Patent GB-190126727-A (GB)
Title: Improvements in Machines for Screw Threading, Heading, and Elongating Metallic Rods.
Inventor: WARWICK GEORGE THOMAS
Filed: 1901-12-31
Granted: 1902-11-13
Abstract: 26,727. Warwick, G. T., and Leete, T. W. Dec. 31. Forging; rolling; screwing; straightening.-A machine for elongating, heading, and screwing metallic rods is shown as applied to the manufacture of bicycle spokes for which it is particularly suited. Figs. 1 and 2 together show a plan of the machine. Wire w is fed from a reel through straightening-rolls 32, 33 by a slide 34 with a roller friction grip. The slide is moved forward by a cam 39 on a shaft s<1> and returned by a spring 40, its backward movement being limited by a screw 41 to regulate the feed. The wire is then cut by a device of suitable construction, such as a knife 46 operated by a lever 48 and a cam 50 on a shaft s<2>. The cut blank is then passed through four pairs of gapped rolls 51, 52, 53, 54 arranged alternately at rightangles to gradually reduce the middle or body portion of the blank. One roll of each pair is adjustable to vary the pass. The pairs 51, 53 are driven from the shaft s<1> and the pairs 52, 54 from a shaft s<2>. Another shaft is geared to the shaft s', which is driven by gearing 153 from a belt pulley 150. Tubular guides 82 conduct the blanks from one pair of rolls to the next. After leaving the last pair of rolls through a guide 83, the blank is fed at an increased speed by rollers 84, 91, Fig. 5, to the heading-mechanism. The roller 84 is driven by chain gearing from the last set of rolls, and the roller 91 is carried by a vertical rod 93 which is raised by a cam 96 on the shaft s<1> to grip and feed the blank. The heading-mechanism consists of a stationary adjustable jaw 97 and a movable jaw 100, operated by a cam on the shaft s<2> to grip the rod while the head is upset by a die 107 on a slide 108. Both jaws may have grooves 105, Fig. 5 with enlarged ends 106 to receive the head end of the blank and hold it firmly while upset. The slide may be actuated by toggles 112, 113 from a<*> cam 118, and returned by a spring 119, its backward movement being regulated by a screw 110 to determine the position of the blank for heading, the die acting as a stop. The rear end of the blank is then gripped by a divided slide 120, normally opened by springs but closed on the blank by a cross-slide 124 operated from the shaft s<1> and coacting with an adjustable stationary abutment 126. Antifriction rollers mounted in free cages 125, are placed between the slide and the parts 124,126. The slide is reciprocated by a cam 135, lever 131, and toothed segment 136 engaging both parts of the slide, thus slightly stretching the blank to straighten it and adjust its rear end to the position for screwing between rollers 137, Fig. 8. These rollers have projecting wedge-shaped segments 138, Fig. 12, to reduce the diameter of the wire before screwing so that the diameter of the rolled thread shall not exceed the original diameter of the wire, screw-rolling segments 139 and recessed segments to allow the blank to pass freely between the rollers. The rollers are driven by gearing from the shaft s' and are carried by slides 148 adjusted by screws 149. When the blank has been gripped by the segments 138, the slide 120 is returned and the heading-die withdrawn. The rollers will then roll a thread till the recessed segments are adjacent to the blank, after which the jaw 100 is released and the blank drops out between the two parts of the slide 120, another blank being propelled forward to take its place. The cams which operate the jaw 100 and slide 120 are constructed to" ease off slightly as the blank is being screwed to allow it to rotate.