Constant energy drive circuit for electromagnetic print hammers

Details Constant energy drive circuit for electromagnetic print hammers Constant energy drive circuit for electromagnetic print hammers

B - Operations, Transporting

41

J

197/29, 342/29.1

B41J 9/36 (2006.01) B41J 9/38 (2006.01) B41J 9/50 (2006.01) H01H 47/32 (2006.01)

Patent

CA 1169142

CONSTANT ENERGY DRIVE CIRCUIT FOR ELECTROMAGNETIC PRINT HAMMERS Abstract of the Disclosure A constant energy drive circuit for an electromagnetic print hammer has a chopping circuit including a comparator which cycles a switch connecting the energizing coil of the print hammer to an unreg- ulated power supply. Changes in the drive voltage of the unregulated source are compensated for by altering the switching rate of the switch by adjusting the amplitude of a reference signal applied to the comparator. The reference signal adjustment is inverse to changes in the drive voltage.

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