Patent GB-1369687-A (GB)
Title: Tyre building machine
IPC: B29D30/32
Filed: 1971-10-11
Abstract: 1369687 Tyre building machines NRM CORP 11 Oct 1971 [27 Nov 1970] 47260/71 Heading B7C  A tyre building machine comprises a cylindrical drum 4 for receiving a tyre ply or plies P with the ply edges extending beyond the drum ends; a respective ply edge support mechanism 9 adjacent each end of the drum and axially movable relative to the drum; and respective means 10, 12, 13 operative, when the mechanisms 9 are not in a position to support the ply edges, to turn the ply edges down, set tyre bead cores thereagainst, and turn the ply edges up about the bead cores; each mechanism 9 including a plurality of arcuate segments 33 mounted for pivotal movement between a radially inward position, in which the segments provide support for the associated ply edge or edges when positioned axially to engage the associated drum end, and a radially outward position, in which the segments will lie radially outwardly of the associated ply edge or edges and drum end on axially inward movement of the segments to provide clearance for the ply edge turn down and bead core setting operations by the means 10 and 12 which occur during such axially inward movement of the-segments. Each mechanism 9 may comprise a support ring 25 axially movable to bring the segments 33 to the associated drum end from. a position spaced outwardly therefrom by means of piston-cylinder devices 44 coupled to further piston-cylinder devices 23 which serve to move the segments 33 axially inwardly beyond the associated drum end and to retract the segments from the drum; the support ring 25 carrying rollers 28, 29 engaged with a channelsection ring 32 on which the segments 33 are pivotally mounted and the segments carrying rollers 37 located in a channel-section ring 35 axially movable by means of piston-cylinder devices 38 to effect the pivotal movement of the segments, the rollers 28, 29, 37 enabling rotation of the segments with the drum when engaged with the associated drum end. Each ply edge turn down mechanism 10 may comprise a plurality of fingers 50 pivotally mounted on a support 51, axially inward movement of the support 51 by means of piston cylinder devices 52 causing the fingers 50 to disengage stops on a fixed member 56 and to be moved by springs 54 to a radially outward position in which the fingers will overlie the associated ply edge or edges as shown in dotted lines in Fig. 3, axially inward movement of the support ring 25 when the fingers 50 so overlie the ply edge or edges causing rollers 58 on the ring 25 to contact the fingers and move them to turn down the ply edge or edges and further axially inward movement of the ring 25 then causing a bead core B carried on a bracket 12 on the ring 25 to be set against the turned down ply edge or edges. Each ply edge turn up mechanism 13 may comprise inflatable bladders 60, 61 mounted on a support 70 axially movable by means of piston-cylinder devices 73. The segments 33 may have friction pads 43 at their ends engageable with the drum and may be stepped as shown in Fig. 3, to provide room for storing bead cores cores B on the brackets 12. As shown in Fig. 2, the mechanism 9 and means 10, 12, 13 at-one end of the drum may be contained in a housing 8 movable away from the drum 4 to facilitate removal of a finished tyre from the drum, and the tyre building machine may be provided with stitcher assemblies 5.