Drive circuit for printing head

Details Drive circuit for printing head Drive circuit for printing head

1977-11-02

1979-07-24

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9303, 361152, 400166, B41J 312

Patent

active

041621310

ABSTRACT:
A drive circuit is responsive to input pulses to supply drive energy pulses to the printing head of a matrix printer so as to produce constant impact forces and constant print intensity over a wide range of print rates by decreasing the energy of the drive pulses as a function of the time interval between successive input pulses as said interval diminishes below a predetermined value. In one embodiment the amplitude of the drive pulses is reduced as the frequency of the input pulses exceeds the predetermined value. In a second embodiment the duration of the drive pulses is reduced as the frequency of the input pulses exceeds the predetermined value.

REFERENCES:
patent: 3456161 (1969-07-01), Soltis
patent: 3711754 (1973-01-01), Nemoto
patent: 3789272 (1974-01-01), Vollhardt
patent: 3866533 (1975-02-01), Gilbert et al.
patent: 3904010 (1975-09-01), Krauss et al.
patent: 3921517 (1975-11-01), Barcomb et al.
patent: 3991869 (1976-11-01), Berrey
patent: 3994381 (1976-11-01), Hebert
patent: 4024506 (1977-05-01), Spaargaren
patent: 4027761 (1977-06-01), Quaif
patent: 4079824 (1978-03-01), Ku

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