Reciprocating tool

A reciprocating tool, characterized in that the reciprocating tool comprises:

• a drive motor including a motor gear at one end of the drive motor;
• a drive shaft which is rotated by the motor gear and extends along an axial direction, the drive shaft is provided with a ball rolling groove which is in the form of a rotary closed loop formed around the front end shaft, an extending direction of the ball rolling groove includes a component vector along the axial direction and a component vector around the front end shaft;
• a driven shaft which is composition of a connecting end and an insertion section, the connecting end to connect a tool, the insertion section includes an inner round operation recess, the drive shaft is inserted into the inner round operation recess and capable of rotating respect to the insertion section, the insertion section with at least one positioning surface on outer surface, and the insertion section with a ball hole;
• a sliding member disposed into the ball hole and the ball rolling groove, when the drive shaft rotates, the sliding member will move along the ball rolling groove;
• an annular fixing member, with at least one restricting surface on inner round surface, the annular fixing member is sleeved onto the insertion section of the driven shaft, and the restricting surface is abutted against the positioning surface;
• and
• a shell which is used to accommodate the drive motor, the drive shaft, the driven shaft, the sliding member, and the annular fixing member;
• by means of swing arm, rotation of the drive shaft can cause movement of the sliding member along the ball rolling groove, so that the driven shaft is driven to move back and forth repeatedly along the axial direction.