Patent ID: 7735636

Claim:
An arrangement for guide rail adjustment on a conveyor, the arrangement comprising: at least one set of guide rails, a plurality of sets of mounting elements, which each support at least one moveably suspended guide rail, and means for simultaneous individual adjustment of said sets of mounting elements, the means permitting simultaneous adjustment of the position of the guide rails moveably supported by the mounting elements, wherein said means for simultaneous adjustment of said plurality of sets of mounting elements comprises a plurality of synchronous or stepping motors, which are fed from a common voltage source; wherein at least one of the sets of mounting elements comprises a translator to translate the rotational motion of the synchronous or stepping motor into a linear motion of at least one moveably supported guide rail arranged on each mounting element, the translator comprises an externally threaded rod engaging with an internally threaded cylinder arranged on a guide rail mount, the rotation of said rod being translated into a linear motion of the guide rail mount, wherein said rod has a first portion having a screw thread turning in one direction and a second portion having an opposite-handed screw thread and that each portion engages with each internally threaded cylinder arranged on each guide rail mount, the rotation of said rod being translated into a linear motion of the two guide rail mounts in opposite directions to one another, and wherein said common voltage source is to deliver a first feed voltage with a first phase for driving the synchronous or stepping motors in a first direction of rotation and to deliver a second feed voltage with a second phase to drive the synchronous or stepping motors in a second direction of rotation.