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Electrode for image forming apparatus and image forming apparatus

a technology of image forming apparatus and electrode, which is applied in the direction of coupling device connection, corona discharge, instruments, etc., can solve the problem of contact failure being more likely to be caused, and achieve the effect of suppressing adjacent portions of the wir

Active Publication Date: 2015-03-31
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]Further, if two portions of the wire intersect with each other, as compared to a state where two portions of the wire are aligned in parallel in a close contact state, a contact area between the electrical contact portion and a member which contacts with the electrical contact portion is reduced, and therefore, a contact failure is more likely to be caused.
[0010]Accordingly, in the present invention, even if an external force acts on the ring portion (31B) such that adjacent portions of the wire of the ring portion deviate from each other in a direction perpendicular to the center line, the inner portion (31E) or the outer portion (31F) is locked to the adjacent portions of the wire (31C). Therefore, it is possible to suppress adjacent portions of the wire from being twisted and shifting to intersect with each other.
[0011]Therefore, even if an external force acts on the electrical contact portion, that is, the ring portion (31B), it is possible to obtain an electrode capable of suppressing adjacent portions of the wire (31C) from shifting to be twisted.

Problems solved by technology

Further, if two portions of the wire intersect with each other, as compared to a state where two portions of the wire are aligned in parallel in a close contact state, a contact area between the electrical contact portion and a member which contacts with the electrical contact portion is reduced, and therefore, a contact failure is more likely to be caused.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first exemplary embodiment

1. Brief Description of Image Forming Apparatus

[0024]Inside a housing 3 of an image forming apparatus 1, as shown in FIG. 1, an image forming unit 5 is stored for transferring developer images onto a sheet such as a recording paper sheet, thereby forming an image on the sheet. The image forming unit 5 includes process units 7, an exposing unit 9, a fixing unit 11, and so on.

[0025]The image forming unit 5 according to the present exemplary embodiment is a direct tandem type image forming means including a plurality of (four in the present exemplary embodiment) process units 7 disposed in series along a sheet conveyance direction.

[0026]The individual process units 7 are different only in the colors of developer stored therein, and are substantially the same in their structures and so on. Specifically, each process unit 7 includes a photosensitive drum 7A for carrying a developer image thereon, a charging unit 7B for charging the photosensitive drum 7A, and so on.

[0027]At positions fac...

second exemplary embodiment

[0055]In the above-mentioned exemplary embodiment, the straight portion 31D is provided only to the portion connecting the spring portion 31A and the ring portion 31B. However, in the present exemplary embodiment, as shown in FIG. 8 (8A, 8B), a straight portion 31D is also provided to the terminal end side of the ring portion 31B. In other words, in the present exemplary embodiment, straight portions 31D are provided to the terminal end side and start end side of the ring portion 31B.

third exemplary embodiment

[0056]In the above-mentioned exemplary embodiments, the inner portion 31E and the outer portion 31F are connected to each other in a straight shape. However, the present exemplary embodiment shows an example in which each of the inner portion 31E and the outer portion 31F is curved as shown in FIG. 9.

[0057]Further, as shown in FIG. 9, each of the inner portion 31E and the outer portion 31F is bent in an L shape. However, the present exemplary embodiment is not limited thereto. For example, each of the inner portion 31E and the outer portion 31F may be curved in an arc shape.

[0058]It is to be noted that, also in the present exemplary embodiment, the portion connecting the inner portion 31E and the outer portion 31F is straight and intersects with the ring portion 31B in a contact state, and the inner portion 31E and the outer portion 31F deviate with respect to the ring portion 31B in the direction L3 perpendicular to the center line L2.

Other Exemplary Embodiments

[0059]In the above-d...

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PUM

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Abstract

An electrode for an image forming apparatus, the electrode including: an elastically deformable spring portion that is formed in a cylindrical shape by spirally winding a wire; a ring portion that is an electrical contact portion having an annular shape and provided to one end side of the spring portion in an axial direction of the spring portion, the ring portion being formed by winding the wire around a center line, which intersects with the axial direction of the spring portion, at least twice; an inner portion that is formed by the wire forming the ring portion and is positioned at an inside of the ring portion; and an outer portion that is formed by the wire forming the ring portion and is positioned at an outside of the ring portion.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from Japanese Patent Application No. 2012-011277 filed on Jan. 23, 2012, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]One or more aspects of the present invention relates to an electrode for an image forming apparatus, and an image forming apparatus using the electrode.BACKGROUND[0003]As an example, an electrode for an image forming apparatus disclosed in JP-A-2011-64925 includes a spring portion formed by winding a wire in a coiled shape (a spiral shape), and an electrical contact portion formed by winding the wire in an annular shape.[0004]The above-mentioned electrical contact portion is formed by winding the wire twice such that adjacent positions of the wire are in close contact. For this reason, if the electrical contact portion having the annular shape is seen from a direction perpendicular to the center line of the electrical contact portion, two portions o...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G15/00G03G15/02G03G21/16G03G21/18
CPCG03G15/0266G03G21/1652G03G21/1867
Inventor SOUDA, MAKOTO
Owner BROTHER KOGYO KK