A device is provided for commanding and confirming the operation of an
electromagnet used for actuating print hammers in high speed printers. The
electromagnet windings are fed through a constant current source and a
threshold device detects the voltage pulse caused by armature movement,
this pulse being discriminated from other pulses by suitable timing
devices. The detection of the pulse causes interruption of current to the
electromagnet and its absence triggers an alarm.
Current U.S. Class: |
361/159 ; 101/93.29; 340/659; 361/152; 400/157.2; 400/54 |
Current International Class: |
B41J 9/00 (20060101); B41J 9/52 (20060101); H01h 047/32 () |
Field of Search: |
317/DIG.4,DIG.6,123,148.5R 340/248P
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