Document sensor and sensing method
AssigneeUmax Data Systems Inc.
InventorsYin-Chun Huang, Pi-Chun Chen, Ji-Mei Tsuei
Life of this patent
Estimating the term…
Abstract
A sensor for detecting the entrance of a document into a sheet feeder. The document sensor is attached to the sheet feeder. The document sensor comprises a printed circuit board, a key peg and a rocking lever. The printed circuit board is attached to the sheet feeder. The printed circuit board has a first lead wire and a second lead wire detached form each other. The key peg is also attached to the sheet feeder pinning the rocking lever so that the rocking lever is free to rotate relative to the key peg. A conductive member is attached to the rocking lever so that rotating the rocking lever is able to establish an electrical connection between the first lead wire and the second lead wire through the conductive member.
Claims19
A document sensor attached to a sheet feeder for sensing the presence of a document, comprising:
- a first lead wire;
- a second lead wire electrically separated from the second lead wire;
- a key peg attached to the sheet feeder;
- and
- a rocking lever pinned by the key peg such that the rocking lever is free to rotate using the key peg as a pivot, and the first lead wire and the second lead wire can be electrically connected through a rotation of the rocking lever.
A document sensor attached to a sheet feeder for sensing the presence of a document, comprising:
- at least a lead wire;
- and
- a driven element capable of selectively electrical connecting to the lead wire, so as to judge whether or not the document has entered the sheet feeder.
A method of sensing the entrance of a document into a sheet feeder, comprising the steps of:
- providing a document sensor and attaching the document sensor to the sheet feeder, wherein the document sensor includes:
- at least a lead wire;
- and
- a driven element for connecting the lead wire electrically;
- feeding a document into the sheet feeder, pushing the driven element such that the driven element is separated from the lead wire, so as to judge whether or not the document has entered the sheet feeder;
- and
- removing the document from the sheet feeder, whereby the lead is electrically connected to the driven element, so as to judge whether or not the document has entered the sheet feeder.
A sensing method for detecting the entrance of a document into a sheet feeder, comprising the steps of:
- providing a document sensor and attaching the sensor to the sheet feeder, wherein the sensor comprising:
- at least a lead wire;
- and
- a driven element, which is separated from the lead wire;
- feeding a document into the sheet feeder, pushing the driven element such that the driven element is electrically connected to the lead wire, so as to judge whether or not the document has entered the sheet feeder;
- and
- removing the document from the sheet feeder, whereby the lead is separated from the driven element, so as to judge whether or not the document has entered the sheet feeder.
Dependencies are inferred from the claim text.