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Alignment Fixture

IP.com Disclosure Number: IPCOM000090441D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Ryan, WJ: AUTHOR

Abstract

The alignment fixture utilizes a pair of dual-wedge assemblies 1 which, when actuated by servomotors or by threaded spindles 2 and 3, align carriage 4 in an X-Y direction against spring-loaded backing assemblies 5. Each wedge assembly 1 includes wedge members 6 and 7 having different pitches which, upon actuation, individually slide in opposition to each other via center wedge 8 between a stationary block 9 and carriage 4 to move the latter in desired increments. Wedge 8 moves transverse wedges 6 and 7 by containment between guide blocks 10 and 11. All moving surfaces are interfaced with bearings 12 to reduce friction. The pitches of wedges 6 and 7 are varied to provide a corresponding difference in linear translation to carriage 4 so that coarse and fine positioning is attained.

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Alignment Fixture

The alignment fixture utilizes a pair of dual-wedge assemblies 1 which, when actuated by servomotors or by threaded spindles 2 and 3, align carriage 4 in an X-Y direction against spring-loaded backing assemblies 5. Each wedge assembly 1 includes wedge members 6 and 7 having different pitches which, upon actuation, individually slide in opposition to each other via center wedge 8 between a stationary block 9 and carriage 4 to move the latter in desired increments. Wedge 8 moves transverse wedges 6 and 7 by containment between guide blocks 10 and 11. All moving surfaces are interfaced with bearings 12 to reduce friction. The pitches of wedges 6 and 7 are varied to provide a corresponding difference in linear translation to carriage 4 so that coarse and fine positioning is attained. Compensation for backlash is obtained by utilization of backing assemblies 5 which include two rollers 13 mounted about pivot 14, and inwardly loaded by spring 15.

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