PURPOSE: To remove trouble due to the difference between pass lines by a method wherein flexible tables are installed between the rear table and the running truck and carried substances are supported by two points to enable different heights at both ends to be adjusted.

CONSTITUTION: If a long pipe that has been electroseamed at a fixed speed is set on the cutter 10 of the running truck 10, it will be formed into fixed length pipes when it is running a given running stroke R. At the while, the flexible roller table 30 can expand or contract according to a running stroke and carry the fixed length pipes without fail to the rear table 20. In the middle between the rear table and the running truck, the height changes automatically and in a straight line to allow the pass line to be changed freely.