Package making – Methods – Applying a partial cover
Patent
1994-09-23
1995-10-24
Culver, Horace M.
Package making
Methods
Applying a partial cover
53589, B65B 1322, B65B 1304
Patent
active
054599776
ABSTRACT:
A novel method and apparatus for feeding and tensioning a strap in a power strapping machine. The apparatus includes a strap feeding mechanism, a strap tensioning mechanism, a pivoting roller carriage pivoted by a feeding and tensioning cam, strap overflow housing for receiving a strap that is prevented from properly feeding into a strap application assembly by an obstruction during feeding of the strap, and strap stretch-out housing for receiving a strap that is removed from the strap application assembly or the strap overflow housing during tensioning of the strap. The pivoting roller carriage first actuates the strap feeding mechanism to engage a portion of a strap and feed the strap toward the strap application assembly where the strap is formed in a loop about a package. The strap feeding and tensioning mechanism actuates a first gripper that secures an end of the strap in the strap application assembly. The pivoting roller carriage then actuates the strap tensioning mechanism to engage a portion of the strap and apply a tension to the looped strap. The strap will be fully retracted from the strap application assembly by the strap tensioning mechanism if the strap is not properly engaged by the first gripper, and the strap will then be directed into a strap stretch-out housing where it will remain until the strap feeding mechanism again engages a portion of the strap and re-feeds the strap toward the strap application assembly. The weight and position of the strap disposed in the strap stretch-out housing prevents the strap from withdrawing entirely from the strap feeding mechanism thereby ensuring that the strap feeding mechanism will automatically engage and re-feed the strap to the strap application assembly.
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Culver Horace M.
Illinois Tool Works Inc.
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