JPS6243318Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a cleaning web made of nonwoven fabric, etc. that moves between a feed shaft and a take-up shaft in order to remove toner adhering to a roller in a toner image forming apparatus such as an electrophotographic copying machine. This relates to an image forming apparatus that removes and cleans toner from the roller surface by bringing it into pressure contact with the roller surface, and in particular, a web for removing and cleaning toner adhering to the roller in a contact heating fixing device of a toner image forming apparatus. The present invention relates to a cleaning device.

FIG. 1 shows an example of a conventional web cleaning device used for cleaning the contact heating fixing device as described above. In the figure, 1 is the fixing roller, 2 is the cleaning web, and 3 is the fixing roller 1.
a pressure roller made of an elastic body for pressure contact with the
5 indicates a web winding shaft, and 5 indicates a feeding shaft. Further, arrow 6 indicates the rotation direction of the fixing roller 1;
indicates the direction in which the cleaning web is fed.

The paper on which the toner image has been formed passes over the entry guide 8, and then passes through the heated fixing roller 1 and pressure roller 9.
The paper passes between the paper discharge rollers 10 and is discharged to the outside. The toner image is thermally fused and fixed on the paper when the paper passes between the rollers 1 and 9. Note that the toner image supporting surface of the paper is pressed against the roller 1.

In such a contact heat fixing device, when the machine stops with the paper being held between the fixing roller 1 and the pressure roller 9 (hereinafter referred to as a jam), a conventional user would process the paper using the following procedure.

(1) When you see the message that there is a jam, open the jam removal door (front door or paper ejection side door).

(2) Check the location of the jam, and if the paper is caught in the fixing section, manually rotate either the fixing roller 1 or the pressure roller 9 to eject the paper.

(3) Check to see if there is a jam elsewhere, and if there is no jam, press the jam reset button.

(4) Close the jam processing door and start copying.

At step (2) of the jam processing procedure, the user can rotate rollers 1 or 9 in any direction when taking paper, so if the cleaning web delivery shaft is configured to be freely rotatable, Unused portions of the web are fed out more and more, and the web becomes slack and does not come into even pressure contact with the surface of the fixing roller 1.

The purpose of the present invention is to improve the above-mentioned drawbacks of conventional web cleaning devices and to provide a web cleaning device that prevents unnecessary web feeding and sagging when handling accidents such as paper jams. The present invention is intended to provide an image forming apparatus, and the feature of the present invention is that the cleaning web sent out to the surface of a cleaning web sending shaft and a fixing roller of a fixing section that fixes an unfixed toner image onto an image support. In an image forming apparatus, the image forming apparatus includes a support body that integrally supports a pressure roller that presses the cleaning web and a take-up shaft that winds up the pressed cleaning web, and a support shaft that movably supports the support body. The opening/closing member acts on the opening/closing member and the support body to pressurize the cleaning web around the support shaft to a cleaning position where it comes into pressure contact with the surface of the fixing roller. A support moving means for moving the support around the support shaft and moving the cleaning web to a non-cleaning position separated from the surface by displacing a member that acts on the body. Located in the image forming device.

The present invention will now be described in detail with reference to the embodiments shown in FIGS. 2 and 3. In FIGS. 2 and 3, the same parts as shown in FIG. 1 are designated by the same numbers.

The web cleaning device shown in FIG. 2 moves a cleaning web 2 made of nonwoven fabric between a feed shaft 5 and a take-up shaft 4 to a roller 1 in order to remove toner attached to a fixing roller 1 in a contact heating fixing device. This roller is designed to remove and clean toner from the surface of the roller 1 by pressing it against the surface of the roller 1, and the cleaning web 2 moving between the feed shaft 5 and the take-up shaft 4 is pressed against the surface of the roller 1. 3 are mounted on one support 11, and the support 11 is placed in the cleaning position where the cleaning web 2 is pressed against the surface of the roller 1 (the position shown in FIG. The support body 11 is movably arranged between a non-cleaning position away from the surface (the position shown in FIG. 3), and when the processing door, which is opened when handling an accident such as a paper jam, is closed, the support body 11 is moved to the cleaning position (the position shown in FIG. 2
It is characterized in that the support body 11 is linked to the processing door so that the support body 11 is held in the processing door (FIG. 3) and moved to the non-cleaning position (FIG. 3) when the door is opened.

In order to be able to move said support 11 between a cleaning position and a non-cleaning position, in the illustrated embodiment:
The support body 11 is rotatably mounted around a shaft 12 and rotated counterclockwise by a spring 13. Therefore, a restraining member 14 is provided to restrain the support body 11 from rotating.
A processing door (not shown), which is opened when handling an accident such as a paper jam, is arranged so that the support body 11 is held in the cleaning position when the door is closed, and the support body 11 is moved to the cleaning position when the door is opened. It is linked to. In the figure, reference numeral 15 indicates a stop that limits the movement of the support 11 when it is moved to the non-cleaning position.

According to the present invention, as described above, when the processing door is opened in order to dispose of an accident such as when a jam occurs, the entire cleaning device moves to the non-cleaning position shown in FIG. Therefore, since the cleaning web does not come into contact with the roller 1 when performing the above-mentioned jam processing procedure (2), excessive feeding and slacking of the web can be completely prevented.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional web cleaning device, Fig. 2 is a side view showing a web cleaning device of an image forming apparatus according to the present invention, and Fig. 3 is similar to Fig. 2 showing the operation of the device of the present invention. FIG. 1... Fixing roller, 2... Cleaning web, 3... Pressure roller, 4... Winding shaft, 5...
...Feeding shaft, 8...Entry guide, 9...Pressure roller, 10...Sheet discharge roller, 11...Support, 12
... shaft, 13 ... spring, 14 ... restraining member, 15
...stop.

Claims (1)

[Claims for Utility Model Registration] A cleaning web brought into pressure contact with a cleaning web sending shaft and a pressure roller that presses the sent cleaning web against the surface of a fixing roller of a fixing unit that fixes an unfixed toner image onto an image support. In an image forming apparatus, the image forming apparatus includes a support body that integrally supports a take-up shaft for winding up a winding shaft, and a support shaft that movably supports this support body. pressurizing the cleaning web around the support shaft to a cleaning position where it comes into pressure contact with the surface of the fixing roller, and displacing the member acting on the support body in conjunction with the opening operation of the accident handling opening/closing member. An image forming apparatus comprising: support moving means for moving the support around the support shaft and moving the cleaning web to a non-cleaning position spaced from the surface.