Back to results
US 10,947,072 B2Granted
Belt conveying device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakao Nakajima
Life of this patent
Estimating the term…
Abstract
An inadvertent swing of a steering roller is restricted with a versatile configuration. A belt conveying device includes a belt member configured to be stretched around a steering roller and a roller member, and a movement mechanism configured to move the roller member. The roller member is movable to a first position and a second position where the roller member is moved further inward on an inner peripheral side of the belt member than the first position by the movement mechanism. In the movement mechanism, a restriction portion capable of restricting a swinging range of the steering roller more in a case where the roller member is at the second position than in a case where the roller member is at the first position is provided.
Claims19
A belt unit attachable to and detachable from an image forming apparatus comprising:
- an endless belt;
- a steering mechanism including a first roller around which the belt is stretched, the steering mechanism capable of swinging the first roller about a swing axis intersecting an axial direction of the first roller;
- a second roller around which the belt is stretched, and movable to a first position and a second position;
- a frame configured to movably support the second roller;
- and
- a movement mechanism provided to be movable relative to the frame and configured to move the second roller,
- wherein the movement mechanism includes a restriction portion configured to restrict a swing of the first roller, and in a case where the second roller is at the first position, the first roller is provided to be swingable in a first predetermined range, and in a case where the second roller is at the second position, the restriction portion restricts the swing of the first roller within a second predetermined range smaller than the first predetermined range by contacting the steering mechanism.
4 more elements
A belt unit attachable to and detachable from an image forming apparatus comprising:
- a rotatable belt;
- a transfer roller configured to transfer a toner image onto the belt;
- a steering mechanism comprising:
- a steering roller being rotatably supported and configured to stretch the belt;
- receiving members which are contactable with the belt and provided at both ends of the steering roller, the receiving members receive force from the belt when contacted with the belt;
- and
- a supporting member configured to inclinably support the steering roller and the receiving members,
- wherein, in a case where the belt deviates to either one side in the width direction of the belt, the steering mechanism makes the steering roller incline in a direction to make the belt to move toward the other side in the width direction of the belt according to the force received by the receiving members from the belt;
- and
- a stretching roller configured to stretch the belt,
- wherein the stretching roller is rotatably provided downstream of the steering roller and upstream of the transfer roller in the rotational direction of the belt;
- and
- a moving mechanism to move the stretching roller by being transmitted with a driving force,
- wherein the moving mechanism is configured to move the stretching roller to a first position when forming an image, and to a second position when detaching the belt unit from the image forming apparatus,
- wherein the moving mechanism includes a restriction portion configured to restrict a position of the steering mechanism and when the stretching roller is at the first position, the restriction portion is outside a movable range of the steering mechanism when the belt is driven, and abuts to the steering mechanism when positioning at the second position.
12 more elements
A belt unit attachable to and detachable from an image forming apparatus comprising:
- a rotatable belt;
- a transfer roller configured to transfer a toner image onto the belt;
- a steering mechanism comprising:
- a steering roller being rotatably supported and configured to stretch the belt;
- receiving members which are contactable with the belt and provided at both ends of the steering roller, the receiving members receive force from the belt when contacted with the belt;
- and
- a supporting member configured to inclinably support the steering roller and the receiving members,
- wherein, in a case where the belt deviates to either one side in the width direction of the belt, the steering mechanism makes the steering roller incline in a direction to make the belt to move toward the other side in the width direction of the belt according to the force applied by the belt and received by the receiving members;
- a stretching roller configured to stretch the belt,
- wherein the stretching roller is rotatable and stretches the belt at the position downstream of the steering roller and upstream of the transfer roller in the rotational direction of the belt;
- and
- a moving mechanism configured to move the stretching roller to a first position when forming an image, and to a second position when detaching the belt unit from the image forming apparatus by being transmitted with a driving force,
- wherein the moving mechanism includes a restriction portion configured to restrict a position of the steering mechanism,
- when the moving mechanism is at the first position, the restriction portion is outside a movable range of the steering mechanism when the belt is driven, and when the moving mechanism is at the second position, the restriction portion regulates the movable range of the steering mechanism when the driving of the belt is stopped.
11 more elements
Dependencies are inferred from the claim text.