| CPC B21J 15/105 (2013.01) [B21J 15/04 (2013.01); B21J 15/12 (2013.01); B21J 15/26 (2013.01)] | 10 Claims |
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1. A power tool for a rivet nut, the power tool comprising:
a body;
a trigger disposed on the body;
a motor disposed in the body;
a shaft set disposed in the body, driven by the motor, and having
an axial direction;
a threaded spindle having at least one part extended out of the body to screw with the rivet nut; and
a connecting shaft connected to the threaded spindle to transmit a rotational driving force of the motor;
a ball screw mounted around the connecting shaft;
a position sensing module having
a first position-sensing element moved with the ball screw in the axial direction; and
at least one second position-sensing element located on a moving path of the ball screw to sense the first position-sensing element to confirm a position of the ball screw; and
wherein when the trigger is pressed, the motor is started, the threaded spindle pulls the rivet nut to be fixed on an object and withdraws from the rivet nut, and the ball screw moves to align the first position-sensing element with the at least one second position-sensing element to confirm that the ball screw returns to an original position, and the motor stops automatically;
a pre-fastening module having
a first pre-fastening detecting member moved with the connecting shaft in the axial direction; and
a second pre-fastening detecting member located on the moving path of the ball screw;
wherein when the threaded spindle is inserted into the rivet nut and is pressed to enable the connecting shaft to move inward the body, the first pre-fastening detecting member is moved to align with the second pre-fastening detecting member to automatically start the motor, the threaded spindle is rotated relative to the rivet nut by the motor, and the motor is automatically stopped after the rivet nut is pre-fastened on the threaded spindle.
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