| 摘要 |
<p>A traveling carriage adapted to carry an operative tool, such as a welding head, cutter, heat treater, etc., and to be guided in a working plane along a curvilinear profiled path, especially around a cylinder, by a guiding track such as a flexible steel band, having a forward guiding edge and a rear traction edge both parallel to the working plane. The carriage comprises a rigid frame and/or a rigid axle, perpendicular to that plane, with at least two subframes adapted to be adjusted angularly with respect to each other to fit various curvatures or radii of work pieces such as large pipes. Guiding elements, preferably rollers on the carriage for guiding the carriage by the track edges are spaced equidistantly from and on either side of said axle. At least two such guiding rollers run on the front track edge and at least one other track contact member is located between them, running on the other track edge; the apparatus is particularly adapted for welding pipe lines where high precision of movement and high dimensional integrity of the carriage must be maintained. The geometry required for maintaining precision operations for different curvature adjustments is set forth.</p> |
