JPH03210572A - image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus using a belt-shaped photoreceptor, and more specifically, the present invention relates to an image forming apparatus that uses a belt-shaped photoreceptor. The present invention relates to an image forming apparatus that reduces damage.

[Conventional technology]

Photoconductors used in image forming devices such as electrophotographic devices, facsimile machines, and laser printers can be roughly divided into three types: drum type using a photoreceptor drum, belt type using a belt-like photoreceptor, and sheet-like photoreceptor. There are three types of sheet systems used, and the drum system and belt system are widely used.

- Around the photoconductor when fishing on a boat, there is an optical system unit that exposes the photoconductor, a charging charger that uniformly charges the photoconductor, a developing device that develops the electrostatic latent image on the photoconductor, and a developing device that develops the electrostatic latent image on the photoconductor. a transfer device that transfers the developed image onto transfer paper; a cleaning device that removes developer remaining on the photoreceptor after transfer;
A discharge lamp and the like are arranged to remove the charge remaining on the surface of the photoreceptor. Among these, a part of the developing device and the cleaning device are in physical contact with the photoreceptor.

Specifically, the developing roller of the developing device is in contact with the photoconductor with developer interposed between them, and the cleaning blade of the cleaning device is in contact with the photoconductor to scrape off excess developer. are doing. Conventionally, in an image forming apparatus using a photoreceptor, the above-described contact between the photoreceptor and each device is necessary due to the principle of image formation, and stable image formation is thereby performed.

[Problem to be solved by the invention]

However, in an image forming apparatus using a conventional belt-shaped photoreceptor, the developing device and the cleaning device are always connected not only during image formation but also when image formation is not being performed, in other words, when the image is stopped. Since the belt-shaped photoreceptors are in contact with each other, and the belt-shaped photoreceptor has the disadvantage of easily generating cracks (cracks are 2 cracks) due to physical stress, unnecessary loads are caused by the contact. There is a problem in that the deterioration of the belt-shaped photoreceptor is accelerated.

In particular, if the belt-shaped photoconductor starts to be driven while the cleaning blade and the belt-shaped photoconductor are still in contact with each other,
There was a problem in that impact caused deterioration and cracks were more likely to occur.

The present invention has been made in view of the above, and its first objective is to reduce the physical stress applied to the belt-shaped photoreceptor.
The purpose of

A second object of the present invention is to reduce the impact at the time of starting driving of the belt-shaped photoreceptor.

[Means for Solving the Problems] In order to achieve the above-mentioned first object, the present invention includes a developing device moving means for bringing the developing device into contact with and away from the heddle-like photoreceptor, and a cleaning device for bringing the developing device into contact with the belt-like photoreceptor. and a cleaning device moving means for separating the belt-like photoreceptor, and a driving means for driving the belt-like photoreceptor, and an image forming apparatus that brings the developing device and the cleaning device into contact with the heald-like photoreceptor only when the heald-like photoreceptor is driven. This is what we provide.

In order to achieve the above-mentioned second object, the present invention includes: a developing device moving means for bringing the developing device into contact with and away from the belt-like photoreceptor; a cleaning device moving means for bringing the cleaning device into contact with and away from the belt-like photoreceptor; It is equipped with a step motor that drives the belt-like photoreceptor, and only when the belt-like photoreceptor is driven, the developing device and the cleaning device are brought into contact with the belt-like photoreceptor, and the step motor starts rotating the heald-like photoreceptor. The present invention provides an image forming apparatus that is driven to slow up and slow down when the rotation is stopped and when the rotation is stopped.

[Effect]

In the image forming apparatus of the present invention, when the heald-like photoreceptor is in a stopped state, the developing device moving means moves the developing device away from the belt-like photoreceptor, and the cleaning device moving means moves the cleaning device away from the belt-like photoreceptor.

Further, when the belt-shaped photoreceptor is in a driving state, the developing device and the belt-shaped photoreceptor are brought into contact with each other by the developing device moving means,
The cleaning device and the belt-shaped photoreceptor are brought into contact with each other by the cleaning device moving means. At the same time, the step motor (driving means) is driven to slow down the driving of the heald-like photoreceptor when it starts rotating, and to slow down the driving when it stops rotating.

〔Example〕

Hereinafter, the image forming apparatus of the present invention will be described in detail based on the drawings.

FIG. 1 shows the configuration of an embodiment of a printing apparatus (laser printer) to which the image forming apparatus of the present invention is applied. The image light beam (laser beam) is irradiated onto the surface of the belt-shaped photoreceptor 102 to form an electrostatic latent image. Around the belt-shaped photoreceptor 102, there are a charging charger 103 that uniformly charges the belt-shaped photoreceptor 102, a developing device 104 that develops the electrostatic latent image on the belt-shaped photoreceptor 102, and a paper conveyance system. A transfer charging unit 105 applies a polarity potential opposite to that of the toner to the guided transfer paper P and transfers the developed image information to the transfer paper, and a cleaning device removes residual toner on the belt-shaped photoreceptor 102. 106 are arranged.

FIG. 2 shows an 08M motor (step motor) 107 that drives the belt-shaped photoreceptor 102, which is the main part of the present invention,
A solenoid (hereinafter referred to as "developing s") that drives the developing roller 104a of the developing device 104.

L) 108 and a solenoid (hereinafter referred to as cleaning SQL) 109 (7) that drives the cleaning blade 106a of the cleaning device 106. Developing 5QL108 and Cleaning 5O
The developing roller 104a and the cleaning blade 106a are moved by L109 to come into contact with and separate from the belt-shaped photoreceptor 102.

The operation of the above configuration will be explained with reference to the flowchart in FIG.

When a predetermined print start command is input to the printing apparatus main body 100, the development SQL 108 and the cleaning SOL
109 (7) Execute ON/OFF switch 7 (repeat ONloFF 50 m5ec 10 times), develop SQL 108 and cleaning 5OL1
Turn on 09. As a result, each unit (developing device 1
04 and the cleaning device 1o6) gently come into contact with the belt-shaped photoreceptor 102 (step 3.1). continue,
The 08M motor 107 is slowly started up by slowing down, and the drive is performed slowly until it reaches a constant rotation speed (steps 302 and 303).

After that, normal printing operation is executed (step 304)
However, if there is no command to print the next page, it is determined that printing has ended (step 305), and the drive step speed of the 08M motor 107 is gradually slowed down, and a slow down stop of the 08M motor 107 is started (step 306). When the slowdown stop of 08M motor 107 is completed, turn off the drive of 08M motor 107.
(steps 307 and 308), OBM-E-tar 1
After 07 stops, development SQL 108 and cleaning 5O
L109 is set to 0FFL (step 309), and each unit is separated from the belt-shaped photoreceptor 102.

As is clear from the above-mentioned operation, in the printing apparatus of this embodiment, the belt-like photoreceptor 102, the developing device 104, and the cleaning device 106 are operated except when the belt-like photoreceptor 102 is being driven.
Since there is no contact with the belt-shaped photoreceptor 102, cracks are less likely to occur due to physical fatigue of the belt-shaped photoreceptor 102, and the life of the belt-shaped photoreceptor 102 can be extended.

In addition, if the belt-shaped photoreceptor 102 has a seam T,
As shown in FIG. 2, by managing the home position HP on the belt-shaped photoreceptor 102, the seam T is controlled to always stop at a position where it is in contact with the cleaning blade 106a. In other words, the belt-shaped photoreceptor 102
When the belt-shaped photoreceptor 102 starts to rotate, the cleaning blade 106a always starts rotating with the seam T in contact with the cleaning blade 106a, so there is no impact on this part, and the life of the belt-shaped photoreceptor 102 can be extended.

〔Effect of the invention〕

As explained above, the developing device moving means of the present invention brings the developing device into contact with and separates from the belt-like photoreceptor, the cleaning device moving means brings the cleaning device into contact with and leaves the belt-like photoreceptor, and the belt-like photoreceptor moves. Since the developing device and the cleaning device are brought into contact with the belt-like photoreceptor only when the belt-like photoreceptor is driven, the physical stress applied to the belt-like photoreceptor can be reduced. .

In addition, in the above configuration, the driving means is composed of a step motor, and is driven to slow up and slow down when the belt-shaped photoreceptor starts and stops rotating. Impact can be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of a printing device (laser printer) to which the image forming device of the present invention is applied;
The figure shows the 08M motor, developing roller, and the main parts of the present invention.
Development SQL, cleaning blade, cleaning SQL
FIG. 3 is a flowchart for explaining the operation of the image forming apparatus of the present invention. Explanation of symbols 100-----Printing device main body 101-----Optical unit 102--Belt-shaped photoreceptor 103-----Charging charger 104-----
-Developing device 104 a--Developing roller 10
5-----...Transfer charger 106------
-Cleaning device 106 a---Cleaning blade 107---OB M motor 1
08----1 development SOL T-------1 seam
09 -・-Cleaning SQL Transfer Paper HP・-Home Position Patent Applicant Stock Figure 3

Claims (2)

[Claims] (1) A belt-shaped photoconductor that forms an electrostatic latent image, a developing device that develops the electrostatic latent image using toner, and collection of unused toner that remains on the belt-shaped photoconductor after being transferred to transfer paper. an image forming apparatus comprising: a developing device moving means for bringing the developing device into contact with and away from the belt-like photoreceptor; and a cleaning device moving means for bringing the cleaning device into contact with and away from the belt-like photoreceptor. and a driving means for driving the belt-like photoreceptor, and the developing device and the cleaning device are brought into contact with the belt-like photoreceptor only when the belt-like photoreceptor is driven. Forming device. (2) The image forming apparatus according to claim 1, wherein the driving means includes a step motor, and is driven to slow up and slow down when the belt-shaped photoreceptor starts rotating and stops rotating.