In Figure P1.7 a variable-stroke drive, which is a combination of two four-bar linkages, is shown. The driving member rotates the eccentric, which, through the linkage, causes the output link to rotate a fixed amount. The ratchet on the output shaft transfers motion in one direction only. Thus, on the return stroke, the output link overrides the output shaft. As a result, a pulsating motion is transmitted to the output shaft, which is needed in many applications, such as feeders and mixers. A smoother drive can be produced by mounting on the same shaft the same device but with some shift in phase with respect to the first one. A continuously variable drive can be designed by mounting a few of such devices on the same shaft and using the control link to change the position of the adjustable pivot.
a. Perform a complete kinematic analysis for one position of the adjustable pivot. Plot velocities and accelerations of the output link over the cycle.
b. Animate the motion.
