Drive device for a transverse drawing system for films of synthetic material
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United States of America Patent
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-
Jan 29, 2008
Grant Date -
Aug 17, 2006
app pub date -
May 27, 2004
filing date -
Jun 2, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to drawing systems using a series of jaws for the support, transport and drawing of the film (2), which are supported and guided by rails and driven by endless chains (3), connecting the jaws between the above. Each chain (3) is driven by two toothed wheels (6,7) of large diameter (D), one wheel (6) located at the beginning of the forward run (4) and the other wheel (7) located at the rear end of the return run (5) of the chain (3). Each wheel (6,7) is provided with motorised rotational drive means, said means being synchronised with each other. Such a drive device finds application in high speed drawing machines.
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