Film deceleration unit

Details Film deceleration unit Film deceleration unit

G - Physics

03

B

G03B 1/18 (2006.01) G03B 1/22 (2006.01)

Patent

CA 2094915

A projector having a rolling loop film transport mechanism is provided with a film decelerating cam unit (52) that is located in adv- ance of the aperture of the projector. Deceleration pins (66) carried by a pair of verti- cally spaced arms (62) that project from the cam unit, en- gage in upper and lower mar- ginal perforations in the film and travel with the film tow- ards the aperture and deceler- ate the film as each frame is advanced. The cam unit in- cludes two cams (56, 58), one of which causes the decelerat- ing motion of the pins, and a return motion in the reverse direction, while the other cam (58) causes the pins to adv- ance and retract into and from the film path respective- ly. By positively retracting the pins, their return movement against the direction of film travel can take place independent of the motion of the film. As compared with the prior art, acceleration forces and resultant stresses on the cam are reduced and the cam unit can operate at higher frame rates and/or with smaller rotor gaps.

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