JPH01185585A - Image forming device - Google Patents

Abstract

PURPOSE:To prolong cleaning frequency and to reduce cleaning cost by providing a cleaning roller and automatically cleaning the taint of the surface of a white platen roller. CONSTITUTION:The cleaning roller 17 sliding and rotating is provided on the surface of the white platen roller 4 on the opposite side of a platen glass 3. The cleaning roller 17 is made of an extremely soft rubber roller, comes into contact with the white platen roller 4 by its self weight, and removes the taint of the surface of the roller 4. Therefore, the taint of the surface of the white platen roller 4 can be automatically cleaned when the taint of the cleaning roller 17 itself reaches the limit. Thus, the frequency that the white platen roller 4 is manually cleaned can be prolonged, and its cleaning cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention reads an image of a document while conveying the document itself.
The present invention relates to an image forming apparatus that forms an image corresponding to the read image on recording paper.

(Conventional Technique IFi) Conventionally, image forming apparatuses that copy large-sized original images such as AO and A1 versions read the original image while transporting the original itself and form a copied image on recording paper. configured. Specifically, an optical unit is placed in the middle of the document transport path, a white platen roller is placed opposite a platen glass placed on the image reading surface of the optical unit, and the white platen roller and platen glass are connected to each other. The device is configured to read a document image while passing the document through the recording paper, and copy the read image onto recording paper. In this case, the white platen roller is a rubber roller whose surface is coated with white paint, and provides a white background image from the back side of the document.

[Problem to be solved by the invention]

In an image forming apparatus that provides a white background image to a document using a white platen roller as described above, conventionally, the white platen roller and the platen glass on the reading surface of the optical unit are brought into contact with each other without any gap between them. The white platen roller itself is also configured to contribute to document conveyance. For this reason, the white platen roller becomes dirty due to the dirt attached to the original, and when copying the original image drawn on transparent paper, the dirt on the white platen roller appears on the copied image, reducing the image quality of the copied image. The problem arises that it deteriorates. Therefore, it is necessary to clean the white platen roller at appropriate time intervals.
Because the white platen roller is often placed out of reach when handling large-sized documents such as O and A1, it is necessary to partially disassemble the roller and clean it. There was a problem that the work was extremely troublesome and the cost was extremely high.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus that can extend the cleaning cycle of a white platen roller as long as possible and reduce cleaning costs.

(Means for Solving the Problems) The present invention aims to lengthen the cleaning cycle of the white platen roller by providing a cleaning roller that comes into sliding contact with the white platen roller to clean dirt on its surface.

[Operation] Dirt on the white platen roller is cleaned by a cleaning roller that comes into sliding contact with the white platen roller. As a result, it is not necessary to clean the white platen roller until the dirt on the cleaning roller itself exceeds a limit, and maintenance personnel only need to perform cleaning work when the limit is exceeded.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a document conveyance section which is a main part of an image forming apparatus according to the present invention, and an optical unit 2 for reading a document image is disposed in the middle of a document conveyance path 1. As shown in FIG. Also, a white platen roller 4 is provided opposite the platen glass 3 on the image reading surface of the optical unit 2.
is located. Further, a drive roller 6.7 and an eye roller 8 are provided on the upstream and downstream sides of the optical unit 2.
~11 were delivered and sent from the document insertion slot 30 by the drive rollers 12, 39, 37, 35, 33° 31 on the upstream side of the drive roller 6 and the eye rollers 13, 40, 38, 36, 34, 32. The document is conveyed between the platen glass 3 and the white platen roller 4 by a drive roller 6 and a filler roller 8, and the image of the document is read by the optical unit 2 during the conveyance. The original that has passed through the reading surface of the optical unit 2 is sent to the downstream drives 0-57 and the eye roller 1.
0, the document is transported to the exit of the document transport path 1. In this case, a claw 15° 16.51.52.53 for switching the conveyance path is provided on the downstream side of the drive roller 6.7.12° 39.37, and the claw 15 switches the state opposite to the one shown in the figure. When the original document has passed through the reading surface of the optical unit 2, it passes between the drive roller 42 and is ejected toward the rear ejection port 43 for thick originals and long originals.

However, if the document is a thin document of AO size to A4 size, the claw 15 is switched to the state shown in the drawing.

And A3. 11 A4 size manuscripts! When copying several copies, the claw 16 is switched to the opposite state from the one shown, and the document that has been read by the optical unit 2 is placed between the drive roller 7 and the idler roller 11 and between the drive roller 6 and the idler roller 9. , and is again conveyed to the reading surface of the optical unit 2 by the drive roller 6 and idler roller 8. When the set number of copies are completed by such repeated conveyance, the claw 16 is switched to the state shown in the figure, and the document is transferred to the drive roller 1 on the downstream side of the drive roller 56.
2.39.37.35.47 and is discharged to the front discharge port 50.

In the case of an A2 size document, the pawl 51 is switched in place of the pawl 16 in the same way, so that after the document has circulated between the drive roller 7 and the drive roller 12 a number of times equivalent to the number of copies, the drive roller 539°37 .35.47 and is discharged to the front discharge port 50. In addition, in the case of an A1 size original, the pawl 52 is switched in the same way, so that the original circulates between the drive roller 7 and the drive roller 39 a number of times equivalent to the number of copies.
is discharged through the front discharge port 50.

Furthermore, in the case of an AO size original, the pawl 53 is switched in the same way, so that the original circulates between the drive rollers 7 and 37 a number of times equivalent to the number of copies, and then passes through the drive rollers 35 and 47 and forwards. It is discharged to the discharge port 50.

In this way, the conveyance path is switched depending on the document size.

Incidentally, a cleaning roller 17 is provided on the surface of the white platen roller 4 on the opposite side to the platen glass 3, and rotates while slidingly contacting the white platen roller 4.

The cleaning roller 17 is composed of an extremely soft rubber roller, and comes into contact with the white platen roller 4 by its own weight, and removes dirt from the surface of the white platen roller 4. Therefore, the dirt on the surface of the white platen roller 4 can be automatically cleaned until the dirt on the cleaning roller 17 itself reaches its limit.

As a result, the period of manual cleaning of the white platen roller 4 becomes longer, and the cleaning cost can be reduced.

Note that when the cleaning roller 17 reaches its limit of dirt, you can replace it with a new one or reinstall it after cleaning it.
As shown in the embodiment shown in FIG. You may also clean the surface to remove dirt.

(Effects of the Invention) As explained above, according to the present invention, since the cleaning roller is provided to automatically clean the dirt on the surface of the white platen roller, it is necessary to manually clean the dirt on the surface of the white platen roller until the dirt on the cleaning roller itself reaches its limit. There is no need to carry out cleaning by , the W1n cycle can be extended, and as a result, cleaning costs can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram showing one embodiment of the present invention, and FIG. 2 is a cross-sectional configuration diagram showing another embodiment. 1... Original transport path, 2... Optical unit, 3...
・Platen glass, 4...White platen roller, 6,
7... Drive roller, 17... Cleaning roller, 18... Cleaning member, 19... Supply reel, 20... Winding reel, 21... Presser roll. Figure 2

Claims (1)

[Scope of Claims] An image forming apparatus including a white platen roller that faces an optical unit that reads an original image and provides a white back image to an original that is conveyed from an original conveyance path, the image forming apparatus slidingly contacting the white platen roller. An image forming apparatus characterized by being provided with a cleaning roller.