| 摘要 |
<p>An apparatus for forming a plurality of an annular non-helical corrugations in a cylindrical tube has two generally parallel shafts that can be displaced toward and away from each other and that are driven oppositely and synchronously by a common main drive. A central roller disk is fixed on one of the shafts and a pair of axially displaceable outer disks flank this disk on the one shaft. A pair of axially displaceable roller disks are provided on the other shaft each lying between a respective one of the outer disks of the one shaft and the central disk. Respective threaded spindles adjacent the shafts threadedly engage the respective displaceable roller disks and these spindles are threaded such that when rotated in one rotational sense the respective disks move axially together and vice versa. A pair of summing transmissions each have an output connected mechanically to the respective spindle, a first rotary input connected to the main drive, and a second rotary input connected to a secondary drive so that the spindles can be rotated at a rate determined by the rotation speeds and directions of the two respective inputs.</p> |
