Patent GB-197703-A (GB)
Title: Improvements in and relating to the manufacture of tires
IPC: B29D30/34
Filed: 1921-11-15
Abstract: 197,703. White, A. E., (Yoder Morris Co.). Nov. 15, 1921. Tyre covers, making.-In a tyremaking machine of the type in which a web of composite tyre and bead material is wound in superposed layers on a rotary core, the layers are consolidated and shaped by applying pressure to all parts after winding them on to the core. Fillers c are fed from two drums a, Fig. 2, around a roller 37 and over pulleys 59; and along the grooved sides of a platen 33 which spaces the fillers. Two members 40 carrying a series of drums 46, rotate upon a supporting member l surrounding the platen 33, so that the fillers as they are drawn through by rollers q, r are wrapped by the cords k. A continuous fabric band f is fed over a drum e by rollers 35, 36 geared to the roller 37, and passes over a member at the end of the platen 33, conveying rubber h at the same speed as the fillers c from a roll d on a spindle 29 guided in slots 30 so that the roll is always in contact with the band f. The rubber layer h may be omitted. The core D, Fig. 7, in a chuck 80 is carried by a shaft 79 having a fixed gear wheel 85 between which and a disc 96, which is slidable axially on the shaft, is loosely mounted a gear wheel 81 with friction discs between it and the gear wheel 85 and the disc 96. A worm wheel 98 mounted on a screw-threaded boss 103 is rotated by a worm 99 and bears against the disc 96, to vary the positiveness of the drive transmitted by the gear wheel 81. A shaft 108 carries a bevel wheel 107 meshing with two bevel wheels 109, 110 loose upon the shaft 100 and coupled by a cone clutch 111 keyed to the shaft 100, and engaging one or other of the bevel wheels when actuated by a link 115 and an arm on a shaft 77 which is rocked as the tension of the material varies in passing over a roller y, Fig. 4. A power shaft 83 is geared to the shaft 108 by wheels 117, 120. Two integral gear wheels 82, 84 are mounted to slide on the shaft 83 and are moved along by a handle, so that a positive drive is formed by the wheels 84, 85, or a non-positive drive by wheels 82, 81 and the friction discs. A dog clutch 119 controls the rotation of the wheels 117, 120 and shaft 108. The clutch 119 is interlocked so that it cannot be engaged when the high speed gears 84, 85 are meshed. The material is passed between the spring-pressed rollers q, r, Fig. 4. A second rubber sheet s may be fed from a drum t over the roller q on to the upper surface of the material by a band w running over a drum v and the roller q, which is grooved to take the beaded edges of the material. The shaft 108 has a sliding-pinion 217 carrying on its boss one end of a lever 214 which carries a wheel 213 meshing with the pinion 217 and with one of a number of wheels 212 on the shaft 73 carrying the roller r, according to the position of the lever 214 in a stepped slot. A chain sprocket 202 integral with the bevel wheel 110 transmits power to a shaft 199, Fig. 2, having a sprocket 198 which rotates the drum 40. A number of cylinders 143, Fig. 11, carry pistons with rollers a a which force the material on to the core D under the action of fluid pressure against a return spring. The peripheries of the rollers are formed to suit the contour of the finished cover, those for operating on the beaded portions being formed as shown in Figs. 15, 16, 17. The cylinders operating on the beaded portions are adjustably mounted in the support 166 secured to a member 170 sliding between arcuate guides 169, Fig. 11, under the control of a cylinder 182, Fig. 4. The guides 169 are shaped so as to maintain the rollers at the point of contact of the material with the core independent of the size of core. A roller 177, Fig. 11, between arms 176 loosely supported on a shaft 172 bears upon the tyre cover under the action of a coiled spring, one end of which is secured to the arms 176, the other end resting against an arm 173 carried by the shaft 172, so that when the cylinders are moved towards the core D the spring is tensioned until it rotates the shaft 172 thereby forcing a bolt 179 in the slide 170 into engagement with ports 180 in the guides 169. Movement of the piston rod 184<a> in the direction to move the cylinders away from the core, rocks a crank thereby withdrawing the bolt 179 and freeing the member 170 which moves along the guides. A pipe 153, Fig. 4, supplies both end cylinders 143 and a pipe 154 supplies the main cylinders 143. A master valve 161, in the position shown, admits fluid pressure to the upper end of cylinder 182 and to the bead rolling cylinders 143, also to the main cylinders 143 dependent upon the operation of a. valve 56. In the reverse position, the valve 161 admits pressure to the lower end of cylinder 182 and releases the pressure in all the cylinders 143. In order to secure even tension on the cords k, each one is threaded through an eye 56, Fig. 2, formed on the end of a spring 54, and finally through wire or similar eyes 57. The drums 46 each have brake rims 51 engaged by pivoted, spring- pressed shoes 50, the cords passing over a grooved roller 47 carried between the ends of the brake levers 48. In order to secure even tension on the bead fillers c, Fig. 2, the guide pulleys 59 are carried on pivoted brake arms 58 having shoes 60 acting on the drums 26. The lower ends of the arms 58 are connected to the ends of a crossbar 63 the middle of which is connected by a cable 64 passing over a spring-controlled pulley to the lower end of the bracket carrying the roller y, so that the action of the pulley tensions the material passing over the roller y and also the bead fillers c, tending to apply the brake shoes 60 to the drums 26. The beaded edges may be of the form shown iu Fig. 17. The core D has rings 140 at its sides on which a rubberized fabric strip 116 is laid by hand, the core being rotated at its higher speed for this purpose. Filler material 130 consisting of folded, compressed tapes is then wound on through guides 134, 135, 136, Fig. 7. The beads c in this case may comprise wires 130<a>, and tapes 131 of the same material as the fillers 130 may be wound on above the beads, the whole being consolidated as it is wound on by rollers 150. A modified apparatus is shown in Fig. 27, producing a cover with a beaded edge of the form shown in Fig. 40. The platen 33, Fig. 27, has troughs 300 carrying rubber tapes 301 fed from drums 302', the troughs extending to the point at which the cords 302<a>, 302<b> are applied so that as the cords are wrapped around the beads c, the tapes 301. are folded over the bead strands. The beads c are preferably stranded wire and the strips 301 are preferably hard rubber. The material 302<a>, 302<b>, preferably consists of cords, on a rubber foundation, or embedded in rubber. The drums Fig. 34 comprise axially-adjustable discs 309 on a sleeve 308 which is detachably-secured to a brake drum 311. Even tension of the material is secured by a spring and brake band 317, the spring being tensioned by an arm 319 pressing against the material on the drum. The consolidating means consists of geared driven rollers q, grooved to accommodate the beaded edges. They may be steam heated. The bead strands may be omitted, the strips 301 alone being used in small tyres.