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product button is pressed, the timing circuitry activates a coil in the basket lift relay to supply power
to the motor.
There are two types of basket lifts: the “bell crank” design, and the “modular” design
A bell crank basket lift consists of a cam and
bell crank that are connected to the basket lift
arm by a flat metal link. The cam is attached
to a drive motor. The motor rotates the cam,
thus raising or lowering the lift arm linked to
the bell crank. A roller-activated microswitch
is used to limit travel. When the push-button
in the manual timer or the product button for
computers is pushed, the motor circuit is com-
pleted and the motor runs, lowering the bas-
ket. When the roller in the microswitch
makes or loses contact with the cam, the
switch is reversed and power to the motor is
cut. At the end of the specified cooking time,
the timer/controller reverses its switch posi-
tion so that the motor circuit is again com-
plete. The motor runs, raising the basket, until
contact with the cam is again made or lost.
Left bell crank and cam with basket lift link shown in the
down position. Note the microswitch in the upper right
corner.
NC
NO
C
NO
NC
L
TM
C
M
NO
NC
C
NO
NC
L
TM
C
M
N
H
LEFT BASKET
LIFT TIMER
RIGHT BASKET
LIFT TIMER
LEFT BASKET
LIFT MOTOR
RIGHT BASKET
LIFT MOTOR
LEFT
MICROSWITCH
RIGHT
MICROSWITCH
Bell Crank Basket Lift
Simplified Schematic
When the timer button is pushed, the NO circuit in the timer is closed,
supplying voltage through the microswitch to the motor. The bell
crank/cam rotates until switch postition in the microswitch is reversed,
stopping the motor with the basket in the down position. When the timer
reaches zero, the the switch in the timer reverts to the NC position. This
supplies power to the motor via the microswitch. Once again, rotation
of the bell crank/cam eventually causes the microswitch to reverse
itself, stopping the motor with the basket in the up position.