Ametek, Inc.

Mark Hill

James A Parnell

Dan Russell Poole

John C Venthem

Apparatus, for use in conjunction with a digital plotter incorporating controlled multiple markers to create displays, for determining the position of the markers along axes of movement, comprises a detector assembly disposed at a fixed axial position relative to the plotter, and a driver for moving a marker relative to the detector assembly. The detector assembly includes means for detecting movement of the marker relative thereto and producing signals indicative of the movement. A processor interprets the signals for determining an axial position of the marker and optionally detects and compensates for a variation in the axial position of a current marker relative to the axial position of a prior marker.

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Austin, TX, United States of America

Mark Hill