Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1975-04-07
1977-03-15
Dobeck, B.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318 98, 318113, B65H 7700
Patent
active
040126749
ABSTRACT:
A ribbon drive and motor control system in which the instantaneous speed and torque output of a pair of motors are controlled interdependently to bidirectionally transfer ribbon or other web material between a pair of storage reels mechanically coupled to the motors at a uniform ribbon velocity and tension. The motors are electrically excited in series to rotate in the same direction with the back electromotive force of one motor being used to vary the instantaneous excitation voltage applied to the other motor, while drag from said other motor is imparted to the ribbon to control the speed of the first motor. Compensation for variation of the radii of ribbon on the reels during operation is accomplished automatically by variation of motor torque and velocity to minimize variation in ribbon tension and ribbon velocity. A bridge switch actuated by signals initiated by electrical contacts near the ends of the ribbon causes the motors to reverse direction. The system results in longer ribbon life, improved tracking and increased speed capability in an impact printer without complex servo controls.
REFERENCES:
patent: 3501682 (1970-03-01), Jacoby
patent: 3704401 (1972-11-01), Miller
patent: 3912990 (1975-10-01), Kuhnlein
patent: 3913866 (1975-10-01), Hankins
patent: 3921043 (1975-11-01), Luzio
patent: 3926513 (1975-12-01), Silver et al.
Hughes James G.
Spitsbergen Merlin D.
Cavender J. T.
Computer Peripherals Inc.
Dobeck B.
Hawk Jr. Wilbert
Morris Jeffrey P.
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