JPS60165683A - Cleaning blade - Google Patents

Abstract

PURPOSE:To display stable, superior cleaning performance by using an elastic body which is moldable by liquid injection for a coupling member which couples a plate type blade for cleaning a transfer drum surface with a blade fitting member. CONSTITUTION:The cleaning blade 40 consists of the plate type blade 10 which cleans the surface of the transfer drum 50 while rubbed against the surface of the drum 50, the blade fitting member 30 fixed to a device body for supporting the blade 10 at one end side of the blade 10, and the coupling member 20 which couples the blade fitting member 30 with the plate type blade 10. In this case, the coupling member 20 is made of the elastic body (e.g. polyurethane rubber) which is moldable by liquid injection to obtain the desired cleaning blade 40. Consequently, the coupling member 20 is designed in an complicate section shape, and creep resistance, pressure to the surface of the drum 50, etc., are designed optionally.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning blade suitable for removing and cleaning residual toner and the like.

Conventionally, as shown in Fig. 1, the cleaning grades used for such purposes include a thin plate-shaped blade (1) with a rectangular longitudinal section and a uniform thickness, and a blade attachment member (3) [hereinafter simply " 7FC adhesive or the like is known, and is made by pressing the tip edge (1a) of the blade (1) against the surface of the transfer drum (5) with a predetermined pressing force and rubbing the surface. I don't use it.

The cleaning performance of such a cleaning blade largely depends on the characteristics of the blade (rigidity, wear resistance, etc.), and the precision (roughness, linearity) of the tip edge is particularly important. In order to manufacture blades efficiently, blades having the uniform shape of a thin plate with a rectangular vertical cross section and a uniform thickness are usually manufactured from a single material.

However, grades made of a single material and having a uniform shape cannot satisfy all other required properties, including appropriate rigidity and wear resistance. For example, the grade is required to have creep resistance so that it can be pressed against the surface of the transfer drum with a predetermined pressing force for a long period of time and used in close contact with the surface with precision.

Therefore, in order to impart such characteristics to the blade, it is only possible to produce in small quantities by using a single material. There are some disadvantages such as inferior quality and increased costs.

The present invention was invented based on the above circumstances, and provides a cleaning product with excellent cleaning performance that can solve problems in characteristics that cannot be met with grades that are made of a single material and have a uniform shape. In order to achieve this purpose, the blade and the mounting member are not directly fixed to each other, but a connecting member made of an elastic material that can be liquid cast molded is interposed between the two to provide a cleaning blade. It was constructed.

The present invention will be described below based on nine examples.

FIG. 2 shows an embodiment of the cleaning blade (40) of the present invention, which has a gold mirror surface (J
Predetermined dimensions (erosion: 5mm, width: 240mm, thickness: 2m) formed on a high-precision surface with a height of 5S or higher.
The blade (1o) made of thin plate material is connected to the connection part tI (20).
It is fixed to the mounting member (3o) via the holder.

The blade (10) is made of an elastic material such as polyurethane rubber or silicone rubber with excellent wear resistance, and is connected to the connecting member (2).
0) is made of an elastic material such as polyurethane rubber that can be cast in liquid form, and the mounting member (3o) is made of a rigid material such as metal.

The hardness of each of the blade (10) and the connecting member (2o) is appropriately selected within the range of 118-A hardness of 50 to 9o.For example, the hardness of the blade (1o) is 50 ~7
0. The connecting members (20) are made to have a hardness of 70 to 9 degrees, and each blade (1o) is wear-resistant, and a predetermined amount of liquid polyurethane rubber or the like is injected onto the inner peripheral surface of the connecting member to make the blades have a predetermined thickness. A polyurethane rubber sheet having a uniform thickness is obtained by centrifugal molding by rotating the drum at high speed. This centrifugal forming method is convenient for forming sheets of uniform thickness, and the surface on the opposite side that does not touch the inner circumferential surface of the drum has a high precision surface roughness of 58 or more. formed on the surface).

This sheet is then cut as appropriate to obtain blades of a predetermined size and a tip edge having a predetermined precision.

The grade thus obtained is placed in a predetermined position in a mold together with a mounting member, and a predetermined amount of uncured liquid polyurethane rubber is poured into the mold and cured to form a desired cleaning blade IQ filter.

Note that curing with liquid polyurethane rubber can be done at room temperature or at high temperature; however, in order to prevent distortion (fringe shrinkage distortion, etc.) or deformation of the blade during such integration, room temperature curing is necessary. is preferred.

With the product of the present invention having the above configuration, the blade and the mounting member are integrated via a connecting member made of an elastic body that can be liquid cast molded, so that the blade and the mounting member are made of a single material and have a uniform cross section. This is different from the one in which the blade, which is molded into a shape, and the 11y attached member are directly integrated.

Since the connecting member can be designed to have a complex shape (cross section, etc.), problems such as spring constant, creep resistance, and pressure on the surface of the transfer drum that cannot be addressed with a uniform blade shape and characteristics can be solved. Against.

This makes it possible to easily and arbitrarily design the load-position curve for pressing the blade against the transfer drum surface, and furthermore, even if the blade is made of the same rigid material, it can be adjusted to a constant displacement. This makes it possible to freely set the load on the blade, which makes it possible to apply a more stable pressing force to the blade, and to obtain a cleaning grade that can exhibit stable cleaning performance.

In addition, since we use a connecting member made of an elastic body that can be cast into a # shape, it can be integrated with the blade without using adhesives, and the joint area with the Hitometsu mounting member can be designed to be arbitrarily large, ensuring a strong fixation. is obtained, durability is improved, and
By imparting grade characteristics other than wear resistance to the connecting member.

By adding only wear resistance to the blade, we have made it smaller (
(See Fig. 3).

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the mounting structure of a conventional cleaning blade, and FIG. 2 and FIG. 3 are vertical cross-sectional views showing respective embodiments of the cleaning blade of the present invention. 10...Blade, 11...Tip edge, 20...
- Connecting member, 30... Mounting member, 40... Cleaning blade, 50... Transfer drum Patent applicant Figure 1 Figure 3

Claims (2)

[Claims] (1) A plate-shaped grade that rubs against the surface of the transfer drum to clean the surface; and (9) a blade mounting member fixed to the main body of the apparatus to support the blade at one end thereof. A connecting member that connects the blade attachment member and the L blade. In a cleaning blade consisting of. A cleaning grade characterized in that the connecting member is made of an elastic material that can be cast in liquid form. (2) The cleaning blade according to claim (1), wherein the elastic body capable of liquid cast molding is polyurethane rubber.