Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1974-04-25
1976-04-13
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318603, G05B 1300
Patent
active
039506851
ABSTRACT:
A system enables selective control of instantaneous motor armature position and, thus, the corresponding position of one or more elements driven by the motor. As utilized in a high speed printer, the system governs positioning of a printhead, enabling high speed movement of the latter from one location to the next and yet bringing it to a complete stop exactly at a selected or desired location. Additionally, the system enables position control with respect to movement over different predetermined distances such as, in the printing embodiment, of character or word spacings, carriage returns, tab sets and vertical indexing. Operationally, armature position-representative pulses are counted and analyzed to determine during acceleration when one desired position has been reached and, during subsequent deceleration, to determine when zero movement has been reached. At least during deceleration, the system also monitors corresponding change of position and adjusts the speed of movement as necessary so that, ultimately, a desired stop position is reached. As embodied, the count information also is utilized to accomplish such functions as carriage return and margin correction.
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Ginsburg M.
LRC, Inc.
Schaefer Robert K.
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