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PLATEN GLASS OVER TEMPERATURE PROTECTION IN AN ELECTRONIC SCANNER

IP.com Disclosure Number: IPCOM000026194D
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

In one configuration of an electronic document scanner, once scanning of a document is complete, the scan carriage is ramped to a stop and remains stationary. No home position is sought. Most often, the scan carriage is left directly under the platen glass. If the scan carriage remains in one spot for an extended amount of time, the platen glass area over the scan carriage may overheat. Overheating may cause discoloration of the platen glass, discoloration of the calibration strip, or damage to the document handler drive belt. This is not a problem if scanning is resumed within a relatively short period of time. However, sufficient heat may build up if the scan carriage is left in the same place for greater than 4 minutes.

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XEROX DISCLOSURE JOURNAL

PLATEN GLASS OVER Proposed Classification TEMPERATURE PROTECTION IN U.S. C1.355/235
AN ELECTRONIC SCANNER
Gerald L. Coy
Frederick B. Clark

Int. C1. G03g 15/28

In one configuration of an electronic document scanner, once scanning of a document is complete, the scan carriage is ramped to a stop and remains stationary. No home position is sought. Most often, the scan carriage is left directly under the platen glass. If the scan carriage remains in one spot for an extended amount of time, the platen glass area over the scan carriage may overheat. Overheating may cause discoloration of the platen glass, discoloration of the calibration strip, or damage to the document handler drive belt. This is not a problem if scanning is resumed within a relatively short period of time. However, sufficient heat may build up if the scan carriage is left in the same place for greater than 4 minutes.

To address the problem of over heating, a wztch dog timer is started when the scan carriage is stopped. If scanning is not r-umed within 4 minutes, the scan carriage is moved to the left of the scanner's kavel path thus placing the major heat producing portion (heater blanket assembly) of the carriage under a portion of the platen bezel casting. The bezel casting is constructed of a thermally conductive alloy which acts as a heat sink. Movement of the carriage eliminates any hot spots that mry have developed had the scan carriage been left under the platen glass....