A device (10) for an automatic connection of a high-speed spindle (40) to a numerically controlled machine, the device (10) comprising:
- a first connecting element (11) which is configured to be fastened to a tool-holder spindle of the numerically controlled machine, and
- a second connecting element (31) which is configured to be connected to the first connecting element (11) and which is configured to be fastened to the high-speed spindle (40), the high-speed spindle comprising a tool (41) and an electric motor for actuating the tool (41),
- wherein the first connecting element (11) comprises at least one first electric contact element (14) to electrically power the high-speed spindle (40),
- wherein the first connecting element (11) further comprises a first duct (12) for passing pressurized air there through, the first duct (12) being connected to a supply network from which the pressurized air is supplied,
- wherein the second connecting element (31) comprises at least one second electric contact element (34) which is configured to establish an electric contact with said at least one first electric contact element (14) in order to electrically power the high-speed spindle (40),
- wherein the second connecting element (31) further comprises a second duct (32) for passing pressurized air, coming from the first duct (12), there through,
- wherein said first connecting element (11) and/or the second connecting element (31) further comprises a sealing means (37) to sealingly connect the first connecting element (11) and the second connecting element (31) to one another,
- wherein, when the sealing means (37) sealingly connects the first connecting element (11) and the second connecting element (31) to one another, the sealing means (37) prevents an air flow of the pressurized air from flowing outside of the device (10), thereby maintaining the air flow between the first and the second connecting elements (11, 31) and ensuring a passage of the air flow through the first duct (12) of the first connecting element (11) and into the second duct (31) of the second connecting element (31) so as to send the air flow of the pressurized air to the high-speed spindle (40),
- wherein said second connecting element (31) comprises a pin (38) which is inserted inside the second duct (32), and which prevents the air flow between the second duct (32) and the high-speed spindle (40) when the first and second connecting elements (11, 31) are not sealingly connected by the sealing means (37), and
- wherein said first duct (12) comprises a pressing element (18) which is inserted in the first duct (12) and which has an end thereof connected to a plate (19), the plate (19) being located outside of the first duct (12) and being configured to deviate the air flow coming from the first duct (12) and to contact the pin (38), and
- wherein, at a time when the plate (19) contacts the pin (38) and the at least one first electric contact element (14) and the at least one second electric contact element (34) are not in contact with one another, the air flow coming from the first duct (12) crosses a space disposed between the first connecting element (11) and the second connecting element (31) and goes outside of the device (10) when the first and second connecting elements (11, 31) are not sealingly connected by the sealing means (37).