JP2000267312A - Production of photoreceptor drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to remove a photosensitive agent from the inside surface at the bottom end of a photoreceptor drum without contaminating the outside surface of the photoreceptor drum with a treating liquid. SOLUTION: This process for production consists in immersing the one end of the photoreceptor drum 1 formed by applying the photosensitive agent on a tube stock by immersing method into a vessel 4 of the treating liquid 3 consisting of a solvent dissolving the photosensitive agent and concentrically inserting, in this state, a rotating body 5 flocked with brushes on its peripheral surface into the photoreceptor drum 1 and rotating, thereby removing the photosensitive agent on the inside surface at the bottom end of the photoreceptor drum 1 with the brushes 7. The peripheral surface of the rotating body 5 of this case is provided with regions 8B not flocked with the brushes laterally parting the flocking area 8A of the brushes 7. As a result, the solvent vapor evaporated at the bottom end in the photoreceptor drum 1 is made to escape to the upper part by the regions 8B not flocked with the brushes on the peripheral surface of the rotating body and, therefore, the increase in the internal pressure at the bottom end of the photoreceptor drum by filling of the solvent vapor may be averted. Consequently, the contaminating of the outside surface of the photoreceptor drum 1 with the treating liquid 3 in consequence of the air bubbles generated by the internal pressure increase at the bottom end of the photoreceptor drum 1 may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a photosensitive drum for removing a photosensitive agent from an inner surface of one end of a photosensitive drum formed by applying a photosensitive agent to a base tube by an immersion method.

[0002]

2. Description of the Related Art A photosensitive drum used in an electrophotographic copying machine is formed by applying a photosensitive agent to the surface of a base tube. There are various methods for applying a photosensitive agent to a base tube, and an immersion method that is advantageous in terms of productivity, cost, and the like is generally widely used.
In this immersion method, a raw tube in a vertical position, with one end held by a jig, is immersed in a liquid tank of a sensitizer dissolved in a solvent, and then pulled up at a constant speed. Is applied.

Incidentally, since both ends of the photosensitive drum are portions where various members are in sliding contact with each other in a state where the photosensitive drum is incorporated in an electrophotographic copying machine, it is preferable that both ends are portions where no photosensitive agent is applied. On the other hand, in the case of the photosensitive drum coated with the photosensitive agent by the immersion method, the photosensitive agent is also applied to the lower end portion and the inner surface where the application is unnecessary. Therefore, in the case of the photosensitive drum coated with the photosensitive agent by the immersion method, it is necessary to remove the photosensitive agent from the inner and outer surfaces at one end.

As an example of a method of removing the photosensitive agent from the inner surface of one end of the photosensitive drum in the removal process, as shown in FIG. 2, a processing solution 31 composed of a solvent that dissolves the photosensitive agent is used.
In a state where one end of the photosensitive drum 33 is immersed in the tank 32, a rotating body 35 in which a brush 34 is implanted on the entire peripheral surface is concentrically inserted into the photosensitive drum 33 and rotated. Brush 3 with the photosensitive agent on the inner surface of the lower end of body drum 33
4 is known.

[0005]

However, in the above-mentioned conventional method, since the brush 34 is planted on the entire peripheral surface of the rotating body 35, the inside of the photosensitive drum 33 is separated from the upper portion by the brush 34 in an airtight manner. The solvent vapor is filled at the lower end of the photosensitive drum 33, and the pressure rises, and the bubbles 36 generated at the lower end are popped on the surface of the processing liquid 31, so that the outer surface of the photosensitive drum 33 above the surface of the processing liquid 31 The treatment liquid 31
There is a problem that the photosensitive agent in a portion that should not be removed is removed.

In view of the above-mentioned conventional drawbacks, the present invention has been made in view of the above circumstances and has solved the above-mentioned problems. It is an object of the present invention to provide a method for producing the same.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method in which one end of a photosensitive drum formed by applying a photosensitive agent to a raw tube by an immersion method is made of a solvent which dissolves the photosensitive agent. In a state of being immersed in a bath of the processing liquid, a rotating body having a brush planted on the peripheral surface is concentrically inserted into the photosensitive drum and rotated to remove the photosensitive agent on the inner surface of the lower end of the photosensitive drum. A method for manufacturing a photoreceptor drum to be removed with a brush, characterized in that a brush non-flocked area is provided on a peripheral surface of the rotating body to divide the flocked area of the brush into left and right. According to this configuration, the solvent vapor evaporated at the lower end of the photoconductor drum flows upward due to the non-flocked area of the brush on the peripheral surface of the rotating body, so that the internal pressure of the lower end of the photoconductor drum increases due to the filling of the solvent vapor. Can be avoided, and it is possible to prevent the outer surface of the photosensitive drum from being stained with the processing liquid due to bubbles generated by an increase in the internal pressure.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram of a method for manufacturing the photosensitive drum of this embodiment. In the figure, a photosensitive drum 1 is obtained by applying a photosensitive agent to a base tube by an immersion method, and a predetermined width portion from one end is a non-applied portion where the photosensitive agent is not applied during the immersion process. The other end has been coated with a photosensitive agent.

The photosensitive drum 1 is suspended in a vertical position by a holder 2 with its non-coated portion facing upward, and a predetermined width of a lower end portion for removing the photosensitive agent is an organic carbonized material for dissolving the photosensitive agent. It is immersed in a processing liquid tank 4 containing a processing liquid 3 made of a hydrogen solvent (for example, tetrahydrofuran (THF)). At the center of the processing liquid tank 4, a columnar rotating body 5 having a vertical axis is disposed, and is driven to rotate by a rotating mechanism 6. The outer peripheral surface of the rotating body 5 has a surface area 8A where the brush 7 is implanted and a surface area 8B where the brush 7 is not implanted, and the brush non-implantation area 8B is vertically moved so as to divide the brush implantation area 8A left and right. It is formed facing the direction.

When the photosensitive drum 1 is immersed in the processing liquid 3, the photosensitive drum 1 is set in a state in which the rotating body 5 is concentrically inserted into the lower end thereof. In this state, the length of the brush 7 is set so that the brush 7 of the rotating body 5 slides on the inner surface of the photosensitive drum 1. A rotating mechanism 6 for rotatingly driving the rotating body 5 includes an input gear 9 provided on a shaft portion 5 a of the rotating body 5 penetrating the bottom of the processing liquid tank 4;
It comprises a motor 10 as a drive source and an output gear 11 for transmitting the rotation output of the motor 10 to the input gear 9.
A sealing material 12 is inserted into a shaft penetration portion at the bottom of the processing liquid tank 4. Thereby, the shaft penetrating portion is sealed, and the shaft portion 5 a of the rotating body 5 can be rotated with respect to the processing liquid tank 4.

Under the condition that the photosensitive drum 1 is immersed,
When the rotating mechanism 6 is operated to rotate the rotating body 5, the photosensitive agent on the inner surface at the lower end of the photosensitive drum 1 immersed and dissolved in the processing liquid 3 made of a solvent is scraped off by the brush 7. At this time, since the lower end and the upper part in the photosensitive drum 1 can be ventilated by the brush non-flocked area 8B on the peripheral surface of the rotating body 5, the processing liquid 3 is removed from the lower end in the photosensitive drum 1. The evaporated solvent vapor can be released to the upper portion, and it is possible to avoid an increase in the internal pressure at the lower end of the photosensitive drum due to the filling of the solvent vapor. As a result, it is possible to prevent the outer surface of the photosensitive drum 1 from being stained with the processing liquid 3 due to bubbles generated by an increase in the internal pressure as in the case of the conventional example.

[0012]

The present invention is configured as described above.
Solvent vapor evaporated at the lower end of the photoconductor drum can be released to the upper part by the brush non-flocked area on the rotating body peripheral surface,
It is possible to avoid an increase in the internal pressure at the lower end of the photoconductor drum due to the filling of the solvent vapor, and it is possible to prevent the outer surface of the photoconductor drum from being stained with the processing liquid due to bubbles generated by the increase in the internal pressure.

[Brief description of the drawings]

FIG. 1A is a schematic diagram illustrating a configuration of a method for manufacturing a photosensitive drum according to an embodiment of the present invention, and FIG.
FIG.

FIG. 2A is a schematic diagram showing a configuration of a conventional example, and FIG. 2B is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Photoreceptor drum, 3 ... Processing liquid, 4 ... Processing liquid tank, 5 ... Rotating body, 7 ... Brush, 8A ... Brush flocking area, 8B ... Brush non-planting area

Claims (1)

[Claims] 1. A brush is provided on a peripheral surface of a photosensitive drum formed by applying a photosensitive agent to a base tube by an immersion method in a state in which the photosensitive drum is immersed in a processing liquid bath containing a solvent that dissolves the photosensitive agent. A method of manufacturing a photosensitive drum, comprising removing a photosensitive agent from the inner surface of a lower end portion of the photosensitive drum with a brush by inserting a rotating body having a hair implanted concentrically into the photosensitive drum and rotating the rotating body. A method for manufacturing a photoreceptor drum, wherein a brush non-flocked area is provided on a peripheral surface of the body to divide the flocked area of the brush into right and left.