Patent GB-190204270-A (GB)
Title: Improvements in and relating to Screwing Machines
Inventor: MULLER KARL
Filed: 1902-02-19
Granted: 1903-02-12
Abstract: 4270. M³ller, K., and Hinkel, O. Feb. 19. Screwing lathes; tools and tool-holders.-Relates to a machine for pointing the ends of and screwing bolts, pins, or other blanks. A number of similar and parallel spindles 1, shown in plan in Fig. 2, are mounted in a bed and driven at the same speed in the same direction by pulleys 3 and wheels 4 gearing with intermediate wheels 5, the spindles being feathered in the sleeves 2 carrying the pulleys and wheels 4. One of the wheels 5 drives a side shaft 9 through chain and sprocket gearing, one of the sprockets serving as a change wheel. The side shaft 9 drives a cam shaft 13 for operating the various parts. A screwing-head 14, mounted on the front end of each spindle, has levers 15 carrying chasers normally opened by springs and closed by a cone 17 sliding on the spindle and having a pin 18 engaging a slot 20 in the spindle. The spindle 1 is normally held back by a spring 23 inserted between a sleeve 22 secured to the spindle and the sleeve 53. The pointing- tool, shown separately in Figs. 10 and 11, is mounted in the spindle 1, and comprises a holder 77 with internal ribs 78 serving as supports for the cutters 79, which are pressed against a ring 80 by screwing in a spindle 41 which actuates the tool. The ring 80 receives and guides the blank while being pointed. The holder is feathered in the spindle 1, and is moved longitudinally by a lever 46, Fig. 4, moved in one direction by a spring 52 and in the other by a rod 48 connected to a sliding fork 49 having a pin 51 operated by a cam-disc 33. A sleeve 43, adjustably secured to the spindle 41, partially controls the movement of the cone 17 by means of a slot 44 with which the pin 18 engages. The work-holder for each spindle consists of two jaws on the shorter ends of levers 70, Fig. 2, the longer ends of which are connected by toggle links to a bar 73, normally pressed towards the screwing-head by a spring 74, Fig. 4, to maintain the holder in an open position. In operation, the pointing-tool is first pressed out of the screwing-head by the engagement of the surface 65 on the cam-disc with the pin 51. A pair of spring-returned slides 34 on the cam-disc are then displaced radially by a nose 36, Fig. 5, on the slides engaging a cam 38 on a handle 60 bearing against a stop on the frame, the slides operating a lever 58 and a link 56 to compress the spring 23 and prevent the forward movement of the spindle 1. The blank, which is held by the operator with its end in the ring 80, is then seized by the jaws, which are closed by the engagement of a second pair of slides 35 on the cam-disc with projections on the bar 73, the slides being projected radially by a cam 40 on a second handle (not shown). The pointing tool is then slowly advanced by the cam surface 66, to point the blank, and is then withdrawn by the spring 52. The slides 34 are again displaced by a cam 39 on the handle 60, and engage a nose 62 on a rod 27 connected by a link 26 to a lever 24, to move back the spindle 1 till the screwing-head is closed by the engagement of the levers 15 with the cone 17. A spring tongue 63 on the cam disc then engages a lug on a lever 28 to which the rod 27 is adjustably connected, and moves forwards the spindle with a yielding pressure, to effect the screwing. If a blank is not in position, the forward movement of the cone is arrested by the pin 18 engaging the end of the slot 44 in the sleeve 43, held back by the spring 52, and the screwing-head is opened by the forward movement of the spindle. The pressure of the levers 15 on the cone prevents this action when screwing, the movement of the cone being then arrested by an adjustable ring 21 with which a roller on the pin 18 engages. The workholder is opened by arms 75 on the shaft 13. The chasers 16, Fig. 16, are formed with a recess or groove 85 and held in place by a catch 87 and a set-screw 88. Chaser blanks may be inserted and a tap placed in the work-holder to cut the chasers. The levers 15 are pivoted on the screwing-head by eccentric bolts, each having a toothed segment engaging an internally-threaded collar, which can be turned, so as simultaneously to turn the bolts, to vary the closed positions of the chasers. The cam shaft and work-holders may be moved to and from the screwing-heads, to suit the lengths of the blanks.