| 摘要 |
<p>An edge folder by means of which the edge of a wrapping material wound around a cylindrical object, usually around a paper roll, is folded against the end of the roll. In the device in accordance with the invention, the folding takes place by means of pressing means (3) attached to an endless chain (1), which pressing means (3) are mounted to the chain (1) by means of articulated joints (4) so that the pressing means (3) can pivot freely to a relative angle of movement determined by the circumferential velocity of the roll (7) and the speed of movement of the chain (1). The roll (7) is rotated and, at the same time, the edge folder is pressed against the end of the roll (7) and the chain (1) is operated so that its direction of movement is from the circumference of the roll (7) towards the centre. Thereby the pressing means (3) perform the folding of the edge (12) of the wrapping material against the edge of the roll (7). When rolls (3) freely revolving around their shafts are used as pressing means, the pressing means perform exclusively a rolling movement along the edge of the wrapping material and along an end sheet positoned at the end of the roll (7), and thereby all rubbing and drawbacks resulting from such rubbing are avoided. The number of edge folders of the type described above is preferably two, one at each side of the roll (7), and they are preferably placed between the roll-rotating rollers (11).</p> |
