A series of intermeshing gears is called a gear train.
Intermeshing gears turn in opposing directions.
In a gear train we have a gear known as the driver and one known as the follower.
Driver - is the gear that has the force or motion input.
Follower - is the gear that results in the force or motion output.
It may be noted that when the number of intermediate gears are odd, the motion of both the gears (i.e. driver and driven or follower) is in the same direction.
But if the number of intermediate gears are even, the motion of the driven or follower will be in the opposite direction of the driver
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