The arrangement shown in Fig. 1.122 is used to regulate the weight of material fed from a hopper to a conveyor [1.44]. 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 \(O A\) 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 weightregulating system to maintain the weight at \(40 \pm 4 \mathrm{~N}\) per minute.

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Crank A LLLLL Wedge LILL 7777 Actuating rod FIGURE 1.122 A vibratory weight-regulating system. Pivot point Hopper 0 Conveyor