JPS60166979A - Cleaning blade - Google Patents

Abstract

PURPOSE:To provide excellent durability which withstands substantially the oscillation, impact, etc. applied repeatedly from a transer drum to a blade by providing an elastic material layer to a blade holding metallic fitting and unitizing the elastic material layer and the blade via an adhesive agent layer. CONSTITUTION:A blade 10 is manufactured by using a polyurethane rubber, silicone rubber, etc. On the other hand, an elastic material layer 40 is formed on a fitting 20 for holding a blade by using polyurethane rubber, etc. The blade 10 and the layer 40 of the fitting 20 are united to one body via an adhesive agent layer 30 (e.g.; a hot melt adhesive agent layer) by which the intended cleaning blade is manufactured. The blade 10 is pressed to the surface of a transfer drum 50 by adequate pressing force and the oscillation, impact, etc. applied from the drum 50 to the blade 10 are relieved by the layer 40 by which the dislodging, etc. of the blade 10 are prevented in the stage of cleaning the surface of the drum 50 by rubbing the same with the blade 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning blade suitably used to remove and clean toner remaining on the surface of a transfer drum of an electrophotographic copying machine or the like.

Conventionally, cleaning blades used for the above purposes are:
As shown in Figure 1, a thin plate-shaped grade (1) with a rectangular longitudinal section and a blade holding metal fitting (2) r
Hereinafter simply referred to as "holding metal fittings"] is an adhesive l111il.
Books directly integrated via (3) are known.

However, the cleaning performance of such cleaning grades depends on the characteristics of the blade (rigidity, wear resistance, etc.), shape,
It depends on the precision of the tip edge and the pressure state of the tip edge on the transfer drum surface, and is used with the blade in contact with the appropriate angle and pressure force.

As the impact is repeatedly applied, stress concentration occurs at the adhesive interface between the holding fitting and the blade.

In particular, since blades are required to have appropriate rigidity and wear resistance, they are often formed with a JI8-A hardness of about 60 to 90. Stress concentration is unavoidable, leading to the problem of adhesive delamination during use.

The present invention was invented to solve these drawbacks, and provides a cleaning blade with excellent durability that can withstand repeated vibrations from the transfer drum and stress concentration on the adhesive interface. It is intended to.

In order to achieve such an object, the present invention provides a cleaning blade in which a blade and a holding metal fitting are integrated, in which an elastic body M is provided on the holding metal fitting, and an adhesive layer is provided between the elastic body layer and the blade. It has an integrated structure.

The present invention will be explained in detail below based on two examples.

FIG. 2 shows an embodiment of the present invention, with a thickness of 1.2 mm,
Holding metal fittings (20) with a rectangular cross section, thickness 3 mm.

Length 5mff1. An elastic layer (40) with a rectangular cross section is provided, and the elastic layer (40) has a thickness of 2 mm and a length of 15 mm.
.

A plate-shaped blade with a rectangular cross section with a width of 2401FTFFJ (
10) and an adhesive layer (30) with a thickness of 200 μm is provided and integrated.

FIG. 3 shows another embodiment in which the cross-sectional shape of nine elastic layers (40) is changed.

In the present invention, the blade (1o) is made of polyurethane rubber, silicone rubber, or nitrile rubber.

Rubber materials such as styrene butadiene rubber are used.

Manufactured with consideration for rigidity, wear resistance, etc. 9 Normally J18-
A hardness having an A hardness of 60 to 90 is used.

For the adhesive layer (30), a room temperature curing type adhesive, a heat curing type adhesive, a hot melt type adhesive, etc. are used, but in order to fix the blade with high precision, a film hot melt adhesive is used because of its moldability. For example, thermoplastic urethane or the like is preferably used. The thickness of the adhesive layer (3o) is about 50 to 300 microns.

For the elastic layer (40), materials such as rubber and resin can be used as appropriate, but from the viewpoint of moldability, liquid cast moldable materials such as polyurethane rubber are used, and JI8-A hardness is 40 to 7.
I was bitten by the hardness of 0. The shape is.

If the bonding surface with the blade is configured to be flat, it can be integrated with the holding fitting (20) in any shape using a mold or the like.

The product of the present invention having the above-mentioned structure is manufactured in the following manner, two representative examples of which are shown below.

First of all, the blade fI:HTL shape is 〈. That is, by casting a predetermined amount of liquid urethane rubber or the like on the inner peripheral surface of a cylindrical drum to have a predetermined blade thickness, and then rotating the drum at high speed, a rubber sheet of urethane rubber or the like having a uniform thickness is produced. However, the centrifugal molding method is convenient for forming products with uniform thickness, and the surface that is not in contact with the inner circumferential surface of the drum has a mirror surface (, T
With a T S surface roughness of 5, a blade with a predetermined size and a highly accurate edge portion is obtained.

On the other hand, place a holding metal fitting on the mold and pour liquid polyurethane into it.1: Note! υ and harden to form the entire elastic layer on the holding fitting.

Next, a film-like hot melt adhesive (P
A desired cleaning blade is obtained by adhering using P plastic urethane (thickness 200μ).

In the product of the present invention as described above, the blade having appropriate rigidity is not integrated with the holder 4 only by the adhesive layer of extremely high MV, but is bonded and integrated with the holder 4 through the elastic layer provided on the holder. # To achieve this, the grade is rubbed against the surface of the transfer drum with an appropriate suppressing force. These are buffered by the elastic layer, and the grade can be prevented from sticking and falling off.

4: 1 Elastic body - Because it is formed into an extremely complex shape using a liquid cast moldable material, it has other characteristics that cannot be met by a blade with a uniform shape and characteristics9, such as durability. It becomes possible to add creep properties separately, which can contribute to improving the durability of the blade.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional cleaning grade, and Figures 2 and 3 are examples of the cleaning blade of the present invention. FIG. 10...Blade, 20...Holding fitting, 30...
Adhesive layer, 40... Elastic layer, 5o... Transfer layer.
U4 Patent Applicant Figure 1 Figure 3 3rd 50 6O

Claims (2)

[Claims] (1) A cleaning plate which is made by integrating a blade and a blade holding fitting for holding the blade, which rubs against the surface of the transfer drum to clean the surface. First, put an elastic layer on the large blade holding metal fitting. A cleaning blade characterized in that the elastic layer and the blade are integrated by providing an adhesive layer between them. (2) The cleaning blade according to claim (1), wherein the elastic layer is made of a material that can be cast in liquid form.