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1. An adjusting apparatus for a device having a bracket, comprising:
a shaft comprising a securing portion, a shank portion, and a cam portion adapted to contact the bracket, the cam portion comprising a first outer edge and a second outer edge connected to the first outer edge, the cam portion defining a pivoting axis, the securing portion extending from the cam portion and the shank portion extending from the securing portion to enable the securing portion to be located between the cam portion and the shank portion along the pivoting axis, wherein a distance between the first outer edge and the pivoting axis is less than a distance between the second outer edge and the pivoting axis; a gear passed through by the shaft portion to be secured to the securing portion, and comprising a plurality of teeth; a rack comprising a plurality of lateral slots engaging with the plurality of teeth, wherein the rack drives the gear and the shaft to be rotated; a grommet, a securing hole is defined in the grommet; and a securing element, the securing element comprising a connecting portion and two fixing portions extending from opposite sides of the connecting portion; wherein the shaft comprises a securing portion, and a securing opening is defined in a center of the gear engaging the securing portion; the securing portion is extended in and engages with the securing opening in a direction substantially perpendicular to a rotating direction of the gear; the shank portion comprises a stopper portion at a free end of the shank portion, and the elastic element is coiled around the shank portion between the stopper portion and the securing portion; a cutout is defined in the stopper portion to divide the stopper portion into two parts; the securing hole engages the stopper portion; and the two fixing portions are received in the cutout to engage with the grommet.
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