| 摘要 |
<p>In a system for transporting film materials (12), rotation of the transported film caused by uneven stress across a width of the film is eliminated by providing a pinch roll drive in which the driven roll (70) is a precision metal roll and the non-driven roll (72) is a rubber roll, the outer cylindrical surface of which is defined by a plurality of axially-spaced annular ribs. Accumulated error is removed at regular intervals by braking (132) the film to cause correction of slippage. Feed under uniform stress is achieved by forming a dancer roll (64) film loop and correcting for differential alignment of the various transport rolls by displacing a portion of one side of the loop.</p> |
