Murray Megan Thompson

US Patent:

48811610, Nov 14, 1989

Filed:

Jan 29, 1988

Appl. No.:

7/149713

Inventors:

Murray A. Thompson - Madison WI

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G05F 100

US Classification:

36416701

Abstract:

A stepping motor control and driving circuit is provided to control stepping motors used to move a manipulator robot. The stepping motor control receives digital desired velocity and acceleration data from a controller computer and uses those instructions to generate and maintain appropriate control signals. The drive circuit, operating in response to the control signal, uses a summing amplifier responsive to output voltage and current to control the output impedance of the circuit.

US Patent:

50539485, Oct 1, 1991

Filed:

Feb 4, 1991

Appl. No.:

7/651109

Inventors:

Gary W. DeClute - Stoughton WI
Ann P. Varda - Madison WI
Murray A. Thompson - Madison WI

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

G11B 1704
G06F 1300

US Classification:

364200

Abstract:

An optical archive storage system includes a large number of off-line optical disks which are selectively transported to read/write units by a robotic manipulator. Access to the data files on the disks is maintained and controlled through the use of a token file on a magnetic storage device on a controller computer for each data file on each disk. The file attributes which the operating system of the computer assigns to the token file are used to control access and ownership of the data files on the disks.