Patent ID: 8490274

Claim:
A positioning-jig used for mounting a face plate on a female-die of a stamping machine, the positioning jig comprising: a cylindrical female-part having a plurality of protuberances in an arrowhead shape in a cylindrical outer bottom at a predetermined interval, which fits to a predetermined position of the stamping machine, a lateral concave part and another lateral concave part facing each other on a cylindrical inner surface of the female-part and extending in a circumferential direction of the female-part, and a longitudinal concave part and another longitudinal concave part facing each other on the cylindrical inner surface of the female-part and extending in a longitudinal direction of the female-part, wherein an end of the lateral concave part and an end of the longitudinal concave part are connected to form an L-shape, an end of the another lateral concave part and an end of the another longitudinal concave part are connected to form another L-shape, and the L-shape and the another L-shape are symmetrically arranged on the cylindrical inner surface of the female-part; a male-part having a size capable of being set in the female-part, and having a cylindrical axial part, a locking part and another locking part on a symmetrical position at an upper part of the cylindrical axial part, and a bottom part in a round dish shape at a lower part of the male-part, having a round concave portion extended throughout the bottom part, facing an opposite side where the female-part is attached to position the face plate with the bottom part, and a jagged non-slip part formed on an entire outer circumferential side surface of the bottom part; and a flat washer-shaped elastic body which is set on the bottom part of the male-part, wherein an inner diameter of the elastic body is larger than an outer diameter of the cylindrical axial part, an outer diameter of the elastic body is smaller than an outer diameter of the bottom part, the locking part and the another locking part fit into the longitudinal concave part and the another longitudinal concave part in a longitudinal side of the L-shape and a longitudinal side of the another L-shape respectively when the male-part is attached to the female-part, the locking part and the another locking part slide into the lateral concave part and the another lateral concave part in a lateral side of the L-shape and a lateral side of the another L-shape respectively when the male-part is rotated by a predetermined angle while the male-part is attached to the female-part, and the female-part and the male-part are locked together with a repelling force of the elastic body while the male-part is attached to the female-part.