Low-noise type impact printer

Details Low-noise type impact printer Low-noise type impact printer

1985-04-01

1987-01-13

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Means for muffling typewriter noise

181201, B41J 2910, B41J 2908

Patent

active

046361014

ABSTRACT:
The noise level of an impact printer is reduced by at least 5 dB by providing a resonant absorption chamber between the printer frame and the cover which is designed so as to have a resonance frequency corresponding to the fundamental frequency of the printer noise.

REFERENCES:
patent: 1234086 (1917-07-01), Powers
patent: 1542924 (1925-06-01), Waldheim
patent: 2702244 (1937-03-01), Courson
patent: 3308919 (1967-03-01), Cunningham
patent: 4135830 (1979-01-01), Hishida et al.
IBM Technical Disclosure, vol. 25, No. 11A, Apr. '83, "Machine Covers with Integral Internal Surface Absorption", Gaunt and Lanham.

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