JPS6226758Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a corona discharge device used in a charging device, a transfer device, or a cleaning device in an electrostatographic copying machine.

A corona discharge device in which the charging width of a fine wire for corona discharge can be adjusted is disclosed in, for example, Japanese Utility Model Application Publication No. 130348/1983.

In this case, a long hole is formed in the shielding cover for adjusting the electrification width of the thin wire for corona discharge, and the shielding cover is attached to the longitudinal end of the discharge opening of the shield case, which has the thin wire for corona discharge inside. Although the shielding cover is fixed to the shielding section with a screw inserted through the elongated hole so that its position can be changed, a tool is required to fix the shielding cover in position, and the operation thereof is also troublesome.

The present invention aims to make it possible to adjust the charging width with a simple operation and without the need for tools. A hole is provided in one part of the case and a protrusion that engages in the hole is provided in the other part, and at least one of the hole or the protrusion is arranged at a predetermined interval in the longitudinal direction of the shield case, and the hole and the protrusion are arranged at a predetermined interval in the longitudinal direction of the shield case. The feature is that the charging width can be adjusted by changing the engagement position with the protrusion.

Hereinafter, embodiments of the present invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a corona discharge device used, for example, in a transfer station of an electrostatic photocopying machine, and 2 is a shield case, which has a discharge opening 4 that opens on the photoreceptor 3 side. A thin wire 5 for corona discharge is provided inside.

Reference numerals 6 and 6' denote a pair of bases on which the corona discharge thin wire 5 is stretched; 7 a handle extending from one base 6 to one side; and 8 a lower surface of the bottom plate 2a of the shield case 2. With a fixed guide member,
A shaped member 9, 9' formed by the guide member 8 and the bottom plate 2a is fitted into a support frame 10 on the aircraft body side, and by grasping the handle 7 and pushing or pulling it, the corona discharge device 1 can be moved along the support frame 10 and attached/detached.

Next, reference numeral 11 denotes a shielding cover, which is made of an elastic insulating material such as polycarbonate or DURANEX (trade name), and has a roughly shaped vertical cross section as shown in FIGS. 2 and 3.

Left and right side plates 11a and 11b of this shielding cover 11
are provided with protrusions 12, 12' projecting outward, and at the longitudinal ends of the shield case 2 facing the left and right side plates 11a, 11b are provided with protrusions 12, 12' spaced apart from each other at a predetermined interval in the longitudinal direction of the shield case 2. a plurality of holes 13..., 1 into which the protrusions 12, 12' are inserted;
3'... is provided.

Thus, the projections 12, 12' fit into the hole 13.
..., 13'..., as shown in FIG. Along with being installed,
By changing the position of the shielding cover 11, the charging width of the corona discharge fine wire 5 can be adjusted as appropriate.

Alternatively, when the corona discharge device 1 is used for photoreceptors 3 having different axial lengths, the protrusions 12, 12' may be inserted into the holes 13, 13' corresponding to the photoreceptors 3 having a certain axial length. Therefore, the corona discharge device 1
The charging width can be set as specified.

Next, FIGS. 4 and 5 show second and third embodiments, and in the one shown in FIG.
In addition to providing projections 12b and 1 on the inside of the left and right side plates 2b and 2c,
2'b, and the protrusions 12a, 12'a, 12
A plurality of holes 13..., 1 which engage b, 12'b
3' are provided on a shielding cover 11 having a generally shaped vertical cross section, so that the shielding cover 11 can be attached to the shielding case 2 so as to be removable and repositionable in the longitudinal direction of the shielding case 2.

Next, FIGS. 6 and 7 show a fourth embodiment, in which the shielding cover 11 is formed into a flat plate, and there are projections on both the left and right sides.
2c, 12'c are provided, and holes 13..., 1 are provided in the upper parts of the left and right side plates 2b, 2c of the shield case 2.
3'... are formed so that the shielding cover 11 can be attached to the longitudinal end of the shielding case 2 so as to be detachable and repositionable.

As explained above, the present invention provides a hole on one side of the shielding cover and the end of the shield case, and a protrusion on the other side, and at least one of the hole or the protrusion is arranged at a predetermined interval in the longitudinal direction of the shield case. It has now become possible to adjust the charging width of the thin wire for corona discharge by a simple operation that does not require any tools, simply by changing the insertion position of the protrusion into the hole.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of a corona discharge device, FIG. 2 is a longitudinal sectional view of the same main part, and FIG. 3 is a perspective view of a shielding cover.
Figures 4 and 5 show other embodiments, Figures 4 and 5 are longitudinal sectional views of the second and third embodiments, and Figures 6 and 7 are perspective views and longitudinal sectional views of the fourth embodiment. It is. DESCRIPTION OF SYMBOLS 1... Corona discharge device, 2... Shield case, 3... Photoreceptor, 4... Opening, 5... Thin wire for corona discharge, 11... Shielding cover, 12, 1
2', 12a, 12'a, 12b, 12'b... protrusion, 13, 13'... hole.

Claims (1)

[Scope of utility model registration request] A shielding case having an opening opening toward the photoconductor side and having a thin wire for corona discharge inside thereof has a shielding cover provided at a longitudinal end of the opening for adjusting the charging width of the thin wire for corona discharge. In a corona discharge device for an electrostatographic copying machine, which is provided in a detachable and removable manner, a hole is provided in one of the shield cover and the shield case portion facing the shield case, and a protrusion that engages in the hole is provided in the other,
and at least one of the holes or projections is arranged at predetermined intervals in the longitudinal direction of the shield case, and the charging width is adjusted by changing the engagement position between the hole and the projections. A corona discharge device in an electrostatographic copying machine, characterized in that: