For the general swing roller follower cam mechanism

the pendulum is a straight rigid rod and pendulum length is fixed

therefore

by using reversal method to analytical design the cam profile is relatively easy.The cam mechanism involved in this article

the structure shape of the swing-rod is irregular and the distance between the pendulum rod center and the follower roller center is constantly changing with the cam angle

which makes the application of reversal method for solving the cam profile becomes complicated.To solve this problem

the structure and characteristics of swing double roller follower disc cam mechanism are described

the concept of equivalent pendulum rod is proposed

using geometric method to solving obtain the length expression for equivalent pendulum rod

and then based on principle of reversal method to design the cam profile.Has important reference value and guidance for the design of the same type mechanisms cam profile curve.