Film transport device

Details Film transport device Film transport device

1990-11-19

1992-05-05

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With speed regulation or selection

352187, 352182, G03B 2148

Patent

active

051102013

ABSTRACT:
Film transport device with a film transport sprocket driven by a drive motor whose teeth engage the holes in a motion picture film with play and transport the latter stepwise one frame at a time and final-position it at a film gate. The film transport steps are subdivided into a transport phase (t.sub.T) and a position-adjusting phase (t.sub.R) in which the film is final-positioned accurately. The transport phase (t.sub.T) is divided into a very short acceleration phase (t.sub.1, t.sub.2) in which a high torque setting (M.sub.S1) is set with a steep acceleration rise (t.sub.1), and a long continuous drive and braking phase (t.sub.3, t.sub.4), whose time constant is a multiple of the acceleration phase (t.sub.1, t.sub.2). This ensures minimum transport noise and film-protective transport.

REFERENCES:
patent: 4022525 (1977-05-01), Boudouris
patent: 4253749 (1981-03-01), Boudouris
patent: 4697896 (1987-10-01), Fox

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