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US 6,769,679 B2Granted
Roller, sheet feed apparatus, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorShigehisa Ishibashi
Life of this patent
Estimating the term…
Abstract
A roller including: an outer peripheral portion coming into contact with a sheet; an inner peripheral portion; and a plurality of connection ribs for connecting the outer peripheral portion and the inner peripheral portion to each other, in which the outer peripheral portion and the inner peripheral portion have a cylindrical configuration and are arranged concentrically, and in which the connection ribs are inclined by a predetermined angle with respect to a straight line radially extending from an axis of the roller.
Claims15
A roller comprising:
- an outer peripheral portion coming into contact with a sheet;
- an inner peripheral portion;
- and
- a plurality of connection ribs for connecting the outer peripheral portion and the inner peripheral portion to each other,
- wherein the outer peripheral portion and the inner peripheral portion have a cylindrical configuration and are arranged concentrically, and
- wherein the connection ribs are inclined by a predetermined angle with respect to a straight line radially extending from an axis of the roller.
3 more elements
A sheet feed apparatus comprising:
- sheet containing means for containing and supporting sheets;
- sheet feeding means for feeding sheets from the sheet containing means;
- and
- a retard separation mechanism for feeding the sheets from the sheet feeding means separately one by one,
- wherein the retard separation mechanism has a feed roller rotating in a direction in which the sheets are fed and a retard roller in press contact with the feed roller and rotating in a direction in which the sheets are returned to the sheet containing means, and
- wherein the retard roller has an outer peripheral portion coming into contact with the sheet, an inner peripheral portion, and a plurality of connection ribs for connecting the outer peripheral portion and the inner peripheral portion to each other, the outer peripheral portion and the inner peripheral portion being of a cylindrical configuration and arranged concentrically, the connection ribs being inclined by a predetermined angle with respect to a straight line extending radially from the axis of the retard roller.
3 more elements
An image forming apparatus comprising:
- sheet containing means for containing and supporting sheets;
- sheet feeding means for feeding sheets from the sheet containing means;
- a retard separation mechanism for feeding the sheets from the sheet feeding means separately one by one;
- and
- image forming means for forming an image on a sheet separated by the retard separation mechanism,
- wherein the retard separation mechanism has a feed roller rotating in a direction in which the sheets are fed and a retard roller in press contact with the feed roller and rotating in a direction in which the sheets are returned to the sheet containing means, and
- wherein the retard roller has an outer peripheral portion coming into contact with the sheet, an inner peripheral portion, and a plurality of connection ribs for connecting the outer peripheral portion and the inner peripheral portion to each other, the outer peripheral portion and the inner peripheral portion being of a cylindrical configuration and arranged concentrically, the connection ribs being inclined by a predetermined angle with respect to a straight line extending radially from the axis of the retard roller.
4 more elements
Dependencies are inferred from the claim text.