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US 5,996,990 AGranted
Sheet feeding apparatus
AssigneeRicoh Company, Ltd.
InventorYasuhiro Kawashima
Life of this patent
Estimating the term…
Abstract
A sheet feeding apparatus which includes a sheet holder holding at least one sheet to be fed. A pick-up roller feeds the at least one sheet from the sheet holder in a sheet feeding direction. A separating roller is provided at a lower reach of the pick-up roller. This separating roller receives a reverse torque in an opposite direction of the sheet feeding direction through a torque limiter. A feeding roller is provided opposite the separating roller and feeds the at least one sheet from the pick-up roller in the sheet feeding direction. Further, a frictional element is provided to increase a rotational load of the separating roller.
Claims23
A sheet feeding apparatus comprising:
- a sheet holder holding at least one sheet to be fed;
- a pick-up roller feeding the at least one sheet to be fed from said sheet holder in a sheet feeding direction;
- a separating roller provided at a lower reach of said pick-up roller, which receives a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter;
- a feeding roller provided opposite said separating roller feeding the at least one sheet from said pick-up roller in the sheet feeding direction;
- and
- a frictional element increasing a rotational load of said separating roller and having an elastic power which acts as a vertical reaction to an outer surface of said torque limiter.
3 more elements
A sheet feeding apparatus comprising:
- a sheet holding means for holding at least one sheet to be fed;
- a pick-up roller means for feeding the at least one sheet to be fed from said sheet holding means in a sheet feeding direction;
- a separating roller means provided at a lower reach of said pick-up roller means, for receiving a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter means;
- a feeding roller means provided opposite said separating roller means for feeding the at least one sheet from said pick-up roller means in the sheet feeding direction;
- and
- a frictional means for increasing a rotational load of said separating roller means and having an elastic power which acts as a vertical reaction to an outer surface of said torque limiter.
3 more elements
A sheet feeding apparatus comprising:
- a sheet holder holding at least one sheet to be fed;
- a pick-up roller feeding the at least one sheet to be fed from said sheet holder in a sheet feeding direction;
- a separating roller provided at a lower reach of said pick-up roller, which receives a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter;
- a feeding roller provided opposite said separating roller feeding the at least one sheet from said pick-up roller in the sheet feeding direction;
- and
- a frictional element increasing a rotational load of said separating roller,
- wherein said frictional element contacts at least one of the separating roller or an element rotating with the separating roller to increase the rotational load on the separating roller, and
- wherein said frictional element comprises a friction part fixed on an elastic plate, and wherein the elastic plate pushes the frictional part on at least a portion of the separating roller on the element rotating with the separating roller through an elasticity of the elastic plate.
5 more elements
A sheet feeding apparatus comprising:
- a sheet holder holding at least one sheet to be fed;
- a pick-up roller feeding the at least one sheet to be fed from said sheet holder in a sheet feeding direction;
- a separating roller provided at a lower reach of said pick-up roller, which receives a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter;
- a feeding roller provided opposite said separating roller feeding the at least one sheet from said pick-up roller in the sheet feeding direction;
- and
- a frictional element increasing a rotational load of said separating roller,
- wherein said frictional element contacts at least one of the separating roller or an element rotating with the separating roller to increase the rotational load on the separating roller, and
- wherein said frictional element comprises a frictional layer and an elastic layer supporting the frictional layer, the elastic layer pushing the frictional layer on at least a part of the separating roller or the element rotating with the separating roller through an elasticity of the elastic layer.
5 more elements
A sheet feeding apparatus comprising:
- a sheet holding means for holding at least one sheet to be fed;
- a pick-up roller means for feeding the at least one sheet to be fed from said sheet holding means in a sheet feeding direction;
- a separating roller means provided at a lower reach of said pick-up roller means, for receiving a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter means;
- a feeding roller means provided opposite said separating roller means for feeding the at least one sheet from said pick-up roller means in the sheet feeding direction;
- and
- a frictional means for increasing a rotational load of said separating roller means,
- wherein said frictional means contacts at least one of the separating roller means or a means rotating with the separating roller to increase the rotational load on the separating roller means, and
- wherein said frictional means comprises a frictional part means fixed to an elastic plate means, and wherein the elastic plate means pushes the frictional part means on at least a portion of the separating roller means or the means rotating with the separating roller means through an elasticity of the elastic plate means.
5 more elements
A sheet feeding apparatus comprising:
- a sheet holding means for holding at least one sheet to be fed;
- a pick-up roller means for feeding the at least one sheet to be fed from said sheet holding means in a sheet feeding direction;
- a separating roller means provided at a lower reach of said pick-up roller means, for receiving a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter means;
- a feeding roller means provided opposite said separating roller means for feeding the at least one sheet from said pick-up roller means in the sheet feeding direction;
- and
- a frictional means for increasing a rotational load of said separating roller means,
- wherein said frictional means contacts at least one of the separating roller means or a means rotating with the separating roller to increase the rotational load on the separating roller means, and
- wherein said frictional means comprises a frictional layer and an elastic layer supporting the frictional layer, the elastic layer pushing the frictional layer on at least a part of the separating roller means or the means rotating with the separating roller means through an elasticity of the elastic layer.
5 more elements
A sheet feeding apparatus comprising:
- a sheet holder holding at least one sheet to be fed;
- a pick-up roller feeding the at least one sheet to be fed from said sheet holder in a sheet feeding direction;
- a separating roller provided at a lower reach of said pick-up roller, which receives a reverse torque in an opposite direction of said sheet feeding direction through a torque limiter;
- a feeding roller provided opposite said separating roller feeding the at least one sheet from said pick-up roller in the sheet feeding direction;
- and
- a frictional element for producing friction to said separating roller so that vibration generated by repeated switching action of said separating roller is reduced.
3 more elements
Dependencies are inferred from the claim text.