Matrix print head

Details Matrix print head Matrix print head

1979-03-30

1981-03-10

Pieprz, William

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

B41J 312

Patent

active

042550629

ABSTRACT:
A print head for matrix printing has twelve needles whose front ends are arranged in three columns and seven rows, whereby the middle one holds only two needle ends in the second and sixth row, while the other row positions each of the two outer columns hold one needle tip. This arrangement permits a significant print speed increase for a moderate weight increase, and reduces the number of weak spots in the needle guiding mouth piece.

REFERENCES:
patent: 3198306 (1965-08-01), Bachman
patent: 3405392 (1968-10-01), Milne et al.
patent: 3627096 (1971-12-01), Finnegan
patent: 3900094 (1975-08-01), Larsen et al.
patent: 4091909 (1978-05-01), Lee
Dials et al, "Printing of Display Characters", IBM Technical Disclosure Bulletin, vol. 22, No. 3, p. 1086, 8/79.
Raider, "Additional Print Positions. . ., " IBM Technical Disclosure Bulletin, vol. 17, No. 12, p. 3560, 5/75.
Darwin, "Matrix Printer" IBM Technical Disclosure Bulletin, vol. 18, No. 9, pp. 2762-2763, 2/76.
Ranta et al, "Nonbreakable Print Wires. . .," IBM Technical Disclosure Bulletin, vol. 20, No. 8, p. 2938, 1/78.

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