JP5880290B2 - End member manufacturing method and photoreceptor drum unit manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing an end member provided in a photosensitive drum unit provided in an image forming apparatus such as a laser printer or a copying machine, and a method for manufacturing a photosensitive drum unit.

  Image forming apparatuses such as laser printers and copiers are provided with a photosensitive drum. The photosensitive drum is a member for forming contents such as characters and figures to be transferred to a recording medium such as paper. Such a photosensitive drum is configured such that a photosensitive layer is coated on the outer peripheral surface of a conductive substrate such as aluminum. The type of the photosensitive layer to be coated can be appropriately selected depending on the apparatus to which the photosensitive drum is applied.

  At both ends of the photosensitive drum, end members for holding the photosensitive drum in the image forming apparatus and rotating the photosensitive drum about the cylindrical axis are mounted. Accordingly, the photosensitive drum is disposed in the image forming apparatus as a photosensitive drum unit with end members attached to both ends thereof.

  The end member is attached to the photosensitive drum by inserting a part (fitting portion) of the end member into the inside of the cylindrical photosensitive drum, and the outer surface of the fitting portion and the inner surface of the photosensitive drum. Is fixed by an adhesive. Therefore, the fitting portion of the end member is inserted inside the photoconductive drum, and the end member and the photoconductive drum are fixed by the adhesive.

  Here, there is a problem in adhesiveness such as peeling and durability against load torque (torque strength) in fixing the photosensitive drum and the end member with an adhesive. It is considered that the photosensitive drum unit repeats rotating and stopping, and is also caused by an operating environment in which the photosensitive drum unit is heated during operation, vibration due to transportation, an atmosphere change, and the like. For example, since the thermal expansion coefficients of the end member, the photosensitive drum, and the adhesive are different, the adhesive surface can be destroyed due to a heat shock caused by a thermal load. Some end members also have gears. If the shape is complicated, it is preferable to use a resin with good moldability. There was a problem.

  From this point of view, Patent Document 1 discloses a technique for improving the adhesion between the photosensitive drum and the end member. According to this technique, it is possible to improve the adhesiveness by an anchor effect or the like by providing a groove in advance in the fitting portion of the resin end member at the time of injection molding.

  Also known is a technique of mechanically “crimping” and fixing after inserting an end member into the photosensitive drum.

  Further, Patent Documents 2 and 3 disclose techniques for increasing the adhesive strength by roughening the surface of the fitting portion by shot blasting.

  On the other hand, it is required to reuse the end member from the viewpoint of cost reduction, energy saving, and resource saving.

JP 2001-83838 A US 7747189 JP 2003-255759 A

  However, for example, many reused end members do not have a groove as described in Patent Document 1, and sufficient adhesion strength cannot be obtained if they are bonded as they are.

  In addition, fixing by caulking reduces productivity, and there is a risk that the deflection of the photosensitive drum and the roundness of the end portion of the product may also decrease.

  Although the above-mentioned problems can be solved by the blasting method as described in Patent Documents 2 and 3, a large-scale device for colliding the blasting media is required. Further, there is a possibility that the medium collides with a portion that should not be processed, or the subsequent process is contaminated by dust or the like. Furthermore, a cleaning process for removing the media that has entered the member and a drying process after the cleaning are also required.

  In view of the above problems, it is an object of the present invention to provide a method for manufacturing an end member that can easily improve the adhesion between the end member and the photosensitive drum. In addition, a method for manufacturing a photosensitive drum unit including the same is provided.

  The present invention will be described below. Here, for ease of understanding, reference numerals of the drawings are given in parentheses, but the present invention is not limited to this.

The invention according to claim 1 is a method of manufacturing an end member (20) to be attached to the end of the photoconductive drum (11) of the photoconductive drum unit (10), and one end of the end member. becomes part, comprising the step of incising the outer surface of the fitting portion is a portion to be inserted into the inside of the photosensitive drum (23), the step of placing the switching interrupt, one of the end portions of member It is a manufacturing method of an end member which moves an end member or a tool (50) so that a plurality of cuts may be made simultaneously toward the side.

Invention according to claim 2, in the manufacturing method of the end member according to claim 1 (20), switching interrupt is straight, helical, be carried out in at least one of the zigzag, and discontinuous It is characterized by.

  According to a third aspect of the present invention, there is provided a step of arranging an adhesive on the inner surface of the photosensitive drum (11), and an end portion produced by the production method according to the first or second aspect at a portion where the adhesive is arranged. It is a manufacturing method of the photoreceptor drum unit (10) including the process of inserting and bonding the fitting part of a member (20).

  According to the present invention, since the notch is provided on the outer surface of the fitting portion of the end member, this can retain the adhesive and exert an anchor effect, thereby increasing the adhesive strength. And the process for that can be performed simply compared with the past.

FIG. 1A is an external perspective view of a photosensitive drum unit having an end member. FIG. 1B is an exploded perspective view showing the end member separated from the photosensitive drum. 2A is an external perspective view of the end member, and FIG. 2B is a front view of the end member. The upper part of FIG. 3 is a plan view of the incision forming instrument, and the lower part of FIG. 3 is a III-III sectional view. 4A is a diagram showing one scene of the cut formation, FIG. 4B is a diagram showing another scene of the cut formation following FIG. 4A, and FIG. 4C is FIG. 4B. It is a figure showing the further another scene of the notch formation which continues from. It is a front view of the edge part member of another example. It is a top view of the incision forming instrument of another example. FIG. 7 (a) is a diagram showing one scene of cut formation, FIG. 7 (b) is a diagram showing another scene of cut formation following FIG. 7 (a), and FIG. 7 (c) is FIG. 7 (b). It is a figure showing the further another scene of the notch formation which continues from. It is a figure showing the notch forming instrument of the further another example, Comprising: The upper part of FIG. 8 is a top view of the notch forming instrument, and the lower part of FIG. FIG. 9A is an enlarged view of the blade portion in plan view, and FIG. 9B is an enlarged perspective view of the blade portion.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these embodiments.

FIG. 1 is a diagram illustrating one embodiment, and FIG. 1A is an external perspective view of a photosensitive drum unit 10 including an end member 20. FIG. 1B is an exploded perspective view showing the end member 20 separated from the photosensitive drum 11.
The photosensitive drum unit 10 is mounted on an image forming apparatus such as a laser printer or a copying machine, and characters, graphics, and the like to be transferred to a recording medium such as paper are formed. As can be seen from FIGS. 1A and 1B, the photosensitive drum unit 10 includes a photosensitive drum 11, an end member 20, and a lid member 30. 2A is an external perspective view of the end member 20, and FIG. 2B is a front view of the end member 20.

  The photosensitive drum 11 is a member in which a photosensitive layer is coated on the outer peripheral surface of a cylindrical substrate. The base body is formed of a cylindrical conductive material such as aluminum or aluminum alloy. The photosensitive layer formed on the outer peripheral surface of the substrate is not particularly limited, and a known layer can be applied depending on the purpose. Here, when an aluminum alloy is used as the substrate, the type thereof is not particularly limited, but is a 6000 series, 5000 series, or 3000 series aluminum alloy that is often used as a conductive substrate of a photosensitive drum. It is preferable.

  The substrate can be manufactured by forming a cylindrical shape by cutting, extruding, drawing, or the like. The photosensitive drum 11 can be produced by laminating the photosensitive layer on the outer peripheral surface of the substrate.

The end member 20 is one form of the end member, and is attached to one end of the end portions of the photosensitive drum 11. The end member 20 is a member that receives the rotational driving force from the rotational driving shaft of the image forming apparatus directly or via another member and rotates the photosensitive drum unit 10 itself. Therefore, the end member 20 is provided with a gear portion 21 provided with a gear for transmitting a rotational force. In addition, this rotational force can be transmitted to other rollers (for example, a charging roller) adjacent by the gear.
The end member 20 has a cylindrical shape as a whole, and the end member 20 includes a gear portion 21, a contact wall portion 22, and a fitting portion 23 arranged in the cylindrical axis direction.

  The gear portion 21 is a portion where a gear is formed on the outer peripheral surface of the end member 20, and the rotational driving force from the image forming apparatus main body is transmitted by the gear. Accordingly, the type of gear is not particularly limited, and may be a helical gear or a spur gear. In the present embodiment, an example in which the gear portion is provided is shown, but the end member does not necessarily have to be provided with the gear portion. Further, a gear may be provided on the lid member 30 side described later.

  The contact wall portion 22 is a portion formed to have a larger outer diameter than the fitting portion 23. As can be seen from FIG. 1A, the contact wall portion 22 is arranged so that the end member 20 is mounted on the photosensitive drum 11 and the surface of the contact wall portion 22 contacts the end surface of the photosensitive drum 11. Is done. As a result, the insertion depth of the end member 20 into the photosensitive drum 11 is restricted.

The fitting portion 23 serves as one end of the end member and is inserted into the photoreceptor drum 11 to fix the end member 20 to the photoreceptor drum 11. The fitting portion 23 is inserted inside the photosensitive drum 11, and the end member 20 is fixed to the photosensitive drum 11 by bonding the adhesive disposed on the outer peripheral surface thereof to the inner peripheral surface of the photosensitive drum 11. Is done. Therefore, the outer diameter of the fitting portion 23 is substantially the same as the inner diameter of the photosensitive drum 11 as long as it can be inserted inside the cylindrical shape of the photosensitive drum 11.
When the photosensitive drum unit 10 is provided in a process cartridge mounted on the image forming apparatus, it is necessary to reliably and repeatedly transmit the rotational driving force from the image forming apparatus main body via the gear portion 21. . Therefore, the end member 20 is firmly coupled to the photosensitive drum so as not to drop off or loosen.

As shown in FIGS. 2A and 2B, the fitting portion 23 is provided with a chamfered portion 24 and a cut 25. The chamfered portion 24 is a portion where the outer peripheral corner portion of the end member 20 in the fitting portion 23 is chamfered. This facilitates insertion of the fitting portion 23 into the photosensitive drum 11.
In this embodiment, the cut 25 is a cut provided on the outer peripheral surface of the fitting portion 23 so as to extend in the axial direction of the end member 20. A plurality of cuts 25 are provided at predetermined intervals along the outer periphery of the fitting portion 23. The notch 25 can enhance the anchor effect when the fitting portion 23 and the photosensitive drum 11 are bonded using an adhesive, and can be firmly fixed.
Further, since the cut 25 is formed by a tool as will be described later, a bulge is formed on the edge of the cut 25 during processing. As a result, it becomes difficult for the adhesive to be peeled off, and the fitting to the photosensitive drum itself can be performed firmly (tightly).
In addition, the end member may shrink relatively greatly with respect to the photosensitive drum due to the ambient temperature, or the end member may shrink due to changes over time. The convex bulge can suppress peeling of the adhesive and maintain strong adhesion. In particular, polyacetal resin has a tendency to shrink over time, and the above-mentioned effect due to cutting is remarkable.
The length, number, and depth of the cuts 25 are not particularly limited, but are longer and deeper in nature, and the effect on adhesion is greater when the number is greater.

  Note that a part of the inner side of the cylinder is closed inside the end member 20 in order to enable smooth rotation of the photosensitive drum unit 10, and the shaft of the main body of the image forming apparatus is used here. A receiving hole may be provided.

Such an end member 20 is not necessarily limited, but is preferably formed of a crystalline resin. If it is a crystalline resin, when it is injection-molded using a mold, the flow is good, so the molding processability is good, and it is released from the mold by crystallization and solidification without cooling to the glass transition point. Therefore, productivity can be greatly improved. In addition, the crystalline resin is excellent in heat resistance and solvent resistance, has good friction wear resistance and sliding property, and is also preferable as a material applied to the end member from the viewpoint of rigidity and hardness.
Examples of the crystalline resin include polyethylene, polypropylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, methylpentene, polyphenylene sulfide, polyether ether ketone, polytetrafluoroethylene, and nylon.
Among these, it is preferable to use polyacetal from the viewpoint of moldability.

  However, since the end member can improve the adhesiveness by forming a cut as described later, for example, with respect to the end member related to the reuse not provided with the above-mentioned cut, the end member related to the reuse is not necessarily provided. It is not necessary to be the above crystalline resin.

  Further, the end member 20 may or may not be provided with a groove for improving adhesion. In the case where there is no groove, the improvement in adhesion by cutting is particularly remarkable, but even if a groove is provided, there is an effect of further improving the adhesion.

The lid member 30 is an end member that is attached to the end of the photosensitive drum 11 opposite to the side on which the end member 20 is disposed. The lid member 30 is not provided with a gear portion but is one form of an end member. Therefore, the material is the same as that of the end member 20.
The lid member 30 has a disc-shaped bearing portion 30a and a fitting portion 30b projecting from the surface of the bearing portion 30a to the inside of the photosensitive drum 11 (shown in broken lines in FIG. 1A). And. In the lid member 30, a fitting portion 30 b that fits inside the cylinder of the photosensitive drum 11 and a bearing portion 30 a that is arranged so as to cover one end surface of the photosensitive drum 11 are formed coaxially. Here, the bearing portion 30 a has a disk shape that covers the end surface of the photosensitive drum 11, and includes a portion that receives the shaft. Further, a ground plate made of a conductive material is disposed on the lid member 30, thereby electrically connecting the photosensitive drum 11 and the image forming apparatus main body. Although the example which arrange | positions a ground plate in the cover material 30 was demonstrated in this embodiment, not only this but a ground plate may be arrange | positioned at the edge part member 20 side.
The fitting portion 30b of the lid member 30 may also be provided with a cut similar to the cut 25 described above. As a result, the adhesion of the lid material 30 to the photosensitive drum 11 is also improved.

  The photosensitive drum unit 10 including the end member 20 as described above can be manufactured, for example, as follows. FIG. 3 shows an incision forming instrument 50 used when manufacturing the end member 20. The upper part of FIG. 3 is a plan view of the incision forming instrument 50, and the lower part is a III-III sectional view. FIG. 4 shows the order of the cut formation in FIGS. 4 (a) to 4 (c).

  In this example, when the end member 20 is manufactured, the end member 20 ′ having no notches as shown in FIG. 4A is prepared. Such an end member 20 'may be newly manufactured or may be reused. For a newly manufactured product, the manufacturing method is not particularly limited, and for example, it can be manufactured by injection molding or the like.

  Next, a cut 25 is formed in the end member 20 '. In this embodiment, the notch 25 is formed by the notch forming tool 50. The incision forming instrument 50 will be described with reference to FIG. The incision forming instrument 50 functions as a cutting tool and is an annular plate-like member as a whole. From the inner peripheral surface facing the annular circular portion 53 of the main body 51 and the inner circular cavity portion 53 of the main body 51, A plurality of blade portions 52 projecting toward the center are provided.

  The diameter (inner diameter which is a ring) D1 of the circular cavity 53 is formed larger than the outer diameter of the fitting portion of the end member 20 '. On the other hand, the circular diameter D2 connecting the leading edge of the blade portion 52 is slightly smaller than the outer diameter of the fitting portion of the end member 20 '. Accordingly, the cut 25 can be formed by inserting and pulling the fitting portion of the end member 20 ′ into the circular cavity 53.

A plurality of blade portions 52 are provided so as to protrude from the inner peripheral surface of the main body 51 toward the center of the ring, and are formed to have a blade for cutting the surface of the fitting portion. The number and arrangement may be changed according to the cuts 25 to be formed.
Further, the shape of each blade portion 52 is not particularly limited as long as the appropriate cut 25 can be formed, but when the fitting portion of the end member 20 ′ is inserted into the circular cavity portion 53, the blade portion 52 is fitted. It is difficult to form chips at the joint part, and it is preferable that the notch 25 is formed by being largely cut when the fitting part is pulled out. Thus, the cut 25 is formed by cutting toward one end of the end member 20 as indicated by the arrow II in FIG. Accordingly, the chips during the formation of the cuts are easily cut off, so that it is difficult for the chips to remain on the outer peripheral portion of the fitting portion and to reduce the fitting accuracy.
A specific embodiment for that purpose is as shown in FIG. That is, the blade part 52 is a triangle in plan view. The angle of the blade edge in a plan view (vertical angle of the triangle) is not particularly limited, but is preferably 30 degrees or more and less than 90 degrees. Thereby, the balance between the adhesiveness and the ease of forming the notch can be achieved. On the other hand, in the cross-sectional view of FIG. 3, from the side where the fitting portion of the end member is inserted (the surface side that is the side represented by the surface 51a of the main body 51 in the cross-sectional view of FIG. 3), the opposite side (of FIG. In the cross-sectional view, the tip of the blade portion 52 is inclined (tapered) toward the back surface side, which is the side represented by the surface 51b of the main body 51, so as to approach the center of the ring. That is, the diameter of the circle connecting the blade tips of the blade portion 52 on the back surface 51b side is smaller than the diameter of the circle connecting the blade tips of the blade portion 52 on the front surface 51a side. At this time, it is preferable that the cutting edge portion on the back surface 51b side has a flat portion instead of a tapered shape. Thereby, abrasion and chipping of the blade edge can be suppressed.

  Although the material which comprises the cutting formation instrument 50 is not specifically limited, The various tool steel used for a normal cutting tool and general steel materials can be used.

  Using such a notch forming device 50, the fitting portion of the end member 20 'is inserted into the circular cavity 53 from the surface 51a side as shown in FIGS. 4 (a) and 4 (b). Then, as shown in FIG. 4C, the fitting part 23 is formed with a cut 25 cut by the blade part 52 by pulling out the fitting part.

  Thereby, the end member 20 is manufactured. Here, the example in which the cut 25 is formed by moving the end member 20 has been described. However, the cut may be formed by moving the cut forming tool 50 that is a cutting tool.

  On the other hand, an adhesive is applied to a portion of the inner surface end portion of the photosensitive drum where the fitting portion 23 of the end member 20 is inserted. Here, it is preferable to use a cyanoacrylate-based, polyurethane-based, or acrylic resin-based adhesive. Among these, a cyanoacrylate-based adhesive having a high curing rate is preferable because it is rapidly cured by surrounding moisture.

  Then, the fitting portion 23 of the manufactured end member 20 is inserted into the inside of the photosensitive drum 11. At this time, the contact wall 22 is inserted until it contacts the end surface of the photosensitive drum 11.

  The lid member 30 is fixed to the opposite side of the end of the photosensitive drum 11 from the end to which the end member 20 is attached. A known method can be applied to this. However, as described above, the lid member 30 may also have a notch formed in the fitting portion. In that case, a method similar to the method described here may be used.

In the present invention, since the notch 25 is provided on the outer surface of the fitting portion 23 of the end member 20, this can retain the adhesive and exert an anchor effect, thereby increasing the adhesive strength. And the process for that can be performed simply compared with the past.
Further, by forming the cut 25 as described above, a bulge is formed in a convex shape at the edge of the cut 25 during processing. As a result, it becomes difficult for the adhesive to be peeled off, and the fitting to the photosensitive drum itself can be performed firmly (tightly).
In addition, the end member may shrink relatively greatly with respect to the photosensitive drum due to the ambient temperature, or the end member may shrink due to changes over time. The convex bulge can suppress peeling of the adhesive and maintain strong adhesion. In particular, polyacetal resin has a tendency to shrink over time, and the above-mentioned effect due to cutting is remarkable.
Further, if the cut 25 is formed by cutting toward one end of the end member, the chip is appropriately detached from the fitting portion, so that the chip enters between the fitting portion and the photosensitive drum. Therefore, it is possible to suppress the fitting accuracy and the deterioration of the photoconductor drum due to the above.

In FIG. 5, the front view of the edge part member 120 of another example was shown. In the end member 120, the notch 125 is formed in the fitting portion 123 so as to be inclined with respect to the axial direction of the end member 120. The same effect as that of the end member 20 is obtained by such a cut 125.
Further, the notch 125 of the end member 120 is formed when the notch 125 is pulled out from the posture of inserting the fitting portion into the circular cavity 53 of the notch forming device 50 as shown in FIG. It can be formed by pulling out while rotating around the 120 axis.

  Similarly, spiral or zigzag cuts can be formed by pulling out the end members or changing the method of moving the cut forming device 50.

  FIG. 6 shows a plan view of another example of the incision forming instrument 150. The incision forming instrument 150 functions as a cutting tool, and as can be seen from FIG. 6, the above-described incision forming instrument 50 is divided into two main bodies 151 in the radial direction. When the divided main bodies 151 are combined, it becomes the same as the cutting device 50.

  FIG. 7A to FIG. 7C show the order in which the cuts 25 are formed using the cut forming tool 150. When using the notch forming instrument 150, as shown in FIG. 7A and FIG. 7B, the notch forming instrument 150 is divided and arranged so as to sandwich the fitting part from the outer peripheral surface side of the fitting part. To do. At this time, the incision forming instrument 150 can be directly arranged at a position where the cutting of the incision 25 is started on the outer peripheral surface of the fitting portion. Therefore, it is possible to form the notch 25 more accurately. After the posture shown in FIG. 7 (b), as in the case of using the cutting instrument 50, the fitting portion is pulled out by the blade portion 52 by pulling out the fitting portion as shown in FIG. 7 (c). A cut notch 25 is formed.

  According to this, since the incision forming instrument is divided, it becomes possible to repeat separation and butting of the incision forming instrument in the middle of cutting. In this case, the notch is not formed at the time of separation, and the notch is formed at the time of butting, so that an intermittent form of the notch can be produced. That is, a dot or a broken line-like cut can be formed.

  FIGS. 8 and 9 are views for explaining still another example of the incision forming instrument 250. The upper part of FIG. 8 is a plan view of the incision forming instrument 250, and the lower part is a VIII-VIII sectional view. 9A is an enlarged view of the blade portion 252 in plan view, and FIG. 9B is an enlarged perspective view of the blade portion 252.

  The cutting instrument 250 differs from the cutting instrument 50 in the shape of the blade portion 252. That is, the incision forming instrument 250 functions as a tool and is an annular plate-like member as a whole. From the inner peripheral surface facing the annular plate-like main body 51 and the inner circular cavity 53 of the main body 51, Are provided with a plurality of blade portions 252 protruding toward the center. Therefore, only the shape of the blade portion 252 will be described here.

  A plurality of blade portions 252 are provided so as to protrude from the inner peripheral surface of the main body 51 toward the center of the ring, and are formed to have a blade for cutting into the surface of the fitting portion. The number and arrangement may be changed according to the cuts 25 to be formed.

The shape of the blade part 252 is as follows. In a plan view, the shape is a triangle as can be seen particularly well from FIGS. 9 (a) and 9 (b). The angle of the blade edge in a plan view (vertical angle of the triangle) is not particularly limited, but is preferably 30 degrees or more and less than 90 degrees. Thereby, the balance between the adhesiveness and the ease of forming the notch can be achieved. On the other hand, in the cross-sectional view, as can be seen from the cross-sectional view of FIG. 8 and FIG. 9B, the blade portion 252 is centered in the thickness direction in the thickness direction of the incision forming instrument 250 (end member insertion and extraction direction). It has an arc shape that protrudes most.
As a result, as shown in FIG. 9B, arc-shaped edges are formed.

Also with such an incision forming instrument 250, as shown in FIGS. 4A to 4C, an incision is formed by inserting and withdrawing an end member into the inner circular cavity 53 of the main body 51. be able to.
And according to the above-mentioned blade part 252, it is possible to form the cut so that the blade is bitten so as to push away without removing the material of the end member when cut, as with a cutter knife. Therefore, it is possible to form a cut without generating chips.

In the example, a plurality of cuts in the direction along the axial direction were formed in the fitting portion by the method shown in FIG. 4, and three end members were manufactured. The number of cuts was 14 at equal intervals in the circumferential direction of the fitting portion, the cross section of each cut was V-shaped, the opening angle was 45 degrees, and the depth was 230 μm. The outer diameter of the fitting portion is 28.5 mm, and the material is polyacetal resin.
On the other hand, as a comparative example, three end members having the same conditions as in the example except that no cut was made were also prepared.

  0.1 g of cyanoacrylate adhesive was applied to the fitting part of the end member according to the example and the comparative example, and the cyanoacrylate adhesive was inserted into the photosensitive drum by an aluminum cutting tube and adhered. Then, it was dried at 35 ° C. and 85% humidity for 24 hours or more.

  Torque strength was measured as a test for evaluating adhesion. Specifically, it is as follows. One cycle of 20 ° C. for 2 hours and 40 ° C. for 2 hours is held in a heat cycle in which 5 cycles are repeated. Each strength was measured 5 times. The results are shown in Table 1.

  As can be seen from Table 1, it is understood that the torque resistance strength, that is, the adhesiveness is greatly improved by making the cut.

DESCRIPTION OF SYMBOLS 10 Photosensitive drum unit 11 Photosensitive drum 20 End part member 21 Gear part 22 Contact wall part 23 Fitting part 24 Chamfering part 25 Cut 30 Cover member (end part member)
50 Incision forming tool 51 Body 52 Blade

Claims (3)

A method of manufacturing an end member to be attached to an end of a photosensitive drum of a photosensitive drum unit,
Having a step of cutting into the outer surface of the fitting portion which is one end portion of the end member and is a portion to be inserted inside the photosensitive drum ;
Step to put the previous SL incision, toward the one end side of said end member to move said end member or tool as a plurality of cuts at the same time, the production method of the end member. The method of manufacturing an end member according to claim 1, wherein the cutting is performed in at least one of a linear shape, a spiral shape, a zigzag shape, and a discontinuous shape.   The step of arranging an adhesive on the inner surface of the photosensitive drum, and inserting and fitting the fitting portion of the end member manufactured by the manufacturing method according to claim 1 or 2 into a portion where the adhesive is arranged A process for producing a photosensitive drum unit, comprising the step of:

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