GB1494743A - Moulding apparatus - Google Patents

Abstract

1494743 Rotary table moulding and vulcanizing machine DUNLOP Ltd 14 April 1975 [16 April 1974] 16519/74 Heading B5A A ribbon 10 of unvulcanized rubber or plastics is fed, e.g. from a mill 11 to a series of moulds 9 (only one shown) mounted for rotation about a vertical axis on a turntable 2 and arranged to be opened and closed by toggles controlled by cams 40 carried by a frame 13. Upper and lower mould halves 30, 32, Fig. 2, are mounted on upper and lower rings 28, 31 attached to discs 3, 4 forming the turntable. Each upper mould half 30 is attached to a plunger 29 sliding in the upper ring 28 and connected to a toggle mechanism contained in a box 34. The toggle is operated by a roller 94 (Fig. 4, not shown) engaging an arcuate cam track 40 to close the mould about the ribbon 10 to form an 0-ring. The mould is opened and closed several times to vent trapped air and then continues round the table while the 0-ring is vulcanized. When the mould is opened the 0-ring is ejected either by compressed air supplied by a shoe 45 which contacts the lower mould half 32, or by an ejector pin 46 passing through the lower mould half and operated by a cam track 48. The 0-ring is discharged down a shoot 15 to a conveyer 16 and may be assisted by air from nozzles 57 which also spray lubricant on the open mould. If the ejector pin 46 is omitted the central plug of scrap may be ejected downwardly through the lower mould half 32 into a shoot 14 by compressed air supplied through the upper plunger 29 from a shoe 44. The ribbon 10 is guided to the moulds by a frame 43 and is returned to the mill. Hot oil is supplied to the moulds through the rings 28, 31 which are connected via pipes 74 to 77 to a rotary union 73 on top of the turntable drive shaft 7.