Browse Prior Art Database

Wedge Drive Assembly

IP.com Disclosure Number: IPCOM000062216D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Blair, EA: AUTHOR [+4]

Abstract

This article describes a wedge drive assembly which allows machine "zero" and electronic control "zero" to be accomplished independently prior to a substrate test. There are three wedge drive assemblies X, Y and theta (/) in this system, as shown in Fig. 1. The X and Y wedge drives are shown in detail in Fig. 2. Each converts rotary motion of its geneva driven reduced gear box, as illustrated in Fig. 3, to linear motion to position the X and Y rings (tables) 4 and 5, respectively. This is done through a connector arm 6 (Fig. 2) which is fastened and doweled to each of the respective X and Y rings. In the case of the / wedge drive, rotary motion is converted to an angular motion in that a gear sector is substituted for the connector arm of the "X" and "Y" drives.

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Wedge Drive Assembly

This article describes a wedge drive assembly which allows machine "zero" and electronic control "zero" to be accomplished independently prior to a substrate test. There are three wedge drive assemblies X, Y and theta (/) in this system, as shown in Fig. 1. The X and Y wedge drives are shown in detail in Fig. 2. Each converts rotary motion of its geneva driven reduced gear box, as illustrated in Fig. 3, to linear motion to position the X and Y rings (tables) 4 and 5, respectively. This is done through a connector arm 6 (Fig. 2) which is fastened and doweled to each of the respective X and Y rings. In the case of the / wedge drive, rotary motion is converted to an angular motion in that a gear sector is substituted for the connector arm of the "X" and "Y" drives. For linear movement of the connector arm 6, a slot in slide 7 engages the tang 8 of the arm regardless of slide travel and is perpendicular to arm travel. All wedge drive assemblies are offset at such an angle that for each complete revolution of the output shaft of the gear box, the arm moves through an incremental linear distance of .0005 inch. Total travel is .020 in. or + or -.010 in. in either direction from machine "zero". For; the / wedge drive, total travel is approximately 1.5 degrees. Travel (linear and angular) is a function of mapping data translated through each encoded gear box drive motor. Independently zeroing machine and electronic controls are accomplished in the following manner: Subsequen...