JPS5928182A - Picture forming device - Google Patents

Abstract

PURPOSE:To prevent bad influences on physical and chemical characteristics of a photoreceptor, to facilitate on exchange of the photoreceptor, and to eliminate the need of an electric circuit, etc. for controlling contact and separation of a cleaning blade by constituting a titled device so as to bring a cleaning blade in or not of contact with the photoreceptor in interlocking with reciprocation of a reciprocating device for exposing an original in a device that removes the developer remaining on the photoreceptor by the cleaning blade. CONSTITUTION:When copying action is started, a photoreceptor 3 rotates and an original placing table 2 goes forward. Immediately after the forward movement, junction of a roll 15 and a lever 12 is released, and a cleaning blade 10 is brought into pressure contact with the surface of the photoreceptor 3 as shown by imaginary lines. Accordingly, the developer (a) remaining on the photoreceptor can be removed. When copying action is completed and the original placing table 2 returns to a specified stop position, the roll 15 is engaged with the lever 12, and the cleaning blade 10 is separated from the surface of the photoreceptor 3 as shown by solid lines.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus that uses a cleaning blade to remove developer remaining on a photoreceptor.

[Technical background of the invention and its problems]

For example, in the cleaning method of electronic copying machines,
A blade cleaning method is conventionally known as a method having relatively high cleaning effectiveness. In this blade cleaning method, the cleaning blade is constantly pressed against the surface of the photoconductor, but it is inconvenient when replacing the photoconductor, and unnecessary pressure is applied to the photoconductor, causing physical and chemical damage to the photoconductor surface. Problems such as changes in physical characteristics may occur,
Recently, it has been practiced to move a cleaning blade toward and away from a photoreceptor. However, in order to perform excitation or demagnetization control using a cleaning play, an electric circuit is required to bring the cleaning blade into contact with the photoreceptor for the time required for cleaning, for example, to change the contact time depending on the document size. The disadvantage is that it is complicated.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its objectives are to not adversely affect the physical and chemical properties of the photoreceptor, to facilitate the replacement of the photoreceptor, and to control the cleaning blade's contact and separation. An object of the present invention is to provide an image forming apparatus that does not require an electric circuit or the like for image forming and can be simplified in configuration.

[Summary of the invention]

The present invention provides an image forming apparatus equipped with a reciprocating means for exposing an original in which developer remaining on a photoreceptor is removed using a cleaning grade. The cleaning blade is characterized in that it is configured to move toward and away from the photoreceptor.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 denotes a main body of an electronic copying machine, which is an image forming apparatus.A document mounting table 2 is provided on the upper surface of the main body of the electronic copying machine, and is moved back and forth by a drive motor (not shown) provided in the main body 1. Note that the moving distance changes depending on the document size. l'L l' inside main body 1
! A drum-shaped photoreceptor 3 that rotates in a predetermined direction in synchronization with the original document mounting table 2 is pivotally supported at the center. Photoreceptor 3
A transfer device 4 and a cleaning device 5, which will be described later, are arranged around the . A transport path 6 for transfer paper P passes between the transfer device 4 and the photoreceptor 3, and its base end is connected to a paper feed device 7, and its end is connected to a paper output tray 9 via a fixing device 8. ing.

The cleaning device 5 is constructed as follows.

That is, 10 is a cleaning blade for removing untransferred developer a remaining on the surface of the photoconductor 3, and the base end is attached to the rotating shaft 1, and the tip can freely approach and separate from the surface of the photoconductor 3. It becomes. A lever 12 is attached to the rotation shaft 11.
The proximal end of the cleaning blade 10 is attached so that it rotates integrally with the cleaning blade 10. This lever 12 is biased by a spring 13 to rotate in a direction in which the tip approaches the document table 2, that is, in a direction in which the IJ-Jung blade 10 comes into pressure contact with the surface of the photoreceptor 3, and a stopper 14 limits its rotation range. regulated.

Further, a roller 15 attached to the document placing table 2 is engaged with the tip of the lever 12 at a substantially predetermined stop position of the document placing table 2, and at this time, the roller 15 is engaged against the biasing force of the sliding ring 13. lever 12 and cleaning brake)
``Rotate the IO and move the cleaning blade 10 to the photoreceptor 3.
It is designed to be separated from the surface.

When the copying operation is started, the photoreceptor 3 rotates and the original table 2 moves forward.

Immediately after the original table 2 moves forward, the engagement between the roller 15 and the lever 12 is released, and the cleaning blade 10 comes into pressure contact with the surface of the photoreceptor 3 as shown by the imaginary line in the figure. Therefore, the developer a remaining on the photoreceptor 3 can be removed.

Further, when the copying operation is completed, that is, when the document mounting table 2 returns to the predetermined stop position, the roller 15 moves to the lever 12.
, and the cleaning blade 10 is separated from the surface of the photoreceptor 3 as shown by the solid line in the figure. Therefore, the photoreceptor 3 can be easily replaced. Further, since no unnecessary pressure is applied to the photoreceptor 3, the physical and chemical properties of the surface of the photoreceptor 3 are not adversely affected. Furthermore, since the IJ-Jung grade 10 is moved toward and away from the photoreceptor 3 in conjunction with the reciprocating movement of the document placement table 2, a solenoid for moving the cleaning blade 10 toward and away from the photoreceptor 3, and a There is no need for an electric circuit or the like to change the contact time accordingly, and the configuration can be simplified.

Next, a second embodiment of the present invention will be described with reference to FIG. In this figure, the same components as those in FIG. That is, a fixed document placement table 16 is provided on the upper surface of the main body 1, and an exposure system 17 is provided between the document placement table 16 and the photoreceptor 3.

The exposure system 17 has a lens house 18 that moves back and forth in synchronization with the rotation of the photoreceptor 30. A row 215 is attached to the lens house 18, and the lens house 18 is at a predetermined stopping position. It engages with the lever 12 to separate the cleaning grade 10 from the photoreceptor 3. Even with this configuration, the same effects as in the first embodiment can be achieved.

〔Effect of the invention〕

As explained above, according to the present invention, in an image forming apparatus equipped with a reciprocating means for exposing an original, the developer remaining on the photoreceptor is removed using a cleaning grade, the reciprocating means is Since the cleaning blade is moved toward and away from the photoreceptor in conjunction with the reciprocating movement, it does not adversely affect the physical and chemical properties of the photoreceptor, and the photoreceptor can be easily replaced. There is no need for an electric circuit or the like to control the approach and separation of the cleaning blade, resulting in excellent effects such as a simplified configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing a second embodiment of the present invention. 2... Document mounting table, 3... Photoreceptor, 10... Cleaning grade, a... Developer, 17... Exposure system.

Claims (2)

[Claims] (1) In an image forming apparatus equipped with a reciprocating means for exposing an original in which the developer remaining on the photoreceptor is removed by a cleaning blade, the cleaning is performed in conjunction with the reciprocating movement of the reciprocating means. An image forming apparatus characterized in that a blade is configured to move toward and away from a photoreceptor. (2) The cleaning blade is configured to contact the photoreceptor immediately after the reciprocating means moves forward for exposure, and separates from the photoreceptor after the reciprocating means returns. Image forming device.