| 摘要 |
<p>Device to control the feeding of the strap in a strapping machine, comprising at least one fast driving wheel (4) and one slow driving wheel (2) which are mounted on fixed axes, the strap (R) being guided on the periphery of both said driving wheels, and wherein pressure means (5 and 14) are provided to press the strap (R) against the periphery of one and/or the other of said driving wheels, so as to ensure feeding thereof, said pressure means being mounted on an oscillating sector (8) which is operated in response to tensioning of the strap; on said oscillating sector (8) there is also mounted a strap transmission wheel (13), located at a distance from said pressure means, which imparts on the oscillating sector (8), according to the tension of the strap (R), an oscillation such as to transfer the contact pressure of the strap from the fast driving wheel (4) - for the fast recovery step - onto the slow driving wheel (2) - for the slow tightening step - merely through the alternative action of said pressure means. <IMAGE></p> |
