JP2015004377A - Rotor and shaft, rotor support device, and electronic apparatus including rotor support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor support device which prevents lubrication failure of a rotor and stably rotates the rotor over a long period, and to provide an electronic apparatus including the rotor support device, and the rotor and a shaft which supports the rotor.SOLUTION: A drive transmission part 7 includes: a drive transmission gear 70; and a shaft part 71. The drive transmission gear 70 is rotatably supported by the shaft part 71. The shaft part 71 is inserted into an insertion part 70C of the drive transmission gear 70. A first inner peripheral part 701 and a second inner peripheral part 702 of the drive transmission gear 70 are supported by a first shaft part 711 and a second shaft part 712 of the shaft part 71. A taper part 713 is disposed between the first shaft part 711 and the second shaft part 712 of the shaft part 71. A grease storage part 70S capable of storing a lubricant is disposed between the first inner peripheral part 701 and the taper part 713.

Description

  The present invention relates to a rotating body support device that rotatably supports a rotating body, an electronic device including the rotating body support device, and a rotating body and a shaft.

  Conventionally, the technique described in Patent Document 1 is known as a rotating body support device that supports a rotating body. This technique discloses a rotating body support device that transmits a rotational driving force to an image carrier of an image forming apparatus. The rotating body support device includes a support shaft and a gear unit. The support shaft has a cylindrical shape, and protrudes in one direction from the support substrate. The gear portion is supported as a rotating body so as to be rotatable around a support shaft. The rotational driving force generated by the motor is transmitted to the image carrier through the rotating gear portion.

JP-A-9-197741

  In the rotating body support device described in Patent Document 1, the outer peripheral surface of the support shaft and the inner peripheral surface of the gear portion are arranged in parallel in the axial direction. For this reason, along with the long-term rotation of the gear portion, the grease applied to the outer peripheral surface of the support shaft flows out to the outside in the axial direction and is easily depleted. As a result, there has been a problem that poor rotation of the gear portion occurs due to poor lubrication.

  The present invention has been made to solve the above-described problems, and prevents a rotating body from being poorly lubricated and can stably rotate the rotating body over a long period of time. Another object of the present invention is to provide an electronic device including the same, and the rotating body and a shaft that supports the rotating body.

  A rotating body support device according to an aspect of the present invention is provided with a first outer peripheral portion and an outer diameter smaller than that of the first outer peripheral portion, which are spaced apart from each other in the axial direction with respect to the first outer peripheral portion. A shaft provided with two outer peripheral portions, and a tapered portion which is disposed between the first outer peripheral portion and the second outer peripheral portion and whose outer diameter is reduced from the first outer peripheral portion toward the second outer peripheral portion. And a rotating body that is rotatably supported by the shaft portion, and is disposed on one end side of the insertion portion in the axial direction. A first inner peripheral portion supported by one outer peripheral portion and extending so as to cover the first outer peripheral portion and the tapered portion along the axial direction; and the other end side of the insertion portion in the axial direction The second outer peripheral portion having an inner diameter smaller than that of the first inner peripheral portion. A rotating body including a second inner peripheral portion to be supported, and a lubricant storage portion formed between at least the first inner peripheral portion and the tapered portion and capable of storing a lubricant. Features.

  According to this configuration, the first outer peripheral portion and the second outer peripheral portion of the shaft portion support the first inner peripheral portion and the second inner peripheral portion of the rotating body, so that the rotating body is rotatably supported by the shaft portion. Is done. The tapered portion of the shaft portion is disposed between the first outer peripheral portion and the second outer peripheral portion, and the outer diameter of the tapered portion is reduced from the first outer peripheral portion toward the second outer peripheral portion. A lubricant reservoir that can store the lubricant is formed between the first inner peripheral portion and the tapered portion. For this reason, the lubricant stored in the lubricant storage part hardly flows out to the outside of the rotating body. As a result, poor lubrication of the rotating body is prevented, and the rotating body can be stably rotated over a long period of time.

  In the above configuration, the second inner peripheral portion is set to be shorter than the second outer peripheral portion in the axial direction so that a region adjacent to the tapered portion of the second outer peripheral portion is exposed, 1 inner peripheral part is extended so that the said exposed area | region of the said 2nd outer peripheral part may be covered along the said axial direction, The said lubricant storage part is a said 1st inner peripheral part, the said taper part, and It is desirable to form between the second outer peripheral portion.

  According to this configuration, the lubricant reservoir can be widely provided using a space between a part of the second outer peripheral portion and the first inner peripheral portion.

  Said structure WHEREIN: It is desirable for the said rotary body to be a rotation gear provided with the gear part arrange | positioned in the circumferential direction outer side rather than the said insertion part.

  According to this configuration, poor lubrication of the rotating gear is prevented, and the rotating gear can be stably rotated over a long period of time.

  In the above configuration, it is desirable that the rotating body is a pulley that supports a predetermined belt on the outer side in the circumferential direction than the insertion portion.

  According to this configuration, poor lubrication of the pulley is prevented, and the pulley can be stably rotated over a long period of time.

  An electronic apparatus according to another aspect of the present invention includes the rotating body support device according to any one of the above and a rotated body to which a rotational driving force is transmitted from the rotating body.

  According to this configuration, poor lubrication of the rotating body is prevented, and the rotating body can be stably rotated over a long period of time. As a result, the rotating body of the electronic device is stably rotated.

  In the above configuration, the rotated body is preferably a transport roller that transports a sheet.

  According to this configuration, the transport roller of the electronic device is stably rotated. Further, since the transport roller has a function of transporting the sheet, a load applied to the rotating body is relatively small. For this reason, even if it is the structure by which a rotary body is partially supported in a 1st outer peripheral part and a 2nd outer peripheral part, a rotary body and a shaft part are hard to be damaged, and rotational driving force is stably provided over a long period of time. It is possible to communicate.

  Moreover, the rotary body which concerns on the other situation of this invention is arrange | positioned at intervals in the axial direction with respect to the 1st outer peripheral part and the said 1st outer peripheral part, and is provided with an outer diameter smaller than a said 1st outer peripheral part. A second outer peripheral portion, and a taper portion that is disposed between the first outer peripheral portion and the second outer peripheral portion and whose outer diameter is reduced from the first outer peripheral portion toward the second outer peripheral portion. A rotating body having a cylindrical insertion portion into which a shaft is inserted and rotatably supported by the shaft portion, disposed on one end side of the insertion portion in the axial direction and supported by the first outer peripheral portion A first inner peripheral portion extending so as to cover the first outer peripheral portion and the tapered portion along the axial direction, and disposed on the other end side of the insertion portion in the axial direction, A second inner circumference having an inner diameter smaller than that of the first inner circumference and supported by the second outer circumference When provided with, at least between the first inner peripheral portion and the tapered portion, the lubricant is characterized in that it is formed a lubricant reservoir which is stored.

  According to this configuration, the rotating body can be prevented from being poorly lubricated, and can be rotated stably over a long period of time.

  In the above configuration, the second inner peripheral portion is set to be shorter than the second outer peripheral portion in the axial direction so that a region adjacent to the tapered portion of the second outer peripheral portion is exposed, It is preferable that the 1 inner peripheral portion extends so as to cover the exposed region of the second outer peripheral portion along the axial direction.

  According to this configuration, the lubricant reservoir can be widely provided using a space between a part of the second outer peripheral portion and the first inner peripheral portion.

  A shaft according to another aspect of the present invention includes the first outer peripheral portion, the second outer peripheral portion, and the tapered portion, and is inserted into the insertion portion of the rotating body described above, The rotating body is rotatably supported.

  According to this configuration, the rotating body can be stably supported for rotation over a long period of time.

  According to the present invention, a rotating body support device capable of preventing a rotating body from being poorly lubricated and stably rotating the rotating body over a long period of time, an electronic apparatus including the same, and the rotating body, A shaft for supporting the rotating body is provided.

1 is a schematic cross-sectional view illustrating a structure of an image forming apparatus according to an embodiment of the present invention. It is a disassembled perspective view of the drive transmission part which concerns on embodiment of this invention. It is sectional drawing of the drive transmission part which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the internal structure of an image forming apparatus 1 (electronic device) according to an embodiment of the present invention. Here, the image forming apparatus 1 is exemplified by a multifunction machine having a printer function and a copying function, but the image forming apparatus may be a printer, a copying machine, a facsimile machine, or the like.

<Description of Image Forming Apparatus>
The image forming apparatus 1 includes an apparatus main body 10 having a substantially rectangular parallelepiped housing structure, and an automatic document feeder 20 disposed on the apparatus main body 10. In the apparatus main body 10, a reading unit 25 that optically reads a document image to be copied, an image forming unit 30 that forms a toner image on a sheet, a fixing unit 60 that fixes the toner image on a sheet, and image formation A sheet feeding unit 40 that stores a regular sheet conveyed to the unit 30, and a regular sheet is conveyed from the sheet feeding unit 40 or the manual sheet feeding unit 46 to the sheet discharge port 10E via the image forming unit 30 and the fixing unit 60. The conveyance path 50 is accommodated. The apparatus main body 10 includes a right side surface 10R. The right side surface 10 </ b> R is a right side wall of the apparatus main body 10.

  An automatic document feeder (ADF) 20 is rotatably attached to the upper surface of the apparatus body 10. The ADF 20 automatically feeds a document sheet to be copied toward a predetermined document reading position in the apparatus main body 10. On the other hand, when the user manually places the document sheet on a predetermined document reading position, the ADF 20 is opened upward. The ADF 20 includes a document tray 21 on which a document sheet is placed, a document transport unit 22 that transports a document sheet via a document reading position, and a document discharge tray 23 that discharges a document sheet after reading.

  On the upper surface of the apparatus main body 10, a contact glass for reading a document sheet automatically fed from the ADF 20 or a contact glass (not shown) for reading a manually placed document sheet is arranged. The reading unit 25 optically reads an image on the document sheet through these contact glasses. The automatic document feeder (ADF) 20 and the reading unit 25 constitute the image reading device 2.

  The image forming unit 30 performs a process of generating a toner image and transferring it onto a sheet based on a known electrophotographic system. In other embodiments, other image forming methods such as an ink jet method may be employed.

  The image forming unit 30 includes a photosensitive drum 321 and a charger, an exposure device, a developing device, a cleaning device, and the like (not shown) disposed around the photosensitive drum 321.

  The photosensitive drum 321 rotates about its axis, and an electrostatic latent image and a toner image are formed on its peripheral surface. The charger uniformly charges the surface of the photosensitive drum 321. The exposure device includes a laser light source and optical devices such as a mirror and a lens, and forms an electrostatic latent image by irradiating the peripheral surface of the photosensitive drum 321 with light based on image data of an original image. The developing device supplies toner to the peripheral surface of the photosensitive drum 321 in order to develop the electrostatic latent image formed on the photosensitive drum 321. The cleaning device includes a cleaning roller and cleans the peripheral surface of the photosensitive drum 321 after the toner image is transferred.

  A transfer roller 35 is disposed to face the photosensitive drum 321. At the transfer nip portion between the photosensitive drum 321 and the transfer roller 35, the toner image on the photosensitive drum 321 is transferred to a sheet. A secondary transfer bias potential having a polarity opposite to that of the toner image is applied to the transfer roller 35.

  The sheet feeding unit 40 includes a two-stage first sheet feeding cassette 40A and a second sheet feeding cassette 40B that store a standard sheet P among sheets subjected to image forming processing. These paper feed cassettes can be pulled out from the front of the apparatus body 10 toward the front.

  The first sheet feed cassette 40A includes a sheet storage unit 41 that stores a sheet bundle formed by stacking the standard sheets P, and a lift plate 42 that lifts the sheet bundle for sheet feeding. A pick-up roller (not shown) and a roller pair of a paper feed roller 44 and a retard roller 45 are disposed on the upper right side of the paper feed cassette 40A. By driving the pickup roller and the sheet feeding roller 44, the uppermost sheet P of the sheet bundle in the sheet feeding cassette 40 </ b> A is fed out one by one and carried to the upstream end of the conveyance path 50. The second paper feed cassette 40B has the same configuration as the first paper feed cassette 40A.

  A manual paper feed unit 46 is disposed on the right side surface 10 </ b> R of the apparatus main body 10. The manual paper feed unit 46 includes a manual feed tray 46A for manual paper feed and a paper feed roller 461. The manual feed tray 46A is attached to the apparatus main body 10 so as to be openable and closable with a fulcrum part 701 disposed at the lower end thereof as a fulcrum. When manually feeding paper, the user opens the manual feed tray 46A as shown in the drawing and places a sheet thereon. The sheet feeding roller 461 is rotationally driven by a driving unit (not shown) and sends the sheet to the manual sheet conveyance path 460. Further, the sheet is carried into the conveyance path 50 from the manual sheet conveyance path 460.

  The conveyance path 50 extends from the paper feeding unit 40 through the image forming unit 30 and the fixing unit 60 to the sheet discharge port 10E. A registration roller pair 51 is disposed on the upstream side of the transfer nip portion of the conveyance path 50. The sheet is temporarily stopped by the resist roller pair 51 in a stopped state, and skew correction is performed. Thereafter, the registration roller pair 51 is rotationally driven by a drive unit (not shown) at a predetermined timing for image transfer, whereby the sheet is sent out to the transfer nip portion. In addition, a plurality of sheet conveyance rollers (not shown) for conveying the sheet are arranged in the conveyance path 50.

  A paper discharge roller 53 that conveys the sheet P is disposed at the most downstream end of the conveyance path 50. The paper discharge roller 53 discharges the sheet P from the sheet discharge port 10E. The sheet P discharged from the sheet discharge port 10E is discharged and stacked on the discharge unit 10U.

  The fixing unit 60 performs a fixing process for fixing the toner image on the sheet. A pressure roller is pressed against a fixing roller (not shown) to form a fixing nip portion. As the sheet passes through the fixing nip portion, the toner image transferred to the sheet is fixed to the sheet.

<Rotating body support device>
Next, with reference to FIG. 2 and FIG. 3, the drive transmission part 7 (rotary body support apparatus) which concerns on this embodiment is explained in full detail. FIG. 2 is an exploded perspective view of the drive transmission unit 7 according to the present embodiment. FIG. 3 is a cross-sectional view of the drive transmission unit 7 and shows a state in which the drive transmission gear 70 is attached to the shaft unit 71.

  The drive transmission unit 7 transmits a rotational driving force to the paper discharge roller 53 (a rotated body) described above. The drive transmission unit 7 includes a drive transmission gear 70 (rotary body) and a shaft unit 71 (shaft).

  The drive transmission gear 70 transmits a rotational driving force to the paper discharge roller 53. The drive transmission gear 70 is rotatably supported by the shaft portion 71. The shaft portion 71 serves as a rotating shaft of the drive transmission gear 70.

  Further, the image forming apparatus 1 includes a support frame 100 and a counter frame 102 (FIG. 3). The support frame 100 corresponds to a rear wall portion of the apparatus main body 10. In FIG. 2, a part of the support frame 100 is partially illustrated. The shaft portion 71 protrudes forward from the support frame 100. The support frame 100 includes a frame contact portion 101. A cylindrical tip 70 </ b> A <b> 1 to be described later contacts the frame contact portion 101. The opposing frame 102 is a wall portion that is disposed in front of the support frame 100 with an interval. The opposing frame 102 includes a frame hole 103. The frame hole 103 is a hole opened in the opposing frame 102. As described later, the shaft tip portion 714 is inserted into the frame hole portion 103, and the opposed frame 102 supports the shaft tip portion 714 of the shaft portion 71.

  The shaft portion 71 includes a first shaft portion 711 (first outer peripheral portion), a second shaft portion 712 (second outer peripheral portion), a taper portion 713, and a shaft tip portion 714.

  The first shaft portion 711 is located closest to the support frame 100 in the shaft portion 71. The first shaft portion 711 has a predetermined outer diameter. Further, the first shaft portion 711 has a predetermined length in the axial direction of the shaft portion 71 (region S1 in FIG. 3). Further, the peripheral surface of the first shaft portion 711 extends in parallel with the rotation axis RL (FIG. 3) of the drive transmission gear 70.

  The second shaft portion 712 is disposed with an interval in the axial direction with respect to the first shaft portion 711. The second shaft portion 712 has an outer diameter slightly smaller than that of the first shaft portion 711. The second shaft portion 712 has a predetermined length in the axial direction of the shaft portion 71 (region S2 in FIG. 3). Further, the peripheral surface of the second shaft portion 712 extends in parallel with the rotation axis RL (FIG. 3) of the drive transmission gear 70.

  The tapered portion 713 is disposed between the first shaft portion 711 and the second shaft portion 712. The tapered portion 713 is an inclined surface that connects the front edge of the first shaft portion 711 and the rear edge of the second shaft portion 712, and the inclined surface is outward from the first shaft portion 711 toward the second shaft portion 712. Inclined to reduce the diameter.

  The shaft tip portion 714 is a portion located on the opposite side of the shaft portion 71 from the support frame 100. The shaft tip portion 714 is a tip portion of the shaft portion 71. The outer diameter of the shaft tip portion 714 is set slightly smaller than the outer diameter of the second shaft portion 712. Further, a step portion 715 is disposed between the second shaft portion 712 and the shaft tip portion 714. As described above, the shaft front end portion 714 is inserted into the frame hole portion 103 of the opposing frame 102.

  The drive transmission gear 70 includes a cylindrical portion 70A, a gear portion 70B, and an insertion portion 70C.

  The cylindrical portion 70 </ b> A is disposed at the center of the drive transmission gear 70 and extends in the axial direction in the rotation of the drive transmission gear 70. The cylindrical portion 70A extends so as to penetrate the gear portion 70B in the axial direction. An insertion portion 70C described later is arranged inside the cylindrical portion 70A.

  The gear part 70B is disposed around the cylindrical part 70A. The gear part 70B has a substantially disc shape. Although not appearing in FIG. 2 and FIG. 3, a plurality of spur-shaped gear teeth arranged at intervals in the circumferential direction are arranged on the outer peripheral portion of the gear portion 70 </ b> B.

  The insertion portion 70C (FIG. 3) is a space portion formed inside the cylindrical portion 70A. The shaft portion 71 is inserted into the insertion portion 70C.

  Further, the drive transmission gear 70 includes a first inner peripheral portion 701 and a second inner peripheral portion 702.

  The first inner peripheral portion 701 is disposed on the support frame 100 side (one end side) of the insertion portion 70C in the axial direction. The first inner peripheral portion 701 contacts the first shaft portion 711 and is supported by the first shaft portion 711. The first inner peripheral portion 701 extends so as to cover the first shaft portion 711 and the tapered portion 713 along the axial direction. Therefore, as shown in FIG. 3, the first inner peripheral portion 701 extends from the support frame 100 side of the shaft portion 71 to the opposing frame 102 side. Further, the inner peripheral surface of the first inner peripheral portion 701 extends in parallel with the rotation axis RL (FIG. 3) of the drive transmission gear 70.

  The second inner peripheral portion 702 is disposed on the opposite frame 102 side (the other end side) of the insertion portion 70C in the axial direction. The second inner peripheral portion 702 has an inner diameter smaller than that of the first inner peripheral portion 701. The second inner peripheral portion 702 contacts the second shaft portion 712 and is supported by the second shaft portion 712. The second inner peripheral portion 702 is arranged with a step from the end of the first inner peripheral portion 701 on the opposite frame 102 side. Further, the inner peripheral surface of the second inner peripheral portion 702 extends in parallel with the rotation axis RL (FIG. 3) of the drive transmission gear 70.

  As shown in FIG. 3, the drive transmission gear 70 is attached to a shaft portion 71 projecting from the support frame 100. At this time, the cylindrical front end portion 70 </ b> A <b> 1 of the drive transmission gear 70 contacts the frame contact portion 101. The shaft tip portion 714 of the shaft portion 71 passes through the first inner peripheral portion 701 and the second inner peripheral portion 702 of the drive transmission gear 70 and is then inserted into the frame hole portion 103 opened in the opposing frame 102. . At this time, the stepped portion 715 contacts the wall surface of the opposing frame 102.

  The end portion of the first inner peripheral portion 701 on the support frame 100 side is supported by the first shaft portion 711. On the other hand, the second inner peripheral portion 702 is supported by the end of the second shaft portion 712 on the opposite frame 102 side. In other words, the second inner peripheral portion 702 is set shorter than the second shaft portion 712 in the axial direction so that a region adjacent to the tapered portion 713 of the second shaft portion 712 is exposed. The first inner peripheral portion 701 extends along the axial direction so as to cover the exposed regions of the tapered portion 713 and the second shaft portion 712.

  A drive shaft of a motor (not shown) for rotating the paper discharge roller 53 is connected to the gear teeth of the gear portion 70 </ b> B of the drive transmission gear 70. Further, an input gear (not shown) arranged coaxially with the paper discharge roller 53 is similarly connected to the gear teeth of the gear portion 70B of the drive transmission gear 70. The drive shaft and the input gear are disposed at different positions in the circumferential direction of the gear portion 70B and engaged with the gear teeth. Thus, the rotational driving force generated by the motor is transmitted to the paper discharge roller 53 via the drive transmission gear 70 of the drive transmission unit 7.

  Furthermore, in this embodiment, the drive transmission part 7 is provided with the grease storage part 70S (lubricant storage part). As shown in FIG. 3, the grease storage part 70S is a space part formed between the shaft part 71 and the drive transmission gear 70C. Specifically, the grease storage portion 70 </ b> S is formed between the first inner peripheral portion 701 and the tapered portion 713. Furthermore, the grease storage part 70 </ b> S is formed between the first inner peripheral part 701 and the second shaft part 712. The grease storage unit 70S has a function that enables the lubricant to be stored. That is, before the drive transmission gear 70 is attached to the shaft portion 71, a lubricant such as grease is applied in advance to the outer peripheral surface of the shaft portion 71 or the inner peripheral surface of the insertion portion 70C. When the drive transmission gear 70 is attached to the shaft portion 71, the grease is confined in the grease storage portion 70S. The grease storage portion 70S is sealed by the first inner peripheral portion 701 and the first shaft portion 711 on the support frame 100 side. Further, the opposite frame 102 side of the grease storage portion 70 </ b> S is sealed by the second inner peripheral portion 702 and the second shaft portion 712. For this reason, it is difficult for the grease stored in the grease storage section 70 </ b> S to flow out of the drive transmission gear 70. As a result, poor lubrication of the drive transmission gear 70 is prevented, and the drive transmission gear 70 can be stably rotated over a long period of time. At this time, as described above, a portion of the second shaft portion 712 is exposed, and the space between the portion of the second shaft portion 712 and the first inner peripheral portion 701 is utilized to store grease. The portion 70S can be widely provided in the axial direction.

  The drive transmission unit 7 (rotating body support device) and the image forming apparatus 1 including the drive transmission unit 7 according to the embodiment of the present invention have been described above. However, the present invention is not limited to this, and for example, the following Modified embodiments can be employed.

  (1) In the above embodiment, the drive transmission gear 70 that is a rotary gear is described as the rotary body of the rotary body support device. However, the present invention is not limited to this. That is, gear teeth may not be disposed on the outer peripheral portion of the gear portion 70B, and the rotating body may be a pulley that supports a predetermined belt to be rotated. Even in this case, poor lubrication of the pulley can be prevented, and the pulley can be stably rotated over a long period of time.

  (2) In the above-described embodiment, the first inner peripheral portion 701 has been described in an aspect in which the first inner peripheral portion 701 is arranged to face part of the tapered portion 713 and the second shaft portion 712 in the radial direction. It is not limited to. The first inner peripheral portion 701 may be disposed so as to face the first shaft portion 711 and the taper portion 713 in the radial direction and not to face the second shaft portion 712. In other words, the second inner peripheral portion 702 may be in contact with the entire axial direction of the second shaft portion 712. Even in this case, the grease is stored for a long time by the grease storage portion 70S formed between the taper portion 713 and the first inner peripheral portion 701, and the rotation of the drive transmission gear 70 is stably maintained. .

  (3) In the above embodiment, the outer diameter of the tapered portion 713 has been described as being continuously reduced, but the present invention is not limited to this. The tapered portion 713 may be formed with a groove, a concave portion or the like in order to partially increase the grease storage capacity.

  (4) In the above embodiment, the paper discharge roller 53 is used as the rotating body to which the rotational driving force is transmitted from the drive transmission gear 70. However, the present invention is not limited to this. Other transport rollers, rollers such as a developing roller, and a transfer roller may be applied as the rotation target. When the rotating body is the transport roller 53, the transport roller 53 has a function of transporting the sheet, and thus the load applied to the drive transmission gear 70 is relatively small. For this reason, even if the drive transmission gear 70 is configured to be partially supported by the first shaft portion 711 and the second shaft portion 712, the drive transmission gear 70 and the shaft portion 71 are unlikely to be damaged and can be used for a long time. Thus, it becomes possible to transmit the rotational driving force to the transport roller 53 stably.

  (5) In the above embodiment, the image forming apparatus 1 has been described as the electronic apparatus including the rotating body support device. However, the present invention is not limited to this. The present invention may be applied to other electronic devices including a rotating body and a shaft.

1 Image forming device (electronic equipment)
DESCRIPTION OF SYMBOLS 10 Apparatus main body 10R Right side surface 100 Support frame 101 Frame contact part 102 Opposed frame 103 Frame hole part 2 Image reading apparatus 20 Automatic document feeder 25 Reading unit 30 Image forming part 53 Paper discharge roller (rotated body)
7 Drive transmission part 70 Drive transmission gear (rotating body)
701 1st inner peripheral part 702 2nd inner peripheral part 70A Cylindrical part 70A1 Cylindrical tip part 70B Gear part 70C Insertion part 70S Grease storage part (lubricant storage part)
71 Shaft (shaft)
711 First shaft portion (first outer peripheral portion)
712 Second shaft portion (second outer peripheral portion)
713 Tapered portion 714 Shaft tip 715 Stepped portion

Claims (9)

A first outer peripheral portion, a second outer peripheral portion that is disposed at an axial interval with respect to the first outer peripheral portion, and has an outer diameter smaller than that of the first outer peripheral portion; the first outer peripheral portion; A taper portion that is disposed between two outer peripheral portions and has an outer diameter that decreases from the first outer peripheral portion toward the second outer peripheral portion;
A rotating body that includes a cylindrical insertion portion into which the shaft portion is inserted and is rotatably supported by the shaft portion,
The first axial portion is disposed on one end side of the insertion portion in the axial direction, is supported by the first outer peripheral portion, and extends so as to cover the first outer peripheral portion and the tapered portion along the axial direction. The inner periphery,
A second inner peripheral portion disposed on the other end side of the insertion portion in the axial direction, having a smaller inner diameter than the first inner peripheral portion, and supported by the second outer peripheral portion;
A rotating body comprising:
A lubricant reservoir formed between at least the first inner peripheral portion and the tapered portion, and capable of storing a lubricant;
A rotating body support device comprising: The second inner peripheral portion is set shorter than the second outer peripheral portion in the axial direction so that a region adjacent to the tapered portion of the second outer peripheral portion is exposed.
The first inner peripheral portion extends so as to cover the exposed region of the second outer peripheral portion along the axial direction,
2. The rotating body support device according to claim 1, wherein the lubricant reservoir is formed between the first inner peripheral portion, the tapered portion, and the second outer peripheral portion.   The rotating body support device according to claim 1, wherein the rotating body is a rotating gear including a gear portion arranged on the outer side in the circumferential direction from the insertion portion.   The rotating body support device according to claim 1, wherein the rotating body is a pulley that supports a predetermined belt on the outer side in the circumferential direction from the insertion portion. The rotating body support device according to any one of claims 1 to 4,
A rotating body to which a rotational driving force is transmitted from the rotating body;
An electronic device comprising:   The electronic apparatus according to claim 5, wherein the rotated body is a conveyance roller that conveys a sheet. A first outer peripheral portion, a second outer peripheral portion that is disposed at an axial interval with respect to the first outer peripheral portion, and has an outer diameter smaller than that of the first outer peripheral portion; the first outer peripheral portion; A cylindrical insertion portion into which a shaft is inserted, the taper portion being arranged between the first outer peripheral portion and a tapered portion whose outer diameter is reduced from the first outer peripheral portion toward the second outer peripheral portion, A rotating body rotatably supported by a shaft,
The first axial portion is disposed on one end side of the insertion portion in the axial direction, is supported by the first outer peripheral portion, and extends so as to cover the first outer peripheral portion and the tapered portion along the axial direction. The inner periphery,
A second inner peripheral portion disposed on the other end side of the insertion portion in the axial direction, having a smaller inner diameter than the first inner peripheral portion, and supported by the second outer peripheral portion;
With
A rotating body capable of forming a lubricant storing portion in which a lubricant is stored at least between the first inner peripheral portion and the tapered portion. The second inner peripheral portion is set shorter than the second outer peripheral portion in the axial direction so that a region adjacent to the tapered portion of the second outer peripheral portion is exposed.
The rotating body according to claim 7, wherein the first inner peripheral portion extends so as to cover the exposed region of the second outer peripheral portion along the axial direction.   The first outer peripheral portion, the second outer peripheral portion, and the tapered portion are provided, inserted into the insertion portion of the rotating body according to claim 7 or 8, and rotatably support the rotating body. A shaft characterized by that.

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