Needle printing head

Details Needle printing head Needle printing head

1978-03-30

1979-11-13

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

310328, B41J 312, H02K 4900

Patent

active

041741820

ABSTRACT:
A plurality of printing needles forming an array are mounted in a printing head and are periodically driven to impact a printing ribbon onto a recording medium. The printing head contains a brake for each needle so that selected needles can be prevented from striking the printing ribbon allowing the formation of a desired character matrix pattern on the recording medium. Each brake may be driven by a piezoelectric element.

REFERENCES:
patent: 2683410 (1954-07-01), Wockenfuss et al.
patent: 3215244 (1965-11-01), Hickerson
patent: 3454206 (1969-07-01), Williams
patent: 3715020 (1973-02-01), Nordin

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