Film tracking mechanism

Details Film tracking mechanism Film tracking mechanism

1987-01-13

1988-05-24

Mathews, A. A.

Advancing material of indeterminate length

By intermittent material-mover

Comprising material-moving roll

354212, 354217, 354266, 226 62, G03B 122, G03B 1736

Patent

active

047469439

ABSTRACT:
A single mechanism performs three or four functions in a camera, the advancement of a film (6) mounted therein being used to provide energy to the mechanism. A tracking pin (2) is guided in a track (3) causing a tracking member (1) to move in a cyclic manner. For part of the cycle, a clawed end (4) of the tracking member (1) is in engagement with the film (6), the advancement of which causes movement of the tracking pin (2) along the forward portion (3a) of the track (3), and extension of a first tension spring (12). On movement of a shutter release lever (11) the tracking pin (2) moves rapidly along the remaining rear portion (3b) of the track (3) under the action of the tension springs (12, 13). A frame counter mechanism (7, 8, 9, 10) is actuated by the tracking member (1) at a convenient point. The shutter mechanism is also activated at a suitable point after operation of the shutter release lever (11).

REFERENCES:
patent: 1403106 (1922-01-01), Pittman
patent: 3765583 (1973-10-01), Mathes
patent: 4203335 (1980-05-01), Coffey

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