国上泽通大￥ Graphical linkage synthesis 4.Link thru 3 positions as coupler A B A 国上清发大学 Graphical linkage synthesis 5.Grashoff quick return crank-rocker Quick return:goes quicker in one direction(a)than the other(B) Time Ratio TR=a/B +β=360 B=360/(1+TR) C Q Max TR of 1:1.5 B DA0 B0 A1 B1 A2 B2 A3 B3 4. Link thru 3 positions as coupler Graphical linkage synthesis C2 D A B1 C1 B2   5. Grashoff quick return crank-rocker Graphical linkage synthesis Quick return: goes quicker in one direction () than the other () Time Ratio TR= =360 =360/(1+TR) Max TR of 1:1.5