Gears of first stage are changeable so that the operator can change the gear ratio based on current field condition.

This paper brings out feasibility and applicability to make change drive of double step sliding gear by moving one gear width along axis under conditions of Corresponding ratio of gear.

Then the locus curves of one point in the geared five-bar were studied with the change of the gear ratio, the phase Angle, the bar length and the Angle between two bars.