Abstract: A matching method and apparatus for the automatic cutting of patterned fabrics by an integrated marking and cutting system first defines matching points in each of the patterns of panels to be cut and digitizes these points so that the coordinates and respective identification codes for each of the points are recorded in a memory. Matching relationships are then defined for the matching points which unequivocally fix the position which the design must be in at each of the matching points and digitizes and records these relationships in the memory. Separation margins between the panels in their distribution are then established either automatically or interactively on the basis of the previously defined matching relationships and a vision sensor is then automatically positioned over the spread patterned fabric which is to be cut in the positions of the matching points which have been defined for each one of the panels which have been distributed for cutting.

Abstract: In a preferably cylindrical sheet metal casing to be hermetically sealed and having a thinwall portion, the improvement in a vent for the casing which ruptures when internal casing pressure exceeds a given value, the vent including at least one vent-forming rib projecting outward from a circular end wall thereof, said rib having formed therein a vent-forming groove which extends transversely of the length of the rib only part way along the transverse contour thereof, so that the groove ends are spaced from the base of the rib preferably a distance at least equal to the end wall thickness.