Patent ID: 6043571
Filing Date: 2000-03-28
Classification: B29C

Abstract:
Linear-motor-driven transport installation, in particular a linear-motor-driven simultaneous stretching installation, in which linear-motor-driven carriages or tenter-clip carriages are advanced on a circulating track, drive devices for the carriages or tenter-clip carriages being provided, in particular for braking, on a return section between a running-out zone and a running-in zone, characterized in that the return section has at least three zones, namely, seen in the running direction, a first speed-changing zone, a following transporting zone and a subsequent braking zone, the length of the speed-changing zone and the braking zone together being less than 40% of the overall length of the return section, and in that in the speed-changing zone and/or braking zone more powerful drive devices are provided in comparison with the other part of the return section, in order to subject the carriages or tenter-clip carriages there to a more intense change in speed, wherein mechanical or contactless eddy-current brakes are provided as an alternative or in addition to linear motors in the speed-changing zone and/or braking zone, and wherein the eddy-current brake comprises a stationarily fitted permanent magnet or electromagnet which interacts with braking elements made of electrically conducting and/or ferromagnetic material which are fastened to the carriage.