Advancing material of indeterminate length – With material-responsive control means – To regulate longitudinal movement of material
Patent
1982-03-22
1985-04-30
Petrakes, John
Advancing material of indeterminate length
With material-responsive control means
To regulate longitudinal movement of material
226 25, 226 45, 242 45, 242 7552, B65H 2504
Patent
active
045138982
ABSTRACT:
A web loop control system has first and second roller stations and a web loop disposed therebetween. A dancer arm is biased into engagement with the web loop to maintain tension therein. An optical code disk is secured for rotation with the dancer arm and an optical sensing means cooperates with the code disk to generate dancer arm position information which is relayed to the motor control system to maintain a desired web loop length during both drive and stop modes. The invention as applied to a printer for serialized forms utilizes the dancer arm code disc/optical sensing means combination to insure that a between-forms perforation is present at the fuser roller nip when the system is at rest. The serialized form printing system also provides for controlled acceleration and deceleration between operating speed and a dead stop within 3/8 inch of form length. Acceleration and deceleration are closely controlled to prevent jarring or excessive acceleration of the web loop. A motor control system is employed which utilizes an error signal summed with a rate damping signal generated from an optical code disk to provide stable motor control.
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Centronics Data Computer Corp.
Pahl Jr. Henry D.
Petrakes John
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