Browse Prior Art Database

COMPLIANT LEADSCREW SPLIT NUT

IP.com Disclosure Number: IPCOM000025847D
Original Publication Date: 1988-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 98K

Publishing Venue

Xerox Disclosure Journal

Abstract

In raster aperture card scanners, the image source, a microfilm bearing aperture card, must be precisely positioned and moved during the scanning process. For this, a slide assembly 1 (shown in Figure 1) is used, slide assembly 1 having a movable carrier 2 on which the aperture card to be scanned is placed. However, precise motion is required in order to allow the scanning element, typically a Charged Coupled Device (CCD), to sample the microfilm and convert the film image to image signals or pixels. In order to effect the precise movement required, a screw and nut drive is normally used to impart reciprocating scanning movement to the aperture card carrier 2.

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CEROX DISCLOSURE JOURNAL

COMPLIANT LEADSCREW Proposed Classification SPLIT NUT US. C1.36012
Peter A. Sardano Int. C1. Gllb 25/04

i

FIG. 2

Volume 13 Number 3 May/June 1988 175

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COMPLIANT LEADSCREW SPLIT NUT (Cont'd)

In raster aperture card scanners, the image source, a microfilm bearing aperture card, must be precisely positioned and moved during the scanning process. For this, a slide assembly 1 (shown in Figure 1) is used, slide assembly 1 having a movable carrier 2 on which the aperture card to be scanned is placed. However, precise motion is required in order to allow the scanning element, typically a Charged Coupled Device (CCD), to sample the microfilm and convert the film image to image signals or pixels. In order to effect the precise movement required, a screw and nut drive is normally used to impart reciprocating scanning movement to the aperture card carrier 2.

Heretofore, in order to provide intimate contact required between the threads of the leadscrew and the threads of the nut, an external biasing spring or friction retarding clutch was required. The major drawback, however, to systems of this kind is the large quantity of space required for the mechanism, which does not lend itself to applications such as raster aperture card scanners where space is at a premium.

In the slide assembly 1 shown in Figures 1 and 2 (the carrier subassembly is illustrated in the inverted position in Figu...