JP6375766B2 - Elastic body moving device and component manufacturing method - Google Patents

Description

  The present invention relates to an elastic body moving device and a part manufacturing method.

  Patent Document 1 discloses a configuration in which the tip surface 32 of the pressing jig 20 is brought into contact with the upper surface of the elastic ring 11 held on the outer periphery of the conical portion 16A of the guide jig 16 as shown in FIG. Has been.

JP 2003-300119 A

  The elastic body having the edge of the through hole in contact with the member having the conical portion is pressed by bringing the flat end surface into contact with the side opposite to the side where the elastic body contacts the conical portion, and is pressed. If the elastic body is moved to a non-existing portion, there is a risk that the elastic body will crack.

  In the present invention, when the edge of the through hole of the elastic body is brought into contact with the member having the conical portion, the elastic body is pressed, and the elastic body is cracked when the elastic body is moved to a portion having no conical portion in the member having the conical portion. It is intended to make it difficult to generate.

The elastic body moving device according to claim 1 includes a cylindrical body having an end surface in which a plurality of protrusions and dents are alternately formed in a sine wave shape along a circumferential direction at an axial end portion, and a member having a conical portion. In the elastic body in which the edge of the through hole is in contact with the conical portion, the circumferential surface of the end surface is brought into contact with the opposite side to the side in contact with the conical portion, and the cylindrical body is rotated with the plurality of protrusions adjacent to each other. The elastic body is pressed while rotating more than the largest angle of the directions, and the elastic body is moved to a portion of the member that does not have the conical portion.

An elastic body moving device according to a second aspect is the elastic body moving device according to the first aspect , wherein the plurality of protrusions are arranged uniformly in the rotation direction.

An elastic body moving device according to a third aspect is the elastic body moving device according to the first or second aspect , wherein three of the plurality of protrusions are formed.

According to a fourth aspect of the present invention, there is provided a method for manufacturing the component, the step of bringing the edge of the through hole of the elastic body in which the through hole is formed into contact with the member having the conical portion, and a plurality of axial end portions along the circumferential direction. With the cylindrical body having end surfaces in which protrusions and dents are alternately formed in a sinusoidal shape, the entire circumference in the circumferential direction of the end surface is brought into contact with the side opposite to the side in contact with the conical portion of the elastic body. Pressing the cylindrical body while rotating the cylinder more than the largest angle in the rotation direction where the plurality of protrusions are adjacent to each other, and moving the elastic body to a portion of the member without the conical portion. .

The elastic body moving device according to claim 1 is configured to be elastic to a portion having no conical portion in a member having a conical portion while rotating the cylindrical body less than the smallest angle of rotation directions in which a plurality of protrusions are adjacent to each other. Compared to an elastic body moving device that moves the body, it is difficult to cause cracks in the elastic body.

The elastic body moving device according to claim 2 is less likely to cause cracks in the elastic body than an elastic body moving device in which the plurality of protrusions are not evenly arranged in the rotation direction.

The elastic body moving device according to claim 3 is less likely to cause cracks in the elastic body than an elastic body moving device in which the plurality of protrusions formed on the end face of the cylinder are not three.

In the method for manufacturing a component according to claim 4, there is no conical portion in the member having the conical portion while rotating the cylindrical body less than the smallest angle among the rotation directions in which the plurality of protrusions are adjacent to each other. Compared to a method including a step of moving to a site, it is difficult to generate a crack in the elastic body.

It is sectional drawing of the rotary body manufactured using the elastic body moving apparatus of embodiment. It is the schematic (front view) which shows the shaft body and elastic body which were attached to the elastic body movement apparatus of this embodiment, and an elastic body movement apparatus, Comprising: It is a figure which shows the state at the time of the manufacture start of a rotary body. It is the schematic (front view) which shows the shaft body and elastic body which were attached to the elastic body moving apparatus of this embodiment, and an elastic body moving apparatus, Comprising: It is a figure which shows the state at the time of manufacture of a rotary body. It is the schematic (front view) which shows the shaft body and elastic body which were attached to the elastic body moving apparatus of this embodiment, and an elastic body moving apparatus, Comprising: It is a figure which shows the state at the time of completion | finish of manufacture of a rotary body. It is a perspective view of the cylinder which comprises the elastic body moving apparatus of embodiment. It is a perspective view of the cylinder which comprises the elastic body moving apparatus of a modification, Comprising: (A) is a figure which shows the case where the protrusion 69 is two, (B) is the case where the protrusion 69 is four.

≪Overview≫
Hereinafter, embodiments will be described with reference to the drawings. First, the structure of the rotary body manufactured using the elastic body moving apparatus of embodiment is demonstrated. Next, the elastic body moving device of the embodiment will be described. Next, a method for manufacturing a rotating body using the elastic body moving device of the embodiment will be described. Next, the operation of the elastic body moving device and the rotating body manufacturing method of the embodiment will be described.

≪Rotating body≫
The rotating body 10 (see FIG. 1) manufactured using the elastic body moving device 40 (see FIGS. 2 to 4) of the embodiment includes a part of paper feeding parts used in the image forming apparatus (not shown). Has been. The rotating body 10 has a gear (not shown) fixed on the side opposite to the side where the distal end portion 28 (described later) is disposed, and constitutes a paper feeding component.

  The rotating body 10 includes a shaft body 20 and an elastic body 30. Here, the shaft body 20 is an example of a member having a conical portion.

[Shaft]
The shaft body 20 is a cylindrical body that is symmetric with respect to its own axis (one-dot chain line C in the figure). As shown in FIG. 1, the shaft body 20 includes a large diameter portion 22, a small diameter portion 24, a conical portion 26, and a tip portion 28. The large-diameter portion 22, the small-diameter portion 24, the conical portion 26, and the tip portion 28 are arranged along the own axis direction in the description order. In addition, the shaft body 20 is formed with a through hole having a diameter D1 around the own axis.

  The large diameter portion 22 is a portion having an outer peripheral surface having a diameter D2.

  The small diameter portion 24 is a portion having an outer peripheral surface having a diameter D3 (D3 <D2). The width of the small diameter portion 24 (a value corresponding to the distance in the own axis direction) is a width W1. Here, the small diameter portion 24 is an example of a portion having no conical portion.

  The conical portion 26 has a portion 26A having an outer peripheral surface with a diameter D4 (D3 <D4 <D2), and a diameter D4 to a diameter D5 (D5) as the diameter of the outer peripheral surface increases from the small diameter portion 24 side to the distal end portion 28 side. And a portion 26B having an outer peripheral surface that gradually decreases until <D4). The part 26A and the part 26B are arranged from the large diameter part 22 side to the tip part 28 side in the order of description.

  The tip portion 28 is a portion having an outer peripheral surface having a diameter D5.

  Here, the shaft body 20 will be supplemented. As described above, the small diameter portion 24 having the width W <b> 1 is disposed between the large diameter portion 22 and the portion 26 </ b> A constituting the conical portion 26 along the own axis direction of the shaft body 20. The diameter D3 of the small diameter portion 24 is smaller than the diameter D2 of the large diameter portion 22 and the diameter D4 of the portion 26A. That is, a groove having a width W1 (hereinafter referred to as a groove portion 25) is formed at a portion of the shaft body 20 where the small diameter portion 24 is disposed.

[Elastic body]
As shown in FIG. 1, the elastic body 30 has an annular shape in which a through hole 32 is formed. The elastic body 30 is fitted in the groove portion 25 of the shaft body 20. The elastic body 30 has an outer peripheral surface having a diameter D6 (D2 <D6) around the axis of the shaft body 20 in a state where the elastic body 30 is fitted in the groove portion 25. The elastic body 30 has a plane 34 and a plane 36 on the upper side and the lower side, respectively. The width of the elastic body 30 (a value corresponding to the distance between the plane 34 and the plane 36) W2 is smaller than the width W1 of the groove 25. Here, the flat surface 34 is an example of the side opposite to the side in contact with the conical portion of the elastic body.

  The elastic body 30 is softer than the shaft body 20 (is easily deformed). The elastic body 30 of the embodiment is natural rubber as an example. As shown in FIG. 2, the elastic body 30 has a through hole diameter D7 (D7 <D3) when not fitted into the groove 25 (natural length state). That is, the diameter D7 of the through hole 32 in the elastic body 30 in the natural length state is smaller than the diameter D3 of the through hole 32 in the elastic body 30 in the state of being fitted into the groove 25. Therefore, in a state where the elastic body 30 is fitted into the groove portion 25, the elastic body 30 is deformed by being expanded from the through hole 32 side to the groove portion 25.

  The above is description of the rotary body 10 manufactured using the elastic body moving apparatus 40 of embodiment.

≪Elastic body moving device≫
Next, the elastic body moving device 40 will be described with reference to the drawings.

  As shown in FIGS. 2 to 4, the elastic body moving device 40 moves the elastic body 30 in which the edge 32 </ b> A of the through hole 32 is in contact with the conical portion 26 of the shaft body 20 from the conical portion 26. It has a function of fitting into the 20 groove portions 25. From another viewpoint, the elastic body moving device 40 moves the elastic body 30 in which the edge 32A of the through hole 32 is in contact with the conical portion 26 of the shaft body 20 from the conical portion 26 to the small diameter portion 24 of the shaft body 20. It has a function to make it. In the following, the elastic body 30 in which the edge 32A of the through hole 32 is brought into contact with the conical portion 26 of the shaft body 20 as shown in FIG. 2 will be described as the elastic body 30 before movement.

  As shown in FIGS. 2 to 4, the elastic body moving device 40 includes a base 50, a cylindrical body 60, and a drive source 70.

[Stand]
The stand 50 has a function of supporting the shaft body 20. A round hole 52 is formed in the base 50. Then, the base 50 is fitted in the round hole 52 with one end portion in the axial direction of the shaft body 20 (one end portion of the large diameter portion 22) so that the tip end portion 28 of the shaft body 20 faces upward. The body 20 is supported. In a state where the base 50 supports the shaft body 20, the own axis of the round hole 52 overlaps with the own axis of the shaft body 20. 2 to 6 indicate the downward direction.

[Cylinder]
As shown in FIGS. 2 to 4, the cylindrical body 60 has a function of pressing the elastic body 30 by bringing an end face 68 described later into contact with the flat surface 34 of the elastic body 30 before moving.

  The cylindrical body 60 is a cylindrical body as shown in FIGS. 2 and 3, the cylindrical body 60 is moved downward while being rotated in the direction of arrow B about its own axis by a driving source 70 described later. The own axis of the cylindrical body 60 overlaps with the own axis of the round hole 52 formed in the base 50. The cylindrical body 60 is disposed at an initial position (not shown) separated from the elastic body 30 before the movement before the operation by the elastic body moving device 40 is started. Note that the position of the cylinder 60 in FIG. 2 is lower than the initial position, and is the contact start position at which the end surface 68 of the cylinder 60 moved from the initial position starts to contact the flat surface 34 of the elastic body 30. Yes.

  The cylindrical body 60 includes a side wall 62 and an upper wall 64.

  The side wall 62 is a wall disposed over the entire circumferential direction so as to surround the own axis, and has an inner peripheral surface with a diameter D8 (D4 <D8 <D6), an outer peripheral surface with a diameter D9 (D9 <D6), have. The upper wall 64 is a disk having a diameter D9 that is arranged along the direction intersecting the own axis direction around the own axis. In the upper wall 64, an opening 64A is formed around its own axis. The upper wall 64 is connected to the upper end of the side wall 62. Therefore, an opening is formed below the cylindrical body 60 (side wall 62).

  As shown in FIG. 5, an end face 68 whose height gradually changes along the circumferential direction is formed at the lower end portion (the end portion in the own axis direction) of the side wall 62. Specifically, the height of the end face 68 is formed in a sine wave shape along the circumferential direction. Then, when the lower side is a positive direction, the end surface 68 is alternately formed with a portion 68A having a maximum height and a portion 68B having a minimum height along the circumferential direction. ing. Here, a portion of the end face 68 that extends in the circumferential direction and is sandwiched between two minimum portions 68B formed adjacent to the maximum portion 68A is referred to as a protrusion 69. That is, a plurality (three) of protrusions 69 are formed on the end surface 68 of the embodiment. Further, as described above, since the height of the end face 68 is formed in a sine wave shape along the circumferential direction, the maximum portion 68A is evenly spaced from the end face 68 in the circumferential direction (by 120 ° apart). Are arranged). In other words, it can be said that the three protrusions 69 are arranged uniformly (120 ° apart) on the end face 68 in the circumferential direction. From another point of view, it can be said that the three dents are arranged equally (120 ° apart) on the end face 68 in the circumferential direction. Here, the three dents are parts extending in the circumferential direction on the end face 68, and are parts sandwiched between two parts 68A having the maximum value formed next to the part 68B having any minimum value. Say. In the following description, the height H of the protrusion 69 refers to the height of the portion 68A having the maximum value with reference to the portion 68B having the minimum value and the positive direction in the lower direction of the cylindrical body 60.

  The height H of the protrusion 69 is such that the end surface 68 is stretched over the entire circumference in the circumferential direction during the period in which the end surface 68 of the cylindrical body 60 is in contact with and pressed against the flat surface 34 of the elastic body 30 before movement. It is set as the height which contacts (refer FIG. 3). In addition, the height H of the protrusion 69 of the embodiment is set to 0.5 mm as an example.

  Moreover, as shown in FIGS. 2 to 4, the end face 68 of the side wall 62 has a circular cross section.

[Drive source]
The drive source 70 has a function of moving the cylindrical body 60 downward and a function of rotating the cylindrical body 60 about its own axis.

  As shown in FIGS. 2 to 4, the drive source 70 includes a main body 72 and a shaft 74.

  The main body 72 is a compact cylinder as an example. The shaft 74 is fixed to the edge of the opening 64 </ b> A of the upper wall 64 of the cylindrical body 60. The own axis of the shaft 74 overlaps the own axis of the cylindrical body 60.

  The main body 72 moves the shaft 74 downward while rotating the shaft 74 around its own axis. Therefore, the main body 72 moves the cylindrical body 60 fixed to the shaft 74 from the above-described initial position to the final position while rotating around the own axis (rotating in the direction of arrow B in FIGS. 2 and 3). It is like that. Here, the final position is a vertical position of the cylinder 60 shown in FIG. 4, and the cylinder 60 moves the elastic body 30 by the drive source 70, and the elastic body 30 is fitted into the groove 25. It is set as the position of the cylinder 60 at the time. As shown in FIG. 4, the flat surface 36 of the elastic body 30 is in contact with the boundary (stepped portion) between the large diameter portion 22 and the small diameter portion 24 of the shaft body 20 at the final position.

  The main body 72 rotates the shaft 74 around its own axis by 130 ° as an example during the period in which the cylinder 60 is moved from the contact start position (see FIG. 2) to the final position (see FIG. 4) by the shaft 74. It is like that. Accordingly, the protrusion 69 of the cylindrical body 60 is an angle 120 in which the plurality of protrusions 69 are arranged apart from each other in the circumferential direction in the period in which the cylindrical body 60 moves from the contact start position to the final position. It is designed to rotate more than °. In other words, the protrusion 69 of the cylindrical body 60 is configured to be rotated by an angle of the rotation direction in which the plurality of protrusions 69 are adjacent to each other. In addition, the angle 120 ° at which the plurality of protrusions 69 are spaced apart in the circumferential direction is the largest angle in the rotation direction in which the plurality of protrusions 69 are adjacent to each other.

  When the main body 72 moves the cylinder 60 from the contact start position to the end position, the cylinder 60 is moved downward by a distance H1 (> W1> W2) (see FIG. 2) in the elastic body moving device 40. From another viewpoint, the projection 69 of the cylindrical body 60 is in contact with the flat surface 34 of the elastic body 30 over the entire circumference until the elastic body 30 is moved downward by a distance H1 (> W2). It has become.

  The above is the description of the elastic body moving device 40 according to the embodiment.

≪Rotating body manufacturing method≫
Next, the manufacturing method of the rotary body 10 of embodiment is demonstrated, referring drawings. The method for manufacturing the rotating body 10 of the embodiment (hereinafter referred to as the present method) is manufactured by using the elastic body moving device 40 of the embodiment. The method includes a first step and a second step.

[First step]
The first step is a step of arranging the shaft body 20 and the elastic body 30 constituting the rotating body 10 in the elastic body moving device 40.

  Specifically, in the first step, as shown in FIG. 2, one end of the shaft body 20 in the axial direction is fitted into the round hole 52 of the base 50. Then, the shaft body 20 is supported by the base 50 with the distal end portion 28 facing upward. Next, in the first step, the elastic body 30 is disposed on the shaft body 20 supported by the base 50 so that the edge 32 </ b> A of the through hole 32 contacts the conical portion 26 of the shaft body 20. When the above operation is performed, the first step is completed.

[Second step]
The second step is a step after the end of the first step, and is a step of fitting the elastic body 30 before the movement into the groove portion 25 of the shaft body 20.

  Specifically, in the second step, as shown in FIG. 2, the cylinder 60 is moved downward while the cylinder 60 disposed at the initial position is rotated around its own axis by the drive source 70. Further, as shown in FIG. 3, when the cylindrical body 60 is moved downward, the cylindrical body 60 reaches the contact start position, and the entire circumferential direction of the end surface 68 is brought into contact with the flat surface 34 of the elastic body 30. However, it bites into the elastic body 30. Further, when the cylindrical body 60 is moved downward, the cylindrical body 60 moves the elastic body 30 downward while pressing the elastic body 30 with the end face 68 to deform the elastic body 30. Then, as shown in FIG. 4, when the cylindrical body 60 moves to the final position, the elastic body 30 is fitted into the groove portion 25 of the shaft body 20. Here, in the second step, the elastic body 30 is not rotated with the rotation of the cylindrical body 60 during a period in which the elastic body 30 is pressed by the cylindrical body 60 rotated about its own axis and moved downward. However, the elastic body 30 may be slightly deviated around its own axis with the rotation of the cylindrical body 60, that is, accompanying movement may occur. Even in this case, the projections 69 of the cylindrical body 60 are arranged so that the cylindrical body 60 moves from the contact start position to the final position so that the projections 69 of the cylindrical body 60 contact the entire plane 34 of the elastic body 30. During the period of movement, the plurality of protrusions 69 are rotated along the circumferential direction by an angle of 120 ° or more that is spaced apart in the circumferential direction.

  As described above, in the second step, the elastic body moving device 40 rotates the cylindrical body 60 and moves it downward while moving the elastic body 30 before the movement from the conical portion 26 downward, thereby moving the elastic body 30. Fit into the groove 25. Note that, in the second step, the main body 72 rotates the shaft 74 so that the cylindrical body 60 is 130 ° along the circumferential direction during the period in which the cylindrical body 60 moves from the contact start position to the final position. The protrusions 69 are rotated more than the angle in the adjacent rotation direction. When the above operation is performed, the second step ends. Then, when the second step is finished, the present method is finished.

  The above is the description of this method. The rotating body 10 manufactured by this method is removed from the elastic body moving device 40, and the gear is fixed to the rotating body 10 in a subsequent process to become a paper feeding component.

≪Action≫
Next, the operation of the elastic body moving device 40 and the method of the embodiment will be described with reference to the drawings. In the following description, first, the embodiment will be compared with the comparison mode assumed below. In the comparative embodiment, when using the parts used in the elastic body moving device 40 of the embodiment, or when performing the process of this method, the description will be made using the reference numerals of the parts and the names of the respective processes as they are. Next, the mechanism of the operation of the feature point of the elastic body moving device 40 and this method in the embodiment will be described without comparing with the comparative embodiment.

[Comparison with Comparative Form (Operation by Protrusion 69)]
The elastic body moving device (hereinafter referred to as a “comparing device”) of the comparative form has no protrusion 69 formed on the end surface of the cylinder. In other words, the end surface of the cylindrical body is a surface having the same height over the entire circumference (the cross section is an arc-shaped surface). Further, in the comparison device, the main body constituting the drive source cannot rotate the shaft 74. Except for these points, the comparison device has the same configuration as the elastic body moving device 40 of the embodiment.

  Moreover, the manufacturing method (henceforth a comparison method) of the rotary body using a comparison apparatus uses a 1st process (process which arrange | positions the elastic body 30 in the shaft body 20) and a 2nd process (it is called a comparison method). After completion of the first step, a step of fitting the elastic body 30 into the groove portion 25 of the shaft body 20 is performed. Except for this point, the method is the same as this method.

  When the second step is performed using the comparison device, the elastic body 30 is in the circumferential direction of the plane 34 during the period in which the end face of the cylinder is in contact with the plane 34 of the elastic body 30 and the cylinder presses the elastic body 30. It is pressed with equal force from the end face of the cylinder over the circumference.

  Specifically, the end surface of the cylindrical body is brought into contact with the flat surface 34 of the elastic body 30 while the elastic body 30 is supported by the conical portion 26 from the inner peripheral surface side (through hole 32 side). Therefore, the elastic body 30 is pressed by the cylinder body with an equal force over the entire circumference in the circumferential direction. In particular, the portion of the elastic body 30 sandwiched between the end face of the cylindrical body and the lower end of the conical portion 26 during the pushing process has its inner peripheral surface expanded to the maximum diameter (diameter D4). Compared with the part, the largest pressing force is received from both the flat surface 34 side and the inner peripheral surface side, and the entire region in the circumferential direction is compressed. Therefore, the elastic body 30 becomes difficult to move beyond the lower end portion of the conical portion 26 while being deformed, and the elastic body 30 may be cracked. And when a crack generate | occur | produces in the elastic body 30, the rotary body 10 will be inferior goods. That is, in the comparison method, the rotating body 10 may be defective.

  On the other hand, in the elastic body moving device 40 of the embodiment, a plurality of protrusions 69 are formed on the end surface 68 of the cylindrical body 60. Therefore, when the second step is performed by the elastic body moving device 40 according to the embodiment, the elastic body 30 is pressed from the end surface 68 with an unequal force over the entire circumference of the flat surface 34.

Then, a portion sandwiched between the lower end portion of the end surface 68 and the conical portion 26 of the cylindrical body 60 of the elastic body 30, because over the entire circumference Ru is pressed by unequal forces, over an entire region in a circumferential direction Are not compressed with equal force. Therefore, the elastic body 30 pressed by the elastic body moving device 40 of the embodiment is more easily deformed when moving beyond the lower end of the conical portion 26 than the elastic body 30 pressed by the comparison device. From another point of view, since a recess is formed in the end surface 68 of the housing 60, a portion pressed by a relatively strong force in the elastic body 30 easily escapes to the recess and is deformed.

  Therefore, the elastic body moving device 40 of the embodiment is less likely to cause a crack in the elastic body 30 than the comparison device. Further, in this method, manufacturing defects of the rotating body 10 due to cracks in the elastic body 30 are suppressed as compared with the comparative method.

[Operation by Feature Point in Embodiment]
Next, the mechanism of the operation of the feature point of the elastic body moving device 40 and this method in the embodiment will be described without comparing with the comparative embodiment.

[Operation of three protrusions arranged on the end face]
In the elastic body moving device 40 of the embodiment, a plurality (three) of protrusions 69 are arranged on the end surface 68. If there are two protrusions 69 (in the case of the cylindrical body 60A in FIG. 6A), when the two protrusions 69 come into contact with and press against the elastic body 30, the contact stability is poor. Further, if there are four or more protrusions 69 (the cylindrical body 60B in FIG. 6B has four protrusions 69), it is difficult to make all the protrusions 69 contact the elastic body 30 evenly. Therefore, it can be said that the number of the plurality of protrusions 69 is preferably three. Note that the technical case of the present invention also applies to the case where the number of the protrusions 69 is two or four or more, that is, the case where the elastic body moving device 40 is replaced with the cylindrical body 60 by the cylindrical body 60A or the cylindrical body 60B. Included in the range. Here, the cylindrical body 60A and the cylindrical body 60B are modifications of the cylindrical body 60 of the embodiment. Further, in the elastic body moving device 40, an elastic body moving device that is replaced with the cylindrical body 60 and has a cylindrical body 60A or a cylindrical body 60B is a modification of the elastic body moving device 40 of the embodiment.

[Effects of a plurality of protrusions arranged uniformly in the circumferential direction]
In the elastic body moving device 40 of the embodiment, a plurality (three) of the protrusions 69 are equally arranged in the circumferential direction (rotation direction). Therefore, when the plurality of protrusions 69 press the elastic body 30, the greatly deformed portions of the elastic body 30 are evenly separated along the circumferential direction. Therefore, it is easier to deform the elastic body 30 in the circumferential direction than when the elastic body 30 is pressed by the elastic body moving device in which the plurality of protrusions 69 are unevenly arranged in the circumferential direction. Therefore, it can be said that the plurality of protrusions 69 are preferably arranged uniformly in the circumferential direction. Note that a case where the plurality of protrusions 69 are unevenly arranged in the circumferential direction is also included in the technical scope of the present invention.

[Operation by rotating the cylinder 60]
In the elastic body moving device 40 of the embodiment, the cylinder body 60 is rotated along the circumferential direction during the period in which the cylinder body 60 moves from the contact start position to the end position. If it does so, the site | part of the elastic body 30 which contacts the lower end part (site | part of the diameter D4) of the cone part 26 will be pressed by the unequal force which fluctuates over the circumferential direction perimeter.

  Therefore, the elastic body moving device 40 of the embodiment is less likely to cause a crack in the elastic body 30 than an elastic body moving device in which the cylindrical body 60 does not rotate. In addition, in this method, manufacturing defects of the rotating body 10 due to cracks in the elastic body 30 are suppressed as compared to a manufacturing method of a rotating body using an elastic body moving device in which the cylindrical body 60 does not rotate. An elastic body moving device in which the cylinder 60 does not rotate is included in the technical scope of the present invention.

  Further, in the elastic body moving device 40 of the embodiment, the cylindrical body 60 on which the three protrusions 69 that are uniformly arranged on the end surface 68 are formed during the period in which the cylindrical body 60 moves from the contact start position to the final position. It is rotated 130 ° along the direction. In other words, the plurality of protrusions 69 are rotated by an angle (120 °) or more in the rotation direction where at least the plurality of protrusions 69 are adjacent to each other. That is, the elastic body 30 before the movement has a portion 68 </ b> A where the height of the end face 68 is the maximum value and the minimum value over the entire circumference in the period from when the elastic body 30 is brought into contact with the cylindrical body 60 until it is fitted into the groove 25. It is pressed by the part 68B which becomes. Therefore, since the entire circumferential direction of the flat surface 34 of the elastic body 30 is pressed at least once by the portions 68A and 68B, the elastic body 30 can be moved downward while a part of the circumferential direction of the elastic body 30 is largely deformed. Absent.

  Therefore, the elastic body moving device 40 according to the embodiment is less likely to cause a crack in the elastic body 30 than an elastic body moving device in which the plurality of protrusions 69 are rotated by less than an angle in the adjacent rotation direction. In addition, the present method is more effective for the rotating body 10 caused by the cracks in the elastic body 30 than the manufacturing method of the rotating body using the elastic body moving device in which the plurality of protrusions 69 are rotated by less than an angle in the adjacent rotation direction. Manufacturing defects are suppressed. An elastic body moving device in which the cylindrical body 60 is rotated by less than 120 ° is included in the technical scope of the present invention.

  As described above, the present invention has been described in detail with respect to specific embodiments. However, the present invention is not limited to the above-described embodiments, and other embodiments are possible within the scope of the technical idea of the present invention. It is.

  For example, the shaft body 20 constituting the rotating body 10 manufactured by this method has been described as if it were made of metal with reference to FIGS. However, if the shaft body 20 is harder than the elastic body 30 (if it is difficult to deform), the shaft body 20 may not be made of metal. For example, you may be comprised with resin, the composite material of a metal and resin, wood, and other materials.

  Moreover, the cylindrical body 60 which comprises the elastic body moving apparatus 40 of embodiment was demonstrated as if it was resin, referring FIGS. However, when the cylindrical body 60 is pressed by bringing the end surface 68 into contact with the elastic body 30, the cylindrical body 60 may bite into the elastic body 30, and the end surface 68 may be in contact with the entire circumference in the circumferential direction. That is, the cylindrical body 60 only needs to be harder than the elastic body 30. For example, the cylinder 60 may be made of resin, metal, a composite material of metal and resin, wood, or other materials.

  Further, it has been described that the rotating body 10 manufactured by this method is a part of the paper feeding component used in the image forming apparatus. However, as long as the part is manufactured by moving the elastic body in which the through hole is formed, the rotating body 10 manufactured by this method may not be a part of the paper feeding part. Moreover, the rotary body 10 manufactured by this method may not be a rotary body. The rotating body 10 is an example of a component.

  Further, in the elastic body moving device 40 of the embodiment, the main body 72 constituting the drive source 70 has been described as moving the shaft 74 downward while rotating the shaft 74 around its own axis. However, the main body 72 may move the shaft body 20 in the vertical direction by moving the base 50 in the vertical direction in synchronization with the main body 72 without moving the shaft 74 downward.

  Further, in the elastic body moving device 40 of the embodiment, the main body 72 constituting the drive source 70 has been described as moving the shaft 74 downward while rotating the shaft 74 around its own axis. However, the main body 72 may be configured such that the base 50 is synchronized with the main body 72 and the shaft body 20 is rotated around the own axis without rotating the shaft 74 around the own axis.

  Further, in the elastic body moving device 40 of the embodiment, the main body 72 constituting the drive source 70 has been described as moving the shaft 74 downward while rotating the shaft 74 around its own axis. However, a member for fixing the cylindrical body 60 may be provided without providing the drive source 70 so that the base 50 moves up and down while rotating the shaft body 20.

  Moreover, in the elastic body moving apparatus 40 of embodiment, the end surface 68 of the cylinder 60 was demonstrated as the sine wave form over the circumferential direction. However, the end face 68 does not have to have a sine wave shape as long as the height changes gently along the circumferential direction. For example, the end face 68 (projection 69) may be a wave shape in which a plurality of sinusoidal shapes are overlapped along the circumferential direction, a wave shape having a different period depending on the region in the circumferential direction, or other wave shapes.

  Moreover, in the elastic body moving apparatus 40 of embodiment, the end surface 68 of the cylinder 60 was demonstrated as the sine wave shape over the circumferential direction, ie, the height of the some protrusion 69 was demonstrated. However, when the end surface 68 of the cylindrical body 60 is brought into contact with and pressed against the flat surface 34 of the elastic body 30, a plurality of protrusions can be formed as long as the portion of the end surface 68 that extends over the entire circumferential direction bites into the elastic body 30. The heights of 69 need not be the same.

  Further, in the elastic body moving device 40 of the embodiment, the main body 72 constituting the drive source 70 has been described as moving the shaft 74 downward while rotating the shaft 74 around its own axis. In this case, the main body 72 can change the rotational speed of the shaft 74, the downward movement speed of the upper shaft 74, and the like according to the shape of the elastic body, the hardness of the elastic body, the shape of the shaft body, and other conditions. Good.

  In addition, in the elastic body moving device 40 of the embodiment, the cylindrical body 60 is not mentioned as a replacement part, but can be replaced depending on the shape of the elastic body, the hardness of the elastic body, the shape of the shaft body, and other conditions. It is good.

  Moreover, in this method, it demonstrated as using the elastic body moving apparatus 40 of embodiment. However, if the rotating body 10 can be manufactured by the first step and the second step, the elastic body moving device 40 of the embodiment may not be used. For example, the edge 32 </ b> A of the through hole 32 of the elastic body 30 is brought into contact with the conical portion 26 of the shaft body 20, and the operator holds the cylindrical body 60 and presses the end surface 68 of the cylindrical body 60 against the flat surface 34 of the elastic body 30. The rotating body 10 may be manufactured.

  Further, in this method, it has been described that the cylindrical body 60 is rotated around its own axis during the period in which the cylindrical body 60 is moved from the initial position to the final position. However, the cylinder 60 may be rotated for a period during which the cylinder 60 is moved from the contact start position to the end position.

  In the second step of the method, the elastic body 30 is not rotated with the rotation of the cylindrical body 60 during the period in which the elastic body 30 is pressed downward and moved downward by the cylindrical body 60 rotated about its own axis. explained. However, the elastic body may be rotated with the rotation of the cylindrical body 60 by a combination of the elastic body and the shaft body (for example, a frictional relationship between the elastic body and the shaft body).

  In addition, the cylindrical body 60A and the cylindrical body 60B in the modified example of the elastic body moving device 40 of the embodiment are arranged evenly in the circumferential direction of the cylindrical body 60 with reference to FIGS. Explained as if it were. However, the protrusions 69 of the cylindrical body 60A and the cylindrical body 60B may be unevenly arranged in the circumferential direction.

10 Rotating body 20 Shaft body (an example of a member having a conical portion)
24 Small diameter part (an example of a part without a conical part)
26 Conical part 30 Elastic body 32A Edge 32 Through hole 34 Plane (an example of the side opposite to the side in contact with the conical part in the elastic body)
40 Elastic body moving device 60 Cylinder 60A Cylinder 60B Cylinder 68 End face 69 Projection

Claims (4)

A cylindrical body having an end surface in which a plurality of protrusions and dents are alternately formed in a sinusoidal shape along the circumferential direction at an axial end portion,
In the elastic body in which the edge of the through hole is brought into contact with the conical portion of the member having the conical portion, the entire circumferential direction of the end surface is brought into contact with the opposite side to the side in contact with the conical portion, so that the plurality of cylinders are attached to the plurality of conical portions . Pressing the elastic body while rotating more than the largest angle in the rotation direction adjacent to the protrusions , and moving the elastic body to a portion without the conical portion in the member;
Elastic body moving device. The plurality of protrusions are arranged uniformly in the rotation direction.
The elastic body moving device according to claim 1 . Three of the plurality of protrusions are formed,
The elastic body moving device according to claim 1 or 2 . A step of contacting the edge of the through hole of the elastic body in which the through hole is formed on a member having a conical portion;
A cylindrical body having an end face in which a plurality of protrusions and dents are alternately formed in a sine wave shape along a circumferential direction at an axial end, and the elastic body is opposite to the side in contact with the conical portion of the elastic body The entire circumference of the end surface is brought into contact with the cylindrical body, and the cylindrical body is pressed while rotating more than the largest angle in the rotational direction in which the plurality of protrusions are adjacent to each other, thereby pressing the elastic body in the cone of the member. A process of moving to a part-free site;
Of manufacturing parts including