| 摘要 |
An apparatus for application of zippers to film material (10) comprises an applicator bar (22) for presenting pre-cut lengths of zipper (25) to the fil m and a heated sealing bar (34) for sealing the pre-cut lengths to the film. T he applicator bar, the sealing bar, feed rollers (30a, 30b) and a zipper cutter (32) are mounted for movement with the film on a linear motor (14). A pneumatic cylinder (18) raised the application bar towards the film (10). Th e applicator bar moves .in direction C to apply the zipper to the film (10) moving in direction A, then moves with the sealing bar and the film in direction B, away from the film in direction C~, back to its starting positi on in direction B~, then towards the film again in direction C. A further lengt h of zipper may be fed to the applicator bar at any time after the bar has mov ed away from the film in direction C~ and therefore during an end portion of th e forward stroke of the motor, or during its return stroke. |
