Machining unit for a milling and drilling machine

A processing unit for milling and drilling having

• a spindle housing that is configured to be movably mounted on a machine,
• a milling head able to rotate about a rotational axis relative to the spindle housing, wherein the milling head is completely disposed outside of the spindle housing and wherein a single side surface of the milling head is attached to a free end of the spindle housing,
• a working spindle that is mounted in the milling head and has a tool holding fixture and an electric drive motor,
• an energy and operating medium supply is provided to the milling head, the supply being an arrangement of lines and cables, and
• a rotary lead through between the spindle housing and the single side surface of the milling head for introducing the lines and cables into the milling head,
• the lines and cables are disposed lengthwise along the rotational axis of the milling head within the spindle housing,
• a bushing is mounted in the spindle housing such that a rotation axis of the bushing is coaxial with respect to the rotational axis of the milling head, a portion of the lines and cables extend along the bushing, and
• the bushing is connected to the milling head at one end of the bushing and is coupled to a drive assembly for rotation in the spindle housing about the rotational axis of the milling head, and a duct is connected to an end of the bushing opposite the one end of the bushing that is connected to the milling head, wherein one end of the duct is within the spindle housing and an opposite end of the duct is outside the spindle housing, and portions of the lines and cables are accommodated in the duct.