Pump Unit - Intermec ColorCoder V4 Service Manual

2.3 Ink Supply System, cont'd.
2.3:B Pump Unit
Pressure clutch
Recovery pump home
position sensor
Intermec ColorCoder V4 – Service Manual Ed. 1
Outline
The pump unit contains three pump systems, three electromagnetic
clutches, and one DC motor. Each pump is driven by the DC motor,
and ON/OFF of the pressure and suction pumps is controlled by the
two clutches. The pressure/release cam is driven by the cam clutch
to press and release the tubing of the suction and pressure pumps
through the pump retainer. These are controlled by the engine 1
PCB.
Suction pump
Suction clutch
Pump motor
Recovery pump
Pressure pump
The pressure pump is driven by engaging the pressure clutch while
the pump retainer presses the tubing of the pump. By switching the
rotating direction of the pump motor, ink is supplied either from the
cartridge to the sub-tank or from the sub-tank to the BJ head.
Suction pump
The suction pump is driven by engaging the suction clutch while the
pump retainer presses the tubing of the pump. Only sucking
operation is excuted.
Recovery pump
The recovery pump is connected to the pump motor via the one-way
clutch, and the pump is driven only when the motor runs in the
counter-clockwise direction. With the recovery pump home posi-
tion sensor, the pump always stops at the position of the released
condition without no roller.
Chapter 2
Pressure pump
Pump retainers
Pressure release cam
Figure 2-36
Operation and Timing
Cam
pressure
release
clutch
Pressure cam home
position sensor
52