The lengths of the links comply with the conditions: A͞B=A͞B', B͞C=B͞’E=C͞E=2.8A͞B, C͞D=E͞D=3.2A͞B, E͞H=2.8A͞B, H͞K=3.36A͞B, K͞L=2A͞B, L͞M=4.6A͞B, M͞N=M͞R=1.6A͞B, R͞P=1.2A͞B, F͞G=1.4A͞B, C͞F=5A͞B, A͞K=5.8A͞B, A͞N=12.3A͞B, K͞N=6.6A͞B, P͞N=4A͞B and K͞P=8A͞B. By means of intermediate links 2 and 3, double-crank link 1 reciprocates slider 4 along fixed guides a-a. Link 5, actuating link 6, periodically grips and releases stock b, feeding it in the required direction. The stock is regripped by link 12 (when it is released by link 6) which is connected to crank AB' of link 1 by a kinematic chain consisting of links 2, 7, 8, 9, 10 and 11. The mechanism is set up and adjusted by varying the angle between cranks AB and AB'.
$1643$SC,GC$