Browse Prior Art Database

DUAL SPEED POLYGON

IP.com Disclosure Number: IPCOM000027058D
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

Recognizing that it is possible to extend the life of an electric motor by running it at a reduced speed during periods when the components which it drives are not in use, the present disclosure proposes such an enhancement for electronic printing and reprographic machines. More specifically, the present disclosure is directed to extending the life of a polygon motor used in a raster output scanner by running the polygon at half-speed whenever the machine is in a standby mode of operation.

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XEROX DISCLOSURE JOURNAL

DUAL SPEED POLYGON

Joseph Chiang Vittal Shenoy

Proposed Classification

U.S. C1.355/233 Int. C1. G03g 15/28

Recognizing that it is possible to extend the life of an electric motor by running it at a reduced speed during periods when the components which it drives are not in use, the present disclosure proposes such an enhancement for electronic printing and reprographic machines. More specifically, the present disclosure is directed to extending the life of a polygon motor used in a raster output scanner by running the polygon at half-speed whenever the machine is in a standby mode of operation.

Running the polygon motor at two different speeds, an imaging speed and a standby speed, is accomplished by supplying two different frequency signals to the polygon motor driver assembly, and then enabling the selection of one of the two frequency signals. As an example, with a Gekko air-bearing motor, a multiplexing circuit may be employed to select between one of two possible frequency signal inputs. Under the control of a microcontroller, the desired frequency is selected to pass through the multiplexer. It will be appreciated that additional electrical component modifications may be necessary to improve the response time of the motor upon switching from one speed to another.

In addition, the dual speed polygon described above may have a plication in

means for decreasing the audible noise of a printing machine while in standby mode.

image resolu...