圈上泽文通大华 Cam-follower Type ▣Joint closure types >Force closure Requires external force be applied to joint to keep cam and follower in contact >Form closure Closes joint by geometry,No external force required 4 用 -Track or groove Form-closed cam with Force-closed oscillating follower © 上海充廷大学 Cam-follower Type Common motion constraint types >Critical Extreme Position(CEP) Design specifications define the start and finish positions of follower Does not specify any constraint on path between extreme positions >Critical Path Motion(CPM) Path motion and/or derivatives defined overall or part of motion interval Analogous to function generation in the linkage design 66 Joint closure types Force closure • Requires external force be applied to joint to keep cam and follower in contact Form closure • Closes joint by geometry, No external force required Cam-follower Type Force-closed Form-closed cam with oscillating follower Common motion constraint types Critical Extreme Position (CEP) • Design specifications define the start and finish positions of follower • Does not specify any constraint on path between extreme positions Critical Path Motion(CPM) • Path motion and/or derivatives defined overall or part of motion interval • Analogous to function generation in the linkage design Cam-follower Type