Drive transmission device and image forming apparatus incorporating the drive transmission device

Patent metadata

Field	Value
Publication number	US-10429786-B2
Application number	US-201816033429-A
Country	US
Kind code	B2
Filing date	Jul 12, 2018
Priority date	Jul 14, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A drive transmission device, which is included in an image forming apparatus, includes a drive transmission body to which a drive force is applied from a driving source, and a rotary shaft having a press-in portion mounted on one end thereof in the axial direction. The press-in portion has multiple planes disposed parallel to an axial direction and configured to receive the drive transmission body. The multiple planes include upstream and downstream side planes disposed downstream from the upstream side plane in a press-in direction of the drive transmission body. The upstream and downstream side planes are aligned along the press-in direction of the drive transmission body and have respective distances different from each other from an axial center of the rotary shaft. A distance from the downstream side plane to the axial center is greater than a distance from the upstream side plane to the axial center.

First claim

What is claimed is:

1. A drive transmission device comprising:
a drive transmission body to which a drive force is applied from a drive source; and
a rotary shaft having a press-in portion mounted on one end thereof in an axial direction, the press-in portion having multiple planes disposed parallel to the axial direction and configured to receive the drive transmission body,
the multiple planes including an upstream side plane and a downstream side plane disposed downstream from the upstream side plane in a press-in direction of the drive transmission body, the upstream side plane and the downstream side plane being aligned along the press-in direction of the drive transmission body and having respective distances different from each other from an axial center of the rotary shaft,
a distance from the downstream side plane to the axial center being greater than a distance from the upstream side plane to the axial center.

2. The drive transmission device according to claim 1 ,
wherein the press-in portion further includes a sloped face connecting the upstream side plane and the downstream side plane.

3. The drive transmission device according to claim 1 ,
wherein the drive transmission body includes a press-in opening configured to be pressed to the press-in portion of the rotary shaft,
wherein the press-in opening has an inner circumferential surface having multiple inner circumferential planes, and
wherein the multiple inner circumferential planes are pressed to the multiple plane of the press-in portion.

4. The drive transmission device according to claim 3 ,
wherein, out of the multiple inner circumferential planes, the distance from the downstream side plane to the axial center is greater than the distance from the upstream side plane to the axial center.

5. The drive transmission device according to claim 1 ,
wherein the drive transmission body includes a press-in opening configured to be pressed to the press-in portion of the rotary shaft, and
wherein the press-in opening has a non-contact portion in which the drive transmission body does not contact the press-in portion.

6. The drive transmission device according to claim 1 ,
wherein the driving force is transmitted to a drive target body configured to a moving body against a biasing body.

7. The drive transmission device according to claim 6 , further comprising:
a drive side coupling configured to receive the driving force from the drive source;
a driven side coupling configured to engage with the drive side coupling; and
a torque limiter configured to couple the drive side coupling and the driven side coupling while driving.

8. The drive transmission device according to claim 6 ,
wherein the moving body is a pressure roller configured to press a fixing roller.

9. The drive transmission device according to claim 1 , further comprising at least one spur gear.

10. The drive transmission device according to claim 1 , further comprising:
multiple pulleys; and
a belt wound around the multiple pulleys,
wherein one of the multiple pulleys is mounted on a shaft of a drive target body to which the driving force is transmitted from the drive source via the belt,
wherein the rotary shaft is the shaft of the drive target body, and
wherein the drive transmission body is a pulley of the multiple pulleys, the pulley being mounted on the shaft of the drive target body.

11. The drive transmission device according to claim 10 ,
wherein the drive target body is a sheet output roller.

12. An image forming apparatus comprising:
an image forming device configured to form an image on a recording medium; and
the drive transmission device according to claim 1 , configured to transmit the driving force applied by the drive source to a drive target body.

Assignees

• Tomita Kenji
• Kamichi Junpei
• Nieda Hiroaki
• Tanaka Kimihiro
• Higaki Hideto
• Shiga Yuuki
• Aoyama Jumpei
• Horita Hirofumi
• Ricoh Co Ltd

Inventors

• Tomita Kenji
• Kamichi Junpei
• Nieda Hiroaki
• Tanaka Kimihiro
• Higaki Hideto
• Shiga Yuuki
• Aoyama Jumpei
• Horita Hirofumi

Classifications

• G03G21/1647

  Mechanical connection means · CPC title

• G03G21/1685

  for the fixing unit · CPC title

• G03G15/2053

  Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating · CPC title

• G03G15/2064 Primary

  combined with pressure · CPC title

• G03G15/2032

  Retractable heating or pressure unit · CPC title