Patent GB-1480308-A (GB)
Title: Rotary moulder for forming products of a resilient material
IPC: B29C45/00
Filed: 1975-11-14
Abstract: 1480308 Rotary moulding machines NIPPON OIL SEAL INDUSTRY CO Ltd 14 Nov 1975 [14 Nov 1974] 47091/75 Heading B5A A rotary moulding machine comprises an upper mould part carried by an upper stationary base, a lower fixed base, an intermediate movable base, and a rotatable mould holder located between the upper and intermediate bases. The mould holder carries either intermediate mould parts successively co-operable with the upper mould part and a lower mould part on the lower base to form an injection, compression, or transfer mould, or lower mould parts successively co-operable with the upper mould part to form an injection, compression or transfer mould. In operation the mould is closed by raising the intermediate base which in turn raises the mould holder. In a first embodiment, a device for injection moulding reinforced sealing rings comprises an upper fixed base 36 a lower fixed base 50, an intermediate base 52 vertically reciprocable by an hydraulic cylinder 51 or a toggle, and a mould holder 56 rotatably mounted about a column 14 on a sleeve 46 and located between the upper and intermediate bases. An upper mould part 42 fed by an injection device 34 is carried through insulating and heating plates 38 and 40 on the upper base, a lower mould part 43 is similarly carried upon the intermediate base, and a pair of intermediate moulds parts 68, 69 is carried by the mould holder. The mould holder is biased downwardly by a spring 66 and is rotatable to bring first one intermediate mould part and then the other into alignment with the upper and lower mould parts. Reinforcing rings 196 are fed to the intermediate mould part not in the moulding position by a pusher 152 which pushes the rings on to a base 81 which pivots to transfer the rings to an hydraulically actuated ring insertion member 74. The base 81 carries a first kicker 160 for removing a moulded ring from the ring insertion member on to a take-off shoot and a second kicker 78 for removing the moulded ring from the intermediate mould part on to the ring insertion member. In use, a reinforcing ring is supplied to the ring insertion member and the member raised to locate the ring in the intermediate mould part. The mould holder is then rotated to bring the mould part to the moulding position and the intermediate base is raised to close the mould (see Figs. 2-3) after which injection takes place. After injection, the intermediate base is lowered to open the mould and the mould holder rotated to bring the intermediate mould part plus moulded article back over the ring insertion member. The second kicker is lowered to push the moulded ring down on to the ring insertion member and as the base 81 pivots to place another ring on the insertion member so the first kicker knocks the moulded ring into the take-off shoot. Before the mould holder is rotated after injection, the flash is pushed upwardly away from the injected ring by a spring biased ejector rod, is gripped by a pair of fingers 86 mounted upon a pivoted rod 84, and is transferred over and dumped on to a take-off conveyer 144. The intermediate mould part is held upon the mould holder by a pair of diametrically opposite spring biased pins which engage a peripheral groove in the mould part. A spring biased third pin engages an aperture or recess in the mould part to prevent pivoting of the part, and flanges on the mould part periphery are engaged under flanges carried by the mould holder. In a second embodiment, the mould holder carries lower mould parts, the lower base being devoid of a mould. In this embodiment the reinforcing rings are pushed directly on to a core carried by each lower mould part and are ejected from the lower mould part by the ring insertion member 74 which acts in this ease to push the core and mould ring upwardly proud of the lower mould part where it can be swept from the core by the next fed ring.