Browse Prior Art Database

CARRIAGE ACCELERATION MECHANISM

IP.com Disclosure Number: IPCOM000024758D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

In xerographic imaging systems in which a document lying on a platen is scanned by a lamp/reflector arrangement, a carriage assembly of some type is employed to carry the arrangement in a line of travel beneath the platen. Figure 10 shows the drive system for a carriage assembly which has been designed to provide a gentle acceleration to reduce acceleration associated with start-of-scan operations.

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N XEROX DISCLOSURE JOURNAL

CARRIAGE ACCELERATION MECHANISM Proposed Classification Daniel W. Costanza U.S. C1. 355/8

Int. Cl. G03g 15/28

In xerographic imaging systems in which a document lying on a platen is scanned by a lamp/reflector arrangement, a carriage assembly of some type is employed to carry the arrangement in a line of travel beneath the platen. Figure 10 shows the drive system for a carriage assembly which has been designed to provide a gentle acceleration to reduce acceleration associated with start-of-scan operations.

The system consists of two grooved pulleys A and B with a cable C strung between them. The pulley pair are shown in the carriage "home" (start-of-scan) position. To initiate scanning, a clutch upstream of the mechanism (not shown) is engaged and draws pulley A at a constant speed n . Pulley A takes cable C onto a spiral groove which increases in radius until it reaches a constant radius FA. While cable C is wrapping around the spiral groove, the angular velocity of pulley B (wB) is increasing at the same rate as the radius increase on pulley A. The relationship between input and output speeds is:

Volume 6 Number 6 November/December 1981 369

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CARRIAGE ACCELERATION MECHANISM (Cont'd)

where r

(&euro3) is the spiral radius of pulley A and r (0) is the spiral radius of pulley

A 0

In order to obtain a closed looped drive, another cable D, unwrapping from pulley A onto pulley...