JPH07319352A - Cleaning blade for electrophotographic copying machine and its production - Google Patents

Abstract

PURPOSE:To eliminate the need for using adhesives and to absolutely prevent loosening and separating by forming a blade shape within molds and integrating and joining blades to planar holding materials by an injection molding means. CONSTITUTION:The front ends of the holding materials 1 are provided with many through-holes and two pieces of the planar holding materials 1, 1 are oppositely set apart a prescribed spacing in the molds of an injection molding device 4. A thermoplastic synthetic resin and polyurethane are injected in this state into the pouring mold 42. Consequently, the connected blade 20 having the respective front ends 12, 12 of two pieces of the holding materials at its both side ends 21, 21 is formed. The connected blade 20 is taken out of the injection molding molds 41 and is then cut at the central part C, by which two pieces of the cleaning blades are produced. Both members are integrated by the injection molding means at the time of joining the planar holding materials 1 and the blade 2 in such a manner and, therefore, the loosening and separating are absolutely prevented without using the adhesives.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning blade for an electrophotographic copying machine and a manufacturing method thereof,
Specifically, the invention relates to the structure of the joint between the plate-shaped holding material that constitutes the cleaning blade and the blade, and the method of joining the two members.

[0002]

2. Description of the Related Art Regarding the above cleaning blade, JP-A-62-3276 and JP-A-63-147181.
No. 60-69680 and 3-107.
The technology is disclosed in Japanese Patent No. 983 and the like.

The outline of the disclosed technique will be described below with reference to FIGS. 5 and 6. (1) The plate-shaped holding material 1'is fixed to both ends of the blade 2 ', and cut at the middle portion M of the blade 2'of rubber or polyurethane material to form the cleaning blades 10' that function independently of each other. (2) The plate-shaped holding portion 1'and the blade 2'are fixed to each other via the adhesive 3 '. (3) A chemical agent such as fluororesin powder is applied to the surface of the blade 2 '.

[0004]

As shown in FIGS. 5 and 6, the conventional cleaning blade has a structure in which the groove 3'formed in the blade 2'is inserted into the plate-shaped holding material. There is a defect that the mounting portion becomes slack because it is in sliding contact with the photosensitive drum and the blade is always forced to pull in one direction. The present invention solves this drawback.

[0005]

According to the present invention, when a plate-shaped holding material and a blade are joined, a joining portion between the holding material and the blade is integrated. A large number of through holes are formed in the through hole, and the blade is attached while the through holes are filled with the blade material. The filling of the above-mentioned through holes can be completely performed by casting with an injection molding means.

[0006]

The joint between the plate-shaped holding material and the blade according to the present invention is constructed so that both members are integrated so that it can be used for a long period of time by loosening due to use.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a plate-shaped holding material according to the present invention. The holding material 1 has the same shape as a known holding material, and is characterized in that a large number of through holes 11 are provided in a front end portion 12 of the holding material 1. Is to have.

FIG. 2 is a sectional view of an essential part for explaining the manufacturing method of the cleaning blade. As is apparent from the figure, the two plate-shaped holding materials 1 for the mold 41 of the injection molding device 4 are used. , 1 are set facing each other at a predetermined interval, and a thermoplastic synthetic resin such as polyurethane is poured into the casting mold 42 in this state. As a result, the connecting blade 20 is formed in which the front ends 12 and 12 of the two holding materials are the side ends 21 and 21.

The connecting blade 20 is taken out from the injection mold 41 and then cut at the central portion C to produce two cleaning blades 10. FIG. 3 shows a cleaning blade manufactured by the above method. As is clear from the figure, the cleaning blade 1
A blade 2 is attached to the tip portion 12 of the plate-shaped holding material 1 so that the through hole 11 of the blade 1 is filled with the blade material 22 and the jaw portion 13 of the through hole is wrapped.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the side end 21 of the blade 2 is the through hole 1
Although it is located at a position where it does not cover the whole 1, the molding mode in which the jaw 13 of the through hole is wrapped with a blade material is maintained. In the manufacturing method of the cleaning blade described above, a thermoplastic synthetic resin containing a cross-linking material such as polyurethane or an unsaturated thermoplastic synthetic resin is used as a material applicable to injection molding as a blade material.

Each of the above-mentioned materials has the same effect as a known thermosetting two-component polyurethane or rubber polyurethane rubber as a blade material, and in particular, it can be filled into the through hole by using injection molding means. It has advantages. The present invention is not limited to the above embodiment, and in particular, the shape of the through hole of the plate-shaped holding material can be arbitrarily designed such as an elliptical hole, a square hole, or the number of sizes.

In the manufacturing method of the cleaning blade, a symmetrical blade is formed with respect to the two plate-shaped holding materials, but it is also possible to form a single cleaning. Further, the cutting shape of the blade can be designed particularly freely.

Although not shown in the drawings, the joining portion can be integrated by forming saw teeth or unevenness at the tip of the plate-shaped holding material to increase the contact resistance with the blade. Further, instead of the injection molding means, a two-liquid casting direction can be adopted.

[0014]

According to the present invention, when the plate-shaped holding material and the blade are joined together, the two members are integrated by injection molding means, and the joint structure is a jaw having a large number of through holes formed at the tip of the blade by the blade material. It is formed so as to wrap the part, and the both members do not use the adhesive used in the conventional method and are never loosened or separated.

[Brief description of drawings]

FIG. 1 is a plan view of a plate-shaped holding material according to the present invention.

FIG. 2 is a cross-sectional view of an essential part of an injection molding apparatus showing a method of manufacturing a cleaning blade according to the present invention.

FIG. 3 is a cross-sectional view of essential parts of a cleaning blade according to the present invention.

FIG. 4 is a cross-sectional view of essential parts of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a manufacturing method of a conventional example.

FIG. 6 is a cross-sectional view of a main part of a conventional joint structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped holding material 2 Blade 4 Injection molding device 10 Cleaning blade 11 Through hole 12 Tip part of holding material 13 Jaw part of through hole 20 Connecting blade 22 Blade material

Claims (2)

[Claims] 1. A plate-shaped holding member having a large number of through holes at its tip is positioned in a mold, a blade shape is formed in the mold, and the plate-shaped holding member is formed by injection molding means. ,
A cleaning method for an electrophotographic copying machine, characterized by integrally joining blades. 2. A cleaning blade for an electronic copying machine, characterized in that a large number of through holes are provided at the tip of the plate-shaped holding material, and the jaws of these through holes are attached so that the blade member is wrapped with the blade material.