EPSON Stylus CX4300/CX4400/CX5500/CX5600/DX4400/DX4450 Revision A
OPERATING PRINCIPLES Scanner Mechanism 29
2.3.1.2 Scanner Carriage Unit Movement Overview
Image is scanned in the main scanning direction (=1 line) by the CIS board and in the
sub-scanning direction (=several lines) combined with Scanner Carriage Unit
movement. (See the figure below.)
The CIS board can scan 1 line in main scanning direction (parallel to the Scanner
Carriage Unit) at one time. When scanning next lines after the second line in sub-
scanning direction, CR driving moves the Scanner Carriage Unit, and scan the lines.
The scanned data is sent to the control board. The scanned data for “n” lines and “n-1”
line are processed consecutively.
Figure 2-5. Scanner Carriage Unit movement
The table below shows the specifications for the stepping motor that controls the
Scanner Carriage Mechanism.
Drive of the Scanner Motor is transferred to the Scanner Carriage Unit by the Scanner
Timing Belt. The Scanner Carriage Unit slides in the secondary scanning direction.
The Scanner Motor uses a stepping motor and drives using open loop control.
Figure 2-6. Scanner Carriage Unit Mechanism
Table 2-4. Scanner Motor specifications
Item Description
Motor type PM type stepping motor
Drive voltage 42V (DC)
Coil resistance 37Ω ±10% (per phase at 25 degrees)
Inductance TBDmH ± TBD%
Driving method PWM
Driver IC L6219
1st line 2nd line 1 pixel
Main-
scanning
direction
Sub-scanning direction by Scanner Carriage Unit movement
Document
Scanner Carriage
Unit
Left side
Right side
Scanner Motor
Scanner Carriage Unit
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