JPH0143726Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fur brush cleaning device used in electrophotographic copying machines, etc., and is particularly designed to facilitate installation and centering of the fur brush when installing it in the main body of the copying machine. This invention relates to a fur brush cleaning device with improved maintainability.

Toner remaining on the surface of the photoreceptor of an electrophotographic copying machine is scraped off and removed by rubbing the surface of the photoreceptor with a fur brush that rotates in a direction opposite to the rotational direction of the photoreceptor drum. This fur brush must be removed from the copying machine body for reasons such as maintenance and inspection. To install the fur brush in the copying machine body, the cylindrical fur brush is horizontally inserted into the copying machine body through an opening provided on one side plate of the copying machine body, and one end of the fur brush is installed inside the copying machine body. This is done by attaching a presser tool, which is fitted onto the rotatable rear core and whose other end is fitted onto the front core so that the front core can be rotated, to the side plate provided with the opening. This holding device must be attached to the side plate of the copying machine so that the center of the front core coincides with the center of the rear core in order to allow the fur brush to rotate smoothly, but in order to center the fur brush with high precision, If a part of the presser is fitted into the opening and attached to the side plate, toner may adhere between the periphery of the opening and the periphery of the presser, resulting in clogging, so please remove the presser when performing maintenance and inspection of the fur brush. The disadvantage is that it is difficult to remove and install. Furthermore, if the presser is not fitted into the opening, but the presser is pinned to the side plate of the copying machine body, and the centering of the fur brush is performed by finely adjusting the relative position of the presser and the side plate, It is difficult to completely align the center of the front core with the center of the rear core, and the centering of the fur brush tends to be insufficient, which is disadvantageous in that the fur brush rotating at high speed may cause vibration.

The present invention was developed in view of the above points, and provides a fur brush cleaning device that is easy to install on the copying machine body, and that can reliably center the fur brush and improve maintainability. The purpose is to provide. The present invention is characterized by: a fur brush that comes into contact with the surface of the photoreceptor to clean and remove toner on the surface of the photoreceptor; a rear core that is rotatably installed in the copying machine body and supports one end of the fur brush; A front core that supports the other end of the fur brush, and a presser that rotatably supports the front core and has a fitting portion for fitting and attaching to an opening provided in a copying machine main body,
The radius of the opening is longer than the radius of the fitting part, and a protrusion with a height substantially corresponding to the difference in radius between the opening and the presser is provided on the circumferential surface of the opening or the circumferential surface of the fitting part of the presser. The point is that it is formed in at least three places. Note that the projections are preferably distributed at equal angles in the circumferential direction.

Hereinafter, specific embodiments of the present invention will be explained. FIG. 1 is a schematic perspective view of the front core 2 and the presser 1 that support one end of the fur brush, FIG. 2 is a schematic perspective view showing the front core 2 and the presser 1 with the fur brush 3 attached, and FIG. The figure is a schematic vertical cross-sectional view showing the fur brush cleaning device installed in the copying machine body, and Figure 4 is the attachment part 5a.
FIG. The holding tool 1 has a shape in which a ring-shaped fitting part 1a of an appropriate width is formed on one side of a substrate having through-holes for screw fixing on four sides, and the outer circumferential surface of the tip thereof is slightly reduced in diameter and protrudes. A through hole is formed in the center of the board. The front core 2 has a shape in which a ring-shaped protrusion of an appropriate width is formed on one side of a disc-shaped substrate, and the outer peripheral surface of the tip is slightly reduced in diameter.
A shaft rod 2 is mounted in the center of the board via a bearing 2a.
The shaft rod 2b supports the front core 2 rotatably and movably in the axial direction. A pair of upper and lower locking pins 2c are formed at one end of the shaft rod 2b, and a locking plate 2 is formed at the other end.
e is fixed with a bolt 2f. A spring 2d is interposed between the rotation stopper pin 2c and the side surface of the front core 2, and the elasticity of the spring 2d biases the front core 2 toward the stop plate 2e. The peripheral radius of the disc-shaped substrate of the front core 2 is set to be shorter than the outer peripheral surface radius b of the fitting portion 1a of the presser 1 by δ,
The through-hole at the center of the substrate of the presser 1 is shaped to follow the outer shape of the shaft 2b and the locking pins 2c, 2c, and the locking pins 2c, 2c and the shaft 2b are inserted into the center through-hole of the holding tool 1. The holding tool 1 and the front core 2 are connected by fitting together and screwing the assembly knob 1b into the threaded portion at the end of the locking pin side of the shaft rod 2b.

A fur brush 3 is attached to the presser 1 and front core 2 assembled as described above, as shown in FIG. That is, one end of a cylindrical fur brush 3 having bristles implanted on its outer circumferential surface is fitted onto the outer circumferential surface (radius b-δ) of the annular protrusion of the front core 2. Next, as shown in FIG.
installed inside the copier. That is, the shaft rod 4b is installed inside the copying machine body via bearings 4c, 4c.
is rotatably attached, and the outer peripheral surface radius b of the annular protrusion of the front core 2 is attached to one end side of the shaft rod 4b.
A rear core 4 is attached to which a brush receiving portion 4a having a circumferential surface having the same radius as -δ is formed. A gear 4d is attached to the other end of the shaft 4b, and the gear 4d meshes with a spur gear 4e connected to a rotational drive source (not shown). The side core 4 is adapted to be rotated. A mounting portion 5a having an opening for inserting the fur brush 3 into the copying machine main body is formed on the side plate 5 of the copying machine body facing the rear core 4 so as to slightly protrude toward the outside of the copying machine main body. ing.

The present invention is characterized by the opening shape of the mounting portion 5a. The opening of the mounting portion 5a is located at a position where its center coincides with the center of the shaft rod 4b of the rear core 4, and the opening shape as a whole has a radius (b +
It is hollowed out to form a circle as shown in a), and protrusions are formed at four equally spaced positions on the circumferential surface of the opening. The tip surface of this protrusion is curved to follow the circumference of a radius b centered on the opening center, and in short, the opening shape of the mounting portion 5a has a height a on four sides of a circular hole with a radius (b+a).
The protrusions are formed. In addition, the outer shape of the mounting portion 5a that slightly protrudes from the side plate 5 is
It has a shape that matches the outer shape of the substrate (see figure), and female screws are formed on four sides at positions that match the screw-fastening through holes of the presser 1. Therefore, the fur brush 3 (see FIG. 2), whose one end is fitted to the front core 2, is inserted from the other end into the copying machine main body through the opening of the mounting portion 5a, and the other end of the fur brush 3 is fitted to the rear side. When the core 4 is externally fitted and supported by the brush receiver 4a, and the presser 1 is fitted into the opening of the mounting portion 5a and screwed down (see Fig. 3),
The outer peripheral surface of the fitting portion 1a of the presser 1 and the attachment portion 5
The tip surface of the protrusion of the opening of a is brought into contact with the presser tool 1.
, and the center of the front core 2 is the mounting portion 5a.
The presser 1 is aligned with the center of the opening of the mounting part 5.
a, and the fur brush 3 is installed with the center of the front core 2 aligned with the center of the rear core 4.

As described above, the fur brush cleaning device according to the present invention can easily and accurately center the fur brush 3 by simply fitting the presser 1 into the mounting portion 5a when installing the fur brush 3 in the main body of the copying machine. can. Further, when the presser 1 is fitted into the mounting portion 5a, the outer circumferential surface of the fitting portion 1a of the presser 1 and the opening circumferential surface of the mounting portion 5a contact only at the tip end surface of the protrusion of the opening. In most areas, they are separated by a gap distance a, so
Even if toner adheres to the periphery of the presser 1 and the periphery of the opening of the attachment portion 5a, no problem will occur when the presser 1 is attached or removed. Furthermore, even if toner adheres to the tip of the protrusion in the opening of the mounting portion 5a, the presser 1
Slightly rotate the protrusion end surface and the fitting part 1 of the presser 1.
By rubbing the outer circumferential surface of a, the adhered toner falls off and the presser 1 can be easily removed and attached.

The dimension of the gap distance a may be determined as appropriate, but when this dimension was set to 0.5 mm, for example, there was no inconvenience that the presser 1 was difficult to attach or detach due to toner clogging. Further, the centering of the fur brush 3 could be performed easily and with high precision.

In the above embodiment, as shown in FIG. 4, protrusions were formed at four locations on the opening circumferential surface of the mounting portion 5a, but the same effect can be achieved if these protrusions are formed at at least three locations. Of course. In this case, it is preferable in terms of centering accuracy of the fur brush 3 that the protrusions be formed at equidistant positions on the peripheral surface of the opening. Further, the protrusion may be formed on the outer circumferential surface of the fitting portion 1a of the presser 1 instead of being formed on the opening circumferential surface of the mounting portion 5a as in the above embodiment. That is, the opening shape of the mounting portion 5a may be a circle with a radius (b+a), and at least three protrusions with a height a may be formed on the outer peripheral surface (radius b) of the fitting portion 1a of the presser 1.

As explained in detail above, according to the present invention, at least three protrusions are formed on the opening circumferential surface of the attachment part of the copying machine body or on the outer circumferential surface of the fitting part of the presser, so that when the fur brush is installed in the copying machine. centering can be performed with high precision and easily, and even if toner adheres to the periphery of the opening of the mounting part and the periphery of the fitting part of the presser, the presser can be easily removed and attached from the mounting part. can. As described above, the fur brush cleaning device according to the present invention is easy to inspect and has extremely high maintainability.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the front core 2 and the presser 1, and FIG. 2 is a schematic perspective view showing the front core 2 and the presser 1 with the fur brush 3 attached.
Figure 3 is a schematic vertical cross-sectional view showing the fur brush cleaning device installed in the main body of the copying machine;
The figure is a schematic diagram of the attachment part 5a. Explanation of symbols of main parts: 1: Holder, 1a: Fitting part, 2: Front core, 3: Fur brush, 4:
Rear core, 4a: brush receiver, 5a: mounting part.

Claims (1)

[Claims for Utility Model Registration] 1. A fur brush that comes into contact with the surface of a photoconductor to clean and remove toner on the surface of the photoconductor, a rear core that is rotatably installed in a copying machine body and supports one end of the fur brush, and The front core is provided with a front core that supports the other end of the fur brush, and a presser that rotatably supports the front core and has a fitting portion for fitting into and attaching to an opening provided in the main body of the copying machine. The radius is longer than the radius of the fitting part, and at least 3 protrusions with a height substantially corresponding to the difference in radius between the opening and the presser are provided on the circumferential surface of the opening or the circumferential surface of the fitting part of the presser. A fur brush cleaning device characterized in that it is formed in several places. 2. The fur brush cleaning device according to item 1 above, wherein the protrusions are distributed at equal angles in the circumferential direction.