JPS6147970A - Electrostatic charge device of electronic copying machine - Google Patents

Abstract

PURPOSE:To execute uniform electrostatic charge by weaving a conductive long fiber into a base cloth in the shape of a waveform, forming a brush fur whose tip part is shaped like a loop, and forming a charging brush by winding said fur to a roll core. CONSTITUTION:As for a charging brush 9, a brush fur 9b is formed by weaving a conductive long fiber of about 15-53mum containing carbon into a base cloth 9a in the shape of a waveform so that the electric resistance becomes about 10<2>-10<6>OMEGAcm, and the tip part of each brush fur 9b is shaped like a loop, and also the base part of the brush fur 9b is stuck to the base cloth 9a by means of adhesion, etc. Thereafter, the charging brush 9 is formed by winding the base cloth 9a to the periphery of a roll core 9c.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a charging device for an electronic copying machine that charges the surface of a photoreceptor using a charging brush.

Conventional Technology Most conventional electronic copying machines use a corona charger to charge the photoreceptor, but the Corona charger uses a high-voltage power supply, which is dangerous, and also generates ozone when discharging, causing the copying machine to There is a malfunction that may damage various internal devices. In order to improve this problem, charging devices using charging brushes have recently been adopted.The above charging brushes are made of conductive fibers on the base fabric α, as shown in Figure 84.
27 fibers 6 woven into it, or conductive fibers woven into the base fabric a by electrostatic flocking as shown in Fig. 5.
It is formed by wrapping the flocked hair around a roll core C.

Problems to be Solved by the Invention However, in the conventional charging brush described above, each of the tips of the 127 bristles 6 is independent, so when it comes into contact with the surface of the photoreceptor, sagging occurs and uniform charging is not achieved. This invention was made with the aim of improving the above-mentioned problems. .

Means and Function for Solving the Problems Conductive long fibers are woven into the base fabric in a wavy manner to form a large number of 127 hairs with looped tips, and the base fabric is wound into a roll of 7. A charging device for an electronic copying machine, in which a charging brush is formed by attaching the charging brush to a photoreceptor, and the charging brush is brought into contact with a photoreceptor to charge the surface of the photoreceptor.

Embodiment One embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, numeral 1 represents a photoreceptor of an electronic copying machine.

While being rotated in the direction of the arrow by a drive system (not shown),
Around the photoreceptor 1, there is a charging device 2 that charges the surface of the photoreceptor 10, and an optical system 3s that forms an original image on the surface of the photoreceptor j and develops an electrostatic latent image formed on the surface of the photoreceptor 1. Developing device 41; Transfer device 6 for transferring the toner image formed on the surface of the photoreceptor 1 onto the paper 5; A cleaning device R7 for removing untransferred toner remaining on the surface of the photoreceptor 1 and the like are installed in the above-mentioned order along the rotational direction of the photoreceptor 1.

The charging device R2 is a charging brush 9 to which a DC power source δ is applied.
It's okay.

As shown in FIG. 2, the charging brush 9 has 127 bristles made by weaving conductive long fibers with a thickness of about 15 to 53 μm and containing carbon into a base fabric 9a in a wavy manner so as to have an electrical resistance of 102 to 106 Ω. The tip of each brush bristle qh has a loop shape, and the base of each brush bristle 9b is fixed to the base cloth 9a by adhesive or other means. A charging brush 9 is formed by wrapping the base fabric qa around the roll core 9c (not shown) [300 to 100 volts in the direction opposite to the photoreceptor 1 due to the dynamic system.
While being rotated at a speed of 0 rpm, the tips of the 127 bristles 9b come into contact with the surface of the photoreceptor 10 to charge it.

Effects of the Invention As described in detail above, the present invention has a fabric 1 in which conductive long fibers are woven into the base fabric 9a in a waveform so that the tip end is loop-shaped.
Since the charging brush 9 was formed by forming the 27 bristles qA and winding them around the roll core 9c, when the 127 bristles 9b are brought into contact with the photoconductor 1 to charge the photoconductor 1, the 127 bristles 9b
◇This makes it possible to uniformly charge the photoconductor 1, and even after long periods of use, each
Because hair 9b is continuous.

There is no risk of hair removal adversely affecting image quality.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a copying machine showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of a charging brush, Fig. 3 is an enlarged view of 127 bristles, Fig. 4 and the fifth factor are conventional explanations. It is a diagram. I is a photoreceptor, 9 is a charging brush%, 9a is a base fabric, 9b is a brush bristles, and 9c is a roll core.

Claims (1)

[Claims] In the device in which the surface of the photoreceptor 1 is charged by a charging brush 9, the charging brush 9 is made by weaving conductive long fibers into a base cloth 9a in a wavy manner to form a large number of brush bristles 9b having loop-shaped tips. A charging device for an electronic copying machine is formed by winding the base cloth 9a around a roll core 9c.