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