Patent GB-741814-A (GB)
Title: Improvements in or relating to press for shaping and curing pneumatic tires
IPC: B29D30/06
Filed: 1952-05-30
Abstract: 741,814. Control of two motors; actuation of switches. McNEIL MACHINE & ENGINEERING CO. May 30, 1952 [Feb., 5, 1952], No. 13794/52. Classes 38(3) and 38(5) [Also in Groups V, XXIV, and XXVI] Shafts 76, 138, Fig. 24, ar oscillated by two electri motors through less than 360 degrees and back again The two motors are no shown, but will be called and 10. Motor 8 oscillate shaft 138 and motor 10 oscillates shaft 76. These motors operate one afte: the other, and means are provided to ensure tha when one is moving the other cannot move Circui breakers 453 (76) for moto: 10 and 454 (138) for motor 8 are mounted on a station ary plate 452, and are oper ated by T-shaped lever: 465. 455 pivoted at A and E and biased by springs 469 457.. One arm of lever 455 is connected by link 447 t( shaft 76, the link being sup ported at 446 and having a roller 448 which runs on a cam 442 fixed on shaft 76 Another arm of lever 455 has a swivelled pin 459 slidable on a rod 460 fixed at 463 to one arm of lever 465. Another arm of level 465 carries a roller 466 which runs on a cam 468 secured to shaft 138. Operation:-In the position shown, both motors are stationary. The circuit breaker 453 (76) for motor 10 and shaft 76 is open, so that shaft 76 cannot move, and the' circuit breaker 454 (138) for motor 8 and shaft 138 is closed. A switch (not shown) is closed, and motor 8 moves shaft 138 clockwise until roller 466 falls into a notch 470 in cam 468, whereupon a limit switch stops the motor and shaft. The resultant movement of the lever 465 closes circuit breaker 453 (76) and thus conditions motor 10 to turn shaft 76. Another switch (not shown) is closed and motor 10 turns shaft 76 counterclockwise, whereupon roller 448 rides out of notch 443 in cam 442. The resultant leftward movement of link 447 opens circuit breaker 454 (138), so that a shaft 138 cannot move. Shaft 76 turns counterclockwise to a position short of a cam rise 445 and stops. Later, the two motors reverse, motor 10 (shaft 76) moving first and motor 8 (shaft 138) following it, the same interlocking mechanism operating in reverse. Over-running of motor 10 at either end of its travel is prevented by cam rises 445, 444 on cam 442, these rises pushing link 447 leftwards to an abnormal extent, whereupon pin 459 on lever 455 strikes collar 461 on rod 460 and rocks lever 465 to open circuit breaker 453 (76). Actuation of switches:-Two shafts 380,. 381, Fig. 25, carry cams 400, 401, 420-1-2-3, which operate micro-switches 410-16-18-27- 30-34-36a-38. Cam 400 has a hub portion 402 having an outer rim 403 with overhanging edges, by which different types of cam members may be mounted thereon. As shown, two ring-shaped discs 405 are held on the cam by bolts 407 passing through side rings 406. On the rims of the discs are two registering notches (409, Fig. 26, not shown). Cam 401 has a similar hub and rim, but has individual cam lugs 414, 415 each secured by bolts 415c and having a projection 415a. Cams 420-1-2 are similar to cam 401 and cam 423 is similar to cam 400. As shown, two idle switches are provided at I.