| 摘要 |
This invention provides hydraulic copying apparatus for application to machine tools such as milling machines, in which the axial and oscillatory movements of a stylus control three copying valves, two of which are arranged with axes perpendicular to each other in a plane perpendicular to the axis of the stylus and the third of which is arranged with its axis non-coaxial with the axis of the stylus. An oscillating device such as a lever operates the third valve, and is always operatively connected to the end of the stylus both in the manual and the automatic tracing mode of the apparatus, to transfer to the third valve only the axial movements of the stylus. Externally operable means act on the oscillating device for the actuation of the third valve in response to the oscillations of the stylus, these means being rendered operative during automatic functioning of the apparatus, while the first two valves are contemporaneously rendered inoperative. |
