GB626614A - Improvements in or relating to automatic lathes - Google Patents

Abstract

626,614. Turret lathes. TAREX SOC. ANON. July 12, 1945, No. 17789. Convention date, Aug. 21, 1944. [Class 83 (iii)] A single spindle automatic lathe having an indexible turret carrying longitudinally movable tool-slides, actuated successively by a common control member and having lateral tool-holders carried by a transverse slide and a longitudinal slide and radial tool-holders each carried by a transverse slide, each slide being actuated by a separate control member, is characterized in that the control members are each connected by a separate connecting device to a source of energy, an impulse-emitting device causing each connecting device to be moved into the operative position at desired moments, but means being provided to prevent this while the slide to be actuated is out of its starting position. The tool-carrying turret R for a single spindle automatic lathe carries tool-slides C which are adapted to be moved by auxiliary slides 1 which in turn are fed by a projecting pin on a long nut 3 engaging in a rotatably-adjustable straight cam-slot in a plate 2 attached to the slide 1. Only the tool-slide in the operative position is engaged by the pin on the nut 3 which is moved by a lead screw VR. This lead screw is driven through a spring clutch AR adapted to slip on overload, a reversing drive 13-15 controlled by a clutch SR, and a high and low speed drive selected by clutches GR, PR from a change-speed gear-box BR. The latter is driven by an independent self-contained electric motor M. The clutches are operated by electromagnets S1, G1, P1, and returned to normal by springs 11, 12. The electromagnet circuits are also conditioned by switches operated by the tool slides and stops 4, 5 on the nut to give the following cycle starting from the initial retracted position of the tool slide, with lead screw stationary: (1) on operation of a switch such as R1 on the control distributer drum O-high-speed traverse of tool up to the work; (2) slow-speed feed motion; (3) reverse; (4) high-speed return to start; (5) conditioning of control circuits so that lead screw will be started for a new cycle when the distributor O actuates R1 &c. again. In the event of the safety clutch AR operating, this is arranged to throw out the main switch to the driving-motor M and also to operate a warning signal such as KL, indicating that part of the circuit which has caused the feed stoppage. Similar feed-cycle arrangements are provided for the members of a compound slide L, LT, and a cutting off slide F. An auxiliary feed-shaft V is provided for the stock-feeding and chuck-operating drives, controlled by an electromagnet D and a onerevolution cam drive. The circuit for this electromagnet is coupled with that for the cutting-off slide so that these always operate in proper timed relation. A modification using cam-shafts and all-mechanical clutching devices is described. Specifications 595,974, [Group XXIV], 598,082 and 626,617 are referred to.