| 摘要 |
The connecting device (6) comprises a soft, easily deformable and resilient material and the drive device(7) for moving the cloth (4) is formed by a hose tightly fitted around the connecting device so that any unevenness on the external surface of the drive device can be compensated for. The elongated drive device is designed to be moved in its length direction and if the force being applied to the cloth by this device exceeds a given limit, the connecting device slips relative to the drive device.
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