| 摘要 |
<p>A sheet transportation apparatus includes at least one beltless vacuum transport (BVT) that has a plurality of adjacent rollers. Each of the rollers comprises a rounded external surface and an axis about which the external surface rotates. The external surfaces of the rollers are spaced from each other by gaps referred to as "inter-roller spaces." A fan is positioned on a first side of the rollers. The fan draws air through the inter-roller spaces to create a vacuum force on a second side of the rollers. The vacuum force maintains the sheets of media in contact with the second side of the rollers. The external surface of each of the rollers comprises a plurality of first regions having a first diameter and a plurality of second regions having a second diameter different than the first diameter. The first regions and the second regions of the external surface are adjacent one another and alternate along the length of the external surface of each of the rollers.</p> |
