JP3120584B2 - Photoreceptor drum with drum holding plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive drum to which a drum holding plate is attached, and more particularly to a photosensitive drum to which a drum holding plate is attached with an adhesive.

[0002]

2. Description of the Related Art A drum holding plate is attached to a photosensitive drum used in an electrophotographic copying machine, a printer or the like. The drum holding plate is used for supporting and rotating the drum and for establishing electrical continuity. Conventionally, when a drum is held by a drum holding plate, a method of fixing the drum with a connecting means such as a screw has been adopted. However, this method is not only complicated in a manufacturing process but also reduces the size and weight of an electrophotographic copying machine. There was a problem that it was not suitable for conversion. Therefore, Japanese Patent Application Laid-Open No. 60-201357
As described in Japanese Patent Application Laid-Open Publication No. H10-115, a method of bonding and fixing a drum and a drum holding plate with an adhesive is also performed. However, in the case of bonding with an adhesive, the adhesive strength may be reduced after long-term use, and the adhesive may come off due to impact force or the like. In particular, when a conventionally used α-cyanoacrylate-based adhesive is used, it has a drawback that it is weak against impact force with respect to an aluminum drum.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation of the prior art. That is, an object of the present invention is to provide a photosensitive drum in which the adhesive force between a drum and a drum holding plate is improved.

[0004]

As a result of various studies, the present inventor adhered the drum holding plate to the drum with an adhesive,
In fixing, the inventor has found that the above-mentioned object is achieved by forming a coating film on the inner surface of the end of the drum with the coating liquid for forming the undercoat layer in advance on the adhesive surface with the drum holding plate, and completed the present invention. I came to. That is, the photoreceptor drum of the present invention comprises a drum having a photosensitive layer formed on a cylindrical hollow substrate via an undercoat layer, and a drum holding plate adhered to the inner surface of the end of the drum with an adhesive, and fixed. Drums,
A coating film is formed on the inner surface of the drum end with the coating solution for forming the undercoat layer on the adhesive surface with the drum holding plate.
It is characterized in that it is an adhesive surface with the holding plate .

The present invention will be described with reference to FIG. 1. In FIG. 1, reference numeral 3 denotes a drum, and the surface of a cylindrical hollow substrate (hereinafter, referred to as a substrate) 1 has a single-layer structure or It has a structure in which a photosensitive layer 2 having a laminated structure composed of a charge generation layer and a charge transport layer is formed. On the inner surfaces of both ends of the drum, a coating film 8 is formed by a coating liquid for forming an undercoat layer. On the other hand, reference numeral 4 denotes a drum holding plate, on the periphery of which a fitting portion 5 and a flange 6 are provided. An adhesive 9 is applied to the surface of the fitting portion.
In order to fix the drum holding plate 4 to the drum 3, first, the drum holding plate 4 is fitted to the drum 3, and the adhesive 9 on the side of the fitting portion of the drum holding plate 4 and the inner surface of the end of the drum Then, the adhesive 8 may be cured by bringing the coating film 8 into close contact and then heating.

The substrate of the present invention includes aluminum,
Metals such as copper, iron, zinc, nickel, plastic, paper,
Aluminum, copper, gold, on plastic or glass
Evaporate metal such as silver, platinum, palladium, titanium, nickel-chromium, stainless steel, copper-indium, laminate metal foil, or carbon black, indium oxide, tin oxide-antimony oxide powder, metal powder, etc. Is dispersed in a binder resin, and a known material that has been subjected to a conductive treatment by coating can be used. However, the present invention is not limited thereto. Further, if necessary, the substrate surface can be subjected to various treatments within a range that does not affect the image quality. For example, surface oxidation treatment, chemical treatment, coloring treatment, or the like, or irregular reflection treatment such as graining can be performed.

As the drum holding plate, any material may be used as long as it is a known material, but a plastic material is suitable. Specifically, for example, phenolic resin,
Amino resin, allyl resin, epoxy resin, polystyrene, ABS resin, acrylic resin, PVC resin, polyamide, polyimide, polycarbonate, polyacetal,
Polyester resins such as polyphenylene oxide, polyethylene terephthalate and polybutylene terephthalate, polyarylate, polysulfone, polyethersulfone and the like can be used. A plastic drum holding plate using these materials has the advantages that it is lightweight, has good adhesion, can be mass-produced, and that even if there is some error in dimensions, it can be compensated by elasticity.

In the present invention, the coating liquid for forming an undercoat layer for forming a coating film contains a binder resin and, if necessary, an organic metal compound such as an organic zirconium compound or an organic titanium compound and a silane coupling agent. The resulting mixture was dissolved in a solvent. The binder resin used in the coating liquid for forming an undercoat layer, for example, polyvinyl methyl ether, poly -N- vinylimidazole, polyethylene oxide, ethyl cellulose scan, methylcellulose, ethylene - acrylic acid copolymers, polyamides, casein, Gelatin, polyethylene, polyester, phenolic resin,
Vinyl chloride-vinyl acetate copolymer, epoxy resin, polyvinyl pyrrolidone, polyvinyl pyridi, polyurethane,
Examples of resins include polyglutamic acid and polyacrylic acid. As the solvent used in the coating liquid for forming an undercoat layer, methanol, ethanol, water, n- butanol, benzyl alcohol, methyl cellosolve, Echiruse b Sol <br/> Bed, acetone, methyl ethyl ketone, cyclohexanone, methyl acetate, dioxane , Tetrahydrofuran, methylene chloride, chloroform and the like. These solvents can be used alone or in combination of two or more.

As a method for applying the above coating solution, a dip coating method is preferable. When a coating film is formed by the dip coating method, the formation of the undercoat layer only requires the intrusion of the undercoat layer-forming coating liquid into the inner surface of the substrate, which is advantageous in that the operation can be simplified. However, simultaneously with the formation of the undercoat layer,
The coating method of forming a coating on the inner surface of the end of the substrate can be applied only when forming a coating on the lower end, which is one end of the substrate. The coating film may be formed with a sponge, a brush or the like in addition to the dip coating method. The coating operation is preferably performed simultaneously with the formation of the undercoat layer on the substrate surface or immediately after the formation of the undercoat layer. In this case, the coating on the inner surface of the substrate is dried (cured) at the same time as the heating and drying (curing) of the undercoat layer on the surface, so that the operation can be simplified and the efficiency is high.

As the adhesive used in the present invention, any known adhesive can be used. For example,
A curable resin in the form of a viscous liquid at room temperature is preferable, and specifically, an α-cyanoacrylate adhesive or an epoxy adhesive combined with a curing agent is preferable. Examples of the α-cyanoacrylate-based adhesive include Aron Alpha (manufactured by Toagosei Kagaku) and Eastman 910 (manufactured by Eastman Kodak). Further, as the epoxy adhesive, a bisphenol A type epoxy resin which is a liquid viscous resin and a curing agent can be used. Specifically,
“Epicoat 815”, “Epicoat 827”, “Epicoat 828”, “Epicoat 832”, “Epicoat 834” (all manufactured by Shell Chemical Company), “Araldite GY”
252 "," Araldite GY250 "," Araldite GY260 "(all manufactured by Ciba-Geigy)," DE
R ・ 330 」、「 D ・ E ・ R ・ 331 」、「 D ・ E ・ R 」
• 332 ”(both manufactured by Dow Chemical International). Examples of the curing agent include amine curing such as diethylenetriamine, triethylenetriamine, diethylaminopropylamine, N-aminoethylpiperazine, benzyldimethylamine, tris- (dimethylaminomethyl) phenol, metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenylsulfone. Agents can be used. These amine curing agents are used in an amount of from 5% by weight to the bisphenol-type epoxy resin.
It can be contained at a ratio of 35% by weight.

[0011]

[Function] When the coating liquid for forming the undercoat layer is applied to the adhesive surface of the drum holding plate on the inner surface of the drum and a coating film is formed, the coating film acts as a primer. It is considered that the drum holding plate is more firmly bonded than when the drum holding plate is directly bonded to the drum. That is, since the coating film formed on the inner surface of the edge of the drum contains the organic solvent, the wettability to the drum is good. Therefore, the undercoat layer coating spreads more widely than the adhesive and adheres. Therefore, the adhesive force to the drum is stronger than the adhesive applied directly to the drum. Therefore, even if the photosensitive drum is driven with a high torque, the drum holding plate does not loosen and does not come off.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view for explaining a state in which the drum holding plate is fitted to the drum. A photosensitive layer 2 is formed on the surface of a substrate 1 with an undercoat layer interposed therebetween to form a drum 3. On the inner surfaces of both ends of the drum, a coating film 8 is formed by a coating liquid for forming an undercoat layer. On the other hand, a fitting portion 5 and a flange 6 are provided on a peripheral portion of the drum holding plate 4, and an adhesive 9 is applied to a side surface of the fitting portion. Further, a hole 10 through which a shaft is passed is formed in the center of the drum holding plate 4. Reference numeral 7 denotes a conductive member, which electrically connects the drum holding plate and the inner surface of the drum on which the coating film is not formed, to thereby electrically connect (ground) the photosensitive drum.

Next, a specific example of fitting and fixing the drum holding plate to the drum in the present invention will be described. 6 parts of N-methylated nylon 12 resin (trade name: Toresin G550, manufactured by Teikoku Chemical Industry Co., Ltd.) (meaning parts by weight, the same applies hereinafter) are dissolved in 60 parts of methanol and 34 parts of n-butanol and subbed. A coating solution for forming a layer was prepared. A mirror-cut 84 mmφ × 310 mm aluminum pipe was used as a substrate, and an undercoat layer was formed on the substrate by a dip coating apparatus as shown in FIG.

In the dip coating apparatus shown in FIG.
Is filled with a coating liquid 12 for forming an undercoat layer.
Reference numeral 1 denotes a base, which is held by a chucking member 20 via a support arm 16 and a support rod 15 which move up and down by a motor 13 and a ball screw 14. Reference numeral 18 denotes a pump for returning the coating liquid 12 for forming an undercoat layer overflowing from the coating tank 11 to the bottom of the coating tank through a pipe 17, a filter 19 and a pipe 17.

FIG. 3 is a view for explaining a state in which the substrate is gripped in the dip coating apparatus of FIG. In the figure, a base 1 is supported by a chucking member 20 and an O-ring 22 attached to a support rod 15. The chucking member 20 is provided with a valve 21.
By opening and closing the valve, it becomes possible to keep the inside of the substrate being immersed in an open state and an airtight state.

When forming the undercoat layer, first, the valve 2
In a state where 1 is opened, the substrate 1 supported by the chucking member 20 and the O-ring 22 is lowered by driving the motor 13 and is immersed in the coating liquid 12 for forming an undercoat layer in the coating tank 11. . 10 m from the lower end of base 1
When the portion m was immersed, the valve 21 that had been open was closed, and the base 1 was lowered as it was until a portion 15 mm from the upper end of the base 1 was immersed.
In this case, since the inside of the base is kept airtight by the O-ring, the undercoat layer forming coating liquid does not enter the inside of the base. Next, the substrate 1 was pulled up at a speed of 200 mm / min, and when the portion from the lower end of the substrate 1 to 15 mm was immersed, the valve 21 was opened and the coating liquid for forming the undercoat layer inside the substrate was discharged. The substrate was further pulled up, and a coating solution for forming an undercoat layer was applied to the surface of the substrate and the inner surface of the lower end up to 15 mm. Next, the coating film was dried at 120 ° C. for 10 minutes to form an undercoat layer having a thickness of 1.0 μm on the surface and a coating film having the same composition as the undercoat layer inside the lower end of the substrate.

Next, the substrate 1 is removed from the dip coating apparatus, and the same undercoat layer forming coating solution as described above is applied to the other inner surface of the substrate 1 by a sponge roller. The same drying treatment was performed. As a result, the substrate 1 having the coating film 8 formed on both inner surfaces was obtained.

Next, a charge generation layer and a charge transport layer were formed on the undercoat layer formed as described above by a dip coating method. In these cases, during the dip coating, the coating was performed as follows while keeping the valve 21 closed to prevent the coating liquid from entering the inside of the substrate. That is, polyvinyl butyral resin (trade name: S-LEC BM-1,
One part of Sekisui Chemical Co., Ltd. (1 part) was dissolved in 19 parts of cyclohexanone, and to this solution, 8 parts of dibromoanthanthrone pigment (CI Pigment Red 168) and 0.02 part of trifluoroacetic acid were added. Next, a dispersion treatment was performed by a sand mill using 1 mmφ glass beads as a dispersion medium, and cyclohexanone was further added to the obtained dispersion to prepare a coating solution for forming a charge generation layer having a solid content of about 10%. This coating solution was applied on the undercoat layer and dried by heating at 100 ° C. for 10 minutes to form a charge generation layer having a thickness of 0.8 μm.

Further, N, N'-diphenyl-N, N '
-Bis (3-methylphenyl)-[1,1'-biphenyl] -4,4'-diamine (4 parts) as a charge-transporting material and monochlorobenzene 4 together with 6 parts of a polycarbonate Z resin
0 parts to prepare a coating solution for forming a charge transport layer, apply this coating solution on the charge generation layer by a dip coating method, and dry at 110 ° C. for 1 hour to form a charge transport layer having a thickness of 20 μm. A layer was formed.

The drum holding plate 4 was attached to the drum 3 on which the coating film 8 was formed on the inner surface of the end in the following manner. Referring to FIG. 1, a drum holding plate 4 made of polyacetal is used.
Is fixed to the drum 3, first, a two-liquid mixed type epoxy made of a bisphenol type epoxy resin (trade name: Epicoat 328, manufactured by Shell) and an amine-based curing agent (diethylenetriamine) is attached to the fitting portion 5 of the drum holding plate. Adhesive 9
Then, the drum holding plate 4 is fitted to the drum 3,
The adhesive 9 on the side of the fitting portion of the drum holding plate 4 and the coating film 8 on the inner surface of the end of the drum were brought into close contact with each other, and then heated to cure the adhesive, and the drum holding plate 4 was fixed to the drum 3. .

With respect to the photosensitive drum having the drum holding plate attached to the drum as described above, an impact resistance test was conducted to measure the impact resistance. The measuring method was such that a weight of 500 g was dropped inside the drum holding plate, and the height of the weight when the drum holding plate came off was measured. In the case of the photoreceptor drum shown in the example, even if the weight was dropped from a height of 1 m, it did not come off, and it came off at 1.5 m. In the case of no drum holding plate, the drum holding plate came off simply by dropping the weight from a height of 50 cm. Those as apparent examples from the test results, compared to those that did not form a coating film of the undercoat layer on the inner surface of the drum, adhesive strength is improved.

[0022]

According to the present invention having the above structure, the adhesive strength between the drum and the drum holding plate is strong, and the drum holding plate does not become loose even when the drum is driven with high torque.
It will not come off. In the case of using a coating liquid for forming an undercoat layer on the inner surface of the drum and forming a coating film by a dip coating method, the coating can be carried out simultaneously with or subsequent to the formation of the undercoat layer. Therefore, the operation for mounting the drum holding plate can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a drum and a drum holding plate of the present invention.

FIG. 2 is a schematic view of a dip coating apparatus for forming an undercoat layer and a coating film.

FIG. 3 is a diagram illustrating a state in which a drum is held by a chucking member in the dip coating device of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 2 ... Photosensitive layer formed through undercoat layer, 3
... Drum, 4 ... Drum holding plate, 5 ... Fitting part, 6 ... Flange, 7 ... Conductive member, 8 ... Coating film, 9 ... Adhesive, 10 ... Hole
DESCRIPTION OF SYMBOLS 11 ... Coating tank, 12 ... Coating liquid for undercoat layer formation, 13 ... Motor, 14 ... Ball screw, 15 ... Support rod, 16 ... Support arm, 17 ... Piping, 18 ... Pump, 19 ... Filter, 20 ... Chucking Member, 21 ... Valve, 22 ... O
-Rings.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 5/10 G03G 5/00 101 G03G 5/14 G03G 21/00 350

Claims (2)

(57) [Claims] 1. A photoconductor drum comprising a drum having a photosensitive layer formed on a hollow cylindrical substrate via an undercoat layer, and a drum holding plate adhered to an inner surface of an end portion of the drum with an adhesive, and fixed. A coating film is formed on the inner surface of the end portion with the coating solution for forming the undercoat layer on the adhesive surface with the drum holding plate.
Photosensitive drum, characterized in that the the adhesion surface of the drum holding plate. 2. The photosensitive drum according to claim 1, wherein the undercoat layer and the coating film are formed by a dip coating method.