Impact rotation tool and impact rotation tool attachment

An impact rotation tool attachment that is attachable to an impact rotation tool, wherein the impact rotation tool includes an impact force generation unit configured to generate impact force for converting power from a drive source to pulsed torque, a shaft arranged to transmit the pulsed torque to a bit used to perform a tightening task, and a controller configured to control the drive source, the attachment comprising:

• a torque measurement unit configured to measure torque applied to the shaft as a measured torque;
• a rotation angle measurement unit configured to measure a rotation angle of the shaft;
• and
• a tightening torque calculation unit configured to calculate an angular acceleration from the rotation angle to calculate a tightening torque based on the angular acceleration and the measured torque.

An impact rotation tool comprising:

• a drive source;
• an impact force generation unit configured to generate an impact force for converting power from the drive source to pulsed torque;
• a shaft arranged to transmit the pulsed torque to a bit used to perform a tightening task;
• a first measurement unit configured to measure torque applied to the shaft as a measured torque;
• a second measurement unit configured to measure at least one of acceleration in a circumferential direction of the shaft and an angular velocity of the shaft;
• a torque computation unit configured to calculate a tightening torque from the measured torque of the first measurement unit and an inertial torque of the shaft and the bit obtained with a measured value of the second measurement unit;
• and
• a controller configured to control the drive source based on the tightening torque.

An impact rotation tool attachment that is attachable to an impact rotation tool, wherein the impact rotation tool includes an impact force generation unit configured to generate impact force for converting power from a drive source to pulsed torque, a shaft arranged to transmit the pulsed torque to a bit used to perform a tightening task, and a controller configured to control the drive source, the attachment comprising:

• a first measurement unit configured to measure torque applied to the shaft as a measured torque;
• a second measurement unit configured to measure at least one of an acceleration in a circumferential direction of the shaft and an angular velocity of the shaft;
• and
• a torque computation unit configured to calculate a tightening torque from the measured torque of the first measurement unit and an inertial torque of the shaft and the bit obtained with a measured value of the second measurement unit,
• wherein the torque computation unit is configured to output to the controller at least one of the calculated value of the tightening torque and a control signal of the drive source generated based on the calculated value of the tightening torque.