VORRICHTUNG ZUR BEFESTIGUNG EINES WERKZEUGS AN EINER WELLE SOWIE MASCHINENSPINDEL MIT EINER DERARTIGEN VORRICHTUNG

摘要

The invention concerns a device ( 1 ) for fixing a tool on a shaft ( 2 ), comprising a drawbar ( 3 ) which can slide axially inside the shaft ( 2 ) and which is used to releasably lock tools fixed on the shaft ( 2 ), in particular for automatically changing tools in automatic machine-tools. The drawbar ( 3 ) is housed in the shaft locked in rotation and has an external thread ( 4 ) whereon is urged to be pressed a threaded body ( 2 ) having a corresponding internal thread ( 6 ). The drawbar ( 3 ) is so arranged as to be able to slide in the shaft ( 2 ), by rotation of the threaded body ( 5 ), to enable change of tools.