Rotating machining head for automatic tool machines

An operating head device for an automatic tool machine comprising:

• a shaft including a shell having an axis and which is rotatable around said axis and displaceable along said axis;
• a fork having a base connected to said shell and a pair of spaced-apart arms, said fork being rotatable with said shell about said axis and movable along said axis;
• a tool-bearing unit having a pair of trunnions extending outwardly therefrom, at least one of said trunnions being hollow;
• a ball bearing mounted to each arm of said fork and rotatably receiving said hollow trunnion for rotatably mounting said unit to said fork between said arms;
• a mandrel rotably mounted in said unit and accessible from a front surface of said unit which is spaced from said trunnions;
• said unit including a suction port in said front surface adjacent said mandrel and a first duct therein extending from said port to said hollow trunnion;
• said base of said fork including a ring chamber therein, said fork having a second duct extending from said ring chamber to said hollow trunnion and communicating with said first duct.