage charger when an output abnormality is detected. 3. The copying apparatus according to claim 2, wherein the cleaning unit is a wire cleaning unit that cleans a wire. 4. The copying apparatus according to claim 2, wherein the cleaning unit cleans when the output abnormality detection unit detects the number of output abnormalities reaches a predetermined number. 5. In an electrophotographic copying apparatus using a charged image, a plurality of high voltage output means relating to an image forming process, and an output abnormality detecting means for detecting an output abnormality of at least one of the high voltage output means. And a output control means for changing the output of the high voltage output means corresponding to the detection of the output abnormality. 6. The copying apparatus according to claim 5, wherein the output control unit changes the output when the output abnormality detection unit detects a predetermined number of output abnormalities.