Machining unit, particularly for machining the surface of cylindrical cavities, having a tool holding assembly including actuating means for adjusting the tool position and a wireless control system for the actuating means

A machining unit for use in machining the surface of cylindrical cavities, including:

• a fixed supporting structure;
• a bench adapted to support a workpiece that is to undergo machining;
• a machining head mounted and guided in such a way as to be displaceable at least in two directions orthogonal to one another with respect to the fixed supporting structure;
• a motor-driven spindle rotatably mounted on the machining head;
• a tool-holder assembly connected in a decoupleable way to one end of the motor-driven spindle;
• at least one tool carried by the tool-holder assembly in such a way that the at least one tool is adjustable in a direction substantially radial with respect to the axis of rotation of the spindle;
• an electrically controlled actuator mounted on the tool-holder assembly for governing the radial displacement of adjustment of the at least one tool, the actuator including an electric servo motor adapted to control a longitudinal axial displacement of a stem for governing the radial movement of the at least one tool by a screw transmission, the stem having a lateral cam surface adapted to cooperate with a feeler pin associated to a rocker arm which carries the at least one tool so that the longitudinal axial displacement of the stem determines the substantially radial displacement of the at least one tool,
• a microgenerator having a dynamo-electric micromachine adapted to supply electrical power to the electric actuator carried by the tool-holder assembly, the microgenerator further having a microturbine adapted to be actuated by a flow of pressurized fluid for setting in rotation the dynamo-electric micromachine;
• and
• an electronic control system for governing the electrically controlled actuator for controlling the radial displacement of the at least one tool, the electronic control system further comprising:
• an electronic control unit located in a stationary position with respect to the fixed supporting structure of the machining unit;
• a wireless communication system including a wireless transmitter and a receiver device, one of the respective wireless transmitter and receiver device situated in a stationary position with respect to the fixed supporting structure and the other of the wireless transmitter and receiver device mounted on the tool-holder assembly.