| 摘要 |
In a vertical and helical banding machine having a rotary table, a carriage mounted on a mast secured to a stand is driven between upper and lower positions and has a delivery roller rotatable about a vertically stationary axis for passing the banding film to helically wrap or band the load. The carriage includes a support for changing the direction of banding film from a horizontal to a veritcal position as the film is delivered to the delivery roll. A prestretching mechanism is provided for prestretching the film prior to delivery to the carriage. The mechanism includes a horizontal vertically movable bearing roller carrying the film reel and a horizontal support roller parallel to the bearing roller and positioned beneath the film reel and supporting same whereby the lower horizontal generatrix between the reel of film and the support roller forms a constant reference to control the speed of film being unwound from the reel and in conjunction therewith acts as a prestretching mechanism.
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