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Acoustically Dampened Print Hammer

IP.com Disclosure Number: IPCOM000045864D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Applegate, JP: AUTHOR

Abstract

The fabrication of a print hammer, where the solenoid or magnet acts daisy print element, requires rigidity as well as a relatively low mass. With the impacting of the magnet against the hammer and the further secondary impact at the point of printing, acoustics enter into the considerations for fabrication and structure. In order to secure as light a weight structure as possible while at the same time reducing undesirable noise, the hammer structure 10 is formed in a stamped or drawn channel, more clearly illustrated in Fig. 2. The hammer 10 is drawn to a sufficient depth to provide the desired rigidity and then filled with a dampening material such as a rubber or foam 12. The acoustic dampening material, 12 will act to reduce the effect of the impact of the solenoid against the hammer 10.

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Acoustically Dampened Print Hammer

The fabrication of a print hammer, where the solenoid or magnet acts daisy print element, requires rigidity as well as a relatively low mass. With the impacting of the magnet against the hammer and the further secondary impact at the point of printing, acoustics enter into the considerations for fabrication and structure. In order to secure as light a weight structure as possible while at the same time reducing undesirable noise, the hammer structure 10 is formed in a stamped or drawn channel, more clearly illustrated in Fig. 2. The hammer 10 is drawn to a sufficient depth to provide the desired rigidity and then filled with a dampening material such as a rubber or foam 12. The acoustic dampening material, 12 will act to reduce the effect of the impact of the solenoid against the hammer 10. The surface or element for impacting the type element may be attached on tab 14 by attaching means 16.

The lightweight hammer fabricated by drawing or stamping of the relatively thin material is advantageous, while the acoustic dampening material 12 overcomes some of the inherent ringing tendencies of drawn metal structures upon impact.

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