| 摘要 |
PROBLEM TO BE SOLVED: To prevent a finger from being caught between rolls in reverse rotation of the rolls. SOLUTION: This safety device for controlling drive of two or more adjacent rolls to be used for conveyance and extension of a film material has a plurality of roll reverse rotation driving switches for relatively switching at least two rollers from normal rotation to reverse rotation at the same time, and at least two adjacent rollers can be driven after confirming safety. COPYRIGHT: (C)2009,JPO&INPIT
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