The Synthesis of a Hook Drive Cam Mechanism

Cam mechanisms are very important mechanical objects which are used in the design of various machinery. Their application can be found, for example, in machine tools, textile, printing, sewing machines, etc. This mechanical object was used in the design of a sewing machine hook drive. The hook drive is composed by a four-bar linkage and a cam mechanism with radial conjugate cams and an oscillating roller follower. The main aim of the kinematic synthesis was to determine the optimal characteristic parameters of the cam mechanism hook drive. As the criterion for the determining of the most appropriate dimensions, it was chosen the pressure angle course in the proposed mechanical system. Another goal of the computational analysis was the determining of the cam mechanism dynamic behavior and properties, which are expressed in the Hertzian pressure course and estimated rating life of curve roller bearings.