Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1974-07-01
1976-02-03
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 7551, B65H 2308, B65H 2522
Patent
active
039360083
ABSTRACT:
A web tension control system for a reel stand used with a web-fed printing press in which web material is pulled into the press and unwound from a roll on a reel and having a dancer engaging a loop in the web material intermediate the roll and the press. The dancer applies a constant force to the web material at the loop irrespective of the position of the dancer within its range of travel. The reel is equipped with a friction brake whose retarding torque is controlled by a resultant control signal to which several signals contribute. A first signal contributing to the resultant control signal is proportional to the instantaneous radius of the roll of web material and is produced by digitally dividing the press speed by the angular speed of the reel. A second contributing signal is a negative feedback signal that is proportional both to the computed roll radius and to the dancer position. Torque applied by the brake in response to the resultant signal tends to maintain the dancer in a predetermined central position. When the press is coming to a stop a predetermined web tension is achieved by controlling the brake torque in proportion only to the first signal.
REFERENCES:
patent: 2965326 (1960-12-01), Rockstrom
patent: 3031152 (1962-04-01), Cohen et al.
patent: 3497154 (1970-02-01), Lasarev et al.
patent: 3564219 (1971-02-01), Mutziger
patent: 3718289 (1973-02-01), Alaimo
patent: 3822838 (1974-07-01), Butler et al.
patent: 3834648 (1974-09-01), Rose et al.
Gilreath Stanley N.
Harris Corporation
Jillions John M.
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