| 摘要 |
A web conveyance system is provided for conveying a web that has first and second edge portions and a central portion disposed between the first and second edge portions. The web conveyance system has means for engaging the first and second edge portions of the web and maintaining the central portion of the web free of contact with the means. Preferably, the means comprises a roller with left and right end portions and an undercut middle portion. The end portions of the roller engage side edge portions of the web for conveyance while the middle portion of the web and roller remain free of contact with the roller.
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