Patent GB-1263252-A (GB)
Title: Moulding
Inventor: CAMPRUBI BARTHOLOMEW
IPC: B29C43/00
Filed: 1968-02-16
Abstract: 1,263,252. Mould opening device. HOOVER Ltd. 14 Feb., 1969 [16 Feb., 1968], No. 7847/68. Heading B5A. [Also in Division F2]  General operation.-A transfer mould, e.g. a commutator mould, as employed in the rotary mould press of Specification 1,251,952, comprising upper, intermediate and lower parts a, b, d, is indexed over a stationary bed 10 on a rotary table 11 to successive stations 1-4 whereby, at station 1, the parts a and b are axially upwardly separated from each other and from part d by a punch 57; on movement to station 2 they are arcuately separated through opposite 90-degree movements; at station 2 a moulded commutator is downwardly discharged by a punch 61 from part b into a shoot 63, and a transfer sprue 60 in part a is cleared, into a vacuum head 78, by upward displacement of a punch pin 71 carried in the table 11; at station 3 the pin 71 is retracted from sprue 60 by a punch pin 81; at station 4 a loading arm 100 is arcuately displaced over the mould parts and a commutator shell 102 and bush 10, held thereon by spring clips, are respectively discharged therefrom, by punches 103 and 104, into the intermediate part b and on to an upstanding pin c in part d; during the return movement to station 1 the parts a and b are arcuately returned into alignment with part d through opposite 90-degree movement; at station 1 the mould is closed upon downward axial displacement of parts a and b by a punch 105. Operating mechanisms.-The punch 57 is carried by a lower plate 54 of a punch carrying assembly, including a fixedly spaced apart upper plate 53, which vertically reciprocates with respect to the table 11, the upper plate 53 carrying the punches 61, 81, 103, 104, 105, and also a punch 76 which upwardly displaces the punch pin 71 in the table at station 2 by acting on a bell crank lever connected to the pin 71, Fig. 5 (not shown). The mould parts a, b and d are externally grooved whereby they are retained for movement with the table 11 by forked carriers 34, 33 and 30, the carriers 34 and 33 being respectively fixed to shafts 40 and 41 which are axially and arcuately respectively separable to perform the separating movements of the parts a and b. Sequential separation of part a from part b and of the latter from part d is performed at station 1 by punch 57 acting on shaft 40, shaft 41 then also being displaced by the abutment of a follower 45 on shaft 41 with shaft 41 and a follower 46 carried thereby. On movement of the table 11 from station 1, the parts a and b are retained in their separated positions by the entry of the followers 45 and 46 into respective annular grooves 23 and 24 around the stationary bed 10, and on movement between stations 1 and 2 and between 4 and 1 the respective arcuate separating and returning movements of the shafts 40 and 41 are performed by pins, e.g. 117, 118 and 131 which project from the bed 10 to engage slots in the followers 45 and 46, Figs. 9 and 10 (not shown), which are thereby rotated (see Division F2). The followers 45 and 46 each have a pair of opposed convex and a pair of opposed concave surfaces whereby they are non-rotatively guided in the annular grooves 23 and 24, recesses being provided in the inner walls of the grooves 23 and 24 to permit rotation of the followers 45 and 46 by the pins, e.g. 117, 118 and 131. A device for halting the machine is associated with punch 81, should the mould sprue be blocked.