Typewriting machines – Means auxiliary to typewriting function – Means for muffling typewriter noise
Patent
1989-08-31
1990-07-24
Burr, Edgar S.
Typewriting machines
Means auxiliary to typewriting function
Means for muffling typewriter noise
181201, B41J 2910
Patent
active
049431730
ABSTRACT:
A printer has a feeding path for guiding a printing paper from and toward an opening of the printer. A cross-sectional shape of the feeding path is minimized to be sufficient to pass the printing paper through the feeding path. At least one resonator is arranged in the feeding path. The resonator has a case defining a resonant chamber and holes formed on the case along with the feeding path. The resonant chamber communicates with the feeding path through the holes. Noises such as impact sound generated by a printing head of the printer are silenced by the resonator at frequencies around a resonance fequency of the resonator, and further silenced by the area reduced portion of the feeding path.
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Gaunt et al., "Machine . . . Absorption", IBM Technical Disclosure Bulletin, vol. 25, No. 11A, p. 5490, 4-83.
Harada Shigeyoshi
Nitta Yukami
Okazaki Yoji
Burr Edgar S.
Kabushiki Kaisha Toshiba
Keating Joseph R.
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