| 摘要 |
PURPOSE: To suppress the overshoot of torque by detecting the torque every angle rate at the deceleration of a tool in a fastening work, and regulating the tool speed so as to precisely keep the torque in higher torque rate work while keeping the speed in lower torque rate work. CONSTITUTION: An analog signal from a torque transducer 26 provided on a power tool is applied to a controller 104, and when it reaches a target value, a control signal for stopping a motor 16 is transmitted from the controller 104 to a servo amplifier 90. At this time, when the torque measured by the transducer 26 reaches a down shift torque point, the controller 104 counts the number of the tool spindle rotation or angle from the output of a resolver 24, and when it reaches the level of a second torque point, the counted angle is compared with values of down shift hard and medium angles. The tool speed is regulated so as to precisely keep the torque in a higher torque rate work while keeping the speed in a lower torque rate work. |
