JPH04258984A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE:To form an image of high quality with respect to the electro photographic recorder. CONSTITUTION:A latent image formed on an image carrier is developed by a developing device and made into a toner image. In the electrophotographic recorder transferring the toner image to paper at a transfer device, an elimination means eliminating fogging toner stuck on a non image part of an image carrier is provided in the middle of the developing device and the transfer device. The elimination means is a rotatable fur brush provided with a fur tip in sliding contact with the image carrier surface at a specified density and pressure. The specified density and pressure is constituted to be such eliminating fogging toner stuck on the non image part without causing turbulence to the toner image stuck on an electrostatic latent image.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an electrophotographic recording device.

0002

2. Description of the Related Art As shown in the schematic diagram of FIG. 2, an electrophotographic recording apparatus to which the present invention is applied uses an image bearing member such as a photosensitive drum ( (hereinafter referred to as a photosensitive drum) 1, a developing device 2 that attaches polyester toner to the drum surface using a potential difference with the surface of the photosensitive drum 1, a charger 3 that uniformly charges the surface of the photosensitive drum 1, and a laser beam. The optical system 4 forms an electrostatic latent image by changing the amount of charge on the photosensitive drum 1 depending on the scanning of the photosensitive drum 1, and a transfer device 6 that transfers the toner image on the photosensitive drum 1 onto a sheet of paper 5.

In the figure, reference numeral 7 denotes a cleaning device for removing and collecting toner remaining on the surface of the photosensitive drum 1;
is a static eliminator for the photosensitive drum 1.

0004

As shown in the enlarged side view of the main part of FIG. 3, toner 9 is charged by the developing device 2 and attached to the electrostatic latent image 1a of the photosensitive drum 1 to form a toner image 10. do.

[0005] In order to obtain a high-resolution image, the electrostatic latent image 1a
Ideally, the toner should be developed to form a visible image. However, the toner 9 contains materials with a low charge amount or materials that are charged to the opposite potential, and it is difficult to remove them, so that the so-called non-image area 1b other than the electrostatic latent image is mixed with the toner 9. The fog toner 9a is attached as shown in the figure.
There have been problems in that fog printing and image contour disturbances occur, which hinders improvement in resolution.

The present invention is directed to the formation of high quality images.

[0007]

[Means for solving the problem] In the present invention, FIG.
As shown in the enlarged side view of main parts, a removing means 11 is provided between the developing device 2 and the transfer device 6 for removing fog toner 9a attached to the non-image area of the image bearing member (photosensitive drum) 1. The removing means 11 is a rotatable FurBrush 12 whose bristles are brought into sliding contact with the surface of the photosensitive drum 1 at a predetermined density and pressure. This removes the fog toner 9a attached to the non-image area without disturbing the toner image attached to the electrostatic latent image.

[0008]

[Operation] After development, the fog toner is removed by a fur brush and the toner image is transferred to paper.

[0009]

[Embodiment] In the present invention, as shown in the enlarged side view of main parts in FIG. The removing means 11 is a rotatable fur brush whose bristles are brought into sliding contact with the surface of the photosensitive drum 1 at a predetermined density and pressure.
sh) 12.

The predetermined density and pressure of the bristles of the fur brush 12 are set so as to remove only the fog toner 9a attached to the non-image area without disturbing the toner image attached to the electrostatic latent image.

The material of the fur brush 12, the density and hardness of the bristles, etc. are determined experimentally depending on the compatibility with the toner used and the photosensitive drum. Further, the material of the fur brush 12 may be a conductive material to apply an electric field to increase the electrical attraction force.

The removed fog toner is recovered by a recovery device (not shown). After developing in this way,
The fog toner is removed from the surface of the photosensitive drum 1, and the toner image in the form of the electrostatic latent image 1a is transferred to the paper 5 with high quality.

[0013]

According to the present invention, fog toner is removed from the non-image surface of an image bearing member such as a photosensitive drum, and a toner image in accordance with an electrostatic latent image is transferred to paper. The resolution is 1
The number of dots per inch is 4,000 or more, and even adjacent one-dot lines can be resolved, which has a great effect on improving image quality.

[Brief explanation of the drawing]

FIG. 1: An enlarged side view of main parts of an electrophotographic recording device of the present invention;

FIG. 2 is a schematic diagram of an electrophotographic recording device to which the present invention is applied;

[Figure 3] Enlarged side view of the main parts of Figure 2,

[Explanation of symbols]

1 Image carrier (photosensitive drum), 2. Developing device, 5 Paper, 6　Transfer device, 9 Toner, 9a fog toner, 11. Removal means, 12 Fur brush,

Claims (3)

[Claims] Claim 1: An electronic device that develops an electrostatic latent image formed on an image carrier (1) into a toner image with a developing device (2), and transfers the toner image onto a sheet of paper (5) with a transfer device (6). In the photographic recording device, the developing device (2) and the transferring device (6) are provided.
2.) An electrophotographic recording apparatus characterized in that a removing means (11) for removing fog toner (9a) adhering to the non-image area of the image carrier (1) is provided between the image carrier (1). 2. The removing means (11) according to claim 1 is a rotatable fur brush (12) whose bristles are brought into sliding contact with the surface of the image carrier (1) at a predetermined density and pressure. An electronic photographic recording device characterized by: 3. The predetermined density and pressure according to claim 2 are characterized in that the fog toner (9a) attached to the non-image area is removed without disturbing the toner image attached to the electrostatic latent image. An electrophotographic recording device.