This is intended as a substitute for the simap rotation center of various shelves, center the material itself is moved back and forth by simply configured to taper cutting can be of any length and taper cutting, and moved back and forth one wishes to maximize the workability can provide a substitute simap rotation center. ; That is, the present is designed for high-portion 12 and the cutting edge portion 12 is bearing (13a) which support the coupling which is fixed shaft portion 11 and the other side of the material (M) to the tail stock (4) of the shelf (1) to one side in the rotation center (10) having means to rotate the supporting freewheel 13 is, further configured Enhanced portion 12 is movable back and forth ever before and after the moving means (20) to the rotation center 10, the mobile before and after the means 20 is moved, and upper and lower inclined surfaces 26, 27 are formed by the slider 21 and the upper and lower slider 21 is placed is the bag portion 11 is to the back and forth movement when guiding an integrally formed back and forth by fixing means 24 such as the guide surface 29 is provided with a seating jaw (28) formed integrally with the guide plate 22 and the slider 21 located on the upper guide plate 22 on the side opposite to the wrench bolt is composed of a combined slider 21 thereby fixing the pressing pressure fixed to the lower surface 32 to form a fixing protrusion 31 is formed, the fixture (23). ; as described above, the present invented a second device before and after the moving means (20) on the rotation center 10, the bag portion coupled integrally with the slider 21 to cause the slider 21 is moved back and forth in the fixed guide plate 22 integrally with the 11 a fixed rotation means 13 and its bearing (13a) can be tapered cutting the tip ends of the support 12 to be movable back and forth by ever material (M) material, regardless of the length of the length and the taper of the (M) and , center, and can be replaced only by the taper of the cutting (6), the configuration is simple and is easy to manipulate a large number of effects that can be expected to maximize work efficiency.
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