Tool holder

A tool holder for holding a cutting tool, comprising:

• a housing defining a stepped hole at one end of the housing and a shouldered hole communicating with the stepped hole at the other end of the housing;
• a sleeve assembled in the stepped hole for receiving the cutting tool;
• a switch fastened in the shouldered hole for electrically connecting with a control system of a main spindle of a CNC turning machine to control the movement of the main spindle;
• and
• an elastic member sleeved on the sleeve, wherein the sleeve forms a shoulder at an end of the outer surface of the sleeve, the housing forms a first stepped portion at the inner surface of the housing corresponding to the stepped hole adjacent to the shouldered hole, the elastic member elastically resists between the shoulder and the first stepped portion, and the sleeve is slidably configured along the inner surface of the housing to contact the switch to stop the movement of the main spindle of the CNC turning machine;
• wherein the switch comprises a contact portion at one end thereof adjacent to the sleeve and a first electrical terminal and a second electrical terminal at the other end thereof, and the first electrical terminal and the second electrical terminal are electrically connected to the control system of the main spindle.

A tool holder for holding a cutting tool, comprising:

• a housing;
• a sleeve movably assembled in one end of the housing for receiving the cutting tool;
• a switch fastened in the other end of the housing for electrically connecting with a control system of a main spindle of a CNC turning machine to control the movement of the main spindle;
• a fastening member firmly sleeved on the switch and adhered to an inner surface of the housing;
• and
• an elastic member sleeved on the sleeve and received in the housing, wherein the elastic member is compressed to elastically resist with the sleeve and generates an elastic force to make the sleeve to move away from the switch, and the sleeve is slidably configured along the inner surface of the housing to compress the elastic member and contact the switch to stop the movement of the main spindle of the CNC.