| 摘要 |
An apparatus for use with a strapping machine for displacing and tensioning a strapping band about an article or the like, wherein band rolls, about which there is wrapped the strapping band, are operatively coupled with a reversible drive motor, and between the drive motor and at least one of the band rolls there is provided a speed reduction stage which is switched-on, due to the response of an overload coupling, during the rotational sense corresponding to tensioning of the strapping band. According to the invention, three successive band rolls are provided which are coupled with one another for carrying out the same peripheral rotation by means of a form-locking transmission or drive. During the rotational sense or direction, corresponding to the feed direction, the transmission or drive elements associated with the first and the third band rolls form a step-up transmission for the transmission or drive element of the intermediate band roll, whereas with a rotational sense corresponding to tensioning of the band the transmission element of the intermediate band roll is capable of being coupled direct with the drive motor by means of a freewheeling coupling, which blocks in response to the overload coupling, through the agency of the speed reduction stage.
|
