Matrix print head impact energy control

Details Matrix print head impact energy control Matrix print head impact energy control

1975-10-21

1977-06-07

Rader, Ralph T.

Textiles: fiber preparation

101 9303, 101 9305, 101 9315, 361169, B41J 304

Patent

active

040277615

ABSTRACT:
A matrix printer impact energy control is disclosed wherein the impact energy supplied to the drive solenoids of matrix print heads is maintained substantially constant notwithstanding variations in the printer power supply output. The hammer power supply voltage is monitored and coupled, together with a derived reference voltage to a summing amplifier which is then pulse width modulated to produce a pulsed hammer drive output having constant print energy. The print energy may be increased to provide multiple copy printing capability. A single impact energy control circuit controls all of the print hammer of each print head. Synchronization of the pulse width modulator is provided by a variable frequency clock from which the pulse width modulator trigger frequency is derived.

REFERENCES:
patent: 3443514 (1969-05-01), Schwartz
patent: 3513774 (1970-05-01), Pawletko et al.
patent: 3628102 (1971-12-01), Jauch et al.
patent: 3690431 (1972-09-01), Howard
patent: 3719781 (1973-03-01), Fulton et al.
patent: 3743911 (1973-07-01), Erler
patent: 3825681 (1974-07-01), Cederberg et al.
patent: 3866533 (1975-02-01), Gilbert et al.

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