Patent GB-191101376-A (GB)
Title: Improvements in or relating to Multiple Milling Machines.
IPC: B23C3/24
Filed: 1911-01-18
Granted: 1911-10-12
Abstract: 1376. Smith, O. A., and National-Acme Manufacturing Co. Jan. 18. Milling - machines. - In a multiple - turret milling-machine for slotting nuts &c., of the type in which the tool-slide carrying milling- tools working in parallel planes is reciprocated towards a rotary work turret so that several blanks are slotted simultaneously, the blanks are automatically fed from a magazine to the chucks in the turret. The blanks are mounted in a magazine consisting of a back plate 123, Figs. 3 and 15, connected by slots and bolts 126, 127 to two side plates 124, 125 so that the position and width of the shoot may be varied, and provided with a front plate 128 adjustable by bolts to suit blanks of different depths. The magazine is pivoted at 122 to a bracket on the casing 5 of the turret 6, and has a tapered lower end 140 so that it may be moved aside during the rotation of the turret by any blank that has not been properly seated in its chuck 31 ; it is returned by a spring pin 141 on the bracket 121. The blanks are inserted in the chuck jaws by a plunger 132 with cushioning springs 138, which is mounted on a slide 131 connected to a lever 136 operated by a cam on the shaft 11, Fig. 11. The blank is centred by an adjustable stop mounted on the bracket 130, to ensure its passage into the jaws. Each chuck consists of spring jaws 34, Fig. 4, with an adjustable cap 31, connected through a slot 193 to the hollow spindle 26, which carries the usual cone sleeve 190 and levers 191 for operating the adjusting- sleeve 192, and inside the spindle is an extracting-sleeve 35. The turret carries an interrupted gear, and is rotated by a segmental gear on the shaft 11, which is rotated by worm gear on a shaft 14, Fig. 14, connected by an interchangable gear train 90, 97, 98 to a bushing 99, to which a loosely-mounted driving-pulley 15 may be clutched by a hand-lever 107. In order to change the gear to allow the speed of rotation of the turret and reciprocation of the toolslide 40, Fig. 3, to be varied, the wheel 97 is mounted in a lever 93 connected to the framing by a slot and bolt 96. The other end of the shaft 14 may have a projection for a handle to provide hand operation. The turret is rotated opposite three saws 48, which slot the nuts at different angles owing to the rotation; in the next position of the turret the nuts are released from the chucks and ejected. The cone sleeve 190 in this position is moved to the left by a dog, 161, Fig. 11, carried by a rod 159 which is operated by a lever 156 and cam 154 on the shaft 11, the spring of the jaws retracting the sleeve 192. Th ejector 35, which is normally held by springs against a disk 201 on the turret spindle, is then operated by a shoe 173 carried by a slide 172, which is moved on guide-rods 170, 171 by a cam on the drum 150.. When the turret reaches its initial position, the chuck is caused to close on the next blank by a lever 153 actuated by the cam 154 and made to engage the cone sleeve 190. The turret is held in each position by a spring-actuated plunger engaging sockets in the turret, the plunger being retracted by a cam on the shaft 11 actuating a lever pivoted to the framing. The saws 48, which are mounted on a slide 40 reciprocated through an adjustable stud engaging a cam on a shaft rotated from the shaft 14 by worm gear, are themselves rotated by a pulley splined to a shaft movable with the saw slide and connected to the saw spindles by bevel and worm gear. The shaft, through chain gear, also drives an oil pump. The centre saw is driven in the opposite direction to the other saws, so that the thrust of one tool on the upper bearing 72 is equalized by the downward thrust of the centre saw. The saws are mounted between collars 64, Fig. 8, on shafts 43, mounted in split bushings 51 in tapered bearings 46, the bushings being screwed at the ends so as to admit of tightening the bushings by nuts 52, 53. The bearings have oil chambers 54 containing wick, and the shafts are provided with oil grooves. The rear bearing-bushes 55 are longitudinally adjustable by nuts 57, 56 to bring them, and so also the shafts, against the thrust washer 58 to take up end play. The machine is mounted on the usual oil-pan base supported on standards.