Take-up device speed controller using magnetic sensing means

Details Take-up device speed controller using magnetic sensing means Take-up device speed controller using magnetic sensing means

1980-03-07

1981-10-06

Christian, Leonard D.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

242 753, B65H 5938

Patent

active

042931088

ABSTRACT:
In systems for taking up elongated strips on a take-up device, such as taking up film onto a film platter, it is desirable to have an arrangement for controlling the speed of the take-up device in accordance with the amount of slack in the strip. To accomplish this, a slack indicating means, such as a film roller, is located between a strip supply means and the take-up device so that the strip passes over it. The slack indicating means has a magnet coupled to it. The position of the slack indicating means along a predetermined path is determined by the effect of the magnet on the operative state of a plurality of magnetically actuated switches located along the predetermined path. The operative state of these switches, in turn, controls the speed of the take-up device by controlling a resistive circuit or other control means.

REFERENCES:
patent: 2904275 (1959-09-01), Selsted et al.
patent: 3172611 (1965-03-01), Harris
patent: 3780959 (1973-12-01), Burth
patent: 4169566 (1979-10-01), Boudouris

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