JPH04333065A - Image forming device - Google Patents

Abstract

PURPOSE:To allow a service man to speedily and accurately carry out maintenance and inspection by accurately grasping the jamming occurrence status as necessary. CONSTITUTION:A means 2e is provided to calculate the rate of occurrence according to the cause of jammings from the present copied number of pieces up to a specified number of pieces set beforehand. A means 2f is provided to compare and judge that calculated data with a reference value, which is set before hand. Then, the result is displayed on a display means 4 as necessary.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of jam data necessary for maintenance and inspection of image forming apparatuses such as copying machines.

0002

2. Description of the Related Art In a conventional image forming apparatus such as a copying machine, a jam detection sensor is provided in a paper conveyance path within the apparatus, the jam detection sensor detects a jam, and the location of the jam is determined based on the detection signal. At the same time, the copier stopped operating.

[0003] These conventional paper sheets are designed to enable the user to easily remove the jammed paper by knowing the location where the jam occurred when the paper jam occurred.

0004

[Problems to be Solved by the Invention] The conventional system described above was not designed to allow service personnel to obtain necessary information during maintenance and inspection, so service personnel themselves had to check with copying machine users about the occurrence of jams. or had to make copies to actually recreate the jam.

[0005]

[Means for Solving the Problems] Claim 1 of the present invention, as shown in the embodiment, includes a jam detection sensor (1) for detecting a jam in a paper conveyance path, and the jam detection sensor (1). a jam determining means (2a) for determining whether a jam has occurred based on a signal from the jam determining means; and a jam cause determining means (2c) for determining the cause of a jam based on a signal from the jam determining means. In the image forming device,
A jam counter (2b) counts the number of jams that have occurred between the current number of copies and a preset number of copies before, based on a signal from the jam determining means (2a).
), a cause-specific jam counter (2d) that counts the number of jams for each cause that have occurred between the current number of copies and a predetermined number of times before based on the signal from the jam cause determining means (2c); Cause-specific jam occurrence rate calculation means (cause-specific jam occurrence rate calculating means) that calculates the cause-specific jam occurrence rate that has occurred between the current number of copies and a predetermined number of times before based on the data of the counter (2b) and the data of the cause-specific jam counter (2d). 2e) and the cause-based jam occurrence rate calculation means (2e
) and a cause-specific jam occurrence rate comparison/judgment means (2f) that compares and makes a decision by comparing the data calculated by The present invention is characterized by comprising a display means (4) for displaying data on the jam occurrence rate by cause based on the comparative determination result in (2f).

A second aspect of the present invention is a jam detection sensor (1) for detecting a jam in the paper conveyance path, and a signal from the jam detection sensor (1) to determine whether or not a jam is occurring. In an image forming apparatus, the image forming apparatus includes a jam determining means (2a) for determining a jam, and a jam cause determining means (2c) for determining a cause of a jam based on a signal from the jam determining means, wherein the signal from the jam determining means (2a) is a jam counter (2b) that counts the number of jams that have occurred between the current number of copies and a predetermined number of copies before the current number of copies based on the jam counter (2b); A cause-specific jam counter (2d) that counts the number of cause-specific jams that occurred between the number of jams and a predetermined number of times before, and a cause-specific jam counter (2d)
2d) and a cause-specific jam data comparison/judgment means (2g) that makes a decision by comparing the data of 2d) with a preset reference value;
The present invention is characterized by comprising a display means (4) for displaying data of a cause-specific jam counter (2d) based on the comparative judgment results obtained by the method (4).

[0007]

[Operation] According to the image forming apparatus as described above, it is possible to accurately grasp the jam occurrence situation as needed, so that maintenance and inspection can be carried out quickly and accurately by service personnel.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of a copying machine according to the present invention. FIG. 2 is a diagram showing the main part of the operation panel section of the copying machine according to the present invention. FIG. 3 is a control flowchart of the copying machine according to the present invention. FIG. 4 is a control block diagram of the copying machine according to the present invention.

First, the configuration of a copying machine according to the present invention will be explained. Reference numeral 11 denotes the main body of the copying machine, and a document cover 12 is provided on the upper surface of the main body of the copying machine, and a photoreceptor 13 is provided approximately in the center below. Around the photoconductor 13, from the upstream side in the direction of rotation, there is a main charger 14, an exposure device 1, etc.
5, a developing device 16, a transfer charger 17, a cleaning device 18, and a static elimination lamp 19 are provided in this order. 20 is a paper transport path, and the copying machine main body 11 is connected to the paper transport path 20.
It is provided so as to be separable up and down, for example, about a pivot provided on the fixing paper discharge side. Above paper conveyance path 2
A paper feed tray 21, a paper feed roller 22, etc. are provided on the paper feed side of No. 0.

The paper feed tray 21 and the transfer charger 17
There is a paper feed detection sensor 1 between the
a and the paper stop roller 23, from the transfer charger 17 to the paper ejection side, there is a peeling detection sensor 1b that detects a jam in the peeling section, a fixing device 24, a paper output detection sensor 1c that detects a jam in the fixing paper output section, and a paper discharge side. Trays 25 are sequentially provided. Further, the operation panel 26 is provided with various keys such as a display means 4 for displaying copying conditions, jam data, etc., and a jam cause key 3.

[0011] Here, the copying process of the above-mentioned copying machine will be explained. First, the surface of the photoreceptor 13 is uniformly charged by negative corona discharge from the main charger 14,
Next, using the copy lamp 15a of the exposure device 15 as a light source, the optical image of the original is transferred to the photoconductor 13 by the convergent light transmitter 15b.
The image is focused upwards, reducing the resistance value of the area hit by the light and removing negative charges. As a result, an electrostatic latent image is formed on the surface of the photoreceptor 13. Next, the electrostatic latent image on the photoreceptor 13 is visualized by the developing device 1b. The visualized image on the photoreceptor 13 is transferred by discharge from the transfer charger 17 onto a sheet of paper conveyed from the paper feed tray 21 through the paper conveyance path 20 at the timing of copying. After the transfer, the paper is conveyed to the fixing device 24, where it is fixed under heat and pressure, and then discharged to the paper discharge tray 25.

On the other hand, after the transfer, the residual toner on the photoreceptor 13 is removed by the cleaning device 18, and then the residual charge on the photoreceptor 13 is removed by the charge removal lamp 19. Thereafter, the above transfer cycle is repeated for each transfer. Next, jam detection will be explained. Detection signals from the jam detection sensors 1a, 1b, and 1c provided at three locations on the paper transport path are sent to the control unit 2, and the jam determination means 2a in the control unit 2 determines whether or not a jam has occurred. be done. For example, if a jam occurs in the paper feed section, the paper feed roller 22 feeds the topmost sheet of paper stored in the paper feed tray 21, and then the paper is fed within a predetermined time. Paper detection sensor 1a
If it is not turned on, it is determined that a jam has occurred.

In the case of a jam in the peeling section, if the peel detection sensor 1b is not turned on within a predetermined time after the paper stop roller 23 is turned on, it is determined that a jam has occurred.

Further, if the paper output detection sensor 1c is not turned on within a predetermined time after the peel detection sensor is turned on, it is determined that a jam has occurred at the paper output section.

Next, the control flow will be explained with reference to FIGS. 3 and 4. First, in step n1, a jam determination is performed by the jam determining means 2a. As a result of the jam determination, if it is determined that a jam has occurred, the process proceeds to step n2, and the jam that occurred between the current number of copies and a preset number of copies before, for example, 1000 copies, is detected. The number of times is calculated and the jam counter 2b
is counted up. The jam counter 2b is counted up every time a jam occurs, regardless of the cause of the jam. Note that if it is determined in step n1 that no jam has occurred, the process advances to step n12.

When the jam counter 2b counts up, the process proceeds to step n3, where the jam cause determining means 2c determines whether the cause of the jam is a preset jam in the paper feed section (cause 1). If it is determined that the jam is in the paper feed section, the process advances to step n4, and the cause-specific jam counter 2d calculates the number of jams for cause 1 of jams that have occurred between the current number of copies and a preset number of times before. is counted up. Next, the process proceeds to step n5, where the cause-specific jam occurrence rate calculation means 2e calculates the jam occurrence rate for jam cause 1 based on the data of the jam counter 2b and the data of the cause-specific jam counter 2d.

If it is determined in step n3 that the cause of the jam is not cause 1, the process proceeds to step n6, where it is determined whether the cause of the jam is a jam at a preset peeling portion (cause 2). If it is determined that the cause of the jam is cause 2, the process advances to step n7, and the cause-specific jam counter 2d calculates the number of jams for jam cause 2 that have occurred between the current number of copies and a preset number of times before. is calculated and counted up. Next, the process proceeds to step n8, where the cause-specific jam occurrence rate calculation means 2e calculates the jam occurrence rate for jam cause 2 in the same manner as for jam cause 1.

If it is determined in step n6 that the cause of the jam is not cause 2, the process proceeds to step n9, where it is determined whether the cause of the jam is a jam in a preset paper output section (cause 3). If it is determined that the cause of the jam is cause 3, the process advances to step n10, and the cause-specific jam counter 2d calculates the number of jams caused by jam cause 3 that have occurred between the current number of copies and a preset number of times before. is calculated and counted up. Next, the process proceeds to step n11, where the cause-specific jam occurrence rate calculation means 2e calculates the jam occurrence rate for jam cause 3 in the same manner as for jam causes 1 and 2.

If it is determined in step n9 that the cause of the jam is not 3, the process advances to step n12. n13 by turning on the operation key 3 provided on the operation panel 26 etc. as necessary during maintenance and inspection
Proceed to the next step.

In step n13, the jam counter 2b
Data on the number of jams that have occurred between the current number of copies counted and a preset number of times before is displayed on the display means 4 on the operation panel 26 for, for example, two seconds.

[0021] Next, the process proceeds to step n14, where it is determined by the jam occurrence rate comparison and determination means 2f by cause whether or not the jam cause data calculated in step n5 is greater than or equal to a preset reference value (for example, 10%). be done. If the result is equal to or greater than the reference value, the process proceeds to step n15, and the jam occurrence rate data for jam cause 1 is displayed on the display means 4 for, for example, 2 seconds. If it is smaller than the reference value, skip step n15 and proceed to step n16.

[0022] From then on, steps n16 to n19
In this step, the comparison and display of jam occurrence rate data for jam cause 2 and jam cause 3 are performed in the same manner as in the case of jam cause 1 described above.

In the above embodiment, processing is performed based on jam data that occurred between the current number of copies and a predetermined number of times before copying. The same process as in the above embodiment may be performed based on the jam data that has occurred up to this point.

Furthermore, in the above embodiment, the jam counter 2b
The counter of the cause-based jam counter 2b is configured to calculate and count the jam data that occurred between the current number of copies and a preset number of times before, but the counters 2b and 2d simply count. The configuration may be such that a separate calculation is performed based on the data.

Furthermore, in the above embodiment, the data on the jam occurrence rate by cause is displayed in comparison with its standard value, but as shown in FIGS. It is compared and determined whether or not the jam data for each cause that occurred up to a predetermined number of times is equal to or higher than the reference value for the number of jam occurrences (for example, 10 times), and if it is greater than or equal to the reference value, the data for each cause is determined. The configuration may be such that the data of the jam counter 2d is displayed.

[0026]

According to the image forming apparatus of the present invention, the jam occurrence situation can be accurately grasped as needed, so that maintenance and inspection by service personnel can be carried out quickly and accurately.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a copying machine according to the present invention.

FIG. 2 is a configuration diagram of main parts of an operation panel section of a copying machine according to the present invention.

FIG. 3 is a control flowchart according to the present invention.

FIG. 4 is a control block diagram according to the present invention.

FIG. 5 is a control flowchart of another embodiment of the present invention.

FIG. 6 is a control block diagram of another embodiment of the present invention.

[Explanation of symbols]

1 Jam detection sensor 2a Jam determination means 2b Jam counter 2c Jam cause determination means 2d Cause-specific jam counter 2e Cause-specific jam occurrence rate calculation means 2f Cause-specific jam occurrence rate comparison and determination means 2g Cause-specific jam data comparison and determination means 4 Display means

Claims (2)

[Claims] 1. A jam detection sensor that detects a jam in a paper conveyance path, a jam determination device that determines whether a jam has occurred based on a signal from the jam detection sensor, and a jam detection device that detects a jam from the jam determination device. In an image forming apparatus including a jam cause determination means for determining the cause of a jam based on a signal, the occurrence of a jam occurrence between the current number of copies and a preset number of times before based on the signal from the jam determination means. a jam counter that counts the number of jams; a cause-based jam counter that counts the number of jams that have occurred by cause from the current number of copies to a predetermined number of times before based on a signal from the jam cause determining means; cause-specific jam occurrence rate calculating means for calculating the cause-specific jam occurrence rate that has occurred between the current number of copies and a predetermined number of times before based on the counter data and the cause-specific jam counter data; and the cause-specific jam occurrence rate calculation means; a means for comparing and determining the jam occurrence rate by cause, which compares and determines the data calculated by the occurrence rate calculation means and a preset reference value of the jam occurrence rate; and, if necessary, a means for comparing and determining the jam occurrence rate by cause. 1. An image forming apparatus comprising: display means for displaying data on jam occurrence rate by cause based on comparative determination results. 2. A jam detection sensor for detecting a jam in a paper conveyance path, a jam determination means for determining whether a jam has occurred based on a signal from the jam detection sensor, and the jam determination means. In the image forming apparatus, the image forming apparatus is provided with a jam cause determining means for determining the cause of the jam based on a signal from the jam determining means, from the current number of copies to a preset number of times before based on the signal from the jam determining means. a jam counter that counts the number of jams that have occurred; a cause-specific jam counter that counts the number of jams that have occurred by cause from the current number of copies to a predetermined number of times before based on a signal from the jam cause determining means; Cause-specific jam data comparison/determination means compares and determines the cause-specific jam counter data with a preset reference value, and if necessary, the cause-specific jam data comparison/judgment means determines the cause. An image forming apparatus comprising: display means for displaying data of a separate jam counter.