JP2011110586A - Method for manufacturing transfer roller, printing apparatus, transfer unit, and transfer roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a transfer roller which, even when the end face of a metal plate before being molded into a cylindrical shaft is regulated, can improve the accuracy of the diameter, roundness and the like of the cylindrical shaft, and to provide a transfer unit and a printing apparatus. <P>SOLUTION: The method for manufacturing a transfer roller comprises disposing a pair of end faces 34, 34 of a metal plate 30 so as to face each other and molding the plate 30 into a cylindrical form. The method comprises a regulation step of regulating the angle β that at least one end face 34 of the pair of end faces 34, 34 of the metal plate 30 makes with one plate face 31b in the direction of the plate thickness of the metal plate 30 to become a larger value than 90°, and regulating both the angles α1 that one plate face 31b side of a pair of second end faces 35 in the metal plate 30 in the extended direction of the end face 34 makes with the one plate face 31b to become a larger value than 90°, and a bending step of bending a metal plate so that one plate face 31b and the other plate face 31a on the reverse side constitute an outer peripheral face to allow at least outer peripheral face sides of the pair of end faces to be abutted against each other and thus to mold the plate 30 into a cylindrical form. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transport roller manufacturing method, a printing apparatus, a transport unit, and 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 this printing apparatus is provided with a conveyance unit that conveys a recording medium that is an object to be conveyed. The transport unit has a transport roller for transporting the recording medium. A solid round bar member is generally used for the transport roller. The recording medium is held by the conveyance roller, and is conveyed by the rotation of the conveyance roller. Further, since printing is performed on the recording medium along with this conveyance, it is necessary to convey the recording medium with high positioning accuracy for proper printing.

  On the other hand, solid members have the problem of increasing weight and cost, and further weight reduction and cost reduction are being studied. Here, Patent Document 1 describes a technique for manufacturing a hollow cylindrical shaft by bending a metal plate and making a pair of end faces face each other.

JP 2006-289596 A

However, when the above prior art is applied to a conveyance roller such as a printing apparatus, there are the following problems.
For high-accuracy conveyance, it is preferable that there are no gaps, recesses, or the like facing the outer peripheral surface at locations where the pair of end surfaces of the cylindrical shaft face each other. Therefore, before the bending process of forming a substantially rectangular metal plate into a cylindrical shape, at least one of the pair of end surfaces is adjusted so that the pair of end surfaces are in contact with each other on the outer peripheral surface side without any gap. ing. As an end surface adjustment method, for example, there is a method in which a metal plate is placed in an end surface adjustment mold and pressed in the plate thickness direction.

  Here, when the metal plate is pressed in the plate thickness direction, the width in the bending direction of the metal plate may be different between the both end portions and the central portion in the longitudinal direction. When a cylindrical shaft is formed by bending metal plates having different widths, there are problems that the diameter and roundness of the cylindrical shaft are not stable, and that the cylindrical shaft is likely to be warped. Further, when such a cylindrical shaft is used as a transport roller, there is a problem that it is difficult to transport the recording medium with high positioning accuracy.

  The present invention has been made in view of such circumstances, and even if the end surface of the metal plate before being formed into the cylindrical shaft is adjusted, the accuracy of the diameter and roundness of the cylindrical shaft is improved. It is an object of the present invention to provide a method for manufacturing a transport roller, a transport unit, and a printing apparatus that can be improved.

In order to solve the above problems, the present invention employs the following means.
The present invention relates to a method of manufacturing a transfer roller formed into a cylindrical shape with a pair of end faces of a metal plate facing each other, and at least one end face of the pair of end faces of the metal plate and one in the thickness direction of the metal plate. The angle formed with the plate surface is adjusted so as to be larger than 90 °, and is formed by the one plate surface side and the one plate surface of the pair of second end surfaces in the metal plate in the extending direction of the end surface. An adjustment step for adjusting both angles to be larger than 90 °, and bending the metal plate so that the other plate surface opposite to the one plate surface is the outer peripheral surface, and at least the outer peripheral surface side of the pair of end surfaces is mutually And a bending step of forming a cylindrical shape by contact with each other.
When press working is used to adjust the end face, both ends of the metal plate in the extending direction are displaced so as to be separated from each other. On the other hand, since the central part in the extending direction is between both end parts and the mold, the displacement is restricted. Therefore, after adjustment of the end surface, the width of the central portion tends to be wider than both end portions of the metal plate. In the adjustment process of the present invention, the pair of second end faces are adjusted in the same manner together with the pair of end faces. By adjusting the second end surface, the displacement of the second end surface is regulated, and in the adjusting step, the both end portions in the extending direction of the metal plate are regulated to be separated from each other and displaced. Therefore, by adjusting the pair of end surfaces, it is possible to suppress the respective widths of the both end portions and the central portion of the metal plate from being different.

Further, in the present invention, before the bending step, an angle formed between the other plate surface side of at least one second end surface of the pair of second end surfaces and the other plate surface is larger than 90 °. The method of having the 2nd adjustment process to adjust is employ | adopted.
In this invention, while having an adjustment process which adjusts a 2nd end surface from the one board surface side, it has a 2nd adjustment process which adjusts a 2nd end surface from the other board surface side. Therefore, the stress remaining inside the metal plate by adjusting from one side can be offset by adjusting from the opposite side. Therefore, distortion, deformation, etc. when the cylindrical shaft is formed are reduced. Further, since the second end surface becomes an end portion in the axial direction after the cylindrical shaft is formed, the chamfered portion at the end portion of the cylindrical shaft is formed by adjusting the second end surface from the other plate surface side.

Moreover, this invention employ | adopts the method of adjusting both a pair of end surfaces in an adjustment process.
In the present invention, adjustment is performed on either of the pair of end faces. Since stress due to adjustment similarly occurs on the pair of end faces and the vicinity thereof, it becomes possible to prevent distortion, deformation, and the like caused by uneven stress when the metal plate is formed on the cylindrical shaft.

Moreover, this invention employ | adopts the method of adjusting only one end surface in an adjustment process.
In the present invention, since the other end face of the pair of end faces is not adjusted, the face is substantially parallel to the radial direction of the cylindrical shaft. One end face is adjusted to be inclined along a predetermined circumferential direction of the cylindrical shaft. By rotating the transport roller in the direction along this inclination and transporting the transported object, even if a biasing force is applied from the transported object to the connecting portion of the pair of end surfaces, the pair of end surfaces are prevented from separating from each other. It becomes possible to do.

Moreover, this invention employ | adopts the method that the internal peripheral surface side of a pair of end surface has a clearance gap in a bending process.
In the present invention, since a gap is formed on the inner peripheral surface side of the pair of end surfaces, when a force such as bending or twisting is applied to the cylindrical shaft, the pair of end surfaces abut on each other on the inner peripheral surface side. A gap or the like is prevented from occurring on the outer peripheral surface side. Therefore, the pair of end surfaces can be reliably brought into contact only on the outer peripheral surface side.

  The present invention also relates to a printing apparatus having a cylindrical roller which is formed in a cylindrical shape with a pair of end faces of a metal plate facing each other, and the pair of end faces are in contact with each other on the outer peripheral surface side and are internally connected. A configuration in which a gap is formed on the peripheral surface side, and an angle formed between the inner peripheral surface side and the inner peripheral surface of the pair of second end surfaces at both ends in the axial direction of the transport roller is larger than 90 °. Is adopted.

  Further, the printing apparatus according to the present invention employs a configuration in which an angle formed between the outer peripheral surface side and the outer peripheral surface of at least one second end surface of the pair of second end surfaces is larger than 90 °.

  Further, the present invention is a transport unit including a transport roller formed in a cylindrical shape with a pair of end faces of a metal plate facing each other, and the pair of end faces are in contact with each other on the outer peripheral surface side and a gap is formed on the inner peripheral surface side. And the angle formed between the inner peripheral surface side and the inner peripheral surface of the pair of second end surfaces at both ends in the axial direction of the transport roller is larger than 90 °.

  Further, the present invention is a conveyance roller formed in a cylindrical shape with a pair of end faces of a metal plate facing each other, the pair of end faces being in contact with each other on the outer peripheral face side and having a gap on the inner peripheral face side, A configuration is adopted in which the angles formed by the inner peripheral surface side and the inner peripheral surface of the pair of second end surfaces at both ends in the direction are both greater than 90 °.

1 is an overall configuration diagram of a printer 1. FIG. FIG. 3 is a schematic diagram illustrating configurations of a conveyance unit 3 and a paper discharge unit 4. 3 is a schematic diagram illustrating a configuration of a transport roller 13. FIG. It is the schematic which shows the structure of 13 A of 2nd conveyance rollers. FIG. 6 is a flowchart showing a process of forming the transport roller 13. 3 is a plan view of a large metal plate 60. FIG. 3 is a plan view of a metal plate 30. FIG. It is sectional drawing which shows the process of a punching process. It is the schematic which shows arrangement | positioning of the metal plate 30 in an end surface adjustment process. It is the schematic which shows the process of an end surface adjustment process. FIG. 5 is a schematic view showing the first half of the bending process for the metal plate 30. FIG. 5 is a schematic diagram showing a second half process of bending a metal plate 30. FIG. 6 is a schematic view showing a step of separating the roller body 31 from the frame portion 62. (A) is a perspective view of the conveyance roller 13, (b) is an end sectional view. (A) is an end perspective view of the roller body 31, and (b) is a front view. (A) is an end perspective view of the roller body 31, and (b) is a front view. (A) is an end perspective view of the roller body 31, and (b) is a front view. (A)-(d) is a top view of the metal plate 30 which shows an expansion | deployment engaging part. (A)-(c) is a top view of the metal plate 30 which shows an expansion | deployment engaging part. (A), (c) is a top view which shows the shape of the joint of the roller main body 31, (b) is a top view of 30 A of metal plates. (A) is a top view which shows the shape of the joint of the roller main body 31, (b) is a top view of the metal plate 30B. (A) is a top view which shows the shape of the joint of the roller main body 31, (b) is a top view of 30 C of metal plates. FIG. 6 is a perspective view illustrating a relationship between a transport roller 13 and a recording paper P during transport. (A)-(c) is a top view which shows the shape of the joint of the roller main body 31. FIG. (A)-(c) is a top view which shows the shape of the joint of the roller main body 31. FIG. 3 is a plan view showing a shape of a joint of a roller body 31. FIG. (A) is a top view of the conveyance roller 13, (b) is a sectional view taken along line HH of (a), and (c) is a plan view showing a modification of the opening 90. It is the schematic which shows the structure of the 3rd conveyance roller 13B. It is a flowchart which shows the process of shape | molding the 3rd conveyance roller 13B. It is the schematic which shows arrangement | positioning of the metal plate 30 in a 2nd end surface adjustment process. It is the schematic which shows the process of a 2nd end surface adjustment process.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In each drawing used for the following description, the scale of each member is appropriately changed in order to make each member a recognizable size. In the following description, an example of an ink jet printer (hereinafter simply referred to as “printer”) that records information such as characters and images by ejecting ink onto paper or the like as a recording medium will be described as a printing apparatus.

[First Embodiment]
The configuration of the printer 1 according to the present embodiment will be described with reference to FIG.
FIG. 1 is an overall configuration diagram of a printer 1 according to the present embodiment.
The printer (printing apparatus) 1 is a printing apparatus that records information such as characters and images by ejecting ink onto recording paper P that is a recording medium. The printer 1 includes a paper feed unit 2, a conveyance unit (conveyance unit) 3, a paper discharge unit 4, a head unit 5, and a control unit CONT.

  The paper feed unit 2 holds the recording paper P and supplies the recording paper P toward the transport unit 3, and includes a paper feed tray 11 and a paper feed roller 12. The paper feed tray 11 holds a plurality of recording papers P. As the recording paper P, a sheet-like recording medium capable of printing with ink is used, and plain paper, coated paper, an OHP (overhead projector) sheet, glossy paper, glossy film, and the like are used.

  The paper feed roller 12 is a roller that rotates to supply the recording paper P toward the transport unit 3, and is provided on the transport unit 3 side of the paper feed tray 11. A separation pad (not shown) is provided at a position facing the outer peripheral surface of the paper feed roller 12, and the separation pad and the paper feed roller 12 cooperate to feed the recording paper P one by one. Can be supplied to.

  The transport unit 3 transports the recording paper P supplied from the paper feeding unit 2 toward the paper discharge unit 4 and is a place where a printing operation is performed on the recording paper P. The conveyance part 3 has the conveyance roller 13, the driven roller 14, the platen 15, the diamond rib 16, and the drive part 6 (refer FIG. 2).

  The conveyance roller 13 is a roller for accurately conveying the recording paper P to a predetermined printing position by rotating. The conveyance roller 13 extends in a direction perpendicular to the paper feeding direction of the paper feeding unit 2 and in a horizontal direction. It is the shaft member shape | molded in the shape. The transport roller 13 is rotatably supported by a pair of substantially U-shaped bearings (not shown) provided in the transport unit 3 and is rotated by driving of the drive unit 6. Details of the transport roller 13 will be described later.

  The driven roller 14 is a substantially cylindrical member, and a plurality of the driven rollers 14 are arranged at intervals along the axial direction of the transport roller 13. The driven roller 14 is rotatably provided at a position facing a high friction layer 32 (see FIG. 3) of the transport roller 13 described later. The driven roller 14 is provided with a biasing spring (not shown), and the driven roller 14 is biased and brought into contact with the high friction layer 32 of the transport roller 13 by the biasing force of the biasing spring. For this reason, the driven roller 14 rotates following the rotation of the transport roller 13, and the recording paper P can be held between the transport roller 13. Note that the outer peripheral surface of the driven roller 14 is subjected to low wear treatment such as fluororesin coating in order to reduce wear and damage due to sliding with the high friction layer 32.

  The platen 15 is a portion that supports the recording paper P from below when printing on the recording paper P by the head unit 5, and has an upper surface substantially parallel to the horizontal plane. The diamond ribs 16 are protrusions that protrude upward from the upper surface of the platen 15, and a plurality of diamond ribs 16 are arranged at intervals along the axial direction of the transport roller 13. The top surface of the diamond rib 16 is formed substantially parallel to the horizontal plane, and the recording paper P during printing is supported from below by this top surface.

  The paper discharge unit 4 discharges the printed recording paper P from the transport unit 3 and includes a paper discharge roller 17 and a paper discharge jagged roller 18. The paper discharge roller 17 and the paper discharge jagged roller 18 can rotate in directions opposite to each other, and the recording paper P is pulled out and discharged by this rotation.

  The head unit 5 ejects ink onto the recording paper P placed on the transport unit 3, and includes an ejection head 19 and a carriage 20. The ejection head 19 is a device that ejects ink in accordance with an instruction from the control unit CONT, and an ejection port (not shown) is provided to face the top surface of the diamond rib 16. The carriage 20 holds the ejection head 19 below, and is provided so as to be reciprocally movable in the axial direction of the transport roller 13. The carriage 20 is connected to a drive unit (not shown) that reciprocates the carriage 20 in accordance with an instruction from the control unit CONT.

Next, the structure which rotates the conveyance roller 13 is demonstrated with reference to FIG.
2A and 2B are schematic views showing the configuration of the transport unit 3 and the paper discharge unit 4, where FIG. 2A is a plan view, and FIG. 2B is a view taken in the direction of arrow A in FIG.

  As described above, the transport unit 3 has the drive unit 6. The drive unit 6 rotates the transport roller 13 and includes a motor 21 and a pinion gear 22. The motor 21 is an electric motor that rotates the transport roller 13 in accordance with an instruction from the control unit CONT. The controller CONT controls the rotation of the motor 21 to control the rotation of the transport roller 13, and the recording paper P can be transported with high positioning accuracy. The pinion gear 22 is a gear that is integrally connected to the output shaft of the motor 21.

  A first drive gear 23, a second drive gear 24, and a third drive gear 25 are attached to the transport roller 13. The first drive gear 23 is a gear for rotating the transport roller 13 and is integrally attached to the end of the transport roller 13 on the drive unit 6 installation side by press-fitting. The first drive gear 23 meshes with the pinion gear 22, and the driving force of the motor 21 is transmitted to the transport roller 13 through the pinion gear 22 and the first drive gear 23 to rotate the transport roller 13. Yes.

  The second drive gear 24 is a gear for transmitting the driving force of the motor 21 to the paper discharge roller 17, has a smaller diameter than the first drive gear 23, and is adjacent to the first drive gear 23. Fixed. The second drive gear 24 is integrally attached to the transport roller 13 by press-fitting.

  The third drive gear 25 is a gear for transmitting the rotational driving force of the transport roller 13 to another device (not shown), and is press-fitted into the end of the transport roller 13 opposite to the first drive gear 23. Connected together. A configuration in which the third drive gear 25 rotates in synchronization with the transport roller 13 by providing a rotation stopper (a pin, a notch, or the like) in each of the transport roller 13 and the third drive gear 25 without using press-fitting. It is good.

  A paper discharge drive gear 26 is integrally attached to an end of the paper discharge roller 17 on the drive unit 6 side. An intermediate gear 27 is provided between the paper discharge drive gear 26 and the second drive gear 24, and the intermediate gear 27 meshes with each of the second drive gear 24 and the paper discharge drive gear 26. That is, the driving force of the motor 21 is transmitted to the paper discharge roller 17 via the second drive gear 24, the intermediate gear 27 and the paper discharge drive gear 26, and the paper discharge roller 17 is rotated.

Next, the configuration of the transport roller 13 will be described with reference to FIG.
3A and 3B are schematic views illustrating the configuration of the transport roller 13, where FIG. 3A is a side view, FIG. 3B is a cross-sectional view taken along line B-B in FIG. 3A, and FIG. 36 is an enlarged view of the vicinity of 36, and (d) is an end sectional view of (a). The conveyance roller 13 is a shaft member formed in a cylindrical shape, and includes a roller body 31 and a high friction layer 32.

  The roller body 31 is a shaft member formed by bending a metal plate having a substantially constant plate thickness into a cylindrical shape. Although a steel plate is used as the metal plate, a metal plate such as aluminum or stainless steel may be used. The roller body 31 is formed in a cylindrical shape with a pair of end faces 34, 34 of a metal plate facing and abutting each other. A contact portion between the pair of end surfaces 34, 34 is a joint 36. The joint 36 extends in parallel with the central axis direction of the roller body 31.

  The pair of end surfaces 34, 34 abut on each other on the outer peripheral surface (other plate surface) 31 a side of the roller body 31 without any gap. That is, in the joint 36, there are no gaps, recesses, or the like that open to the outer peripheral surface 31a side. Therefore, the contact between the outer peripheral surface 31a and the recording paper P can always be maintained when the transport roller 13 rotates. A gap 37 is formed on the inner peripheral surface (one plate surface) 31 b side of the roller body 31 between the pair of end surfaces 34, 34. The gap 37 has a shape that gradually becomes wider toward the inner peripheral surface 31b.

  A pair of second end surfaces 35 and 35 are provided at both ends of the roller body 31 in the axial direction. Since the second end surface 35 is an end surface of the cylindrical roller body 31, it is formed in an annular shape. The second end face 35 is gradually inclined toward the central part in the axial direction as it goes from the outer peripheral face 31a to the inner peripheral face 31b. The first angle α1 formed by the inner peripheral surface 31b side of the second end surface 35 and the inner peripheral surface 31b is greater than 90 °.

  The roller body 31 has a plating layer 38 formed on the surface thereof. The plating layer 38 is formed on the surfaces of the outer peripheral surface 31a, the inner peripheral surface 31b, the pair of end surfaces 34, 34, and the pair of second end surfaces 35, 35. The plating layer 38 may be formed using any method of electroplating and electroless plating, and may be formed by overlapping a plurality of plating layers. As the type of plating, for example, nickel plating, zinc plating, chromium plating or the like is used.

  The high friction layer 32 is a coating layer that is formed on the outer peripheral surface 31 a other than both end portions of the roller body 31, improves the coefficient of friction with the recording paper P, and securely holds the recording paper P. In order to transport the recording paper P with high positioning accuracy, the transport roller 13 needs to hold the recording paper P without slipping. Therefore, in the area of the outer peripheral surface 31a where the recording paper P being transported is held. A high friction layer 32 is formed in a certain holding region F.

  The high friction layer 32 has a resin layer made of an epoxy resin, a polyester resin, or the like, and ceramic particles dispersed and arranged on the surface of the resin layer. Aluminum oxide (alumina), silicon carbide, silicon dioxide or the like is used for the ceramic particles. The particle diameter of the ceramic particles is adjusted by a crushing process, and the crushing process allows the ceramic particles to have a sharp end surface and improve the coefficient of friction with the recording paper P. Instead of the high friction layer 32, the friction coefficient between the recording paper P and the recording paper P may be improved by forming fine irregularities (satin finish etc.) on the outer peripheral surface 31a.

Instead of the above-described transport roller 13, a second transport roller (transport roller) 13A that is a modified example thereof may be used. The 2nd conveyance roller 13A which is one modification of the conveyance roller 13 is demonstrated with reference to FIG.
FIG. 4 is a schematic diagram illustrating the configuration of the second transport roller 13A. Note that FIG. 4 corresponds to FIG. 3C, and the same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  The second transport roller 13A has a second roller body 31A and a high friction layer 32. The second roller body 31A is a shaft member formed by bending a metal plate having a substantially constant plate thickness into a cylindrical shape, and has a joint 36 where a pair of end faces 34, 34 of the metal plate are in contact with each other. One end surface 34a, which is one of the pair of end surfaces 34, 34, gradually inclines toward the opposite side of the other end surface 34b which is the other end surface as it advances from the outer peripheral surface 31a side to the inner peripheral surface 31b side. Is formed. On the other hand, the other end surface 34b is formed substantially parallel to the radial direction of the second roller body 31A.

  The one end face 34a and the other end face 34b are in contact with each other without a gap on the outer peripheral face 31a side. That is, in the joint 36, there are no gaps, recesses, or the like that open to the outer peripheral surface 31a side. A second gap (gap) 37A is formed on the inner peripheral surface 31b side between the one end face 34a and the other end face 34b. The second gap 37A has a shape that gradually becomes wider toward the inner peripheral surface 31b.

Next, a method for forming the transport roller 13 will be described with reference to FIGS.
FIG. 5 is a flowchart showing a process of forming the transport roller 13, where (a) is an overall flowchart, and (b) is a detailed flowchart of progressive press processing in (a).

  As shown in FIG. 5A, the outline of the forming process of the transport roller 13 is first a cylindrical shape by progressive press processing (a process in which punching and pressing are continuously performed) from a large metal plate as a material. The roller body 31 is formed (step S1).

  As shown in FIG. 5B, details of the progressive press processing in step S1 are first formed from a large metal plate by punching to form a substantially rectangular metal plate (step S11). Next, end surface adjustment processing is performed in which the pair of end surfaces 34, 34 and the pair of second end surfaces 35, 35 of the metal plate 30 are adjusted by press processing (step S12). Finally, the roller body 31 is formed by bending the metal plate into a cylindrical shape by bending using press working (step S14).

  Subsequently, as shown in FIG. 5A, the outer peripheral surface of the roller body 31 is polished (centerless polishing), and its diameter, roundness and warpage are adjusted (step S2). Next, a plating process is performed on the surface of the roller body 31 to form a plating layer 38 (step S3). Finally, the high friction layer 32 is formed on the outer peripheral surface 31a of the roller body 31 (step S4). Thus, the forming of the transport roller 13 is completed. In the following description, step S1 which is a step of forming the roller body 31 from a large metal plate by progressive press working will be described in detail.

The process (step S1) of forming the roller body 31 from a large metal plate by progressive pressing will be described with reference to FIGS. First, the punching process (step S11) will be described with reference to FIGS.
FIG. 6 is a plan view of a large metal plate 60 that is a material of the roller body 31.
FIG. 7 is a plan view of the metal plate 30.
FIG. 8 is a cross-sectional view showing a punching process.

  A progressive press process is used for forming the roller body 31 in the present embodiment. This processing method sequentially punches and presses the metal plate while conveying the metal plate as a material at a constant pitch.

  First, a large metal plate 60 as shown in FIG. 6 is prepared. The large metal plate 60 is a substantially rectangular steel plate having a thickness of about 1 mm, and an electrogalvanized steel plate (SECC) or a cold rolled steel plate (SPCC) is used. A plurality of holes 61 are provided at predetermined intervals along the edges of the pair of edges of the large metal plate 60 in the vertical direction of the drawing. The hole 61 is used to convey the large metal plate 60 at a constant pitch when performing progressive press processing on the large metal plate 60, and the large metal plate 60 is provided at every interval between adjacent hole portions 61. To be transported.

  Next, as shown in FIG. 7, a substantially rectangular metal plate 30 is formed from the large metal plate 60 by punching (step S11) in the progressive press processing (step S1). That is, the region S is punched from the large metal plate 60 to form the metal plate 30 and the frame portion 62. The metal plate 30 is a substantially band-shaped rectangular metal plate extending in a direction (vertical direction in the drawing) perpendicular to the progressive direction of the large metal plate 60, and the region S is removed from the large metal plate 60. Molded. In addition, since the board surface of the front and back in the plate | board thickness direction in the metal plate 30 becomes an inner peripheral surface of the roller main body 31, it is called the outer peripheral surface 31a and the internal peripheral surface 31b for convenience below. In FIG. 7, the front side of the metal plate 30 is defined as an inner peripheral surface 31 b and the back side of the paper is defined as an outer peripheral surface 31 a.

  A pair of end surfaces 34 and 34 of the metal plate 30 in a direction orthogonal to the extending direction of the metal plate 30 is a place where the metal plate 30 is in contact with each other to form a joint 36 when formed into a cylindrical shape. The pair of end surfaces 34, 34 after punching are both substantially orthogonal to the outer peripheral surface 31a and the inner peripheral surface 31b. The pair of end faces 34, 34 are parallel to each other.

  The second end surfaces 35 and 35 that are a pair of end surfaces of the metal plate 30 in the extending direction of the end surface 34 are portions that become end surfaces at both ends of the roller body 31 when the metal plate 30 is formed into a cylindrical shape. . The pair of second end surfaces 35, 35 after the punching process are substantially orthogonal to the outer peripheral surface 31a and the inner peripheral surface 31b. The pair of second end surfaces 35 and 35 are parallel to each other.

  The frame portion 62 is a substantially strip-shaped plate portion that extends in a direction substantially orthogonal to the extending direction of the metal plate 30, and is formed by removing the region S from the large metal plate 60. In the frame portion 62, the hole portions 61 described above are arranged side by side. A connecting portion 63 (so-called tie bar) is connected between the metal plate 30 and the frame portion 62, and the metal plate 30 is supported by the frame portion 62 via the connecting portion 63. The connecting portion 63 is connected to the central portion of the pair of second end surfaces 35 and 35, respectively.

In addition, it is preferable that the fracture surface, the burr | flash, etc. which are formed in the end surface (cut surface) of the metal plate 30 at the time of a punching process are arrange | positioned inside a bending direction in the bending process mentioned later.
The metal plate 30 is formed from the large metal plate 60 by punching as shown in FIG. First, as shown in FIG. 8A, a male die 101 and a female die 102, which are punching dies, are arranged on both sides of the large metal plate 60 in the thickness direction. Next, as shown in FIG. 8B, the male mold 101 is moved to the female mold 102 side, the large metal plate 60 is cut with these molds, and the metal plate 30 is formed.

  On the cut surface of the metal plate 30, that is, the pair of end surfaces 34, 34, a sag sd, a shear surface sp, a fracture surface bs, and a burr (not shown) may be formed. Here, the upper surface of the paper surface connected to the relatively smooth sagging sd is referred to as the outer peripheral surface 31a, and the lower surface of the paper surface that is connected to the fracture surface bs and may cause burrs is referred to as the inner peripheral surface 31b. By bending the metal plate 30 in such a direction, it is possible to prevent the pair of end surfaces 34 and 34 from being separated from each other due to the fracture surface bs or burr when the roller body 31 is formed.

  Further, by bending the metal plate 30 in the above direction and bringing the pair of end surfaces 34 and 34 into contact with each other, the fracture surface bs and burrs are provided inside the roller body 31 and can be prevented from protruding from the outer peripheral surface 31a. . Therefore, the deburring process can be omitted and the productivity of the roller body 31 can be improved.

Next, end face adjustment processing (step S12) is performed on the pair of end faces 34, 34 and the pair of second end faces 35, 35 of the metal plate 30. The end face adjustment processing will be described with reference to FIGS. 9 and 10.
9A and 9B are schematic views showing the arrangement of the metal plate 30 in the end face adjustment processing, where FIG. 9A is a cross-sectional view and FIG. 9B is a bottom view of the adjustment female die 110. 9 is a cross-sectional view taken along line CC in FIG.
10A and 10B are schematic views showing the steps of end face adjustment processing, where FIG. 10A is a plan view of the metal plate 30 at the time of adjustment, FIG. 10B is a cross-sectional view taken along line DD of FIG. (B) is the enlarged view of the metal plate 30, (d) is the EE sectional view taken on the line (a).

  As shown in FIG. 9, a metal plate 30 is disposed between the adjustment female mold 110 and the adjustment male mold 120 used for the end face adjustment processing. Here, it arrange | positions in the direction which the inner peripheral surface 31b side of the metal plate 30 opposes the female die 110 for adjustment. The adjustment female mold 110 is formed with a recess 111 in which the metal plate 30 is disposed. The recess 111 extends in the extending direction of the metal plate 30 and is formed to face the adjustment male mold 120. The recess 111 includes a bottom surface 112, a pair of inner side surfaces 113, 113, and a pair of inner side surfaces 114, 114. I have. The bottom surface 112 is a surface with which the plate surface in the thickness direction of the metal plate 30 abuts, and is formed in a planar shape facing the adjustment male mold 120.

  The pair of inner side surfaces 113, 113 are planar side surfaces for adjusting the pair of end surfaces 34, 34 of the metal plate 30, and both extend in parallel to the extending direction of the metal plate 30 and in one direction. Is formed. The pair of inner side surfaces 113, 113 extend in parallel with each other. The pair of inner side surfaces 113, 113 is inclined so as to be gradually separated from the bottom surface 112 toward the adjustment male mold 120. That is, the width between the pair of inner side surfaces 113 is gradually increased from the bottom surface 112 toward the adjustment male mold 120.

  The pair of inner side surfaces 114, 114 are planar side surfaces for adjusting the pair of second end surfaces 35, 35 of the metal plate 30, and both are parallel to the width direction of the metal plate 30 and in one direction. It is formed to extend. The pair of inner side surfaces 114, 114 extend in parallel to each other. The pair of inner side surfaces 114, 114 are inclined so as to be gradually separated from the bottom surface 112 toward the adjustment male mold 120. That is, the width between the pair of inner side surfaces 114, 114 gradually increases from the bottom surface 112 toward the adjustment male mold 120. The pair of inner side surfaces 114, 114 are both connected to an opening 114 a through which the connecting portion 63 passes.

  The adjustment male mold 120 is provided with a convex portion 121 protruding toward the adjustment female mold 110 side. The top surface of the convex portion 121 on the adjustment female mold 110 side is formed in a planar shape parallel to the bottom surface 112. The protruding height of the convex portion 121 is set to a size that can be adjusted by pressing the metal plate 30 disposed in the concave portion 111.

  As shown in FIG. 10, the adjustment female die 110 and the adjustment male die 120 are brought into contact with each other, and the metal plate 30 is pressed. Here, since the metal plate 30 is pressed in the plate thickness direction, the metal plate 30 tends to extend in both the width direction and the extending direction. However, the adjustment female mold 110 of the present embodiment includes not only a pair of inner side surfaces 113 and 113 for adjusting the pair of end surfaces 34 and 34 but also a pair of adjustments for the pair of second end surfaces 35 and 35. Inner side surfaces 114, 114 are also provided. Therefore, the displacement of the pair of second end surfaces 35, 35 in the direction away from each other is restricted, and the displacement of both ends in the extending direction of the metal plate 30 is also restricted. Therefore, it can suppress that the width | variety of the metal plate 30 differs by the end surface adjustment process by the center part and both ends in the extending direction. In addition, when the cylindrical roller body 31 is formed from the metal plate 30 in a bending process described later, the roller body 31 having a highly accurate diameter, roundness, and the like can be formed.

  Since the metal plate 30 extends in the region of the recess 111 by the end surface adjustment processing, the pair of end surfaces 34, 34 of the metal plate 30 is adjusted along the inclination of the pair of inner side surfaces 113, 113 of the adjustment female mold 110. The That is, the angle of the pair of end surfaces 34, 34 with respect to the inner peripheral surface 31b is adjusted. The angles β and β formed by the pair of end surfaces 34 and 34 and the inner peripheral surface 31b are both greater than 90 °.

  Similarly, the pair of second end surfaces 35, 35 of the metal plate 30 are adjusted along the inclination of the pair of inner side surfaces 114, 114 of the adjustment female mold 110. That is, the angle of the pair of second end surfaces 35, 35 on the inner peripheral surface 31b side with respect to the inner peripheral surface 31b is adjusted. The first angles α1 and α1 formed by the inner peripheral surface 31b side of the pair of second end surfaces 35 and 35 and the inner peripheral surface 31b are both greater than 90 °.

Further, by performing end face adjustment processing, the outer peripheral surface width W ₁ that is the length in the width direction of the outer peripheral surface 31a is larger than the inner peripheral surface width W ₂ that is the length in the width direction of the inner peripheral surface 31b. It is getting wider. Therefore, when the cylindrical roller body 31 is formed by bending the metal plate 30, it is easy to bring the pair of end surfaces 34, 34 into contact with each other on the outer peripheral surface 31a side.

  In the end surface adjustment processing of the present embodiment, processing is performed on both of the pair of end surfaces 34 and 34. Therefore, for example, even when a stress or the like due to processing is generated in the vicinity of the pair of end surfaces 34 and 34, the stress is generated in both of the pair of end surfaces 34 and 34. Therefore, the metal plate 30 is bent. In the transport roller 13 (roller body 31) formed in this manner, distortion, deformation, and the like caused by stress non-uniformity can be suppressed.

In addition, you may perform the end surface adjustment process with respect to a pair of end surfaces 34 and 34 mentioned above only to either one of a pair of end surfaces 34 and 34 (for example, only one end surface 34a). By adjusting in this way, the 2nd roller main part 31A shown in FIG. 4 can be shape | molded.
In this case, the one end surface 34a in the joint 36 has a shape inclined in a predetermined direction with respect to the circumferential direction. When the recording paper P is transported by rotating the second transport roller 13A in the direction along this inclination, the pair of end surfaces 34 and 34 are separated even if the urging force accompanying the transport is applied to the joint 36. It becomes difficult. Therefore, it is possible to suppress distortion, deformation, and the like of the second transport roller 13A that may occur with transport.

  Moreover, you may perform the end surface adjustment process with respect to a pair of end surfaces 34 and 34 mentioned above only to the location corresponding to the holding | maintenance area | region F shown in FIG.

Next, the metal plate 30 is subjected to bending processing (step S14) in the progressive press processing shown in FIGS. 11 and 12, and the metal plate 30 is formed into a cylindrical shape.
11A and 11B are schematic views showing the first half of the bending process for the metal plate 30, wherein FIG. 11A is a cross-sectional view showing the first step, FIG. 11B is a cross-sectional view showing the second step, and FIG. ) Is a cross-sectional view showing the arrangement of the cored bar 208 used in the bending process.
12A and 12B are schematic views showing the second half of the bending process for the metal plate 30, wherein FIG. 12A is a cross-sectional view showing the third step, and FIG. 12B is a cross-sectional view showing the fourth step. ) Is a cross-sectional view showing the fifth step. 11 and 12 are cross-sectional views taken along line CC in FIG.

  First, as shown in FIG. 11A, the metal plate 30 is pressed by the first male mold 201 and the first female mold 202, and both edges in the width direction of the metal plate 30 are bent into a substantially arc shape. In FIG. 11A, gaps are formed between the metal plate 30 and the first male mold 201 and the first female mold 202, respectively, but these gaps do not actually exist, and the metal plate 30 and the first male mold 201 and the first female mold 202 are in close contact with each other. The same applies to FIGS. 11B and 12A to 12C.

  Next, as shown in FIG. 11B, the metal plate 30 is pressed by the second male mold 203 and the second female mold 204, and the central portion in the width direction of the metal plate 30 is bent into a substantially arc shape. By this bending process, the cross-sectional shape of the metal plate 30 becomes a substantially C-shape opening to the second male mold 203 side.

  Next, as shown in FIG. 11 (c), the metal plate 30 formed in a substantially C shape in cross section is disposed between the first upper mold 205 and the second upper mold 206 and the lower mold 207, In addition, a cylindrical cored bar 208 is disposed inside the metal plate 30. Here, the press surfaces 205a, 206a and 207a of the first upper mold 205, the second upper mold 206 and the lower mold 207 all have shapes corresponding to the outer peripheral surface 31a of the roller body 31 to be molded. Yes. Moreover, the outer peripheral surface of the cored bar 208 has a shape corresponding to the inner peripheral surface 31b of the roller body 31 to be molded. Note that the first upper mold 205 and the second upper mold 206 are movable independently of each other.

  Next, as shown in FIG. 12A, the first upper mold 205 is moved toward the lower mold 207 with the core metal 208 stationary, and one of the pair of end faces 34, 34 of the metal plate 30. Press the side and bend it into a semi-circular shape. As in the case of the first upper mold 205 and the second upper mold 206, the lower mold 207 is a pair of split molds, and the lower mold on the same side as the first upper mold 205 in the process shown in FIG. May be moved toward the first upper mold 205.

  Next, as shown in FIG. 12B, the cored bar 208 is moved slightly toward the lower mold 207, and the second upper mold 206 is moved toward the lower mold 207, so that a pair of end surfaces of the metal plate 30 is obtained. The other side of 34, 34 is pressed and bent into a substantially semicircular shape.

  Next, as shown in FIG. 12C, the first upper mold 205, the second upper mold 206 and the cored bar 208 are all moved toward the lower mold 207 to press the metal plate 30. At this time, the first upper mold 205 and the second upper mold 206 are in contact with the lower mold 207. By this pressing, the metal plate 30 is formed into a substantially cylindrical shape, and the roller body 31 is formed from the metal plate 30. In this step, the pair of end surfaces 34, 34 of the metal plate 30 abut on each other on the outer peripheral surface 31a side. On the other hand, a gap 37 is formed on the inner peripheral surface 31 b side of the pair of end surfaces 34, 34.

  In the present embodiment, even if the end face adjustment processing is performed on the metal plate 30, the displacement of the pair of second end faces 35, 35 is restricted, so that the both end portions of the metal plate 30 are prevented from extending so as to be separated from each other. Is done. Therefore, it can prevent that the width | variety of a metal plate differs in the center part and both ends in the extending direction. When such a metal plate 30 is subjected to a bending step to form the roller body 31, the roller body 31 having a highly accurate diameter, roundness, and the like can be formed. Since the roller body 31 with high accuracy can be formed, the amount of processing such as centerless polishing described later can be reduced, and the manufacturing cost can be suppressed.

  Further, since a gap 37 is formed on the inner peripheral surface 31b side of the pair of end surfaces 34, 34, when a force such as bending or twisting is applied to the roller body 31, the pair of end surfaces 34 on the inner peripheral surface 31b side. , 34 abut against each other, it is possible to prevent a gap or a recess from being formed on the outer peripheral surface 31a side. Therefore, the pair of end surfaces 34 can be reliably brought into contact only on the outer peripheral surface 31a side.

  In addition, since the roller main body 31 (conveyance roller 13) is shape | molded using the large sized metal plate 60 with which the winding by a steel plate coil remained, the surface which was the inner peripheral side of the coil is the inner peripheral surface of the roller main body 31. It is preferable to mold so as to be. That is, the winding of the large metal plate 60 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 large metal plate 60 that forms the roller body 31 has a wrapping that warps toward the inner peripheral surface of the roller body 31.

  Therefore, winding does not act at least in the direction in which the joint 36 of the roller body 31 is opened. Therefore, it is possible to make it difficult to open the joint 36 of the roller main body 31 as compared with the case where the winding that warps to the outer peripheral surface side of the roller main body 31 remains. Thereby, even if it is a case where stress acts in the direction which opens the joint 36 of the roller main body 31, the joint 36 can be prevented from opening, and the transport roller 13 with high transport accuracy can be obtained.

Moreover, the circumferential direction (bending direction) of the roller main body 31 and the winding direction of the steel plate coil (the rolling direction of the large metal plate 60) are the same. Therefore, the bending direction of the large metal plate 60 that forms the roller body 31 can be matched with the direction of warping caused by winding. Thereby, winding of the large-sized metal plate 60 which shape | molds the roller main body 31 acts in the direction which closes the joint 36 of the roller main body 31. FIG. Accordingly, the opening of the joint 36 of the roller body 31 can be more effectively prevented.
Thus, the bending process of the metal plate 30 is completed, and the metal plate 30 is formed into a cylindrical shape.

Finally, as shown in FIG. 13, the roller body 31 and the connecting portion 63 are cut according to the cut line G. FIG. 13 is a schematic diagram illustrating a process of separating the roller body 31 from the frame portion 62.
Thus, the molding of the roller body 31 by the progressive press process (step S1) is completed.

  Next, a known centerless polishing process is performed on the outer peripheral surface of the roller body 31 formed in a substantially cylindrical shape (step S2). By this polishing process, the diameter, roundness, and warpage accuracy of the roller body 31 are adjusted to an appropriate range.

  Next, a plating process is performed on the roller body 31 (step S3). By this plating process, a plating layer 38 is formed on the inner and outer peripheral surfaces of the roller body 31, the pair of end surfaces 34, 34, and the pair of second end surfaces 35, 35. Even if a steel plate with a plating layer formed in advance, such as SECC, is used, the end surface 34 and the second end surface 35 are easily corroded because the base material of the steel plate is exposed by punching, and the end surface 34 It is necessary to form a sufficient plating layer on the second end face 35 by this process.

  Finally, the high friction layer 32 is formed in the holding region F on the outer peripheral surface 31 a of the roller body 31. First, the both ends of the roller body 31 are masked, an epoxy resin or a polyester resin is dispersed in a solvent, and this solution is applied to the outer peripheral surface of the roller body 31 to form a resin layer. Next, ceramic particles such as alumina particles are adhered to the surface of the resin layer using a powder coating method. Finally, the resin layer is cured by heat treatment, and the high friction layer 32 having ceramic particles disposed on the surface is formed.

As a method of forming the high friction layer 32, ceramic particles may be dispersed in a solvent and this solution may be applied to the surface of the resin layer instead of the powder coating method. Alternatively, the resin particles containing ceramic particles may be formed by dispersing ceramic particles in advance in a solvent together with an epoxy resin or polyester resin and applying this solution to the outer peripheral surface of the roller body 31.
With the above method, the forming of the transport roller 13 is completed.

  As described above, one or both ends of the roller body 31 (conveying roller 13) are connected to various connecting parts such as the first drive gear 23 and the third drive gear 25 shown in FIG. An engaging portion is formed for this purpose. For example, as shown in FIGS. 14 (a) and 14 (b), on opposite positions of the roller body 31 composed of cylindrical pipes (hollow pipes), that is, on two formation surfaces that define the diameter of the roller body 31. 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. 15A and 15B, a D-cut engagement portion 73 can be formed at the end of the roller body 31. The engaging portion 73 is formed at the end of a cylindrical hollow pipe (roller body 31). As shown in FIG. 15A, a part of the engaging portion 73 is cut out in a rectangular shape in plan view. 73a. 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 apparently D-shaped engaging portion 73, the connecting part is idled with respect to the roller body 31 (conveying roller 13). 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 31), the connecting part can also be connected to the roller body by using the opening 73a. It can be attached to 31 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. 16A and 16B, an engaging portion 74 having a groove 74 a and a D-cut portion 74 b can be formed at the end of the roller body 31. In the engaging portion 74, the D cut portion 74b is formed at the end of the roller body 31, and the groove 74a is formed inside the D cut portion 74b. As shown in FIG. 16 (a), the groove 74a is formed by cutting the roller body 31 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. 16B, when the pair of bent pieces 74d and 74d are bent toward the central axis side of the roller body 31, portions corresponding to the bent pieces 74d and 74d are The roller body 31 is recessed from the circular outer peripheral surface.

  Therefore, a connecting component (not shown) such as a gear is engaged with the groove 74a or the D-cut portion 74b without causing the connecting component to idle with respect to the roller body 31 (conveying roller 13). Can be attached. Moreover, in this engaging part 74, a connection component can be attached to the roller main body 31 without making it idle | rotate also by utilizing the opening 74c formed between the bending 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.

  In addition, as shown in FIGS. 17A and 17B, an engaging portion 75 having a groove 75 a and an opening 75 b can be formed at the end of the roller body 31. In the engaging portion 75, the opening 75b is formed at the outer end of the roller body 31, and the groove 75a is formed inside the opening 75b. As shown in FIG. 17 (a), the groove 75a is formed by cutting the roller body 31 approximately half in the circumferential direction. In the opening 75b, a part of the roller main body 31 is cut out in a rectangular shape in plan view outside the groove 75a, whereby 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 31. It can be attached to the (conveying roller 13) without idling. Also, in this engaging portion 75, similarly to the engaging portion 73 shown in FIGS. 15A and 15B, the connecting component is attached to the roller body 31 without being idle by using the opening 75b. be able to.

  In order to form the engagement hole 71 and the engagement portions 73, 74, and 75, the roller body 31 obtained by bending the metal plate 30 is further subjected to cutting or the like. You can also. However, in that case, the efficiency about cost and time will fall by adding a separate process process only for formation of an engaging part with respect to the roller main body 31. FIG. Therefore, in the manufacturing method of the present invention, before the roller main body 31 is formed by bending (S13), a development engagement portion to be an engagement portion is formed on the metal plate 30 by punching (S11), and thereafter When the roller body 31 is formed by bending the metal plate 30, the engaging portion is also formed at the same time.

  Specifically, when forming the long and substantially rectangular plate-shaped metal plate 30 as shown in FIG. 7 from the large metal plate 60 shown in FIG. 6, the processing from the large metal plate 60 to the small metal plate 30 is performed. At the same time, a developed engagement portion such as a notch shape, a projecting piece shape, a hole shape, or a groove shape is formed at the end of the metal plate 30 to be obtained.

  For example, as shown in FIG. 18 (a), a pair of through holes 71a, 71a are processed at predetermined positions on the end of the metal plate 30, and these are used as the deployment engaging portions 76a, whereby the metal plate 30 is bent. By processing, a pair of through-holes 71a and 71a can be made to oppose, and the engagement hole 71 shown in FIG. 14 can be formed.

  Further, as shown in FIG. 18 (b), the end of the metal plate 30 is cut into a predetermined shape to form a deployment engagement portion 73c composed of a pair of cut-out portions 73b and 73b, thereby bending the metal plate 30. The engaging portion 73 shown in FIG. 15 can be formed by processing.

  Further, as shown in FIG. 18 (c), the end of the metal plate 30 is cut out into a predetermined shape to form a deployment engaging portion 76b, and the metal plate 30 is bent and shown in FIG. The engaging portion 74 can be formed. That is, the engaging portion 74 can be formed by forming a pair of notches (recessed portions) 74e and 74e and a pair of projecting pieces 74f and 74f as the deployment engaging portion 76b. However, in this example, after the metal plate 30 is bent, 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. 18 (d), the end of the metal plate 30 is cut out into a predetermined shape to form a deployment engagement portion 76c, and the metal plate 30 is bent to obtain the shape shown in FIG. The engaging part 75 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 metal plate 30 is bent, the pair of projecting pieces 75d and 75d are also bent in an arc shape to form an opening 75b shown in FIG. 17B between the projecting pieces 75d and 75d. Can do. Therefore, it is not necessary to add further processing to the roller body 31 formed by bending, thereby sufficiently increasing the cost and time efficiency of the processing steps.

  Here, in the example shown in FIGS. 18B to 18D, metal is used so that the engaging portions 73, 74, and 75 shown in FIGS. 15, 16, and 17 are formed across the joint 36. Deployment engaging portions 73 c, 76 b, 76 c are formed at both ends of the plate 30. Thus, the joint 36 of the roller main body 31 to form can be made shorter than the length of this roller main body 31 by forming the expansion | deployment engaging parts 73c, 76b, and 76c in both ends. Therefore, it is possible to suppress deformation of the roller body 31 due to the end surfaces 34 and 35 partially contacting and interfering when the joint 36 is formed.

However, the present invention is not limited to this, and as shown in FIGS. 19A to 19C, the width direction (bending direction) is not formed on the both ends of the metal plate 30 as shown in FIG. ) In the vicinity of the center line. That is, as shown in FIG. 19A, the engaging portion 73 shown in FIG. 15 can be formed by forming a deployment engaging portion 76d made of an elongated rectangular cutout at the end. Further, by forming the deployment engaging portion 76e formed of a T-shaped notch as shown in FIG. 19B, the engaging portion 74 shown in FIG. 16 can be formed, and further, FIG. By forming the development engagement portion 76f formed of a substantially T-shaped notch as shown in c), the engagement portion 75 shown in FIG. 17 can be formed.
Thus, if the expansion | extension engagement parts 76d-76f are formed in the vicinity of the centerline in a bending direction, the engagement parts 73-75 obtained from these expansion | extension engagement parts 76d-76f can be formed more accurately. .

As described above, in the method of manufacturing the transport roller 13 according to the present embodiment, when the small metal plate 30 is formed from the large metal plate 60 by punching, the unfolding engagement portion is also formed at the same time. Since the engaging portions 71, 73, 74, and 75 are formed from the deployment engaging portion when bending the roller body 31, after forming the roller body 31, a separate processing step is performed only for forming the engaging portion. No need to add.
Therefore, since the cost and time required for the added processing steps are not required, the cost of the transport roller 13 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.

  Further, as shown in FIG. 13, in the transport roller 13 (roller body 31) according to the present embodiment, the joint 36 is formed to be parallel to the central axis of the roller body 31 formed of a cylindrical hollow pipe. However, the present invention is not limited to this, for example, a joint formed between a pair of end portions of the metal plate 30 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 at one or a plurality of points without overlapping with the line segment.

Specifically, as shown in FIG. 20A, the outer peripheral surface of the roller body 31 is arranged in the circumferential direction so as to intersect with the joint 81 without being parallel to the central axis C ₁ of the roller body 31. The roller main body 31 may be formed so as to extend from one end to the other end. In order to form the joint 81 in this way, the metal plate serving as the base material is not the elongated rectangular metal plate 30 as shown in FIG. 7, but an elongated parallelogram as shown in FIG. 20B. using a metal plate 30A, a straight line is bent so that the central axis machining indicated at C _2. Thus, to obtain the roller body 31 shown in FIG. 20 (a), the joint 81 is not parallel to the center axis C _1.

  In addition, in the roller main body 31 shown to Fig.20 (a), the joint 81 is formed so that it may rotate only less than one round from the one end of the roller main body 31 to the other end. This is to facilitate bending of the metal plate 30A. However, as shown in FIG. 20 (c), the joint 82 may be formed so as to rotate one or more times around the peripheral surface from one end to the other end of the roller body 31, that is, spirally. In that case, the angle γ in the elongated parallelogram-shaped metal plate 30A shown in FIG.

In addition, as shown in FIG. 21A, the joint 83 may be formed in a wavy line formed of a curve such as a sine wave. In order to form the joint 83 in this way, as a metal plate serving as a base material, as shown in FIG. 21 (b), a metal plate having an elongated and substantially rectangular shape and both long sides thereof being formed in a wavy shape with 30B, the straight line is bending processed to a central axis indicated at C _2. In addition, since a pair of long sides formed in a wavy shape are brought close to each other by bending, of course, when one long side becomes a peak portion between corresponding portions, 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 31, but the center line of the joint 83 is also not parallel to the center axis of the roller body 31. You may form in. In that case, as a metal plate to be a base material, a long and parallelogram-shaped metal plate as shown in FIG. 20 (b) and both of which long sides are formed in a wavy shape may be used. .

Further, as shown in FIG. 22A, the joint 84 may be formed in a wavy shape bent in a hook shape. In order to form the joint 84 in this way, as a metal plate as a base material, as shown in FIG. 20 (b), it is a long and narrow rectangular shape, and both long sides thereof are bent in a wavy shape. using the formed metal plate 30C, a straight line is bending processed to a central axis indicated at C _2.
Also in this metal plate 30C, between the portions corresponding to each other in a 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. In this example, the center line of the joint 84 is formed so as to be parallel to the center axis of the roller body 31. However, as in the case of the joint 83, the center line is not parallel to the center axis of the roller body 31. You may form in.

  Moreover, about a joint, it is not limited to the example shown in FIGS. 20-22, A various shape is employable. For example, the wavy line composed of the curve shown in FIG. 21 (a) may be combined with the bent wavy line shown in FIG. 22 (a), and these may be combined with an oblique line as shown in FIG. Also good.

  If the joints 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 31), The transport roller 13 having the roller body 31 has a constant transport speed of the recording paper P when the recording paper P is transported in cooperation with the driven roller 14, that is, when the paper is fed. Is more reliably prevented.

That is, portions in contact with the recording paper P during paper feeding conveyance roller 13 as shown in FIG. 23 is basically a straight line L on the outer peripheral surface, that is, the center axis C ₁ parallel to a straight line L. Therefore, as shown in FIG. 13, when the joint 36 of the transport roller 13 (roller body 31) is parallel to the central axis of the roller body 31, the entire transport joint 13 is temporarily (instantaneous). ) In contact with the recording paper P. Then, since the groove is not formed due to the joint 36 as described above in the transport roller 13 of the present embodiment, there is no problem, but the groove is temporarily formed due to the joint 36. This groove temporarily and simultaneously contacts the recording paper P, and therefore the entire width of the recording paper P temporarily contacts the groove caused by the joint 36. As a result, the groove has a dent compared to the other outer peripheral surface of the transport roller 13, and the contact resistance with respect to the recording paper P is small. Therefore, the transport speed of the recording paper P is temporarily reduced, resulting in uneven transport. Will occur.

  However, if the joints 81 to 84 are formed as shown in FIGS. 20A, 20C, 21A, and 22A, grooves are formed due to these joints. Even if there is only one or a plurality of points where the groove contacts the recording paper P at the same time during paper feeding. Accordingly, there is almost no change in the contact resistance as compared with the case where the other surface (line) of the transport roller 13 hits, whereby the transport speed of the recording paper P becomes constant, and transport unevenness is prevented.

  Moreover, about the joint of the conveyance roller 13 (roller main body 31) which consists of a cylindrical hollow pipe other than the example mentioned above, for example, as shown to Fig.24 (a), it is parallel to the center axis | shaft of the roller main body 31. It may be formed having a rectangular wave-like bent portion 85 composed of a straight portion 85a and a straight portion 85b orthogonal thereto. Even in a joint having such a bent portion 85, if a groove is temporarily formed due to the joint, the groove is formed over the entire width of the recording paper P during paper feeding. Since there is no contact at the same time, the conveyance speed of the recording paper P becomes substantially constant, and uneven conveyance is prevented.

Further, the bent portion 85 may be formed over the entire length of the roller body 31 as shown in FIG. 24 (b), and the central portion thereof as shown in FIG. 24 (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. 24C, a space between the bent portions 85 becomes a central straight portion 86 parallel to the central axis of the roller body 31. However, although not shown, a central straight portion between the bent portion 85 may be formed on the oblique line of the center axis C ₁ and not parallel as shown in FIG. 20 (a).
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 32 shown in FIG. It is preferable to do so.

  When the bent portion 85 is formed at the joint, and thus the bent portion 85 is made to be a fitting portion with unevenness, the bent portion 85 (fitting portion) is fitted as designed, and the tip of the convex portion and the tip It becomes difficult to make it approach (match) without a gap between the recesses corresponding to. Therefore, when the bent portion 85 is formed over the entire length of the roller body 31, the roller body 31 is likely to be distorted or twisted. Therefore, if the bent portions 85 are formed only at both ends as shown in FIG. 24C, 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 32 that is an area directly in contact with the recording paper P as the central straight portion 86 instead of the bent portion 85, the area directly in contact with the recording paper P is distorted. It is possible to reliably prevent twisting and the like from occurring.

  In addition, about the joint of the conveyance roller 13 (roller main body 31) which consists of a cylindrical hollow pipe, in addition to the above-mentioned example, for example, as shown in FIG. The angle ε 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 roller body 31. In this way, when the pair of end surfaces are brought close to each other in the bending process 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 31 is distorted or twisted. Can be suppressed.

Further, in the structure in which the bent portion 85 is formed only at both ends as shown in FIG. 24C, the bent portion 85 is shown in FIG. 21A as shown in FIG. 25B, for example. The wavy line 89a may be replaced with a curved line 89a, and may be replaced with the bent wavy line 89b shown in FIG. 22 (a) as shown in FIG. 25 (c).
Further, the rectangular wave-like bent portion 85 shown in FIG. 24A and the wavy line 89a made of the curve shown in FIG. The joint 85 may be formed by combining the portion 85 and the bent wavy line 89b shown in FIG.

  Moreover, as shown in FIG. 26, the convex part 39 may be provided in one side of a pair of end surfaces 34 and 34, and the recessed part 40 which can fit the convex part 39 may be provided in the other side. The convex portion 39 and the concave portion 40 are displaced in the extending direction of the pair of end surfaces 34 and 34 when the convex portion 39 is fitted into the concave portion 40 and a torsional force is applied to the roller body 31. It is for preventing. The tip portion 39a of the convex portion 39 and the bottom portion 40a of the concave portion 40 are parallel to each other. In addition, it is preferable that the convex part 39 and the recessed part 40 are provided other than the support area | region of the bearing (not shown) other than the holding | maintenance area | region F of the conveyance roller 13, and the conveyance roller 13. As shown in FIG.

  In the state where the roller body 31 is molded, the convex portion 39 is fitted in the concave portion 40 without a gap, but a predetermined gap is provided between the tip portion 39a of the convex portion 39 and the bottom portion 40a of the concave portion 40. 41 is formed. The gap 41 is provided in order to bring the pair of end surfaces 34 and 34 into uniform contact with each other.

Moreover, in the conveyance roller 13, you may provide the opening 90 in a part of joint 36 formed in the roller main body 31, as shown to Fig.27 (a).
Since the joint 36 is formed over the entire length of the roller body 31, when the grease supplied to the bearing (not shown) that rotatably supports the transport roller 13 adheres to the surface of the transport roller 13, the grease is joined. 36 is transmitted by capillary action. Particularly, in order to improve the strength of the transport roller 13, the smaller the gap between the pair of end surfaces 34, 34 in the joint 36, the stronger the capillary phenomenon of the grease, and the easier it is for the grease to flow along the joint 36. .

  Therefore, as shown in FIG. 27B, an opening 90 is provided in a part of the joint 36 formed in the roller body 31. The opening 90 is formed by notches 91 and 92 provided in a pair of end surfaces 34 and 34 that form the joint 36. When the pair of end surfaces 34, 34 are brought into contact with each other, the maximum distance d between the notches 91, 92 is set to be, for example, about 1 mm or more, and functions as the opening 90.

  The opening 90 is provided in a region excluding the region where the high friction layer 32 is formed and the region supported by the bearing among the joints 36 formed over the entire length of the transport roller 13 (roller body 31). That is, the high friction layer 32 is formed in the substantially center part of the conveyance roller 13, and the both ends of the conveyance roller 13 are supported by the bearing, so the conveyance roller 13 is provided with at least two openings 90.

  The opening 90 is provided for the purpose of preventing the grease (lubricant) supplied (applied) to the bearing from reaching the high friction layer 32 along the joint 36 (the gap between the pair of end surfaces 34 and 34). That is, by providing the opening 90 in a part of the joint 36, the capillary action of grease is stopped. Specifically, by providing an opening 90 between the region supported by the bearing and the region where the high friction layer 32 is formed in the joint 36, the grease is prevented from reaching the high friction layer 32. Yes. Then, by adjusting the size of the opening 90 (the maximum distance d between the pair of cutout portions 91 and 92), the capillary action of grease can be reliably stopped.

  Note that the present invention is not limited to the case where the notches 91 and 92 for forming the opening 90 are formed in each of the pair of end surfaces 34 and 34 forming the joint 36. That is, as shown in FIG. 27C, a notch 93 is formed only on one of a pair of end surfaces 34, 34 forming the joint 36, and an opening 90 is formed by the notch 93 and the other end surface 34. It may be formed. Further, the shape of the opening 90 is not limited to a rectangle, and may be a circle or the like.

Next, the operation of the printer 1 according to this embodiment will be described with reference to FIGS. 1 to 3.
As shown in FIGS. 1 and 2, the recording paper P placed on the paper feed tray 11 is supplied toward the transport unit 3 by the rotation of the paper feed roller 12 in the paper feed unit 2. The transport roller 13 is rotated by the operation of the driving unit 6. The driven roller 14 provided in contact with the outer peripheral surface of the transport roller 13 rotates in a direction opposite to the transport roller 13. The recording paper P supplied from the paper supply unit 2 is sandwiched between the transport roller 13 and the driven roller 14, and the high friction layer 32 is formed in the holding region F of the transport roller 13, so that recording is performed. The paper P is held by the transport roller 13. Therefore, the recording paper P is accurately transported with the rotation of the transport roller 13.

  Here, as shown in FIG. 3, the pair of end surfaces 34, 34 are in contact with each other on the outer peripheral surface 31 a side, and there are no gaps, recesses, or the like that open to the outer peripheral surface 31 a side at the joint 36. Therefore, even if the transport roller 13 rotates, the outer peripheral surface 31a can always be in contact with the recording paper P. Therefore, no slip or the like occurs between the outer peripheral surface 31a and the recording paper P, and the recording paper P can be conveyed with high accuracy.

The recording paper P is transported onto the top surface of the diamond rib 16 in the platen 15 by the rotation of the transport roller 13. On the recording paper P placed on the diamond rib 16, ink is ejected from the ejection head 19 which has moved to an appropriate position together with the carriage 20, and information such as characters and images is printed. After this printing, the recording paper P is discharged by the rotation of the paper discharge roller 17 and the paper discharge jagged roller 18 of the paper discharge unit 4.
Thus, the operation of the printer 1 according to this embodiment is completed.

Therefore, according to the present embodiment, the following effects can be obtained.
According to this embodiment, even if the end face 34 is adjusted on the metal plate 30 before being formed into a cylindrical shape, the effect that the roller body 31 having a highly accurate diameter, roundness, and the like can be formed. is there.

[Second Embodiment]
A method of forming the third transport roller (transport roller) 13B according to this embodiment will be described with reference to FIGS.
FIG. 28 is a schematic diagram illustrating the configuration of the third transport roller 13B in the present embodiment, in which (a) is a side view, (b) is a cross-sectional view taken along line II of (a), and (c) is illustrated. It is edge part sectional drawing of (a). FIG. 29 is a flowchart showing a process of forming the third transport roller 13B, in which (a) is an overall flowchart, and (b) is a detailed flowchart of progressive press work in (a). 30A and 30B are schematic views showing the arrangement of the metal plate 30 in the second end face adjustment processing, where FIG. 30A is a cross-sectional view in the extending direction, and FIG. 30B is a plan view of the second adjustment female die 130. is there. FIGS. 31A and 31B are schematic views showing the second end face adjusting process, where FIG. 31A is a cross-sectional view in the extending direction at the time of adjustment, and FIG. 31B is an enlarged view of the second end face 45 in the vicinity of FIG. FIG.
28 to 31, the same components as those of the first embodiment shown in FIGS. 3, 5, 9, and 10 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 28, the third transport roller 13 </ b> B has a third roller body 31 </ b> B and a high friction layer 32. The third roller body 31B is a shaft member formed by bending a metal plate having a substantially constant thickness into a cylindrical shape, and has a joint 36 where a pair of end faces 34, 34 of the metal plate are in contact with each other.

  A pair of second end faces 45, 45 are provided at both ends of the third roller body 31B in the axial direction. Since the second end surface 45 is an end surface of the cylindrical third roller body 31B, it is formed in an annular shape. The second end surface 45 includes a second end surface inner edge portion 45a which is a surface on the inner peripheral surface 31b side, and a second end surface outer edge portion 45b which is a surface on the outer peripheral surface 31a side. Both the second end surface inner edge portion 45a and the second end surface outer edge portion 45b are formed in an annular shape. The first angle α1 formed by the second end surface inner edge 45a and the inner peripheral surface 31b and the second angle α2 formed by the second end surface outer edge 45b and the outer peripheral surface 31a are both greater than 90 °. ing.

  The second end surface outer edge portion 45b is a chamfered portion at the end portion of the third roller body 31B. Therefore, when connecting components such as gears are attached from the end side of the third roller body 31B, the attachment can be easily performed. Further, it is possible to prevent injuries and the like that occur at the end of the third roller body 31B.

  As shown in FIG. 29 (a), the outline of the molding process of the third roller main body 31B is first to form the cylindrical third roller main body 31B by progressive press processing from a large metal plate as a material (step). S1).

  As shown in FIG. 29 (b), details of the progressive press processing in step S1 are punching (step S11) for forming the metal plate 30, a pair of end surfaces 34, 34 and a pair of second plates of the metal plate 30. End surface adjustment processing (step S12) for adjusting the end surfaces 45, 45, second end surface adjustment processing (step S13) for adjusting the pair of second end surfaces 45, 45, and the third roller by bending the metal plate 30 into a cylindrical shape The bending process (step S14) for forming the main body 31B is sequentially performed. In addition, since it is the same as that of 1st Embodiment from step S2 to step S4, the description is abbreviate | omitted and hereafter, the 2nd end surface adjustment process in step S1 is demonstrated in detail.

  The 2nd end surface adjustment process in this embodiment is demonstrated with reference to FIG.30 and FIG.31. Note that the end surface adjustment processing (step S12) has been completed before the second end surface adjustment processing, and the adjustment of the pair of end surfaces 34, 34 and the pair of second end surfaces 45, 45 of the metal plate 30 has been completed. And

  As shown in FIG. 30, the metal plate 30 is disposed between the second adjustment female mold 130 and the second adjustment male mold 140 used for the second end face adjustment processing. Here, the metal plate 30 is arranged so that the outer peripheral surface 31 a side faces the second adjustment female die 130. Since the second end face 45 has been adjusted by the end face adjusting process (step S12), the first angle α1 (not shown in FIG. 9) formed by the second end face 45 and the inner peripheral face 31b is larger than 90 °. It has become. The second end face 45 is provided facing the second adjustment male mold 140 side.

  The second adjustment female mold 130 is formed with a second recess 131 in which the metal plate 30 is disposed. The second recess 131 is formed to extend in the width direction of the metal plate 30, is formed to face the second adjustment male mold 140, and includes a bottom surface 132 and a pair of inner side surfaces 134 and 134. . The bottom surface 132 is a surface with which the plate surface in the thickness direction of the metal plate 30 abuts, and is formed in a planar shape facing the second adjustment male mold 140.

  The pair of inner side surfaces 134, 134 are planar side surfaces for adjusting the pair of second end surfaces 45, 45 of the metal plate 30, and both are parallel to the width direction of the metal plate 30 and in one direction. It is formed to extend. The pair of inner side surfaces 134 and 134 extend in parallel to each other. The pair of inner side surfaces 134, 134 are inclined so as to be gradually separated from the bottom surface 132 toward the second adjustment male mold 140. That is, the width between the pair of inner side surfaces 134, 134 gradually increases from the bottom surface 132 toward the second adjustment male mold 140. Each of the pair of inner side surfaces 134 and 134 has an opening (not shown) through which the connecting portion 63 passes.

  The second adjustment male die 140 is provided with a convex portion 141 protruding toward the second adjustment female die 130 side. The top surface of the convex portion 141 on the second adjustment female mold 130 side is formed in a planar shape parallel to the bottom surface 132. The protruding height of the convex portion 141 is set to a size that can be adjusted by pressing the metal plate 30 disposed in the second concave portion 131.

  As shown in FIG. 31, the second adjustment female die 130 and the second adjustment male die 140 are brought into contact with each other, and the metal plate 30 is pressed. Here, the second end surface 45 of the metal plate 30 is pressed by the pair of inner side surfaces 134, 134 from the opposite side of the direction adjusted by the end surface adjustment process (step S12), that is, from the outer peripheral surface 31a side. By this pressing, a second end surface outer edge portion 45b connected to the outer peripheral surface 31a is formed on the second end surface 45. The second angle α2 formed by the second end surface outer edge portion 45b and the outer peripheral surface 31a is larger than 90 °.

  Note that the second end surface 45 is not completely adjusted by the inner side surface 134, and a portion adjusted by the inner side surface 114 of the adjustment female mold 110 in the end surface adjustment processing remains on the second end surface 45. Since the portion that has not been adjusted is the second end surface inner edge portion 45a, the second end surface 45 is formed with a second end surface outer edge portion 45b and a second end surface inner edge portion 45a. The first angle α1 formed by the second end surface inner edge 45a and the inner peripheral surface 31b is greater than 90 °.

  In this embodiment, while adjusting the 2nd end surface 45 from the inner peripheral surface 31b side, the 2nd end surface adjustment process which adjusts the 2nd end surface 45 from the outer peripheral surface 31a side is performed. Therefore, the stress remaining in the metal plate 30 by adjusting from one side can be offset by adjusting from the opposite side. Therefore, distortion, deformation, etc. when the third roller body 31B is molded are reduced. Moreover, since the 2nd end surface 45 becomes an edge part in the axial direction after the shaping | molding of the 3rd roller main body 31B, by adjusting the 2nd end surface 45 from the outer peripheral surface 31a side, in the edge part of the 3rd roller main body 31B A chamfer is formed. Therefore, when connecting components such as gears are attached from the end side of the third roller body 31B, the attachment can be easily performed. Further, it is possible to prevent injuries and the like that occur at the end of the third roller body 31B.

Therefore, according to the present embodiment, the following effects can be obtained.
According to the present embodiment, in addition to the effects obtained by the first embodiment, stress inside the metal plate 30 due to processing can be canceled and reduced, and a chamfered portion at the end of the third roller body 31B can be formed. There is an effect.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the second embodiment, the second end face adjustment process is performed on both of the pair of second end faces 45, but the present invention is not limited to this, and the second end face is provided only on one second end face 45. Adjustment processing may be performed.

DESCRIPTION OF SYMBOLS 1 ... Printer (printing apparatus), 3 ... Conveying part (conveying unit), 13 ... Conveying roller, 13A ... Second conveying roller (conveying roller), 13B ... Third conveying roller (conveying roller), 30 ... Metal plate, 31a ... outer peripheral surface (other plate surface), 31b ... inner peripheral surface (one plate surface), 34 ... end surface, 34a ... one end surface (one end surface), 34b ... other end surface (the other end surface), 35 ... second end surface, 37 ... Gap, 37A ... Second gap (gap), 45 ... Second end surface, P ... Recording paper (recording medium)

Claims (9)

A manufacturing method of a conveyance roller formed in a cylindrical shape with a pair of end faces of a metal plate facing each other,
The angle formed by at least one of the pair of end surfaces of the metal plate and one plate surface in the plate thickness direction of the metal plate is adjusted to be greater than 90 °, and the extending direction of the end surface An adjustment step of adjusting the angle formed by the one plate surface side of the pair of second end surfaces in the metal plate and the one plate surface to be larger than 90 °,
A bending step of bending the metal plate so that the other plate surface opposite to the one plate surface is an outer peripheral surface, and abutting at least the outer peripheral surface sides of the pair of end surfaces to form a cylindrical shape; The manufacturing method of the conveyance roller characterized by having. In the manufacturing method of the conveyance roller of Claim 1,
Prior to the bending step, an angle formed by the other plate surface side of at least one second end surface of the pair of second end surfaces and the other plate surface is adjusted to be larger than 90 °. It has a 2nd adjustment process, The manufacturing method of the conveyance roller characterized by the above-mentioned. In the manufacturing method of the conveyance roller of Claim 1 or 2,
In the adjusting step, both of the pair of end faces are adjusted. In the manufacturing method of the conveyance roller of Claim 1 or 2,
In the adjusting step, only the one end surface is adjusted. In the manufacturing method of the conveyance roller as described in any one of Claim 1 to 4,
In the bending step, the inner peripheral surface side of the pair of end surfaces has a gap. A printing apparatus provided with a conveyance roller for conveying a recording medium, which is formed in a cylindrical shape with a pair of end faces of a metal plate facing each other,
The pair of end surfaces are in contact with each other on the outer peripheral surface side, and have a gap on the inner peripheral surface side,
The printing apparatus, wherein an angle formed between the inner peripheral surface side of the pair of second end surfaces at both ends in the axial direction of the transport roller and the inner peripheral surface is larger than 90 °. The printing apparatus according to claim 6.
An angle formed between the outer peripheral surface of at least one second end surface of the pair of second end surfaces and the outer peripheral surface is greater than 90 °. A transport unit including a transport roller formed in a cylindrical shape with a pair of end faces of a metal plate facing each other,
The pair of end surfaces are in contact with each other on the outer peripheral surface side, and have a gap on the inner peripheral surface side,
The transport unit characterized in that an angle formed between the inner peripheral surface side of the pair of second end surfaces at both ends in the axial direction of the transport roller and the inner peripheral surface is larger than 90 °. A transport roller formed into a cylindrical shape with a pair of end faces of a metal plate facing each other,
The pair of end surfaces are in contact with each other on the outer peripheral surface side, and have a gap on the inner peripheral surface side,
A transport roller, wherein an angle formed between the inner peripheral surface side of the pair of second end surfaces at both ends in the axial direction and the inner peripheral surface is larger than 90 °.

Images