The "Movement fidelity condition" is an important prerequisite and foundation for cam mechanism achieving the desired output.Shape-locking conjugate cam mechanisms which removing spring and other auxiliary parts can reduce energy consumption

reduce wear and increase abrasion resistance and prolong life

so it has more significant advantages than force-locking mechanism.On the basic of using supporting function to solve "Movement fidelity condition" and other issues of Ftype force-locking mechanism

it is also succeeds in expanding and generalizing the "Supporting function" to shape-locking conjugate cam mechanism with negative radius translation follower

the radius of curvature and "movement fidelity conditions" of the cam mechanism are derived and obtained.An important foundation for further research and application of the new type shape-locking conjugate cam mechanism with negative radius translation follower is provided.