Module 4 : Drives and Mechanisms

Lecture 3 : Cams

2.3 Classification based on line of motion

 

Figure 4.3.7 shows the types of cams based followers' line of motion.

Figure 4.3.7 Classification of follower based on line of motion

4.3.1  Radial follower

The line of movement of the follower passes through the center of the camshaft (Figure 4.3.7 a).

4.3.2  Offset follower

The line of movement of the follower is offset from the center of the cam shaft (Figure 4.3.7 b).

3.  Force closed cam follower system

In this type of cam-follwer system, an external force is needed to maintain the contact between cam and follower. Generally a spring maintains the contact between the two elements. The follower can be a oscillating type (Figure 4.3.8 a) or of translational type (Figure 4.3.8 b). Figure 4.3.8 shows the typical arrangements of the same.

 

Figure 4.3.8 Force closed cam followers

4.  Form closed cam foller system

In this system a slot or a groove profile is cut in the cam. The roller fits in the slot and follows the groove profile. These kind of systems do not require a spring. These are extensively used in machine tools and machinery. The follower can be a oscillating type or translating type. Figure 4.3.9 shows the schematics of these types of cam-follower arrangements.

 

Figure 4.3.9 Form closed cam followers