MAINTENANCE UNIT
J001/J003 6-18 SM
6.5.2 MAINTENANCE UNIT
Overview
The maintenance unit does two important functions:
• Keeps the surface of the print heads moist when they are not in use.
• Cleans the print heads with suction when you do cleaning with the printer driver.
(The print heads are also cleaned automatically at prescribed intervals.
The caps [A] cover the print heads. This occurs when the carriage remains at the
home position on the right side of the printer.
The first cap [B] 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.
In order to perform the siphon procedure, the machine will:
• Lower the maintenance unit
• Move the carriage to the left. This sets the print head for cleaning (for more, see
next page).
The maintenance motor [C] rotates forward. Then it lowers two cams to let them
press against the bottom to lower the unit. Then it reverses at the prescribed time.
When the motor reverses, it disengages a one-way clutch attached to the main
shaft. Then it drives the second shaft to rotate the cam of the tube-pump
mechanism.
At the prescribed time, the motor rotates forward again until a feeler on the main
shaft enters to the gap of the maintenance HP sensor [D]. Then the motor is
switched off.
Another cam attached to the main shaft raises and lowers the wiper [E]. The wiper
cleans the surface of the print head as the carriage moves left and then right.
G707D921.BMP
[C]
[D]
[E]
[B]
[A
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