Workpiece positioning device positioning workpiece at two reference surfaces

A workpiece positioning device comprising:

• a first positioning block that forms a first reference surface in a first direction, and positions one surface of a workpiece at the first reference surface;
• two second positioning blocks that form a second reference surface in a second direction, and position a different surface of the workpiece at the second reference surface;
• at least one seat block that positions the workpiece in a third direction perpendicular to the first direction and the second direction;
• a push cylinder that presses the workpiece in one direction toward an intersection line between the first reference surface and the second reference surface;
• a first unit that, before the first positioning block contacts with the workpiece, contacts with the one surface of the workpiece at friction lower than that of the first positioning block, and corrects a posture of the workpiece;
• and
• a second unit that contacts, before the second positioning blocks contact with the workpiece, with the different surface of the workpiece at friction lower than that of the second positioning blocks, and corrects the posture of the workpiece;
• wherein the first unit includes a first pressing member, which is pressed in the first direction toward the workpiece by an elastic member, and at least one pair of first rollers, which are attached to a distal end of the first pressing member and contact with the one surface of the workpiece, the first positioning block is arranged between the at least one pair of first rollers, and
• wherein the second unit includes a second pressing member, which is pressed in the second direction toward the workpiece by an elastic member, and at least one pair of second rollers, which are attached to a distal end of the second pressing member and contact with the different surface of the workpiece, the at least one pair of second rollers are arranged between the two second positioning blocks.