Film tension sensing device

Details Film tension sensing device Film tension sensing device

1996-02-09

1997-07-15

Mathews, A. A.

Photography

With exposure objective focusing means, focusing aid, or...

Processing circuit

396176, 226 44, 2423346, G03B 154, G03B 2100

Patent

active

056488343

ABSTRACT:
A tension sensing device for motion picture projection equipment is intended for use in a platter feed system. The device is mounted upon a column of a platter system, having a pivoting arm and a stationary or limiting arm. The film is fed over a roller on the pivoting arm, which rests on a micro-switch. The presence of tension in the film feed will cause elevation of the pivot arm, triggering a signal from the micro-switch to a control box. A timing sequence is initiated; if a pre-determined time interval is reached, the power to the projector equipment is interrupted. This device allows for more precise determination of true headwrap condition, avoiding false conditions, and offers a more durable and reliable sensing device.

REFERENCES:
patent: 3583799 (1971-06-01), Walter
patent: 3823890 (1974-07-01), Potts
patent: 4012003 (1977-03-01), Cochran et al.
patent: 4283766 (1981-08-01), Snyder et al.
patent: 5189451 (1993-02-01), Bredin

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