| 摘要 |
PURPOSE:To improve processing efficiency and to reduce a processing time, by a method wherein a blade is turned over through the action of a rotary device and a lock mechanism each time outbound movement or inbound movement of a table is, and cutting surface is normally positioned facing the moving direction of the table for cutting. CONSTITUTION:Cutting is effected in a state that a cutting surface 32a of a blade 32 is positioned facing the forward moving direction of a table. When the cutting surface is moved to a switching point, a control device 40 outputs a signal to a switching valve 26 and a hydraulic pump 27. Working oil is fed to a cylinder chamber 23 of a lock device 20 through an oil port 23b, and a piston 24 is moved upward to disengage a dog 25a from on engaging hole 22a. A signal is outputted to a switching valve 18 and a hydraulic pump 19, working oil is fed to an oil chamber 16a of a rotary device 15 through an oil port 16c to rotate a drive shaft 17 and a support shaft 13 through a partition plate 17a. When the number of signals from an angle detector 41 amounts for a value equivalent to 180 deg., a signal is generated from the control device 40 again, and working oil is fed to a cylinder chamber 23 through an oil port 23a with the aid of a hydraulic pump 27. The piston 24 is lowered to engage the dog 25a with the hole 22a to stop rotation of the support shaft 17, and the cutting surface 32a is positioned facing a backward movement direction.
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