Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by movement of record-medium against type-face
Patent
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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IBM TDB, vol. 30, No. 6, Nov. 1987, "Print Hammer Drive Circuit", G. Melnyk et al., pp. 247-248.
Belk Michael E.
International Business Machines Corp.
Kelley Steven S.
Wiecking David A.
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