JP3043472B2 - Static eliminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic device, for example,
The present invention relates to a static eliminator for removing residual charges on a surface of a photoconductor and charging the charges in an electrostatic recording apparatus, an electrophotographic copying apparatus, and the like.

[0002]

2. Description of the Related Art As a conventional charge removing device, for example, there is one as shown in FIG. The charge removing device 1 shown in FIG. 3 is applied to the electrostatic recording device 2, and includes a charging charger 3 for charging a charge and a charge removing lamp 4 for removing a residual charge.
Are separately attached to the apparatus main body 2A. The charging charger 3 is provided with a casing 7 having a U-shaped cross section provided in the vicinity of the photoreceptor belt 6 stretched over three rolls 5 so that an opening is provided on the photoreceptor belt 6 side.
A charging wire 8 extending in the center of the casing 7 in parallel with the photoreceptor belt 6 and perpendicular to the moving direction of the photoreceptor belt 6, and a mesh-shaped support supported by an opening 7a of the casing 7. A grid 9 and a frame-shaped holding member 10 that holds the casing 7 and is attached to the manufacturing main body 2A are provided separately. The grid 9 is electrically connected to a varistor unit 11 by a connection cable 12. The grid 9 of the charger 3 is the photosensitive belt 6
So that it is at a predetermined distance from the surface 6a of the casing 7
The side end 7a of the photoreceptor belt 6 is pressed toward the photoreceptor belt 6 by a spring 14, and is positioned by pressing against a positioning reference member 13 fixed to the mounting main body 2A.

Further, the charge removing lamp 4 is separately attached to the mounting body 2A by the holding member 15 so as to be located on the upstream side in the moving direction of the photosensitive belt 6 with respect to the charging charger 3,
As in the case of the charging charger 3, the case 4A of the discharging lamp 4 is attached to the positioning member by a spring or the like so that the distance between the opening side of the discharging portion 16 of the discharging lamp 4 and the surface 6a of the photoreceptor belt 6 becomes a predetermined distance. It is positioned by pressing against the photoreceptor belt 6 side.

[0004]

However, in such a conventional static eliminator, the holding member 10 and the connection cable 12 are separate from the grid 9, and the holding member 10 and the connection cable 12 are not provided. It was managed as a single part. Further, a spring for pressing the casing 7 or the case 4A toward the photoreceptor belt 6 is required, so that the number of parts is increased, the management is troublesome, and the assembling work is troublesome.

The present invention has been made in view of such a conventional problem, and a part of the grid of the charging charger is extended and used as a holding portion. The holding portion is formed of a spring member. By extending a part of the grid and using it as an electrical connection, the grid, the holding part,
The connecting part and the positioning part are integrally formed, the number of parts can be reduced, the parts can be easily assembled, the positioning can be easily performed, the cost can be reduced, and the operation reliability can be improved. An object of the present invention is to provide a charge removing device.

[0006]

According to a first aspect of the present invention, an electric charge is charged on a latent image carrier which is disposed close to a latent image carrier and is attached to the housing while holding a casing for supporting a grid. A charging member for removing the residual charge on the latent image carrier attached to the housing while holding the charge removing unit, wherein the grid extends a part of the grid to extend the casing. A second aspect of the present invention is the static eliminator according to the first aspect, wherein the holding section of the grid is formed of a spring member. The charge removing device according to claim 1 or 2, wherein the grid has a positioning portion on a side of the grid on the latent image carrier, and claim 4 is the charge removing device according to claim 1, 2, or 3, The grid is The charge removing device according to any one of claims 1, 2, 3, and 4, further comprising a connecting portion that extends a part of the grid and electrically connects the grid and the varistor. 6. The charge removing device according to claim 1, 2, 3, 4, or 5, wherein the holding unit includes a charge removing holding portion that holds the charge removing unit. A positioning portion on the side of the latent image carrier.

[0007]

According to the first aspect of the present invention, since the grid has the holding portion which extends a part of the grid, the holding portion and the grid are formed integrally. In the second aspect, since the holding portion of the grid is a spring member, the casing supporting the grid is urged toward the latent image carrier by the spring member of the holding portion.

In the third aspect, since the grid has the positioning portion, the relative position between the grid and the latent image carrier is directly determined by the positioning portion of the grid. According to the fourth aspect, since the grid has a connection portion extending a part of the grid, the grid and the varistor are directly electrically connected by the connection portion. According to the fifth aspect, since the holding portion of the grid has the charge elimination holding portion, the charge elimination portion is held by the charge elimination holding portion of the holding portion of the grid.

According to the sixth aspect, since the charge eliminating section has the positioning section, the position of the charge eliminating section is directly determined by the positioning section of the charge eliminating section.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are views showing an embodiment of a charge removing device according to claims 1 to 6 of the present invention, and are views showing main parts applied to a copying machine. First, the configuration will be described. In FIG. 1, reference numeral 21 denotes a charge removing device, and the charge removing device 21 is disposed near a photoreceptor belt 24 which is a latent image carrier wound around three rolls 23 in a copying machine 20. . Roll 23A is a drive roll. Reference numeral 25 denotes a charging charger which is a charging body, and the charging charger 25 is a long, U-shaped cross section and an opening 26a.
A casing 26 having an opening 26 of the casing 26.
a is located close to the photoreceptor belt 24 with a being the photoreceptor belt 24 side. At the center of the cross section of the casing 26, a charger wire 27 is stretched in a direction parallel to the surface 24a of the photoreceptor belt 24 and perpendicular to the moving direction of the photoreceptor belt 24.

The opening 26a of the casing 26 is made of a stainless steel plate member and has a mesh grid having a large number of pores.
31 are provided. The grid 31 extends partly through the top plate 26b of the casing 26 opposite to the opening 26a of the casing 26, and extends along the outer surface of the top plate 26b. And a holding portion 31a for holding the casing 26. Holder 31a
Is composed of a spring member 31c, which is bent in a V-shape to form a terminal portion 31.
b is attached to the apparatus body 20A as a housing, and the casing 26 is urged toward the photoreceptor belt 24 and fixed.

The grid 31 is a photosensitive belt 24 of the grid 31.
The main body 20 has a projection 31d which is a protruding positioning portion on the side thereof, and is biased by a holding portion 31a which is a spring member 31c.
The grid contacts the positioning reference member 34 fixed to A
The position of 31 is determined, and the distance between the photoreceptor belt 24 and the grid 31 at the opening 26a of the casing 26 can be set to a predetermined value.

A varistor 35 is attached to the main body 20A of the apparatus via a terminal portion 31b of a holding portion 31a. The grid 31 extends a part of the grid 31 and has a connecting portion 31e for electrically connecting the grid 31 and the varistor 35. In this embodiment, the connecting portion 31e is provided also as the holding portion 31a. Reference numeral 36 denotes a static elimination lamp, which is a static elimination unit. The static elimination lamp 36 is disposed on the upstream side in the moving direction of the photosensitive belt 24 with respect to the charging charger 25, and removes residual charges on the charging charger 25. The holding portion 31a of the grid 31 is
A static elimination holding portion 31f for holding the static elimination lamp 36 upstream of the fixed portion of the top plate 26b in the moving direction of the photosensitive belt 24.

The static elimination lamp 36 is provided with a projection 37 as a positioning portion for positioning on the photosensitive belt 24 side of the static elimination lamp 36, and the projection 37 determines the relative position between the photosensitive belt 24 and the static elimination lamp 36. Has been made possible. Next, the operation will be described. In the present invention, a part of the grid 31 is extended, and a part thereof is fixed to the casing 26,
Since the casing 26 is held and attached to the apparatus main body 20A, the conventional separate grid 9 and the holding member 10 are provided.
Are integrally formed, the number of parts is reduced, the number of parts management and assembling steps is reduced, and the cost can be reduced.

A projection 31d as a positioning portion is formed on the photoreceptor belt 24 side of the grid 31, and a holding portion 31a is formed of a plate-like spring member 31c, and urges the casing 26 toward the photoreceptor belt 24 side. Therefore, as shown in FIG. 1, the positioning of the grid 31 does not require a spring for urging the holding member toward the photoreceptor belt 24 as in the related art, and the protrusion 31 d
By merely contacting the positioning reference member 34 with the biasing force of the holding portion 31a, the position of the grid 31 with respect to the photoreceptor belt 24 is determined, the number of parts is reduced, and the cost can be reduced.

Further, the holding portion 31a is composed of the grid 31 and the varistor.
Since it also serves as the connecting portion 31e for electrically connecting the 35 and
It is not necessary to attach a separate connection cable and manage parts as in the conventional case. The terminal portion 31b of the holding portion 31a is fixed to the apparatus main body 20A, and the varistor 35 is mounted on the terminal portion 31b via the terminal portion 31b. 31 and the varistor 35 are electrically connected. For this reason, the mounting operation can be simplified, the number of components is reduced, component management is unnecessary, connection reliability is increased, and costs can be reduced.

Further, since the holding portion 31a of the grid 31 holds the static elimination lamp 36 in the static elimination holding portion 31f, a separate holding member dedicated to the static elimination lamp 36 is unnecessary, the number of parts is reduced, and the assembly is simple. Can reduce costs. Also, a protrusion as a positioning portion is provided on the photosensitive belt 24 side of the static elimination lamp 36.
As shown in FIG. 2, the projection 37 is urged toward the photoreceptor belt 24 by the holding portion 31a of the spring member, and comes into contact with the positioning reference member 40, as shown in FIG. The relative position with the body belt 24 can be determined,
Positioning can be done quickly and easily.

[0018]

As described above, according to the first aspect of the present invention,
According to the invention, a part of the grid of the charging charger is extended and used as a holding part. According to the second aspect, the holding part is a spring member. Further, according to the third aspect, the positioning is performed on a part of the grid. According to the fourth aspect of the present invention, the grid, the holding part, the connection part, and the positioning part are integrally formed by extending a part of the grid and using it as an electrical connection part, The number of parts can be reduced, parts can be easily assembled, positioning can be done easily, and
Cost can be reduced, and operation reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view, partially in section, showing an embodiment of a charge removing device according to claims 1 to 6 of the present invention.

FIG. 2 is a partially sectional schematic front view showing a part of the operation of the charge removing device shown in FIG.

FIG. 3 is a partial cross-sectional schematic front view showing a conventional charge removing device.

[Explanation of symbols]

 20A Apparatus main body (housing) 21 Elimination device 24 Photoreceptor belt (latent image carrier) 25 Charging charger (Charging body) 26 Casing 31 Grid 31a Holding section 31b Terminal section 31c Spring member 31d Projection (positioning section) 31e Connection section 31f Static elimination holding part 36 Static elimination lamp (static elimination part) 37 Projection (positioning part)

Claims (6)

(57) [Claims] A charging member which is disposed close to the latent image carrier and holds the casing supporting the grid, is attached to the housing and charges the latent image carrier with electric charges; And a static eliminator attached to the latent image carrier for removing residual charges on the latent image carrier, wherein the grid includes a holding portion that extends a part of the grid and holds a casing. To remove static electricity. 2. The charge removing device according to claim 1, wherein the holding portion of the grid comprises a spring member. 3. The charging device according to claim 1, wherein the grid has a positioning portion on a side of the grid on the latent image carrier. 4. The static eliminator according to claim 1, wherein the grid has a connecting portion extending a part of the grid and electrically connecting the grid to a varistor. 5. The charge holding section for holding the charge removing section, wherein the holding section of the grid has a charge removing holding section for holding the charge removing section.
5. The charge removing device according to 2, 3, or 4. 6. The static eliminator has a positioning portion on the latent image carrier side of the static eliminator.
6. The static eliminator according to 3, 4 or 5.