GB844517A - Power-operated turret for boring mills and like machines - Google Patents

Abstract

844,517. Boring-mills; turrets. GIDDINGS & LEWIS MACHINE TOOL CO. May 27, 1958 [June 14, 1957], No. 16915/58. Class 83 (3). A power-operated tool turret for boring-mills and like machines comprises drive-mechanism for rotating the turret in either direction to a desired index-position, and automatic means for unlocking and locking the turret before and after the required rotation. The tool-turret 15, Fig. 3, is carried on a vertically-adjustable ram 11. The drive for clamping and indexing is provided by a reversible electric motor 60 carried by the ram above the turret, and is transmitted by a chain 62 and sprockets at the back of the ram to a toothed wheel 65 which engages another toothed wheel 66 secured to a hollow shaft 70. The latter passes up through the stationary support-member 20 for the turret, and has a gear 71, Fig. 5, on its upper end which drives the various gears arranged in a stationary housing 25 extending beyond the turret proper. The gears comprise two similar drives 73, 75, both driven from wheel 71 and including electric clutches and differential reduction gears. The drive 73 rotates a crankpin 47 with a roller 48, moving in a recess 49 of a rotatable disc 41, which effects turret-clamping and unclamping through toggle levers 44. The drive 75 finally rotates a pinion 51 engaging a ring-gear 53 fixed to the inside of the top of the turret. An electric-brake 95 is secured to the front end of the turret drive 75 to halt the turret in the predetermined index positions (five in the example described). A flexible coupling 129, 89, is embodied in the turret drive, so that dogs on the locking rings 31, 32, Fig. 3, on the turret and the ram respectively, may slide into engagement. Operation.-Automatic operation of the turret is through control-circuits, the ram 11 first being raised to close a switch LS8 before indexing can take place. A selector switch is then set to the index position required and then a two-directional switch is moved to set the reversible motor, moving the turret in the shortest circular path to reach the desired index position. The motor is thus started in the selected direction, and the drive 73 operates to unclamp the turret while the brake 95 holds the other drive 75 stationary. A switch LS7, Fig. 4, is operated when the turret is raised from its seating and is free to rotate, which releases brake 95, deenergizes clutch 73 and engages clutch 75 to start turret rotation. On reaching the selected index position, an arm geared to rotate with the turret closes one of a number of switches (one for each index position), and turret-rotation stops and reclamping takes place, the controlcircuit being finally inactivated when the ram is moved down to operate switch LS8. The turret may be indexed and clamped at intermediate positions by the insertion of hand keys into sockets 93a, 93b, Fig. 5, provided in the ends of the clutch-shafts 76, 77, respectively.