JP3465082B2 - Electrophotographic photoreceptor manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoconductor manufacturing apparatus, and more specifically, it holds an inner side of a cylindrical substrate with an expandable / contractible elastic body and immerses it in a coating solution. The present invention relates to an apparatus for manufacturing an electrophotographic photosensitive member, which coats the coating liquid on the outer peripheral surface of the.

[0002]

2. Description of the Related Art An expandable / contractible elastic body is filled with a pressurized gas (or a pressurized liquid) and expanded to hold the inside of a cylindrical substrate and immerse it in a coating solution to form an electrophotographic photoreceptor. When manufacturing, in order to manufacture an electrophotographic photosensitive member that can obtain a high-quality image without image unevenness or scumming, the pressurized gas inside the elastic body is a lower space in the cylindrical substrate or a cylindrical shape. It is necessary that the material does not leak to the upper portion of the base body and that the elastic body is in close contact with the inner surface of the cylindrical base body to maintain a good sealing state.

By the way, regarding the above-mentioned dip coating apparatus,
For example, Japanese Examined Patent Publication No. 4-4034 and Japanese Patent Laid-Open No. 63-
Japanese Patent No. 315167 and Japanese Patent Application Laid-Open No. 61-25660 disclose an apparatus for expanding a bag-shaped rubber to hold a cylindrical body (base) and dip-coating an electrophotographic photoreceptor.

The devices (1) and (2) are intended to prevent the coating liquid from entering the inside of the cylindrical body by adjusting the pressure and to prevent the bubbles from being discharged from the inside of the cylindrical body to the coating liquid.
The device of (1) is intended to prevent the coating liquid from entering the inside of the tubular body by adjusting the pressure.

As described above, although the apparatus described in the above publication aims at adjusting the pressure inside the base body, the shape and structure of the elastic body for holding the base body is rubber bag, rubber film, rubber tube, rubber packing. There is only a brief description of members such as, but no detailed reference is found.

[0006]

However, when holding a cylindrical substrate (including a seamless belt substrate),
Since pressurized gas or pressurized liquid is injected into the elastic body to expand it, gas or liquid may leak if the sealed state of the elastic body is incomplete. If it is not fixed, there is a problem that the end portion may be stretched or cut.

For example, when gas leaks into the coating liquid through the lower space in the substrate during dip coating, air bubbles adhere to the coating film, resulting in an image defect, and when the liquid leaks. Causes problems such as agglomeration of the coating liquid and precipitation of solids. Further, there is a possibility that charging characteristics and sensitivity may be deteriorated due to contamination of leaked gas or liquid. Further, if gas or liquid leaks from the base portion that is not dipped in the coating liquid, the undried coating film may be disturbed or "repellency" may occur, which causes image unevenness.

The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to make the sealed state of the elastic body and the attached state of both ends thereof to be accurate, and It is an object of the present invention to provide an electrophotographic photosensitive member which can be used as a dip coating device capable of preventing troubles in advance and which can provide a high quality image without image unevenness or background stain.

[0009]

An apparatus for producing an electrophotographic photosensitive member according to a first aspect of the present invention is configured such that an elastic body capable of expanding and contracting holds an inner side of a cylindrical substrate and immerses it in a coating liquid to form a cylindrical shape. In an electrophotographic photosensitive member manufacturing apparatus for coating a coating liquid on an outer peripheral surface of a substrate, the elastic body is covered with a bottomed hollow body having a fluid supply / discharge port on an upper portion and an opening on a peripheral wall. The upper end and the lower end are fixed to the bottomed hollow body in a state of being fastened by a fixing member, and the elastic body has a sealed structure.

According to a second aspect of the present invention, in the apparatus for manufacturing an electrophotographic photosensitive member according to the first aspect, the elastic body is a bottomed cylindrical body, and a circular flange is concentrically provided at an upper end portion. It is characterized in that a circular nozzle is concentrically provided at the center of the bottom plate and projects downward.

According to a third aspect of the present invention, in the apparatus for producing an electrophotographic photosensitive member, the elastic body is made of natural rubber, synthetic rubber or thermoplastic elastomer, and the circular flange and the circular nozzle are integrally molded. It is characterized by being.

According to a fourth aspect of the present invention, in the apparatus for manufacturing an electrophotographic photosensitive member according to the second or third aspect, the bottomed hollow body is provided with a circular top plate formed with the fluid supply / discharge port and a screw on the outer peripheral surface. Provided, by screwing a ring-shaped fixing member having a screw formed on the inner peripheral surface to the circular top plate, the circular flange of the elastic body,
It is characterized in that it is sandwiched and fixed by these circular top plates and ring-shaped fixing members.

According to a fifth aspect of the present invention, in the apparatus for manufacturing an electrophotographic photosensitive member according to the second, third or fourth aspect, a screw hole is provided in the center of the bottom plate of the bottomed hollow body, and a screw is formed on the outer peripheral surface of the upper end portion. The lower fixing member is screwed into the screw hole, and the circular nozzle of the elastic body is sandwiched and fixed by the bottom plate and the lower fixing member.

According to a sixth aspect of the present invention, in the apparatus for manufacturing an electrophotographic photosensitive member, the circular top plate of the hollow body with a bottom, the inside of the hollow body with a bottom and the lower fixing member are exhausted. A pipe is provided, and a pressure adjusting valve is provided in the exhaust pipe.

According to a seventh aspect of the present invention, there is provided an apparatus for manufacturing an electrophotographic photosensitive member, wherein between the upper end of the elastic body and the fixing member, and the lower end of the elastic body and the fixing member. A ring-shaped member is inserted between them.

[0016]

In the electrophotographic photosensitive member manufacturing apparatus according to the first aspect, since the upper and lower ends of the elastic body act as packings for the seal, the pressurized fluid in the elastic body is present when the coating liquid is applied. There is no leakage to the outside from the attachment part to the bottom hollow body.

In the electrophotographic photosensitive member manufacturing apparatus according to the second aspect of the present invention, the circular flange and the circular nozzle function as a packing by being deformed by being clamped by the fixing member.

In the electrophotographic photosensitive member manufacturing apparatus according to the third aspect, the molding process of the elastic body is simplified and the mechanical strength of the elastic body is improved.

In the apparatus for manufacturing an electrophotographic photosensitive member according to the fourth and fifth aspects, the structure for attaching the elastic body to the hollow body with a bottom becomes simple, and the attaching work can be performed easily.

In the electrophotographic photosensitive member manufacturing apparatus according to the present invention, the operating pressure of the pressure regulating valve is set to a predetermined value. Then, when the pressure of the lower space in the base body exceeds a predetermined value, the pressure regulating valve is automatically opened to release gas,
The pressure in the lower space is maintained below a predetermined value.

In the electrophotographic photosensitive member manufacturing apparatus according to the seventh aspect, the sealing action at the upper and lower ends of the elastic body is improved by inserting the ring-shaped member.

The construction of the electrophotographic photosensitive member manufacturing apparatus of the present invention will be described below in detail with reference to the drawings. 1 is a vertical cross-sectional view of this manufacturing apparatus, showing a coating liquid coating step, FIG. 2 is a perspective view of an elastic body 9, FIG. 3 is a vertical cross-sectional view thereof, and FIG. FIG. 5 is a sectional view showing a mounted state, and FIG. 5 is a longitudinal sectional view showing a state in which the ring-shaped members 24 and 25 are inserted and arranged in this manufacturing apparatus.

As shown in FIGS. 1 to 4, a cylindrical hollow body (rod) 1 having a bottom is provided on a support rod 2, and the support rod 2 is provided vertically and is rotatable by a drive motor 3 for raising and lowering. Screw it onto the screw rod 4. The bottomed hollow body 1 is provided with a circular top plate 6 having a screw 5 formed on the outer peripheral surface thereof, an opening 7 in the peripheral wall, and a screw hole 8 in the center of the bottom plate.

The elastic body 9 is made of natural rubber, synthetic rubber or thermoplastic elastomer to form a cylindrical body with a bottom. As shown in FIGS. 2 and 3, a circular flange 10 is concentrically provided at the upper end portion of the bottom plate. The circular nozzle 11 is provided concentrically and protruding downward. In this case, the circular flange 10
The circular nozzle 11 is preferably formed integrally with the cylindrical portion.

Fixing members for fixing the elastic body 9 to the bottomed hollow body 1 are detachably attached to the upper and lower ends of the bottomed hollow body 1. That is, as shown in FIG. 4, as a member for fixing the circular flange 10 of the elastic body 9, a ring-shaped fixing member (upper expansion limiting jig) 13 having a screw 12 formed on the inner peripheral surface thereof is used. For fixing the circular nozzle 11 of No. 9, lower fixing members (lower expansion limiting jigs) 15 each having a screw 14 formed on the outer peripheral surface of the upper end are prepared, and the ring-shaped fixing member 13 is the circular top plate. To 6,
The lower fixing members 15 can be screwed into the screw holes 8, respectively.

In this case, the circular flange 10 is formed by forming the step 16 on the inner surface side of the ring-shaped fixing member 13.
The clamping and fixing of will be made more reliable. Further, the lower fixing member 15 has an upper half portion formed into a cylindrical body and a lower half portion formed into an inverted conical body, and the circular nozzle 1 is formed at the base portion of the cylindrical body.
The annular groove 17 corresponding to the shape of No. 1 is formed, so that the clamping and fixing of the circular nozzle 11 can be made simpler and more reliable.

Further, as shown in FIGS. 1 and 4, a fluid supply / discharge pipe 18 is connected to the circular top plate 6 of the bottomed hollow body 1 to communicate with the inside of the bottomed hollow body 1, and the fluid supply / discharge pipe 18 is provided. Is connected to a source of compressed air (not shown). Further, an exhaust pipe (pressure adjusting pipe) 19 is provided penetrating the circular top plate 6, the inside of the bottomed hollow body 1 and the lower fixing member 15, and the exhaust pipe 19 is provided with a pressure adjusting valve 20 acting as a relief valve. . In FIG. 1, 21 is a substrate (photosensitive drum), 22 is a coating liquid storage tank (cylinder), and 23 is a coating liquid.

Next, the operation of the above manufacturing apparatus, that is, the step of applying the coating liquid 23 by this manufacturing apparatus will be described.

First, as shown in FIG. 4, the elastic body 9 is covered on the cylindrical portion of the bottomed hollow body 1, and then the ring-shaped fixing member 13 is screwed onto the circular top plate 6 to form the circular flange 10. It is clamped and fixed, then the lower fixing member 15 is tightly inserted into the lower end of the exhaust pipe 19, and the columnar portion is fixed to the bottomed hollow body 1.
The circular nozzle 11 is screwed into the screw hole 8 of the bottom plate.
Pinch and fix.

In this case, the lower fixing member 15 and the exhaust pipe 19
If there is a gap between the lower end and the lower end, the pressurized gas inside the elastic body 9 may leak from the lower end of the lower fixing member 15 to the lower inside of the base body 21 in the coating process. It is necessary. Alternatively, the lower fixing member 15 may be screwed onto the lower end of the exhaust pipe 19 (in this case, a sealing tape may be wrapped around the lower end) in order to eliminate this gap.

By sandwiching and fixing in this way, the circular flange 10 and the circular nozzle 11 act as packing for sealing, so that the pressurized gas leaks from the upper end of the elastic body 9 to the outside air or the lower end of the base body. 21. There is no fear of leaking to the inside of the lower part 21, and abnormal deformation of the elastic body 9 at the time of expansion can be prevented.

At the start of coating, the elevating screw rod 4 is rotated to insert the bottomed hollow body 1 in the state shown in FIG. 4 partway into the substrate 21, and then compressed air is supplied through the fluid supply / exhaust pipe 18. By supplying and expanding the elastic body 9,
(1) Adhere closely to the inner surface and hold it vertically. Then, the bottomed hollow body 1 is vertically lowered and immersed in the coating liquid 23 to a predetermined depth, and then the base 21 is raised to complete the coating.

In this dipping step, since the elastic body 9 is hermetically attached to the bottomed hollow body 1, the base body 21 made of the elastic body 9 is used.
And the compressed air does not leak from the upper end of the elastic body 9 to the outside air or leaks from the lower end to the lower space 31 in the base 21.

Further, the pressure of the air trapped in the lower space 31 is adjusted to a predetermined value or less by opening the pressure adjusting valve 20 in response to the pressure increase in the lower space 31 due to the evaporation of the solvent from the coating liquid 23. Therefore, bubbles are not released from the lower space 31 into the coating liquid 23.

In FIG. 5, in order to further improve the structure shown in FIG. 4, a ring-shaped member 24 is provided between the circular flange 10 of the elastic body 9 and the ring-shaped fixing member 13, and the circular nozzle 11 of the elastic body 9 and the lower portion thereof. A ring-shaped member 25 is provided between the fixing members 15,
Each is inserted and deployed. In this case, the shapes of the ring-shaped fixing member 13 and the lower fixing member 15 correspond to the shapes of the ring-shaped members 24 and 25. With this structure, the sealing performance of the circular flange 10 and the circular nozzle 11 is further improved, so that the effect of preventing pressurized gas from leaking from the elastic body 9 and the effect of preventing abnormal deformation of the elastic body 9 are further excellent. There are advantages.

[0036]

[Intermediate layer coating liquid]

  Soluble nylon (Toray: Amilan CM-8000) 5 parts by weight   95 parts by weight of methanol The above was mixed and dissolved to obtain a coating liquid. [Charge generation layer coating liquid]   Butyral resin (Sekisui Chemical: S-REC BLS) 5 parts by weight   Cyclohexanone 150 parts by weight The above is mixed and dissolved, and the structural formula of the following [Chemical formula 1]

[0037]

[Chemical 1]

10 parts by weight of the trisazo pigment having was added and dispersed by a ball mill for 48 hours. Further, 210 parts by weight of cyclohexanone was added and dispersed for 3 hours. This dispersion was diluted with cyclohexanone with stirring to adjust the solid content to 1.5 wt%. [Charge Transport Layer Coating Liquid] Polycarbonate (Teijin: Panlite C-1400) 10 parts by weight Charge transfer agent having a structural formula of the following [Chemical Formula 2] 9 parts by weight Tetrahydrofuran 81 parts by weight A charge transport layer coating liquid is prepared by the above composition. did.

[0039]

[Chemical 2]

An intermediate layer, a charge generation layer, and a charge transport layer were applied in this order while holding the substrate by the dip coating apparatus of FIG. 1 in which an elastic body was attached using the fixing member. In this case, compressed air having a pressure of 0.5 kgf / cm ² was used to expand the elastic body. The intermediate layer coating solution is applied at a temperature of 20 ° C.
The coating was dried after coating in an environment of relative humidity of 60% to form an intermediate layer having a film thickness of 1 μm. The coating of the charge generation layer coating liquid was performed in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after coating, the coating film was dried to form a charge generation layer having a thickness of 0.2 μm. The charge transport layer coating liquid is applied at a temperature of 20 ° C. and a relative humidity of 4
Performed in 0% environment, and after coating the coating is dried to a film thickness of 20μ
m charge transport layer was formed.

[Table 1] shows the presence or absence of air leakage during coating, the film forming properties of the intermediate layer, the charge generating layer and the charge transporting layer, and the image quality of the electrophotographic photosensitive member obtained. No brushing occurred during the coating of the charge transport layer.

[0042]

[Table 1]

Separately, the substrate is held by the dip coating apparatus of FIG. 1 in which an elastic body is mounted using the fixing member, and the intermediate layer and the charge generation layer are formed under the same procedure, environmental conditions and film thickness as those of the substrate. Then, the charge transport layer was applied in that order. In this case, the pressure to expand the elastic body is 1.5 kgf / cm.
² compressed air was used.

[Table 1] shows the presence or absence of air leakage during coating, the film forming properties of each of the intermediate layer, the charge generating layer and the charge transporting layer, and the image quality of the obtained electrophotographic photosensitive member. No brushing occurred during the coating of the charge transport layer.

Comparative Example 1 [Substrate used] A having an inner diameter of 59 mm, a length of 300 mm and a thickness of 0.5 mm
l Drum inner diameter 60 mm, length 300 mm, thickness 40 μm Ni
Seamless belt [elastic body used] Natural rubber outer diameter 53 mm, length 50 mm, thickness 1 mm, outer diameter 57 mm, length 300 mm, thickness 3 mm urethane rubber The above elastic body was molded into the shape shown in FIGS. (Neither circular flange nor circular nozzle is provided). [Fixing member] An Al molded into the shape shown in FIG. 4 was used. The intermediate layer coating liquid, the charge generation layer coating liquid and the charge transport layer coating liquid used were the same as in Example 1.

An intermediate layer, a charge generation layer, and a charge transport layer were applied in this order while holding the substrate by the dip coating apparatus of FIG. 1 in which an elastic body was mounted using the fixing member. In this case, compressed air having a pressure of 0.5 kgf / cm ² was used to expand the elastic body. The intermediate layer coating solution is applied at a temperature of 20 ° C.
The coating was dried after coating in an environment of relative humidity of 60% to form an intermediate layer having a film thickness of 1 μm. The coating of the charge generation layer coating liquid was performed in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after coating, the coating film was dried to form a charge generation layer having a thickness of 0.2 μm. The charge transport layer coating liquid is applied at a temperature of 20 ° C. and a relative humidity of 4
Performed in 0% environment, and after coating the coating is dried to a film thickness of 20μ
m charge transport layer was formed.

Table 2 shows the presence / absence of air leakage during coating, the film forming properties of the intermediate layer / charge generating layer / charge transporting layer, and the image quality of the electrophotographic photosensitive member obtained. No brushing occurred during the coating of the charge transport layer.

[0048]

[Table 2]

Similarly, the substrate is held by the dip coating apparatus of FIG. 1 in which an elastic body is mounted using the fixing member, and the intermediate layer and the charge are applied under the same procedure, environmental conditions and film thickness as those of the substrate. The generation layer and the charge transport layer were applied in this order. In this case, a pressure of 1.5 kgf / c is required to expand the elastic body.
m ² of compressed air was used. [Table 2] shows the presence / absence of air leakage during coating, the film forming properties of each of the intermediate layer, charge generation layer and charge transport layer, and the image quality of the obtained electrophotographic photoreceptor.
Shown in. No brushing occurred during the coating of the charge transport layer.

Example 2 [Substrate used] Ni drum having an inner diameter of 78 mm, a length of 300 mm and a thickness of 1 mm, an Al drum having an inner diameter of 80 mm, a length of 300 mm and a thickness of 40 μm.
Seamless belt [elastic body used] 53 mm outer diameter, 50 mm length, 1 mm thick natural rubber outer diameter 57 mm, 300 mm length, 3 mm thick urethane rubber The above elastic body was molded into the shape shown in FIGS. . [Fixing member] An Al molded into the shape shown in FIG. 5 was used. [Ring-shaped member] The ring-shaped member shown in FIG. 5 was used. The intermediate layer coating liquid, the charge generation layer coating liquid and the charge transport layer coating liquid used were the same as in Example 1.

An intermediate layer, a charge generation layer, and a charge transport layer were applied in this order while holding the substrate by the dip coating apparatus of FIG. 1 in which an elastic body was mounted using the fixing member and the ring-shaped member. In this case, compressed air was used to expand the elastic body. The coating of the intermediate layer coating liquid is performed in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after coating, the coating film is dried to a film thickness of 1 μm.
m intermediate layer was formed. The coating of the charge generation layer coating liquid was performed in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after coating, the coating film was dried to form a charge generation layer having a thickness of 0.2 μm. The application of the charge transport layer coating liquid was performed in an environment of a temperature of 20 ° C. and a relative humidity of 40%, and after coating, the coating film was dried to form a charge transport layer having a film thickness of 20 μm. [Table 3] shows the pressure of the compressed air used, the presence or absence of air leakage during coating, the film forming properties of each of the intermediate layer, charge generation layer, and charge transport layer, and the image quality of the obtained electrophotographic photosensitive member. . No brushing occurred during the coating of the charge transport layer.

[0052]

[Table 3]

Similarly, a substrate is held by the dip coating apparatus of FIG. 1 in which an elastic body is mounted using the fixing member and the ring-shaped member, and the same procedure, environmental conditions and film thickness as those for the substrate are used. The intermediate layer, the charge generation layer and the charge transport layer were applied in this order. In this case, compressed air was used to expand the elastic body. Table 3 shows the pressure of compressed air, the presence or absence of air leakage during coating, the film forming properties of each of the intermediate layer, the charge generation layer, and the charge transport layer, and the image quality of the obtained electrophotographic photosensitive member. No brushing occurred during the coating of the charge transport layer.

Comparative Example 2 [Substrate used] Ni drum having an inner diameter of 78 mm, a length of 300 mm and a thickness of 1 mm, an Al drum having an inner diameter of 80 mm, a length of 300 mm and a thickness of 40 μm.
Seamless belt [Elastic body used] An outer diameter of 49 mm, a length of 50 mm, a thickness of 1 mm, a natural rubber outer diameter of 51 mm, a length of 300 mm, and a thickness of 3 mm of urethane rubber The elastic body was molded into the shape shown in FIGS. . [Fixing member] An Al molded into the shape shown in FIG. 4 was used. [Ring-shaped member] Not used. The intermediate layer coating liquid, the charge generation layer coating liquid and the charge transport layer coating liquid used were the same as in Example 1.

The substrate was held by the dip coating apparatus of FIG. 1 in which an elastic body was mounted using the fixing member, and the intermediate layer, the charge generating layer and the charge transporting layer were coated in that order. In this case, compressed air was used to expand the elastic body. The coating of the coating solution for the intermediate layer was performed in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after coating, the coating film was dried to form an intermediate layer having a film thickness of 1 μm. The charge generation layer coating solution is applied in an environment of a temperature of 20 ° C. and a relative humidity of 60%, and after the application, the coating film is dried to a film thickness of 0.
A 2 μm charge generation layer was formed. The application of the charge transport layer coating liquid was performed in an environment of a temperature of 20 ° C. and a relative humidity of 40%, and after coating, the coating film was dried to form a charge transport layer having a film thickness of 20 μm. [Table 4] shows the pressure of the compressed air used, the presence or absence of air leakage during coating, the film-forming properties of each of the intermediate layer, the charge generation layer, and the charge transport layer, and the image quality of the obtained electrophotographic photoreceptor. . No brushing occurred during the coating of the charge transport layer.

[0056]

[Table 4]

Similarly, the substrate is held by the dip coating apparatus of FIG. 1 in which an elastic body is mounted using the fixing member, and the intermediate layer and the charge are applied under the same procedure, environmental conditions and film thickness as those of the substrate. The generation layer and the charge transport layer were applied in this order. In this case, compressed air was used to expand the elastic body. [Table 4] shows the pressure of compressed air, the presence or absence of air leakage during coating, the film forming properties of each of the intermediate layer, the charge generating layer and the charge transporting layer, and the image quality of the obtained electrophotographic photosensitive member. No brushing occurred during the coating of the charge transport layer.

[0058]

As is apparent from the above description, claim 1
According to the electrophotographic photosensitive member manufacturing apparatus described in (1), since the upper and lower end portions of the elastic body act as packings for sealing, the pressurized fluid in the elastic body during application of the coating liquid is attached to the bottomed hollow body. Since it does not leak from the outer part to the outside, it is possible to form an intermediate layer, a charge generation layer and a charge transport layer with good film-forming properties, and it is possible to obtain high quality images without image unevenness or background stains. The body can be provided. Further, since the upper and lower ends of the elastic body are accurately fixed, there is an effect that the end of the elastic body does not have to be stretched or cut. According to the apparatus for manufacturing an electrophotographic photosensitive member described in claims 2, 3, 4, and 5, the structure for attaching the elastic body to the hollow body with a bottom becomes simple, and the attaching work can be performed easily. effective. According to the manufacturing apparatus of the electrophotographic photosensitive member of claim 6, since the pressure of the lower space in the substrate is maintained at a predetermined value or less, the gas in the lower space is discharged as bubbles to the coating liquid. No more
There is an effect that a higher quality electrophotographic photoreceptor can be provided. According to the electrophotographic photosensitive member manufacturing apparatus of claim 7, since the sealing action at the upper and lower ends of the elastic member is improved by inserting the ring-shaped member, it is possible to provide a higher quality electrophotographic photosensitive member. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an apparatus for manufacturing an electrophotographic photosensitive member according to the present invention, showing a coating liquid coating step.

FIG. 2 is a perspective view of an elastic body in FIG.

FIG. 3 is a vertical cross-sectional view of FIG.

4 is a cross-sectional view showing a mounted state of the elastic body in FIG.

FIG. 5 is a vertical cross-sectional view showing a mounted state of an elastic body when a ring-shaped member is inserted.

6 is a perspective view of an elastic body used in Comparative Example 1. FIG.

7 is a vertical cross-sectional view of FIG.

[Explanation of symbols]

1 Bottomed hollow body (rod) 2 Support rod 3 drive motor 4 Lifting screw rod 5 screws 6 round top plate 6 7 openings 8 screw holes 9 elastic body 10 circular flange 11 circular nozzle 12 screws 13 Ring-shaped fixing member (upper expansion limiting jig) 14 screws 15 Lower fixing member (lower expansion limiting jig) 16 steps 17 groove 18 Fluid supply / discharge pipe 19 Exhaust pipe (pressure adjustment pipe) 20 Pressure control valve 21 Substrate (photosensitive drum) 22 Coating liquid storage tank (cylinder) 23 coating liquid 24,25 ring-shaped member 31 Lower space

Continuation of the front page (56) Reference JP-A-3-60765 (JP, A) JP-A-4-240086 (JP, A) JP-A-59-4467 (JP, A) JP-A-61-39048 (JP , A) JP 62-65763 (JP, A) JP 64-47471 (JP, A) JP 1-297172 (JP, A) JP 2-21962 (JP, A) JP 3-60763 (JP, A) JP-A-3-60769 (JP, A) Actual development Sho 63-94569 (JP, U) Actual development Sho 63-201673 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 5/00-5/16

Claims (4)

(57) [Claims] 1. An apparatus for producing an electrophotographic photosensitive member, wherein an elastic body capable of expanding and contracting holds an inner side of a cylindrical substrate, immerses it in a coating liquid, and coats the coating liquid on the outer peripheral surface of the cylindrical substrate. An apparatus for manufacturing an electrophotographic photosensitive member, which satisfies all of the following requirements (1) to (3). (1) A structure in which the elastic body is covered with a bottomed hollow body having a fluid supply / discharge port in the upper portion and an opening in the peripheral wall, (2) the elastic body is a bottomed cylindrical body, and the upper end portion Circular flanges are concentrically provided on the base plate, and circular nozzles are concentrically provided at the center of the bottom plate and project downwardly. (3) A circular flange at the upper end of the elastic body and a circular nozzle at the lower end. Is fixed to the bottomed hollow body in a state of being tightened by a fixing member via a ring-shaped member, and the elastic body has a sealed structure. 2. A circular top plate provided with a supply / discharge port for the fluid and a screw on an outer peripheral surface of the hollow body with a bottom, and a ring-shaped fixing member having a screw formed on an inner peripheral surface of the circular top plate. 2. The apparatus for manufacturing an electrophotographic photosensitive member according to claim 1, wherein the circular flange of the elastic body is screwed into and fixed to the circular top plate by a ring-shaped fixing member. 3. A bottom nozzle of the hollow body having a bottom is provided with a screw hole in the center thereof, and a lower fixing member having a screw formed on the outer peripheral surface of the upper end is screwed into the screw hole to form a circular nozzle of the elastic body. The apparatus for manufacturing an electrophotographic photosensitive member according to claim 1 or 2, wherein the electrophotographic photosensitive member is held and fixed by a bottom plate and a lower fixing member. 4. A circular top plate of the hollow body with a bottom, an exhaust pipe passing through the inside of the hollow body with a bottom and the lower fixing member, and a pressure adjusting valve provided in the exhaust pipe. The manufacturing apparatus for an electrophotographic photosensitive member according to claim 1.