Paper carrying device, document scanning apparatus, and printing apparatus that detects error of sensor output signal
AssigneeSharp Kabushiki Kaisha
InventorSatoshi Morimoto
Life of this patent
Estimating the term…
Abstract
A paper carrying device includes a carrying path, a light sensor, a contact sensor, and a judgment section. Both of the light sensor and the contact sensor output a presence-signal indicating that paper exists at a predetermined position in the carrying path or an absence-signal indicating that paper does not exist at the predetermined position. The judgment section judges that a signal output from the light sensor is an error when the light sensor outputs the presence-signal while the contact sensor outputs the absence-signal.
Claims12
A paper carrying device, comprising:
- a carrying path via which paper is carried;
- a light sensor for (i) emitting light to a predetermined position in the carrying path, (ii) receiving light from the predetermined position, and (iii) outputting, in accordance with an amount of the received light, a presence-signal indicating that the paper exists at the predetermined position or an absence-signal indicating that the paper does not exist at the predetermined position;
- a contact sensor, including a contacting member positioned at the predetermined position, for outputting the presence-signal when the paper contacts the contacting member and outputting the absence-signal when the paper does not contact the contacting member;
- and
- a judgment section for judging that a signal output from the light sensor is an error, when the light sensor outputs the presence-signal while the contact sensor outputs the absence-signal.
A document scanning apparatus, comprising:
- a carrying path via which a document is carried;
- a light sensor for (i) emitting light to a predetermined position in the carrying path, (ii) receiving light from the predetermined position, and (iii) outputting, in accordance with an amount of the received light, a presence-signal indicating that the document exists at the predetermined position or an absence-signal indicating that the document does not exist at the predetermined position;
- a contact sensor, including a contacting member positioned at the predetermined position, for outputting the presence-signal when the document contacts the contacting member and outputting the absence-signal when the document does not contact the contacting member;
- and
- a judgment section for judging that a signal output from the light sensor is an error, when the light sensor outputs the presence-signal while the contact sensor outputs the absence-signal.
A printing apparatus, comprising:
- a carrying path via which printing paper is carried;
- a light sensor for (i) emitting light to a predetermined position in the carrying path, (ii) receiving light from the predetermined position, and (iii) outputting, in accordance with an amount of the received light, a presence-signal indicating that the printing paper exists at the predetermined position or an absence-signal indicating that the printing paper does not exist at the predetermined position;
- a contact sensor, including a contacting member positioned at the predetermined position, for outputting the presence-signal when the printing paper contacts the contacting member and outputting the absence-signal when the printing paper does not contact the contacting member;
- and
- a judgment section for judging that a signal output from the light sensor is an error, when the light sensor outputs the presence-signal while the contact sensor outputs the absence-signal.
Dependencies are inferred from the claim text.