Typewriting machines – Means auxiliary to typewriting function – Means for muffling typewriter noise
Patent
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.
Matsukura Hiroyuki
Yamauchi Fumio
Burr Edgar S.
Eckstine Tonya
NEC Corporation
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