Patent ID: 9561671
Date: 2017-02-07
CPC Classifications: B41J,B65H

Claim:
1. A dual drum vacuum sheet transport apparatus, comprising: a first drum, said first drum having a first pattern of first vacuum holes; a second drum, said second drum having a second pattern of second vacuum holes; and a controller electrically connected to said first drum, said second drum is positioned coaxially with respect to said first drum, said first drum contacts sheets to be transported, when transporting said sheets on said first drum separated by spaces between said sheets, said first drum and second drum move together, and when not transporting said sheets, said controller controls said first drum to rotate relative to said second drum to move said first drum relative to said second drum so as to leave blocked-hole regions of said first drum where said spaces between said sheets are located, said blocked-hole regions are locations of said first drum where said first vacuum holes are unaligned with said second vacuum holes and said first vacuum holes are blocked by said second drum.