Apparatus for copy machining having a manual control

Claim 1

Apparatus for copy machining having a manual control and mechanical drive, preferably for optical profile grinding machine incorporating an optical system projecting an enlarged silhouette of the workpiece and a tool as well as an enlarged layout of the profile to be reproduced on a screen, the machine being provided with two slides driven by two DC motors having controllable speeds, said apparatus comprising a steering disc, two potentiometers having their respective output terminals connected respectively to respective ones of said motors, each of said potentiometers being divided into four equal parts by five tappings and having a sliding contact connected to a respective one of said output terminals, said steering disc being connected to said sliding contacts through a control disc and transmission mechanism, the first, middle and last one of said tappings being connected with each other and the remaining two tappings being connected to one another, forming respective first and second input terminals, said first input terminal of one of said potentiometers and said second input terminal of the other of said potentiometers being connected together and said second input terminal of said one potentiometer and said first input terminal of said other potentiometer being connected together, said potentiometers providing a phase position complying with the angular displacement by 90° of the steering disc.