Oki IP-6620 Maintenance Manual page 522

Chapter 8 Operation Mechanism
This chapter describes the operation mechanisms and operations below:
(1) Operation mechanisms
- media feeding system
- carriage system
- ink system
(2) Operations
- electrical control system
- engine controller firmware
8.1 Overview of System Operation Mechanism
(1) From media setting to print completion
The media roll set in the printer is fed by the grit roller and passes through the platen in x direction. Then
inks of various colors are injected from the piezo-type print heads which pass through the platen block in y
direction so that the printing is performed. The ink fed to the print heads is supplied directly from ink
cartridges via tubes. On the platen, suction fans suck the media to keep an appropriate distance between
the media and the print heads.
The print heads are mounted on the carriage, are operated by the carriage motor via a steel belt, and move
back and forth horizontally on the printer.
The print head position is detected using a linear scale, a linear encoder, and a home position sensor.
When the print operation completes, capping unit performs the capping operation automatically.
(2) Service station
Service station is equipped to prevent:
- damages by staining of the head surfaces; and
- drying by leaving the print heads not used for a long period.
The operations at the service station are:
- Cleaning the print head surfaces with a wiper; and
- Print head surfaces protection by aspiration and capping using the capping unit.
(3) Heaters and sensors
To improve performance, the printer is equipped with the three heaters on the positions below.
Media feediing side: Preheater for pre-heating media
Below the platen:
Media output side:
Besides, the two sensors below operates to detect trouble such as media jam.
Media feed unit:
Media output unit:
Printheater for ink penetration and fixing
Afterheater for drying
Media feed sensor
Media output sensor
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