Dispenser Functional Description
Pick Modules
1-12
NCR 5635 Spray Currency Dispenser Service Manual
NCR - CONFIDENTIAL AND PROPRIETARY
Use pursuant to Company Instructions
In the case of a failure to pick a bill, the pick solenoid stays
energized for an additional three or four cycles. After the first
failure to pick, the firmware searches for another cassette of the
same currency denomination. The search order is from cassette
position 1 downwards. If the pick sensor still does not detect a bill,
there is a delay of one second, to allow the vacuum to build up, and
then another pick attempt is made. If this fails, there is a further
delay of ten seconds and one more attempt is made to pick a bill. If a
bill has not been picked after three attempts of four or five pick
cycles, a status code identifying the pick failure is sent to the PC
core.
Pick Mechanism
Operation
1
After receipt of a valid dispense command, the dispenser motor is
switched on to drive all the dispenser transport sections, swing the
pick arms back and forth, and drive the vacuum pump.
A plastic disk printed with timing marks is attached to the drive
cam that imparts the oscillating motion to the pick arms. A cut out
section of the disk forms a timing arc which is detected by an optical
switch and is used (ANDed with a signal from the currency
dispenser control board) to produce the electrical pulses that
energize and de-energize the pick solenoid valve. The solenoid
valve is energized following a transition through sensor clear to
sensor blocked and it remains energized while the segment on the
disk is obscuring the optical sensor. This time corresponds to the
time when the pick arms are just reversing away from the currency
in the cassette until they are above the pick wheels of the transport.
When the solenoid valve is de-energized it closes off the pump
section of tubing. The tubing to the pick arm vents to atmosphere
via backflow through the de-energized solenoid. The note drops off
the suction cups and is gripped by the pick and pressure wheels.
The letter D and numbers 1, 2, 3, and 4 printed on the timing disk
are used to set and check the timing of individual pick modules and
this adjustment is described in the “Adjustments” section of
Chapter 4.
master.bk Page 12 Wednesday, March 27, 2002 9:35 AM
