| 摘要 |
PURPOSE: To move a power transmission element with a little friction by locating the power transmission elements in such a manner that its longitudinal slit is limited and the elements are opposite to each other, supporting and guiding it on a casing in an area of side wall of a casing in both sides by direct drive rolling bearing. CONSTITUTION: A power drive element 13 is movably guided in longitudinal direction and is supported in casing 1. The nearly rectangular power drive element 13 is formed following slide type of a direct drive bearing, has two slide saddle elements, each has nearly T shaped cross section, and a part 15 of it is plunged into a longitudinal slit 9 of a forming pipe. The side wall of the trapezoid shaped part 15 is extending parallel, with an interval, to the adjacent wall 11 of the casing and supports a ball rolling orbit 16 that is respectively longitudinally extending. Linear ball rolling orbit 17 corresponding to the orbit 16 is arranged in each area of two casing walls 11. A line of balls roll on each of the ball rolling orbits 16, 17. |
