| 摘要 |
The present invention provides a screw tightening diagnostic device which can easily and reliably detect a state of incomplete screw tightening and can allow reliable screw tightening work to be performed. The screw tightening diagnostic device comprises rotational torque detection means for detecting that rotational torque occurring in a rotating shaft of an electric driver has reached a preset rotational torque within a predetermined time range past a minimum required screw-tightening time that has been set in advance according to the length of the screw being tightened, pressure force detection means for detecting that pressure force created by the electric driver pressing the screw when the screw is being tightened has reached a preset pressure force, and screw tightening diagnostic means for diagnosing that screw tightening has been performed in a normal manner when the rotational torque detection means detects that the preset rotational torque has been reached within the predetermined time range past the minimum required time and the pressure force detection means has detected the preset pressure force. |
