Browse Prior Art Database

COPY SHEET MAPPING SENSOR

IP.com Disclosure Number: IPCOM000026469D
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 120K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a low cost thermal ink jet marking system, designed for home and office use, it is necessary to inexpensively determine the location of a sheet of paper that may be manually placed in the system for printing thereon. For example, such a system may include a fixed platen, 18, and a moving printhead, 14, similar to that illustrated by the figure. In operation printhead 14 is rigidly connected to the fast-scan carriage 12, which is slideably connected to alignment rails 16. Movement of the fast-scan carriage in the direction indicated by arrow X is accomplished by sliding the carriage along the rails using a commonly known drive belt, drive wire, or lead screw mechanism (not shown). Displacement in the direction indicated by arrow Y is achieved by moving the alignment rails in a similar fashion. During printing, it is desirable to avoid printing beyond the edges of the sheet or stock, due to problems associated with smearing or smudging of ink deposited on metal platen 18.

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XEROX DISCLOSURE JOURNAL

COPY SHEET MAPPING SENSOR

Proposed Michael Carlotta U.S. C1.346175 Classification

Int. C1. GOlD 15/18

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 2 MarcMAprill992 75

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COPY SHEET MAPPING SENSOR(Cont'd)

In a low cost thermal ink jet marking system, designed for home and office use, it is necessary to inexpensively determine the location of a sheet of paper that may be manually placed in the system for printing thereon. For example, such a system may include a fixed platen, 18, and a moving printhead, 14, similar to that illustrated by the figure. In operation printhead 14 is rigidly connected to the fast-scan carriage 12, which is slideably connected to alignment rails 16. Movement of the fast-scan carriage in the direction indicated by arrow X is accomplished by sliding the carriage along the rails using a commonly known drive belt, drive wire, or lead screw mechanism (not shown). Displacement in the direction indicated by arrow Y is achieved by moving the alignment rails in a similar fashion. During printing, it is desirable to avoid printing beyond the edges of the sheet or stock, due to problems associated with smearing or smudging of ink deposited on metal platen 18.

Accordingly, the present invention is directed at accurately detecting the position of paper or similar sheet stock positioned on the platen. Because the platen is metallic, the invention employs a metallic contact sensor to detect when a sheet is interposed in the region between fast scan carriage 12 and platen 18. More specifically, a flexible metallic leaf 22, which is affixed to carriage 12, is biased so as to contact platen 18. Leaf 22 is mechanically...