PROGRAM-CONTROLLED CARRIAGE Russian patent published in 1995 - IPC

FIELD: machine-tool industry. SUBSTANCE: carriage has motionless and rotating cases; rotating case is provided with shank mounted in spindle of the machine. Electric motor is disposed inside rotating case which is connected with radial carriage through kinematical circuit. Electric motor is connected with numerical control unit through contact rings, brushes and power unit. There is position detector in carriage, as well as end switches mounted in rotating case; data from the detector and switches is transmitted to numerical control unit through special channels. Independent-excitation constant current engine is used as electric engine. Unit for indirect calculation of speed is used to get data of rotational speed of the engine according to electrical measurements of current and voltage which are formed in power unit of electric engine. Application of "brush-ring" contact pairs in carriage for transmission only of power to electric engine and radiochannels allows to reduce to zero effect of commutation noises. As a result, precision of carriage positioning is improved. EFFECT: improved precision. 7 cl, 6 dwg