Print hammer coil current control

Details Print hammer coil current control Print hammer coil current control

1994-10-06

1995-07-04

Wiecking, David A.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

400166, B41J 938

Patent

active

054294428

ABSTRACT:
A low cost, integrated circuit compatible, circuit for constantly controlling the current in a print hammer coil is provided. The circuit is suitable for use with a hammer coil driven from the low voltage side (bottom drive) and in series with a sense resistor. A programmable reference that actively compensates the coil current for drift in the hammer coil bias power supply reference generating means is included to allow accurate detection of coil current levels. The control circuit reduces generated noise and has good noise immunity.

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I.B.M. Technical Disclosure Bulletin vol. 23 No. 9 Feb. 1981 pp. 4107-4109.
"Compact Current to Voltage Received with High Input Noise Immunity", Research Disclosure, N326, Jun. 1991, 32641.
IBM TDB, vol. 30, No. 6, Nov. 1987, "Print Hammer Drive Circuit", G. Melnyk et al., pp. 247-248.

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