Patent GB-119259-A (GB)
Title: Improvements in and relating to Automatic Machine Tools.
IPC: B23Q39/04
Filed: 1917-08-21
Abstract: 119,259. Marks, E. C. R., (Bullard Machine Tool Co.). Aug. 21, 1917. Lathes.-In an automatic machine suitable for boring, screwing, and turning the inside and outside of cylindrical surfaces, and particularly adapted for finishing pulleys, fly-wheels, gear blanks, &c., and, as shown, comprising five toolcarrying heads 105 adapted to be fed towards and away from six rotary work-holders 34 carried by a carrier 28 which is intermittingly revolved and indexed to bring the work-holding members successively into alinement with the heads 105, a drum 71 is provided for controlling the indexing means of the intermittingly rotated carrier 28 and for locking it, for controlling the means for independently rotating the holder 34, and for controlling reversible feed mechanisms for each of the heads 105. The drum is intermittingly operative, being rendered inoperative at the commencement of the indexing movement and operative at the completion of said movement. The drum is stopped during the down and up movements of the sliding heads 105. The holders 34 and heads 105 may be operated at various speeds. The carrier 28 is mounted upon an annular base 21, Fig. 3, and carries rotary spindles 27 which pass movable to facilitate access to the parts. The shaft 51 is geared to one element 60 of a clutch member, the other part 64 being keyed to a central shaft 61 which also carries the movable element of a brake 67. The brake and clutch are operated together by an external lever 66. The shaft 61 is in line with a lower shaft 68 mounted in bearings 69, 70, Fig. 3, and is connected thereto by an automatically operated clutch 72, 73 actuated by the controlling drum 71, Figs. 3 and 5. The clutch is connected to a brake 74 that is simultaneously operated by an arm 77 and slide rod 78 actuated by cam lugs 81 on the drum 71 so that the clutch is opened and closed for each rotation of the drum 71 and one-sixth turn of the carrier. The lower shaft 68 is connected to the table spindles 27 by toothed gearing co-acting with wheels on .side shafts 141, 146 provided with four speed wheels 142, 143, 148, 149. These may engage hand-adjusted sliding-gears 152 which rotate broad-faced gears 155 connected up by slip gears 42 to the gears on the spindles. The carrier 28 is driven from the upper shaft 61 through speedreducing gears 82, 83 on a clutch shaft 84, Fig. 5. A pinion 86 on the shaft 84 drives a large indexing-gear 87 on a shaft 88, Fig. 3, having a pinion 91 on its lower end meshing with a wheel 92 on the carrier to rotate it from one station to another. The drum 71, mounted on a plate 85 on arms 93 secured to the column 44 has a wheel 92<a> by which it is rotated by a pinion 91<a> on the shaft 84, and a controller-ring 94. The carrier 28 is automatically locked in its respective positions by a rod 97, actuated by a cam groove in the drum 71, acting through bell-cranks and a link to raise a pin to engage holes in its underside. The toolcarrying slides 105 are actuated by screws 110 operated by reversible feed mechanisms actuated by vertical shafts 43 having bevel-wheels 113 engaging wheels 114, 115, Fig. 13, on sleeves 116, 117, either of which by means of clutches causes a shaft 118 to rotate the screw 110 by toothed and worm gearing. The clutches are connected by rods mounted on arms 126, 127 and are actuated by tappets as shown. The cranks 127 have spring-pressed stops 129 which engage stops 130 on the tappet rods 131. In order to maintain the cycle of operations throughout, all the slides start the downward movement together, under the control of the drum 71. The arms 126, 127 are stopped in neutral position in their movements from right to left by rods engaging recesses in the connecting-rods until released by cams 138 on the drum. The indexing of the carrier is effected by a wheel 87, Fig. 3, which gears with a wheel 86 connected to a clutch member 157, Fig. 5, which engages a drum 158 secured to a shaft 84 driven by reducing gearing from the shaft 61. The clutch 159 is operated by a lever 161, Fig. 15, which is actuated by one end of a pivoted spring-controlled lever 162, Figs. 6 and 8, the other end of which carries a pin 164 which engages the sides of an annular recess 165 in the wheel 87 until a gap 166 is reached, when the spring moves the lever to disconnect the clutch. The lever 162 and clutch are brought into engagement by a spring- controlled stop actuated by a lug 172 on the drum 71. The wheel 87 has a notch 173, Fig. 9, which receives a stop-pin 174 as the gear rotates and carries at its end an arm which is normally seated in a notch 179, but is pressed into engagement with one of a number of notches in the ring 94 on the drum as it comes into alinement with the pin to lock the drum during the indexing of the carrier. The notches in the ring 94 may be engaged by a hand-operated pin 186 which is drawn out when it is desired to allow the ring and machine to run undisturbed. The notches 180 are also engaged by lever 193, Fig. 5, on rods 191 which have projections 194 engaged by the slides. The drum 71 is mounted to make one revolution for each movement of the carrier and is connected to the shaft 84 by toothed gearing controlled by a clutch 181 actuated by a lever 182 operated by stops 183 on a controller-ring 94 yieldingly connected to the drum by a spring to allow slight movement of the drum after engagement. When the slides have completed their upward movements, they release the drum, and the ring 94 is moved by a spring to actuate the clutch 181 to rotate the drum. The drum first disconnects the clutch 181 and withdraws the carrier-locking means, the clutch 158 is next operated and the carrier rotated, during which time the drum is stationary. When the wheel 87 completes one revolution, the stop pin 174 enters the notch 173 and releases the drum which moves and throws in clutch 73 and drum 72, Fig. 5, to start the down feeds for all the slides. When they release the arms 194, the arms 193 rest on the ring 94 and drop into notches and stop the controller-ring. When the slides engage tappets 133, Fig. 1, the gears are reversed and the slides run back and withdraw the arms 193 to release the controller drum, which is free to move ahead and start the carrier and a new cycle of operations.