Noise reducing back stopper for an impact print head

Details Noise reducing back stopper for an impact print head Noise reducing back stopper for an impact print head

1991-04-29

1992-09-22

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400121, 400689, 310327, 310326, B41J 2235, B41J 2910

Patent

active

051492130

ABSTRACT:
A print head for a dot printer of the present invention includes a plurality of armatures which support a print wire on one end. A back stopper is provided on the rear side of the armatures to stop the armature as the print wire retreats after a print strike. The back stopper is provided with openings so that when an armature strikes the back stopper, upon withdrawal from the print strike, the noise emanated from the back stopper is reduced. A sound dampening piece may be abutted to the rear of the back stopper to further reduce the noise.

REFERENCES:
patent: 3929124 (1975-12-01), Hebert
patent: 4214836 (1980-07-01), Wang
patent: 4396304 (1983-08-01), Davenport
patent: 4407591 (1983-10-01), Adamoli
patent: 4502799 (1985-03-01), Weeks
patent: 4723854 (1988-02-01), Sakaida
patent: 4781477 (1988-11-01), Nagasawa
patent: 4895464 (1990-01-01), Rubinshtein
patent: 4944615 (1990-07-01), Kato
patent: 5013169 (1991-05-01), Ikehata
IBM Tech. Disclosure Bulletin; vol. 32, #9A "Acoustic Noise Reduction . . . " Feb. 1990.

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