PULVERIZING DEVICE WITH BACKWARD ROTATING CUTTER BLADE

摘要

PURPOSE:To efficiently pulverize a supply material with small-sized motors by constituting the device in such a manner that the torque sensor of a control means detects the rotating torque of cutter shafts and rotates cutter blades backward when the rotating torque attains a set value or higher so as to prevent stopping of the cutter shafts by overloading at the time of nipping off the supply material. CONSTITUTION:The control means 14 controls a driving means 2 to rotate motors 7 backward and to rotate motor shafts 1 backward when the current sensor of the torque sensor 13 detects the current of the set value or above. Further, the cutter blades 4 are provided with forward rotating blades and backward rotating blades. The supply material is pulverized with the forward rotating blades by rotating the cutter shafts 1 forward, and with the backward rotating blades at the time of rotating the cutter shafts backward. The relative postures of the supply material with the cutter shafts 1 change and the supply material is efficiently cut by the overloading cutter shafts 1 if the pulverizing positions of the supply material are changed by rotating the cutter shafts 1 forward and backward in such a manner. The small-sized motors which cannot rotate the overloading cutter shafts 1 are, therefore, usable for the pulverizing device with the backward rotating cutter blades.