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PIEZOELECTRIC DEVICE TO BOTH REMOVE FRICTION AND FUNCTION AS A BRAKE

IP.com Disclosure Number: IPCOM000026064D
Original Publication Date: 1990-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 214K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 illustrates an x-y scanner 10 comprising a fast scanning carriage 12 which operates bidirectionally scanning across the paper 11 and is mounted to an indexing carriage 13 which indexes transversely down the paper between scans.

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XEROX DISCLOSURE JOURNAL

PIEZOELECTRIC DEVICE TO Proposed Classification BOTH REMOVE FRICTION AND U.S. C1.350/006.1 FUNCTION AS A BRAKE
G02b C1. Int. Denis J. Stemmle 26/08

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v FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 1 January/February 1990 17

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PIEZOELECTRIC DEVICE TO BOTH REMOVE FRICTION AND FUNCTION AS A BRAKE(Cont'd)

fr 33

1

28

28

FlG. 3

18 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 1 JanuaryIFebruary 1990

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PIEZOELECTRIC DEVICE TO BOTH REMOVE FRICTION AND FUNCTION AS A BRAKE(Cont'd)

Figure 1 illustrates an x-y scanner 10 comprising a fast scanning carriage 12 which operates bidirectionally scanning across the paper 11 and is mounted to an indexing carriage 13 which indexes transversely down the paper between scans.

Two types of drives have been proposed to achieve the required positioning accuracy for the index carriage, a single sided and double sided drive. The double sided drives have the advantage of insuring carriage parallelizm however they are much more expensive, have more parts, and requires more assembly time than the single sided drive. While the single sided drive is inherently less expensive, it usually is designed such that it is mounted to and slides along a single precision ground shaft 28 as illustrated in Figures 2 and 3 to control the carriage position in two dimensions. The outboard end of the carriage slides along a rail to prevent rotation about the shaft just mentioned. As illustrated in the plan view of Figure 2 and the end view of Figure 3 the fast scanning carriage 12 is driven by belt 32 and motor 33 while the indexing carriage 13 is positioned on shaft 28 by belt 30 and motor
31.

Another limitation to the single sided drive design is the effect of residual friction forces on the final position of the carriage after each index. Because the outboard end of the carriage will have some finite friction drag force while it is in motion, this drag force will deflect the cantilevered index carriage as well as distort the precision shaft on which the carriage is mounted. After the index motion is complete, the friction drag load remains. Thus, the carriage and shaft remain slightly deformed unless the value of the friction drag load on the outboard end is reduced to zero. So long as the friction drag has a finite value, the carriage remains slightly deformed. There are two problems associated with this condition: first, the friction drag load is not a constant? and therefore the amount of carriage deformation will change from index to index. The friction drag load varies both because the coefficient of friction cannot be relied upon to remain constant under all conditions of contamination, wear, humidity, etc.,. and secondly because the normal force on the outboard side of the index carriage changes from index to index due to the position of the fast scan carriage (inboard...