Francis G Bardwell

US Patent:

40669424, Jan 3, 1978

Filed:

Oct 10, 1975

Appl. No.:

5/621485

Inventors:

Francis G. Bardwell - Elmhurst IL
Edmund C. Dudek - St. Charles IL

Assignee:

Thor Power Tool Company - Aurora IL

International Classification:

H02K 1732
H02K 2368
H02K 2730

US Classification:

318434

Abstract:

This disclosure deals with a control circuit for a tool including a motor for turning a rotatable power output shaft of the tool. A torque measuring device is coupled to the shaft and generates a signal which is a function of the torque output. The control circuit responds to the torque output and to a reference signal representing a preselected torque, and automatically turns off the motor when the torque output reaches the preselected torque. Further, the control circuit may cyclically turn the tool on and off at very short time intervals as the preselected torque value is being approached, in order to reduce the reaction torque felt by an operator of the tool. In addition, the lengths of the on times in successive cycles may be gradually decreased as the torque output level increases, with the result that the average reaction torque remains substantially constant even though the peak torque output increases.

US Patent:

41601998, Jul 3, 1979

Filed:

Jul 5, 1977

Appl. No.:

5/812787

Inventors:

Francis G. Bardwell - Elmhurst IL

Assignee:

Stewart-Warner Corporation - Chicago IL

International Classification:

G05B 1936

US Classification:

318577

Abstract:

This disclosure deals with a line or pattern following system for use with a machine including first and second motors for moving a device in first and second generally perpendicular directions. The system includes an array of light sensitive elements arranged at angularly juxtaposed positions, the array being positioned adjacent said line or pattern. An image of the line or pattern falls on the array and makes an angle. theta. with a reference point on the array. The system further includes means for sequentially scanning the outputs of the elements, and angle means responsive to said outputs and to said reference point for generating first and second signals. The first signal is a function of sin. theta. and is connected to control energization of the first motor, and the second signal is a function of cos. theta. and is connected to control energization of the second motor.

US Patent:

46477608, Mar 3, 1987

Filed:

Oct 3, 1983

Appl. No.:

6/538494

Inventors:

Francis G. Bardwell - Elmhurst IL

Assignee:

Stewart-Warner Corporation - Chicago IL

International Classification:

G05B 100
G05B 1933

US Classification:

250202

Abstract:

A pattern tracer with circuitry for electronically adjusting the lateral offset of the tracing element for kerf compensation, that produces a control signal based on a temporal relationship between a reference signal and a pattern detection signal associated with a preselected kerf compensation. The pattern is traced with the selected lateral offset in accordance with a control signal. The control signal is developed in response to both a line width compensation signal and a kerf compensation signal. A photometric detector is calibrated by electronically adding a compensation angle to a pattern detection angle to compensate for any physical misalignment of the detector.