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US 7,921,987 B2Granted
Belt drive device and image forming apparatus
AssigneeOki Data Corporation
InventorMakoto Kitamura
Life of this patent
Estimating the term…
Abstract
A belt drive device includes a plurality of rollers and an endless belt stretched around the rollers, and configured to drive the endless belt by rotating the rollers. The belt drive device further includes a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of the above described rollers in accordance with the movement of the endless belt in the axial direction of the roller.
Claims18
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction that is substantially perpendicular to an axial direction of said roller and substantially perpendicular to a stretching direction in which said endless belt is stretched, in accordance with a movement of said endless belt in said axial direction of said roller,
- wherein, by said movement of said endless belt in said axial direction of said roller, said endless belt pushes said roller-shaft shifting member to cause said roller-shaft shifting member to move in a direction to shift said shaft of said roller in said direction perpendicular to said axial direction and perpendicular to said stretching direction.
2 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction that is substantially perpendicular to an axial direction of said roller and substantially perpendicular to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in said axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said direction substantially perpendicular to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller,
- the belt drive device further comprising:
- a belt frame that supports said roller;
- and
- a tilted part provided on said belt frame, said tilted part being tilted with respect to the axial direction of said roller,
- wherein said roller-shaft shifting member has a rotation axis substantially perpendicular to the axial direction of said shaft of said roller, and said roller-shaft shifting member rotates about said rotation axis and also moves in the direction of said rotation axis along said tilted part.
7 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction that is substantially perpendicular to an axial direction of said roller and substantially perpendicular to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in said axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said direction substantially perpendicular to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller, and
- wherein said roller-shaft shifting member contacts a lateral end of said endless belt.
3 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction that is substantially perpendicular to an axial direction of said roller and substantially perpendicular to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in said axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said direction substantially perpendicular to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller, and
- wherein two roller-shaft shifting members are provided on both ends of said shaft of said roller.
3 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction that is substantially perpendicular to an axial direction of said roller and substantially perpendicular to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in said axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said direction substantially perpendicular to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller, and
- wherein said roller-shaft shifting member has a rotation axis tilted with respect to the axial direction of said roller, and rotates about said rotation axis to shift said shaft of said roller, and
- wherein said roller-shaft shifting member rotates about said rotation axis, in accordance with the movement of said endless belt in the axial direction of said roller.
4 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a rotational direction about an axis substantially parallel to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said rotational direction about said axis substantially parallel to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller,
- wherein said roller-shaft shifting member has a rotation axis tilted with respect to the axial direction of said roller, and rotates about said rotation axis to shift said shaft of said roller,
- wherein said roller-shaft shifting member rotates about said rotation axis, in accordance with the movement of said endless belt in the axial direction of said roller,
- wherein the belt drive device further comprises an axial movement detection member provided coaxially with said roller, said axial movement detection member contacting a lateral end of said endless belt to detect the movement of said endless belt in the axial direction of said roller,
- wherein said roller-shaft shifting member shifts said shaft of said roller in accordance with the position of said axial movement detection member, and
- wherein said roller-shaft shifting member has a convex portion contacting said axial movement detection member.
7 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a rotational direction about an axis substantially parallel to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller,
- wherein said roller-shaft shifting member moves in the axial direction of said roller and also moves in said rotational direction about said axis substantially parallel to said direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller, so as to shift said shaft of said roller,
- wherein said roller-shaft shifting member has a rotation axis tilted with respect to the axial direction of said roller, and rotates about said rotation axis to shift said shaft of said roller,
- wherein said roller-shaft shifting member rotates about said rotation axis, in accordance with the movement of said endless belt in the axial direction of said roller,
- wherein the belt drive device further comprises an axial movement detection member provided coaxially with said roller, said axial movement detection member contacting a lateral end of said endless belt to detect the movement of said endless belt in the axial direction of said roller,
- wherein said roller-shaft shifting member shifts said shaft of said roller in accordance with the position of said axial movement detection member,
- wherein said roller-shaft shifting member has a convex portion contacting said axial movement detection member, and
- wherein a plurality of said convex portions are arranged in a direction substantially perpendicular to said direction in which said endless belt is stretched.
8 more elements
A belt drive device comprising:
- a plurality of rollers;
- an endless belt stretched around said rollers and driven by said rollers;
- and
- a roller-shaft shifting member that shifts at least one end of a shaft of at least one roller of said plurality of rollers in a direction substantially perpendicular to a direction in which said endless belt is stretched, in accordance with the movement of said endless belt in the axial direction of said roller,
- wherein, when said direction in which said roller-shaft shifting member shifts said at least one end of said shaft is defined as a roller-shaft-shifting direction, and when said direction in which said endless belt is stretched is defined as a belt-stretch direction, said roller-shaft-shifting direction is a direction on a cross section of said roller that is formed by cutting said roller in the axial direction of said roller, said cross section of said roller being perpendicular to said belt-stretch direction, said roller-shaft-shifting direction on said cross section of said roller being an upward direction or a downward direction with respect to an axis of said roller.
2 more elements
Dependencies are inferred from the claim text.