Patent ID: 9669641
Date: 2017-06-06
CPC Classifications: B41J

Claim:
1. A vacuum platen for media sheets, said vacuum platen comprising: a sheet support wall formed with a plurality of perforations and a sheet supporting surface; and a number of chambers formed on a bottom side of the sheet support wall, wherein each of said number of chambers is to in fluid communication with a vacuum source and the plurality of perforations, wherein each of said number of chambers contains an acoustic barrier member arranged to divide the chamber into at least two sub-chambers such that the at least two sub-chambers are in fluid communication with one another, and wherein the acoustic barrier member extends at an acute angle to a direction normal to the sheet supporting surface of the sheet support wall, such that a height of each sub-chamber, as measured in the direction normal to the sheet support wall, varies over a width direction of the chamber to reduce acoustic resonance oscillations from being excited in the at least two sub-chambers during operation.