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