Automatic indicating device for measuring scales in machine tools

Claim 1

APPARATUS FOR AUTOMATICALLY INDICATING THE ADJUSTED POSITION OF MEASURING SCALES IN MACHINE TOOLS, COMPRISING, IN COMBINATION WITH A MEASURING SCALE, A PHOTO-ELECTRIC SCANNING AND INDICATING UNIT, AND A MECHANICAL SCANNING AND INDICATING UNIT, SAID MECHANICAL UNIT RECORDING AND INDICATING THE ADJUSTED POSITION OF SAID SCALE INDEPENDENTLY FROM THE OPERATION OF SAID PHOTO-ELECTRIC UNIT, A PHOTO-ELECTRIC CELL IN SAID PHOTO-ELECTRIC UNIT, AND, DISPOSED BETWEEN SAID PHOTO-ELECTRIC SCALE AND SAID SCALE, OPTICAL MEANS FOR PRODUCING AN IMAGE OF A PORTION OF SAID SCALE IN SAID PHOTO-ELECTRIC CELL, MEANS FOR DEFLECTING THE PATH OF RAYS OF SAID IMAGE, A LIGHT MARK, MEANS FOR DEFLECTING THE LIGHT RAYS EMANATING FROM SAID LIGHT MARK IN THE PATH OF RAYS OF SAID IMAGE, AND INTERRUPTING MEANS DISPOSED BETWEEN SAID PHOTO-ELECTRIC CELL AND SAID LIGHT MARK AND CONNECTED WITH SAID MEANS FOR DEFLECTING THE PATH OF RAYS OF SAID IMAGE, SAID OPTICAL MEANS INCLUDING A FIRST AND A SECOND OBJECTIVE LENS WITH A PARALLE PATH OF RAYS THEREBETWEEN AND DISPOSED BETWEEN SAID SCALE AND SAID PHOTO-ELECTRIC CELL WITH SAID SECOND OBJECTIVE LENS FACING SAID SCALE, A MEASURING SCREW FOR DISPLACING SAID SECOND OBJECTIVE LENS RELATIVE TO SAID SCALE AND FOR OPERATING SAID INTERRUPTING MEANS COMPRISING A MOTOR DISPLACING SAID PHOTO-ELECTRIC AND SAID MECHANICAL UNIT RELATIVE TO SAID SCALE, AND CONTROL MEANS ACTUATED BY SAID FINE COUNTING PORTION, SETTING SAID MOTOR IN OPERATION AS SOON AS THE MEASURED VALUE IS PRESELECTED BY SAID FINE COUNTING PORTION, AT LEAST ONE FURTHER PHOTO-ELECTRIC CELL ACTUATING SAID CONTROL MEANS FOR SAID MOTOR, AND OPTICAL MEANS FOR PRODUCING IMAGE OF THE DIVISION STROKES OF SAID SCALE IN SAID FURTHER PHOTO-ELECTRIC CELL.