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Print Hammer Flight Time Variation Control Disclosure Number: IPCOM000054190D
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-13

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Barcomb, JG Lee, HC Tamulis, JC Zable, JL [+details]


Repetitious pulsing of the hammer coils of a bank of hammers in a line printer eventually causes the pulsed coils to rise to some steady-state temperature. This temperature rise causes the coil resistance to rise, which in turn causes the driving current to decrease where constant voltage drivers are used. The lower driving current manifests itself in longer hammer flight time.