Servo system for maintaining constant tension on a web

Details Servo system for maintaining constant tension on a web Servo system for maintaining constant tension on a web

1977-02-16

1978-11-21

Schaefer, Robert K.

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318 6, 355 40, 242 7551, B65H 5938, B65H 7700, H02P 546, H02P 768

Patent

active

041268172

ABSTRACT:
Apparatus for maintaining constant tension on a web during movement thereof, e.g., during positioning original documents in an exposure station of a reproduction machine. The web is coupled between a take up reel and a supply reel, with each reel being driven by an electric motor. The two motors are energized by a signal from the same source, except that the signal applied to the supply reel motor is the derivative of that applied to the take up reel motor. In such manner, the supply reel is energized during periods of acceleration or deceleration of the web thereby maintaining constant tension on the web during positioning.

REFERENCES:
patent: 3606201 (1971-09-01), Petusky
patent: 3664806 (1972-02-01), Belson et al.
patent: 3809335 (1974-05-01), Mantey
patent: 3863117 (1975-01-01), Paschetto
patent: 3880521 (1975-04-01), Eppe et al.
patent: 3926513 (1975-12-01), Silver et al.

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