Patent GB-190811104-A (GB)
Title: Improvements in or relating to Machines for the Manufacture of Screws.
Inventor: AVERY WILLIAM
Filed: 1908-05-22
Granted: 1908-10-29
Abstract: 11,104. Avery, W. May 22. Lathes; milling; chucks.-In a machine for carrying out certain steps in the manufacture of screws, blanks provided with a cylindrical portion and a head are submitted to a preliminary turning operation, are then nicked, and are finally again turned to remove any burr produced in the nicking operation. A main shaft drives through gearing 4, Fig. 2, an adjustable nicking-saw 6, and through gearing 29 a shaft 28 on which are mounted cams 30, 51, 61, 93. The cam 93 operates the gripping-fingers 85, 86 through the medium of an arm 92 on a sleeve connected to a lever 89, which moves the shaft 70 back against the spring 88, and with it an arm 71 attached to a sleeve 74, inside which is a sliding rod 76 carrying the fingers. The forward motion for inserting the blank into gripping - jaws is obtained from the spring. The jaws 12, Fig. 8, are supported by a hollow spindle 11 in a rocking frame 9, and are closed by a lever 13 operated from the cam 51 through linkage 50, 48, 47, 46 (Fig. 4), shaft 44, arm 43, rod 42 (Fig. 8), clutch piece 40 and sliding- sleeve 14. The frame 9 can be moved into the three positions 16, 17, 18, Fig. 4, and is rocked for this purpose from the cam 30, acting on a lever 31 pivoted at 32 in a frame 32<A>, which is loosely mounted at 32B in the framing and pivotally supports a lever 34 connected to a lever 33 and to a lever 35 which is connected to a snug on the shaft 10. The frame 32<A> is bifurcated to embrace the shaft 10, which, with the rocking frame and the frame 32A, can receive endlong motion. When the rocking frame is in the position 16, a pulley surface 15 on the hollow spindle 11 is driven by a belt from the main shaft, but when the frame is at the other positions it is not so driven, the belt being loose. In operation, the rocking frame is rocked into the position 17 for ejecting a finished blank and receiving a new one, the feed-fingers are opened by the engagement of their inclined ends with the blank, which is fed between guide-rails, the blank is gripped, and the arm 71 is lowered until the blank is below the centre of the gripping-jaws. When a finished blank has been ejected the arm is raised, and the cam 93 allows the shaft 70 to slide under the action of the spring 88, and to insert the shank of the blank in the jaws. For this purpose the rod 76 and its jaws move forward until stops 83, 84 engage, whereupon the sleeve 74 moves on alone and an upstanding lug 75 on it acts against the face of the blank and pushes it home. A second pair of stops bring the rod and sleeve back to their normal relative position. The frame is next thrown over into the position 16, and the head of the blank is acted on by a stationary turning-tool 62, the spindle being revolved in this position and the rocking frame being moved slightly forward by the engagement of a roller on the spindle 10 with a fixed incline. After turning the blank the rocking frame moves to position 18, and the spindle 11 is moved endways under the action of the cam 61, which acts by means of a bowl and lever through linkage on a lever 55 against which the spindle rests. The saw next cuts a groove, and the rocking frame moves over to the position 16 to effect the second turning operation. The frame is then rocked over to position 17, and the finished blank is ejected by a spring-pressed plunger 37 as soon as the gripping-jaws release it.