Intermec ColorCoder V4 Service Manual page 50

2.3 Ink Supply System, cont'd.
2.3:A Outline, cont'd.
BJ Head
Restoration tub unit
Ink cartridge
Ink tank
Intermec ColorCoder V4 – Service Manual Ed. 1
Outline of Operation, cont'd.
Operation of Circulation Mode
This operation will be executed during Cleaning 4.
This mode circulates the ink between the sub-tank and the BJ head
to refresh the ink inside the head. This will eliminate the bubbles in
the BJ head and prevent the ink from becoming gummy(sticky).
During this circulation mode, the open/close latch of the sub-tank
is opened and the pressure pump and the suction pump are driven
by pressurizing the pressure/release cam. Then, the pressure pump
executes the pressure operation and the suction pump executes the
suction operation. The ink supply pressure of the pressure pump is
slightly higher than the return pressure (ink circulation pressure) of
the suction pump, so that this pressure difference creates an inside
pressure in the BJ head.
The recovery pump executes the suction operation in order to return
the ink exhausted to the restoration tub into the sub tank.
T ube
station
Air buffer
Pressure cam
home position
Needle block
Pump retainer
Recovery pump
Figure 2-33
Chapter 2
Pump motor
M
Cam
pressure
C.C.W.
release
clutch
sensor
Suction
clutch
Suction
pump
Pump
retainer
Pressure
Pressure
clutch
pump
One way
clutch
Recovery pump
home position
sensor
Operation and Timing
Breather
unit
Outlet
Release value
Inlet
SL
Latch lever
(Down)
Filter unit
Sub tank
Latch
solenoid
(Pull)
49