圈上海文大华 Mechanism inversion Tangent Mechanism Sine Mechanism Elliptical Trammel Mechanism 正切机构 正弦机构 双转块机构 椭圆机构 圈上游充大些 Mechanism inversion(机构倒置) Inversion:grounding a different link in the kinematic chain d Double-crank Double-rock Crank-rocker 88 Tangent Mechanism 正切机构 Sine Mechanism 正弦机构 双转块机构 Elliptical Trammel Mechanism 椭圆机构 Mechanism inversion Crank-rocker Double-crank Double-rock Inversion: grounding a different link in the kinematic chain Mechanism inversion(机构倒置)