JP5267438B2 - Roller body and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a roller-shape object, capable of achieving high productivity and excellent machining efficiency and easy to correspond to a design change, while accurately forming the shape of both ends of a resin layer, and to provide a roller-shape object possible to be manufactured by this method. <P>SOLUTION: This method of manufacturing a roller-shape object is characterized by having following processes in order: a first machining process for simultaneously forming a first small-diameter part, which has an equal diameter to a step part, a chamfered part adjacent to the first small-diameter part and formed to be gradually narrowed as it comes from the first small-diameter part, and a second small-diameter part adjacent to the chamfered part and having a diameter equal to the minimum diameter of the chamfered part by using a first cutting tool in both ends of a resin layer body of a resin layer body formed intermediate object formed with the resin layer body in a side surface of a metal shaft; and a second machining process for cutting a part of the second small-diameter part, which is separated from the chamfered part, to the metal shaft by using a second cutting tool for cross-machining. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a roller-like body that can be used as a charging roller (conductive member) used in an image forming apparatus such as an electrophotographic copying machine, a laser printer, a facsimile, and the like, and a manufacturing method thereof.

  Conventionally, in electrophotographic apparatus such as a copying machine, a laser beam printer, and a facsimile, a charging member that performs a charging process on an image carrier (photosensitive body) and a transfer that performs a transfer process on toner on the photosensitive body. A conductive member is used as the member.

  Here, a case where a conductive member is used as the charging member will be described.

  FIG. 2A is a schematic view of an electrophotographic image forming apparatus. In the figure, reference numeral 11 denotes an electrostatic latent image carrier (photosensitive member) on which an electrostatic latent image is formed, 12 is a charging member (charging roller) that is placed in contact or close to perform charging processing, and 13 is a laser beam or a document. 14 is a toner carrying member (developing roller) for adhering the toner 15 to the electrostatic latent image on the image carrier, and 16 is a transfer member for transferring the toner image on the photosensitive member to the recording medium 17. (Transfer roller) 18 is a cleaning member (blade) for cleaning the photoconductor after the transfer process. Reference numeral 19 denotes waste toner from which the toner remaining on the photosensitive member is removed by the cleaning member, 20 denotes a developing device, and 21 denotes a cleaning device.

  In FIG. 2A, description of each functional unit normally required in other electrophotographic processes is omitted.

In such an image forming apparatus, an image is formed by the following means.
1. A charging roller charges the surface of the photoreceptor to a desired potential.
2. An exposure device projects image light onto the photoconductor to form an electrostatic latent image corresponding to a desired image on the photoconductor.
3. The developing roller develops the electrostatic latent image with toner and forms a toner image (developed image) on the photoreceptor.
4). The transfer roller transfers the toner image on the photoconductor to the recording paper.
5. A cleaning device cleans the toner that is not transferred and remains on the image carrier.
6). The recording paper onto which the toner image has been transferred by the transfer roller is conveyed to a fixing device (not shown). The fixing device heats and pressurizes the toner to fix it on the recording paper.

  By repeating the above steps 1 to 6, a desired image is formed on the recording paper.

  As a charging method using a charging roller, there is a contact charging method in which a charging roller is brought into contact with a photosensitive member (see JP-A 63-149668, JP-A 1-21179, JP-A 1-267667, etc.). . However, such a contact charging method has the following problems.

1. Adhesion of the charging roller mark on the image carrier (occurs because substances constituting the charging roller ooze out from the charging roller and migrate to the surface of the object to be charged) (the image formed is the rotation period of the charging roller) An abnormal image and the life of the image forming apparatus is shortened).
2. Generation of charging noise (occurs because the charging roller in contact with the object to be charged vibrates when an AC voltage is applied to the charging roller) (used to generate high-frequency noise in offices where quietness is required) Can not).
3. Deterioration of conductive performance due to adhesion of toner on photoreceptor to charging roller (especially toner adhesion is more likely to occur due to the above-mentioned oozing out). And the life of the image forming apparatus is shortened).
4). Adhesion of the substance constituting the charging roller to the photosensitive member (the formed image has the background stain, the density unevenness is abnormal, and the life of the image forming apparatus is shortened).
5. Permanent deformation of the charging roller that occurs when the photosensitive member is stopped for a long time (the formed image becomes a black stripe over the contact width and the life of the image forming apparatus is shortened).

  As a method for solving such a problem, a proximity charging method in which a charging roller is brought close to a photoreceptor has been devised (Japanese Patent Laid-Open Nos. 3-240076, 4-358175, and 5-107871). Etc.). The photosensitive member is charged by applying a voltage to the charging roller so that the closest distance (gap, gap) between the charging roller and the photosensitive member is 50 to 300 μm. In this proximity charging method, the charging device and the photoconductor are not in contact with each other, which causes a problem with the contact charging device, such as “adhesion of a substance constituting the charging roller to the photoconductor” “when the photoconductor is stopped for a long time. No problems such as “permanent deformation” occur. In addition, regarding the “deterioration of charging performance due to adhesion of toner or the like on the photosensitive member to the charging roller”, the proximity charging method is excellent because less toner adheres to the charging roller.

  Here, FIG. 2B schematically shows a state in the vicinity of the charging roller 101 and the image carrier (photosensitive member) 61 of the proximity charging method.

  The charging roller 101 has a cylindrical conductive resin layer (electric resistance adjusting layer) 105 formed around the metal shaft 106, and the surface is protected by a non-conductive protective layer 106. Both ends of the conductive resin layer 105 have a large diameter due to the gap holding member 103. The bearing 107 of the charging roller 101 is urged toward the image carrier 61 by a compression spring 108, but only the gap holding member 103 is in contact with the image carrier 61, and the minute gap G is connected to the protective layer 106. Held between.

  Here, JP-A-3-240076 and JP-A-4-358175 disclose a method of providing a spacer ring layer at both ends of a roller as means for holding a gap between the charging roller and the photosensitive member. Yes.

  However, these publications do not describe specific means for precisely setting the gap, and the gap varies due to variations in the dimensional accuracy of the charging roller and the spacer ring. As a result, the charged potential of the photosensitive member becomes uniform. It has a defect that it fluctuates.

  Here, in Japanese Patent Laid-Open No. 2001-296723, these problems are solved by a tape-shaped gap holding means having a predetermined thickness. However, there is a problem that the gap between the photosensitive member and the charging roller cannot be maintained in a long-term use due to the abrasion of the tape-like member, the fixing of the toner due to the protrusion of the tape adhesive, and the like. Further, due to variations in the thickness of the tape and the adhesive layer, it is not possible to form a highly accurate gap.

  Therefore, in the technique described in Japanese Patent Application Laid-Open No. 2005-024830, as shown in FIG. 2, cap-shaped gap holding members made of insulating resin are provided at both ends (small diameter portions) of the resistance adjustment layer made of conductive resin. It has a covered structure. The configuration (relationship) between the resistance adjustment layer and the gap holding member is such that the gap holding member is formed at the ends of the small-diameter portions provided at both ends of the resistance adjustment layer, and the gap holding member corresponds to each end face of the resistance adjustment layer. And it is in contact with the conductive support as a cored bar. Furthermore, in order to improve long-term reliability, the gap holding member can be securely fixed by interposing an adhesive between the gap holding member and the conductive support. Has a large difference in linear expansion coefficient between the gap holding member (resin) and the conductive support (metal), so that the interface between the conductive support and the gap holding member in a low temperature or high temperature environment. Therefore, the reliability over a long period is slightly inferior. Moreover, the adhesive strength by an adhesive agent also falls by brittle fracture by long-time use (energization).

  Here, if the gap holding member moves when it is used as a charging member in the image forming apparatus, the gap distance fluctuates, so that uneven charging tends to occur, and good image formation cannot be performed at this time. When it is necessary to make the gap particularly accurate, it can be achieved by combining the resistance adjusting layer and the gap forming member and then simultaneously grinding or machining such as cutting. Sometimes, if the gap holding member is not sufficiently fixed, the gap forming member rotates relative to the resistance adjusting layer, and high-precision processing cannot be performed. In order to prevent such rotation, it is necessary to more firmly fix the gap holding member to the resistance adjustment layer using an adhesive.

  The gap holding member and the electric resistance adjusting layer are formed of different materials in consideration of the toner fixing property.

  Since an ionic conductive agent is used as a resistance adjusting agent for the electric resistance adjusting layer, the water absorption is high, and at high temperature and high humidity, the electric resistance adjusting layer absorbs moisture and dimensional variation occurs.

  On the other hand, the gap retaining member is preferably an olefin material because it is required to have insulating properties and toner adhesion resistance, and since such an olefin material is a low water absorption material, the gap is held in the electric resistance adjusting layer. Compared to this, there was a problem that the amount of dimensional fluctuation at high temperature and high humidity was small, and the gap (step) formed with high accuracy was fluctuated by environmental fluctuation.

  For this purpose, in the technique described in Japanese Patent Application Laid-Open No. 2006-330483 (Patent Document 1), a narrow diameter portion is formed at both ends of the electric resistance adjusting layer, and a cap-shaped gap holding member is fitted to the narrow diameter portion (press-fit). Technology has been proposed. In this configuration, since the outer diameter of the adjustment layer of the gap holding material follows the thermal expansion of the electric resistance adjustment layer, the change in the gap between the electric resistance adjustment layer and the gap holding member is effectively suppressed. .

  Here, as the shape of both ends of the electric resistance adjusting layer, it has a smaller diameter than the main portion (center portion) of the electric resistance adjusting layer, and the end of the small diameter portion has a chamfered shape. (Because of the chamfered shape, fitting of the cap-shaped gap holding member is facilitated, and damage to the end of the gap holding member, which causes the gap accuracy to decrease, is prevented in advance. 3) and an end face shape (perpendicular or nearly perpendicular to the axis of the core metal) must be processed with high accuracy and efficiency.

  Here, a conventional method for manufacturing a roller-shaped body will be described with reference to FIG.

  FIG. 3A shows a resin layer body portion formed intermediate in which a resin layer body portion 8 is formed on the side surface of the metal shaft 1 by a resin layer forming step such as injection molding, extrusion molding, or transfer molding of a conductive resin composition. FIG.

  In this example, the metal shaft 1 has a thick central portion to improve rigidity, and the resin layer main body 2 is prevented from being displaced from the metal shaft 1. Further, a runner 8f at the time of molding is connected to the right side of the resin layer main body 8 in the figure.

  FIG. 3B is a model diagram showing a state after machining, and a diameter corresponding to the inner diameter of the cap-shaped member, which is smaller in diameter than the central portion 8a through the step portions 8b at both ends of the resin layer main body portion 8. The chamfered portion 8d is provided so that the narrow-diameter portion 8c having the cap 3 and the cap 3 can be smoothly fitted together, and the end surface 8e is a surface substantially perpendicular to the metal shaft 1.

  Conventionally, such machining has been performed as shown in FIG.

  That is, the small diameter portion 8c, the chamfered portion 8d of the resin layer main body portion 8 and the bite provided with the small diameter portion corresponding portion 9a, the chamfered portion corresponding portion 9b, and the shaft corresponding portion 9c corresponding to the metal shaft 1, respectively. Use lathe 9 to turn both ends. After the processing, the portion 8g of the resin layer main body 8 on the right side in the drawing including the runner 8f is cut off from the resin layer main body 8 so that it can be removed by shifting in the direction of the arrow in the drawing.

  FIG. 3D shows a state in which the cap 3 is fitted to the right end of the resin layer body 8 in the drawing. The outer diameter of the cap 3 is thicker than the central portion 8a of the resin layer main body portion 8, and the inner diameter of the cap 3 is slightly smaller than the diameter of the narrow diameter portion 8c of the resin layer main body portion 8 and is an interference fit.

  When such machining is performed, it is required that the precision in the machining depth direction of the small diameter portion corresponding portion 9a and the shaft corresponding portion 9c of the cutting tool 9 is high, and the cutting tool itself is new each time the design is changed. Is required, leading to increased costs.

  Here, the present invention provides a method for manufacturing a roller-shaped body that can achieve high productivity, good processing efficiency, and can easily cope with a design change while accurately forming the shape of both ends of the resin layer. An object of the present invention is to provide a roller-like body that can be manufactured in this manner.

  According to the method for producing a roller-shaped body of the present invention, as described in claim 1, a cylindrical resin layer is provided coaxially with the metal shaft on the metal shaft, and both end portions of the resin layer are compared to the central portion thereof. And the thickened portion has stepped portions at both ends of the resin layer main body portion, which is smaller in diameter than the central portion of the cylindrical resin layer main body portion. In the manufacturing method of the roller-shaped body configured by fitting cap-shaped members to the small-diameter portions provided via the resin, (a) the resin layer body portion in which the resin layer body portion is formed on the side surface of the metal shaft At both ends of the resin layer body portion of the formed intermediate, a first small diameter portion having a diameter equal to the stepped portion, a chamfered portion adjacent to the first small diameter portion and gradually narrowing from the first small diameter portion And a second small-diameter portion adjacent to the chamfered portion and having a diameter equal to the minimum diameter of the chamfered portion is formed as the first small-diameter portion. Simultaneously using a first cutting tool comprising a first narrow-diameter portion forming portion, a chamfered portion-forming portion that forms the chamfered portion, and a second small-diameter portion-forming portion that forms the second small-diameter portion. A first machining step to be formed; and (b) a second machining step of cutting a portion of the second small diameter portion away from the chamfered portion to the metal shaft by using a second cutting tool. And a roller-like body manufacturing method characterized by comprising:

  According to a second aspect of the present invention, there is provided a method for manufacturing a roller-shaped body according to the second aspect, wherein the plurality of resin layer main body formed intermediates are processed in the first aspect. Sequentially using a first processing machine having one cutting tool and a second processing machine having the second cutting tool, and using the first processing machine, the first processing step includes The second resin layer main body formed intermediate is performed using the second processing machine, and at the same time, the next resin layer main body formed using the first processing machine. A method of manufacturing a roller-like body, wherein the first processing step of the intermediate body and the simultaneous execution of the first processing step and the second processing step are sequentially repeated.

  As described in claim 3, the roller-shaped body of the present invention is provided with a cylindrical resin layer coaxially with the metal shaft on the metal shaft, and both end portions of the resin layer are larger in diameter than the central portion thereof. And a roller-shaped body in which the portion having the large diameter is configured by fitting cap-like members to both ends of the cylindrical resin layer main body portion, At both ends of the central portion, a first narrow diameter portion having a diameter smaller than that of the central portion via a step portion and having a diameter corresponding to the inner diameter of the cap-shaped member, the first small diameter portion is adjacent to the first small diameter portion. A roller-like body characterized in that a chamfered portion gradually narrowing from a diameter portion and a second narrow-diameter portion adjacent to the chamfered portion and having a diameter equal to the minimum diameter of the chamfered portion are provided. is there.

  The method for producing a roller-shaped body according to the present invention is as follows: (a) At both ends of the resin layer main body formed intermediate body in which the resin layer main body is formed on the side surface of the metal shaft, the step is equal to the step. A first narrow-diameter portion having a diameter, a chamfered portion adjacent to the first small-diameter portion and gradually narrowing from the first small-diameter portion, and a diameter adjacent to the chamfered portion and equal to the minimum diameter of the chamfered portion. The second small diameter portion includes a first small diameter portion forming portion that forms the first small diameter portion, a chamfered portion forming portion that forms the chamfered portion, and a second thin diameter that forms the second small diameter portion. A first machining step that is simultaneously formed using a first cutting tool composed of a diameter forming portion; and (b) a second cutting tool for cutting off from the chamfered portion of the second small diameter portion. A second processing step of cutting the cut portion up to the metal shaft, and sequentially having the resin layer main body portion Roller shape that can achieve high productivity and good machining efficiency because it can prevent the generation of burrs and chips while preventing the generation of burrs and chips while forming the edge shape with high accuracy. Even when applied to the manufacture of a charging member, it is possible to prevent the possibility that a predetermined performance cannot be obtained and an image abnormality occurs.

  According to the method for manufacturing a roller-like body according to claim 2, the second layer is formed on the resin layer main body formed intermediate body on which the first processing step is performed using the first processing machine. At the same time as performing the second processing step using a processing machine, the first processing step of the next resin layer body portion formed intermediate is performed using the first processing machine, that is, the High productivity can be obtained by sequentially repeating the simultaneous execution of the first processing step and the second processing step.

  The roller-shaped body of the present invention is a roller-shaped body that is easy to manufacture and highly accurate.

It is a model figure which shows the manufacturing method of the manufacturing method of the roller-shaped body which concerns on this invention. FIG. 1A is a diagram showing a first processing step. FIG. 1B is a diagram showing a second processing step. FIG. 2A is a schematic view of an electrophotographic image forming apparatus. FIG. 2B is a diagram schematically illustrating a state in the vicinity of the charging roller 101 and the image carrier (photosensitive member) 61 of the proximity charging method. It is a model figure which shows the manufacturing method of the manufacturing method of the roller-shaped body which concerns on a prior art. FIG. 3 (a) is a model diagram showing the resin layer main body formed intermediate. FIG. 3B is a model diagram showing a state during machining. FIG. 3C is a model diagram showing a state in which the cap 3 is fitted on one side. FIG. 3D is a model diagram showing a state in which the cap 3 is fitted to the right end of the resin layer main body 8 in the drawing. It is a model figure which shows that a burr | flash generate | occur | produces when parting off into the chamfer part 2d.

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

  First, a cylindrical resin layer body is formed on the side surface of the metal shaft by injection molding, extrusion molding, transfer molding, or the like (resin layer forming step). At the time of injection molding, a metal shaft is inserted to form a cavity together with a mold, a resin is introduced into this cavity, and a resin layer body portion formed intermediate body in which a resin layer body portion is formed on the side surface of the metal shaft is formed. . When forming the charging roller, the cylindrical resin layer body 2 is formed of a conductive resin mixed with an ionic conductive agent or the like.

  Next, as shown in FIG. 1A, both ends of the metal shaft are set on a processing machine (a lathe in this example) (chucked by the collet chuck 5), and then the first processing step is performed while rotating.

  That is, using a cutting tool 4a in the vicinity of both ends of the resin layer body 2, the cap-shaped member is smaller in diameter than the center of the resin layer body 2 via the step 2b at both ends of the center of the resin layer body. A first chamfered portion 2c having a diameter corresponding to the inner diameter of the first chamfered portion 2c, a chamfered portion 2d adjacent to the first capped portion 2c and gradually narrowing from the first creviceed portion 2c, and a chamfered portion 2d adjacent to the chamfered portion 2d. A second small diameter portion 2e having a diameter equal to the minimum diameter is simultaneously formed. At this time, since the second small-diameter portion 2e does not reach the side surface of the metal shaft 1, the amount of protrusion of the cutting tool 4a is small. Therefore, the machining is completed in a shorter time than when reaching the side surface of the metal shaft 1 (prior art). To do. The cutting tool 4a (first cutting tool) includes a first narrow-diameter portion molding portion 4a1 that forms the first narrow-diameter portion 2c, a chamfered portion forming portion 4a2 that forms the chamfered portion 2d, and the second thin-walled portion. A second narrow diameter portion forming portion 4a3 that forms the diameter portion 2e is formed.

  Next, the second processing step is performed. At this time, by using a processing machine (second processing machine) different from the processing machine (first processing machine) used above, the processing machine used above ( In the first processing machine, the first processing step of the next resin layer main body formed intermediate can be performed.

  In the second machining step, a part of the second small diameter part 2e away from the chamfered part 2d is cut using a parting tool (second tool) 4b until reaching the side surface of the metal shaft 1 (parting process). The time required for this processing is short and sufficient as compared with the case of processing an unprocessed portion because only the portion that has been thinly processed in the first processing step is processed again.

  In this way, the processing of the plurality of resin layer main body formed intermediates is sequentially performed using the first processing machine including the first tool and the second processing machine including the second tool. At the same time as performing the second processing step using the second processing machine on the resin layer main body formed intermediate body on which the first processing step has been performed using the first processing machine. , Performing the first processing step of the next resin layer main body formed intermediate by using the first processing machine, sequentially repeating the first processing step and the second processing step. Therefore, compared with the prior art in which processing is performed with one processing machine, the present invention is divided into two steps, the first processing step and the second processing step, as described above, and at that time, different processes are performed. By using machines sequentially, productivity at the time of multiple sequential manufacturing is improved. It can gel.

  Further, with respect to the cutting tool to be used, the cutting with the cutting tool 4a in the first processing step only needs to ensure the accuracy of the thickness of the first small diameter portion, and the cutting with the cutting tool 4b in the second processing step is a so-called parting process. Yes, it does not affect the accuracy of the first small diameter portion. Furthermore, even when the design dimension of the thickness of the first small diameter portion is changed, by adjusting only the moving amount of the cutting tool 4a in the first machining step, the change in the thickness of the metal shaft However, it can be easily handled by adjusting only the amount of movement of the cutting tool 4b in the second processing step. Thus, maintaining the dimensional accuracy of these tools is less expensive than using tools used in the conventional method, and can flexibly cope with changes in design dimensions.

  Further, in the second machining step, by cutting the portion of the second small diameter portion 2e away from the chamfered portion 2d, the occurrence of the flash 6 that occurs when the chamfered portion 2d is cut as shown in FIG. It is possible to prevent the workpiece from being damaged by the flash in advance, and a high-quality product can be manufactured with a high yield.

  Examples are shown below.

  Both the first processing step and the second processing step were performed as follows.

  Both ends of a metal shaft (work) having a cylindrical resin layer main body formed on the side surface are chucked by a collet chuck of a processing device (automatic lathe) and processed while being rotated by a DC motor.

  The turret to which the first tool or the second tool is fixed operates in a cutting direction with respect to the work by a single-axis driving mechanism, and is driven by a motor by driving a ball screw. The tool post is installed at both ends of the work longitudinal side, and has an XY stage that can adjust the cutting dimension and the dimension in the thrust direction.

  In this processing apparatus (automatic lathe), workpiece chucking, spindle rotation, cutting, tool return to origin, spindle stopping, and workpiece unchucking are performed automatically.

  Chips generated during processing are long chips that are continuous with respect to the cutting feed, and a dust collection port for suction processing is provided in the vicinity of the cutting position.

  The spindle speed of such a processing apparatus was set to 1000 rpm, and the cutting speed of the cutting tool was set to 1 to 2 mm / second, and machining was performed with the first processing machine.

  Resin mainly composed of ABS resin to which conductivity is added by mixing polymer type ion conductive material (polyether, ester, amide) by injection molding on the side surface of metal shaft with thickness (diameter) of 8mm near both ends A cylindrical conductive resin layer (outer diameter: 13.5 mm) was formed to obtain an intermediate (work) for the charging roller.

  Both ends of this intermediate body are used as a first processing step, and a first narrow diameter portion having an outer diameter of 11.5 mm and a width of 4.2 mm, a chamfered portion having a width of 0.3 mm, an outer diameter of 10.9 mm, and a width of 1.7 mm. The two small diameter portions were each processed using the first processing machine to which the first bit was attached.

  Next, the processed product at the end of the first processing step is set in the second processing apparatus to which the second cutting tool is attached, and 0.5 to 1.2 mm from the chamfered portion of the second small diameter portion as the second processing step. The range was cut to the metal axis (parting off). At the same time, the first processing machine performed the first processing step on the next workpiece, and this was sequentially repeated.

  10 machined semi-finished products for the charging roller were obtained in this way, and provided with the small-diameter portion corresponding portion 14a, the chamfered portion corresponding portion 14b, and the shaft corresponding portion 14c shown in FIG. Only about 57% of the time was required as compared to the time when 10 semifinished products for the charging roller were processed when both ends were turned using the cutting tool 14. Further, there was no damage to the semi-finished product due to wrapping of the flash or flash during processing.

DESCRIPTION OF SYMBOLS 1 Metal shaft 1a Mold pattern shaping | molding surface 2 Resin layer main-body part 2b Step part 2c 1st small diameter part 2d Chamfer 2e 2nd small diameter 4a 1st cutting tool 4a1 1st small diameter molded part 4a2 Chamfer formation Part 4a3 second narrow diameter part forming part 4b second bite

JP 2006-330483 A

Claims (3)

A cylindrical resin layer is provided on the metal shaft coaxially with the metal shaft, and both end portions of the resin layer have a larger diameter than the central portion, and the portions having the large diameter are A cap-shaped member is fitted to each of the small diameter portions provided via the stepped portions at both ends of the resin layer main body portion having a smaller diameter than the central portion of the cylindrical resin layer main body portion. In the manufacturing method of the roller-shaped body currently being performed,
(A) a first thin-diameter portion having a diameter equal to that of the step portion at both ends of the resin layer main body portion of the intermediate formed with the resin layer main body portion formed on the side surface of the metal shaft; A chamfered portion adjacent to one small diameter portion and gradually narrowing from the first small diameter portion; and a second small diameter portion adjacent to the chamfered portion and having a diameter equal to the minimum diameter of the chamfered portion. A first narrow portion forming portion that forms a small diameter portion, a chamfered portion forming portion that forms the chamfered portion, and a second small diameter portion forming portion that forms the second small diameter portion. A first processing step that forms simultaneously using a cutting tool;
(B) a second machining step of cutting a portion of the second small diameter portion away from the chamfered portion by using a second cutting tool for cutting off until reaching the metal shaft;
A method for producing a roller-like body, comprising: In the manufacturing method of the roller-shaped body according to claim 1,
A plurality of resin layer main body formed intermediates are sequentially processed using a first processing machine having the first cutting tool and a second processing machine having the second cutting tool, and
At the same time as performing the second processing step using the second processing machine on the resin layer main body formed intermediate that has been subjected to the first processing step using the first processing machine, The first processing step of carrying out the first processing step of the next resin layer main body formed intermediate using the one processing machine is performed, and the simultaneous execution of the first processing step and the second processing step is sequentially repeated. A method for producing a roller-shaped body. A cylindrical resin layer is provided on the metal shaft coaxially with the metal shaft, and both end portions of the resin layer have a larger diameter than the central portion, and the portions having the large diameter are In the roller-shaped body configured by fitting cap-shaped members to both ends of the cylindrical resin layer main body,
At both ends of the central portion of the resin layer main body portion, a first narrow diameter portion having a diameter smaller than the central portion and corresponding to the inner diameter of the cap-shaped member via a stepped portion is provided on the first thin diameter portion. A chamfered portion which is adjacent and gradually narrows from the first chamfered portion, and a second small diameter portion which is adjacent to the chamfered portion and has a diameter equal to the minimum diameter of the chamfered portion are provided. Roller-like body.

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