Roll film drive control arrangement

Details Roll film drive control arrangement Roll film drive control arrangement

1978-01-05

1979-08-28

Truhe, J. V.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318434, 318477, H02P 308

Patent

active

041662393

ABSTRACT:
Drive control arrangement for roll film having an end attached to a reel shaft and in which an increase in the load imposed on a reel drive motor caused by increased tension in the film when the attached end of the film is reached during film unwinding, or rewinding, is detected by a detection means which in response to the load increase produces an output causing the motor power supply circuit to open, whereby movement of the film is stopped, and risk of damage to the film or the drive system is avoided. The invention offers the advantage that no special marking of the film is required, and that the drive means is easily associated with conventional film drive systems.

REFERENCES:
patent: 3199910 (1965-08-01), Bradley
patent: 3525481 (1970-08-01), Longland
patent: 3845373 (1974-10-01), Totsu et al.
patent: 3931557 (1976-01-01), Osburn

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