WO2013187738A1

WO2013187738A1 - Photosensitive drum for electrphotographicimage formation and process cartridge comprising same

Info

Publication number: WO2013187738A1
Application number: PCT/KR2013/005293
Authority: WO
Inventors: 최정환; 권진환; 도상일
Original assignee: 주식회사 파캔오피씨
Priority date: 2012-06-14
Filing date: 2013-06-14
Publication date: 2013-12-19
Also published as: KR101454462B1; KR20130040761A

Abstract

The present invention relates to a photosensitive drum for electrophotographic image formation and a process cartridge comprising the photosensitive drum and, more specifically, to a photosensitive drum for electrophotographic image formation, comprising: a cylindrical member having a photosensitive layer formed around the circumference thereof; and at least two protrusions having a cylindrical shape or a polygonal pillar shape provided on one end portion of the cylindrical member to receive a driving force from the rotatable driving member, wherein a recessed groove which is recessed in a straight line is formed on the center of the protrusions such that when the protrusions are inserted into a distorted opening and the rotatable driving member is rotated, the recessed groove of the protrusions is held and fixed at the entrance of the distorted opening whereby the driving force is transferred. The photosensitive drum for electrophotographic image formation and the process cartridge comprising the photosensitive drum of the present invention can be coupled to a body of an electrophotographic image formation device comprising a distorted opening having a non-circular cross section with a plurality of corners and can minimize damage to components, and can reduce manufacturing costs of dies through the simple structure thereof and extend the replacement period of the dies, and thus the present invention can be differentiated from the existing prior art, and economical efficiency can be obtained.

Description

Photosensitive drum for electrophotographic image forming and process cartridge including the photosensitive drum

The present invention relates to an electrophotographic photosensitive drum and a process cartridge including the photosensitive drum. More specifically, the present invention relates to a motor, a drive rotatable member that receives a driving force from the motor, and a center portion of the drive rotatable member. An electrophotographic photosensitive drum for electrophotographic image forming apparatus having a distortion hole having a non-circular cross section having a plurality of corner portions and for forming an image on a recording material, the photosensitive drum for electrophotographic image forming And a cylindrical member having a photosensitive layer on its circumferential surface, and a protrusion provided at one end of the cylindrical member to receive a driving force from the drive rotatable member and having at least two cylindrical or polygonal pillar-like protrusions, A groove is formed in the middle of the protrusion so as to form a groove in the distortion hole. In turn, after rimmed driving rotatable member relates to a process cartridge including the distortion hole is a groove in the protruding portion fixing jammed at the entrance to the photosensitive drum for the image forming, characterized in that such driving force is transmitted and the photosensitive drum.

BACKGROUND ART [0002] Electrophotographic image forming apparatuses such as copiers and laser beam printers (LBPs) are one of the most popular electronic devices at present with the spread of computers. In the present specification, the electrophotographic image forming apparatus means an apparatus for forming an image on a recording medium using an electrophotographic image forming method, for example, an electrophotographic copying machine, an electrophotographic printer, a facsimile apparatus or the like. Further, the process cartridge may be detachably mounted to the main body of the electrophotographic image forming apparatus, and includes at least one of charging means as processing means, developing means as processing means, and cleaning means as processing means. Means a cartridge that is integrally disposed so that the electrophotographic photosensitive drum can be detachably mounted to the main body of the image forming apparatus. It also includes a cartridge that can be detachably mounted to the main body of the electrophotographic image forming apparatus, and that the developing means as processing means and the cartridge are integrally disposed so that the electrophotographic photosensitive drum can be detachably mounted to the main body of the image forming apparatus. do.

In an electrophotographic image forming apparatus using an electrophotographic image formation type, a latent image is formed by selectively exposing an electrophotographic photosensitive member uniformly charged by a charging means to image forming light. The latent image is developed into a toner image by the developing means with the toner. The formed toner image is transferred to the recording medium by the transfer means to form an image on the recording material. Various methods have been proposed for rotating an electrophotographic photosensitive drum.

Representatively, the Korean Patent No. 270672 of Canon Corp., Inc. discloses a process cartridge detachably mountable to a drive rotatable member of an electrophotographic image forming apparatus, wherein the main assembly includes a motor and a main assembly side for receiving driving force from the motor. A gear, a main assembly groove formed by a twisted surface and substantially coaxial with the gear, and a main assembly protrusion provided in the main assembly and substantially coaxial with the gear, the process cartridge comprising: A photosensitive drum, process means actable on the electrophotographic photosensitive drum, a twist cartridge protrusion that is engageable with the twisted surface and is provided at a longitudinal end of the electrophotographic photosensitive drum, and is provided at a free end of the cartridge protrusion; Cartridge protrusion And a cartridge groove substantially coaxial with the main assembly protrusion when the process cartridge is mounted to the main assembly, the main assembly protrusion entering the cartridge groove and rotating with the main assembly groove and the cartridge protrusion with the main assembly side gears coupled to each other. And a rotational driving force is transmitted from the gear to the photosensitive drum through the coupling of the main assembly recess and the cartridge protrusion to the main assembly of the image forming apparatus for forming an image on a recording material. A photosensitive drum embedded in a detachably mountable process cartridge, wherein the main assembly includes a motor, a main assembly side gear for receiving driving force from the motor, a twist groove having a polygonal cross section formed substantially in the center of the gear, Casting in the groove And a photosensitive drum, wherein the photosensitive drum includes a cylinder having a photosensitive layer thereon, and a drive transmission member mounted to an end of the cylinder, wherein the transfer member provides a driving force when the process cartridge is mounted to the main assembly. A gear for transferring from the main assembly to the developing roller, a shaft provided substantially at the center of the gear, and a twisted protrusion provided at an end of the shaft, wherein the protrusion is coupled to the groove and the protrusion from the main assembly. Receiving a driving force, the cartridge groove is provided to the twist protrusion, the driving force is transmitted to the photosensitive drum through the shaft, and is transferred to the developing roller through the gear by the main assembly protrusion; , Electrophotographic image formation for forming an image on a recording material A driving force transmitting member for transmitting driving force to an electrophotographic photosensitive drum embedded in a process cartridge detachably mountable to a main assembly of an apparatus, and a developing roller for developing a latent image formed on the photosensitive drum, the main assembly comprising: a motor; And a main assembly side gear for receiving a driving force from the motor, a twist groove having a polygonal cross section formed substantially in the center of the gear, and a main assembly protrusion provided in the groove, wherein the drive transmission member includes: A gear for transmitting a driving force from the main assembly to the developing roller when mounted to the main assembly, a shaft provided substantially at the center of the gear, and a twisted protrusion provided at an end of the shaft, the projection from the main assembly Driving force through the combination of the groove and the protrusion And the cartridge groove is provided in the twist protrusion, the driving force is transmitted to the photosensitive drum through the shaft, and is transmitted to the developing roller through the gear while the main assembly protrusion is in the cartridge groove. A driving force transmitting member is disclosed. In addition, the patent publication of Korean Patent No. 258609 discloses a processing cartridge that can be detachably mounted to a main assembly of an electrophotographic image forming apparatus for forming an image on a recording material, wherein the apparatus includes a motor and a driving force from the motor. And a distorting hole having a drive rotatable member for transmitting, and a non-circular cross section formed in a central portion of the drive rotatable member, the non-circular cross section having a plurality of corner portions, wherein the processing cartridge includes an electrophotographic photosensitive drum and the electrophotographic photosensitive The processing cartridge is provided with processing means operable on a drum, and having a non-circular cross section provided at an end of the electrophotographic photosensitive drum, the non-circular cross section having a plurality of corner portions, and which can be combined with the distortion hole. A distortion mounted to a main assembly such that the drive rotatable member is engaged with the distortion hole When rotating with the protrusions, a rotational driving force is transmitted from the drive rotatable member to the electrophotographic photosensitive drum by the coupling between the distortion holes and the distortion protrusions, and the distortion protrusions are pressed toward the distortion holes. A driving force transmitting member for transmitting a driving force to a cartridge and a developing roller for developing a latent image formed on the photosensitive drum and the electrophotographic photosensitive drum, wherein the photosensitive drum and the developing roller transmit a driving force from the motor and the motor. Is housed in a processing cartridge that is removably mounted to the main assembly of the electrophotographic image forming apparatus, the main assembly gear comprising a main assembly gear and a distortion hole having a substantially triangular cross section and formed in a central portion of the main assembly gear, The driving force transmitting member is the processing cartridge A drum gear which transmits the driving force received from the main assembly to the developing roller when the main assembly is mounted to the main assembly, an axis provided at the center of the drum gear, and a substantially triangular prism shape at the end of the axis, and forming the image forming apparatus. An electrophotograph for forming an image on a driving force transmission member and a recording material, characterized in that it is coupled to a distortion hole of a main assembly of the main assembly, the distortion protrusion having a driving force from the main assembly when the processing cartridge is mounted to the main assembly. In an electrophotographic photosensitive drum for an image forming apparatus, the apparatus includes a motor, a drive rotatable member that receives a driving force from the motor, and a non-circular cross section having a plurality of corner portions formed in a central portion of the drive rotatable member. And a twisting hole having an electrophotographic photosensitive drum, A cylindrical member having a photosensitive layer, and a distortion protrusion having a non-circular cross section provided at one end of the cylindrical member and coupled with the distortion hole so as to receive a driving force from the main assembly, and having a plurality of corner portions. Thus, when the photosensitive drum is mounted to the main assembly, an electrophotographic photosensitive drum or the like is disclosed, wherein the distortion protrusion is coupled to the distortion hole to receive a driving force to rotate the electrophotographic photosensitive drum.

Canon's patents described above are now de facto industry standards, as they are used in more than 90% of electrophotographic image forming devices, including laser beam printers worldwide. By the way, the photosensitive drum according to the above scheme can be combined with the distortion hole which is driven by being coupled to the distortion hole having a non-circular cross section with a plurality of corner portions of the main body, and has a non-circular cross section with a plurality of corner portions. It must have a distortion protrusion. Due to the existence of such patents, the price of the cartridge, which is a consumable in the market, is very high, resulting in a monopoly damage, and in addition to compromising free competition, there are problems such as an increase in mold cost due to a complicated form.

Thus, efforts have been made to avoid the patent. Republic of Korea Utility Model Registration No. 2010-8538, the toner is provided with a first shaft formed in the center of rotation of the triangular torsion hole of the shape of the triangular torsional shape is rotated by a drive motor, the triangle cross section is rotated as the depth is deepened, the toner In the state where the process cartridge storing the pressure is mounted on the main body of the image forming apparatus, at least a portion of the insertion column of the drive assembly coupled to one end of the photosensitive drum in the process cartridge is inserted into the triangular torsion hole, In the rotation driving force transmission structure of the image forming apparatus in which the photosensitive drum is rotated while the insertion column is rotated in response to the rotational drive, three end portions protruding radially at the rotation angle positions corresponding to the vertices of the triangle at the leading end of the insertion column. A first locking projection is formed, the insertion spaced apart from the first locking projection At the base of the pillar, a second locking projection is formed to radially protrude so as to have a rotational deviation by the twist angle of the triangular torsional section of the triangular torsion hole. When the first axis starts to rotate, the first locking projection is rotated while contacting the triangular torsion hole. The driving force is transmitted, and as the rotation of the first shaft progresses, the first locking projection reaches a deep position of the torsion coupling hole, and the second locking projection contacts the torsion surface of the inlet side of the triangular torsion hole, and the rotation driving force is transmitted. Disclosed is a rotation driving force transmission structure of an image forming apparatus. However, the driving force transmission structure disclosed in the above document has a high possibility of forming an infringement of the Canon patent, and has a side effect such that the locking projections are broken during use due to insufficient strength of the locking projections. The present applicant has developed a photosensitive drum having a protruding portion in the form of a simple triangular prism in order to circumvent the patent, but experienced the deformation or breakage of the shape of the protrusion or the distortion hole of the main body. This is because when the drum is coupled to the printer body, the shape of the distortion hole of the body to which the protrusion of the drum is coupled has a three-dimensional twisted shape. Therefore, the opening of the hole has a sharp edge. This is because the transmission appears in the form of point contact.

Accordingly, a technical object of the present invention is to be able to be bonded to an electrophotographic image forming apparatus main body having a distortion hole having a non-circular cross section having a plurality of corner portions, while minimizing damage to a part, and the structure is simple. It is possible to provide a process cartridge including the photosensitive drum and an electrophotographic photosensitive drum capable of reducing manufacturing costs and extending the mold replacement time, thereby avoiding existing patents and achieving economic feasibility.

In order to achieve the above technical problem, the present invention includes a motor, a drive rotatable member that receives a driving force from the motor, and a distortion hole having a non-circular cross section formed at a central portion of the drive rotatable member and having a plurality of corner portions. And a photosensitive drum for electrophotographic image forming for forming an image on a recording material, the photosensitive drum for electrophotographic image forming comprising: a cylindrical member having a photosensitive layer on its peripheral surface; A protruding portion provided at one end of the cylindrical member and including at least two cylindrical or polygonal shaped protrusions to receive a driving force from the main assembly, and having a recess formed in a straight line in the middle of the protruding portion. The groove of the protrusion is inserted into the inlet of the distortion hole when the drive rotatable member is rotated after It provides a photosensitive drum for electrophotographic image formation, characterized in that it is locked and fixed so that the driving force is transmitted.

In another aspect, the present invention provides a photosensitive drum for electrophotographic image formation, characterized in that the protrusion is composed of a main cylinder of the center portion and a plurality of secondary cylinders formed on the periphery of the main cylinder.

Further, the present invention provides a photosensitive drum for electrophotographic image formation, wherein the number of the secondary cylinders is equal to or less than the number of corner portions of the distortion hole.

In addition, the present invention provides a photosensitive drum for electrophotographic image formation, characterized in that the secondary cylinder is formed symmetrically about the main cylinder.

In addition, the present invention provides a photosensitive drum for electrophotographic image formation, wherein the groove is formed in the secondary cylinder.

The present invention also provides a photosensitive drum for electrophotographic image formation wherein the groove is formed in a direction opposite to the rotational direction of the distortion hole when viewed in the engagement direction.

In addition, the present invention is a through hole provided with a locking jaw inside the distal end of the main cylinder, an elastic member located inside the through hole, a sleeve positioned at one end of the elastic member to prevent the advance by the locking jaw and It provides an electrophotographic photosensitive drum, characterized in that it further comprises a metal grounding portion electrically connected to the photosensitive drum body and inserted into the sleeve.

In addition, the present invention provides a photosensitive drum for electrophotographic image formation, characterized in that the material of the metal ground portion is brass.

The present invention also provides a process cartridge comprising the photosensitive drum for electrophotographic image formation.

The photosensitive drum for electrophotographic image forming and the process cartridge including the photosensitive drum of the present invention can be coupled to an electrophotographic image forming apparatus main body having a distortion hole having a non-circular cross section having a plurality of corners, while minimizing damage to components. In addition, since the structure is simple, the manufacturing cost of the mold can be reduced, and the replacement time of the mold can be extended, thereby avoiding the existing patent and achieving economic feasibility.

1 is a structural diagram showing a coupling relationship between a protrusion 17 and a main body distortion hole 18 of a conventional electrophotographic photosensitive drum.

Figure 2 is a perspective view showing an example of the drum flange 20 and the

projections

10, 11, 11a of the photosensitive drum for electrophotographic image formation according to the present invention

3 shows a process in which the

projections

11 and 11a of the photosensitive drum for electrophotographic imaging according to the present invention are coupled to a distortion hole 18 having a non-circular cross section having a plurality of corner portions of the main body to transmit a rotational driving force. Section to explain

Figure 4 is a partial perspective view of the electrophotographic image-forming photosensitive drum of the present invention further includes an elastic member for grounding, a sleeve and a metal grounding portion;

FIG. 5 is a partial cross-sectional view of further including an elastic member, a sleeve, and a metal grounding portion for the grounding of FIG. 4; FIG.

10: protrusion body 11: main cylinder

11a: cylinder column 11b: groove

16a: gear 18: distortion hole

20: drum flange 21: locking jaw

30: elastic member 40: metal ground

50: Sleeve

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram showing a coupling relationship between the protrusion 17 and the main body distortion hole 18 of the conventional electrophotographic photosensitive drum. As can be seen in FIG. 1, the conventional electrophotographic photosensitive drum has the effect of coinciding the center of rotation due to the existence of the twisted protrusion 17 which coincides with the twisted shape of the distortion hole 18 of the body portion. . Most of the distortion holes 18 and the distortion protrusions 17 have a triangular cross section.

As described above, the present inventors have produced a photosensitive drum having a projection of a simple triangular pillar shape, coupled to the main body test, and found that the corner of the triangular prism is formed at the sharp distortion hole entrance of the main body, It has been found that the inlet causes the problem of deformation or breakage, and the twisted internal shape of the distorting hole pushes out the protrusion, causing the photosensitive drum to break away. This is because the shape of the distorted hole of the body portion has a three-dimensional twisted shape, the opening of the hole has a sharp edge (edge), which makes it difficult to apply a protrusion that does not have a twisted shape, such as a printer according to Canon patent It will limit the type of photosensitive drum or process cartridge applicable.

The electrophotographic photosensitive drum of the present invention has a motor, a drive rotatable member that receives a driving force from the motor, and a distortion hole having a non-circular cross section formed at a central portion of the drive rotatable member and having a plurality of corner portions. And an electrophotographic image forming apparatus for forming an image on a recording material. The description of the main body and the photosensitive drum of the electrophotographic image forming apparatus has been described in the detailed description of the above-described inventions of Korean Patent No. 258609 and Korean Patent No. 270672, except for a drum flange and a protrusion. Detailed description will not be given.

An electrophotographic photosensitive drum of the present invention is provided with a cylindrical member having a photosensitive layer on its peripheral surface, and provided at one end of the cylindrical member so as to receive a driving force from the drive rotatable member, and having at least two cylinders or It includes a projection (11, 11a) in the form of a polygonal column, the groove 11b is formed in the middle of the projection (11, 11a) to form a groove 11b is inserted into the distortion hole 18, the projection (11, 11a) After the rotation of the drive rotatable member is characterized in that the inlet of the distortion hole 18 is fixed to the groove (11b) of the protrusions (11, 11a) to transmit the driving force.

3 shows a process in which the

projections

11 and 11a of the photosensitive drum for electrophotographic imaging according to the present invention are coupled to a distortion hole 18 having a non-circular cross section having a plurality of corner portions of the main body to transmit a rotational driving force. It is sectional drawing for illustration. In the present specification, the expression 'projection' may refer to both the protrusion body 10 and the

portions

11 and 11a directly coupled to the distortion hole 18, and directly coupled to the distortion hole 18. Although it may mean only a cylinder or the like portion, it means a portion (11, 11a) that is directly coupled with the distortion hole 18 unless otherwise specified. As shown in Fig. 3, the

protrusions

11 and 11a of the photosensitive drum for electrophotographic image formation of the present invention are inserted into the distortion holes 18 (Fig. 3 (a)), thereby distorting during rotation of the rotatable member of the main body portion. The groove 11b of the protrusion is caught and fixed at the inlet of the hole 18 (FIG. 3 (b)) to transmit the driving force to the part requiring the driving force of the drum and the process cartridge. In addition, as shown in Figure 3, the protrusion and the distortion hole is in line contact when the driving force is transmitted. As described above, since the inlet of the main body distortion hole has a very sharp shape, when the protrusion has the shape of a simple cylinder or a polygonal pole, it becomes a point of contact when the driving force is transmitted, and a large shear force is applied to the contacting portion, thereby causing the protrusion. And / or the inlet of the distortion hole in contact with the protrusion may be damaged. The present inventors are applicable to the electrophotographic image forming apparatus main body portion in accordance with the above-described Canon patent, and the inlet or protrusion portion of the distortion hole 18 is applied to the sharpness of the inlet of the distortion hole 18 of the main body portion of the electrophotographic image forming apparatus. As a result of researches for developing an electrophotographic photosensitive drum for effectively transmitting the rotational driving force generated in the main body portion to the photosensitive drum without breaking 11, 11a), the shape of the

protrusions

11, 11a In the case of forming a plurality of straight cylinders or polygonal pillars and having grooves 11b having appropriate lengths and depths in contact with the inlet of the distortion holes 18, the

protrusions

11 and 11a and the distortion during the transmission of the rotational driving force. The contact of the holes 18 is not in point contact, but in line contact, thereby minimizing wear and damage of the distortion hole 18 and preventing damage to the

photosensitive drum protrusions

11 and 11a as consumables. In addition to this, the detachment of the

projections

11 and 11a from the distortion holes 18, which may occur, can be prevented and the printing accuracy can be increased. 2 and 3, the groove 11b is preferably formed in a direction opposite to the rotation direction of the distortion hole 18. The groove 11b is formed at a position opposite to the rotation direction of the distortion hole 18 so that the groove 11b is caught by the inlet of the distortion hole 18 when the driving force is transmitted. This is because the contact form of the

protrusions

11 and 11a appears in line contact. The size of the recess 11b is not particularly limited, but is preferably in the range of about 0.3 to 3 mm in consideration of the typical size of the distortion hole 18.

The size, height and position of the recess 11b, etc. of the

protrusions

10, 11, 11a are determined by the shape and depth of the distortion hole 18, as well as those skilled in the art. As will be appreciated, no further detailed description is given herein.

In addition, the material of the

protrusions

10, 11, 11a is softer and higher in elasticity than the material constituting the distortion hole 18, thereby preventing the damage of the inlet of the distortion hole 18 and changing the life of the photosensitive drum. Damage to the

protrusions

11 and 11a can also be minimized until the damage occurs. In the electrophotographic photosensitive drum of the present invention, the synthetic resin constituting the

protrusions

11 and 11a is not particularly limited, but the main body distortion hole 18 of the image forming apparatus is usually made of a POM material. In consideration of this, the material of the

protrusions

11 and 11a is preferably at least one selected from the group consisting of polyoxymethylene (POM), polyfluoroethylene, and polycarbonate. In addition, the synthetic resin constituting the

protrusions

11 and 11a has a tensile strength of 0.8 to 0.99, an yield elongation of 0.8 to 0.99 times, a flexural modulus of 1.01 to 1.2 times as compared with the material constituting the distortion hole 18, It is preferable that the impact strength has physical properties in the range of 0.7 to 0.99 times. If the physical properties of the synthetic resin constituting the

protrusions

11 and 11a are outside the numerical range, the distortion holes 18 may be deformed or damaged, or the

protrusions

11 and 11a may be severely damaged to cause the photosensitive drum or cartridge to be deteriorated. It may be impossible to fill the life span.

2 is a perspective view showing an example of an electrophotographic photosensitive drum flange 20 and

protrusions

10, 11, 11a according to the present invention. As shown in Fig. 2, in the electrophotographic photo-sensing drum of the present invention, the

protrusions

11 and 11a are formed on the main cylinder 11 at the center and the plurality of portions formed on the periphery of the main cylinder 11; It is preferable that it consists of the cylinder 11a, and it is preferable that the number of the plurality of secondary cylinders 11a is the same as or less than the number of the corner part of the said distortion hole 18. In addition, the plurality of secondary cylinders (11a) is preferably formed symmetrically around the main cylinder (11). In the present specification, the expression of the cylinder refers to a circular tube of a pipe shape in which the upper diameter and the lower diameter are the same as the cylinder itself or the center is empty, and the secondary cylinder formed at the periphery of the main cylinder is the main cylinder and the circumference. May be in abutting or partially overlapping form.

In addition, the protrusions produced in this way have a simple shape, and thus, a mold manufacturing cost and a period of use of the mold are also reduced by about 5% compared to a conventional protrusion, and the mold use durability is extended by 20% to reduce cost. You can do it.

In the electrophotographic photosensitive drum of the present invention, the main cylinder has a through hole having a locking jaw 21 inside the distal end portion, an elastic member 30 positioned inside the through hole, and the elastic member 30. Located at one end of the sleeve 50 is further inhibited by the engaging jaw 21 and electrically connected to the photosensitive drum body and further includes a metal ground portion 40 inserted into the sleeve 50 Can be. FIG. 4 is a partial perspective view of the electrophotographic photosensitive drum according to the present invention further comprising an elastic member 30, a sleeve 50, and a metal ground portion 40 for grounding, and FIG. 5 is a ground of FIG. Is a partial cross-sectional view of the case further comprising an elastic member 30, the sleeve 50 and the metal ground portion 40 for. In the case of the photosensitive drum, the formation of static electricity may be problematic when electrically insulated, so it is desirable to have a grounding structure for removing the photosensitive drum. In the case of the present invention, the metal grounding portion 40 is preferably a metal having excellent electrical conductivity, for example, gold, silver, iron, copper, or an alloy thereof. Brass is a copper alloy in consideration of economical efficiency and durability. . In the embodiment of the present invention, the sleeve 50 and the metal grounding part 40 are manufactured separately to fit both, but it is also possible to manufacture in one piece.

One embodiment of the present invention described above should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims

An electron for forming an image on a recording material having a motor, a drive rotatable member that receives a driving force from the motor, and a distortion hole having a non-circular cross section having a plurality of corner portions formed in a central portion of the drive rotatable member; In the photosensitive drum for electrophotographic image forming for a photographic image forming apparatus,

The electrophotographic photosensitive drum is provided with a cylindrical member having a photosensitive layer on a circumferential surface thereof and at least two cylinders or polygonal cylinders provided at one end of the cylindrical member to receive a driving force from the drive rotatable member. Including a protrusion of the form, the groove is formed in the middle of the protrusion is formed by the projection is inserted into the distortion hole and the groove of the protrusion is fixed to the inlet of the distortion hole when the rotation of the drive rotatable member is rotated and the driving force Photosensitive drum for electrophotographic image formation, characterized in that the transfer.
The method of claim 1,

The projecting photosensitive drum for electrophotographic image formation, characterized in that the protruding portion is composed of a main cylinder of the center and a plurality of secondary cylinders formed on the periphery of the main cylinder.
The method of claim 2,

And the number of the plurality of secondary cylinders is equal to or less than the number of corner portions of the distortion holes.
The method of claim 3,

And said plurality of secondary cylinders are formed symmetrically about said main cylinder.
The method according to claim 3 or 4,

And said groove is formed in said secondary cylinder.
The method of claim 1,

And said groove is formed in a direction opposite to the direction of rotation of said distortion hole as viewed in the engagement direction.
The method of claim 2,

The main cylinder has a through hole having a locking jaw inside the distal end portion, an elastic member positioned inside the through hole, a sleeve positioned at one end of the elastic member to prevent advancement by the locking jaw, and the photosensitive drum body. An electrophotographic photosensitive drum comprising a metal ground portion electrically connected and inserted into the sleeve.
The method of claim 7, wherein

The photosensitive drum for electrophotographic image formation, characterized in that the material of the metal ground portion is brass.
A process cartridge comprising the photosensitive drum for forming an electrophotographic image according to any one of claims 1 to 7.