Patent GB-798297-A (GB)
Title: Tire band applying mechanism and method
IPC: B29D30/30
Filed: 1955-05-16
Abstract: 798,297. Building tyres. GOODYEAR TIRE & RUBBER CO. May 16, 1955 [Nov. 16, 1954], No. 14038/55. Class 144 (1). A pre-formed tyre band of two or more plies is applied to a building drum of larger diameter by a series of clamps 26 which grip the edge of the band adjacent the drum 1 at circumferentially spaced points and which are pivoted to an annular support 21 movable axially over the drum, means 44 being provided to cause the clamps to move radially outwardly to stretch the band, at least to the drum diameter, during axial movement of the clamp support 21 over the drum. As shown, the clamp support 21 comprises a ring rotatably mounted by means of rollers 23, 24 in an annular guide channel 8 which is mounted on a carriage 9 running in guide rails 12 for movement axially of the drum 1. The clamps 26 are pivoted for radial movement on brackets 30 which are radially adjustable on a bracket ring 27 secured to the ring 21. Eight equi-spaced clamps 26 are provided, each comprising jaws 35, 36 operable by a thumbscrew 38, and each latchable in a horizontal position when not in use. Movement of the carriage 9 is effected by a motor-driven screwed rod 13 engaged in a nut on the carriage. To effect the desired radially outward pivoting of the clamps 26 during band application, a ring of closely spaced rollers 44 is mounted on an expander ring 41 carried on a sleeve 42 which is axially movable on, but lockable to, the end 43 of the drum shaft 2, the rollers projecting radially beyond the drum surface and serving to cam the clamps 26, and subsequently the tyre band, Fig. 10, to a diameter large enough to pass over the drum 1. To prevent sticking of the band to the drum, or to the plies already thereon, a cushion of air is provided between the surfaces by two rings of jets 46, 47 carried respectively by the expanding ring 41 and the clamp support ring 21 and connectible to a source of pressure air. To position a band ready for application to the drum by the clamps 26 and expander ring 41, a carrying means 4 is mounted on a hollow shaft 7 which is rotatable on a vertical support 5 for swinging movement into, and away from, alignment with the drum. The carrying means 4 comprises a series of circumferentially arranged parallel, horizontal rails 70 carrying rollers 71 over which the band may be supported. Each rail 70 is carried by a pair of links 67 pivoted to a pair of rings 58 rotatably mounted on sleeves 55 which are slidable on the hollow shaft 7. The rings 58 are spacedly connected by diametrically opposed tubes 62, slidably keyed within which are rods 63 connected at their free ends by a yoke 64 which carries a clutch member 77 for coupling with the end of the drum shaft, Fig. 2. To provide for bands of different diameters, the rails 70 are radially adjustable by pivotal movement of the links 67 controlled. by rotatable screwthreaded rods 72 which bear against one link of each pair. In operation, with a band supported on the rollers 71 and the shaft 7 swumg into alignment with the drum shaft, pressure air is admitted to a cylinder 54 on the end of shaft 7 to operate a piston 82 the rod 80 of which is connected, through slots 81 in the shaft 7, to one of the rings 55. The rings 55, carrying the rails 70 are thereby moved axially first to effect coupling of the drum shaft with the yoke 64, and then to telescope the tubes 62 over the rods 63 to bring the band into position for engagement by the clamps 26. Application of the band to the drum is effected with the drum 1, and thereby the expander ring 41, the carrying means 4 and the clamp support 21, rotating at high speed to benefit from centrifugal action on the band. Reverse axial movement of the carrying means 4 by the piston 82, to disengage from the drum shaft, may be utilized, by means of a hook and cable attachment, to withdraw the expander ring from adjacent the drum.