Electricity: motive power systems – Braking – 'plugging' or application of reverse power to motor
Reexamination Certificate
2007-03-20
2007-03-20
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Braking
'plugging' or application of reverse power to motor
C318S757000, C318S763000, C318S432000, C318S466000, C400S582000, C400S709000, C271S256000, C271S258010
Reexamination Certificate
active
10461841
ABSTRACT:
A method for rotating a printer paper-feed roller wherein the roller is driven by a DC (direct current) motor. A feedback-control signal is applied to the motor until the roller reaches a desired rotational position. The feedback-control signal is a function of an error signal, and the error signal represents the difference between the actual rotational position and the desired rotational position of the roller. When the roller reaches the desired rotational position, the applied feedback-control signal is removed from the motor, and a direct-control biasing signal is applied to the motor to reduce or prevent rollback of the roller when the feedback-control signal is removed from the motor. In one example, the signals are PWM (pulse-width-modulated) signals.
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Stout Barry Baxter
Writt John Thomas
Colon Eduardo
Donovan Lincoln
Lexmark International Inc.
Thompson Hine LLP
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