Device for the quick change of tool holder adapters

A device for the quick change of a tool holder adapter for use on CNC machine tools having a motorized module with a rotating shaft, the rotating shaft having a back wall with a recess defining a tapered seat, the device, comprising:

• a tool holder shank having a truncated-cone shape body with a front end and a rear end, the front end having a diameter greater than a diameter of the rear end, the rear end configured to be received into a complementary housing of the rotating shaft of the motorised module, wherein a rear face at the rear end of said tool holder shank of the truncated-cone shape includes a milling cut configured to accommodate at least one removable insert;
• wherein the removable insert defines a lozenge configuration with rounded edges and extends diametrically into the milling cut of the tool holder shank, the removable insert protruding partly frontally in a direction of the recess formed on the back wall of the rotating shaft of said motorized module;
• and
• wherein the removable insert is provided with one or more through holes in which are arranged with one or more respective screws to selectively engage in corresponding threaded holes formed in the tool holder shank (12).