| 摘要 |
A prestretch roller assembly for a film delivery system includes upstream and downstream prestretch drive rollers for engaging and stretching a stretch film web. The web extends around an upper portion of the upstream drive roller and thence directly to a lower portion of the downstream drive roller, to form a generally S-shaped path. The downstream drive roller is rotatably mounted on a stationary frame, and the upstream drive roller has one end rotatably connected to the stationary frame and a second end rotatably connected to a swing frame. An upstream idler roller is rotatably mounted on the stationary frame upstream of the upstream drive roller, and a downstream idler roller is rotatably mounted from the swing frame downstream of the downstream drive roller. The axes of all four rollers are coplanar when the swing frame is moved to a closed position.
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