JPH0430596Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an improvement in the structure of a grid-controlled charger in which a grid is attached to the joint surface of a chassis.

Background of the Technology An electrophotographic line printer is a non-impact printer that uses laser optical technology and dry electrophotographic recording technology, and its configuration is shown in Figure 1. In the figure, 1 is a photosensitive drum with a photoconductive photoreceptor formed on its outer periphery, 2 is a charger, 3 is an optical unit, and 4
is a developing device, 5 is a transfer station, 6 is a fixing device,
7 is a static elimination lamp, 8 is a cleaning brush, and 9 is a toner collection system. The charger 2 uniformly charges the surface of the photoreceptor on the outer periphery of the photoreceptor drum 1 rotating in the direction of the arrow by corona discharge. Note that corona discharge is generated around the corona wire by applying a high voltage between the corona wire and the chassis. The optical unit 3 performs image exposure on the uniformly charged surface of the photosensitive drum 1 to form an electrostatic latent image. The developing device 4 attaches toner, which is a colored resin powder with an electric charge, to this electrostatic latent image by electrostatic force to form a visible image. This toner image is transferred by a tractor 10 at a transfer station 5 to a sheet 11 that is pressed against the photosensitive drum 1 . Paper 11
The transferred image is heated and fixed by a fixing device 6. After the transfer has been completed, the surface potential of the photosensitive drum 1 is removed by a static eliminating lamp 7, and then the surface of the photosensitive drum 1 is cleaned by a cleaning brush 8 to remove residual toner. The removed toner is collected by a toner collection system 9.

Prior Art and Problems As a conventional charger for this type of electrophotographic line printer, a grid control type charger in which a grid is fixed to the joint surface of a chassis is generally used.

By the way, with a charger configured like this, it is necessary to clean the grid at regular intervals.
A structure that allows the grid to be easily attached to and removed from the chassis is desirable.

Purpose of the invention The purpose of this invention is to realize the above-mentioned demands.
It is an object of the present invention to provide a grid control type charger that allows the grid to be easily attached to and removed from the chassis.

Structure of the Invention The present invention is a grid control type charger in which a grid is detachably attached to a chassis, and the grid is formed of a flat member and is attached to a flange constituting the chassis. It has a rotatable member which is rotatably provided and which presses and holds the grid against the joint surface of the flange facing the photoreceptor by rotating with respect to the flange; a plate-shaped main body that presses against the bonding surface; and a claw-like fixing part that is integrally formed with the main body and comes into elastic contact with a back surface of the flange that does not face the photoreceptor. We aim to achieve the above objectives by using the characteristic grid control type charger.

Embodiments of the invention Hereinafter, embodiments of the invention will be described with reference to FIGS. 2 to 5.

2 is an external perspective view of the grid control type charger according to the present invention, FIG. 3 is a plan view of the main part, and FIG. 4 is a side sectional view of the same. In the figure, 21 is a chassis, 22 is a mesh grid, 23 is a rotating member.

The rotating member 23 is a member for fixing the grid formed of a spring plate, and is attached to both sides of the mesh grid 22 via pins 24, and is attached to the chassis 21.
It is rotatable along the joint surface with the flange 25 of. A fixing portion 26 having a substantially U-shaped cross section is integrally formed at the tip of the rotating member 23 .

Further, the fixing portion 26 is provided on the side of the flat mesh grid 22 that does not face the photosensitive drum 1, and fixes the mesh grid 22 to the flange 25 of the chassis 21 while being elastically pressed and clamped.

The mesh grid 22 is attached to the chassis 21 by operating the rotating member 23, and the procedure will be explained next with reference to FIGS. 3 and 4.

Now, both sides of the mesh grid 22 are set on the upper surface (joining surface) of the flange 25 of the chassis 21, and the rotating member 23 is rotated from the state shown on the left side of FIG. 3 to the state shown on the right side of FIG. As shown in FIG. 5, the fixed portion 26 of the rotating member 23 elastically clamps the side of the mesh grid 22 and the flange 25 of the chassis 21, and this clamping force causes the mesh grid 22 to be attached to the chassis 21. Fixed. FIG. 4 shows this fixing completed state.

When removing the mesh grit 22 fixed in this way for cleaning etc., the rotating member 23
It can be easily removed by rotating the fixing part 26 to its original position and retracting the fixing part 26 from the mesh grid 22.

Note that 27 (see FIG. 3) is a pin fixed to the upper surface of the flange 25 of the chassis 21, and is used to position the mesh grid 22 when it is attached to the chassis 21. Further, 28 (see FIG. 4) is a corona wire for corona discharge.

A summary of the mounting method is as follows.

Both rotating members 23 are opened to the outside of the chassis 21 (the left rotating member 23 in FIG. 3 is open).

The mesh grid 22 is set on the upper surface of the chassis 21 so that the recesses provided at both ends of the mesh grid 22 match the positioning pins 27. In that state, the rotating member 23
does not come into contact with mesh grid 22.

Both rotating members 23 are rotated inward. At that time, the lower side of the main body of the rotating member 23 and the flange 2
5 sandwich the mesh grid 22, and the fixing part 26 presses against the lower surface of the flange 25, thereby holding the mesh grid 22 against the chassis 21.
2 is fixed.

Effects of the Invention As described above, according to the present invention, it is possible to easily attach and detach the grid to and from the chassis with a single touch.

In addition, in the present invention, since the flat mesh grid is elastically pressed and held by the rotating member, it is possible to fix the mesh grid without applying tension to it, and the structure of the grid control type charger can be made smaller. Furthermore, the fixing part is provided on the side of the mesh grid that does not face the photosensitive drum, and when the mesh grid is fixed, it can be accommodated within the occupied area of the chassis, so that further miniaturization can be achieved.

That is, by providing the fixing part on the side that does not face the photoreceptor, even if the fixing part is bent to have elasticity, it is possible to reduce the gap between the grid and the photoreceptor. Furthermore,
Since the fixing part is configured to be housed in the flange of the chassis on the back side in the fixed state, it occupies only the area of the chassis, making it possible to further reduce the size.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the configuration of an electrophotographic line printer, Figs. 2 to 5 show an embodiment of the grid control type charger according to the present invention, and Fig. 2 is an external appearance of the grid control type charger. 3 is a plan view of the same essential parts, FIG. 4 is a side view of the same, and FIG. 5 is an explanatory diagram of the method of fixing the grid. In the figure, 1 is a photosensitive drum, 21 is a chassis, 22
23 is a mesh grid, 23 is a rotating member, 24 is a pin, 25 is a flange, and 26 is a fixed portion.

Claims (1)

[Claims for Utility Model Registration] A grid control type charger in which a grid is detachably attached to a chassis, wherein the grid is formed of a flat plate-like member, and a flange constituting the chassis is provided with a grid control type charger. a rotating member that is rotatably provided and that presses and holds the grid against the joint surface of the flange facing the photoreceptor by rotating with respect to the flange; It consists of a plate-shaped main body that presses the grid against the joint surface, and a claw-like fixing part that is integrally formed with the main body and comes into elastic contact with the back surface of the flange that does not face the photoreceptor. A grid-controlled charger featuring: