7
BILL RECOGNITION
When a bill is inserted into the bill acceptor and it blocks
the left and right alignment sensors as well as the center
optic sensor, the transport motor begins to run.
BILL VALIDATION
From the time the transport motor begins to run until the
trailing edge of the bill leaves the alignment sensors,
optical and magnetic sensors send information to the
microprocessor to determine the validity of the bill.
BILL STACKING AND CREDIT
If the bill is determined to be authentic, it is transported to
the stack position. Once the sensors of the lower
housing’s anti-pullback lever signals the microprocessor
that the bill is in the stacking position, the stacker motor
runs and credit is given.
BILL REJECTION
If the bill is determined to be invalid, the wrong denomi-
nation or the anti-pullback levers are active when the bill
is determined to be in the stack position, the transport
motor will reverse returning the bill to the customer.
COMPONENT EXPLANATION
(see Figure 3)
Bill Transport and Stacking
The bill transport system is composed of a motor and
gearcase assembly and two sets of pulleys and belts.
When the transport motor is energized, it pulls the bill in
by sandwiching it between the lower housing rollers and
the chassis belts. During the validation process, the bill is
transferred from the lower housing rollers and chassis
belts to the intermediate frame and rollers.
The bill stacker is composed of a motor and gearcase
assembly and a pusher plate assembly. When the bill is
transported past the anti-pullback levers into the stacking
position, the stacker motor energizes driving the pusher
plate, which in turn, pushes the bill into the bill box.
Left and Right Alignment Sensors
The left and right alignment sensors send information to
the microprocessor to insure that the bill is the right width
and that it is being fed in correctly.
Center Optic Sensor
The center optic sensor informs the microprocessor that
the bill is ready to be transported if the information from
the alignment sensors is correct.
Left and Right Optic Sensors
The left and right optic sensors and associated circuitry
perform various optical checks on the bill and send that
information to the microprocessor for bill validation.
Magnetic Sensor
The magnetic sensor and its associated circuitry per-
forms checks on the magnetic properties of the bill and
sends that information to the microprocessor for bill
validation.
Anti-Pullback Lever
The lower anti-pullback lever is optically monitored to tell
the microprocessor when the bill has entered the stack
position or if an attempt to defraud the unit is taking
place.
Stacker Home Sensor
The stacker home sensor is an optical sensor that
informs the microprocessor of the position of the stacker
pusher plate.
Encoder Sensor
Connected to the transport motor is an encoder wheel
which is optically monitored to determine the speed of
the transport motor and to determine the position of the
bill in the bill path.
SECTION 3: OPERATION
