Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1982-09-30
1986-03-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
318577, G05B 100
Patent
active
045785740
ABSTRACT:
A pattern tracer and method of tracing in which the movement of a racing element along a pattern is controlled in accordance with an effective forward offset which is selectively less than the actual forward offset to optimize the tracing for speeds less than the maximum tracer speed. The effective forward offset is established by providing control angles which are based on the pattern angles as detected in accordance with a selected criterion depending upon the type of pattern curve detected. The control angles are either calculated from the detected pattern angles or are selected from previously stored pattern angles. A kerf setting for lateral offset of the tracing element from the pattern is partially defined by the actual forward offset, so that changes in the effective forward offset do not cause any corresponding changes to the lateral offset or require changes to the kerf setting.
REFERENCES:
patent: 4117324 (1978-09-01), Francke
patent: 4396832 (1983-08-01), Henderson
patent: 4441020 (1984-04-01), Sakamoto et al.
patent: 4453084 (1984-06-01), Brouwer
Ferrari Francis E.
Grant John W.
Douvas A. G.
Stewart-Warner Corporation
Westin Edward P.
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