JPH09218614A - Electrophotographic photoreceptor provided with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a flange at the open end of a cylindrical hollow base material with sufficient adhesive strength without causing deformation by providing a hole in an adhesion groove formed on a fit surface between the flange and the cylindrical hollow base material. SOLUTION: The adhesion groove 21 and the adhesion groove 22 are formed in the shaft direction and in the circumferential direction of the flange, respectively, and the hole 6 is provided in the groove 22. It is desirable to bore plural holes 6, though it is not so bad to bore one hole 6. It is desirable to provide the hole 6 in the groove 22 in the circumferential direction. Furthermore, the hole 6 must be deeper than the groove 22 but need not pass through, and it is preferable to set its depth to >=0.5mm. Since the hole 6 is provided in the groove 22, adhesive 3 completely gets into the groove 22. In the case the hole 6 passes through, especially, air in the groove 22 is discharged from the hole 6 to the inside of the cylindrical hollow base material 1, so that the adhesive 3 completely gets into the groove 22, consequently the adhesion becomes firm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a printer,
The present invention relates to a flanged electrophotographic photosensitive member used in an image forming apparatus such as a facsimile.

[0002]

2. Description of the Related Art Conventionally, an electrophotographic photoreceptor using a cylindrical hollow base material having an open end has a flange connected to at least one open end of the cylindrical hollow base material, and the flange is used as a center of rotation. ing. The following method is known as a method for joining the flange to the open end of the cylindrical hollow substrate. These will be described with reference to the drawings. First, a) as shown in FIG. 7, a one-part or two-part adhesive 3 such as an epoxy resin, a polyurethane resin or an acrylic resin is applied to the inner wall portion of the cylindrical hollow substrate 1. A method in which the coating is applied, and the flanges 2 (2A and 2B) are fitted and bonded from both sides, b) As shown in FIG. 8, with respect to the open end of the cylindrical hollow base material 1 provided with a photosensitive layer on the surface, A method in which the flange 2 is mechanically press-fitted and frictionally coupled by utilizing elastic / plastic deformation due to interference fit fitting, c) As shown in FIG. 9, a cylindrical hollow base material having a photosensitive layer provided on the surface thereof. A method is known in which the flange 2 is mechanically coupled to the open end of 1 by using the stay 5 and the nut 4 by sandwiching. Of these methods, the method a) is low in cost and the quality is relatively stable, and thus in recent years, most of the methods a) have been adopted.

[0003]

However, the conventional methods of using an adhesive are: 1) a method in which no groove for the adhesive is provided on the fitting surface of the flange, and 2) the adhesive flows and hardens. As a part, a method of providing a groove in the fitting surface of the flange in the axial direction, and 3) as shown in FIG. The method of providing is adopted.
However, in the method of 1) above, since there is no portion where the adhesive flows in, a liquid pool occurs at the end of the flange, and it is difficult to obtain sufficient adhesive strength. Although the tendency of the adhesive to flow can be confirmed, it is difficult for the adhesive to flow to the back of the groove because there is no part where air accumulated in the gap between the flange and the inner wall of the electrophotographic photosensitive member escapes. There is almost no confirmation of strength, and the method of 3) is
Similar to the method of 2) above, there is no space for air to escape in the gap, it is difficult to obtain sufficient tensile strength, and in any case, there is a drawback that sufficient adhesive strength cannot be obtained. ing. Note that FIG. 7 shows the case of the above method 3), in which reference numeral 21 denotes an axial groove of the flange, and 22 denotes a circumferential groove of the flange. Such weak adhesive strength of the flange means that the flange may come off when the electrophotographic photosensitive member with the flange is attached to the image forming apparatus, and actually comes off. In this case, a trouble such as an image disturbance due to shake or torque fluctuation may be induced.

Therefore, the present invention has been made for the purpose of solving the above-mentioned drawbacks of the prior art. That is, an object of the present invention is to provide an electrophotographic photosensitive member with a flange, in which the flange is firmly bonded with sufficient adhesive strength without deformation at the open end of the cylindrical hollow substrate.

[0005]

DISCLOSURE OF THE INVENTION As a result of investigations, the present inventors have found that in a flange to be joined by a conventional bonding method,
It has been found that the problem in the above-mentioned conventional technique can be solved by providing a hole in the groove through which the adhesive flows, that is, the adhesive groove, and the present invention has been completed. That is, the present invention provides a flanged electrophotographic photosensitive member obtained by fitting and adhering a flange to the open end of an electrophotographic photosensitive member having a photosensitive layer provided on a cylindrical hollow substrate having an open end. An adhesive groove is provided on the fitting surface with the cylindrical hollow base material, and a hole is provided in the adhesive groove.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view for explaining an electrophotographic photosensitive member of the present invention, in which 1 is a cylindrical hollow substrate having a photosensitive layer on its surface, and 2 (2A and 2B) are flanges. Then, it is fitted into the open end of the cylindrical hollow base material (from the direction of the arrow) and fixed by adhesive with the adhesive 3 to complete the flanged electrophotographic body. Although FIG. 1 shows the case where flanges are provided at both ends of the cylindrical hollow base material, they may be provided at only one side.

In the present invention, as the cylindrical hollow substrate 1, any cylindrical one can be used, such as aluminum and its alloys, iron and its alloys, and plastics. The photosensitive layer provided on the cylindrical hollow substrate is not particularly limited, and any one can be used.

The flange 2 may be made of any material, and for example, a plastic material is preferably used. In the present invention, the fitting portion of the flange is provided with an adhesive groove 21 in the axial direction of the flange and an adhesive groove 22 in the circumferential direction, as shown in FIG.
Then, the bonding groove 22 is provided with the hole 6. In addition,
The hole 6 may be one, but it is preferable to provide a plurality of holes. Further, it is desirable that the holes are provided in the bonding groove in the circumferential direction. Further, the hole needs to be deeper than the bonding groove, but the depth is preferably 0.5 mm or more and may not be penetrated.

When the above-mentioned flange is fitted into the open end of the cylindrical hollow base material whose inner wall near the open end is coated with the adhesive, the adhesive flows into the adhesive groove, in which case a hole is provided in the adhesive groove. Therefore, the adhesive can sufficiently enter the adhesive groove. Especially when the hole penetrates, the air in the adhesive groove is discharged from the hole to the inside of the cylindrical hollow substrate, so that the adhesive can sufficiently enter into the adhesive groove, and therefore the adhesion is strong. To be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 2 to 4 show the flange 2 (2A of FIG.
2B) is a cross-sectional view of a main part, FIG. 2 is a vertical cross-sectional view, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is BB of FIG.
It is a line sectional view.

An aluminum alloy A1050 defined in JIS was prepared as a cylindrical hollow base material 1, and a billet was hot extruded / cold drawn / outer diameter cut to have an outer diameter of 84 mmφ. Inner diameter 82 mmφ, length 3
A 40 mm aluminum pipe was used.

A photosensitive layer was formed on the aluminum pipe manufactured as described above. The production of the photosensitive layer is not directly involved in the present invention, and thus detailed description thereof will be omitted.
It was formed using the method described in JP-A-2-37358. That is, after the surface of the aluminum pipe is roughened by honing, it is sequentially dip-coated with a charge generating layer forming coating solution containing phthalocyanine and a charge transporting layer forming coating solution containing a benzidine compound and a polycarbonate resin. Then, the charge generation layer and the charge transport layer were formed.

On the other hand, the material of the flange is
ABS resin + Tismo (OS-30B, Otsuka Chemical Co., Ltd.)
Was used, which was molded by injection molding. This flange has a structure shown in FIGS. 2 to 4, and the fitting portion with the aluminum pipe is
There are four adhesive grooves 21 in the axial direction and one adhesive groove 22 in the circumferential direction.
This is provided in total, and four holes 6 are provided in the bonding groove 22. The outer diameter (d in FIG. 2) of the fitting portion of the flange with the aluminum pipe is 82 mmφ.
The adhesive groove had a groove width of 2 mm and a groove depth of 0.5 mm.

As shown in FIG. 1, an epoxy adhesive (EP007, manufactured by Cemedine Co., Ltd.) is applied to the inner wall portion near both open ends of the aluminum pipe provided with the above-mentioned photosensitive layer.
Was applied in an appropriate amount, and the above-mentioned flange was fitted from both open ends and sufficiently cured to obtain a flanged electrophotographic photoreceptor. When the tensile strength of the flange in this electrophotographic photosensitive member with a flange was measured, the average of five was 1715.
It was N (175 kgf). This value shows that it has sufficient adhesive strength.

Further, when the state of the adhesive in the adhesive groove of the flange removed from the electrophotographic photosensitive member with the flange was observed, it was confirmed that the adhesive penetrated the entire area of the adhesive groove. In that case, that is, in FIG.
5 and 6 show a state where the adhesive has entered the adhesive groove in FIG. In the figure, 3a is a hardened adhesive, which indicates that the entire area of the circumferential bonding groove is filled with the hardened adhesive and that it has also entered part of the hole.

For comparison, a flange was manufactured in exactly the same manner as above except that the hole 6 was not provided. 10 to 12 are cross-sectional views of the main part of the flange of the comparative example, and have the same structure as that shown in FIGS. 2 to 4 except that no hole is provided.

As shown in FIG. 7, an appropriate amount of epoxy adhesive (EP007, manufactured by Cemedine Co., Ltd.) is applied to the inner wall portion near the open ends of the aluminum pipe provided with the photosensitive layer in the same manner as above. The flange was fitted in from both open ends and sufficiently cured to obtain a flanged electrophotographic photoreceptor. When the tensile strength of the flange in this electrophotographic photosensitive member with a flange was measured, the average of 5 was 7
It was 84 N (80 kgf).

Observation of the state of the adhesive in the adhesive groove of the flange removed from the electrophotographic photosensitive member with the flange revealed that the adhesive entered the circumferential groove only in the vicinity of the axial adhesive groove. There wasn't. The state in that case, that is, the state where the adhesive has entered the adhesive groove in FIGS. 11 and 12 is shown in FIGS. 13 and 14.

[0019]

Since the flanged electrophotographic photoreceptor of the present invention is provided with an adhesive groove having a hole in the flange, the flange has a sufficient adhesive strength without deformation at the open end of the cylindrical hollow substrate. It has been firmly joined with.

[Brief description of drawings]

FIG. 1 is a partially fragmented perspective view for explaining an electrophotographic photosensitive member with a flange of the present invention.

FIG. 2 is a vertical sectional view of a main part of a flange used in the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

5 is a diagram showing a state where an adhesive has flowed into an adhesive groove of the flange of FIG. 3 and has been cured.

FIG. 6 is a view showing a state where an adhesive has flown into an adhesive groove of the flange of FIG. 4 and has been cured.

FIG. 7 is a partially crushed perspective view for explaining a flanged electrophotographic photosensitive member according to a conventional technique.

FIG. 8 is a cross-sectional view of a main part of a flanged electrophotographic photosensitive member joined by one of the conventional joining methods.

FIG. 9 is a sectional view of a flanged electrophotographic photosensitive member joined by another one of the conventional joining methods.

FIG. 10 is a vertical cross-sectional view of a main part of a flange used in a comparative example.

FIG. 11 is a sectional view taken along line CC of FIG. 10;

12 is a cross-sectional view taken along the line DD of FIG.

FIG. 13 is a diagram showing a state where an adhesive has flown into the adhesive groove of the flange of FIG. 11 and has been cured.

FIG. 14 is a diagram showing a state in which an adhesive has flown into the adhesive groove in the flange of FIG. 12 and has been cured.

[Explanation of symbols]

1 ... Cylindrical hollow base material, 2, 2A, 2B ... Flange, 21
... axial bonding groove, 22 ... circumferential bonding groove, 3 ... adhesive, 3a ... cured adhesive, 4 ... nut, 5 ... stay,
6 ... hole.

Claims (1)

[Claims] 1. A flanged electrophotographic photoreceptor comprising a cylindrical hollow substrate having an open end and a photosensitive layer provided on a hollow hollow base material, wherein a flange is fitted and adhered to the open end. An electrophotographic photosensitive member with a flange, characterized in that an adhesive groove is provided on a fitting surface with a cylindrical hollow base material, and a hole is provided in the adhesive groove.