JPS61145578A - Method for bonding fixing parts with cleaning blade for electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To enable adhesion operation high in productivity and precision by bringing one side of a specified hot melt adhesive film coated with a primer layer into face contact with the surface of the face of a cleaning blade. CONSTITUTION:The one side of the hot melt adhesive film 3 well adhesive to a metal, coated with the primer layer is brought into face contact with the face to be bonded of the nonmetallic cleaning blade 1 made of a urethane rubber or the like, and the film 3 is located between the metallic fixing member 2 and the cleaning blade 1, and they are heated to carry out hot melt bonding, thus permitting adhesion fixation high in productivity and precision between the cleaning the face of the blade 1 to be bonded with the primer uniformly with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of bonding a cleaning blade for an electrophotographic copying machine and a mounting bracket.

(Prior Art) Conventionally, a cleaning blade method has been known as a method for removing toner remaining on the surface of a photoreceptor in an electrophotographic copying machine (hereinafter referred to as "PPOJ"). A cleaning plate V (hereinafter referred to as a "blade") made of rubber such as urethane rubber or the like formed into a shape is adhesively fixed to the mounting bracket that is attached to the main body of the device, and the tip edge of the blade is attached to the surface of the rotatable photoreceptor. It is used in physical contact with a predetermined pressing force, and the residual toner on the photoreceptor is removed by the rubbing action with the surface of the photoreceptor.The structure is very simple, so it has already been put into practical use. ing.

Therefore, in such a blade method, as the blade material! In addition to selecting a material with excellent abrasion resistance and lubricity, the blade should be placed in the specified position on the mounting bracket so that the tip edge of the blade appropriately rubs against the surface of the photoconductor under a specified pressing force. It is particularly important that the adhesive be fixed in position with high precision. If the blade is not mounted and fixed with high precision, the blade will wear rapidly and unevenly, and the cleaning effect will be drastically reduced.

In extreme cases, the blade and the surface of the photoreceptor do not rub against each other partially or completely, and a clear image cannot be obtained on the recording paper, which would not provide any cleaning effect at all.

On the one hand, there arises the problem of damaging the photoreceptor.

Due to such circumstances! Conventionally, as a method of bonding the blade and the mounting bracket, there is a method of directly interposing a film hot melt adhesive between the blade and the mounting bracket.
However, none of these film-like hot-melt adhesives exhibits good adhesion to both the blade (elastic member) and the mounting bracket (metal), and those with excellent adhesion to metal are generally used. Therefore, the adhesiveness with the blade is poor, and it is difficult to obtain adhesive strength that can withstand practical use. This is made even more difficult by the fact that the blade material has not only wear resistance but also lubricity, and the blade surface has a highly precise mirror finish.

In order to improve the adhesion to the blade surface, various methods can be used.9 For example, chemical treatment such as corona discharge treatment can be applied to the grade surface, or liquid treatment can be easily performed. However, chemical treatments such as corona discharge treatment require large-scale and expensive equipment and are not suitable for mass production.

On the other hand, in the case of a solvent-based primer application process, there is an inherent barrier to deterioration or deformation such as swelling of the blade, and emulsion-type or solvent-free types are generally not expected to have much of an effect on improving adhesion. In addition, in the primer application process, there are difficulties in uniform application, material contamination due to excessive application, and contamination of the adhesive press equipment.
Problems such as increased grade rigidity arise due to application to extra locations.

As explained above, at present, no bonding method has been found that enables highly productive and highly accurate bonding.

(Problems to be Solved by the Invention) The present invention was invented based on the above-mentioned circumstances, and it is possible to produce products that eliminate the above-mentioned conventional drawbacks by devising a method for using the primer used to improve adhesion. It is an object of the present invention to provide a method for bonding a grade and a mounting fitting that has excellent properties and enables highly accurate bonding.

(Solution Means) In the bonding method of the present invention, a single layer of primer is formed on one side between the blade surface to be bonded and the mounting metal surface to improve adhesion to the blade. It is characterized in that a film-like hot melt adhesive with good adhesiveness is interposed on the mounting fitting so that the primer layer faces the blade surface, and then heat-fused.

The grade in the present invention is urethane rubber.

An elastic member such as a thermoplastic fluorine elastomer formed into a plate shape or a substantially plate shape with a modified cross section is used. The hardness of the grade material.

It is formed to have a JI8 hardness of about 60 to 80 so that it can be appropriately rubbed on the surface of the photoreceptor under a predetermined pressing force.

The mounting bracket in the present invention is made of iron or non-ferrous metal,
In particular, iron plated for rust prevention or decoration is used, and in consideration of such plating and high-precision installation, mw polishing to improve adhesion is usually not possible. .

The film-like hot-melt adhesive used in the present invention to bond the blade configured as described above and the mounting hardware is a modified polyamide-based or polyester-based adhesive that has excellent adhesion to metals.

Resin-based materials such as modified olefin-based materials are appropriately selected and used. The thickness of this film hot melt adhesive is 1
Usually, those within the range of about 20 to 200 microns are used.

If it's completely out of this range.

The uniformity of the film is likely to be impaired, and if the film is mixed, problems such as the inability to maintain uniformity during melting may occur, which is not preferable.

D1 The primer used in the present invention is appropriately selected from resin-based or rubber-based primers such as urethane thread, polyester thread, silane-based, polyamide-based, etc., depending on the material of the blade.

On one side of the film adhesive in the present invention.

The above primer is applied using a simple coating machine equipped with a sponge roller, brush, etc., and dried to a thickness of 10~
A single layer of primer having a uniform thickness of about 100 μm is formed.

In addition, the cover film adhesive has a release sheet laminated on the side on which the primer layer is not formed, and the film width is also shaped in advance to be the same as the predetermined bonding width, so that when bonding, After cutting to length, it is temporarily fixed to the grade surface.

Next, the release sheet is removed, and the adhesive is heat-fused to the mounting material before use.

Note that the heat fusing means in the present invention is a hot platen.

Known methods such as ultrasonic waves and high frequency waves are selected and used as appropriate, but in particular, in order to achieve high-precision adhesion as in the present invention, it is necessary that the grade made of one elastic member does not produce deformation noise due to heating. Therefore, it is preferable to heat only the fittings (120 to 180°C), and not particularly heat the grade, or to forcefully cool it.

(Example) First, a blade made of urethane rubber and Borienute V resin (width 15 mm x length 24 Q mm x thickness 2 mm) was made by a known method such as cast centrifugal molding or extrusion molding.
Mounting bracket made of galvanized steel sheet with a curved cross section (length 2
40 mm x thickness 2.3 mm) was prepared.

Table 1 for gluing such blades and mounting brackets.
V-shaped hot melt adhesive shown in 1
tssmm x thickness 100μ) in the form of a tape, and one side of each film was coated with a primer (viscosity 2000P8) as shown in Table 1. It was applied uniformly using a sponge roller and dried to form a single layer of primer (thickness: 20 μm). Next, this film-like hot melt adhesive was cut into a predetermined length (24071g).

Press in place on the grade (pressing temperature is room temperature or 1
00″C or less).

Then, place it on the fill that has been temporarily fixed to such a grade, place the blade on top of it, and perform fusion for 1 to 2 minutes. At this time, the blade side is forcedly cooled so as not to cause thermal deformation of the blade itself. was applied.

The product thus obtained, as shown in FIG. 1, was examined for its outsideness, adhesion, installation accuracy, etc.

The results are shown in Table-1. As a comparative example.

Table 1 also includes the results when no primer was used (Comparative Example 1) and when one primer was applied to the blade (Comparative Example 2).

Table-1 Note 1) 90° peeling Note 2) Softening temperature 140-160℃ Note 3) Softening temperature 90~120″C (Effect of the invention) According to the bonding method of the present invention as explained above.

A puff that improves adhesion to the blade on one side.

Imer M't-formed. Since we use a film-like hot melt adhesive with good adhesion to the mounting hardware, there is no need for special treatment to improve adhesion such as corona discharge treatment, and adhesion is dramatically improved. Expensive equipment and processes for applying primer to blades with high precision can be omitted.

Productivity and economy are improved, and there is no need to apply primer to excess areas of the blade, contaminating the blade, or as a result9, for example, in the case of solvent-based primers, the blade may swell, deteriorating or deforming. The stiffness of the blade can be changed by applying it to extra areas, or Fi or. This eliminates the problem of not only contaminating the blade itself but also contaminating the main body of the adhesive press, resulting in the inability to obtain levelness.

High-precision adhesion is possible, and the blade can be attached to the copying machine body with high precision. Therefore.

According to the blade device manufactured by the bonding method of the present invention, highly accurate attachment can be achieved.

Uneven wear and tear of the blade is eliminated, and an excellent jJ-ning effect can be achieved over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a blade device for explaining the present invention.

Claims (1)

[Claims] In a method of bonding a substantially plate-shaped cleaning blade for an electrophotographic copying machine made of an elastic member to a mounting bracket to be attached to an apparatus main body, a primer layer is provided on one side between the blade surface to be bonded and the mounting bracket surface. A film-like hot-melt adhesive with good adhesiveness is interposed on the mounting bracket formed with the primer layer so that the primer layer faces the blade surface, and then the blade and the mounting bracket are bonded and fixed by heating and fusing. A method of adhering a cleaning blade for an electrophotographic copying machine and a mounting bracket, characterized by: