The lengths of the links comply with the conditions: A͞B=A͞C, B͞G=C͞F and B͞D=C͞E. When slider 7 moves to the left, links 1 and 2 advance symmetrically toward each other, performing the pressworking operation. Due to the two degrees of freedom, the forces applied to links 3 and 4, and 5 and 6 are always equalized.
$1633$SC,HP$