Device for adjusting driving spring of focal plane shutter

Details Device for adjusting driving spring of focal plane shutter Device for adjusting driving spring of focal plane shutter

1981-12-31

1983-07-26

Mathews, Alan

G03B 940

Patent

active

043951058

ABSTRACT:
A device for adjusting a focal plane shutter driving spring includes a ratchet wheel which holds one end of the shutter driving spring and is arranged to adjust the driving force of the spring by the rotation thereof. The ratchet wheel is provided with a ratchet part having fine teeth arranged to engage a ratchet pawl and a gear part having relatively coarse teeth.

REFERENCES:
patent: 1231878 (1917-07-01), Grenell
patent: 4110772 (1978-08-01), Nakagawa et al.

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