| 摘要 |
<p>A process and apparatus related to a workstation adjacent to a traveling web (12) including a device (10) for intermittently performing an operation affecting the web. An important application involves ultrasonically welding multiple layers of a traveling web (12). First and second rollers (30,32,34,36) on opposite sides of the workstation are simultaneously shifted in a direction counter to the machine direction each time a bonding force is applied. The overall running speed in the machine remains at a constant velocity due to the resultant festooning effect and thus the dwell time for bonding is increased. Thus the effective operating speed of processed having finite limits may be increased at least 33%. The first and second rollers (30,32,34,36) are eccentrically rotationally mounted, respectively, on third and fourth hollow rollers which are provided with eccentrically positioned hollow cylindrical openings which, in turn, are mounted, respectively, on shafts positioned perpendicularly to the machine direction. Shifting of the rollers (30,32,34,36) is effected by simultaneous rotation of the rollers. Preferably, the first (30) and second (32) rollers are driven synchronously in a first rotational direction and the third (34) and fourth (36) rollers are driven synchronously in the opposite rotational direction. <IMAGE></p> |
