be seen that the extracting device of the present invention is connected alongside a heat moulding apparatus illustrated schematically a similar extraction device is provided on the other side of the machine where there is a heat moulding apparatus having two stacking stations in fig1 the heat moulding apparatus has a base 8 with supporting columns 9 for slidably guiding a plate 10 and bearing a carriage 11 carrying the lower half of a mould 12 12 39 below the part 12 of the mould are members 13 for supporting a cylinder 14 of a double acting piston the rod 15 of which see fig3 effects the expulsion of frusto conical cups 16 from the recesses 17 of mould 12 in which they had been formed the cups 16 are expelled by the action of a plate 18 engaged by rod 15 and displaceable in the cavity 19 on which rods 20 are supported terminating in expulsion plates 21 upon the expulsion of the cups 16 from the mould 12 they are then stacked in the stacking station or magazine formed by a plate 22 secured by bolts with nuts 23 to a plate 24 rigidly connected to the frame of the heat moulding apparatus the stacking of a series of cups 16 is monitored by a stroke counter 25 39 actuated by a switch 26 39 said stroke counter is calibrated so as to close a pair of contacts not illustrated in the drawings whenever the stacks of cups 16 have reached the number to be removed from the stacking station the switch 26 39 may be installed on the stacking station without departing from the scope of possible embodiments of the invention cylindrical recesses 25 are provided on the plate 22 for receiving the lower.