GB827417A - Feeding bar stock for automatic lathes or the like - Google Patents

Abstract

827,417. Lathes. AUTOMATION Ltd. July 18, 1958 [July 22, 1957], No. 23176/57. Class 83 (3). Means for feeding stock-bars B through the spindle 1 of an automatic-lathe comprises a divided feed-tube T coaxial with the spindle, and to which the bars are delivered laterally, and a pusher 15 adapted also to withdraw rearwardly and eject the unusable remnant of bar left after machining. Figs. 1-3 show a stock-feed means of the kind described in Specification 728,898, except that a number of carriages 13, Fig. 3, support the movable part 12 of tube T. The carriages slide on rods, one of which, 18, is moved by one of the carriages to operate valves 101, 103 in the automaticcontrol system (not described). A normallyengaged clutch (not shown), controls rotation of the spindle and operation of the turret and tools (not shown), and of the spindle-collet 2, so that the machine stops when the collet opens, the clutch being operated by a lever 8 controlled by the bar-feed. Interchangeable grippers 19 to grip rods of round, hexagonal, &c. section are fixed to the forward end of the pusher 15 and grip the stock when this is held by a stock-stop 7. A ball-bearing 22 on the pusher permits rotation of gripper 19 with the stock, and a stock-ejector 33, retracted by a spring 36, is movable in the pusher to an extent fixed by a slot 35 in the pusher and a pin 34 on the ejector. When the forward-end of the gripper 19 engages the end 57, Fig. 6, of the spindle-collet 2, the pusher is withdrawn automatically, and near the end of this movement the rear end of the ejector 33 engages a fixed stop. Further withdrawal of the pusher ejects the remnant-of-stock 48 through an opening in feed-tube T, or in a breach-tube 12A into which the pusher retracts. Tube T is then opened to receive a new stock-bar, rolled or, as shown, dropped from a magazine. The newbar is then advanced to the stock-stop and gripped by the pusher before being gripped by the spindle-collet and machined. In a modification (Fig. 8, not shown), a ball-bearing is arranged between the end of the pusher and the gripper, which rotates in a self-lubricating bush. The pusher of Fig. 9 is used for ejecting remnants through an opening provided in the bottom of tube T, Fig. 12, by lateral movement of a part 86, or a part 90A, or both. In this pusher the gripper 19 is mounted in a selflubricating sleeve 32, and the ejector 69 is moved by a spring-returned rod 78, which extends through the sloping rearward end 105, Fig. 13, of the pusher. The rod 78 is held by a stop 96 to eject the remnant, and the stop is pivoted to its release position by the end 105 during continued rearward movement of the pusher. For most of its length the feed tube may have a single-piece body with a movable section 91, Fig. 11, to admit the stock, or as shown, a two-part body 89, 90. The ejection section 86 is attached at its ends by brackets 87 to section 91 so that they move together.