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US 10,120,320 B2Granted
Sheet transport device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorDaisuke Yamabe
Life of this patent
Estimating the term…
Abstract
A sheet transport device includes a transport unit that transports a sheet, an endless belt that transmits a driving force from a motor to the transport unit, a rotary member that rotates by being pressed by the sheet transported by the transport unit, and a sensor that generates a signal in accordance with rotation of the rotary member. The rotary member is arranged in such a manner that a portion of the rotary member faces an inner peripheral portion of the endless belt.
Claims12
A sheet transport device comprising:
- a transport rotary unit that transports a sheet in a transporting direction by rotating;
- a rotary member that rotates by being pressed by the sheet transported by the transport rotary unit;
- a photo-interrupter that generates a signal in accordance with rotation of the rotary member;
- and
- an endless belt that transmits a driving force from a motor to the transport rotary unit,
- wherein the rotary member includes
- a shaft extending in an axial direction of the rotary member,
- a contact portion that projects from the shaft and that is brought into contact with the sheet transported, and
- a light-blocking portion that blocks an optical path of the photo-interrupter,
- wherein the contact portion and the light-blocking portion are arranged in such a manner that the endless belt is interposed between the contact portion and the light-blocking portion in the axial direction of the rotary member, and
- wherein the rotary member is arranged in such a manner that part of the shaft of the rotary member is surrounded by the endless belt.
8 more elements
A sheet transport device comprising:
- a transporting roller that includes
- a roller shaft, and
- a receiving portion configured to receive a rotating force from a motor and provided at an end portion of the roller shaft in an axial direction of the transporting roller,
- wherein the transporting roller transports a sheet in a transporting direction perpendicular to the axial direction by the rotating force received by the receiving portion;
- a transmission unit that transmits the rotating force from the motor to the receiving portion;
- a rotary member that rotates by being pressed by the sheet transported;
- and
- a photo-interrupter that generates a signal,
- wherein the rotary member includes
- a contact portion that is brought into contact with the sheet transported,
- a light-blocking portion that blocks an optical path of the photo-interrupter, and
- a shaft that connects the contact portion and the light-blocking portion,
- wherein the transmission unit includes
- a pulley, and
- a ring-shaped belt supported by the pulley,
- wherein the contact portion and the light-blocking portion are arranged in such a manner that the ring-shaped belt is interposed between the contact portion and the light-blocking portion in the axial direction,
- wherein the ring-shaped belt is arranged outside of a transport region in the axial direction, and the transporting roller transports the sheet in the transport region, and
- wherein the shaft of the rotary member is disposed inside a ring formed of the ring-shaped belt.
15 more elements
An image forming apparatus comprising:
- a transport rotary unit that transports a sheet in a transporting direction by rotating;
- an image forming unit that forms an image on the sheet, which is transported by the transport rotary unit;
- a rotary member that rotates by being pressed by the sheet, which is transported by the transport unit;
- a photo-interrupter that generates a signal in accordance with rotation of the rotary member;
- and
- an endless belt that transmits a driving force from a motor to the transport rotary unit,
- wherein the rotary member includes
- a shaft extending in an axial direction of the rotary member,
- a contact portion that projects from the shaft and that is brought into contact with the sheet transported, and
- a light-blocking portion that blocks an optical path of the photo-interrupter,
- wherein the contact portion and the light-blocking portion are arranged in such a manner that the endless belt is interposed between the contact portion and the light-blocking portion in the axial direction of the rotary member, and
- wherein the rotary member is arranged in such a manner that part of the shaft of the rotary member is surrounded by the endless belt.
9 more elements
A sheet transport device comprising:
- a transport rotary unit that transports a sheet in a transporting direction by rotating;
- a rotary member that rotates by being pressed by the sheet transported by the transport rotary unit;
- a photo-interrupter that generates a signal in accordance with rotation of the rotary member;
- and
- a ring-shaped belt that transmits a driving force from a motor to the transport rotary unit,
- wherein the rotary member includes
- a shaft extending in an axial direction of the rotary member,
- a contact portion that projects from the shaft and that is brought into contact with the sheet transported, and
- a light-blocking portion that blocks an optical path of the photointerrupter,
- wherein the contact portion and the light-blocking portion are arranged in such a manner that the ring-shaped belt is interposed between the contact portion and the light-blocking portion in the axial direction of the rotary member, and
- wherein the shaft of the rotary member is disposed inside a ring formed of the ring-shaped belt.
8 more elements
Dependencies are inferred from the claim text.