and 25 are rigid they are not movable in opposite directions which achieves a less complex structure in order to secure the position of gripped tool taper 19 in the respective gripper securing holder 29 is provided on each radially inner leg 24 the securing holder consists of a projecting spring biased roller which is pushed back against the spring tension in an insertion process and automatically returns to its protruding illustrated position as soon as the tool taper is fully located in the gripper an electric switch not shown can connect this securing holder to the program control and the emergency stop of the machine tool in order to shut down the machine in case of an incomplete engagement instead of the rollers as shown other suitable elements such as ramps movable against spring tension may be used as a securing holder instead of the extended holding fingers 20 and 27 of the embodiments of fig1 and 2 respectively the embodiment of fig3 may contain curved holding segment 30 for each gripper thereby forming the continuation of radially inner gripper leg 32 in this embodiment both gripper legs 17 and 32 are fixed against each other guiding bracket 31 is located on each holding segment 30 which engages with ring groove 23 in collar 22 of tool taper 19 it provides guiding and holding functions before tool taper 19 is fully gripped by gripper 17 this is similar to extended fingers 20 and 27 in a previous embodiment the tool changer shown in fig4 differs from the embodiment of fig3 only in the provision of a total of four grippers which are mounted on carrier 13 diametrically opposed in pairs for example offset against each other by right angles as can be seen the structural formation of four.