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2.3.
FOOT PEDAL
6
Fig.
2.4.
Foot Pedal
The pedal contains a potentiometer which is turned by the pedal
movement, and two microswitches which are controlled by cams on
the potentiometer axle.
The microswitches control the selection of four different operating
modes, three of which are found in distinct pedal positions: free, fully
down, and lifted to a mechanical stop. The fourth mode is covered by
the range between free and the mechanical stop, and the potentiome-
ter becomes significant in these pedal positions.
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