Device for controlling bar facing on automatic lathes for machining bars

Device for controlling the facing position of a bar on an automatic lathe for machining bars comprising

• an advancement element arranged for moving in an advancing direction toward said lathe;
• a bar pusher rigidly connected to said advancement element;
• a guide parallel to said advancing direction;
• a carriage slidingly supported on said guide;
• rod means arranged on said carriage and extending parallel to said advancing direction;
• intercepting means controlled between an interception position of said carriage corresponding to a bar loading position and a release position;
• clutch means for frictionally connecting said bar-pusher to said rod means so as to cause entrainment of said carriage along said guide toward said lathe when said intercepting means is in said release position and to allow sliding of said bar-pusher relative to said rod means when said intercepting means are in said interception position;
• first sensor means arranged to detect the front end of a bar to be machined at a predetermined distance from said facing position of a bar and to activate said intercepting means from said interception position to said release position;
• and
• second sensor means arranged along said guide and controlling stopping of said advancement element when said front end has covered said predetermined distance.