Davin J012, Service Manual

Page: 313 / 365

• Cleans the print heads with suction during print head cleaning. (The print heads are also cleaned
automatically at prescribed intervals.
Caps [1] and [2] cover the print heads when the carriage is at the home position on the right side of the
printer.
• Cap [2] is the only cap that can siphon excess ink from a print head. The ink gets siphoned from the
head with a simple, pressure tube-pump mechanism.
During print head cleaning:
• The maintenance motor [4] runs forward. Two cams lower the bottom of the unit.
• Next, the motor reverses. When the motor reverses, it disengages a one-way clutch attached to the
main shaft. This allows it to rotate a second shaft that rotates a cam against the side of the plastic tube.
This alternating pressure and release on the side of the tube comprises a very simple pump mechanism.
• At the prescribed time, the motor runs forward again until a feeler on the main shaft reaches the gap
of the maintenance HP sensor (located at [5] (but not shown). This switches the motor off.
• Another cam attached to the main shaft raises and lowers the wiper [3]. The wiper cleans the surface
of the print head above as the carriage moves left and then right.
Maintenance Unit Cleaning Cycle
The operator can start the cleaning operation from the printer driver or the operation panel. You can Print
Head 1 or Print Head 2 (or clean them both) if you start the clean job with the printer driver.
Cleaning starts with the carrier and print heads capped and resting on top of the maintenance unit as shown
above.
6. Detailed Section Descriptions
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