Patent GB-1437692-A (GB)
Title: Device for pressing carcass cord plies against a shoulder of an  assembly drum of an assembly drum of a tyre-building machine  and for turning them over a bead core
IPC: B29D30/18
Filed: 1974-03-01
Abstract: 1437692 Tyre building apparatus VSESO N-I I KONSTRUKTORSKY INST PO OBORUDOVANIJU DYLA SHIN PROMYSHLENNOSTI 1 March 1974 9249/74 Heading B7C Apparatus for turning down one end of a multi-ply carcass positioned on a tyre building drum 12, for setting a bead core, for turning the end of the carcass up around the bead core, and for pressing the turned up end against the remainder of the carcass, comprises an annular support 1 pivotally mounting two sets of levers 2, 3, the ends of each set being joined by a respective annular coil spring 4, 5 and the set of levers 3 being pivotable radially outwardly by a pneumatically movable piston 9, and a bead core setter 15 axially movable on a shaft 11 by a pneumatic cylinder 16. The support is axially movable on the shaft 11 by a pneumatic cylinder 13. Piston arm 21 of unit 19 is engageable by an arm 22 connected to the support 1, and a similar piston arm 42 of unit 40 is engageable by an arm 43 connected to the bead setter. Each unit 41, 40 includes a piston 20, 41 and a chamber 24, 45 containing hydraulic fluid, and each is in series with a fluid supply control unit 26, 47 and a cylinder 28, 49 enclosing a piston 31, 52 which separates a chamber 29, 50 for receiving pressurized air from a chamber 30, 51 containing hydraulic fluid. Each control unit 26, 47 include an adjustable throttle 36, 57, a check valve 37, 58, an electrically controlled hydraulic valve 35, 56, and a plurality of electric switches 38, 59 electrically coupled to the hydraulic valves. The switches 38, 59 are actuated by cams 39, 60 associated with the arms 22, 43 respectively. In operation, with a carcass surrounding the drum, air is admitted to cylinder 13 to move the support 1 towards the drum and relative to the device 15. The latter part of this movement will be at a speed determined by the throttle 36 controlling fluid flow between chambers 24, 30 since arm 22 will be in engagement with the rod 21, and the movement will stop when cam 39 engages first switch 38 to move valve 35 to the "off" position. As a result of such movement the levers 22 will be urged by spring 4 to their radially outermost position. Air is then supplied to chamber 8 to move the piston 9 and pivot levers 3 to their radially outermost positions to grip the end of the carcass between the levers 2, 3. Supply of air to cylinder 16 will cause the setter 15 to move towards the drum and engage and move the levers 2, 3 radially inwardly. The chamber 8 is simultaneously vented, and subsequently the operator remotely switches valve 35 to "ON", and the support 1 and setter 15 move together towards the drum with the setter moving at a faster rate than the support 1 to effect radially inward movement of the levers 2, 3, and to finally set the bead core. Movement of the support 1 will continue until cam 39 engages the second switch 38 to switch valve 35 "OFF". Air is now supplied to cylinder 16 to move the setter 15 away from the drum, and to the chamber 8, so that the levers 2, 3 will now pivot to turn up the end of the carcass. The latter part of this movement will be at a slower rate determined by the throttle 57 due to engagement of arm 43 with rod 42. When the setter cam 60 engages first switch 59 the valve 56 is switched "OFF". The operator remotely switches valve 35 "ON" to force the levers 2, 3 towards the drum, and switches valve 56 "ON" so that the setter 15 moves away until cam 60 actuates the second switch 59 to switch valve 56 "OFF". Thus the support 1 continues to move towards the drum until third switch 38 is actuated to switch valve 35 "OFF". Further movements of the support 1 towards, and the setter away from, the drum can be effected similarly, if desired, to complete the carcass turn up.