Typewriting machines – Means auxiliary to typewriting function – Means for muffling typewriter noise
Patent
1991-10-28
1992-12-29
Burr, Edgar S.
Typewriting machines
Means auxiliary to typewriting function
Means for muffling typewriter noise
248638, 101 9348, B41J 1904, B41J 2910
Patent
active
051746719
ABSTRACT:
A printing device including a print hammer having a noise dampener for use with an impact printer mechanism. The print hammer has a significant mass for impacting a character pad against an ink ribbon, paper and a platen. In a first embodiment the print hammer includes an acoustic noise dampening layer interposed between a mass weight and the hammer face which carries the anvil that impacts during printing. In other embodiments the print hammer is formed in two parts. One part having a weighted mass and the other part being pivotally coupled to the printer mechanism. The two parts are structurally joined together by a noise dampening member. Transmission of acoustic noise during impact printing through the hammer is reduced.
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patent: 4318452 (1982-03-01), Reitner
patent: 4327639 (1982-05-01), Crystal et al.
patent: 4754827 (1988-07-01), Hirabayashi
patent: 4987679 (1991-01-01), Rau
"Acoustic Isolation of a Print Hammer Head from a Print Hammer Body" IBM Technical Disclosure vol. 28 No. 10 Mar. 1986.
Anderson, Jr. Donald G.
Pawlak Stephen M.
Rimbey Roger J.
Burr Edgar S.
Hendrickson Lynn D.
Smith Corona Corporation
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