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Browse Prior Art Database

Noise Reduction Feature for Typewriters

IP.com Disclosure Number: IPCOM000084648D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Irving, WF: AUTHOR [+2]

Abstract

When the type element of a single-element typewriter impacts the ribbon and paper to effect the printing, the impact noise generated tends to radiate outwardly from the head in unconfined directions. In those directions where there is an obstacle to the free radiation of the noise it is either redirected or absorbed, and thus diminished in those regions which are sheltered by the typewriter structure.

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Noise Reduction Feature for Typewriters

When the type element of a single-element typewriter impacts the ribbon and paper to effect the printing, the impact noise generated tends to radiate outwardly from the head in unconfined directions. In those directions where there is an obstacle to the free radiation of the noise it is either redirected or absorbed, and thus diminished in those regions which are sheltered by the typewriter structure.

It has been found that substantial noise reduction on single-element printers may be effected at the end positions or those positions on lines extending substantially outwardly from the platen, by the insertion of earmuffs or noise absorbing members onto the print carriage and on a line parallel to the axis of the platen. These absorbing members may be formed of any convenient material which may be attached to the carrier. The members are filled with an acoustical absorbing foam to attenuate the impact noise created by the typehead, as well as the other noise emanating from the carrier area 14.

Acoustical earmuffs or absorbing members 10 may be observed on carrier
12. The acoustical attenuator 10 is filled with a foam material 16 which will absorb noises in the desired (high) frequency ranges.

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