Patent GB-873730-A (GB)
Title: Former for tyre bead core winding machines or the like
IPC: B29D30/48
Filed: 1959-10-14
Abstract: 873,730. Tyre bead core formers. NATIONALSTANDARD CO. Oct. 14, 1959 [Nov. 24, 1958], No. 34853/59. Class 144 (1). A former for a tyre bead core winding machine comprises a frame 6 with a hub 14, a pair of peripherally grooved arcuate segments 7, 8 fixed relatively to the frame, and a pair of peripherally grooved arcuate segments 9, 11 which are each pivotally mounted at one end to the frame 6, one adjacent each fixed segment 7, 8, and are associated with an actuator 12 movable relatively to the frame to pivot the segments 9, 11 from a position wherein their peripheral grooves lie on a common winding circle with those of the fixed segments 7, 8 to a position within said circle to permit of removal of a bead core wound on the former segment grooves. As shown, the former is completed by a fifth grooved segment 10 radially adjustably carried by a telescopic spoke member 78, 79 which is slidably mounted in a guide housing 18 on the hub 14 for radially inward movement on movement of the actuator 12. Each segment 7-11 comprises two arcuate members, such as 25 and 29, which are adjustably screwed together by screws 33 and spacer members 32 to define therebetween a V- sectioned peripheral groove 35. The fixed segments 7, 8 and the adjacent ends of the segments 9, 11 are radially adjustably bolted to a sector-shaped frame plate 17, the other end of each segment 9, 11 being pivotally bolted to the outer end of a link 50, the inner end of which is pinned, through a slot 63 in a guide plate 22 fixed to the front end of the hub 14, to an actuator plate 60 slidably mounted on the guide plate 22. The spoke member 78, 79 of the fifth segment 10 is also connected by a pin 90 to the actuator plate 60, the pin engaging through slots 93, 94 in the guide housing 18, a slot 91 in the plate 22, and a slot 91 in the plate 60. The pin 90 and thereby the segment 10, is urged radially outwardly by a spring 100 located in a radial bore 101 in the plate 60 aligned with the slot 91. The plate 60 carries a manual operating handle 102, and an actuating pin 124 for engagement with a cam mechanism (not shown). Locking of the plate 60 in the expanded position of the former segments is effected by a releasable spring-loaded plunger 129, Fig. 4, carried by the plate 60 and engageable in a recess 134 in the plate 22. In use, the leading end of bead wire stock is clamped to a bevelled end 118 of fixed segment 8 by an end 117 of a spring-loaded bell-crank 111 pivoted on the frame plate 17. The former is then rotated to wind the desired number of convolutions into the former groove 35, after which it is stopped in the position shown in Fig. 1. The actuator plate 60 is then moved upwardly along the plate 22 either by means of the handle 102 or by means of the cam mechanism acting on the pin 124, the locking plunger 129 having first been withdrawn. Initial upward movement raises the inner ends of the links 50 to cause the segments 9, 11 to swing inwardly towards the hub 14, and continued upward movement brings the lower end of the slot 91 in the plate 60 into engagement with the pin 90, thereby to draw the segment 10 radially inwardly. At the end of the upward travel of the plate 60, a track 105 on the upper edge thereof engages a roller 108 on the belt crank 111 to rotate the bell-crank to release the end of the bead core wire. The wound bead core is then removed and the end of the bead core stock is positioned on the segment surface 118. Return movement of the plate 60 effects clamping of the bead core end and expansion of the former segments to winding position. In an alternative arrangement, the locking plunger 109 may be replaced by a spring- loaded bell-crank member pivoted on the plate 60 so that one end engages an abutment on the plate 22 in the locked position, and the other end is disposed for release actuation by the cam mechanism which operates on the actuator pin 124.