1. 1 Preliminary Concepts A cam mechanism is a mechanical system
consisting of three basic components: a driving element, called the
cam; a driven element, termed the follower; and a fixed frame.
Sometimes, an intermediate element is introduced between the cam
and the follower with the purpose of improving the mechanism
performance. This element is called the roller because function is
to produce a pure-rolling relative motion be tween the cam and the
follower. The purpose ofa cam mechanism is the transmission of
power or information. In applications concerning power
transmission, the main good to be transmitted is force or torque;
in applications ofinformation transmission, the main good
transmitted takes the form of motion signals. Most modern appli
cations of cam mechanisms, to be described shortly, are of the
former type. Cam mechanisms used for information transmission were
traditionally found in measuring instruments. With the advent
ofmodern microprocessor-based hardware, this typeof application is
becoming less common. Nevertheless, cam mechanisms are still used
in a wide spectrum of applications, especially in automatic
machines and instruments, textile machinery, computers, printing
presses, food-processing equipment, internal combustion engines,
control systems, and photographic equipment (Prenzel, 1989). In the
design of cam mechanisms, the engineer performs several activities,
namely, task definition, synthesis, analysis, optimization, and
dynamic simulation. These tasks do not always follow this order. In
fact, some loops may appear in the foregoing tasks, such as those
illustrated in Fig. 1. 1. 1."
General
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