Patent GB-145682-A (GB)
Title: Improvements in and relating to machines for making tires
IPC: B29D30/10
Filed: 1918-10-14
Abstract: 145,682. Goodyear Tire & Rubber Co., (Assignees of Harsel, W. B., and Nall, E. A). Nov. 3, 1917, [Convention date]. Tyres, elastic, special apparatus for making.-Relates to a pressure-fluid system for use in tyre-making machines of the kind described in Specifications 120,563 and 120,564, particularly for controlling the operation of the fabric-manipulating and bead-setting devices, and for positioning the desired roll of fabric from the stockrack. Fig. 1 shows the general arrangement of one form of the machine which comprises a rotary mandrel 3 with variable-speed driving and stop gears as in the parent Specifications. The fabric pressing- rolls 114 are mounted on arms linked to a pair of pistons 130 in a cylinder 129. The bead-setting devices, arranged on opposite sides of the mandrel, comprise a manuallypositioned ring and a power-operated ring 81. The latter is advanced to the mandrel by means of a power-cylinder 63, other cylinders 78 controlling clutch-devices for coupling together the rings when the beads are positioned to set up a consolidating pressure. Tread-applying rolls are advanced to their operative position by means of a separate power-cylinder. The stock-rolls 5<b>, Fig. 13, are mounted on swinging arms operated by means of power-cylinders 7. Referring to Fig. 13, which shows the general arrangement of the controlling-system, the pressure-fluid passes through a filter 187 to branch-pipes 188, 189, 190. In the branch 188, 400 is a regulating-valve and 274 a main cut-out valve. The latter is normally unseated by a spring-pressed lever 284, but is closed at the end of the back-strode of the carriage by the engagement of an arm 289 thereon with the lever 284. Leaving the valve 274, the line branches at 291 to valves 292, 293 which control respectively the supply to the cylinders 244, 245 for operating the presser-lever mechanism. Each of these valves is opened by a lug 324 depressing a lever 306 which is then held by a detent 313. The latter is connected by a rod 322 to a pivoted cam 320 in the path of a one-way detent 330 on the carriage. A branch-line 347, between the valve 292 and the cylinder 244, leads to an exhaustvalve 335 which is controlled by a solenoid 336. The latter is energized to open the valve in the further movement of the carriage, after the closure of the valve 292. The actuation of the solenoid-core also admits fluid, through the line 356, to the cylinder 245 the piston of which, operating on the lugs 236, spreads the lever-arms 229 for the return movement of the carriage. In the modification shown in this Figure, the pressing-rolls 239 are mounted on the ends of the rocking-arms 229 which are pivoted at 234 to the carriage, and are linked at their other ends to the pistons in the cylinders 224. The branch 189 serves, through a manually-controlled valve 359, the stock-roll cylinder 7. The branch 190 serves a manuallyoperated two-way valve 364 controlling the cylinder 218 of the power-operated bead-positioning ring. A branch-line 363 leads to a valve 365 (also under the control of the operator) for admitting pressure-fluid to the cylinders 225 to set-up the consolidating-pressure between the bead-positioning rings. The valve 365, shown in detail in Fig. 20, comprises a main inlet 366 and two outlets 367, 368 controlled by lift-valves 372, 373 respectively. The valves are normally closed by springs 374 (and the pressure-fluid), and are opened by plungers 376 operated by a tumbler 381 fitted with an accelerating-spring 383. Leak-valves are arranged in the various lines, and are automatically opened when the pressure falls below a, predetermined amount.