PURPOSE: To always and surely control molten metal supplying quantity by abutting a part of a chuck holding part in a product taking-out device on end face of a biscuit part to detect the biscuit thickness, comparing this detected value with the set value and automatically correcting the molten metal supplying quantity so than the biscuit thickness comes in the range of the set value when the detected value is out of the range of the set value.

CONSTITUTION: By the action of a magnetic scale 23 and a magnetic head 24, position of the surface of a slide arm 14 at a movable plate 2 side from the surface of the movable plate 2, i.e., dimension A between these can be detected. In this case, as thickness C of the movable die 4 and distance D from the surface of slide arm 14 at the movable plate 2 side to the tip face of a bar 21 at the movable plate 2 side, are beforehand informed, by abutting the tip face of bar 21 on the tip face 6a of the biscuit part 6, thickness B of the biscuit part 6 can be easily obtd. as B=A-(C+D). Then, in the case the detected thickness of the biscuit part 6 is within the prescribed set range, it is decided that the molten metal supplying quantity into the injection sleeve is within the suitable range. The molten metal supplying quantity at the next time is properly adjusted to execute actions of the supplying and the injection of molten metal.