Back to results
US 5,458,324 AGranted
Pressure-sensitive and electrically-conductive roller
AssigneeKabushiki Kaisha Toshiba
InventorsHajime Nakamura, Jun Sakakibara
Life of this patent
Estimating the term…
Abstract
It is an object of this invention to allow detection of multiple paper-conveying of an original sheet in image reading or forming operation and facilitate a recovery operation. An automatic original feeding apparatus of this invention uses pressure sensitive conductive rubber in a feeding roller, and changes in length and thickness of a sheet are changed into electrical signals, so that the conveyed state such as multiple paper-conveying of the sheet can be detected.
Claims31
A paper sheet feeding apparatus comprising:
- a table for placing a plurality of paper sheets;
- means for feeding the paper sheets placed on said table;
- a pressure-sensitive and electrically-conductive member being allowed to be pressed with a given pressure to the paper sheet fed by said feeding means;
- means for generating an electrical signal representing a pressure condition of said pressure-sensitive and electrically-conductive member pressed to the paper sheet;
- and
- means for detecting that two or more of the paper sheets are simultaneously fed by said feeding means, in accordance with the electrical signal from said generating means;
- wherein said pressure-sensitive and electrically-conductive member includes:
- a roller being formed of a pressure-sensitive and electrically-conductive rubber having an electrical resistance value which varies depending on a pressure applied to the rubber, and
- an electrical conductive material provided outside of said roller,
- and wherein said generating means includes:
- first detecting means, coupled to said electrical conductive material, for detecting a change in the resistance value of said pressure-sensitive and electrically-conductive rubber to provide resistance change information, and
- second detecting means for detecting that two or more of the paper sheets are simultaneously fed by said feeding means, in accordance with the resistance change information provided by said first detecting means.
9 more elements
A paper sheet feeding apparatus comprising:
- a table for placing a plurality of paper sheets;
- means for feeding the paper sheets placed on said table;
- a pressure-sensitive and electrically-conductive member being allowed to be pressed with a given pressure to the paper sheet fed by said feeding means;
- means for generating an electrical signal representing a pressure condition of said pressure-sensitive and electrically-conductive member pressed to the paper sheet;
- and
- means for detecting that two or more of the paper sheets are simultaneously fed by said feeding means, in accordance with the electrical signal from said generating means;
- wherein said pressure-sensitive and electrically-conductive member includes a roller having a pressure-sensitive and electrically-conductive rubber, said roller being pressed to the paper sheet so that a rotation of said roller feeds the paper sheet.
4 more elements
A paper sheet feeding apparatus comprising:
- a table for placing a plurality of paper sheets;
- means for feeding the paper sheets placed on said table;
- a roller having pressure-sensitive and electrically-conductive rubber being allowed to be pressed with a given pressure to the paper sheet which is fed by said feeding means;
- means for separately generating, with a given time interval, electrical signals each representing a pressure condition of said roller pressed to the paper sheet;
- and
- means for detecting an inclination of the paper sheet with respect to a direction of feeding the paper sheet fed by said feeding means, in accordance with a change in contents of the electrical signals generated by said generating means with respect to passage of time.
3 more elements
Dependencies are inferred from the claim text.