JP5928105B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus.

Conventionally, various printers are provided as recording apparatuses. In such a printer, a recording medium such as paper is conveyed to a recording unit by a conveyance roller and a driven roller, and after recording by the recording unit, the recording medium is discharged by a paper discharge roller and the driven roller. .
For example, in an ink jet printer as a recording apparatus, a conveyance roller is driven to rotate in a state in which a sheet is sandwiched between driven rollers, thereby moving the sheet in a direction that intersects the direction in which the carriage moves. .

  For the purpose of cost reduction, a conveying roller is disclosed in which a metal plate is bent to form a hollow cylindrical roller body, and a friction layer is formed on the outer periphery of the roller body for the paper to come into contact (for example, Patent Document 1). In such a roller main body 100 in FIG. 15A, the joint 101 formed by facing the end faces 100a and 100b of the metal plate by bending is prevented from separating in the circumferential direction D10, and For the purpose of preventing the end faces 100a, 100b of the metal plate from shifting in the axial direction D11 of the rotation center X of the roller body 100, a protruding portion 102 is formed on one end face side, and a recess 103 is formed on the other end face side. The fitting part which formed and fitted the protrusion part 102 and the recessed part 103 is provided.

FIG. 15B is a cross-sectional view seen from the axial direction D11 at the position of the broken line M in FIG. In the fitting portion in which the protruding portion 102 and the concave portion 103 are fitted, a protruding portion 105 that protrudes outward from the extension line N that extends the outer periphery 104 in a circular shape may be formed. When the protrusion 105 is formed in the fitting portion, the friction layer formed by coating resin or the like on the outer periphery of the roller body 100 protrudes to the outer peripheral side at the portion of the protrusion 105. For this reason, the conveyance speed when the sheet is conveyed while being in contact with the friction layer changes, resulting in uneven conveyance.
Therefore, in order not to form the friction layer at the position of the fitting portion, the fitting portion is provided at a position overlapping with the bearing portion that holds the main body roller 100 in the axial direction D11.

JP 2010-184806 A

  However, when the fitting portion is provided at a position overlapping with the bearing portion that holds the roller body 100, there is a problem that the sliding surface of the bearing portion is damaged by the protrusion 105 as the roller body 100 rotates.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1] A joint having a pair of end portions facing each other, a conveyance roller that conveys a recording medium, and a sliding portion that slides on the outer peripheral surface of the conveyance roller, A bearing portion that rotatably holds the transport roller, and the transport roller includes a protruding portion formed on one end side of the pair of end portions, and the pair of end portions. And a recess formed on the other end side, and the fitting portion is arranged at a position overlapping the bearing portion in the axial direction of the transport roller, The sliding portion is formed with a groove portion having a width longer than the length of the protruding portion in the axial direction at a location corresponding to the protruding portion, and the depth of the groove portion of the sliding portion of the bearing portion. The protrusion protrudes from the outer peripheral surface of the transport roller Was formed deeper than the length, the recording apparatus characterized by.

According to this application example, the sliding portion of the bearing portion is formed with a groove having a width longer than the length of the protruding portion in the axial direction at a location corresponding to the protruding portion. Thereby, since a protrusion part is located inside a groove part, it can suppress that the sliding part of a bearing part is damaged with rotation of a conveyance roller.
Furthermore, since the protruding portion is located inside the groove portion, the protruding portion does not slide with the sliding portion. Thereby, it can suppress that the sliding part of a bearing part is damaged with rotation of a conveyance roller.

1 is a side sectional view of an ink jet printer according to the present invention. (A) is a top view of a conveyance unit part, (b) is a side view of a drive system. The schematic block diagram of a conveyance roller mechanism. (A), (b) is a top view which shows the metal plate as a base material of a roller main body. (A)-(c) is process drawing for demonstrating the press work of a metal plate. (A)-(c) is process drawing for demonstrating the press work of a metal plate. The perspective view of the part of the fitting part formed in the roller main body. (A) is the figure which looked at the conveyance roller with which the bearing part was equipped from the axial direction of the rotation center, (b) was the figure which expanded the part of the fitting part which slides a to-be-slided surface. (A) is the figure which looked at the roller main body in Embodiment 2 from the axial direction of the rotation center, (b) is a figure which shows the roller main body pressed using an upper mold | type and a lower mold | type. (A) is a figure which shows a recessed part, (b) is a perspective view of a split type, (c) is a perspective view of a core type. (A) is the figure which looked at the split type from the direction orthogonal to the axial direction, (b) is the figure which looked at the split type from the axial direction. The perspective view of the bearing part in Embodiment 3. FIG. (A) is a view of a roller body in which trapezoidal protrusions and recesses are formed, (b) is a view of a roller body in which triangle-shaped protrusions and recesses are formed, and (c) is a semicircular shape. The figure of the roller main body in which the protrusion part and recessed part of this were formed. (A) is the figure which looked at the conveyance roller with which the bearing part in the comparative example was equipped from the axial direction of the rotation center, (b) expanded the part of the fitting part which slides the sliding surface in a comparative example. Figure. (A) is the perspective view of the conventional roller main body, (b) is the figure which looked at the conventional roller main body from the axial direction of the rotation center.

(Embodiment 1)
Hereinafter, the present invention will be described in detail with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size. With reference to FIG. 1 and FIG. 2, the recording apparatus provided with the conveyance roller of this invention is demonstrated. 1 is a side sectional view of a recording apparatus (inkjet printer) provided with a transport unit according to the present invention, FIG. 2A is a plan view of a transport unit portion of the recording apparatus, and FIG. It is a side view of the drive system of an apparatus.

  In FIG. 1, reference numeral 1 denotes an ink jet printer as an embodiment of the recording apparatus of the present invention. The ink jet printer 1 includes a printer main body 3, a paper feeding unit 5 provided on the upper rear side of the printer main body 3, and a paper discharge unit 7 formed on the front side of the printer main body 3. It is.

  A paper feed tray 11 is provided in the paper feed unit 5, and a plurality of sheets (recording media) P are stacked on the paper feed tray 11. Here, as the paper P, plain paper, coated paper, OHP (overhead projector) sheet, glossy paper, glossy film, or the like is used. A paper feed roller 13 is provided on the downstream side of the paper feed tray 11. The paper feed roller 13 is configured to sandwich the paper P located at the uppermost part of the paper feed tray 11 with an opposing separation pad (not shown) and send it forward.

  The fed paper P reaches a conveyance roller mechanism 19 including a conveyance roller 15 disposed on the lower side and a driven roller 17 disposed on the upper side. The conveyance roller 15 becomes one Embodiment of the conveyance roller of this invention so that it may mention later. Further, an embodiment of the transport unit of the present invention is configured by the transport roller 15, the driven roller 17, and a drive device that further rotates the transport roller 15.

  The paper P that has reached the transport roller mechanism 19 is opposed to the print head 21 on the downstream side of the transport roller mechanism 19 while receiving a precise and accurate transport (paper feed) operation associated with the recording process by the rotational drive of the transport roller 15. It is transported to the position.

  The print head 21 is held by a carriage 23, and the carriage 23 is configured to reciprocate in a direction orthogonal to the paper feed direction (paper P transport direction). A platen 24 is disposed at a position facing the print head 21, and the platen 24 is constituted by a plurality of diamond ribs 25 arranged at intervals along the moving direction of the carriage 23.

  The diamond rib 25 supports the paper P from below when recording on the paper P by the print head 21. Specifically, the top surface of the diamond rib 25 functions as a support surface. . The printing process (recording process) by the print head 21 is controlled by the control unit CONT.

  The distance between the print head 21 and the diamond rib 25 can be adjusted according to the thickness of the paper P, so that the paper P can pass through the top surface of the diamond rib 25 and be high quality. It is to be recorded. The paper P recorded by the print head 21 is sequentially discharged by a paper discharge roller mechanism 27 provided in the paper discharge unit 7.

  The paper discharge roller mechanism 27 includes a paper discharge roller 29 disposed on the lower side and a paper discharge jagged roller 31 disposed on the upper side. It comes to discharge.

  Here, the relationship between the drive system of the transport roller 15 and the paper discharge roller 29 and the drive speed of both the rollers 15 and 29 in the transport roller mechanism 19 and the paper discharge roller mechanism 27 will be described. As shown in FIGS. 2A and 2B, the printer body 3 is provided with a transport motor (drive device) 32 that is driven under the control of the control unit CONT.

  The drive shaft of the transport motor 32 is provided with a pinion 33, and the transport drive gear 35 is engaged with the pinion 33, and the transport roller 15 is inserted and connected to the transport drive gear 35. . Under such a configuration, the transport motor 32 is a driving device that rotationally drives the transport roller 15.

  The transport roller 15 is provided with an inner gear 39 coaxially with the transport drive gear 35, and an intermediate gear 41 is engaged with the inner gear 39. The intermediate gear 41 has a paper discharge drive gear 43. Are in mesh. As shown in FIG. 2A, the rotation shaft of the paper discharge drive gear 43 is a shaft body 45 of the paper discharge roller 29 in FIG. Under such a configuration, the transport roller 15 of the transport roller mechanism 19 and the paper discharge roller 29 of the paper discharge roller mechanism 27 are driven by receiving the rotational driving force from the transport motor 32 that is the same drive source. It has become so.

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

  Further, the holding force (pressing force) of the paper P by the transport roller mechanism 19 is set larger than the holding force (pressing force) by the paper discharge roller mechanism 27. Therefore, when the transport roller mechanism 19 and the paper discharge roller mechanism 27 both hold the paper P, the paper transport speed is independent of the paper discharge speed of the paper discharge roller mechanism 27 and is transported by the transport roller mechanism 19. It is specified by speed.

  Next, the conveyance roller mechanism 19 provided with the conveyance roller 15 according to the present invention will be described. FIG. 3 is a diagram illustrating a schematic configuration of the transport roller mechanism 19 including the transport roller 15 and the driven roller 17. The transport roller 15 includes a roller main body 16 formed into a cylindrical shape by pressing a metal plate such as a galvanized steel plate or a stainless steel plate, and a high friction layer 50 provided on the surface of the roller main body 16. Is.

  Further, both ends of the transport roller 15 are rotatably held by the bearing unit 70. In particular, the end of the transport roller 15 on the side connected to the inner gear 39 or the transport drive gear 35 is engaged to rotate and connect to the inner gear 39 or the transport drive gear 35. A portion (not shown) is formed.

  Further, the high friction layer 50 is formed in a recording region range R in which the print head 21 reciprocates and records characters and images on the paper P in the axial direction D1 of the rotation center X of the roller body 16.

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

  Therefore, the driven roller 17 comes into contact with the high friction layer 50 of the transport roller 15 with a predetermined pressing force (clamping force with respect to the paper P), and rotates following the rotation operation of the transport roller 15. Moreover, the force which clamps the paper P between the conveyance roller 15 and the driven roller 17 becomes large, and the conveyance property of the paper P becomes more favorable. Note that the surface of each roller 17a of the driven roller 17 is subjected to a low wear treatment such as a fluororesin coating in order to alleviate damage due to sliding contact with the high friction layer 50.

  The roller body 16 is formed in a cylindrical shape by pressing a metal plate and bringing a pair of opposed end faces close to each other. Therefore, the pair of end surfaces of the roller body 16 are slightly separated from each other, and a joint is formed between the end surfaces.

  Here, the manufacturing method of the conveyance roller 15 is demonstrated. 4A and 4B are plan views showing a metal plate as a base material of the roller body. In order to manufacture the transport roller 15, first, as shown in FIG. 4A, a rectangular or strip-shaped large metal plate (first metal plate) 65 is prepared. As the large metal plate 65, for example, a galvanized steel plate having a thickness of about 1 mm is used. Subsequently, by pressing the large metal plate 65, as shown in FIG. 4B, an elongated rectangular plate-shaped metal plate (second metal plate) 60 having a size corresponding to the roller main body 16, that is, a roller. A metal plate 60 to be a base material of the main body 16 is formed.

  Protruding portions 80 are formed at both end portions of the end surface 61 a which is one long side of the metal plate 60. Moreover, the recessed part 81 is formed in the both ends in the end surface 61b used as the other long side of the metal plate 60. As shown in FIG.

  Next, the metal plate 60 is pressed into a cylindrical shape (pipe shape) as shown in the pressing process diagrams of FIGS. 5 (a) to 5 (c) and FIGS. 6 (a) to 6 (c). Side) end faces 61a and 61b are brought close to each other. That is, first, the metal plate 60 is pressed by the male mold 101 and the female mold 102 shown in FIG. 5A, and both side portions 62a and 62b of the metal plate 60 are formed in an arc shape (preferably approximately 1/4 arc). Bend. In FIG. 5A, in order to make each member easy to understand, these members are shown with a space between the metal plate 60, the male mold 101, and the female mold 102. In reality, it does not exist, and the metal plate 60 and the male mold 101 and the female mold 102 are in close contact with each other at their contact portions. The same applies to FIGS. 5B and 5C and FIGS. 6A to 6C described later.

  Subsequently, the central portion in the width direction (bending direction) of the metal plate 60 obtained in FIG. 5A is pressed with the male mold 103 and the female mold 104 shown in FIG. It is preferably bent to approximately 1/4 arc).

  Next, as shown in FIG. 5C, the core mold 105 is disposed inside the metal plate 60 obtained in FIG. 5B, and the upper mold 106 and the lower mold 107 shown in FIG. 6A to 6C, the end faces 61a and 61b of the both side portions 62a and 62b of the metal plate 60 are brought close to each other.

  Here, the outer diameter of the core mold 105 shown in FIG. 5C and FIGS. 6A to 6C is equal to the inner diameter of the cylindrical hollow pipe to be formed. The radius of the press surface 106c of the upper die 106 and the radius of the press surface 107a of the lower die 107 are equal to the radius of the outer diameter of the hollow pipe to be formed. Further, as shown in FIGS. 6A to 6C, the upper mold 106 is a pair of left and right split molds, and the split molds 106a and 106b are configured to be able to move up and down independently.

  That is, from the state shown in FIG. 5 (c), the right split mold 106a is lowered relative to the lower mold 107 as shown in FIG. 6 (a). ), One side of the metal plate 60 is pressed and bent into a substantially semicircular shape. The lower mold 107 may also be a pair of left and right split molds as in the upper mold 106 (see the split surface 107b), and the lower mold on the same side may be raised during the process shown in FIG.

  Next, as shown in FIG. 6 (b), the core mold 105 is lowered slightly (so that the end surface 61a on one side and the end surface 61b on the other side can be brought close to each other), and the split on the other side is made. The mold 106b is lowered and the other side of the metal plate 60 is pressed and bent into a substantially semicircular shape.

  Thereafter, as shown in FIG. 6C, the core mold 105 and the pair of split molds 106a and 106b are lowered to form a cylindrical hollow pipe (roller body 16). In this state, the left and right end surfaces 61a and 61b are sufficiently close to each other through a slight gap. That is, in this cylindrical hollow pipe, both end surfaces 61a and 61b of the metal plate 60 as a base material are close to each other, so that a joint is formed between these both end surfaces 61a and 61b. The joint has a gap by separating both end faces 61a and 61b.

  Next, in this embodiment, in order to increase the roundness of the formed hollow pipe (roller body 16) and reduce the runout, a conventionally known centerless polishing process is performed, and the outer peripheral surface of the hollow pipe (roller body 16). To polish. As a result, the roundness of the hollow pipe becomes better than that before the centerless polishing process, and the roller body 16 has a small deflection amount.

  In the press work and the centerless polishing process, it is preferable that the gap between the both end faces 61a and 61b of the metal plate 60 is eliminated, that is, the both end faces 61a and 61b are in contact with each other. However, it is very difficult to completely eliminate the gap while improving the roundness and the amount of deflection of the hollow pipe (roller body 16) to be obtained, so that a certain degree of gap is formed at present. Become.

  FIG. 7 is a perspective view of a portion of the fitting portion 82 formed on the roller body 16. As described with reference to the pressing process diagrams of FIGS. 5A to 5C and FIGS. 6A to 6C, the metal plate 60 is pressed, and both side portions 62a and 62b of the metal plate 60 are formed. When bent into an arc shape, the protruding portion 80 protruding in the protruding direction D2 from the end surface 61a side is fitted into the recess 81 (see FIG. 4B) formed on the end surface 61b side, so that the fitting portion 82 is formed. It is formed.

  The fitting portion 82 is provided outside the range R of the recording area in FIG. In the present embodiment, the fitting portion 82 is provided at a position overlapping the bearing portion 70 in the axial direction D1 of the roller body 16.

  By forming the fitting portion 82, the end surface 61 a and the end surface 61 b of the roller body 16 are prevented from separating in the circumferential direction of the outer peripheral surface 63. Moreover, it is suppressed that the end surface 61a and the end surface 61b of the roller main body 16 shift | deviate to the axial direction D1.

  After forming the roller body 16 in this way, the high friction layer 50 is formed on the surface of the roller body 16 as shown in FIG. As a method for forming the high friction layer 50, a dry method and a wet method (or a method using both of them) can be employed. In this embodiment, the dry method is preferably employed. Specifically, first, resin particles and inorganic particles are prepared as a material for forming the high friction layer 50. As the resin particles, fine particles having a diameter of about 10 μm made of an epoxy resin or a polyester resin are preferably used.

As inorganic particles, ceramic particles such as aluminum oxide (alumina; Al ₂ O ₃ ), silicon carbide (SiC), silicon dioxide (SiO ₂ ) and the like are preferably used.

  Next, the positional relationship between the transport roller 15 and the bearing unit 70 when the transport roller 15 is provided in the bearing unit 70 will be described. As shown in FIG. 7, in the fitting part 82, the part (length L1) which the protrusion part 80 protruded from the outer peripheral surface 63 of the roller main body 16 may be formed.

  FIG. 8A is a diagram of the transport roller 15 provided in the bearing unit 70 as seen from the axial direction D1 of the rotation center X. FIG. The roller body 16 is rotatably held by a sliding surface 71 as a sliding portion of the bearing portion 70.

  When the roller body 16 rotates in the rotation direction D3, the paper P that is in contact with the high friction layer 50 formed on the roller body 16 is conveyed in the discharge direction D4. The discharge direction D4 is a conveyance direction when characters or images are recorded by the reciprocating operation of the print head 21 or when the recorded paper P is discharged.

  FIG. 8B is an enlarged view of the fitting portion 82 that slides on the sliding surface 71 of FIG. The protrusion direction D2 (see FIG. 7) in which the protrusion 80 protrudes is opposite to the rotation direction D3 of the protrusion 80 in FIG. 8B when the roller body 16 is rotated in the rotation direction D3 and the paper P is discharged. The roller main body 16 is provided in the bearing part 70 so that it becomes.

(Comparative example)
FIG. 14A is a diagram illustrating the positional relationship between the transport roller 15 and the bearing unit 70 as a comparative example. FIG. 14B is an enlarged view of a portion of the fitting portion 82 that slides on the sliding surface 71 of FIG. 14A of the comparative example. In the comparative example, the protruding direction D2 in which the protruding portion 80 protrudes is the same direction as the rotating direction D3 of the protruding portion 80 in FIG. 14B when the roller body 16 is rotated in the rotating direction D3 and the paper P is discharged. The roller main body 16 is provided in the bearing part 70 so that it may become.

  As shown in FIG. 14 (b), as the roller body 16 rotates in the rotation direction D 3, the protruding portion 80 moves toward the upstream side in the relative movement direction D 5 of the sliding surface 71 with respect to the transport roller 15. The projecting direction D2 is projected, and the corner portion 801 is positioned upstream of the outer peripheral surface 802 of the projecting portion 80.

  The corner 801 is formed by the outer peripheral surface 802 and the end surface 803. The protruding portion 80 slides on the sliding surface 71 in a state where the end surface 803 faces the upstream side of the sliding surface 71. Thereby, since the sliding frictional resistance between the corner portion 801 and the sliding surface 71 is large, the sliding surface 71 may be damaged by the corner portion 801 of the protruding portion 80.

  As described above, the inkjet printer 1 of the present embodiment described above is formed into a cylindrical shape by pressing the pair of end surfaces 61a and 61b, and includes the conveyance roller 15 that conveys the paper P, and the outer peripheral surface 63 of the conveyance roller 15. And a bearing portion 70 that has a sliding surface 71 as a sliding portion to slide and holds the transport roller 15 rotatably.

  And the conveyance roller 15 has the fitting part 82 with which the protrusion part 80 formed in the one end surface 61a side and the recessed part 81 formed in the other end surface 61b side of a pair of end surface 61a, 61b fit. And the fitting portion 82 is disposed at a position overlapping the bearing portion 70 in the axial direction D1 of the transport roller 15, and the rotation direction D3 of the transport roller 15 when the protrusion direction D2 of the protrusion 80 discharges the paper P. A transport roller 15 is provided so as to be in the opposite direction.

  According to this configuration, as shown in FIG. 8B, as the conveyance roller 15 rotates in the rotation direction D <b> 3, in the relative movement direction D <b> 5 of the sliding surface 71 with respect to the conveyance roller 15, The projecting portion 80 projects in the projecting direction D2 toward the projecting direction D2, and the corner portion 801 is positioned downstream of the outer peripheral surface 802 of the projecting portion 80. That is, the protruding portion 80 slides on the sliding surface 71 in a state where the end surface 803 forming the corner portion 801 of the protruding portion 80 faces the downstream side of the sliding surface 71. 14 (b), the corner portion 801 of the comparative example is positioned upstream of the outer peripheral surface 802 of the protruding portion 80, and the protruding portion 80 is covered with the end surface 803 facing the upstream side of the sliding surface 71. It becomes smaller than the sliding frictional resistance when sliding with the sliding surface 71. Therefore, the sliding surface 71 can be prevented from being damaged by the protrusion 80.

(Embodiment 2)
Embodiment 2 demonstrates the conveyance roller which provided the protrusion part which protruded to the inner peripheral side. As described in the first embodiment with reference to FIGS. 5A and 5B, the both side portions 62 a and 62 b of the metal plate 60 are bent into an arc shape using the male mold 101 and the female mold 102.

  FIG. 9A is a view of the roller body 16a viewed from the axial direction D1 of the rotation center X. FIG. The protruding portion 80a is fitted to the recessed portion 81 in a state where the protruding portion 80a protrudes to the inner peripheral side from the extension line J that extends the outer peripheral surface 64 of the roller body 16a in a circular shape.

  Next, a method for projecting the projecting portion 80a toward the inner peripheral side will be described. FIG. 9B is a view as seen from the axial direction D1, and shows the roller body 16a that is pressed using the split dies 106a and 106d, the lower die 107, and the core die 105a that constitute the upper die.

  Fig.10 (a) is a figure which shows the recessed part 81 (refer FIG.4 (b)). FIG. 10B is a perspective view of the split mold 106d, and is a perspective view of the split mold 106d viewed from the lower mold 107 side. FIG. 11A is a view of the split mold 106d viewed from a direction orthogonal to the axial direction D1. FIG.11 (b) is the figure which looked at the split mold 106d from the axial direction D1.

  One split mold 106a of the pair of split molds 106a and 106d constituting the upper mold in the second embodiment is the same as the shape of the split mold 106a in the first embodiment. The other split mold 106d is different in shape from the split mold 106b of the first embodiment. Moreover, the lower mold | type 107 in Embodiment 2 is the same shape as the lower mold | type 107 of Embodiment 1 comprised from a pair of split mold | die which provided the split surface 107b.

  A projection 1060 is formed on the split mold 106d. The length L4 of the protrusion 1060 in the axial direction D1 in FIGS. 10B and 11A is shorter than the length L2 of the recess 81 in the axial direction D1 in FIG. Further, the length L6 of the protrusion 1060 in the direction orthogonal to the axial direction D1 in FIG. 11B is shorter than the length L3 of the recess 81 in the direction orthogonal to the axial direction D1 in FIG.

  FIG. 10C is a perspective view of the core mold 105a. A cutout portion 1050 is formed in the core mold 105a. When the metal plate 60 is processed into a cylindrical shape by press working using the split dies 106a and 106d, the lower die 107, and the core die 105a in FIG. 9B, the position of the notch 1050 in the axial direction D1 is the protrusion. It arrange | positions so that it may become a position facing 1060. In the axial direction D1, the length L7 of the notch 1050 is longer than the length L4 of the protrusion 1060.

  When the metal plate 60 is processed into a cylindrical shape by pressing using the split molds 106a and 106d, the lower mold 107, and the core mold 105a, the protrusion 1060 is brought into contact with the protrusion 80a and pushed into the inner peripheral side. Therefore, as shown in FIG. 9A, the protruding portion 80 a can be formed in a shape protruding from the extension line J of the outer peripheral surface 64 toward the inner peripheral side.

  With this configuration, it is possible to prevent the sliding surface 71 from being damaged when the roller body 16a slides on the sliding surface 71 (see FIG. 8) of the bearing portion 70 as the roller body 16a rotates. . Moreover, the fluctuation | variation of the position of the rotation center X of the roller main body 16a can be reduced. Other configurations of the ink jet printer in the present embodiment are the same as the configurations of the ink jet printer 1 described in the first embodiment.

(Embodiment 3)
In the third embodiment, an ink jet printer in which a groove portion is provided in a sliding portion of a bearing portion will be described. FIG. 12 is a perspective view of the bearing portion 70a in the present embodiment. In the sliding portion 75 of the bearing portion 70a of the present embodiment, sliding surfaces 72 and 73 that slide with the outer peripheral surface 63 of the roller body 16 in FIG. 7 are formed.

  A groove portion 74 is formed in the sliding portion 75 in a range where the fitting portion 82 of FIG. 7 is arranged in the axial direction D1. The width L9 in the axial direction D1 of the groove 74 is longer than the length L8 in the axial direction D1 of the protrusion 80 in FIG. Further, the depth of the groove 74 is formed deeper than the length L <b> 1 where the protruding portion 80 protrudes from the outer peripheral surface 63.

  Thereby, it can suppress that the to-be-slid part 75 is damaged with rotation of the roller main body 16. FIG. Other configurations of the ink jet printer in the present embodiment are the same as the configurations of the ink jet printer 1 described in the first embodiment.

  In the first to third embodiments, the fitting portion 82 is formed by the rectangular protrusions 80 and 80a and the rectangular concave portion 81, but the fitting portion has a trapezoidal shape, a triangular shape, or a semicircular shape. May be.

  FIG. 13A is a diagram showing a roller main body 16b that includes a protrusion 91 and a recess 90 in which the fitting portion has a trapezoidal shape. FIG. 13B is a view showing a roller main body 16 c configured by a protruding portion 93 and a concave portion 92 having a triangular fitting portion. FIG. 13C is a view showing a roller main body 16d constituted by a projecting portion 95 and a concave portion 94 having a semicircular fitting portion.

  In the first to third embodiments, the transport roller 15 provided in the ink jet printer has been described. However, the present invention is also applied to the transport roller provided in the electrophotographic printer provided with the photosensitive member.

  DESCRIPTION OF SYMBOLS 1 ... Inkjet printer, 15 ... Conveyance roller, 16, 16a, 16b, 16c, 16d ... Roller main body, 60 ... Metal plate, 61a, 61b ... End face, 63, 64 ... Outer peripheral surface, 70, 70a ... Bearing part, 71, 72, 73: sliding surface, 74: groove portion, 75: sliding portion, 80, 80a, 91, 93, 95 ... projecting portion, 81, 90, 92, 94 ... concave portion, 82 ... fitting portion, D1 ... Axial direction, D2 ... projection direction, D3 ... rotation direction, L8 ... length of projection, L9 ... width of groove.

Claims (1)

A transport roller configured to transport a recording medium, having a joint configured such that a pair of ends face each other;
A bearing unit that has a sliding portion that slides with an outer peripheral surface of the conveyance roller, and that rotatably holds the conveyance roller;
With
The conveyance roller is fitted with a protrusion formed on one end side of the pair of end portions and a recess formed on the other end side of the pair of end portions. Having a fitting part,
The fitting portion is disposed at a position overlapping the bearing portion in the axial direction of the transport roller,
The sliding portion of the bearing portion is formed with a groove having a width longer than the length of the protruding portion in the axial direction at a location corresponding to the protruding portion .
Furthermore, the depth of the groove portion of the sliding portion of the bearing portion is formed deeper than the length of the protruding portion protruding from the outer peripheral surface of the transport roller.
A recording apparatus.

Images