Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1975-02-03
1977-05-24
Dobeck, B.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318207R, 318255, 318284, H02P 142
Patent
active
040258300
ABSTRACT:
A motor switching and control circuit is disclosed in which the direction of transport of web material transferred between two reels is reversed by detecting a condition requiring reversal, generating a reversing signal in response to the detected condition, and switching the direction of rotation of an AC motor in response to the reversing signal. Both motor direction switching and reversing condition detection switching are accomplished at substantially zero motor current flowing through and zero motor voltage across the contacts of any circuit switches, thereby eliminating radio frequency interference and logical noise generation during switching. The circuit is particularly useful in connection with the ribbon control drive in an impact printer such as a matrix printer.
REFERENCES:
patent: 3436632 (1969-04-01), Tisserant et al.
patent: 3688170 (1972-08-01), Karklys et al.
patent: 3697841 (1972-10-01), Nystuen
patent: 3818295 (1974-06-01), Poppinger
patent: 3848165 (1974-11-01), Heiberger
Cavender J. T.
Computer Peripherals Inc.
Dobeck B.
Hawk Jr. Wilbert
Morris Jeffrey P.
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