| 摘要 |
A package strapping machine is provided with a tape rolling up device for rolling up excess tape drawn off of a tape reel. A package is strapped by a thermoplastic tape being drawn off of the tape reel and looped around the package. The tape reel is fixed to a rotatably supported shaft. The tape rolling up device includes a friction member surrounding the shaft, and a spiral spring has an inner end connected to the friction member and an outer end connected to a fixed point. The shaft includes a surface contacting the friction member, so that when the tape is drawn off, rotation of the shaft causes rotation of the friction member and tightening of the spiral spring. If tape continues to be drawn off after the spiral spring is completely tightened, slip occurs between the friction member and the shaft contact surface to allow the additional tape to be drawn off. When excess tape is then generated by tape being fed back toward the tape reel by the package strapping machine, the spiral spring has an accumulated spring force to rotate the tape reel to wind the excess tape.
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