Print head and drive circuit

摘要

Wire printing apparatus includes a print head having at least one print wire and associated actuating mechanism and drive circuit. In the drive circuit a capacitor is charged to a predetermined voltage through an inductance and then discharged through the coil of an electromagnet in the actuating mechanism. The current through the coil is arranged to rise and then fall. The circuit permits optimization to maximize the proportion of the energy input to the drive circuit which is transferred to the print wire.