Sheet transporting
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Jun 18, 1996
filing date -
Jun 20, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
In a system for transporting film materials, 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 is a precision metal roll and the non-driven roll 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 the film to cause correction of slippage. Feed under uniform stress is achieved by forming a dancer roll film loop and correcting for differential alignment of the various transport rolls by displacing a portion of one side of the loop.
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