24 pin dot printer head and method of making the same

Details 24 pin dot printer head and method of making the same 24 pin dot printer head and method of making the same

1994-09-12

1996-09-17

Hilten, John S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

40012420, 40012429, 4001243, B41J 225

Patent

active

055562116

ABSTRACT:
A method for manufacturing a print wire for a 24-pin dot printer head comprises the steps of first annealing an oil temper thin elongated wire rod at a predetermined rate to remove internal strains and eliminate distortions and imperfections after the oil temper wire rod is heated at a specified temperature for a specific length of time, cold forging the wire rod at room temperature or below a recrystallization temperature to form a needle cap having two successively different diameters at one end of the wire rod and then plating the entire wire rod including the needle cap with an electroless nickel material to reinforce possible cracks occurred during the cold forging process. The wire rod may be straightened and cut before or after the formation of a needle cap.

REFERENCES:
patent: 3826000 (1974-07-01), Du Rocher et al.
patent: 3833105 (1974-09-01), Howard
patent: 3850278 (1974-11-01), Mihm et al.
patent: 3952411 (1976-04-01), Louis
patent: 4143979 (1979-03-01), Nelms
patent: 4256948 (1981-03-01), Wolf et al.
patent: 4500027 (1985-02-01), Nakajima
patent: 4569604 (1986-02-01), Adachi et al.
patent: 4652157 (1987-03-01), Uzawa et al.
patent: 4867583 (1989-09-01), Caulier et al.

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