
3-8
Confidential
3.2.2 Printing Mechanism
The printing mechanism consists of the following.
Ink supply and ink jet mechanism (
Head maintenance mechanism (
)
Carriage drive mechanism (
Paper pulling-in, registration, feeding and ejecting mechanisms (
)
Duplex print mechanism (
) (for duplex print models)
The
ink supply mechanism
supplies ink to the head/carriage unit, in which the
ink jet
mechanism
sprays ink droplets from the head nozzles onto paper.
The major components of the ink supply mechanism (shown on
) are:
- Ink refill assembly: This secures the ink cartridges and connects them to the corresponding
ink supply tubes.
- Ink supply tubes: These supply the head/carriage unit with ink fed from the ink cartridges via
the ink refill assembly.
The major components of the ink jet mechanism (head/carriage unit shown on
) are:
- Front end: This is an ink-jet head consisting of piezoelectric plate (PZT), metal plates, nozzle
plate, and head driver.It jets out ink to produce images on paper.
- Back end: This consists of damper assemblies and air vent unit. Each damper assembly
dampens the ink pressure fluctuations in the corresponding ink supply tube and collects air
bubbles that result from pressure changes on the ink.
To keep the optimum head performance, the
head maintenance mechanism
(shown on
) uses the rotational torque of the ASF motor
*1
to cap the head nozzles in order to prevent
them from drying up. It also uses the rotational torque of the paper feed motor to purge for
removing air bubbles from the head/carriage unit and wipe off any ink remaining on the head
nozzle surface.
The
carriage drive mechanism
(shown on
) moves the head/carriage unit with a
carriage motor (DC motor) along the recording paper. The CR encoder sensor mounted on the
head/carriage unit scans the CR encoder strip and monitors the current head position relative to
the home position and the current travel speed.
The
paper pulling-in, registration, feeding and ejecting mechanisms
are driven by the ASF
motor
*1
and paper feed motor (both are DC motors).
The major components are:
- Paper trays #1
*2
and #2:
This machine supports two paper trays, allowing different
sizes or types of paper to be loaded.
- Paper pull-in rollers and LT paper pull-in rollers (shown on
These pull in paper into the machine. The paper pull-in
rollers are for paper tray #1
*2
, and the LT paper pull-in
rollers for paper tray #2.
- Bank ASSY and LT bank ASSY (shown on
These separate paper, sheet by sheet to feed it into the
printing section. The bank ASSY is for paper tray #1
*2
, and
the LT bank ASSY for paper tray #2.
*1
ASF motor: Auto Sheet Feeder motor
*2
DX paper tray #1 for duplex print models
Содержание DCP-6690CW
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