259,733. Pollak, J. E., (Owens Bottle Co.). Sept. 8, 1925. Blowing. - A machine of the Owens type has a number of moulds, preferably two, on each head or unit, and they are arranged to travel in substantially the same path and to be dipped into the rotating tank simultaneously. Each mould preferably has a number of moulding-cavities, and the knives for cutting off the string of glass after gathering are arranged to prevent the chilled end of glass from falling back into the gathering area. Specification 251,138 is referred to. The machine, as usual with Owens machines, comprises parison moulds E, Fig. 1, and ring moulds D mounted on a frame B which reciprocates vertically to enable the parison moulds to gather glass from a rotating tank 133. The moulds are arranged in heads or units which radiate from, and rotate around, a central stationary column 62 to which are fixed the cams that operate the various parts of the machine. Each head supports two sets of moulds, and each mould has a number of moulding cavities. All the moulds are arranged so that the moulding cavities travel in the same path H, as shown in Fig. 2, and glass of the same temperature and consistency is supplied to all the moulds. Parison and ring moulds.-The parison moulds E comprise sections 80, 81, Fig. 7, carried respectively on frame members F, G which slide horizontally within the frame B to move the mould sections to and from one another. The members F, G are interconnected by racks 86 and pinions 87, so that they move in unison, and equalizing bars 110, 114 ensure that the sections of each mould are completely closed and centred. A coil spring is interposed between the member G and the cam roll which operates it to prevent breakage of the parts if the movement of the mould is obstructed. The ring mould halves are hinged together and are opened and closed in unison. The frame B which carries the ring and parison moulds is counterbalanced by a weight 145, Fig. 1, and is raised and lowered by a stationary cam 134 operating a slide block 136 and a bell-crank lever 141. The plunger tips 151, which form the initial blow openings in the parisons, are carried by rods 166 which are reciprocated vertically by toothed segments 168 oscillated by a stationary cam 175. The segments 168 are formed with cam tracks 182 which slide blowheads over the ring moulds when the plunger tips 151 have been lifted out of the parisons. Cutting-off excess metal. - The cutting mechanism, for severing the string of glass below the parison moulds, comprises knives 194, Figs. 1 and 7, on arms 195 which are secured to rock shafts 196. The two knives on each unit or head are operated successively, the cutting-stroke taking place as each mould reaches the position indicated by the radial line 210, Fig. 2. Thus the chilled glass severed from the mould falls into the tank 133 at a point outside the gathering area. The two knives may, however, be operated simultaneously. When making a cut, the knives are in contact with the bottoms of the parison moulds, but they are then moved downwards through a short distance and remain below the mould while the parisons are being blown in the moulds. Gathering.-The machine gathers by suction as usual with Owens machines, the parison moulds being connected by pipes 235, 236, Fig. 1, with a pipe 237 leading from a distributing-head 366 to a vacuum chamber 238. A valve at the lower end of the pipe 235 is operated by a stationary cam 244 and a spring 243 to control the suction in the moulds. A rod 255 is provided to enable each valve to be kept closed, so that any parison mould may be prevented from making a gather when it is desired to run the machine at less than full capacity, or for other purposes. Finishing moulds. - The finishing moulds for each head or unit are carried by a frame 261, Fig. 1, having trunnions 262 by which it is pivoted on the machine body, and it is raised into and lowered from the blowing-positions by a fixed cam track 263. Each frame carries a pair of moulds, and the links for opening and closing the moulds are adjustable in length and are also operated through equalizing levers to ensure proper closing and centering of the moulds. Removing formed articles.-A pair of " knockout arms 292 is carried on each finishing- mould frame and each arm carries a series of discs 293 which temporarily hold the bottles during the opening of the finishing-moulds. Shortly before the moulds open, the arms are swung inwardly and downwards on to the bottles. When the moulds have opened, the arms are lifted and swung outwards, and the bottles fall by gravity from the moulds as the arms are lifted. The discs 293 may be adjusted either to release the bottles simultaneously or in succession. Air supply.-Air for cooling the moulds and other parts of the machine is supplied through a pipe 321 and passage 324 and chambers 326 formed in the frame of the machine. The air is led through the hollow arms of the finishing moulds and is blown on to the moulds, and the supply of air may be cut off automatically when the moulds are opened. The parison moulds are cooled by nozzles carried on the finishing-mould frame. A distributing-head 366 comprises three separate chambers which communicate respectivelv with an air chamber 367, a vacuum chamber 238, and a gas chamber 368 that rotate with the machine. The pressure chamber 367 communicates with the blowheads through a pipe line 369.