Davin J012, Service Manual

Page: 299 / 365

The high volume ink cartridges and the carriage components are extremely lightweight.
A print head tank has four main parts as shown above:
• Ink supply port. Ink enters here from the ink cartridge mounted under the operation panel.
• Ink reservoir. This is where ink collects before it is fed to the print head below.
• Plastic bellows. A spring forces out the flexible, thin plastic film on the left side of the ink tank.
• Ink level lever. When the ink tank is mounted in the printer, this lever pushes the bellows down to
increase pressure in the ink reservoir. The ink level sensor mounted on the carriage detects the position
of these arms to determine the amount of ink remaining in a tank. (The actuator spreads outward when
the bellows gradually collapses as ink is consumed.)
• Air release valve. Purges air periodically to keep the ink inside the ink tank unit under the prescribed
pressure and the amount of air in the tank low.
The illustration above shows the arrangement of the print heads and print head tanks.
• Two print head tanks are mounted on one print head unit.
• Each print head tank unit feeds to its own nozzle array (one for each color).
• Each print head tank holds 4.3 ml of ink.
Ink Ejection Device
Each print head uses a piezo-electric element (PZT) . This forces ink from the ink reservoirs out of the ink
nozzles and onto the paper.
6. Detailed Section Descriptions
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