Conjugate cam is a solid combination of two cams, which can be considered as one segment. Its structure is of great variety. There are two types of conjugate cam mechanism ―with/without self-locking. The former has one follower, while the latter consists of two followers. In self-locking conjugate cam, the follower is rotational or translational.
Self-locking conjugate cam mechanism is widely used in many modern machines such as high-speed textile machines, printers, cutters and machine tools for accurate kinematic transmission under high-speed and heavy loading.
Many researchers proposed synthesis methods of self-locking conjugate cam with a translational follower.
Kang Chol Su, a section head at the Faculty of Mechanical Science and Technology, has investigated a self-locking conjugate cam mechanism with a rational follower.
First, he conducted a structural analysis to calculate the minimum limit of permanent segment. Second, he proved that the ratio of the length of permanent segment to the lever with two arms depends on the feasible pressure angle, maximum displacement, movement rule and working angle.
On this basis, he built a mathematical model for the rotation center of the cam to satisfy the minimum-size condition, and gave an application example to determine the minimum radius of the cam, the initial location of the follower and the angle between levers with two arms.
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