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US 6,155,557 AGranted
Sheet feeding device
AssigneeRicoh Company, Ltd.
InventorNobutaka Suzuki
Life of this patent
Estimating the term…
Abstract
A member for feeding sheets is provided with a core and a cover mounted on the core. The cover is made of a conductive material or one whose coefficient of friction is lower than that of the sheets.
Claims15
A member for feeding sheets, comprising:
- a core;
- a cylindrical surface formed on said core so as to be rotatable, said cylindrical surface being made of a material whose coefficient of friction is higher than that of sheets to be fed;
- and
- a cover member made of a material whose coefficient of friction is lower than that of the sheets to be fed, said cover member comprising a fan-shaped portion curved to extend along said cylindrical surface.
1 more element
A member for feeding sheets, comprising:
- a core having a rotatable surface, wherein a surface portion which is less than an entirety of said surface, is made of a conductive material.
A member for feeding sheets, comprising:
- a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of sheets to be fed;
- and
- a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a material whose coefficient of friction is lower than that of the sheets to be fed.
A member for feeding sheets, comprising:
- a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of sheets to be fed;
- and
- a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a conductive material whose coefficient of friction is lower than that of the sheets to be fed.
A sheet feeding device comprising:
- a cassette to hold a stack of sheets;
- a sheet feed member mounted so as to feed sheets one by one from said cassette, said sheet feed member including a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of the sheets to be fed, and a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a material whose coefficient of friction is lower than that of the sheets to be fed;
- and
- a friction member mounted so as to be pressed against said sheet feed member.
1 more element
A sheet feeding device comprising:
- a cassette to hold a stack of sheets;
- a sheet feed member mounted so as to feed sheets one by one from said cassette, said sheet feed member including a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of the sheets to be fed, and a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a conductive material whose coefficient of friction is lower than that of the sheets to be fed;
- and
- a friction member mounted so as to be pressed against said sheet feed member.
1 more element
An image forming apparatus including a sheet feeding device comprising:
- a cassette to hold a stack of sheets;
- a sheet feed member mounted so as to feed sheets one by one from said cassette, said sheet feed member including a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of the sheets to be fed, and a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a material whose coefficient of friction is lower than that of the sheets to be fed;
- and
- a friction member mounted so as to be pressed against said sheet feed member.
1 more element
An image forming apparatus including a sheet feeding device comprising:
- a cassette to hold a stack of sheets;
- a sheet feed member mounted so as to feed sheets one by one from said cassette, said sheet feed member including a core comprising a roller having a peripheral surface whose coefficient of friction is higher than that of the sheets to be fed, and a cover member mounted to said core such that said cover member substantially coincides with a circumferential portion of the peripheral surface of said roller, wherein said cover member is made of a conductive material whose coefficient of friction is lower than that of the sheets to be fed;
- and
- a friction member mounted so as to be pressed against said sheet feed member.
1 more element
A member for feeding sheets, comprising:
- a core;
- and
- a surface portion formed on said core so as to be rotatable, at least one portion of the circumferential extent said surface portion being made of a conductive material whose coefficient of friction is lower than that of sheets to be fed and at least another portion of the circumferential extent said surface portion being made of a non-conductive material whose coefficient of friction is higher than that of the sheets.
Dependencies are inferred from the claim text.