JPS6295556A - brush charging device - Google Patents

Abstract

PURPOSE:To perform uniform electrostatic charging without any irregularity by providing a buffer layer between a conductive brush and a base. CONSTITUTION:Sponge rubber is lined on an aluminum-made base to form the buffer layer 4 and the conductive brush 1 is adhered and fixed on the top surface of the buffer layer 4 with a conductive adhesive 5. A photosensitive drum 6 is rotated, a voltage is applied to the conductive brush 1, and positive image exposure 13 is carried out to form a latent image; and the latent image is developed positively by a developing machine 7 and the toner image 11 is transferred to recording paper 9 to obtain the recording image. Toner 12 remaining on the photosensitive drum 6 is removed by a cleaner 10. Consequently, the contacting between the conductive brush and recording body is made uniform and stable, so uniform electrostatic charging is carried out.

Description

[Detailed description of the invention] 〔overview〕 The present invention relates to an electrophotographic copying machine and an electrophotographic printer.

In order to prevent uneven charging in charging devices such as electrostatic printers, a loose # layer is provided between the conductive brush and the substrate to ensure uniform and stable contact between the recording medium and the brush. It is something.

[Industrial application field]

The present invention applies to bandwL devices, particularly electrophotographic copying machines.

Grush W1 used for static neutralization and charging of recording bodies (photoreceptors, dielectrics) in electrophotographic printers, electrostatic printers, etc. Regarding equipment.

2. Description of the Related Art With the demand for smaller, simpler, and lower cost copying machines and printers, there has been a need for a charging device that is small and has a simple configuration and is capable of uniform and stable charging.

[Conventional technology]

Conventionally, static electricity removal from recording media such as electrophotographic copying machines and printers,
Corona charging devices are widely used as charging means.

However, the corona charging device requires a high EEE of several fans to generate corona discharge, which increases the cost of the device.

Further, there is a problem in that ozone generated during corona discharge not only has an adverse effect on device components such as a recording medium, but is also harmful to the human body.

In order to solve these problems, a brush charging device as shown in FIG. 5 is used, and a voltage is applied to the conductive brush 1 fixed to the substrate 2 with conductive adhesive 5, and the brush 1 is brought into contact with the surface of the recording medium and charged. A method using contact charging has been attempted.

[Problem that the invention seeks to solve]

With conventional brush band YM and devices, uneven charging tends to occur, and a conductive brush with long bristles is required to ensure stable and reliable contact between the conductive brush and the recording medium and to perform uniform charging. .

However, the bristles of the brush become short due to wear, resulting in incomplete contact between the recording medium and the brush, resulting in uneven charging and distorted images.

Furthermore, brushes with long bristles have the disadvantage that residual toner on the recording medium is easily drawn into the brush, resulting in a short brush life.

[Means for solving problems]

FIG. 1 is a configuration diagram of a brush charging device of the present invention. In the figure, 1 is a conductive brush, 2 is a base, 8 is a voltage application means,
4 is a buffer layer.

[For production]

Since the conductive brush 1 of the present invention is fixed to the base 2 via the flexible buffer layer 4, even if the bristles of the brush are short, the conductive brush 1 can uniformly and stably contact the surface of the recording drum. Can be charged.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a configuration diagram of a brush charging device according to an embodiment of the present invention. In the figure, 1 is a conductive brush made of conductive rayon woven into a pile shape.

The pile was 3M. 2 is a base for supporting the brush and fixing it to the device, and is made of an aluminum plate.

This aluminum base was lined with sponge rubber (hardness 30) to provide a buffer of NM4. The conductive brush 1 was adhered and fixed to the upper surface of the buffer layer 4 using a conductive adhesive 5.

Using this brush charging device, the device configuration shown in Figure 3 is used.
We conducted an experiment. In the figure, 6 is a photoreceptor drum (SeT
e), 7 is a magnetic brush developing machine, 8 is a transfer roller, 9
is recording paper, and 10 is brush cleaner.

11 is a toner image, 12 is residual toner, and 13 is positive exposure.

The photosensitive drum 6 was rotated at a circumferential speed of 100/s, 600 V was applied to the conductive brush 1, and the uniformly charged potential was measured. The average charging potential was 570 V, and the difference between the highest and lowest values was 40 V or less. Ta.

Therefore, positive image exposure 13 was carried out to form a latent image, and a developing machine 7 was used to perform positive development. The developing bias was 100. Thereafter, the toner image 11 was transferred onto the recording paper 9 to obtain a recorded image. The toner 12 remaining on the photosensitive drum 6 was removed by a cleaner 10.

The recorded image thus obtained was clear and free from white spots due to non-uniform charging.

According to this embodiment, uniform charging is possible with low voltage;
Clear images with no white spots can be obtained.

FIG. 4 shows another embodiment of the invention.

The difference from FIG. 2 is that the base is cylindrical, a sponge rubber buffer layer 4 is lined around the cylindrical base 12, and a conductive brush 1 is wrapped around it.

By bringing this into contact with the recording medium while rotating, more uniform charging is possible.

〔Effect of the invention〕

According to the present invention, since the contact between the conductive brush and the recording medium becomes uniform and stable, uniform charging can be performed.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining details of the present invention, and FIG. FIG. 3 is a diagram for explaining the present invention in detail, FIG. 4 is a diagram for explaining another embodiment, and FIG. 5 is a configuration diagram of a conventional example. In the figure, 1 is a conductive brush, 2 and 12 are a substrate, 3 is a voltage application means, and 4 is a buffer layer.

Claims (1)

[Claims] A conductive brush (1) and a base holding the conductive brush (
2) and a means (3) for applying a voltage to the conductive brush, the brush charging device comprising: a buffer layer (4) provided between the conductive brush and the base body.