Patent GB-145516-A (GB)
Title: Tire making machine
IPC: B29D30/14
Filed: 1920-06-22
Abstract: 145,516. Goodyear Tire & Rubber Co., (Assignees of Templeton, E. G.). Nov. 27, 1918, [Convention date]. Tyres, elastic, special apparatus for making.- In a machine for laying down the fabric plies of a tyre casing on to a rotating mandrel by means of " stitching " rolls 67, the forward travel of the carriage is controlled by electro-pneumatic devices with automatic return, means being also provided for automatically varying the inclination of the rolls during their progress axially of the mandrel. Carriage-actuating mechanism. An electrically-driven sprocket 17 is geared to a screwed shaft 12 which is embraced by a split nut 24 under the carriage 11. Pins 27 on the two parts of the nut are engaged in cam slots 28 in a plate 29 which is operated by a hand-lever 32 for clutching the shaft 12 to advance the carriage. the plate 29 is held in this operative position, against the action of a spring 29<b>, by a latch 43 connected by a link 42 to a crank 33, 34. The lever 33 is pivoted to a rod 36 the free end of which is adapted to operate a switch 38 controlling an electro-magnetic switch E on the main driving-shaft. At a predetermined position in the forward travel of the carriage 11, the arm 34 engages one or other of the stops 108, 109. The latch 43 is thus disengaged from the plate 29 which reacts to open the nut 24, the carriage being thus stopped. By the same movement, the arm 36 operates the clutch-switch 38. The carriage is then retracted by means of a weight 19. Stitching-roll mechanism. The rolls 67 are connected by linkage to the rods 53 of a pair of pistons working in cylinders 49 to which pressure-fluid is admitted for causing the rolls to press yieldingly on the mandrel. The rolls 67 are retracted when the cylinders 49 are exhausted by springs 69. To limit the proximity of the rolls 67 to one another before reaching the mandrel, lugs 70 are arranged to engage stops 71 which are automatically withdrawn by cam mechanism as the carriage advances. Fig. 9 shows the valve mechanism for controlling the distribution of the pressure fluid. 79 is the supply-main, 80 the admission-controlling valve, 82 the exhaust valve, and 83 the feedpipe to the cylinders 49. A rocking-lever 96 is normally constrained by a spring 94 to hold the exhaust-valve 82 open, and allow the admissionvalve 80 to remain closed. This position of the valves is reversed when a shoe 90 on the carriage engages the roller 91 on the end of the yoke 92 to rock the lever 96. The shoe 90 is adjustably mounted on a rock-shaft 87 actuated by the control-lever 32. A hand-lever 126 is provided for raising the required stop 108 or 109 to trip the arm 34 and operate the stop and cut-off gear. Angular adjustment of stitching-rolls. As the stop 108 is raised, a rack 128, Fig. 2, is lifted to engage a pinion 129 on a cross-shaft 130 of the carriage 11. Gears 131 at the ends of this shaft are adapted to mesh with teeth 132 formed on a pair of slides 103. The movement thus given to the slides is transmitted to arms. 59 on the rollsupports so as to vary the inclination of the rolls in their movement about the beaded edges of the casing. The operation of a tread presser-roll 134 is controlled by a treadle 138 and linkage 137, 135.