Angular scan drive system having means for selectively extending

192 clutches and power-stop control – Elements – Wear compensators

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192 71, 192 84T, 185 29, G02B 2610

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active

048221210

ABSTRACT:
An angular scan drive system is disclosed which permits the range of motion of a scanning mechanism to be selectively extended. The invention includes a mass (typically the scanning assembly) which is pivotally attached to a frame to scan in an oscillatory motion during a normal course of operation. A spring is included for applying a restoring force between the frame and the mass and, in accordance with the teachings of the invention, a mechanism is included for selectively coupling and decoupling the mass and the frame through the spring. In a particular embodiment, for example, the mechanism decouples the spring from the frame and attaches the free (frame) end of the spring to the mass on command during a specified portion of the scan cycle. Thus, both ends of the spring are attached to the mass thereby removing the restoring force of the spring from the assembly. With the restoring force of the spring removed, the pivotally mounted scanning assembly subsequently scans outside the nominal range to permit the performance of secondary taks until the mechanism is commanded to detach the frame end of the spring from the mass and to recouple it to the frame. At this point, normal operation resumes.

REFERENCES:
patent: 3888562 (1975-06-01), Rushing et al.
patent: 3891299 (1975-06-01), Rushing
patent: 3952217 (1976-04-01), Rawlings
patent: 4316648 (1982-02-01), Lissack
patent: 4422530 (1983-12-01), Denton

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