| 摘要 |
PURPOSE:To improve the shearing accuracy by providing a material passage detecter at the position where the passage of a material to be sheared can be detected after the acceleration of a flying shear is finished and directly recognize a material position before shearing for adjusting the rotating speed of a shear and correcting the tracking error of the material. CONSTITUTION:A contact A is closed so that a reference rotating speed is inputted into the speed controller 12 of a motor 7 for driving a shear while a flying shear 15 is started so that a rotary drum 5 is rotated. With the advance of a material 1 to be sheared, the tip 1T of the material 1 is detected with a second detecter 9 and at this time the position of a shering blade 6 on the rotary drum 5 is read. At the same time the correcting speed V in the reference rotating speed of the motor 7 is calculated by the specified expression for closing the contact B. The signal of the correcting speed V in the reference rotating speed is outputted from the controller 12. In order that the timings when the blade 6 and the shearing position of the material 1 reach the shearing point PB respectively are coincident with each other, the reference rotating speed is corrected with the correcting speed V so that it is possible to improve the shearing accuracy.
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