Apparatus for facing and internal turning

Claim 1

An apparatus for facing an internal turning, comprising a housing rotatable about an axis of rotation; at least one carriage displaceable in a guideway transversely to said axis of rotation; cutting tools arranged on said carriage; a drive motor arranged in the rotatable housing for displacing the carriage; measuring means provided in the housing for direct measurement of the distances of displacement of said carriage relative to said housing; an evaluation and control unit stationarily arranged outside the rotatable housing for evaluating the results of distance measurement and for controlling the drive motor; meausurement and supply lines between the rotatable housing and the stationary evaluation and control unit; said measurement and supply lines being connected to said measuring means and said motor and a transfer unit arranged in the measurement and supply lines for transferring the measurement signals and supply of energy from those parts of the measurement and supply lines communicating with the rotatable housing to those parts of said lines communicating with the stationary evaluation and control unit, said distance measuring means comprising a glass scale rigidly connected to the carriage and at least one scanning element rigidly connected to the housing, said glass scale being lit from a light source provided outside the housing via a first or supply light conductor, the light signals from the glass scale being conveyed directly to additional or measurement light conductors at the scanning element, and said transfer unit having a stationary ring including a photoelectrically effective interior surface for each measurment light conductor, the light exit ends of said measurement light conductors travelling past said interior surface when the housing rotates, to introduce light signals continuously into said photoelectrically effective interior surface.

Claim 2

An apparatus for facing an internal turning, comprising a housing rotatable about an axis of rotation; at least one carriage displaceable in a guideway transversely to said axis of rotation; cutting tools arranged on said carriage; a drive motor arranged in the rotatable housing for displacing the carriage; measuring means provided in the housing for direct measurement of the distances of displacement of said carriage relative to said housing; an evaluation and control unit stationarily arranged outside the rotatable housing for evaluating the results of distance measurement and for controlling the drive motor; meausurement and supply lines between the rotatable housing and the stationary evaluation and control unit; said measurement and supply lines being connected to said measuring means and said motor and a transfer unit arranged in the measurement and supply lines for transferring the measurement signals and supply of energy from those parts of the measurement and supply lines communicating with the rotatable housing to those parts of said lines communicating with the stationary evaluation and control unit, said distance measuring means comprising a glass scale rigidly connected to the carriage and at least one scanning element rigidly connected to the housing, said glass scale being lit from a light source provided outside the housing via a first or supply light conductor, the light signals from the glass scale being conveyed directly to additional or measurement light conductors at the scanning element, and said transfer unit having a stationary ring including a photoelectrically effective interior surface for each measurment light conductor, the light exit ends of said measurement light conductors travelling past said interior surface when the housing rotates, to introduce light signals continuously into said photoelectrically effective interior surface.