| 摘要 |
Apparatus and methods for applying flexible straps around objects include a feed and tension unit a feed drive wheel and a feed pinch wheel, a primary tension drive wheel and a primary tension pinch wheel, and a secondary tensi on drive wheel and a secondary tension pinch wheel, wherein at least one of the pinch wheels is controllably biased against the respective drive wheel by a solenoid that is controlled in two stages: a first stage that provides a ful l feed or tensioning force and a second stage that provides a reduced feed or tensioning force by altering the pulse width modulation of the solenoid. In another embodiment, the three sets of wheels of the feed and tension unit ar e configured to provide a simplified "V-shaped" strap path that reduces bendin g of the strap, thereby reducing friction and consequent feeding difficulties. In another embodiment, the feed and tension unit includes inner and outer guides that form a strap channel through the feed and tension unit to provid e easy access to the strap path for clearing the strap path in the event of a jam. In another embodiment, a track assembly includes a plurality of section s providing modularity of construction. Each section includes a backplate attached to at least one support member, and a slotted cover pivotably attached to theat least one support member proximate the backplate and moveable between an open position spaced apart from the backplate and a clos ed position proximate the backplate. In another embodiment, a cutting assembly for severing strap material includes a press platen and a cutter having a first cutting blade along a first edge thereof and a second cutting blade along a second edge thereof, the cutter being removably and variably engaged to the press platen.
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