Printer hammerbank cam drive having pulsed startup

Details Printer hammerbank cam drive having pulsed startup Printer hammerbank cam drive having pulsed startup

B - Operations, Transporting

41

J

101/94, 101/96.1

B41J 9/12 (2006.01) B41J 25/00 (2006.01)

Patent

CA 1296572

Abstract of the Disclosure In a dot matrix line printer in which an elongated hammerbank and an opposite counterbalancing assembly are driven in opposing reciprocating fashion by a motor driven cam, the size of the cam drive motor and the current requirements thereof during startup of the printer are greatly reduced by applying current pulses to the motor in a pattern synchronous with the resonant frequency of the reciprocating cam driven system. The current pulses which are considerably smaller in amplitude than the continuous current conventionally used to produce startup are generated during alternate half cycles of the resonant frequency, causing the cam to rock back and forth until eventually the peak resistance presented by opposite lobes on the cam and the consequent maximum compression of springs within the cam followers coupling the cam to the hammerbank and the counterbalancing assembly is overcome. Thereafter, a continuous current of appropriate value is applied to the cam drive motor to produce reciprocation of the hammerbank at a desired steady state speed.

569711

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