Browse Prior Art Database

Adjustable Positioning Device

IP.com Disclosure Number: IPCOM000042572D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Hamilton, RD: AUTHOR [+2]

Abstract

This article describes a positioning device allowing a precise positioning of an element holder along two orthogonal axes using a single piece of metal to provide X-Y motion. Referring to Fig. 1, base A is made from one piece of metal. Thin sections A1 and A2 form flexures. Arms A3 and A4 pivot by means of sections A1 and A2. Mounting pads A5 are firmly attached to element holder B. Sections A1 and A2 allow pads A5 to remain in fixed contact with holder B as arms A3 and A4 pivot. Adjustment screws C and D serve to pivot arms A3 and A4. Referring now to Fig. 2, screws C and D are fitted with notched washers E, stop nuts F and spring washers G. The notches in washers E fit over pins H in arms A3 and A4, and the screws are threaded into base A.

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Adjustable Positioning Device

This article describes a positioning device allowing a precise positioning of an element holder along two orthogonal axes using a single piece of metal to provide X-Y motion. Referring to Fig. 1, base A is made from one piece of metal. Thin sections A1 and A2 form flexures. Arms A3 and A4 pivot by means of sections A1 and A2. Mounting pads A5 are firmly attached to element holder B. Sections A1 and A2 allow pads A5 to remain in fixed contact with holder B as arms A3 and A4 pivot. Adjustment screws C and D serve to pivot arms A3 and A4. Referring now to Fig. 2, screws C and D are fitted with notched washers E, stop nuts F and spring washers G. The notches in washers E fit over pins H in arms A3 and A4, and the screws are threaded into base A. Spring washers G provide a lash-free contact between washers E and pins H, thereby causing the motion of arms A3 and A4 to move precisely as the adjustment screws C and D move. Nylon-tipped set screws J, also threaded into base A, serve to hold adjustment screws C and D in lash-free contact with base A and prevent unwanted rotation. Upstops K prevent arms A3 and A4 from being moved so far as to bend sections A1 and A2 beyond their elastic limit. Turning screw C causes the center of element holder B to move along axis X, and screw D causes motion along axis Y. The amount of motion is equal to the motion of the setscrews divided by the ratio of dimensions L1 and L2, which may be 10:1. Thus, very we...