GB841143A - Method of and apparatus for lifting upper and lower box moulds off a pattern plate, and conveying away the finished box, in turntable foundry moulding machines - Google Patents

Abstract

841,143. Moulding-machines. BADISCHE MASCHINENFABRIK AKTIENGESELLSCHAFT SEBOLDWERK. Aug. 23, 1956 [Aug. 24, 1955], No. 25837/56. Class 83 (1). A method, in turntable moulding- machines, of lifting upper and lower boxes of a moulding-box from a pattern-plate, and subsequently conveying away the finished half-mould, comprises lifting the pattern-plate and box rapidly relatively to the turntable, and thereafter first separating the box slowly from the pattern-plate and then moving it rapidly upwardly for lowering on to a short roller-conveyer for removal, after which the pattern-plate is again lowered on to the turntable, all the operations taking place one after the other and automatically. The machine comprises a turntable 10 and a lifting-off-station IV. The stripping-device at station IV comprises an outer cylinder 18 containing a piston 21 supporting a table 15 carrying lifting-pins 22, and an inner piston 19 carrying a table 16 on which the pattern-plate 1 and mould-box O are supported. Guide-rods 66 attached to the table 16 pass through stops 20, and incorporate dashpot devices 67. The piston 19 is normally held at the top of its stroke in the chamber 64 by pressure-air from the line 28. In operation, pressure-air is fed beneath the piston 21 so that the tables 15, 16, with the pattern and box thereon, rise from the turntable 10 at the speed of movement of the piston 21. When the dashpot devices 67 engage the stops 20, the table 16 is slowly brought to a standstill, relative movement of the tables causing the pins 22 to slowly lift the box from the pattern. After movement of the table 16 has stopped, the box moves from the pattern at the speed of movement of the piston 21. Towards the end of the upward movement of the box, rails 70, Fig. 3, upon which the stripping-pins 22 are supported, are moved by engagement of a cam-follower 38 in a cam groove 40,. allowing the pins 22 to descend from ramps 69 on the rails and thereby deposit the box on to a roller-conveyer 68 carried by the table 15. Operation of a limitswitch 41 in the top position causes removal of the flask from the conveyer 68 to an adjoining conveyer, by actuating a pusher. When the box has left the conveyer 68, actuation of a limit-switch 43 causes the piston and pattern to be restored to their initial positions for commencement of another cycle.