JP2667476B2 - Jam display device of paper transport device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jam display device for displaying when a paper jam has occurred in an apparatus having a paper conveying device such as a copying machine.

2. Description of the Related Art There is known a jam display device that indicates at which position on a conveyance path a sheet stops when a sheet is conveyed by a sheet conveyance device while the sheet is being conveyed.

However, as copiers and the like become larger and more multifunctional, the length of the paper conveyance path becomes longer. Therefore, when a jam occurs, simply displaying the stop position of the paper may cause a jam and stop the conveyance. Since the stop position of both the paper that has been conveyed and the paper that has been conveyed normally but has stopped due to a jam is displayed, the display contents are complicated, and there is a disadvantage that a defective portion of the conveyance device cannot be found accurately. Was.

In order to solve such disadvantages, for example, Japanese Patent Application Laid-Open
In the publication 178370, when a paper jam occurs when a plurality of papers are present in the conveyance path, the position of all the papers being conveyed is displayed, and the paper that has been conveyed properly is jammed. A jam display device has been proposed in which the display on the paper is changed.

Further, Japanese Patent Application Laid-Open No. 61-197347 proposes a technique in which display contents are made different depending on whether a jam that has occurred in a conveyance path is a delay jam or a stagnant jam.

<Problem to be Solved by the Invention> One purpose of a jam display device is to notify a user of a location where a jam has occurred and to allow the user to smoothly clear the jam. Considering the purpose, if the display content of the jam display device is complicated,
The user may be confused by the display content, take time to grasp the location where the jam has occurred, or may misunderstand the display error. Since the display of any of the jam display devices described in the above-described prior art is relatively complicated, it is hard to say that the display is appropriate for a user.

On the other hand, another purpose of the jam display device is to provide a serviceman with information for accurately finding a defective portion that causes a jam. In order to provide such information, it is necessary that the displayed contents be as detailed as possible. In other words, another purpose of the jam display device is
The purpose is not to improve the workability at the time of jam clearance but to provide detailed information to the extent that the cause of the failure can be investigated. If anything, the conventional jam display device has been improved in terms of display for servicemen.

However, since the jam display device originally has two purposes, a device that satisfies both purposes is desired. Conventional jam display devices do not satisfy both purposes.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a jam display device of a paper transport device that satisfies both of these objects.

<Means for Solving the Problems> The present invention relates to a jam display device of a paper transport device for displaying a location where the jam occurs when a jam occurs in the paper being transported and the transport operation stops. First display means for displaying a relatively small first display, second display means for displaying a relatively large second display, and display switching means capable of switching between the first display and the second display. The display switching means includes a cover plate capable of covering the second display, and in a state where the cover plate covers the second display, the second display is selectively blocked by the cover plate. A jam display device of a paper transport device, wherein a first display is displayed on a surface of the cover plate.

Further, in the jam display of the paper transporting device, the first display is mainly a display for a user, and an operation block to be operated at the time of clearing the jam is displayed so that the clearing operation can be easily performed. Is a display mainly for a service person, and is characterized in that information indicating a sheet stop position in the sheet conveying device in the event of a jam occurrence is included in as much detail as possible.

<Operation> Since the display switching means switches between the first display and the second display, the user can select a desired display.

Since the first display has a relatively small display content and is mainly a display for the user, if this display is selected, it is easy to grasp the operation portion at the time of clearing the jam.

Further, the second display has a relatively large display content and is mainly for a service person, so that it is possible to know the paper stop position and the like in detail, and to provide information for investigating the cause of the jam.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described by taking a paper conveying device of a copying machine as an example.

FIG. 2 shows a copying machine 10 to which an embodiment of the present invention is applied.
FIG. 2 is a schematic cross-sectional view showing the internal configuration of the device. Contact glass
Document 13 set on 11 and covered with document cover 12
When the copying process is started, the illumination is performed by the illumination lamp 14.
The light reflected by the document 13 is guided by an optical system 16 including a plurality of reflecting mirrors and a condenser lens 15 and is provided to a photosensitive drum 17. The illumination lamp 14 and a predetermined reflecting mirror are moved in the direction of arrow A1, and perform illumination scanning from the front end to the rear end of the document 13.

The photoconductor drum 17 is rotated at a constant speed in the direction of arrow A2 during the copying process, and
The surface of the drum 17 charged to a constant potential at 18 is exposed by the reflected light from the document 13, and an electrostatic latent image of the document 13 is formed. This electrostatic latent image is developed into a toner image by the developing device 19. Then, the toner image is transferred to a sheet of paper that has been sent, and the surface of the photoconductor drum 17 after the transfer of the toner image to the sheet is cleaned by a cleaner 20 to be charged for the next copy.

The paper transport mechanism in the copying machine 10 is as follows. That is, the paper in the paper cassette 21 is
The paper in the paper cassette 22 is taken out by the paper feed roller 24 and guided to the photosensitive drum 17 by the paper feed path 25. A feed roller pair for conveying paper is provided in the paper feed path 25.
There are provided a pair of registration rollers 28 and 27 and a registration roller 28 for setting the timing of giving a sheet to the photosensitive drum 17. The sheet supplied to the photosensitive drum 17 has a transfer charger 29
The toner image is transferred. The sheet on which the toner image has been transferred is separated from the photosensitive drum 17 by the action of the separation charger 30. The separated sheet is sent to the fixing device 32 by the belt conveying device 31. The fixing device 32 heats and fixes the toner image on the sheet. Then, the sheet on which the toner image is fixed is discharged to a discharge tray 34 via a pair of discharge rollers 33.

Further, the transport mechanism has a sheet detection switch for detecting the sheets ejected from the sheet cassettes 21 and 22, respectively.
35, 36, a paper detection switch 37 for detecting the paper supplied to the registration roller pair 28, a paper detection switch 38 for detecting the paper fed by the belt conveyance device 31, and detecting the paper supplied to the fixing device 32 And a plurality of paper detection switches such as a paper detection switch 39 for detecting a discharged paper. Based on the outputs of the paper detection switches 35 to 40 and the output of a timer activated based on the output, the position and the transport state of the paper on the transport path are detected.

Also, although not shown, when a paper jam occurs in the transport mechanism, a part of the paper feed path 25, the belt transport device 31, and the fixing device 32 are separately operable for the jam clearing operation. I have.

FIG. 3 is a diagram showing an external configuration of the copying machine 10, and is a perspective view in a state where the front door 41 is opened. When the front door 41 of the copier 10 is opened, a jam display device 42 is provided on the upper left side.

FIG. 4 is an illustrative view showing a cross-sectional structure of the jam display device 42 of FIG. As shown in FIG. 4, a jam display device
42, an LED substrate 43 provided therein, a plurality of LEDs 44 arranged on the LED substrate 43, a second display plate 46 disposed in front of the LED 44, and a second display plate 46 disposed in front of the second display plate 46. First
A display plate 45 is included. The first display panel 45 is rotatable forward about its lower edge. 1st display board 45
However, in the closed state shown in the drawing, the changeover switch 47 is turned on, and when the first display panel 45 is opened forward, the changeover switch 47 is turned on.
47 is turned off.

On the first display plate 45 and the second display plate 46, an illustrative view of a sheet conveying path of the copying machine 10 is displayed.

FIG. 1A shows a display example of the first display board 45, and FIG. 1B shows
7 shows a display example of the second display panel 46. As shown in FIG. 1A, the first display panel 45 is mainly for the user and includes relatively few display portions, and the LED 44 (see FIG. 4) is selectively turned on. Either is lit. On the other hand, the second display panel 46 is mainly for a serviceman, and includes a relatively large number of display locations as shown in FIG. 1B, and the LED 44 is selectively turned on.
Is selectively turned on.

FIG. 5 is a block diagram showing the configuration of the control circuit of the jam display device 42. The jam display device 42 is connected to the CPU 48 and its display is controlled by the CPU 48. The changeover switch 47 is also connected to the CPU 48.

Note that the CPU 48 may control not only the display of the jam display device 42 but also the entire copier 10.

FIG. 6 is a flow chart showing the operation of the control circuit of FIG. According to the flow of FIG.
The operation will be described as follows.

When a jam occurs somewhere on the conveying path, the copying machine 10
A signal is sent to U48 to notify the location of the jam. This is given from paper detection switches 35 to 40 provided on the conveyance path of the copying machine 10. Alternatively, a timer may be started based on the outputs of the paper detection switches 35 to 40, and the location where the jam has occurred may be determined based on the timer output.

When the CPU 48 determines that a jam has occurred (step S1), the CPU 48 further determines the state of the switching step 47 (step S2).
When the changeover switch 47 is on, the first display plate 45 is in the closed state. In this state, the jam display mainly for the user shown in FIG. 1A is performed (step S4). In other words, any one of the relatively few display locations is displayed, and the location where the jam has occurred and the location of the operation necessary for clearing the jam are displayed in an easily understandable manner.

On the other hand, in the state where the first display panel 45 is opened, the switching step 47 is turned off, and the display content is, as shown in FIG. 1B,
The second display is mainly for a service person. In this case, the CPU 48 displays all the detected contents. That is,
In order to provide as detailed information as possible to the service person, a relatively large number of display portions are selectively turned on so that the service person can easily find the cause of the jam.

In the above embodiment, the changeover switch 47 is switched depending on whether the first display plate 45 is closed or opened, and the display content of the jam display device 42 is electrically switched. It can also be set as a simple structure.

That is, both the first display board 45 and the second display board 46 are made of a transparent or translucent material. Further, LEDs having different emission colors are combined with the plurality of LEDs 44. The second display panel 46 is colored in a color that allows all of the different lights from the plurality of LEDs 44 to pass through, and the first display panel 45 allows only the light of the LED 44 of the predetermined emission color to pass therethrough among the plurality of LEDs 44. Color to the desired color. For example, LE that the first display board 45 does not want to pass
Colored to a color complementary to the emission color of D44. Then, the light emission of the LED 44 seen through the first display board 45 is changed to the predetermined LED.
Can only be restricted to With such a configuration, the display location of the first display plate 45 can be limited. Therefore, electrical switching is unnecessary, and depending on whether the first display panel 45 is closed or opened,
Display contents can be switched.

Instead of making the first display panel 45 translucent as described above, a window may be formed in the first display panel so that only the light emission state of the predetermined LED 44 can be visually recognized through the window.

In the above-described embodiment, a predetermined number of display locations are scattered along the schematically illustrated transport path, and the display locations are selectively illuminated and displayed so that a jam occurrence location or the like is displayed. However, instead of this, for example, using a liquid crystal display device or the like, a message "Jam in the paper feed unit." Is displayed for the user, and a symbol "1" is displayed for the serviceman. You may. Alternatively, both of them may display a message so that they can be switched.

In the above-described embodiment, a third display for displaying a location requiring maintenance or the like, which can be switched between the first display and the second display, may be added.

<Effect of the Invention> Since the present invention is configured as described above, it is possible to switch the jam display according to the purpose, and to appropriately display the contents that both the user and the serviceman want to know. A jam display device can be provided.

Further, only the display is switched, and the space of the display unit is the same as that of the conventional device, so that the display device does not become expensive.

[Brief description of the drawings]

FIG. 1A is a diagram mainly showing display contents for a user in a jam display device according to an embodiment of the present invention. FIG. 1B is a diagram mainly showing display contents for a service person in the jam display device according to one embodiment of the present invention. FIG. 2 is a sectional view showing a schematic internal configuration of a copying machine to which one embodiment of the present invention is applied. FIG. 3 is a perspective view showing an external configuration of the copying machine. FIG. 4 is an illustrative view of a sectional configuration of a display device provided in the copying machine. FIG. 5 is a block diagram of a control circuit of the jam display device. FIG. 6 is a flowchart showing the operation of the control circuit of FIG. In the figure, 10 ... copier, 21,22 ... paper cassette, 2
5: paper feeding path, 31: belt transport device, 32: fixing device, 33: discharge roller pair, 35, 36, 37, 38, 39, 40 ... paper detection switch, 42: jam display device , 45... A first display panel, 46... A second display panel, 47.

Claims (2)

(57) [Claims] When a jam occurs in a sheet being conveyed and a conveyance operation is stopped, a relatively small first display is provided in a jam display device of a sheet conveyance device for displaying a place where the jam occurs and the like. First display means for displaying; second display means for displaying a relatively large number of second displays; and display switching means capable of switching between the first display and the second display. Includes a cover plate capable of covering the second display, and in a state where the cover plate covers the second display, the second display is selectively blocked by the cover plate, and the first display is provided on the surface of the cover plate. A jam display device for a paper transport device, wherein a display is provided. 2. The first display is mainly for a user, and displays an operation block to be operated at the time of clearing a jam so that a jam clearing operation can be easily performed. The second display is mainly for a serviceman. 2. The jam display device of the paper transport device according to claim 1, wherein the display includes information indicating a paper stop position in the paper transport device when a jam occurs in as much detail as possible.