Method and means for operating a pair of pinch rolls

Details Method and means for operating a pair of pinch rolls Method and means for operating a pair of pinch rolls

1976-08-16

1977-11-08

Schacher, Richard A.

Advancing material of indeterminate length

Processes

226 42, B65H 2322

Patent

active

040571858

ABSTRACT:
A method and apparatus for operating a pair of vertically disposed pinch rolls to facilitate the withdrawal of a strip of material from a rotatable mandrel is disclosed. The lower roll is operated conventionally at a preselected rotational velocity tending to advance the bottom surface of the strip through the rolls at a corresponding speed. The top roll is operated hydrostatically in response to strip speed and torque output feedback signals so as to maintain a constant output torque at a rotational velocity tending to advance the top surface of the strip at the monitored value of strip speed. As a result, the strip is advanced through the pinch rolls at a speed corresponding to the preselected rotational velocity of the bottom roll.

REFERENCES:
patent: 3771703 (1973-11-01), St. Denis
patent: 3905533 (1975-09-01), Corse

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