Patent GB-145683-A (GB)
Title: Improvements in and relating to machines for making tires
IPC: B29D30/10
Filed: 1918-10-14
Abstract: 145,683. Goodyear Tire & Rubber Co., (Assignees of Harsel, W. B., and Nall, E. A.). Nov. 3, 1917, [Convention date]. L Tyres, elastic, special apparatus for making.-Relates to machines such as are described in Specifications 120,563 and 120,564 for building-up the fabric foundation of a tyre cover, the present invention being concerned with the electric controlling arrangements of the pressure-fluid system by which the various mechanisms are operated. The rolls 138 of fabric stock are mounted on a frame 121, Fig. 4, which is adjusted vertically to position the desired roll in operative relation to the mandrel-shaft 4. The frame comprises standards 119 formed with racks 120 which are actuated by pinions driven from the motor 122, a solenoid clutch 125 being interposed in the countershaft drive. The electric connexions for the stock-rack comprise separate push-buttons for each roll, with up- and-down limit-switches and braking- means for positioning the selected roll. The mandrel-shaft 4 is driven from a motor 8 through either of two countershafts (high- and low-speed) each of which is in two parts adapted to be coupled through solenoid clutches 90. To enable instantaneous stopping of the mandrel, one element of each clutch 90 is fitted with a brake 91 which is inoperative only when a solenoid 93 is energized. To provide for a single rotation of the mandrel when laying- on the fabric, a solenoid-control stopgear is arranged in the circuit of the slow-speed shaft-clutch. To separate the pressing-rolls 25 (for the return of the carriage 11), pressure-fluid is admitted to a cylinder 30 through a valve 34 controlled by a solenoid, the circuit of which includes a switch 45. The circuit is made by a finger 50 on a rock-shaft 47 at the limit of the forward travel of the carriage. To ensure operation of the valve 34. an auxiliary cut-out 56, 57 in the solenoid circuit is operated towards the end of the back travel of the carriage by the engagement of a pin 59 on the carriage with the pivoted lever 52 which is linked to the switch-arm 57. In the modification shown in Fig. 9, the pressing-rolls 199 are linked to a pair of pistons in a cylinder 191 to which pressure-fluid is admitted to force the rolls into yielding contact with the mandrel. The rolls are separated at the end of the forward travel of the carriage 198 by fluid admitted to the cylinder 220. The exhaust-valve 192 of the cylinder 191 is controlled by a solenoid 193, Fig. 12, which is energized by a pin 215 or 216 on the carriage contacting with one of a pair of disks 214 mounted on a rod 211 leading to an electric control-box 213. At the end of the forward travel nf the carriage, the solenoid-core 195 first opens the valve-member 200 to exhaust the cylinder 191 through a port 199. The further movement of the core 195 raises the valve-member 208 to admit pressurefluid to the cylinder 220 for separating the rolls 199 before the return movement of the carriage. Timing-arrangements are provided in the circuits for varying the travel of the carriage, and the action of the presser mechanisms, for the ' ujiderbead ' and' over-bead ' operations.