Patent GB-196276-A (GB)
Title: Improvements in machine for making tires
IPC: B29D30/16
Filed: 1923-04-07
Abstract: 196,276. Dickinson Cord Tire Corporation, (Assignees of Dickinson, F. S.). April 17, 1922, [Convention date]. Tyre covers, making.-In a machine for making tyre covers a cord cr group of cords is fed under continuous and uniform tension to a device which shapes cord lengths so as to cover the surface of the mandrel when laid side by side, the severed lengths being transferred to laying-mechanism co-operating with the intermittently-rotating mandrel. The machine shown is adapted for shaping and laying groups of cords, and the devices may be duplicated so as to lay a series of such groups simultaneously around the mandrel. The cord groups are fed from bobbins 5, Fig. 2, on a circular frame over guide-rolls 6, driven rolls 7, and idlers 12 to a weighted tensioning-roll 15, then over guide-rolls 23 - - 26 and a comb 28 to a shaping die mechanism where the varying thicknesses and widths are set up in the group of cords. This mechanism, shown in Fig. 5, comprises a fixed upper platen 36 and a movable lower platen 45 which is operated by a cam 48 and links 38, 42. Laterally-movable dies 76 are operated by eccentrics engaging slides, the camshaft and the eccentric spindles being geared to a driven shaft 53, Fig. 2. In this step, the cords are formed to the shape shown in Fig. 7. From the shaping-mechanism, the cords pass between the bracket 79 and springs 81 on a plate 80, and then between spring-fingers 82 carried by pivoted arms 86 pressed apart by an adjustable spring 88. Feed-jaws 111, 114 are reciprocated by rack- and-pinion mechanism, so as to pass in their rearward motion between the springs 82 and grip the cords before the release of the forming- devices. At the end of the forward movement of the jaws 111, 114, the cords are gripped by jaws at the ends of a transfer-arm 177, Fig. 15. At this stage, the shaped strip is severed by a knife carried by a pivoted arm 154, Fig. 17, which is rocked from a shaft 137. During the actual cutting, the strip is gripped between a spring- pressed slotted block in which the knife reciprocates and a platen 176 carried by a rocking lever which is rotated from the movement of the knife arm by cam mechanism. The transfer arm 177, which next receives the shaped strip, is fitted at each end with jaws 181, 184, Fig. 15, forced apart by springs. The jaws are closed to grip the strip (before release of the feed-jaws 111, 114) by a cam on a rook-shaft 189 which is actuated by mechanism comprising toggles 193 on a collar 194 integral with the arm 177. The arm is swung about the shaft 178, to present the cords at the required angle across the mandrel 291, by a cam-operated pivoted arm 205 which is linked to a pin 209 on a collar 210 fast with the shaft. The ends of the strip are thus caused to enter the jaws 218, 240 of devices by means of which the cords are laid around the mandrel. The jaws 218, 240 are carried by slides 211, 212 respectively. The jaw 218 is mounted on an arm 216 pivoted at 237 to the end of the slide 211 and is raised clear of the jaw 240 (against the action of a spring) by cam mechanism. In the actual laying operation, the movement of the slide 211 is arrested when the cords contact with the tread portion of the mandrel, the continued travel of the slide 212 causing the arm 216 to rock into the position shown in Fig. 19. In this movement, the lower jaw 240 is swung away from the cords, and a wiper 252 swung into its operative position, by linkage 242, 243 connecting the pivot 238 with a slide 244. The slide 244 is normally raised by a spring 247 to hold the jaw 240 in its gripping position, abutment of the head 250 with a tappet 257 actuating the slide 244 and its associated parts into the position shown in Fig. 19.