PURPOSE: To draw a long size raw material M having a deformed cross section, of which thickness is changed partially, without lowering the drawing force and without giving a damage to the raw material M.

CONSTITUTION: An upper side belt conveyor 2 is divided into plural numbers, and each divided upper side belt conveyors 3, 3 are supported by an upper side fixing frame 5, which can be moved vertically, under the condition that they can be oscillated around of a gravity thereof and that they are pushed downward by a small force, of which dead weight is offset by the work of a fluid cylinder 26.