$1\mathrm{.}125*$ The arrangement shown in Fig. $1\mathrm{.}122$ is used to regulate the weight of material fed from a

hopper to a conveyor $[1\mathrm{.}44].$ The crank imparts a reciprocating motion to the actuating rod

through the wedge. The amplitude of motion imparted to the actuating rod can be varied by

moving the wedge up or down. Since the conveyor is pivoted about point $O,$ any overload

on the conveyor makes the lever $OA$ tilt downward, thereby raising the wedge. This causes a

reduction in the amplitude of the actuating rod and hence the feed rate. Design such a weight$-$

regulating system to maintain the weight at $40+-4N$ per minute.

DESIGN PROJECTS

FIGURE $1\mathrm{.}122$ A vibratory weight$-$regulating system.