Method and apparatus for producing a speed control voltage for direct current motors in typewriters or similar office machines
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United States of America Patent
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-
Aug 22, 1989
Grant Date -
N/A
app pub date -
Jul 27, 1987
filing date -
Jul 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and means for producing a control voltage for controlling a direct current motor makes use of a tachometer voltage providing two ninety degree phase shifted tachometer signals. From these are derived four coding signals comprising the tachometer signals and their inverse signals. The four signals are combined to produce a triangular signal, which is differentiated. The differentiated signal and its inverse are applied through a switching circuit to produce a control signal.
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Cited Art Landscape
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