Cylindrical body holder, its manufacturing method and photosensitive drum manufacturing method

Abstract

To provide a cylindrical body supporter capable of preventing a cleaning liquid from remaining when drying a cylindrical body and inexpensively manufactured, a method for manufacturing the same, and a method for manufacturing a photoconductor drum using the supporter.SOLUTION: A supporter 1 includes a plurality of blade parts 2 projecting outward in the radial direction to an axis P and extending in the axial direction. A supporting plate part 4 projecting outward in the radial direction is provided in the lower part of the blade part 2. When upper portions of the plurality of blade parts 2 at a height position of upper end surfaces 4a of the supporting plate parts 4 are regarded as a plurality of blade body parts 3 inserted and arranged into a cylindrical body 30, the upper end surfaces 4a of the supporting plate parts 4 are supporting surfaces 5 for supporting the lower end 30a of the cylindrical body 30 in the state of inserting and arranging the plurality of blade body parts 3 into the cylindrical body 30. The blade part 2 includes a notch 10 opened from the same height position as at least the supporting surface 5 in the outer end surface 3a of the blade body part 3 to a position higher than the height position is formed inward in the radial direction from an opening 11.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cylindrical body holder used to hold a cylindrical body such as a photosensitive drum substrate in an approximately upright position during cleaning, drying, etc., of the cylindrical body, a manufacturing method thereof, and a manufacturing method of a photosensitive drum using the same holder. [Background technology]

[0002] When manufacturing photosensitive drums for electrophotographic devices such as copiers, laser beam printers, and facsimile machines, multiple photosensitive drum substrates are washed and dried while being placed upright on a pallet. The pallet has multiple holders that protrude upward to hold each of the multiple substrates upright (see Patent Documents 1 to 3).

[0003] 14, a conventional holder 101 is inserted into a photosensitive drum substrate 130 from its lower end opening to hold the substrate 130 upright. The holder 101 shown in the figure has a plurality of blade portions 102 that protrude radially outward from an axis P and extend in the axial direction.

[0004] In this holder 101, a receiving plate portion 104 partially projecting radially outward is integrally formed at the lower end of each of the vane plate portions 102. Here, when the upper portions 103 of the upper end faces 104a of the receiving plate portions 104 in the plurality of vane plate portions 102 are defined as the plurality of vane plate main bodies 103 inserted into the base 130 when the base 130 is held upright, the upper end faces 104a of the receiving plate portions 104 are defined as receiving surfaces 105 that receive the lower ends 130a of the base 130 when the plurality of vane plate main bodies 103 are inserted into the base 130.

[0005] This holder 101 has the advantage that the structure of the holder 101 is simple and the holder 101 can be manufactured by resin injection molding, thereby reducing the manufacturing costs of the holder 101. Furthermore, when the base 130 is cleaned while held upright by the holder 101, the cleaning liquid that flows into the base 130 from its upper end opening flows downward between the two vane plate portions 102, 102 that are adjacent to each other in the circumferential direction of the holder 101 and is discharged from the lower end opening of the base 130, which is another advantage that the holder 101 can be cleaned reliably.

[0006] However, in this holder 101, the outer end surface 103a of the blade plate main body 103 is arranged perpendicular to the receiving surface 105 of the receiving plate portion 104, so that a corner portion 106 having an L-shaped cross section is formed between the receiving surface 105 and the outer end surface 103a, and cleaning liquid is likely to accumulate in this corner portion 106 when the base 130 is cleaned.

[0007] Furthermore, when the substrate 130 is held upright by the holder 101, the inner surface 130c of the substrate 130 is positioned vertically adjacent to the corner 106. This creates a narrow gap at the corner 106, surrounded by three surfaces: the outer end surface 103a of the slat body 103, the receiving surface 105, and the inner surface 130c of the substrate 130. Therefore, when cleaning liquid flows into the corner 106 during cleaning of the substrate 130, the surface tension of the liquid causes the liquid to accumulate in the corner 106. This makes it particularly likely that the cleaning liquid will remain in the corner 106 when the substrate 130 is dried. If the cleaning liquid remains, it can stain the lower end 130a of the substrate 130 or the lower end of the inner surface 130c of the substrate 130. Furthermore, to dry and remove the cleaning liquid so that it does not remain in the corner 106, the drying time of the substrate 130 must be extended.

[0008] Therefore, Patent Document 4 (JP 2018-151532 A) proposes a holder in which receiving surface 105 of receiving plate portion 104 and outer end surface 103a of blade plate main body portion 103 are spaced apart in the circumferential direction of the holder. This holder has the advantage that the above-mentioned corner portions 106 are not formed, and residue of cleaning liquid can be suppressed when base body 130 is dried. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 7-333865 [Patent Document 2] Japanese Patent Application Publication No. 2018-105912 [Patent Document 3] Japanese Patent Application Publication No. 2019-109276 [Patent Document 4] Japanese Patent Application Publication No. 2018-151532 Summary of the Invention [Problem to be solved by the invention]

[0010] However, this holder has a more complicated structure than the conventional holder 101, which has the drawback of increasing the manufacturing cost of the holder.

[0011] The present invention has been made in view of the above-mentioned technical background, and its object is to provide a cylindrical body holder that is less likely to leave cleaning liquid behind when a cylindrical body such as a photosensitive drum substrate is dried, and that can be manufactured inexpensively, a manufacturing method for the same, and a manufacturing method for a photosensitive drum using the same holder. [Means for solving the problem]

[0012] The present invention provides the following means.

[0013] 1) A holder for a cylinder to be cleaned with a cleaning liquid, which is inserted into the cylinder from its lower end opening and holds the cylinder in a substantially upright position, The rotor blade includes a plurality of blade portions that protrude radially outward from the axis and extend in the axial direction, A receiving plate portion is provided below the vane plate portion and protrudes radially outward, When upper portions of the plurality of blade plate portions relative to the height position of the upper end surface of the receiving plate portion are a plurality of blade plate main body portions that are inserted and disposed within the cylindrical body when the cylindrical body is held in a substantially upright position, the upper end surface of the receiving plate portion is a receiving surface that receives a lower end of the cylindrical body in a state in which the plurality of blade plate main body portions are inserted and arranged inside the cylindrical body, The blade portion has a notch formed on the outer end surface of the blade main body portion, the notch opening from at least the same height as the receiving surface to a position higher than that height, in a radially inward direction from the opening.

[0014] 2) A holder for a cylindrical body as described in the preceding paragraph 1, wherein the cutout portion opens from a position at least at the same height as the receiving surface on the outer end surface of the blade main body portion to a position 3 mm or more higher than that height position, and is formed 2 mm or more radially inward from the opening.

[0015] 3) A holder for a cylindrical body as described in the preceding paragraph 1 or 2, wherein the upper edge of the notch extends to the outer end surface of the blade main body in a state of being inclined obliquely upward relative to the radially outward direction.

[0016] 4) A holder for a cylindrical body according to any one of the preceding paragraphs 1 to 3, wherein the notch is formed in a state of being dug inward radially from its opening to a position lower than the height position of the receiving surface.

[0017] 5) A method for producing a holder for a cylindrical body according to any one of the preceding items 1 to 4, A manufacturing method of a holder for a cylindrical body, in which notches are formed by additional machining in the vane plate portion of the holder where no notches are formed.

[0018] 6) A method for producing a holder for a cylindrical body according to any one of the preceding items 1 to 4, A method for manufacturing a holder for a cylindrical body, comprising simultaneously carrying out cutting to form notches in the vane plate portion of the holder where no notches are formed, and cutting to remove a worn portion caused by contact between the receiving surface of the holder and the lower end of the cylindrical body.

[0019] 7) A method for manufacturing a photosensitive drum, in which the photosensitive drum substrate is cleaned and dried while being held in a substantially upright position, 5. A method for manufacturing a photosensitive drum, comprising holding a photosensitive drum substrate as a cylindrical body in a substantially upright position by the cylindrical body holder according to any one of items 1 to 4 above. [Effects of the Invention]

[0020] The present invention has the following advantages.

[0021] In the preceding paragraph 1, the blades of the holder have cutouts. Even if cleaning fluid flows into the corners between the receiving surface and the outer end face of the blade body during cleaning of the cylinder, the flowing cleaning fluid passes through the opening of the cutout and flows into the cutout, preventing the cleaning fluid from accumulating in the corners due to the surface tension of the cleaning fluid. This makes it difficult for cleaning fluid to remain when the cylinder is dried, shortening the drying time of the cylinder. Furthermore, the holder's simple structure allows it to be manufactured inexpensively.

[0022] In the above item 2, it is possible to reliably prevent the cleaning liquid from remaining on the cylindrical body when it is dried, and therefore it is possible to reliably shorten the drying time of the cylindrical body.

[0023] In the preceding paragraph 3, the upper edge of the cutout extends to the outer end surface of the blade body at an angle upward relative to the radially outward direction, thereby preventing chipping from occurring in the upper edge of the cutout when the cutout is formed by cutting processing such as lathe processing.

[0024] Furthermore, the cleaning liquid adhering to the upper part of the outer end face of the blade main body flows down along the outer end face, then flows from the outer end face along the upper edge of the cutout portion and into the cutout portion, thereby reliably preventing the cleaning liquid from remaining when the cylinder is dried.

[0025] In the above item 4, it is possible to reliably prevent the cleaning liquid from remaining on the cylindrical body when it is dried, and therefore it is possible to reliably shorten the drying time of the cylindrical body.

[0026] In the above items 5 and 6, the holder can be reliably manufactured at low cost.

[0027] In the above item 7, any of the effects of the above items 1 to 4 can be achieved when manufacturing a photosensitive drum. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic front view of a pallet equipped with a holder for a photosensitive drum substrate (cylinder) according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating the case where the same pallet is used to clean a substrate. [Figure 3] FIG. 3 is a schematic perspective view of the holder. [Figure 4] FIG. 4 shows a plan view (top) and a front view (bottom) of the same holder. [Figure 5] FIG. 5 is a schematic front view of the notch portion of the vane plate portion of the holder and its surroundings. [Figure 6] FIG. 6 is a schematic diagram for explaining an example of a preferred method for producing the holder. [Figure 7] FIG. 7 is a schematic diagram for explaining another example of a preferred method for producing the holder. [Figure 8] FIG. 8 is a schematic front view of the notch and its surroundings, showing a state in which a chip has occurred in the upper edge of the notch when the notch is formed in the blade plate portion of the holder. [Figure 9] FIG. 9 is a schematic front view of the notch portion of the vane plate portion of the photosensitive drum substrate holder according to the second embodiment of the present invention and its periphery. [Figure 10] FIG. 10 is a schematic front view of the notch portion of the vane plate portion of the photosensitive drum substrate holder according to the third embodiment of the present invention and its periphery. [Figure 11] FIG. 11 is a schematic front view of the notch portion of the vane plate portion of the photosensitive drum substrate holder according to the fourth embodiment of the present invention and its periphery. [Figure 12]FIG. 12 is a schematic front view of the notch portion of the vane plate portion of the photosensitive drum substrate holder according to the fifth embodiment of the present invention and its periphery. [Figure 13] FIG. 13 is a schematic front view of the notch portion of the vane plate portion of the photosensitive drum substrate holder according to the sixth embodiment of the present invention and its periphery. [Figure 14] FIG. 14 is a plan view (top) and a front view (bottom) of a conventional photosensitive drum substrate holder. DETAILED DESCRIPTION OF THE INVENTION

[0029] Next, several embodiments of the present invention will be described below with reference to the drawings.

[0030] As shown in Figures 1 and 2, a photosensitive drum substrate 30 holder 1 as a cylindrical body holder according to the first embodiment of the present invention is provided removably in multiple upwardly protruding positions on the upper surface of a horizontally arranged, approximately plate-shaped pallet 20.

[0031] The base 30 is cylindrical and made of metal, specifically, for example, aluminum (including its alloys). The inner diameter of the base 30 is, for example, in the range of 10 to 60 mm, and the thickness is, for example, in the range of 0.5 to 3.0 mm.

[0032] The plurality of substrates 30 are washed and dried together while being held upright on the pallet 20 by the holders 1. Thereafter, a predetermined layer such as a photosensitive layer is formed on the outer surface of each substrate 30 to obtain a photosensitive drum.

[0033] The cleaning of the substrate 30 is carried out by immersing the substrate 30 in a cleaning liquid 41 in a cleaning tank 40 as shown in FIG. 2 while the substrate 30 is held upright by the holder 1, or by showering the substrate 30 with the cleaning liquid, which is not shown.

[0034] The drying of the substrate 30 is carried out by blowing drying air (for example, warm air or hot air) onto the substrate 30 while the substrate 30 is held upright by the holder 1.

[0035] 3 and 4, the holder 1 is inserted into a base body 30 (shown by a two-dot chain line) through its lower end opening 30b to hold the base body 30 upright, and is provided with a plurality of vane plate sections 2 that protrude radially outward from a vertical axis P and extend in the axial direction. In this embodiment, there are four vane plate sections 2, which are spaced at equal intervals around the circumferential direction of the holder 1 and are integrally connected at the position of the axis P.

[0036] At the lower end of each vane plate portion 2 of the holder 1, a receiving plate portion 4 is integrally formed, partially projecting radially outward.

[0037] Here, as shown in Figure 4, the upper portions 3 of the plurality of blade plate portions 2 with respect to the height position h of the upper end surfaces 4a of the receiving plate portions 4 are referred to as the plurality of blade plate main body portions 3 that are inserted and positioned within the base 30 when holding the base 30 in an upright position.

[0038] The outer end surface 3a of each slat body 3 is disposed vertically. The upper end surface 4a of each receiving plate 4 is flat and disposed horizontally, and this upper end surface 4a serves as a receiving surface 5 that receives the lower end 30a of the base 30 when the plurality of slat body parts 3 are inserted and disposed within the base 30.

[0039] 4 and 5, each slat portion 2 has a notch 10 formed in the outer end face 3a of the slat main body 3, the notch 10 extending radially inward from the opening 11, the notch 10 opening from at least the same height position h as the receiving surface 5 to a position higher than the height position h. The opening 11 of the notch 10 is disposed facing the corner 6 between the receiving surface 5 and the outer end face 3a of the slat main body 3, and in this first embodiment, the notch 10 has a substantially U-shaped shape.

[0040] As shown in Figure 5, the lower edge portion 13 of the cutout portion 10 extends horizontally in the radially inward direction, flush with the receiving surface 5 at the same height position h as the receiving surface 5, and the inner edge portion 14 of the cutout portion 10 extends vertically upward from the inner end of this lower edge portion 13, and the upper edge portion 12 of the cutout portion 10 extends straight from the upper end of this inner edge portion 14 to the outer end surface 3a of the slat main body portion 3 in a horizontal radially outward direction.

[0041] The holder 1 of the first embodiment has the following advantages.

[0042] When cleaning the base 30 while it is held upright by the holder 1, the cleaning liquid that flows into the base 30 from its upper end opening flows downward between the two adjacent vane plate portions 2, 2 in the circumferential direction of the holder 1 and is discharged from the lower end opening 30b of the base 130, which has the advantage of ensuring that the holder 1 can be cleaned reliably.

[0043] Furthermore, since the above-mentioned notch 10 is formed in each of the vane portions 2 of the holder 1, the following advantages are obtained.

[0044] That is, when cleaning the substrate 30 while it is held upright by the holder 1, the cleaning liquid that has flowed into the corner 6 between the receiving surface 5 and the outer end face 3a of the blade body 3 flows from the corner 6 through the opening 11 of the cutout 10 and into the cutout 10, thereby preventing the cleaning liquid from accumulating in the corner 6 due to the surface tension. Therefore, when the substrate 30 is dried, the cleaning liquid is less likely to remain, and the drying time of the substrate 30 can be shortened.

[0045] Furthermore, since the structure of the holder 1 is simple, the holder 1 can be manufactured inexpensively.

[0046] Here, "A" in Figure 5 is the height of the opening 11 of the cutout portion 10 from the same height position h as the receiving surface 5, and "B" is the depth of the cutout portion 10 in the radial direction from the opening 11 of the cutout portion 10 (i.e., the outer end surface 3a of the blade main body portion 3).

[0047] A is preferably 3 mm or more, and B is preferably 2 mm or more. That is, the notch 10 preferably opens from at least the same height position h as the receiving surface 5 to a position 3 mm or more higher than the height position h, and further preferably extends 2 mm or more radially inward from the opening 11. This reliably prevents the cleaning liquid from remaining, thereby reliably shortening the drying time of the base 30.

[0048] Next, an example of a preferred method for manufacturing the holder 1 of the first embodiment will be described below with reference to Fig. 6. This figure is a front view of a notch formation portion (shown cross-hatched) 17 of each vane plate portion 2 and its surroundings, showing the state before the notch portion 10 is formed in each vane plate portion 2 of the holder.

[0049] As shown in the figure, first, a holder 1a is manufactured in which no notches are formed in each of the vane plate portions 2. Because this type of holder 1a has a simple structure, it can be manufactured by resin injection molding. By manufacturing the holder 1a by resin injection molding, the manufacturing cost of the holder 1 is reduced.

[0050] Next, the notch portions 10 are formed in each of the vane plate portions 2 of the holder 1a by additional machining. This additional machining is preferably performed by lathe processing using a general-purpose lathe, an NC lathe, or the like. That is, the notch portions 10 are formed in the vane plate portions 2 by turning off the portions 17 where the notches are to be formed in the vane plate portions 2 by lathe processing.

[0051] By manufacturing the holder 1 using the method described above, the holder 1 can be manufactured reliably and inexpensively.

[0052] Next, another example of a preferred method for manufacturing the holder 1 of the first embodiment will be described below with reference to Fig. 7. This figure is a front view of a portion 17 (shown cross-hatched) where a notch is to be formed in each vane plate 2 of the holder, and the surrounding area, showing the state before the notch 10 is formed in each vane plate 2.

[0053] When the base 30 is repeatedly held upright using a holder 1a that does not have a notch 10 formed in each blade portion 2, the lower end 30a of the base 30 repeatedly comes into contact with the receiving surface 5 of the holder 1, resulting in a worn portion 7 on the receiving surface 5.

[0054] For the holder 1a having the worn portions 7 on the receiving surfaces 5 in this way, cutting is simultaneously performed to form the notches 10 in each of the vane plate portions 2 and to remove the worn portions 7 from each of the receiving surfaces 5. This cutting is preferably performed by lathe processing using a general-purpose lathe, NC lathe or the like. That is, the portions 17 on the vane plate portions 2 where the notches are to be formed and the worn portions 7 on the receiving surfaces 5 are simultaneously turned off by lathe processing, thereby forming the notches 10 in the vane plate portions 2 and forming the receiving surfaces 5 into a flat shape at the same time.

[0055] By manufacturing the holder 1 using the method described above, the holder 1 can be manufactured reliably and inexpensively.

[0056] Here, when the cutout portion 10 is formed in the blade portion 2 of the holder 1a by cutting processing such as lathe processing as described above, there is a risk that a chip 18 will occur in the upper edge portion 12 of the cutout portion 10 due to the cutting processing, as shown in Figure 8.

[0057] Therefore, in order to prevent the occurrence of chips 18, it is preferable to form cutout portion 10 in a shape in which its upper side portion 12 is inclined obliquely upward relative to the radially outward direction and extends to outer end surface 3a of slat main body portion 3, as shown in Figures 9 to 11. The shape of cutout portion 10 shown in each figure will be specifically described below.

[0058] In the retaining body 1A of the second embodiment of the present invention shown in Figure 9, the lower edge portion 13 of the cutout portion 10 extends horizontally in the radially inward direction, flush with the receiving surface 5, at the same height position h as the receiving surface 5, and the upper edge portion 12 of the cutout portion 10 extends straight from the rear end of this lower edge portion 13 to the outer end surface 3a of the blade main body portion 3, inclined diagonally upward relative to the radially outward direction.

[0059] In the retaining body 1B of the third embodiment of the present invention shown in Figure 10, the lower edge portion 13 of the cutout portion 10 extends horizontally in the radially inward direction, flush with the receiving surface 5, at the same height position h as the receiving surface 5, and the rear edge portion 14 of the cutout portion 10 extends vertically upward from the rear end of this lower edge portion 13, and the upper edge portion 12 of the cutout portion 10 extends straight from the upper end of this rear edge portion 14 to the outer end surface 3a of the blade main body portion 3, inclined diagonally upward relative to the radially outward direction.

[0060] In the retaining body 1C of the fourth embodiment of the present invention shown in Figure 11, the lower edge portion 13 of the cutout portion 10 extends radially inward from the same height position h as the receiving surface 5, tilting diagonally downward relative to the radially inward direction, and the rear edge portion 14 of the cutout portion 10 extends vertically upward from the rear end of this lower edge portion 13, and the upper edge portion 12 of the cutout portion 10 extends straight from the upper end of this rear edge portion 14 to the outer end surface 3a of the blade board main body portion 3, tilting diagonally upward relative to the radially outward direction.

[0061] Furthermore, in the holders 1A to 1C of the second to fourth embodiments, the upper edge portion 12 of the cutout portion 10 extends to the outer end surface 3a of the blade main body portion 3 while being inclined diagonally upward as described above, which not only suppresses the occurrence of chips 18 due to cutting processing, but also has the following advantages.

[0062] That is, the cleaning liquid adhering to the upper part of the outer end surface 3a of the slat main body 3 flows down along the outer end surface 3a due to the action of gravity. Then, the cleaning liquid that reaches the upper end of the opening 11 of the cutout 10 flows from the outer end surface 3a along the upper side 12 of the cutout 10 into the cutout 10. Therefore, it is possible to reliably prevent the cleaning liquid from remaining when the base 30 is dried.

[0063] Furthermore, in the holder 1C of the fourth embodiment, the notch 10 can also be considered to be formed so as to be dug radially inward from the opening 11 to a position lower than the height position h of the receiving surface 5. In this case, in addition to the advantages described above, the following advantages are also obtained.

[0064] That is, the cutout 10 is formed so as to extend from its opening 11 to a position lower than the height position h of the receiving surface 5, so that when the base 30 is cleaned, the cleaning liquid flows quickly and reliably from the corner 6 through the opening 11 of the cutout 10 into the cutout 10. This quickly and reliably prevents the cleaning liquid from accumulating in the corner 6 due to the surface tension. This has the advantage of further reliably shortening the drying time of the base 30.

[0065] In the retaining bodies 1D and 1E of the fifth and sixth embodiments of the present invention shown in Figures 12 and 13, like the retaining body 1C of the fourth embodiment, the cutout portion 10 is formed so as to be recessed radially inward from its opening 11 to a position lower than the height position h of the receiving surface 5, and therefore has the advantages described above.

[0066] Furthermore, in each of these holders 1D and 1E, the cutout portion 10 is formed in a state in which it is dug down to the lower end position of the vane plate portion 2 at a position lower than the height position h of the receiving surface 5. Therefore, the receiving plate portion 4 is separated from the vane plate portion 2 by the cutout portion 10.

[0067] Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified in various ways without departing from the gist of the present invention.

[0068] Furthermore, in the above embodiment, the cylindrical body is the photosensitive drum substrate 30, but in the present invention, the cylindrical body is not limited to being a photosensitive drum substrate, and may be a cylindrical body other than a photosensitive drum substrate. [Industrial Applicability]

[0069] The present invention can be used for a cylindrical body holder used to hold a cylindrical body such as a photosensitive drum substrate in an approximately upright position during cleaning and drying, and for a method of manufacturing a photosensitive drum. [Explanation of symbols]

[0070] 1: Holding body 2: Blade section 3: Main body of the blade 3a: Outer end surface 4: Receiving plate 5: Receiving surface 6:Corner corner 7: Wear area 10: Notch 11:Aperture 12: Top 20: Palette 30: Photosensitive drum base (cylindrical body)

Claims

1. A cylindrical body holder that is inserted into a cylindrical body to be cleaned with a cleaning liquid from a lower end opening of the cylindrical body and holds the cylindrical body in a substantially upright position, The rotor blade includes a plurality of blade portions that protrude radially outward from the axis and extend in the axial direction, A receiving plate portion is provided below the vane plate portion and protrudes radially outward, When upper portions of the plurality of blade plate portions relative to the height position of the upper end surface of the receiving plate portion are a plurality of blade plate main body portions that are inserted and disposed within the cylindrical body when the cylindrical body is held in a substantially upright position, the upper end surface of the receiving plate portion is a receiving surface that receives a lower end of the cylindrical body in a state in which the plurality of blade plate main body portions are inserted and arranged inside the cylindrical body, The blade portion has a notch portion formed in an outer end surface of the blade plate main body, the notch portion opening from at least a height position equal to the height of the receiving surface to a position higher than the height position, in a radially inward direction from the opening, A cylindrical body holder in which the upper side of the notch extends to the outer end surface of the blade main body while being inclined obliquely upward relative to the radially outward direction.

2. 2. A holder for a cylindrical body according to claim 1, wherein said notch is formed so as to be dug radially inward from its opening to a position lower than the height of said receiving surface.

3. A cylindrical body holder that is inserted into a cylindrical body to be cleaned with a cleaning liquid from a lower end opening of the cylindrical body and holds the cylindrical body in a substantially upright position, The rotor blade includes a plurality of blade portions that protrude radially outward from the axis and extend in the axial direction, A receiving plate portion is provided below the vane plate portion and protrudes radially outward, When upper portions of the plurality of blade plate portions relative to the height position of the upper end surface of the receiving plate portion are a plurality of blade plate main body portions that are inserted and disposed within the cylindrical body when the cylindrical body is held in a substantially upright position, the upper end surface of the receiving plate portion is a receiving surface that receives a lower end of the cylindrical body in a state in which the plurality of blade plate main body portions are inserted and arranged inside the cylindrical body, The blade portion has a notch portion formed in an outer end surface of the blade plate main body, the notch portion opening from at least a height position equal to the height of the receiving surface to a position higher than the height position, in a radially inward direction from the opening, The notch is formed in a state of being dug radially inward from its opening to a position lower than the height position of the receiving surface.

4. The notch portion opens from at least the same height position as the receiving surface on the outer end surface of the blade plate main body to a position 3 mm or more higher than that height position, and is formed 2 mm or more radially inward from the opening. A cylindrical body holder as described in any one of claims 1 to 3.

5. A method for manufacturing a holder for a cylindrical body according to any one of claims 1 to 4, A manufacturing method of a holder for a cylindrical body, in which notches are formed by additional machining in the vane plate portion of the holder where no notches are formed.

6. A method for manufacturing a holder for a cylindrical body according to any one of claims 1 to 4, A method for manufacturing a holder for a cylindrical body, comprising simultaneously carrying out cutting to form a notch in the vane plate portion of the holder where no notch is formed, and cutting to remove a worn portion caused by contact between the receiving surface of the holder and the lower end of the cylindrical body.

7. A method of manufacturing a photosensitive drum, which includes cleaning and drying a photosensitive drum substrate while the substrate is held in a substantially upright position, comprising: A method for manufacturing a photosensitive drum, comprising holding a photosensitive drum substrate as a cylindrical body in a substantially upright position by the cylindrical body holder according to any one of claims 1 to 4.

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