JP2011121683A - Method of manufacturing carrying roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a carrying roller for manufacturing the carrying roller which hardly causes a carrying failure. <P>SOLUTION: The method of manufacturing the carrying roller includes a bending work step of bending a metal plate so that a pair of opposed end sides of the metal plate exist close to each other or abut on each other to form a cylinder body 16, and a polishing step of polishing the outer peripheral face of the cylinder body 16 in the state that a core member CR is arranged inside the cylinder body 16 formed in the bending work step. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a transport roller.

  2. Description of the Related Art Conventionally, a printing apparatus that prints information on a sheet-like recording medium has been used, and the printing apparatus is provided with a conveyance unit that conveys the recording medium. The transport unit includes a transport roller that transports the recording medium by rotating. A solid bar-like member is generally used for the transport roller. On the other hand, solid materials have the problem of increasing weight and cost.

  Here, Patent Document 1 describes a technique of bending a metal plate to form a cylindrical shape.

JP 2006-289596 A

  However, different internal stresses are generated in the joint portion of the cylindrical shaft described in Patent Document 1 and other portions of the cylindrical shaft. Due to the difference in internal stress, the cylindrical shaft may be deformed, for example, the cylindrical shaft is curved along the seam. If centerless machining is performed with the cylindrical shaft still deformed, there will be a difference in the amount of cutting between the longitudinal end and the central portion of the cylindrical shaft, resulting in uneven thickness of the cylindrical body after polishing. There is a risk of becoming. In this case, due to thermal expansion that occurs in the heating process after polishing, etc., the cylindrical body may be deformed in a biased manner, and if it is considered to use the cylindrical shaft as a transport roller, it may cause a transport failure. There is.

  In view of the circumstances as described above, an object of the present invention is to provide a method for manufacturing a transport roller that manufactures a transport roller that is less likely to cause a transport failure.

  The method for manufacturing a transport roller according to the present invention includes a bending process for forming a cylindrical body by bending the metal plate so that a pair of opposing edges of the metal plate are close to or in contact with each other, and the bending process And a polishing step of polishing an outer peripheral surface of the cylindrical body in a state where a core member is disposed inside the cylindrical body formed in step (1).

  According to the present invention, in the polishing step, it is possible to suppress the cylindrical body from being polished while being curved, by polishing the outer peripheral surface of the cylindrical body with the core member disposed inside the cylindrical body. Since the entire outer peripheral surface of the cylindrical body is polished almost uniformly, the thickness of the cylindrical body is uniformly formed. Thereby, the conveyance roller which is hard to generate | occur | produce a conveyance defect can be manufactured.

The manufacturing method of said conveyance roller arrange | positions the said core member so that the inside of the said cylindrical body may be penetrated at the said grinding | polishing process.
According to the present invention, since the core member is disposed so as to penetrate the inside of the cylindrical body, the inside of the cylindrical body is supported by the core member over the entire area between the bottom surfaces. Thereby, a curve is suppressed over the whole cylindrical body.

The method for manufacturing the transport roller is characterized in that, in the polishing step, a core member that is formed in a cylindrical shape or a columnar shape and has an outer diameter equal to the inner diameter of the cylindrical body is used as the core member.
According to the present invention, since the core member that is formed in a cylindrical shape or a columnar shape and has an outer diameter equal to the inner diameter of the cylindrical body is used, the core member and the entire inner peripheral surface of the cylindrical body are in close contact with each other. It will be. Thereby, the curvature of a cylindrical body can be suppressed more reliably.

In the method for manufacturing the transport roller, in the polishing step, the polishing member is rotated with the outer peripheral portion of the cylindrical or columnar polishing member in contact with the outer peripheral surface of the cylindrical body. Thus, the outer peripheral surface is polished.
According to the present invention, the outer peripheral surface of the polishing member formed in a cylindrical or columnar shape is brought into contact with the outer peripheral surface, and the outer peripheral surface is polished by rotating the polishing member. It can polish efficiently.

In the manufacturing method of the transport roller, in the bending process, the metal plate is bent so as to be wound around a shaft member to form the cylindrical body, and in the polishing step, the core member is used as the shaft member. It is characterized by.
According to the present invention, in the bending process, the metal plate is bent so as to be wound around the shaft member to form the cylindrical body, and in the polishing process, the core member is used as it is as the shaft member. The operation of arranging the can be omitted. Thereby, the manufacturing process of a conveyance roller can be simplified. In addition, in the state where the metal plate is wound around the shaft member, the cylindrical body is formed in a state where the metal plate and the shaft member are in close contact with each other, so that the bending of the cylindrical body can be more reliably suppressed.

The manufacturing method of said conveyance roller further includes the heating process which heats the said cylindrical body after the said grinding | polishing process.
According to the present invention, since the thickness of the cylindrical body is uniformly formed in the polishing step, the internal stress is uniformly generated with respect to the cylindrical body when the cylindrical body whose outer peripheral surface is polished is heated. Become. Thereby, the deformation | transformation of the cylindrical body by heating, etc. can be avoided.

The manufacturing method of said conveyance roller further includes the core member removal process which removes the said core member from the inside of the said cylindrical body after the said grinding | polishing process, and the said heating process is performed after the said core member removal process. Features.
According to the present invention, since the heating step is performed after the core member is removed from the inside of the cylindrical body, it is possible to avoid the cylindrical body from being affected by the thermal deformation of the core member.

1 is a side sectional view of an ink jet printer according to the present invention. (A) is a top view of a conveyance unit part, (b) is a side view of a drive system. It is a schematic block diagram of a conveyance roller mechanism. It is a schematic block diagram of the manufacturing apparatus of the conveyance roller which concerns on this embodiment. It is process sectional drawing of the extraction process which concerns on this embodiment. It is process sectional drawing of a forging process same as the above. It is a top view of the metal plate after the forge process which concerns on this embodiment. (A)-(c) is process drawing of the bending process which concerns on this embodiment. (A)-(c) is process drawing of the bending process which concerns on this embodiment. It is process drawing of the centerless grinding | polishing process which concerns on this embodiment. (A) The perspective view of a roller main body, (b) is a sectional side view of a joint. (A)-(c) is a figure which shows the formation process of the high friction layer to a roller main body. It is a schematic block diagram of the coating booth for forming a high friction layer. It is the principal part enlarged view of the joint of a roller main body, and its vicinity. (A)-(d) is the schematic which shows the structure of a roller main body. (A)-(c) is the schematic which shows the structure of a roller main body. (A) is a principal part perspective view of a roller main body, (b) is a side view. (A) is a principal part perspective view of a roller main body, (b) is a side view. (A) is a principal part perspective view of a roller main body, (b) is a side view. (A) is a principal part top view of a roller main body, (b) is a principal part perspective view. (A)-(d) is a principal part top view of the metal plate which shows an expansion | deployment engaging part. (A)-(c) is a principal part top view of the metal plate which shows an expansion | deployment engaging part. (A), (c) is a figure which shows a joint, (b) is a top view of a metal plate. (A) is a figure which shows the joint of a roller main body, (b) is a top view of a metal plate. (A) is a figure which shows the joint of a roller main body, (b) is a top view of a metal plate. FIG. 6 is a perspective view illustrating a relationship between a conveyance roller and a sheet during paper feeding. (A)-(c) is a figure for demonstrating the shape of a joint. (A) is shape explanatory drawing of a joint, (b) is effect | action explanatory drawing. It is a figure for demonstrating the shape of a joint. (A)-(c) is a figure for demonstrating the shape of a joint.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.
FIG. 1 is a side sectional view of an ink jet printer according to an embodiment of the present invention.
2A is a plan view showing a transport unit of the ink jet printer, and FIG. 2B is a side view showing a drive system of the transport unit.
As shown in FIG. 1, an ink jet printer (printing apparatus) 1 includes a printer main body 3, a paper feeding unit 5 provided on the upper rear side of the printer main body 3, and a paper discharging unit provided on the front side of the printer main body 3. 7.

  A paper feed tray 11 is provided in the paper feed unit 5, and a plurality of sheets (medium, recording medium, transport medium) P are stacked on the paper feed tray 11. Here, as the paper P, plain paper, coated paper, OHP (overhead projector) sheet, glossy paper, glossy film, or the like is used. Hereinafter, in the transport path of the paper P, the paper feed tray 11 side is referred to as an upstream side, and the paper discharge unit 7 side is referred to as a downstream side. A paper feed roller 13 is provided on the downstream side of the paper feed tray 11.

  The paper feed roller 13 is configured to pinch the paper P located at the uppermost part of the paper feed tray 11 with an opposing separation pad (not shown) and send the paper P downstream. A transport roller mechanism 19 is provided on the downstream side of the paper feed roller 13.

  The transport roller mechanism 19 includes a transport roller 15 disposed on the lower side and a driven roller 17 disposed on the upper side.

  The transport roller 15 is provided so that the paper P is sandwiched between it and the driven roller 17 and is rotationally driven by the drive unit 30 shown in FIG. Accordingly, the transport roller 15 can transport the paper P to the print head (printing unit) 21 disposed on the downstream side by a precise and accurate transport (paper feed) operation accompanying the transport printing process. ing.

  The print head 21 is held by a carriage 23, and the carriage 23 is configured to reciprocate in a direction orthogonal to the paper feeding direction (paper P transport direction). Printing processing (printing processing) by the print head 21 is controlled by the control unit CONT. A platen 24 is disposed at a position facing the print head 21.

  The platen 24 is composed of a plurality of diamond ribs 25 arranged at intervals along the moving direction of the carriage 23.

The diamond rib 25 supports the paper P from below when printing on the paper P by the print head 21, and the top surface functions as a support surface. The distance between the diamond rib 25 and the print head 21 can be adjusted according to the thickness of the paper P.
As a result, the paper P can smoothly pass over the top surface of the diamond rib 25. A paper discharge roller mechanism 29 is provided on the downstream side of the diamond rib 25 and the print head 21.

The paper discharge roller mechanism 29 includes a paper discharge roller 27 disposed on the lower side and a paper discharge jagged roller 28 disposed on the upper side. The paper P is pulled out by the rotation of the paper discharge roller 27 and discharged. Yes.
Here, a description will be given of the relationship among the drive speeds of the driving unit 30 of the transport roller mechanism 19 and the paper discharge roller mechanism 29, the transport roller 15, and the paper discharge roller 27.

As shown in FIGS. 2A and 2B, the printer main body 3 is provided with a transport motor 32 that is driven under the control of the control unit CONT. The drive shaft of the transport motor 32 is provided with a pinion 33, and the transport drive gear 35 is engaged with the pinion 33, and the transport roller 15 is inserted and connected to the transport drive gear 35. .
Under such a configuration, the transport motor 32 and the like serve as a drive unit 30 that rotationally drives the transport roller 15.

  The transport roller 15 is provided with an inner gear 39 coaxially with the transport drive gear 35, and an intermediate gear 41 is engaged with the inner gear 39. The intermediate gear 41 has a paper discharge drive gear 43. Are in mesh. The rotation shaft of the paper discharge drive gear 43 is a shaft body 45 of the paper discharge roller 27 as shown in FIG.

  Under such a configuration, the transport roller 15 of the transport roller mechanism 19 and the paper discharge roller 27 of the paper discharge roller mechanism 29 are driven by receiving the rotational driving force from the transport motor 32 that is the same drive source. It has become so.

  The rotation speed of the paper discharge roller 27 is set to be faster than the rotation speed of the transport roller 15 by adjusting the gear ratio of each gear. Accordingly, the paper discharge speed of the paper discharge roller mechanism 29 is faster than the transport speed of the transport roller mechanism 19 by an increase rate.

  Further, the holding force (pressing force) of the paper P by the transport roller mechanism 19 is set larger than the holding force (pressing force) by the paper discharge roller mechanism 29. Therefore, when the transport roller mechanism 19 and the paper discharge roller mechanism 29 both hold the paper P, the paper transport speed is independent of the paper discharge speed of the paper discharge roller mechanism 29 and is transported by the transport roller mechanism 19. It is specified by speed.

Next, the conveyance roller 15 and the conveyance roller mechanism 19 provided with the same will be described.
FIG. 3A is a diagram illustrating a schematic configuration of the transport roller mechanism 19, and FIG. 3B is a diagram illustrating a schematic configuration of the bearing.
The transport roller 15 includes a hollow cylindrical roller body (cylindrical shaft) 16 and a high friction layer (medium support region) 50 formed in a part of the surface of the roller body 16 in the longitudinal direction (axial direction). ing.

  The roller body 16 is formed using a steel plate coil around which a metal plate such as a galvanized steel plate or a stainless steel plate is wound as a base material. The roller body 16 is a cylindrical shaft formed in a cylindrical shape that is bent so that a pair of end faces of the metal plate on which the coil is rewound is opposed to each other, and a surface that is on the inner peripheral surface side of the coil is an inner peripheral surface. is there. That is, the metal plate forming the roller body 16 is formed in a cylindrical shape in a state in which the winding by the coil remains so as to warp the inner peripheral surface side of the cylinder.

  Further, the roller body 16 has a seam 80 formed between a pair of end faces 61a and 61b of a metal plate which is bent and abutted as shown in FIGS. 11 (a) and 11 (b). . In the roller body 16 of the present embodiment, the circumferential direction (bending direction) and the coil winding direction (metal plate rolling direction) are the same, and the seam 80 is substantially parallel to the axial direction of the roller body 16. Is formed.

  As shown in FIG. 3A, the high friction layer 50 is selectively formed in a central portion excluding both ends of the roller body 16. The surface of the high friction layer 50 is fixed in a state where a sharp pointed portion of the inorganic particles is exposed, and exhibits a high frictional force.

  The high friction layer 50 is formed by selectively applying resin particles with a uniform film thickness of, for example, about 10 μm to 30 μm to the formation region of the high friction layer on the surface of the roller body 16. Inorganic particles are uniformly dispersed on the surface and then fired. As the resin particles, fine particles having a diameter of about 10 to 20 μm made of, for example, an epoxy resin or a polyester resin are preferably used. Further, as the inorganic particles, ceramic particles such as aluminum oxide (alumina; Al 2 O 3), silicon carbide (SiC), silicon dioxide (SiO 2) and the like adjusted to a predetermined particle size distribution by crushing treatment are preferably used.

  As shown in FIG. 3A, both ends of the transport roller 15 are rotatably held by a bearing 26 integrally formed with the platen 24 (see FIG. 1). As shown in FIG. 3 (b), the bearing 26 is formed in a U-shape that opens upward, and the conveyance roller 15 is fitted into this U-shaped portion so that the conveyance roller 15 is moved in the three directions of the front and rear sides and the lower side. From the pivot. Then, lubricating oil (lubricating liquid) such as grease is supplied (applied) to the contact surface between the bearing 26 and the transport roller 15 (the surface of the transport roller 15). Further, an engaging portion (not shown) for engaging and connecting the inner gear 39 and the transport driving gear 35 so as not to rotate is formed at one or both ends of the transport roller 15. Since the transport roller 15 is connected to various connecting parts, various forms of engaging portions can be formed.

  The driven roller 17 is configured by a plurality of (for example, six) rollers 17 a arranged coaxially, and is arranged at a position facing and contacting the high friction layer 50 of the transport roller 15. A biasing spring (not shown) is attached to the driven roller 17 composed of these rollers 17a, and thereby the driven roller 17 is biased toward the transport roller 15 side.

  Therefore, the driven roller 17 comes into contact with the high friction layer 50 of the transport roller 15 with a predetermined pressing force (clamping force with respect to the paper P), and rotates following the rotation operation of the transport roller 15. Moreover, the force which clamps the paper P between the conveyance roller 15 and the driven roller 17 becomes large, and the conveyance property of the paper P becomes more favorable.

Note that the surface of each roller 17a of the driven roller 17 is subjected to a low wear treatment such as a fluororesin coating in order to alleviate damage due to sliding contact with the high friction layer 50.
The conveyance roller 15, the bearing 26, the drive unit 30, the driven roller 17, and the like described above constitute a conveyance unit (conveyance device) 20 of the inkjet printer 1.

Next, the operation of the ink jet printer 1 will be described with reference to FIGS.
The inkjet printer 1 clamps the paper P located at the uppermost part of the paper feed tray 11 by the paper feed roller 13 and sends it out downstream. The fed paper P reaches the transport roller mechanism 19. The transport roller mechanism 19 nips the paper P between the transport roller 15 and the driven roller 17, and transports the paper P at a constant speed toward the lower side of the print head 21 by a paper feeding operation by the rotational drive of the transport roller 15. The paper P conveyed below the print head 21 is printed with high quality by the print head 21 while smoothly passing over the top surface of the diamond rib 25. The paper P printed by the print head 21 is sequentially discharged by the paper discharge roller 27 of the paper discharge unit 7.

  Since the conveyance speed of the paper discharge roller mechanism 29 is set faster than the conveyance speed of the conveyance roller mechanism 19, the paper P is conveyed in a state where the back tension is applied. However, when the transport roller mechanism 19 and the paper discharge roller mechanism 29 both hold the paper P, the paper transport speed is defined by the transport speed of the transport roller mechanism 19. Therefore, even when the paper discharge roller mechanism 29 and the transport roller mechanism 19 simultaneously perform paper discharge and transport in this way, the transport speed of the paper is defined by the transport speed of the transport roller mechanism 19. Therefore, accurate and stable paper feeding (conveyance) without unevenness of conveyance is performed.

  Here, when the paper P is supported and transported by the high friction layer 50 of the transport roller 15, torque acts on the roller body 16. Then, stress acts in the direction in which the joint 80 (see FIG. 8) between the pair of end surfaces 61a and 61b of the metal plate forming the roller body 16 opens. When the seam 80 of the roller body 16 is opened, the transport roller 15 does not come into uniform contact with the paper P, and transport unevenness occurs.

  However, in the present embodiment, the roller main body 16 of the transport roller 15 is formed of a metal plate that is still wound by a steel plate coil, and is formed in a cylindrical shape in which a surface that is the inner peripheral side of the coil is an inner peripheral surface. ing. The winding of the metal plate by the steel plate coil is a warp such that the surface that was the inner peripheral surface of the steel plate coil becomes a concave surface. In other words, the metal plate forming the roller body 16 remains so as to warp toward the inner peripheral surface side of the roller body 16.

  Therefore, the winding does not act at least in the direction of opening the joint of the roller body 16. Therefore, it is possible to make it difficult to open the seam of the roller body 16 as compared with the case where the winding around the outer peripheral surface side of the roller body 16 remains. That is, according to the present embodiment, even when stress is applied in the direction of opening the seam of the roller body 16, it is possible to prevent the seam from opening and to provide the transport roller 15 that can obtain high transport accuracy. can do.

Moreover, the circumferential direction (bending direction) of the roller main body 16 and the winding direction (rolling direction of a metal plate) of a steel plate coil are the same. Therefore, the bending direction of the metal plate forming the roller body 16 can be matched with the direction of warping due to winding. Thereby, the winding of the metal plate which forms the roller main body 16 acts in the direction which closes the joint of the roller main body 16.
Therefore, the joint of the roller body 16 can be prevented more effectively.

  In addition, by adopting a hollow cylindrical shaft for the roller body 16, the weight can be greatly reduced as compared with the case where a solid shaft is used. Moreover, the request | requirement with respect to the machinability of material becomes low compared with the case where a solid axis | shaft is used for the roller main body 16. FIG. Therefore, it is possible to use a material that does not contain harmful substances such as lead as the material of the roller body 16, and the environmental load can be reduced.

  In addition, a high friction layer 50 is formed on the transport roller 15, and the driven roller 17 is disposed at a position where the driven roller 17 contacts the high friction layer 50. Therefore, the force for pinching the paper P between the transport roller 15 and the driven roller 17 is increased, and the transportability of the paper P is improved.

  Moreover, the conveyance part 20 of this embodiment is provided with the conveyance roller 15 and the bearing 26 which supports this. Therefore, as described above, the transport roller 15 that can obtain high transport accuracy can be supported and rotated by the bearing 26, and the paper P can be supported by the high friction layer 50 and transported with high accuracy. In addition, by adopting the hollow roller body 16 as the transport roller 15, the weight of the transport unit 20 can be greatly reduced compared to the case of using a solid shaft, and the environmental load can be reduced.

  Further, the inkjet printer 1 of the present embodiment can transport the paper P with high accuracy by the transport unit 20 and can perform printing processing on the paper P with high printing accuracy. Further, by adopting the hollow roller body 16 as the transport roller 15, the weight of the entire apparatus can be greatly reduced as compared with the case where a solid shaft is used, and the environmental load can be reduced.

Next, the manufacturing apparatus of the conveyance roller 15 is demonstrated.
FIG. 4 is a schematic view of a manufacturing apparatus for the transport roller 15 according to the present embodiment.
As shown in FIG. 4, the manufacturing apparatus 100 has a configuration in which an uncoiler 110, a leveler 120, a first press machine 130, and a second press machine 140 are arranged in one direction.
Further, the manufacturing apparatus 100 includes a conveyance unit (not shown) that sends the metal plate M unwound from the coil C in one direction, and a cutting unit (not shown) that cuts the processed cylindrical shaft from the metal plate M. .
The uncoiler 110 is for supporting a cylindrical coil (steel plate coil) C around which a metal plate M is wound in the rolling direction so as to be rotatable about an axis and rewinding the coil C.

  The leveler 120 includes a plurality of work rolls 121 arranged alternately above and below, and the metal plate M is flattened by passing the metal plate M between the upper and lower work rolls 121. The leveler 120 of this embodiment does not completely remove the wrapping (warping) caused by the coil C of the metal plate M, but adjusts the wrapping to such an extent that processing by the first press machine 130 is possible. .

The first press machine 130 includes a male die (punch) 131 and a female die (die) 132, and is configured to punch the metal plate M into a predetermined shape by pressing.
The second press machine 140 includes a plurality of female dies (bending dies) 141 and 143 and male dies (bending punches) 142 and 144 arranged in one direction, and an upper die 145 and a lower die 146. The plate M is configured to be bent. Then, while the metal plate M is intermittently fed in one direction by a conveyance unit (not shown), the metal plate M is gradually brought closer to the cylinder by sequentially bending with different molds (sequential feed). ing.

Next, a method for manufacturing the transport roller 15 will be described.
First, for example, a coil C is prepared in which a metal plate M such as a cold rolled steel plate or an electrogalvanized steel plate having a thickness of about 0.8 mm to 1.2 mm is wound in the rolling direction. And the coil C is supported by the uncoiler 110 of the manufacturing apparatus 100, the coil C is rotated around an axis | shaft, and the metal plate M is rewound. The metal plate M unwound from the coil C is in a state in which an arc-like winding remains in a side view in which the inner peripheral surface C1 of the coil C is concave and the outer peripheral surface C2 is convex. . The rewound metal plate M is transported in one direction (rolling direction) by a transport unit (not shown) and reaches the leveler 120.

  The metal plate M that has reached the leveler 120 is flattened by a plurality of work rolls 121 arranged above and below, and the winding is adjusted. As a result, the metal plate M is flattened to such an extent that it can be processed by the first press machine 130, but the winding around which the inner peripheral surface C1 of the coil C becomes concave is left to some extent. The metal plate M flattened by the leveler 120 is transported in one direction by a transport unit (not shown) and reaches the first press machine 130.

  The metal plate M that has reached the first press machine 130 is punched by a press using a male die 131 and a female die 132. In this punching process, for example, a metal plate M die-cut by a punching process as shown in FIGS. 5A and 5B is formed as a base material. That is, the metal plate M that is the base material of the roller body 16 is bent into a cylindrical shape with the upper surface C2 facing the male mold 131 shown in FIG.

  In this case, even in the case where sagging sd, shear surface sp, fracture surface bs, and burr (not shown) are formed on the metal plate M that has been die-cut as shown in FIG. It is preferable that the upper surface C <b> 2 on which the sagging sd is formed be on the outer peripheral side of the roller body 16. In other words, it is preferable that the lower surface C <b> 1 of the metal plate M continuing to the burr and the fracture surface bs is on the inner peripheral side of the roller body 16.

  Thereby, when forming the roller main body 16 which has a joint 80 (refer FIG.8 (c) etc.) by abutting a pair of end surface 61a, 61b of the metal plate M, the burr | flash and the unevenness | corrugation of the torn surface bs become obstacles. The seam 80 can be prevented from opening.

  Therefore, the accuracy of the seam 80 of the roller body 16 can be improved, and the conveyance roller 15 that can obtain high conveyance accuracy can be provided. Moreover, the burr | flash becomes the inner peripheral surface side of the roller main body 16, it can prevent protruding from the outer peripheral surface of the roller main body 16, and a burr removal process can be skipped and productivity can be improved.

FIG. 6 is a plan view of the metal plate M punched by the first press machine 130.
As shown in FIG. 6, the metal plate M is punched into a frame portion 66 that is continuous in the transport direction (rolling direction), a strip-shaped flat plate portion 60 that extends in a direction crossing the transport direction, and a frame portion 66. A connecting portion 67 that connects the flat plate portion 60 is formed. In the present embodiment, the flat plate portion 60 is substantially rectangular, and is stamped such that the short side 60a is parallel to the rolling direction and the long side 60b is orthogonal to the rolling direction. By repeatedly pressing the metal plate M while being transported intermittently by a transport unit (not shown), a plurality of flat plate portions 60 and connecting portions 67 are formed at equal intervals in the transport direction of the metal plate M.

The metal plate M punched by the first press machine 130 is transported by a transport unit (not shown) and reaches the second press machine 140 shown in FIG.
FIG. 7A to FIG. 7C and FIG. 8A to FIG. 8C are side views showing a bending process by the second press machine 140.

  The flat plate portion 60 of the metal plate M that has reached the second pressing machine 140 is bent by a press in a direction (rolling direction) parallel to the short side 60a shown in FIG. That is, bending is performed so that a pair of end faces along the long sides 60b and 60b on both sides of the flat plate portion 60 are brought close to each other. Then, as shown in FIGS. 7A to 7C and FIGS. 8A to 8C, the pair of end faces are formed in a cylindrical shape so as to face each other.

  Specifically, first, the flat plate portion 60 of the metal plate M is pressed with a female die (bending die) 141 and a male die (bending punch) 142 shown in FIG. 62b is bent into an arc shape (preferably approximately ¼ arc). In FIG. 7A, these members are shown with a space between the flat plate portion 60, the female die 141, and the male die 142 for easy understanding of each member. In reality, it does not exist, and the flat plate portion 60, the female die 141, and the male die 142 are in close contact with each other at their contact portions. The same applies to FIGS. 7B, 7C, and 8A to 8C described later.

  Here, the male mold 142 is disposed so as to face the surface C1 (the lower surface of the flat plate portion 60 in FIG. 7) which is the inner peripheral side in the coil C shown in FIG. Moreover, the female die 141 is disposed so as to face the surface C2 (the upper surface of the flat plate portion 60 in FIG. 7) which is the outer peripheral side in the coil C shown in FIG. Thereby, both side parts 62a and 62b of the flat plate part 60 are bent to the surface C1 side which was the inner peripheral surface of the coil C.

  Next, after feeding the metal plate M in one direction, the second female die (bending die) 143 and the second male die (bending punch) 144 shown in FIG. The center part in the side direction (bending direction) is pressed. Then, the flat plate portion 60 is bent into an arc shape (preferably approximately ¼ arc) on the surface C1 side which is the inner peripheral side in the coil C shown in FIG.

  Next, after feeding the metal plate M in one direction, the core die 147 is disposed inside the flat plate portion 60 as shown in FIG. Then, using the upper mold 145 and the lower mold 146 shown in FIG. 7C, as shown in FIG. 8A to FIG. 8C, the end faces 61a of both side portions 62a and 62b of the flat plate portion 60. , 61b are brought close to each other.

  Here, the outer diameter of the core die 147 shown in FIGS. 7C and 8A to 8C is equal to the inner diameter of the hollow cylindrical roller body 16 to be formed. Further, as shown in FIG. 7C, the radius of the press surface 146c of the lower die 146 and the radius of the press surface 145a of the upper die 145 are equal to the radius of the outer diameter of the roller body 16 considering the polishing margin. It is. Further, as shown in FIGS. 8A to 8C, the lower mold 146 is a pair of left and right split molds, and the split molds 146a and 146b are configured to be able to move up and down independently.

  That is, from the state shown in FIG. 7 (c), as shown in FIG. 8 (a), the left split mold 146a is brought close to the upper mold 145, and one side of the flat plate portion 60 is pressed to form a substantially semicircular shape. Bend to. The upper mold 145 is also a pair of left and right split molds (refer to the split surface 145b) as in the lower mold 146, and the upper mold on the same side is brought close to the split mold 146a in the process shown in FIG. Also good.

  Next, as shown in FIG. 8B, the core die 147 is moved to the upper die 145 side slightly (so that the end surface 61a on one side and the end surface 61b on the other side can be brought close to each other) The split mold 146b on the other side is brought close to the upper mold 145, and the other side of the flat plate portion 60 is pressed and bent into a substantially semicircular shape.

  Thereafter, as shown in FIG. 8C, the core mold 147 and the pair of split molds 146a and 146b are both brought close to the upper mold 145 to form a cylindrical roller body (hollow pipe) 16. In this state, the end surfaces 61a and 61b on both the left and right sides are in a state of facing each other. That is, in this cylindrical roller body 16, the end surfaces 61a and 61b on both sides of the flat plate portion 60 of the metal plate M as a base material are close to each other, and a seam is formed between these end surfaces 61a and 61b. ing. Here, the surface C1 which was the inner peripheral side of the coil C shown in FIG. 4 is the inner peripheral surface of the roller body 16, and C2 which was the outer peripheral surface of the coil C is the outer peripheral surface of the roller body 16. . Thus, the roller body 16 is formed so that the flat plate portion 60 is wound around the core die 147.

FIG. 9 shows a metal plate M in which the flat plate portion 60 is formed into a cylindrical shape in stages through the steps shown in FIGS. 7 (a) to 7 (c) and FIGS. 8 (a) to 8 (c). It is a top view.
The metal plate M punched out as shown in FIG. 6 reaches the second press machine 140 shown in FIG. 4 and is intermittently sent in one direction, while FIGS. 7 (a) to 7 (c), The flat plate portion 60 is sequentially bent by a press through the steps shown in FIGS. 8A to 8C (a progressive press). Therefore, as shown in FIG. 9, the flat plate portion 60 that has reached the second press machine 140 becomes closer to a cylinder toward the front in the conveying direction of the metal plate M. After the flat plate portion 60 is formed in a cylindrical shape, the connecting portion 67 is cut by a cutting portion (not shown) to form a hollow cylindrical roller body 16.

  Next, in this embodiment, centerless polishing is performed in order to increase the roundness of the formed roller body 16 and reduce the shake (polishing process). In the polishing step, as shown in FIG. 10, the outer peripheral surface 16a of the roller body 16 is polished using a grindstone member GD formed in a columnar shape (or a cylindrical shape). When performing the polishing step, the core member CR is inserted in advance so as to penetrate the inside of the roller body 16.

  After inserting the core member CR into the roller body 16, the roller body 16 is disposed between the two grindstone members GD disposed with a space smaller than the outer diameter of the roller body 16. It is set as the state which touched the outer peripheral part of one grindstone member GD. Thereafter, the two grindstone members GD are rotated in the same direction, for example. A frictional force is generated between each grindstone member GD and the roller body 16 by the rotation of the two grindstone members GD.

  The two grindstone members GD are formed so that the dimension in the longitudinal direction (the height direction of the cylinder) is larger than that of the roller body 16 so that the entire longitudinal direction of the roller body 16 can be polished at a time. It is preferable to use one. Further, at the time of rotation of the grindstone member GD, in order to ensure a margin in the longitudinal direction of the roller main body 16, for example, at the central portion in the longitudinal direction of the grindstone member GD, for example, the entire longitudinal direction contacts the two grindstone members GD. It is preferable to arrange the roller body 16.

  The outer peripheral surface 16a of the roller main body 16 is polished while the roller main body 16 rotates in a direction opposite to the rotation direction of the grindstone member GD by the frictional force generated by the rotation of the grindstone member GD. For this reason, almost the entire outer peripheral surface 16a of the roller body 16 is uniformly polished, and the roundness of the roller body 16 becomes better than before the polishing step.

  By the way, different internal stresses are generated in the seam portion of the roller body 16 formed by pressing and other portions of the roller body 16. Due to the difference in stress, the roller body 16 may be deformed, for example, the roller body 16 may be bent along the seam. When the polishing process is performed with the roller body 16 still deformed, a difference occurs in the amount of shaving between the longitudinal end portion and the center portion of the roller body 16, and the thickness of the roller body 16 after polishing is increased. There is a risk of non-uniformity.

  Therefore, in the present embodiment, the roller main body 16 is disposed between the grindstone members GD with the core member CR inserted in advance so as to penetrate the inside of the roller main body 16 as described above, and in this state, the two grindstones are arranged. The member GD is rotated. By disposing the core member CR inside the roller body 16, deformation such as bending of the roller body 16 is suppressed. When the polishing process is performed in this state, the polishing is performed in a state in which the deformation of the roller body 16 is suppressed. Therefore, the amount of shaving is between the longitudinal end and the center of the roller body 16 after the polishing process. Differences are less likely to occur.

  The core member CR may be formed in a cylindrical shape using a material having high rigidity such as metal, and may have an outer diameter equal to the inner diameter of the roller body 16. When the core member CR formed in this way is disposed so as to penetrate through the inside of the roller body 16, the core member CR is in close contact with the entire inner peripheral surface 16 b of the roller body 16, and the deformation suppressing force of the roller body 16 is reduced. Will increase. As for the rigidity of the core member CR, it is preferable that the core member CR has a rigidity higher than at least the rigidity of the roller body 16. For example, a core member formed in a cylindrical shape may be used as the core member CR.

  When the core member CR is extracted from the roller body 16 after performing the polishing step, the roller body 16 having a high roundness and a small deflection amount is obtained. In the roller body 16, the gap between the both end faces 61a and 61b is further narrowed, so that the gap 80 between the both end faces 61a and 61b is narrowed as shown in FIG. Is formed.

  In the pressing process and polishing step, it is preferable that the gap between the both end faces 61a and 61b of the flat plate portion 60 is eliminated, that is, the both end faces 61a and 61b are in contact with each other. However, it is difficult to completely eliminate the gap while improving the roundness and the amount of deflection of the roller body 16 to be obtained, and a certain amount of gap is formed at present.

  The seam 80 has the same dimension (width) on the outer peripheral surface and the inner peripheral surface of the flat plate portion 60, so that the distance between the pair of end surfaces 61a and 61b is a roller as shown in FIG. The main body 16 is relatively wide on the outer peripheral surface 16a side and relatively narrow on the inner peripheral surface 16b side.

  When the roller body 16 serving as the cylindrical shaft according to the present invention is thus formed, a high friction layer 50 as shown in FIG. 3 is formed on the surface of the roller body 16.

  As a method for forming the high friction layer 50, a dry method and a wet method (or a method using both of them) can be employed. In this embodiment, the dry method is preferably employed. Specifically, first, resin particles and inorganic particles are prepared as a material for forming the high friction layer 50. As the resin particles, fine particles having a diameter of about 10 μm made of an epoxy resin or a polyester resin are preferably used.

  As inorganic particles, ceramic particles such as aluminum oxide (alumina; Al2O3), silicon carbide (SiC), silicon dioxide (SiO2), etc. are preferably used. Among these, alumina is more preferably used because it has a relatively high hardness and functions well to increase frictional resistance, and is relatively inexpensive and does not hinder cost reduction. Therefore, in this embodiment, alumina particles are used as the inorganic particles.

  As the alumina particles, those adjusted to a predetermined particle size distribution by crushing treatment are used. By being produced by crushing treatment, the alumina particles have a sharp end with a relatively sharp end, and the sharp end has a high frictional force.

  Further, in this embodiment, the alumina particles are adjusted so that the particle diameter is in the range of 15 μm or more and 90 μm or less, and the weighted average particle diameter (average particle diameter) serving as the center diameter is 45 μm. Things are used.

  That is, in the present invention, alumina particles (inorganic particles) having an average particle diameter (center diameter) larger than the distance d1 (30 μm) on the outer peripheral surface side of the seam 80 are used. In particular, the particle size distribution (particle size range) includes particles that are smaller than the distance d1 on the outer peripheral surface side of the joint 80 and larger than the distance d2 (10 μm) on the inner peripheral surface side. Is preferred. Furthermore, it is preferable that the minimum particle size in the particle size distribution is larger than the shortest distance between the pair of end portions 61a and 61b in the joint 80, for example, the distance d2 on the inner peripheral surface side.

  When such resin particles and inorganic particles are prepared, first, the above-described resin particles are applied to the roller body 16. That is, the roller main body 16 is disposed in a painting booth (not shown), and the roller main body 16 is set to, for example, a minus (minus) potential in a single state.

  Then, the spray particles (resin particles) are charged to a + (plus) high potential while spraying (spraying) the resin particles toward the roller body 16 using a tribogun of an electrostatic coating apparatus (not shown). Let Then, the charged resin particles are adsorbed on the outer peripheral surface of the roller body 16 to form a resin film.

  Here, the formation of the resin film by spraying the resin particles corresponds to the formation region of the high friction layer 50 shown in FIG. That is, without performing over the entire length of the roller body 16, for example, by masking both end portions with a tape or the like, it is performed only in the central portion excluding the both end portions as shown in FIG. That is, the resin film 51 is selectively formed only in a region corresponding to at least the central portion of the transport roller 15 including the roller body 16 that is in contact with the paper (medium) P to be transported. In FIG. 12A and FIGS. 12B and 12C described later, the seam 80 is not shown.

  In the resin film 51, weak static electricity of about +0.5 KV remains after spray coating. In this spray coating, the roller body 16 is rotated around its axis, so that the resin film 51 is formed with a substantially uniform thickness over the entire circumference. The resin film 51 is formed to have a film thickness of, for example, about 10 μm to 30 μm in consideration of the powder diameter of the alumina particles described above. About such a film thickness, it can adjust suitably with the ejection amount, ejection time, etc. of a resin particle.

  Next, the roller main body 16 on which the resin film 51 is formed is taken out from the above-described painting booth and transferred to another painting booth 90 shown in FIG. 13 by a handling robot (not shown). The coating booth 90 is provided with a pair of rotational drive members 91 and 91 at the lower portion thereof, and the rotational drive members 91 and 91 are provided with a chuck 92 for supporting the roller body 16 substantially horizontally. ing.

  Then, both ends of the roller body 16 are held and fixed to the chucks 92 and 92, and the chucks 92 and 92 are rotated by the rotation driving member 91. As a result, the roller body 16 is slowly rotated around its axis at a low speed of, for example, about 100 rpm to 500 rpm. Of course, the roller body 16 may be supported slightly obliquely.

  Further, a corona gun 93 is disposed at the upper portion of the painting booth 90, and the corona gun 93 moves on the shaft 94 in the left-right direction in FIG. Further, an exhaust mechanism 90 a is provided at the bottom of the painting booth 90. As a result, a slow air flow is formed in the painting booth 90 in the downward direction. The suction air volume of the exhaust mechanism 94 is set appropriately.

  Under such a configuration, the alumina particles 95 are sprayed and sprayed from the corona gun 93 while rotating the roller body 16 about its axis, whereby the alumina particles are formed on the resin film 51 formed on the roller body 16. 95 is selectively electrostatically adsorbed. The alumina particles are selectively electrostatically adsorbed on the resin film 51 by masking both end portions of the roller body 16 with a tape or the like as in the formation of the resin film 51.

At the time of electrostatic coating, the surface potential of the chuck 92 and the rotary drive member 91 is set to be substantially equal to the potential of the roller body 16, and the inner surface potential of the coating booth 90 is electrically neutral and substantially zero. To do. This is to prevent the alumina particles 95 from the corona gun 93 from being adsorbed to parts other than the roller body 16. In order to keep the inner surface potential of the coating booth 90 electrically neutral, it is desirable to manufacture the coating booth 90 using a steel plate having an inner surface electrical resistance of, for example, about 10 ¹¹ Ω.

  The electric potential applied to the corona gun 93 is set to zero V, and the pressure of the air supplied to the corona gun 93 is set to a low value of about 0.2 Mpa. Next, while moving the corona gun 93 in the left-right direction in FIG. 13, alumina particles 95 with substantially zero potential are blown out from above, and the alumina particles 95 are naturally dropped by their own weight in the vertical direction.

  Then, as described above, since the weak static electricity (about +0.5 KV) remains in the resin film 51 of the roller body 16 by the electrostatic coating, the alumina particles 95 are resinated by this static electricity. Electrostatic adsorption is performed almost uniformly on the entire circumference of the film 51. The alumina particles 95 thus electrostatically adsorbed adhere to the outer peripheral surface of the roller body 16 using the resin film 51 as a binder in a state where the alumina particles 95 are in contact with the surface of the resin film 51 and partially enter.

  Here, in this embodiment, since the inner surface potential of the coating booth 90 is electrically neutral and substantially zero, and the air flow in the coating booth 90 is formed in a slow downward flow, the alumina particles 95 naturally falls down vertically due to its own weight. Below the dropping direction, the horizontally supported roller body 16 rotates slowly around its axis, so that the alumina particles 95 are dispersed almost uniformly on the outer peripheral surface of the roller body 16.

  Accordingly, the alumina particles 95 are uniformly attached to the surface of the resin film 51 that is not particularly masked. As a result, the roller main body 16 has alumina in the resin film 51 at the center as shown in FIG. The particles (inorganic particles) 95 are dispersed and exposed. That is, when the alumina particles 95 come into contact with the resin film 51 by electrostatic attraction, a part of the alumina particles 95 enters the resin film 51 and the remaining part protrudes from the surface of the resin film 51. At that time, since the alumina particles 95 are likely to stand vertically to the surface of the roller body 16, the alumina particles 95 are uniformly distributed, and most of them are sharply pointed (top) facing outward. Adhere to.

  Therefore, the alumina particles 95 exhibit a high frictional force due to the end portion protruding from the surface of the resin film 51. Here, in order for the alumina particles 95 to exhibit a necessary and sufficient frictional force against the paper P, the area occupied by the alumina particles 95 is 20% to 80% with respect to the area of the resin film 51. Is preferred.

  The application (spreading) of the alumina particles 95 is not limited to the application by the electrostatic coating method as long as the alumina particles 95 are slowly sprayed downward in the vertical direction. For example, a spray gun is used. The application (spreading) method may be used.

  After the alumina particles 95 are spread and adhered on the resin film 51 in this way, the roller body 16 is heated at a temperature of about 180 ° C. to 300 ° C. for about 20 minutes to 30 minutes, and the resin film 51 is baked and cured. . As a result, the alumina particles 95 are fixed to the roller body 16. Thus, as shown in FIG. 12C, the high friction layer 50 is formed in which the alumina particles (inorganic particles) 95 are dispersed and exposed in the resin film 51, and the transport roller 15 according to the present invention is obtained.

  In the present embodiment, the application (spraying) of the resin particles and the application (spraying) of the alumina particles (inorganic particles) are performed in different painting booths. However, it may be performed in the same painting booth. It is.

  When the high friction layer 50 is formed in this manner, the gap between the end faces 61a and 61b is mainly formed in the joint 80, without forming a groove due to the gap between the end faces 61a and 61b of the flat plate portion 60. Embedded with alumina particles 95.

  That is, since alumina particles 95 having an average particle diameter larger than the distance d1 on the outer peripheral surface side of the seam 80 are used, most of the alumina particles 95 do not enter the seam 80. As shown in FIG. 14, it adheres to the outer peripheral surface of the roller body 16 through a resin film 51. Therefore, although the gap is formed between the end surfaces 61a and 61b of the flat plate portion 60 in the joint 80, the alumina particles 95 cover the gap, so that a groove due to the gap is substantially formed. It will not be done.

  Further, the alumina particle 95 has a particle size distribution (particle size) including particles 95a that are smaller than the distance d1 (30 μm) on the outer peripheral surface side of the joint 80 and larger than the distance d2 (10 μm) on the inner peripheral surface side. Since the particles 95a enter the gap formed in the joint 80 and stay there, the groove due to the joint 80 is not reliably formed.

  In addition, even when a force is applied to the roller main body 16 (conveying roller 15) in the direction of narrowing the gap during use or the like, the alumina particles 95a that have entered here resist this force, so the roller main body 16 (conveying roller 15). The deformation of is suppressed. Therefore, in the transport roller mechanism 19 including the transport roller 15, transport unevenness due to deformation of the transport roller 15 is prevented.

Furthermore, since the minimum particle size in the particle size distribution of the alumina particles 95 is larger than the shortest distance between the pair of end surfaces 61a and 61b in the joint 80, that is, the distance d2 on the inner peripheral surface side. When the high friction layer 50 is formed by arranging the alumina particles 95 on the surface of the roller body 16, the alumina particles 95 do not enter the roller body 16 through the gap formed in the joint 80. Therefore, processing such as cleaning the inside of the roller body 16 is reduced thereafter, and productivity can be improved correspondingly.
Through the above steps, as shown in FIG. 3A, a high friction layer 50 is formed in which the alumina particles are dispersed and exposed in the resin film, and the transport roller 15 is obtained.

  As described above, according to the present embodiment, in the centerless polishing process, the roller main body 16 is curved by polishing the outer peripheral surface 16a of the roller main body 16 with the core member CR disposed inside the roller main body 16. It can suppress that it grind | polishes with doing. Since the entire outer peripheral surface 16a of the roller body 16 is polished almost uniformly, the thickness of the roller body 16 after polishing is uniformly formed. Thereby, the conveyance roller 15 which is hard to generate | occur | produce a conveyance defect can be manufactured.

  In addition, according to the present embodiment, since the thickness of the roller body 16 is uniformly formed in the centerless polishing process, for example, the roller body 16 in which the outer peripheral surface 16a is polished in a painting process performed after the centerless polishing process. When the roller is heated, an internal stress is uniformly generated on the roller body 16. Thereby, the deformation | transformation of the roller main body 16 by heating, etc. can be avoided.

  Moreover, according to this embodiment, after performing the centerless grinding | polishing process with respect to the roller main body 16, it decided to remove the core member CR from the inside of the roller main body 16, and to perform a heating process at the time of a painting etc. after that. Therefore, it can be avoided that the roller body 16 is affected by the thermal deformation of the core member CR.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, when the centerless polishing process is performed on the roller body 16, the core mold 147 used in the previous process of the centerless polishing process may be used as it is as the core member CR. In this case, since the process of inserting the core member CR can be omitted, the manufacturing process of the transport roller can be simplified. Further, in a state where the metal plate M is wound around the core die 147, the metal plate M and the core die 147 are formed in close contact with each other, so that the bending of the roller body 16 can be more reliably suppressed.

  Moreover, in the said embodiment, although the roller main body 16 was set as the structure currently formed as the base material, the steel plate coil by which metal plates, such as a galvanized steel plate and a stainless steel plate, were wound, it is restricted to this. No. For example, the roller body 16 may be formed by using a flat metal plate as a base material, forming a metal plate having substantially the same shape and dimensions as the flat plate portion 60 from the flat metal plate, and processing the metal plate. I do not care. Therefore, for example, in the above description or the following description, the present invention is applicable even when the flat plate portion 60 is replaced with the metal plate.

Further, for example, an opening 170 may be provided in a part of the seam 80 formed in the roller body 16 as shown in FIG.
As shown in FIG. 15B, the seam 80 formed in the roller body 16 has a groove shape in which the inner peripheral sides of the pair of end surfaces 61a and 61b are in close contact with each other and the outer peripheral sides are separated from each other. Alternatively, the seam 80 may be formed as a gap with the pair of end surfaces 61a and 61b not contacting each other and the end surfaces 61a and 61b being slightly separated. Since the seam 80 is formed over the entire length of the transport roller 15, when the grease L supplied to the bearing 26 adheres to the surface of the transport roller 15, the grease L flows along the seam 80 by capillary action. . In particular, as the joint 80 (maximum distance d1 between the end surfaces 61a and 61b) is reduced in order to improve the strength of the transport roller 15, the capillary phenomenon of the grease L becomes stronger and the grease L tends to flow along the joint 80. .

  Therefore, as shown in FIG. 15C, an opening 170 is provided in a part of the seam 80 formed in the roller body 16. As shown in FIG. 15C, the opening 170 is formed by notches 176 and 177 provided in a pair of end surfaces 61a and 61b forming the joint 80, respectively. When the end surfaces 61a and 61b are brought into contact with each other, the maximum distance d2 between the notches 176 and 177 is set to be, for example, about 1 mm or more, and functions as the opening 170.

  The opening 170 is provided in a region excluding a region where the high friction layer 50 is formed and a region supported by the bearing 26 in the joint 80 formed over the entire length of the transport roller 15 (roller body 16). That is, the high friction layer 50 is formed at substantially the center of the transport roller 15, and both ends of the transport roller 15 are supported by the bearings 26, so that the transport roller 15 is provided with at least two openings 170.

  The opening 170 is provided for the purpose of preventing the grease L (lubricant) supplied (applied) to the bearing 26 from reaching the high friction layer 50 along the joint 80 (the gap between the end surfaces 61a and 61b). That is, by providing the opening 170 in a part of the joint 80, the capillary phenomenon of the grease L is stopped. Specifically, by providing an opening 170 between the region supported by the bearing 26 and the region where the high friction layer 50 is formed in the joint 80, the grease L is prevented from reaching the high friction layer 50. ing. And the capillary phenomenon of the grease L can be stopped reliably by adjusting the size of the opening 170 (the maximum distance d2 between the pair of notches 176 and 177).

  Note that the present invention is not limited to the case where the notches 176 and 177 for forming the opening 170 are formed in each of the pair of end surfaces 61a and 61b forming the joint 80. That is, as shown in FIG. 15D, a notch 178 is formed only in one of the pair of end surfaces 61a and 61b (for example, the end surface 61a) forming the joint 80, and the notch 178 and the end surface 61b open. 170 may be formed. The shape of the opening 170 is not limited to a rectangle, and may be a circle or the like.

  Further, the shape of the joint 80 formed in the roller body 16 may be a shape as shown in FIG. That is, in the seam 80, the first end surface 274 and the second end surface 275 are in contact with each other on the outer peripheral surface 271 a side of the roller body 271. The gap between the first end surface 274 and the second end surface 275 becomes gradually wider from the radially outer side toward the inner side. Moreover, the shape of the 1st end surface 274 and the 2nd end surface 275 becomes the same shape over the full length of the roller main body 271 except the bending part 85. FIG.

  Further, the first angle α formed by the first end surface 274 and the outer peripheral surface 271a and the second angle β formed by the second end surface 275 and the outer peripheral surface 271a are both smaller than 90 °. .

  The first end surface 274 and the second end surface 275 of the joint 80 are in contact with each other on the outer peripheral surface 271a side, and the smoothness on the outer peripheral surface 271a side is improved in the connecting portion 276. Therefore, even if the transport roller 15 rotates, the outer peripheral surface can stably contact the recording paper P. For this reason, the recording paper P can be conveyed with high accuracy.

  As shown in FIG. 16 (b), the shape of the seam 80 is such that the first angle α formed by the first end surface 274 and the outer peripheral surface 271 a of the seam 80 is smaller than 90 °, and the second end surface 275 The second angle β formed with the outer peripheral surface 271a may be formed with a size of 90 ° or more. In other words, the first end surface 274 and the second end surface 275 in the connection portion 276 may have a shape inclined in a predetermined direction with respect to the circumferential direction.

  The shape of the seam 80 is formed through the following steps. That is, after the metal plate 270 is formed by punching in the progressive press processing, end surface adjustment processing is performed on the first end surface 274 and the second end surface 275 of the metal plate 270, and the first end surface 274 and the second end surface are processed. The inclination of 275 with respect to the outer peripheral surface 271a is adjusted.

  As shown in FIG.16 (c), the inclination with respect to the outer peripheral surface 271a of the 1st end surface 274 and the 2nd end surface 275 is adjusted by press work. By this adjustment, the first angle α formed by the first end surface 274 and the outer peripheral surface 271a and the second angle β formed by the second end surface 275 and the outer peripheral surface 271a are both smaller than 90 °.

  Accordingly, when the cylindrical roller body 271 is formed by bending the metal plate 270, the first end surface 274 and the second end surface 275 are in contact with each other at least on the outer peripheral surface 271a side.

  Further, as described above, one or both of the both ends of the roller body 16 (conveyance roller 15) are connected to various connection components such as the conveyance drive gear 35 and the inner gear 39 shown in FIG. An engaging portion is formed. For example, as shown in FIGS. 17 (a) and 17 (b), on opposite positions of the roller body 16 composed of cylindrical pipes (hollow pipes), that is, on two formation surfaces that define the diameter of the roller body 16 The through holes 71a and 71a can be formed, respectively, and an engagement hole (engagement portion) 71 including the pair of through holes 71a and 71a can be formed. According to the engagement hole 71, the connecting component 72 such as a gear can be fixed by a shaft, a pin or the like (not shown).

  Further, as shown in FIGS. 18A and 18B, a D-cut engagement portion 73 can be formed at the end of the roller body 16. The engaging portion 73 is formed at the end of a cylindrical hollow pipe (roller body 16), and an opening partly cut out in a rectangular shape in plan view as shown in FIG. As a result, the outer shape of the side surface of the end portion is formed in an apparent D shape as shown in FIG.

  Therefore, by engaging a connecting part (not shown) such as a gear with the engaging portion 73 formed in an apparent D shape, the connecting part is idled with respect to the roller body 16 (conveying roller 15). It can be installed without. Further, since the engaging portion 73 is formed with a groove-like opening 73a that communicates with the internal hole of the hollow pipe (roller body 16), the connecting part can be connected to the roller body by using the opening 73a. It can be attached to 16 without making it idle. Specifically, by forming a convex portion on the connecting component and fitting the convex portion into the opening 73a, it is possible to prevent idling.

  Further, as shown in FIGS. 19A and 19B, an engaging portion 74 having a groove 74a and a D-cut portion 74b can be formed at the end of the roller body 16. In this engagement portion 74, the D cut portion 74b is formed at the outer end of the roller body 16, and the groove 74a is formed inside the D cut portion 74b. As shown in FIG. 19A, the groove 74a is formed by cutting the roller body 16 approximately half in the circumferential direction. The D-cut portion 74b has an opening 74c extending in a direction orthogonal to the groove 74a outside the groove 74a, and has a pair of bent pieces 74d and 74d on both sides of the opening 74c. That is, as shown in FIG. 19 (b), when the pair of bent pieces 74d and 74d are bent toward the central axis of the roller body 16, portions corresponding to the bent pieces 74d and 74d are The roller body 16 is recessed from the circular outer peripheral surface.

  Therefore, a connecting part (not shown) such as a gear is engaged with the groove 74a or the D-cut portion 74b without causing the connecting part to idle with respect to the roller body 16 (conveying roller 15). Can be attached. In addition, the engaging portion 74 can be attached to the roller body 16 without making it idle by using the opening 74c formed between the bent pieces 74d. Specifically, by forming a convex portion on the connecting component and fitting the convex portion into the opening 74c, it is possible to prevent idling.

  Further, as shown in FIGS. 20A and 20B, an engaging portion 75 having a groove 75 a and an opening 75 b can be formed at the end of the roller body 16. In the engaging portion 75, the opening 75b is formed at the outer end of the roller body 16, and the groove 75a is formed inside the opening 75b. As shown in FIG. 20 (a), the groove 75a is formed by cutting the roller body 16 approximately half in the circumferential direction. In the opening 75b, a part of the roller body 16 is cut out in a rectangular shape in plan view outside the groove 75a, and thereby the outer shape of the end side surface is formed in an apparent D shape as shown in FIG. Is.

  Therefore, a connecting part (not shown) such as a gear is engaged with the groove 75a or an apparently D-shaped part formed by the opening 75b, thereby connecting the connecting part to the roller body 16. It can be attached to the (conveying roller 15) without idling. Also, in this engaging portion 75, similarly to the engaging portion 73 shown in FIGS. 18 (a) and 18 (b), by using the opening 75b, the connecting component is attached to the roller body 16 without being idle. be able to.

  In order to form such engagement holes 71 and engagement portions 73, 74, and 75, the roller body 16 obtained by pressing the flat plate portion 60 is further subjected to cutting or the like. You can also. However, in that case, the cost and time efficiency are reduced by adding a separate processing step to the roller body 16 only for forming the engaging portion. Therefore, in the manufacturing method of the present invention, before the roller main body 16 is pressed in the second pressing step, a deployment engaging portion that becomes an engaging portion is formed on the flat plate portion 60 by pressing in the first pressing step. Thereafter, when the flat plate portion 60 is pressed into the roller body 16 in the second pressing step, the engaging portion is simultaneously formed.

  Specifically, when the metal plate M wound in a coil shape is punched into an elongated substantially rectangular plate-shaped flat plate portion 60, the flat plate obtained simultaneously with the processing from the large metal plate M to the small flat plate portion 60. At the end of the portion 60, a development engagement portion such as a notch shape, a protruding piece shape, a hole shape, or a groove shape is formed.

  For example, as shown in FIG. 21 (a), a pair of through holes 71a and 71a are processed at predetermined positions on the end of the flat plate portion 60, and these are used as the deployment engaging portion 76a, thereby pressing the flat plate portion 60. By processing, a pair of through-holes 71a and 71a can be made to oppose, and the engagement hole 71 shown to Fig.17 (a), (b) can be formed.

  Further, as shown in FIG. 21B, the flat plate portion 60 is pressed by cutting the end portion of the flat plate portion 60 into a predetermined shape to form a deployment engagement portion 73c including a pair of cutout portions 73b and 73b. By processing, the engaging portion 73 shown in FIGS. 18A and 18B can be formed.

  Further, as shown in FIG. 21 (c), the flat plate portion 60 is press-worked by cutting the end portion of the flat plate portion 60 into a predetermined shape by cutting out the end portion of the flat plate portion 60 as shown in FIG. 19 (a). , (B) can be formed. That is, the engagement portion 74 can be formed by forming a pair of notches (recesses) 74e, 74e and a pair of protrusions 74f, 74f as the deployment engagement portion 76b. However, in this example, after the flat plate portion 60 is pressed, it is necessary to bend the pair of projecting pieces 74f and 74f inward to form a bent piece 74d. Is slightly insufficient to increase

  Therefore, as shown in FIG. 21 (d), the flat plate portion 60 is pressed into a predetermined shape by cutting out the end portion of the flat plate portion 60 into a predetermined shape, thereby pressing the flat plate portion 60 as shown in FIG. , (B) can be formed. That is, the engaging portion 75 can be formed by forming a pair of notches (recessed portions) 75c and 75c and a pair of projecting pieces 75d and 75d as the deployment engaging portion 76c. In this example, when the flat plate portion 60 is pressed, the pair of projecting pieces 75d and 75d are also bent in an arc shape, thereby forming the opening 75b shown in FIG. 20B between the projecting pieces 75d and 75d. Can do. Therefore, it is not necessary to add further processing to the roller main body 16 formed by press processing, and thereby the cost and time efficiency of the processing steps can be sufficiently increased.

  Here, in the example shown in FIGS. 21B to 21D, the flat plate portion is formed so that the engaging portions 73, 74, and 75 shown in FIGS. 18, 19, and 20 are formed with the seam 80 interposed therebetween. Deployment engaging portions 73c, 76b, and 76c are formed at both ends of 60. Thus, by forming the deployment engaging portions 73c, 76b, and 76c at both ends, the joint 80 of the roller body 16 to be formed can be made shorter than the length of the roller body 16. Therefore, it is possible to suppress deformation of the roller body 16 due to the end surfaces 61a and 61b partially contacting and interfering when the seam 80 is formed.

  However, the present invention is not limited to this, and as shown in FIGS. 22 (a) to 22 (c), the width direction (bending direction) is not formed on the both ends of the flat plate portion 60, as shown in FIG. ) In the vicinity of the center line. That is, as shown in FIG. 22A, the engaging portion 73 shown in FIG. 18 can be formed by forming a deployment engaging portion 76d formed of an elongated rectangular cutout at the end portion. Further, by forming a deployment engaging portion 76e formed of a T-shaped notch as shown in FIG. 22B, the engaging portion 74 shown in FIG. 19 can be formed, and further, FIG. The engaging portion 75 shown in FIG. 20 can be formed by forming the development engaging portion 76f formed of a substantially T-shaped notch as shown in c).

  Thus, if the expansion | deployment formation parts 76d-76f are formed in the vicinity of the centerline in a bending direction, the engagement parts 73-75 obtained from these expansion | deployment formation parts 76d-76f can be formed more accurately.

As described above, in the method for manufacturing the transport roller 15 according to the present embodiment, when the small metal plate (first metal plate) 60 is formed from the large metal plate (second metal plate) M by pressing, the unfolding unit is used. The joint portion is also formed at the same time, and when the metal plate (first metal plate) 60 is pressed, the engaging portions 71, 73, 74, 75 are formed from the deployment engaging portion. After forming 16, it is not necessary to add a separate processing step only for forming the engaging portion.
Therefore, since the cost and time required for the added processing steps are not required, the cost of the transport roller 15 itself can be sufficiently reduced, and the productivity is improved. In particular, when the large metal plate is reduced in size, the development engaging portion is formed in a lump so that the process can be further simplified.

  In addition, as shown to Fig.11 (a), in the conveyance roller 15 (roller main body 16) which concerns on this embodiment, the joint 80 is parallel to the central axis of the roller main body 16 which consists of a cylindrical hollow pipe. However, the present invention is not limited to this, for example, a seam formed between a pair of end portions of the flat plate portion 60 serving as a base material on the outer peripheral surface of the cylindrical pipe (roller body), On a straight line parallel to the central axis of the cylindrical pipe, it may be formed so as to overlap only one or a plurality of points without overlapping the straight line with a line segment.

  Specifically, as shown in FIG. 23A, the outer peripheral surface of the roller body 16 extends in the circumferential direction so as to intersect with the seam 81 without being parallel to the central axis 16 c of the roller body 16. However, the roller body 16 may be formed so as to extend from one end to the other end. In order to form the seam 81 in this manner, as a metal plate serving as a base material, instead of an elongated rectangular flat plate portion 60, an elongated parallelogram flat plate portion 60a as shown in FIG. 23B is formed, Pressing is performed so that the straight line indicated by reference numeral 16d is the central axis. Thereby, the roller main body 16 shown in FIG. 23A is obtained, and the seam 81 is not parallel to the central axis 16c.

  In addition, in the roller main body 16 shown to Fig.23 (a), the seam 81 is formed so that it may rotate from the one end of the roller main body 16 to the other end less than one round. This is to facilitate the press working of the flat plate portion 60a. However, as shown in FIG. 23 (c), the seam 82 may be formed so as to turn one or more times around the peripheral surface from one end to the other end of the roller body 16, that is, spirally. In such a case, the angle θ in the elongated parallelogram flat plate portion 60a shown in FIG.

  In addition, as shown in FIG. 24A, the seam 83 may be formed in a wavy line composed of a curve such as a sine wave. In order to form the seam 83 in this way, as shown in FIG. 24 (b), a flat plate portion 60b in which both long sides thereof are formed in a wavy shape as a metal plate as a base material as shown in FIG. And press working so that the straight line indicated by reference numeral 16d is the central axis. In addition, since a pair of long sides formed in a wavy line are brought close to each other by press working, naturally, when one long side becomes a peak portion between corresponding points, a trough is formed on the other long side. Conversely, when one long side is a valley, the other long side is a mountain. In this example, the center line of the joint 83 is formed so as to be parallel to the center axis of the roller body 16, but the center line of the joint 83 is also formed so as not to be parallel to the center axis of the roller body 16. May be. In that case, as the metal plate to be the base material, a long and parallelogram-shaped metal plate as shown in FIG. 23 (b) and both of which long sides are formed in a wavy shape may be used. .

In addition, as shown in FIG. 25A, the seam 84 may be formed in a wavy shape bent in a hook shape. In order to form the seam 84 in this way, as a metal plate as a base material, as shown in FIG. 23 (b), it is formed in a long and narrow rectangular shape, and both long sides thereof are bent in a wavy shape. Using the flat plate portion 60c, the straight line indicated by reference numeral 16d is pressed so as to be the central axis.
Also in the flat plate portion 60c, between the portions corresponding to each other in the pair of long sides formed in a wavy line, when one long side is a peak, the other long side is a valley, and conversely, When the long side is a trough, the other long side is a crest. Also in this example, the center line of the seam 84 is formed so as to be parallel to the center axis of the roller body 16, but similarly to the case of the seam 83, it is formed so as to be non-parallel to the center axis of the roller body 16. May be.

  Further, the seam is not limited to the examples shown in FIGS. 23 to 25, and various shapes can be adopted. For example, the wavy line formed by the curve shown in FIG. 24A and the bent wavy line shown in FIG. 25A may be combined, and these may be combined with an oblique line as shown in FIG. Also good.

  If the seams 81 to 84 are formed so as to overlap only at one or a plurality of points without overlapping in a line segment with respect to a straight line parallel to the central axis of the cylindrical pipe (roller body 16), The transport roller 15 having the roller body 16 has a constant transport speed of the paper P when the paper P is transported in cooperation with the driven roller 17, that is, when the paper is fed, and transport unevenness is more sure. Will be prevented.

  That is, as shown in FIG. 26, the portion where the transport roller 15 contacts the paper P when the paper is fed is basically a straight line L on the outer peripheral surface, that is, a straight line L parallel to the central axis 16c. Therefore, when the joint 80 of the transport roller 15 (roller body 16) is parallel to the central axis 16c of the roller body 16 as shown in FIG. 7B, the entire joint 80 of the transport roller 15 is temporarily ( (Instantaneously) the sheet P is touched. Then, since the groove is not formed due to the joint 80 as described above in the transport roller 15 of the present embodiment, this is not a problem, but if the groove is formed due to the joint 80, This groove is temporarily and simultaneously in contact with the paper P, so that the entire width of the paper P is temporarily in contact with the groove due to the seam 80. As a result, the groove has a dent compared to the other outer peripheral surface of the transport roller 15, and the contact resistance with respect to the paper P is small. Therefore, the transport speed of the paper P is temporarily reduced, resulting in uneven transport. End up.

  Therefore, if the seams 81 to 84 are formed as shown in FIGS. 23A, 23C, 24A, and 25A, grooves are formed due to these seams. However, there are only one or a plurality of points where the groove contacts the paper P at the same time when the paper is fed. Therefore, there is almost no change in the contact resistance as compared with the case where the other surface (line) of the transport roller 15 hits, whereby the transport speed of the paper P becomes constant and transport unevenness is prevented.

  In addition to the above-described example, the seam of the transport roller 15 (roller body 16) made of a cylindrical hollow pipe is a straight line parallel to the central axis of the roller body 16 as shown in FIG. It may be formed having a rectangular wave-like bent portion 85 composed of a portion 85a and a linear portion 85b orthogonal thereto. Even in a joint having such a bent portion 85, if a groove is formed due to the joint, the groove simultaneously contacts the entire width of the sheet P during paper feeding. Therefore, the conveyance speed of the paper P becomes almost constant, and uneven conveyance is prevented.

  Further, the bent portion 85 may be formed over the entire length of the roller body 16 as shown in FIG. 27 (b), and the central portion thereof as shown in FIG. 27 (c). You may selectively form in the both ends except. When the bent portions 85 are formed only at both ends as shown in FIG. 27C, a space between the bent portions 85 forms a central straight portion 86 that is parallel to the central axis of the roller body 16. However, although not shown, the central straight portion between the bent portions 85 may be formed as an oblique line that is not parallel to the central axis 16c as shown in FIG.

  Further, when the bent portion 85 is formed only at both end portions and the central portion between them is the central straight portion 86, the formation region of the high friction layer 50 shown in FIG. It is preferable to correspond to the portion 86.

  When the bent portion 85 is formed at the joint, and thus the bent portion 85 is formed as a fitting portion by unevenness, the bent portion 85 (fitting portion) is fitted as designed, and the tip of the convex portion is connected to the tip. It becomes difficult to bring them close to each other with no gap between the corresponding recesses. Therefore, when the bent portion 85 is formed over the entire length of the roller body 16, the roller body 16 is likely to be distorted or twisted. Therefore, if the bent portions 85 are formed only at both ends as shown in FIG. 27C, it is possible to suppress the occurrence of such distortion and twist. In particular, by setting the central portion corresponding to the high friction layer 50, which is an area in direct contact with the paper P, to the central straight portion 86 instead of the bent portion 85, the area in direct contact with the paper P is distorted or twisted. Can be reliably prevented.

  In addition, as shown in FIG. 27B, when the bent portion 85 is formed over the entire length of the roller body 16, a seam 87 made up of the bent portion 85 as shown in FIG. A plurality of intersecting portions 87a composed of straight portions 85b, a first straight portion 87b connecting between the ends on one side of the intersecting portion 87a, and a second straight portion 87c connecting between the ends on the other side. You may form so that it may consist of. Here, the first straight portion 87b and the second straight portion 87c are formed so as to be substantially parallel to the central axis of the roller body 16, and the intersecting portion 87a is orthogonal to the first straight portion 87b and the second straight portion 87c. That is, it is formed so as to be orthogonal to the central axis of the roller body 16. Further, the second straight portion 87c is formed shorter than the first straight portion 87b.

  When the seam 87 having such a configuration is formed, in particular, the distance d3 between the pair of end portions facing each other in the second straight line portion 87c is set to be the distance d4 between the pair of end portions facing each other in the first straight line portion 87b. It is preferable to form it longer. Note that the distances d3 and d4 between the pair of end portions referred to here are both the distances between the end portions in the gap formed on the outer peripheral surface of the roller body 16.

  In this way, the accuracy of the shape and dimensions of the roller main body 16 as the cylindrical hollow pipe can be further increased, and therefore, uneven conveyance due to deformation of the roller main body 16 and the like can be prevented. That is, in the metal plate which is a base material for forming such a roller main body 16, one end portion constituting the second linear portion 87c is between a pair of adjacent intersecting portions 87a and 87a and these end portions. It becomes the convex piece 87d which makes the external shape the 2nd linear part 87c which ties. Therefore, when pressing the metal plate to bring the convex piece 87d close to the opposite end, as shown by a two-dot chain line in FIG. The sheet is not sufficiently bent into a planar shape, and is floated by a dimension t1 with respect to the opposite end, and as a result, a step is formed in the second linear portion 87c. Then, due to this step, the obtained roller main body 16 is likely to be deformed, and it is difficult to obtain good accuracy in terms of shape and dimensions.

  Therefore, by making the distance d3 between the ends of the second straight line portion 87c longer than the distance d4 between the ends of the first straight line portion 87b formed longer than the second straight line portion 87c, FIG. As shown by the solid line in (b), the dimension t2 of the floating side of the tip of the convex piece 87d is smaller (smaller) than the above-described t1, so that a step is formed in the second linear portion 87c. Can be suppressed.

  In FIG. 28 (b), the dimension t2 is also shown large for ease of understanding, but actually the dimension t2 is almost close to zero and there is no substantial step. That is, by suppressing the formation of a step in the second linear portion 87c in this way, it is possible to suppress deformation or the like of the roller body 16 due to the step and improve the accuracy of the shape and dimensions.

  In addition, as shown in FIG. 27C, when the bent portion 85 is formed only at both ends of the roller body 16, as shown in FIG. 29, the intersecting portion 87a (straight line portion 85b) in the bent portion 85 is formed. It is preferable that the distance d5 between the pair of end portions facing each other is shorter than the distance d6 between the pair of end portions facing each other at the central straight portion 86.

  In this way, the distance d5 becomes relatively short and the gap between the end portions in the intersecting portion 87a becomes very narrow. Therefore, when the metal plate serving as the base material for forming the roller body 16 is pressed The displacement in the length direction (axial direction) between the one end and the other end is regulated by the pair of opposing ends constituting the intersecting portion 87a. Accordingly, the obtained roller main body 16 (conveying roller 15) is less likely to be distorted or twisted, and conveyance unevenness due to such distortion or twist is prevented.

  In addition, as shown in FIG.27 (c), when the bending part 85 is formed only in the both ends of the roller main body 16, the convex piece 87d of this bending part 85 is comprised as shown in FIG. The distance d7 between the pair of end portions facing each other in the second straight line portion 87c may be shorter or longer than the distance d6 between the pair of end portions facing each other in the central straight line portion 86. Good.

  If the distance d7 is formed shorter than the distance d6, the gap formed between the pair of opposing ends can be more easily uniformed when the entire length of the seam is viewed, and the shape and dimensions of the roller body 16 obtained thereby can be increased. The accuracy is higher. That is, the length of the central straight line portion 86 is longer than the length of the second straight line portion 87c in the bent portion 85, and therefore, the distance between the pair of end portions in the central straight line portion 86 is more accurate than the second straight line portion 87c. Can be close. Therefore, the distance between the pair of end portions of the central straight portion 86 that can relatively improve the accuracy between the end portions is made longer than that of the second straight portion 87c to increase the gap. However, this gap can be made sufficiently uniform, and therefore, uneven conveyance due to distortion or twist of the obtained roller body 16 is prevented.

  On the other hand, if the distance d7 is formed longer than the distance d6, as shown in FIG. 28 (b), the dimension t2 of the floating portion of the tip end side of the convex piece 87d is reduced (smaller), thereby causing a step at the second linear portion 87c. Is suppressed from forming. Therefore, the formation of a step in the second linear portion 87c is suppressed in this way, so that deformation of the roller body 16 due to the step is suppressed, and the accuracy of shape and dimensions is increased, thereby causing uneven conveyance. Is prevented.

  In addition to the above-described example, for the joint of the transport roller 15 (roller body 16) formed of a cylindrical hollow pipe, for example, as shown in FIG. The angle α on the distal end side of the convex piece 88b in the bent portion 88 may be formed to be an obtuse angle (less than 180 °) with respect to the central axis of the main body 16. In this way, when the pair of end faces are brought close to each other in the press working of the metal plate, the tip of the convex piece 88b can be easily fitted into the corresponding concave portion, and therefore, the roller body 16 is distorted or twisted. Can be suppressed.

  In addition, in the structure in which the bent portion 85 is formed only at both ends as shown in FIG. 27C, the bent portion 85 is shown in FIG. 24A as shown in FIG. 30B, for example. It may be replaced with a wavy line 89a made of a curve, and further may be replaced with a bent wavy line 89b shown in FIG. 25 (a) as shown in FIG. 30 (c).

  Further, a seam may be formed by combining the rectangular wavy bent portion 85 shown in FIG. 27 (a) and the wavy line 89a made of a curve shown in FIG. 30 (b), or a rectangular wavy bent portion. A seam may be formed by combining 85 and the bent wavy line 89b shown in FIG.

  DESCRIPTION OF SYMBOLS 1 ... Inkjet printer, 15 ... Conveyance roller, 16 ... Roller main body (cylindrical body), 17 ... Driven roller, 19 ... Conveyance roller mechanism, CR ... Core member, GD ... Grinding wheel member, 147 ... Core type

Claims (7)

A bending step of forming the cylindrical body by bending the metal plate so that a pair of opposing edges of the metal plate are close to or in contact with each other;
A polishing roller manufacturing method comprising: a polishing step of polishing an outer peripheral surface of the cylindrical body in a state where a core member is disposed inside the cylindrical body formed in the bending step. The method for manufacturing a transport roller according to claim 1, wherein in the polishing step, the core member is disposed so as to penetrate the inside of the cylindrical body. 3. The method for manufacturing a transport roller according to claim 1, wherein in the polishing step, a core member that is formed in a cylindrical shape or a columnar shape and has an outer diameter equal to an inner diameter of the cylindrical body is used as the core member. . In the polishing step, the outer peripheral surface is polished by rotating the polishing member in a state in which an outer peripheral portion of the cylindrical or columnar polishing member is in contact with the outer peripheral surface of the cylindrical body. The manufacturing method of the conveyance roller as described in any one of Claims 1-3. In the bending step, the cylindrical body is formed by bending the metal plate around a shaft member;
The manufacturing method of the conveyance roller as described in any one of Claims 1-4 using the said core member as the said shaft member in the said grinding | polishing process. The manufacturing method of the conveyance roller as described in any one of Claims 1-5 which further includes the heating process of heating the said cylindrical body after the said grinding | polishing process. A core member removing step of removing the core member from the inside of the cylindrical body after the polishing step;
The method for manufacturing a transport roller according to claim 6, wherein the heating step is performed after the core member removing step.

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