ABSTRACT
The change in angle α as the slide moves is assumed to be small enough relative to changes in angles θ and λ that it may be ignored. Upon taking moments about pivot B in Figure 4(b) we obtain
(1-
where
(17)
when belt tension is relaxed and where F0 is the force that either the operator or the actuator exerts at the left-hand end of link r. From the law of sines and the geometry in Figure 4, λ is related to θ according to
(18)
After substituting for δ from the second of equation (1-7) into equation (1-6) and then solving for γ from the first of equations (1-8), equation (1-6) may be rewritten as
(19)
Moving the motor away from the driven machine to begin declutching causes the belt to stretch an amount ∆c. The corresponding change in length b is given by
(1-
according to the geometry shown in Figure 4. The force acting on the sliding base during the initial declutching motion as the
linkage moves to increase the distance b may be written as
(1-
upon using relation (1-10). In equation (1-11), constant k is the spring for the belt, which is defined by k=force/elongation, hence the force required to strech the belt, which is given by k ∆c.
