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A method to detect the thickness of a document

IP.com Disclosure Number: IPCOM000011856D
Original Publication Date: 2003-Mar-20
Included in the Prior Art Database: 2003-Mar-20
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Abstract

Disclosed is a method to detect the thickness of a sheet of paper or that of a passbook, by using a sensor on the shutter of a printer. The printer detects the thickness of the sheet of paper by measuring the displacement of the feed roller while the printer is moving the shutter up to open.

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A method to detect the thickness of a document

  A printer aligns an inserted sheet of paper using a shutter and a pair of feed rollers in front of the shutter (Fig.2). After the alignment, the printer microcode opens the shutter so that the printer moves the sheet of paper into the print area (Fig.3). A sensor is attached to the shutter to detect the blind on the upper roller hold arm (Fig.1). While moving up the shutter to open, the printer microcode measures the displacement of the blind by using the sensor. The printer microcode stops the movement of the shutter after measuring the displacement of the blind. The displacement of the upper roller hold arm (and the blind on it) corresponds to the displacement of the upper roller, and the displacement of the feed roller corresponds to the thickness of the sheet of paper.

A printer can measure the thickness of a sheet of paper or that of a passbook with a small modification if the printer has a shutter by using this method.

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Disclosed by International Business Machines Corporation

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