Patent GB-1466431-A (GB)
Title: Tyre building apparatus
IPC: B29D30/20
Filed: 1974-07-01
Abstract: 1466431 Tyre building apparatus NATIONAL-STANDARD CO 1 July 1974 [2 July 1973] 29073/74 Heading B7C A tyre building apparatus comprises a main frame 20, a rotatable tyre building drum 58 supported by the main frame, first and second tyre bead core placing rings 102, 104 supported on the main frame by assemblies 110, 122 slidably mounted on shafts 130, 132, an elongate lead screw 152 rotatable by motor 192 for effecting movement of said first and second rings and their assemblies axially inwardly and outwardly longitudinally of the drum, said elongate lead screw being formed with a righthand thread section having threaded engagement with one of said assemblies and a left-hand thread section having threaded engagement with the other of said assemblies, positive stop means carried by the main frame and being engageable by said assemblies for locating the latter in predetermined inward bead core set positions, and means for reducing the speed of axial movement of said first and second assemblies as the latter approach said stop means and their corresponding inward positions. In the illustrated machine the positive stop means comprises a bar 218 carried by a holder 216 secured to a shaft 222 which is rotatable by ram 234 (Fig. 3a) to move the bar between an operative position between depending portions 116, 128 of the assemblies, and an inoperative position. The speed reducing means comprises a sensor bar 250 in the portion 128, which sensor bar, upon the assembly 122 approaching the bar 218, engages the latter to actuate a first switch to reduce the speed of the motor 192 and to partially disengage an air clutch (186) (Fig. 13, not shown), and then engages a second switch to de-energize the motor, disengage the clutch and activate an air brake. Each depending portion 116, 128 carries rollers 148, 150 engaging either side of a plate 144, 146. In their initial positions the assemblies engage stops 205, 252 (Fig. 2). After application of carcass material to the drum and bead cores to the rings, the pneumatic ram 234 is extended to move bar 218 to its operative position. The air clutch is activated to transmit drive from the motor 192 to the rod 152. Due to bias of the rod 152 to the right by ram 198 only the ring 102 and its assembly 110 will initially be moved axially relative to the drum. Simultaneously, the rod will be moved to the right until collar 161 engages member 176. When this condition is reached the rings will both be moved axially into their bead core setting positions. The bead cores when set are locked in position by means not shown and the rings 102, 104 are moved axially outwardly by the motor 192 being driven in the reverse direction. Movement of both rings occurs until the assembly 122 engages the stop 205. Then the ring 102 is moved alone to the position of Fig. 3a. As the ring 102 approaches this position a third switch is actuated to slow the motor and partially disengage the air clutch, and finally a fourth switch is actuated to stop the motor, disengage the clutch and activate the brake. The carcass is now shaped by expansion of the drum and breaker and bead components are applied. The gauge bar 218 is removed to its inoperative position to allow the rings to be moved closer together and the axial motion of the rings 102, 104 is repeated to assist end ply turn-up bags (not shown) in applying sidewall components to the carcass. End 66 of the drum shaft is supported, excepting during movement of the rings, by a pivotable lever 84 of a tail-stock assembly 70. The gauge bar 218 may be replaced by bars of different lengths to suit different tyre sizes.