JPH05303261A - Grid tension structure of scorotron charger - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a grid of a scorotron charging device having a structure in which the tension of the grid can be easily adjusted, and thereby a desired tension can be easily set. To get a tension structure. According to the present invention, there is provided a grid tension structure for a scorotron charging device, wherein an engagement end portion 1A having an engagement portion engageable with an end portion in the longitudinal direction of a grid 2 and an engagement portion in the longitudinal direction are provided. Anchor member 1 including a claw portion 1B1 formed of a bent piece formed at an end portion 1B on the opposite side of the joint end portion, and a pair of ends for mounting and supporting the longitudinal end portions of the grid 2 thereon. Tension including a plurality of locking portions 3A formed in parallel with the longitudinal direction of the grid so that the end blocks of the block 3 facing the anchor member 1 can be engaged with the claw portions of the anchor member 1. It is characterized by having an adjustment structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid tension structure for a scorotron charging device.

[0002]

2. Description of the Related Art In a device used in a charging process in an electrophotographic system, for example, in the case of a scorotron charging device, a grid is arranged between a discharge wire and a photosensitive member (for example, the actual development). 62-181954). The above-mentioned grid is designed to be extended in the longitudinal direction by, for example, the structure shown in FIG. 5 in order to keep the distance between the grid and the photosensitive member constant. That is, in FIG. 5, end blocks A1 and A2 for supporting both ends of a grid B disposed between both ends of the housing A of the charging device in the longitudinal direction are located. Part of both ends in the longitudinal direction of B is placed. One end A of the end block in the longitudinal direction of the grid B and the end block A
Both ends of a spring C are hooked between the spring 1 and the spring 1, and a tension for extending the grid B in the longitudinal direction is added by the spring C.

[0003]

However, in such a grid tension structure, the spring C is attached to the latching portion of the end block A1 or the grid B.
In order to lock the end of the spring C, a small ring portion formed at the end of the spring C needs to be aligned with the hooking portion, and the attachment work has not been easy. Further, even if the end portion of the spring is hooked on the hooking portion, the desired tension cannot be obtained, and the operation such as replacement of the spring is required again, which makes the grid mounting and assembling troublesome.

Therefore, in view of the above-mentioned problem in the grid tension structure of the scorotron charging device, an object of the present invention is to easily adjust the grid tension, whereby a desired tension can be easily set. To obtain the grid tension structure of the scorotron charging device.

[0005]

In order to achieve this object, the present invention is a grid tension structure for a scorotron charging device, in which an engageable engaging portion is formed at the longitudinal end of the grid. An anchor member having a joint end portion and a claw portion formed of a bent piece formed at an end portion opposite to the engaging end portion in the longitudinal direction, and both longitudinal ends of the grid are placed. It is characterized in that it is provided with a tension adjusting structure which is formed on the end block side which is supported by and which is supported by a plurality of locking portions which can be engaged with the claw portions of the anchor member.

The invention according to claim 2 is characterized in that the engaging portion is formed in a sawtooth shape.

Further, in the invention as set forth in claim 3, the anchor member is divided into an end portion engaging with the longitudinal end portion of the grid and an end portion on the side where the claw portion is formed, and the divided end portion. It is characterized in that the parts are rotatably connected by a support shaft in a direction orthogonal to the grid surface.

[0008]

According to the first aspect of the present invention, the tension with respect to the grid can be changed by changing the position of the claw portion of the anchor member and the position of the engaging portion on the end block side. According to the second aspect of the invention, the claw portion can be hooked and fixed.

Further, according to the third aspect of the present invention, the claw portion side end portion of the anchor member and the engagement end portion engaged with the grid side are divided, and the divided portions are rotatably connected to each other. Therefore, with respect to the hook on the side engaged with the grid, the close contact state between the engaging portion and the claw portion formed on the end block side can be obtained, and the engaging force from the engaging portion can be increased. Works equally.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a main part of a grid tension structure of the present invention, and this structure includes an anchor member 1. The anchor member 1 includes an end portion 1A facing the end portion in the longitudinal direction of the grid 2 and the end portion 1A.
And an end portion 1B facing the end block 3 of the scorotron charger on the opposite side. At the end 1A, the hook 1A1 is provided in parallel along the direction perpendicular to the longitudinal direction of the scorotron charger and is folded back toward the grid 2.
Is provided, and this hook 1A1 is fitted in an engagement hole 2A formed in the grid 2. Also,
A claw portion 1B1 formed of a bent piece facing the end block 3 is formed on the end portion 1B.

On the other hand, the end block 3 is located at an end portion in the longitudinal direction of the scorotron charger, a locking portion 3A is provided at a position on the upper surface thereof facing the claw portion 1B1 of the anchor member 1, and a grid 2 is provided. Mounting portions 3 </ b> B are formed at the end portions located on the center side in the longitudinal direction. The locking portion 3A is a portion for hooking and locking the anchor member 1, and as shown in FIG. 2, a plurality of locking portions are arranged along the longitudinal direction of the grid 2 and have a serrated cross section. The mounting portion 3B serves as a guide portion for moving the anchor member 1 along the longitudinal direction of the grid 2 and is a portion for setting the facing interval of the grid 2 with respect to the photoconductor (not shown). A protrusion 3B1 having a substantially elliptical shape in a plan view is provided at the center of the anchor member 1 and is fitted in a long hole having a long axis parallel to the grid longitudinal direction.

Since the present embodiment is constructed as described above,
Hook 1A of the anchor member 1 to the end of the grid 2
1 is engaged with the engagement hole 2A located at the end of the grid 2, and the claw 1B1 is engaged with the engaging portion 3 of the end block 3.
The end portion of the grid 2 is fixed to the end block 3 by being hooked on A. On the other hand, when adjusting the tension of the grid 2, for example, once disengage the claw portion 1A1 of the anchor member 1 from the locking portion 3A of the end block 3,
Hang it on the locking portion 3A at the position where the desired tension is applied. The grid 2 at this time is formed by the guide projections 3B1 located on the mounting portion 3B of the end block 3.
Can be moved in a state parallel to the longitudinal direction of the.

On the other hand, FIGS. 3 and 4 show another embodiment of the present invention, which is characterized in that the anchor member is divided. 2 and subsequent drawings, the same components as those shown in FIG. 1 are designated by the same reference numerals. That is, the anchor member 1
0 faces the longitudinal end portion of the grid 2 and faces the end portion 10A on the side having the pair of hooks 10A1 and the locking portion 3A of the end block 3 as in the embodiment shown in FIG.
The end portion 10B on the side having the claw portion 10B1 having the same structure as that of the above-described embodiment is divided, and these end portions are
It is rotatably connected by a pin 11. Since the present embodiment has the above-described configuration, when fixing the end portion of the grid 2 to the end block 3, the same procedure as that of the embodiment shown in FIG. 1 is performed. On the other hand, when adjusting the tension of the grid 2, the same procedure as in the embodiment shown in FIG. 1 is performed. At this time, the end portions 10A and 10
Since both B are rotatably connected, the locking portion 3A
Since the claw portions 10A1 can be brought into close contact with each other depending on the orientation of the hooks, the locking force F1 due to these two feelings is evenly applied to the hook 10B1 engaged with the grid 2 side.
Can act as.

[0014]

As described above, according to the present invention, in the structure for fixing the end portion of the grid to the end block, the anchor member having the end portion engaged with the end portion of the grid is provided, and this anchor member is provided. Since the formed claws are hooked to the locking part of the end block and locked, and multiple locking parts are formed along the longitudinal direction of the grid, when adjusting the grid tension, the locking is performed. It suffices to change the engagement position between the portion and the claw portion, and it is possible to adjust the tension of the grid for giving a desired tension by a simple operation. Further, according to the present invention, the end portion having the claw portion hooked to the end block side of the anchor member and the end portion engaged with the grid side are divided, and the end portion on the grid side is perpendicular to the longitudinal direction. Since the hooks arranged side by side are provided and the both end portions are rotatably connected to each other, the end portion on the side hooked to the locking portion can be closely attached depending on the direction of the locking portion. .. Therefore, the locking force generated at the end portion on the side hooked by the locking portion can be uniformly applied to both hooks.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a grid tension structure of a scorotron charging device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view in the direction indicated by-in FIG.

FIG. 3 is a plan view showing a main part of a grid tension structure of a scorotron charging device according to another embodiment of the present invention.

FIG. 4 is a plan view showing an anchor member taken out of the main part shown in FIG.

FIG. 5 is a perspective view showing a conventional example of a grid tension structure of a scorotron charging device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Anchor member 1A End of the anchor member on the side facing the grid 1A1 Hook 1B End of the anchor member on the side facing the end block 1B1 Claw 2 Grid 2A Engagement on the end of the anchor member facing the grid Hole 3 End block 3A Locking part 3B Mounting part

Claims (3)

[Claims] 1. A grid tension structure for a scorotron charging device, comprising: an engaging end portion having an engageable engaging portion formed at an end portion in the longitudinal direction of the grid; and the engaging end portion in the longitudinal direction. An anchor member having a claw portion formed of a bent piece formed at an end portion on the opposite side, and the anchor member among a pair of end blocks for mounting and supporting the longitudinal end portion of the grid. Engageable with the claws of the anchor member on the opposing end blocks,
A grid tension structure for a scorotron charging device, further comprising a tension adjusting structure including a plurality of locking portions formed in parallel with a grid longitudinal direction. 2. The grid tension structure for a scorotron charging device according to claim 1, wherein the engaging portion formed on the end block is formed in a sawtooth shape. 3. The grid tension structure for a scorotron charging device according to claim 1, wherein the anchor member has an engaging end portion that engages with a longitudinal end portion of the grid and an end portion on the side where the claw portion is formed. The grid tension structure of the scotroton charging device in which the divided ends are rotatably connected by a support shaft in a direction orthogonal to the grid surface.