Robert H Comstock

US Patent:

42635276, Apr 21, 1981

Filed:

May 17, 1979

Appl. No.:

6/039901

Inventors:

Robert H. Comstock - West Acton MA

Assignee:

The Charles Stark Draper Laboratory, Inc. - Cambridge MA

International Classification:

H01L 4108

US Classification:

310316

Abstract:

A piezoelectric actuator and a control circuit therefor to apply a charge to the actuator proportional to an input signal magnitude. The charge controlled actuator achieves a more linear input-displacement response with reduced hysteresis.

US Patent:

47679336, Aug 30, 1988

Filed:

Jul 21, 1987

Appl. No.:

7/076060

Inventors:

Andrew J. French - Palm Bay FL
James Ford - Melbourne FL
Thomas Flenner - Melbourne FL
Robert Comstock - Sarasota FL

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G01N 2186

US Classification:

250548

Abstract:

An adjustable optical ribbon edge sensor having a relatively short throat for ease of loading a towel ribbon in a high-speed line printer includes one or more pairs of photosensitive switches, coupled through a variable resistor, to a comparator facilitates accurate and repeated detection of the ribbon edge regardless of the color of the ribbon. By adjusting the variable resistor, the comparator is biased for the particular color ribbon in use.

US Patent:

45063214, Mar 19, 1985

Filed:

Sep 8, 1982

Appl. No.:

6/416357

Inventors:

Robert H. Comstock - Andover MA
William P. Curtiss - Winthrop MA
Donald E. Fulton - Stoneham MA

Assignee:

IMEC Corporation - Boston MA

International Classification:

G05B 1300

US Classification:

364174

Abstract:

A microprocessor-based motor control system operates the rapid advance motor on a slide transfer machine to carry out rapid traverse motions in minimal time. A velocity profile is stored during the acceleration portion of the move and this data is employed to determine when deceleration should begin and to control velocity during the deceleration portion of the move. A position feedback circuit having programmable resolution is employed to develop the velocity profile.