Patent
1978-07-19
1980-03-11
Griffin, Donald A.
G03B 114
Patent
active
041926005
ABSTRACT:
The present invention is a film feed mechanism having a take-up shaft spaced apart from the film take-up spool. A bell crank is connected via a link to a conventional film feed control disc coupled to the take-up shaft. The reciprocal movement of the link is applied to the bell crank. The bell crank is provided with a first pawl and a second pawl. When the bell crank is moved to the right, the first pawl is in engagement with a first gear, which via second and third gears, causes the spool gear to be rotated counter-clockwise; however, the second pawl is slidingly disengaged from a rotating fourth gear. When the bell crank is moved to the left, the second pawl is in engagement with the fourth gear, which via a fifth, second and third gears cause the spool gear to be rotated counter-clockwise; however, the first pawl is slidingly disengaged from the rotating first gear. Thus, the present invention causes the spool gear to be rotated counter-clockwise in both directions of reciprocal movement of the link, and consequently, provides a widning torque of substantially constant level to the spool gear.
REFERENCES:
patent: 2227964 (1941-01-01), Drotning et al.
patent: 2241122 (1941-05-01), Drotning
patent: 3741097 (1973-06-01), Fukuda et al.
patent: 3978501 (1976-08-01), Sanada
Asahi Kogaku Kogyo Kabushiki Kaisha
Griffin Donald A.
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