JPS61105566A - Brush triboelectrifier - Google Patents

Abstract

PURPOSE:To keep stable triboelectrification by providing a supporting plate adjacently to contacts consisting of flexible electric resistance bodies. CONSTITUTION:Contacts 11 are blocked on a fabric 16 consisting of a base fabric 14 and a conductive backcoat layer 15, and this fabric 16 is stuck to a base 10 consisting of aluminium or the like, and a supporting plate 17 is provided in one end side of the fabric 16 so that it is brought into contact with contacts, and this supporting plate 17 is slightly shorten than contacts 11 and is not brought into contact with a surface 13a of a body 13 to be electrified. An electrode 12 for brush electrification is arranged to face the body 13 to be electrified so that the supporting plate 17 is placed below in the moving direction of the body 13 to be electrified, and a voltage is applied to contacts 11. Thus, the fall of contacts 11 is prevented by the supporting plate 17, and dust in an electrophotographic copying machine is attracted to contacts by the electric field around contacts 11, and as the result, stable electrification is kept because the surface 13a of the body 13 to be triboelectrified is not dirtied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plan charging device for charging a photoreceptor of an electrophotographic copying machine and for use in other processes.

The details are related to plan-type charging electrodes.Q Conventional technologyA corona charger is known as a device for charging the photoreceptor of an electrophotographic copying machine, but corona chargers are dangerous because they use high voltage. At the same time, ozone is generated, which damages peripheral equipment. Therefore, a plan charging device using a plan type charging electrode, which is a contact charging method, has been developed.

The plan type charging electrode has a large number of contacts embedded in the base, and the contacts include peeled fibers,
Metal wires, etc. are used, but in order to rub the surface of the charged object, it is considered that flexible conductive fibers 1, such as Kanebo's Beltron, Toshisha's 5A-7, etc., are used as contacts. has been done.

In other words, if the contact is flexible, damage to the surface of the charged object is reduced.

Problems to be Solved by the Invention As shown in FIG. 3, a bar-shaped plan-type charging device in which a contactor 2 is embedded in a bar-shaped base 1 is arranged with the pole 3 facing the object to be charged 4. In a bar-type plan charging device in which a contactor 2 is placed in contact with the light surface 4α and a voltage is applied to the contactor 2, if the contactor 2 is made flexible, the direction of the outlet of the charged object 4.

The contactor 2 falls down in the moving direction of the charged object, and the electric field of the rotation of the contactor 2 attracts dust inside the electrophotographic copying machine to the contactor 2, which in turn causes the charged object 4 to fall down.
Since the surface 4α of is contaminated, charging performance deteriorates and stable charging cannot be maintained.

Means for solving the problem: A support plate is provided adjacent to the active contact, and the support plate prevents the contact from falling down due to the movement of the charged object, and also prevents the surface of the charged object from becoming dirty. thing.

Embodiment FIG. 1 is a front view of a bar-type plan charging device, and a base 10 having a long bar shape with a substantially U-shaped cross section has a contactor 11.
A large number of bar-shaped plan-type charging electrodes 12 are implanted, and a voltage is applied to the contacts 11 thereof, and they are in contact with the surface +3a of the N'4 body 13.

The contactor 11 is embedded in a fabric 16 made of a base fabric 14 and a conductive back coat layer 15, and the fabric 16 is attached to a base 10 made of aluminum or the like, and one end of the fabric 16 is attached to the fabric 16. A support plate 17 is provided so as to be in contact with the contact 11, and this support plate 17 is slightly shorter than the contact 11 so as not to come into contact with the surface 13α of the covered body 13.

As the support plate 17, a thermoplastic resin film such as a polyethylene film having a thickness of 100 to 500 μm is used, and is thermally fused to the base fabric 14 by applying a heat source from the back side of the back coat layer 15.

Then, the plan type charging electrode 12 is attached to the charged object 13 so that the support plate I7 is located on the downstream side in the moving direction of the charged object 13.
A voltage is applied to the contactor 11.

Because of this, the support plate 17 prevents the contact 11 from falling down, and the electric field of the rotation of the contact II attracts dust inside the electrophotographic copying machine to the contact 11, which in turn causes the plate band T to pass. Since the surface 13α of the body 13 is not contaminated, stable charging can be maintained.

Note that if the support plate 17t is also provided on the other end side of the base fabric 14, on the upstream side in the moving direction of the charged object, the above-mentioned effect will be more pronounced.

Further, although the implantation width A of the contactor 11 has conventionally increased by about 10 inches, the implantation width A did not increase when the above-mentioned structure was adopted.

Advantages of the Invention The support plate 17 prevents the contact 11 from falling down, and also prevents the surface 13α of the charged object 13 from being contaminated, thereby maintaining stable charging.

[Brief explanation of the drawing]

1 and 2 show embodiments of the present invention, FIG. 1 is a front view of a bar-shaped plan charging device, FIG. 2 is a partially enlarged view of a bar-shaped plan charging electrode, and FIG. The figure is a front view of a conventional device. 10 is a base, 11 is a contact, and 13 is an object to be charged. 13α is the surface.

Claims (2)

[Claims] (1) A plan charging device characterized in that a support plate 17 is provided adjacent to a contactor 11 made of a flexible electrical resistor. (2) The plan charging device according to claim 1, wherein the support plate 17 is made of a thermoplastic resin film and is thermally fused to the base fabric 14.