Method of and apparatus for wrapping a stack of objects with a film
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United States of America Patent
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Jun 4, 2013
Grant Date -
Jun 23, 2011
app pub date -
Dec 20, 2010
filing date -
Dec 21, 2009
priority date (Note) -
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Abstract
An apparatus for wrapping a stack of objects with a film has first and second supplies of films and a pull-down device shiftable vertically along the stack of objects. A film-feed head has a drive roller rotatable about an axis in the film feed head and first and second pairs of counterrollers angularly offset from each other relative to the drive-roller axis. The drive roller and the pairs of counterrollers are relatively shiftable between end positions in each of which one of the pairs is spaced from the drive roller and the other pair is engaged with the drive roller. The first and second films pass between the respective first and second pairs and the drive roller. An actuator can shift the first and the second pairs of rollers relative the drive roller for pinching the films against the drive roller and, on rotation of the drive roller.
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