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Programmable Print Hammer Driver Circuit for Daisy Wheel Printer Disclosure Number: IPCOM000048633D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-09

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Hallman, BL [+details]


The purpose of the circuit described below and illustrated in the drawings is to provide a constant energy pulse to a print hammer coil of a daisy wheel printer. Further, it allows the user to program any pulse shape or duration in order to maximize energy utilization. The circuit's on-board power dissipation is significantly lower than conventional circuits, resulting in lower heat generation. Finally, the circuit described below allows the implementation of improved current-chopping techniques, requires no regulated power supply, allows complete current pulse shaping, and provides a self-generated clock.