Canon iPF8000 - imagePROGRAF Color Inkjet Printer, Руководство по обслуживанию

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Chapter 2
2-8
2.3.2.3 Carriage Unit
2.3.2.3.1 Functions of Carriage unit
0012-6330
a) Printhead mounting function
The carriage, which fixes the printhead in position mechanically, is connected to the contact of the head relay PCB.
b) Control function
The carriage carries a carriage relay PCB, which relays drive signals from the main controller PCB, a head relay PCB,which relay printhead drive signals to print-
head, a linear encoder, which generates print timing signals, and a multi sensor, which detects the width of paper and skews in it, adjusts is registration and head
height.
The carriage relay PCB is connected to the main controller PCB by a flexible cable.
c) Carriage drive function
The carriage is caused to reciprocate level on the platen by means of the carriage belt that is driven by the power imparted from the carriage motor.
d) Printhead maintenance function
This printer performs cleaning operations, such as wiping the printhead and sucking inks, with the carriage halted at its home position.
e) Nozzle check function
This printer carries out an ink discharge operation with the carriage halted at the head management sensor, locating a non-discharging nozzle in the printhead.
f) Carriage height adjustment function
If the separation between the face of the printhead and the paper (carriage height) is varied as a result of differing paper thicknesses, cockled or curled paper or other
problems, the printer is liable to mist generation as the carriage height increases or to head rubbing as the carriage height decreases.
To maintain an acceptable carriage height, the lift motor is driven according to the selected paper type, feeding method, print conditions (borderless printing/prior-
itized picture quality) , environmental condition(temperature/humidity) and multi sensor measurements to automatically adjust the separation between the face of
the printhead and the paper
The table below shows the relation between the form kind and the height of the head.
T-2-4
g) Paper leading edge detection function/paper width detection function/skew detection function
The multi sensor attached to the lower left part of the carriage detects the leading edge and width of paper feeding on the platen and skews in it.
h) Automatic printhead position adjustment function
The multi sensor attached to the lower left part of the carriage reads an adjustment pattern printed on a form and adjusts the print timing of each printhead automat-
ically.
i) Remaining roll media detection function
The printer prints a bar code on roll media upon delivery. The multi sensor attached to the lower left part of the carriage indicates the remaining volume of roll media.
j) Internal unit temperature sensor
A thermistor installed on the head relay PCB detects the internal unit temperature near the printhead.
2.3.2.3.2 Structure of Carriage Unit
0012-6332
a) Printhead mount
The printhead is secured to the carriage by the printhead fixer cover and the printhead fixer lever.
When the printhead is secured to the carriage, the signal contact of the head relay PCB is pressed against that of the printhead to convey print signals.
Further, the ink passage from the ink tanks is connected to the printhead via the ink tubes.
b) Ink port
Ink is supplied to the printhead via an ink tube, which runs between the tube guides via joints to reach the carriage and follows up is motion.
Height of printhead
(mm) Media type Remarks
1.4 (Lowest) Photopaper, Synthetic paper, Film, Plain paper(Line drawing) Capping position
1.8 (Low) Coated paper(Line drawing)
2.0 (Standard) Plain paper, Coated paper, Fabric banner
2.2 (High) Premium matte paper, Fine art(watercolor,block print)
2.6 (Highest) Canvas