Manual film advance device for use in a camera

Details Manual film advance device for use in a camera Manual film advance device for use in a camera

1997-06-26

1999-05-11

Lee, Eddie C.

Photography

Battery insertion/removal/depletion responsive

396301, 396395, 396539, G03B7/26

Patent

active

059037849

ABSTRACT:
There is provided a battery presence/absence detection mechanism (80) which operates according to the presence/absence of a battery (4) in a battery housing (3). When the battery (4) does not exist in the battery housing (3) or is removed from the same during the course of advancement of film, a battery presence/absence detection lever (801) and first and second battery presence/absence transmission levers (802, 803) operate so as to pivot a first winding lock lever (701) of a double winding prevention mechanism (70) to a position where it prevents the pivotal movement of a ratchet pawl (202) in a first direction. The double winding prevention mechanism (70) is attracted to and held in a reset state in which a film advance lever (10) cannot be actuated, by a magnet (703B) of a lock control means (703) via a second winding lock lever (702). It is possible to prevent wasteful advancement of film and to enable stable advancement of film even if a battery is at the end of its life or is removed from a camera.

REFERENCES:
patent: 4146189 (1979-03-01), Sunouchi et al.
patent: 4855781 (1989-08-01), Hoshino

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