Boots – shoes – and leggings
Patent
1976-02-26
1979-04-24
Ruggiero, Joseph F.
Boots, shoes, and leggings
242 581, 242 7544, 364105, 364110, 364469, 364560, G06F 1520, B65H 1918, B65H 2522
Patent
active
041515943
ABSTRACT:
A variable torque core brake exhibiting a constant coefficient of friction at all web speeds is regulated in accordance with the position of a dancer roller to maintain web tension at a constant level. Steady state changes in web tension caused by the gradual reduction of the diameter of the feed roll as web is removed therefrom are compensated for by electronically generating a signal representative of the effective diameter of the feed roll and varying the torque on the brake associated with the core of the feed roll in accordance with the signal so as to maintain a dancer roller at a substantially constant position. Transient changes in web tension are compensated for by sensing dancer roller displacement and generating a signal proportional thereto. The signal is processed by taking the derivative thereto and combining the proportional and derivative signals. The combined signal is then utilized to vary the brake torque. The signal representative of the effective roll diameter is cubed and multiplied by the combined signal so as to make the transient response of the system independent of roll diameter variations. The appropriate web tension is maintained during the automatic splicing operation by digital speed matching of the new roll and by setting the torque of the brake associated with the core of the new roll at a value determined by the diameter thereof simultaneously with the splicing operation.
REFERENCES:
patent: 3253795 (1966-05-01), Penrod et al.
patent: 3317153 (1967-05-01), Raymond
patent: 3463414 (1969-08-01), Eastcott
patent: 3782653 (1974-01-01), Jones
patent: 3813052 (1974-05-01), Swann et al.
patent: 3822838 (1974-07-01), Butler, Jr. et al.
patent: 3936008 (1976-02-01), Crum
patent: 3995791 (1976-12-01), Schoppee
patent: 4015794 (1977-04-01), Meihofer
Bobst-Champlain, Inc.
Ruggiero Joseph F.
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