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Acoustic Isolation of a Print Hammer Head From a Print Hammer Body

IP.com Disclosure Number: IPCOM000060214D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Vitek, EJ: AUTHOR

Abstract

The sound level of a print hammer is reduced by introducing dampening material between a print hammer head and a print hammer body with the dampening material producing a non-stiff connection between the print hammer head and the print hammer body to attenuate vibration of the print hammer body. A dampening material 1 is disposed between a print hammer head 2, which is formed of metal, and a print hammer body 3, which is formed of plastic. The dampening material 1 may be any suitable elastomer such as urethane, for example. The dampening material 1 should have a much lower melting point than the print hammer body 3 to be used with an injection molding process. The print hammer head 2 may have additional dampening material 4 therein in its tip portion. The dampening material 4 could be brass, for example.

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Acoustic Isolation of a Print Hammer Head From a Print Hammer Body

The sound level of a print hammer is reduced by introducing dampening material between a print hammer head and a print hammer body with the dampening material producing a non-stiff connection between the print hammer head and the print hammer body to attenuate vibration of the print hammer body. A dampening material 1 is disposed between a print hammer head 2, which is formed of metal, and a print hammer body 3, which is formed of plastic. The dampening material 1 may be any suitable elastomer such as urethane, for example. The dampening material 1 should have a much lower melting point than the print hammer body 3 to be used with an injection molding process. The print hammer head 2 may have additional dampening material 4 therein in its tip portion. The dampening material 4 could be brass, for example. If desired, the dampening material 1 could terminate at the edge of the print hammer body 3 rather than extending therebeyond to partially surround a portion 5 of the print hammer head 2 extending beyond the print hammer body 3. If desired, the dampening material 1 could be an annular sleeve surrounding a portion 6 of the print hammer head 2. In this arrangement, the annular sleeve of the dampening material 1 would preferably have a larger diameter than the diameter of the portion 5 of the print hammer head 2 so that the print hammer head 2 would abut the dampening material 1. The dampening materi...