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Acoustical Damping System for Printers

IP.com Disclosure Number: IPCOM000042825D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Varhma, R: AUTHOR

Abstract

In printers, paper web 10 moves along a curved path from the print station to a collection station where it is folded into a stack. The taut paper web 10 acts as a clamped thin plate which, when impacted by printer hammers 11, produces an array of nodal vibrations both in the lateral and longitudinal directions. Vibration waves generated by hammer impacts travelling along the web 10 radiate noise into the surrounding air mass particularly in the region under where web 10 bends or is curved as it moves along a guide structure 12 beneath the cover 13 of the printer housing. An acoustical damping system comprises a damping chamber 14 located below web 10 in the region of the bend.

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Acoustical Damping System for Printers

In printers, paper web 10 moves along a curved path from the print station to a collection station where it is folded into a stack. The taut paper web 10 acts as a clamped thin plate which, when impacted by printer hammers 11, produces an array of nodal vibrations both in the lateral and longitudinal directions. Vibration waves generated by hammer impacts travelling along the web 10 radiate noise into the surrounding air mass particularly in the region under where web 10 bends or is curved as it moves along a guide structure 12 beneath the cover 13 of the printer housing. An acoustical damping system comprises a damping chamber 14 located below web 10 in the region of the bend. Chamber 14 consists of an inverted rectangular hood or box 15 with a cover comprising a perforated half hexagonal metal paper guide 16 with a perforated acoustical liner
17. Box 15 has acoustical liner 18. Both liners 17 and 18 as well as acoustical liner 19 on cover 13 are preferably made of a foam material, such as polyurethane. Noise radiated from the bend of web 10 enters chamber 14 through perforated guide 16 and liner 17, and is trapped and absorbed by liners 17 and 18.

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