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US 12,025,927 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoichi Taniguchi
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a plurality of image forming portions; a rotatable endless belt; a plurality of stretching rollers including an inner roller and a steering roller; an outer roller; a steering mechanism; a position changing mechanism; and a controller. In a case that a changing operation for changing a position of the inner roller is performed by the position changing mechanism during execution of a job for forming the toner images on a plurality of recording materials, the controller controls the steering mechanism so that a tilting operation for tilting the steering roller in a predetermined amount in interrelation with the changing operation is executed.
Claims18
An image forming apparatus comprising:
- a plurality of image forming portions configured to form toner images;
- a rotatable endless belt on which the toner images formed by the image forming portions are transferred;
- a plurality of stretching rollers configured to stretch the belt, the stretching rollers including an inner roller configured to form a transfer portion where the toner images are transferred from the belt onto a recording material and a steering roller provided tiltable and capable of changing a position of the belt with respect to a widthwise direction;
- an outer roller configured to form the transfer portion between the outer roller and the inner roller;
- a steering mechanism configured to tilt the steering roller by being driven;
- a position changing mechanism capable of changing a position of the transfer portion with respect to a circumferential direction of the inner roller by changing a position of the inner roller;
- and
- a controller configured to control the steering mechanism,
- wherein in a case that a changing operation for changing the position of the inner roller is performed by the position changing mechanism during execution of a job for forming the toner images on a plurality of recording materials, the controller controls the steering mechanism so that a tilting operation for tilting the steering roller in a predetermined amount in interrelation with the changing operation is executed.
6 more elements
An image forming apparatus comprising:
- a plurality of image forming portions configured to form toner images;
- a rotatable endless belt on which the toner images formed by the image forming portions are transferred;
- a plurality of stretching rollers configured to stretch the belt, the stretching rollers including an inner roller configured to form a transfer portion where the toner images are transferred from the belt onto a recording material, an upstream roller provided on a side upstream of and adjacent to the inner roller with respect to a rotational direction of the belt, and a steering roller provided tiltable and capable of changing a position of the belt with respect to a widthwise direction;
- a steering mechanism configured to tilt the steering roller by being driven;
- a pressing member provided upstream of the inner roller and downstream of the upstream roller with respect to the rotational direction of the belt, the pressing member being contactable to an inner peripheral surface of the belt and being capable of pressing the belt from an inner peripheral surface side toward an outer peripheral surface side of the belt;
- a position changing mechanism capable of changing a position of the pressing member;
- and
- a controller configured to control the steering mechanism,
- wherein in a case that a changing operation for changing the position of the pressing member is performed by the position changing mechanism during execution of a job for forming the toner images on a plurality of recording materials, the controller controls the steering mechanism so that a tilting operation for tilting the steering roller in a predetermined amount in interrelation with the changing operation is executed.
6 more elements
An image forming apparatus comprising:
- a plurality of image forming portions configured to form toner images;
- a rotatable endless belt on which the toner images formed by the image forming portions are transferred;
- a plurality of stretching rollers configured to stretch the belt, the stretching rollers including an inner roller configured to form a transfer portion where the toner images are transferred from the belt onto a recording material and a steering roller provided tiltable and capable of changing a position of the belt with respect to a widthwise direction;
- an outer roller configured to form the transfer portion between the outer roller and the inner roller;
- a steering mechanism configured to tilt the steering roller by being driven;
- a position changing mechanism capable of changing a position of the transfer portion with respect to a circumferential direction of the inner roller by changing a position of the inner roller;
- and
- a controller configured to control the steering mechanism,
- wherein in a case that a changing operation for changing the position of the inner roller is performed by the position changing mechanism during execution of a job for forming the toner images on a plurality of recording materials, the controller controls the steering mechanism so that a predetermined tilting operation for tilting the steering roller in interrelation with the changing operation is executed.
6 more elements
An image forming apparatus comprising:
- a plurality of image forming portions configured to form toner images;
- a rotatable endless belt on which the toner images formed by the image forming portions are transferred;
- a plurality of stretching rollers configured to stretch the belt, the stretching rollers including an inner roller configured to form a transfer portion where the toner images are transferred from the belt onto a recording material, an upstream roller provided on a side upstream of and adjacent to the inner roller with respect to a rotational direction of the belt, and a steering roller provided tiltable and capable of changing a position of the belt with respect to a widthwise direction;
- a steering mechanism configured to tilt the steering roller by being driven;
- a pressing member provided upstream of the inner roller and downstream of the upstream roller with respect to the rotational direction of the belt, the pressing member being contactable to an inner peripheral surface of the belt and being capable of pressing the belt from an inner peripheral surface side toward an outer peripheral surface side of the belt;
- a position changing mechanism capable of changing a position of the pressing member;
- and
- a controller configured to control the steering mechanism,
- wherein in a case that a changing operation for changing the position of the pressing member is performed by the position changing mechanism during execution of a job for forming the toner images on a plurality of recording materials, the controller controls the steering mechanism so that a predetermined tilting operation for tilting the steering roller in interrelation with the changing operation is executed.
6 more elements
Dependencies are inferred from the claim text.