| 摘要 |
A vacuum actuated guide and tension control system for use in a corrugated paperboard manufacturing plant or the like. The vacuum actuated guide includes a smooth paper contacting surface having a plurality of spaced openings through which a vacuum is imposed upon a sheet passing thereby. The guide, acting upon paper which is being unwound from a roll, or otherwise being operated upon during movement, urges the paper into frictional pressure contact with the perforated smooth surface. The tension placed upon the paper is controlled automatically by varying the amount of negative pressure to which the paper is subjected. In the event of a paper break or other unexpected happening, the operator can actuate a switch and instantaneously terminate the vacuum enabling an instant shutdown of the machine and correction of the problem.
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