JPH04129941A - Image forming device conveyance 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] [Industrial application field] The present invention relates to a conveying device for an image forming apparatus.

More specifically, the present invention relates to a conveying device that electrostatically attracts and conveys recording paper forming grooves.

[Prior Art] Wet electrophotographic devices are used to record visible images using photoconductive and electrostatic phenomena. Photosensitive paper (recording paper) that was developed in this wet electrophotographic device
A conveyance device for peeling off the exposure drum from the exposure drum and conveying it for drying is generally constructed as shown in FIG.

That is, in order to expose and develop the photosensitive paper S, an exposure drum 1 holds the photosensitive paper S and is rotatable in the direction of the arrow.
An end portion of a conveyor belt 2 is disposed close to the drive roller 3 and the rollers 4a, 4
It is supported by b. The conveyor belt 2 is configured to be rotatable in the direction of the arrow under the driving action of a drive motor 5 connected to a drive roller 3.

Heat fixing rollers 6a and 6b are arranged close to the conveyor belt 2, and a drive motor 7 is connected to the heat fixing roller 6a.
are connected. The drive motor 5 and the drive motor 7 are
It is connected to the control circuit 8 and the control circuit 9, and the conveyor belt 2
The feed speed and the circumferential speed of the discharge roller 6a are controlled to be approximately the same as the circumferential speed of the exposure tram I.

On the conveyor belt 2, a static eliminating brush 12 and a charging brush 13 are arranged close to the drive roller 3 and close to the roller 4b, respectively. This static eliminating brush I2 is grounded, while this charging brush 13 is connected to a high voltage power source I4. A drying fan I5 is disposed above the conveyor belt 2 and facing the conveyor belt 2.

As shown in FIG. 5, the photosensitive paper S has a three-layer structure, in which a base paper, a conductive layer B made of a conductive resin, and a photoreceptor layer C are laminated. Conductive paint is provided at both ends in the direction (direction of arrow Y) perpendicular to (direction of arrow X).

Next, the operation of the conventional conveyance device configured as described above will be explained. The photosensitive paper S held on the exposure drum 1 is charged by a charger (not shown), and the conductive paper S constituting the photosensitive paper S is charged with a charger (not shown). Layer B is electrically connected to the exposure drum I, which is maintained at Ov, via a conductive paint. Therefore, only the surface of the photoreceptor layer C is charged.

Therefore, when an image is exposed on the photosensitive paper S, only the exposed portion becomes conductive and the accumulated charges flow to the conductive layer B, forming an electrostatic latent image on the photosensitive paper S. After this electrostatic latent image is developed with liquid toner, the photosensitive paper S is peeled off from the exposure drum 1 by a peeling means (not shown) and sent to the conveyor belt 2 side. At this time, the drive motor 5 is rotationally driven via the control circuit 8, and the drive roller 3 sends the conveyor belt 2 in the direction of the arrow. As a result, the photosensitive paper S is transferred to the conveyor belt 2, and the charging brush 13 is connected to the high voltage power source 14 at Ikv~3k.
A voltage of v is applied, the conveyor belt is charged, and the photosensitive paper S is electrostatically attracted onto the conveyor belt 2.

When the photosensitive paper S is conveyed by the conveyor belt 2, the drying fan I5 is driven and drying of the output image formed on the photosensitive paper S is started.

After this drying is completed, the drying fan 15 is stopped, while the conveyor belt 2 and the heat fixing roller 6a16b are driven at approximately the same speed via the drive motors 5 and 7, and the photosensitive paper S is discharged to the outside. be done. After the photosensitive paper S is discharged, the charge on the conveyor belt 2 is removed by the charge removal brush 12.

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, the leading end side of the photosensitive paper S is placed on the conveyor belt 2, and the photosensitive paper S
When the rear end side is placed on the exposure drum 1, charges are accumulated on the conductive layer B via the base paper A. For this reason,
Between the surface of the conveyor belt 2 to which a voltage of lkv to 3kv is applied and the conductive paint of the photosensitive paper S, and between the surface of the exposure drum 1 maintained at OV and the conductive paint. There is a problem that electric discharge occurs.

The present invention was made to solve this type of problem, and when the recording paper is transferred to a conveyor belt for drying after development, electric discharge occurs through the recording paper. It is an object of the present invention to provide a conveying device for an image forming apparatus that can effectively prevent the above problems.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a conveyance device of an image forming apparatus according to the present invention includes a conveyance belt that electrostatically attracts and conveys the recording paper after development, and a conveyor belt that electrostatically attracts and conveys the recording paper, a conductive portion provided on the conveyor belt corresponding to a position where an end portion of the conveyor belt I is disposed, a static eliminating means that contacts the conductive portion and the conveyor belt, and a static eliminator in contact with the conductive portion and the conveyor belt I・Charging means in contact with .

[Function] In the conveying device of the image forming apparatus according to the present invention having the above-mentioned configuration, when the recording paper after development is transferred onto the conveying belt, the recording paper is charged by the charging means that is in contact with the conveying belt. The recording paper is electrostatically attracted. At this time, the static eliminating means is in contact with a conductive part provided on the conveyor belt, and the edge of the recording paper, that is, the conductive paint is placed in this conductive part and comes into direct contact with the conveyor belt. do not have. Therefore, it is possible to effectively prevent charges from accumulating inside the recording paper.

[Example] An example of the conveying device of the nine image forming apparatuses according to the present invention is as follows:
A detailed description will be given with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a conveyance device of a wet electrophotographic apparatus according to the present embodiment, FIG. 2 is an enlarged explanatory diagram of a static eliminating means constituting the conveyance device, and FIG. 3 is an illustration of a charging means constituting the conveyance device. It is an enlarged explanatory diagram.

In FIG. 1, reference numeral 20 indicates a conveying device according to this embodiment. This conveying device 20 includes a conveying belt 22 that electrostatically attracts and conveys the photosensitive paper (recording paper) S after development, and both ends of the photosensitive paper S where the conductive paint is provided. Conductive parts 24a and 24b provided on the conveyor belt 22 corresponding to positions, and the conductive part 24a.
, 24b and the conveyor belt 22, and a charging means 28 that is in contact with the conveyor belt 22 and not in contact with the conductive parts 24a, 24b.

The conductive parts 24a and 24b are made of conductive resin, are provided on the conveyor belt 22 with a predetermined width, are parallel to each other, and are configured in the shape of an endless belt.

As shown in FIG. 2, the static eliminating means 26 includes a static eliminating brush 30.
This static elimination brush 30 is equipped with a conductive portion 24a, 24
b and is evenly in contact with the conveyor belt 22.

The charging means 28 includes a charging brush 32 as shown in FIG.
This charging brush 32 is equipped with a conductive portion 24a, 24
b and is in even contact with the conveyor belt 22 in a non-contact state.

In the conveying device 20, the same reference numerals as in the conventional conveying device (see FIG. 4) indicate the same components, and detailed explanation thereof will be omitted.

Next, the operation of the transport device 2o configured as described above will be explained.

The photosensitive paper S is held on the exposure drum 1 and subjected to exposure and development processing while rotating integrally with the exposure drum 1 in the direction of the arrow.
It is peeled off from the exposure drum I by a peeling means (not shown) and sent to the conveyor belt 22 side. Here, the drive motor 5 is driven and the conveyor belt 22 is sent in the direction of the arrow under the rotation of the drive roller 3, and the photosensitive paper S is placed on the conveyor belt 22 from its leading end.

At that time, a charging brush 32 constituting the charging means 28 is connected to the conveyor belt 22 via a high voltage power source 14 at Ikv to 3k.
A voltage of v is applied, and the photosensitive paper S is electrostatically attracted to the conveyor belt 22.

In this case, in this embodiment, since the charging brush 32 is not in contact with the conductive parts 24a, 24b provided on the conveyor belt 22, no voltage is applied to the conductive parts 24a, 24b.

On the other hand, since the static eliminating brush 30 is in contact with the conductive parts 24a and 24b, the conductive parts 24a and 24b are grounded, and no charge is accumulated on the conductive layer B of the recording paper S. Therefore, especially when the recording paper S is transferred from the exposure drum 1 to the conveyance belt 22, the space between the recording paper S and the exposure drum 1 and between the recording paper S and the conveyance belt 22 is
The effect is that it is possible to prevent discharge from occurring between the two.

When the photosensitive paper S is sent out to the conveyor belt 22 side, the drying fan 15 is driven to start blowing air onto the photosensitive paper S. After the drying is completed, the driving of the drying fan 15 is stopped, and the conveyor belt 22, the heat fixing roller 6a,
6b is conveyed at approximately the same speed via the drive motor 5 and the drive motor 7, and the photosensitive paper S is transferred to the heat fixing roller 6a,
6b to the outside. After that, the static elimination brush 30
As a result, the electric charge on the conveyor belt 22 is eliminated.

[Effects of the Invention] As described in detail in Section 2, in the conveyance device of the image forming apparatus according to the present invention, when the recording paper after development is transferred onto the conveyance belt, the end portion of the recording paper is However, since it comes into contact with a conductive portion that is in contact with the static eliminator, it is possible to effectively prevent charges from being accumulated inside the recording paper. Thereby, it is possible to prevent discharge from occurring through the recording paper, and it becomes possible to reliably transport the recording paper.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conveyance device of a wet electrophotographic apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged explanatory diagram of a static elimination means that constitutes the conveyance device, and FIG. 3 is a configuration diagram of the conveyance device. FIG. 4 is an enlarged explanatory view of the charging means, FIG. 4 is a configuration diagram of a conveying device according to the prior art, and FIG. 5 is an explanatory cross-sectional view of recording paper. ■...Exposure drum 2...Transport belt 3...
・Drive rollers 4a, 4b...Roller 20...
- Conveying device 22...conveying belt 4a. b... Conductive layer 6... Static elimination means 8... Charging means 0... Static elimination brush 2... Charging brush

Claims (1)

[Claims] (1) A conveyance belt that electrostatically attracts and conveys the recording paper after development, a conductive portion provided on the conveyance belt corresponding to a position where an end of the recording paper is disposed, and a conductive portion and A conveying device for an image forming apparatus, comprising: a static eliminating means that contacts the conveying belt; and a charging means that is in contact with the conveying belt and not in contact with the conductive portion.