Epson Stylus CX7300 Service Manual page 57

EPSON Stylus CX7300/CX7400/DX7400/NX200/TX200 series/SX200 series/Stylus CX8300/CX8400/DX8400/NX400/TX400 series/SX400 series Revision C
2.2.1.2 Scanner Carriage Unit Movement Overview
Scanning image is performed in the main scan direction (=1 line) by the CIS board and
in the sub-scan direction (=several lines) combined with Scanner Carriage Unit
movement. (refer to the figure below) The CIS board can scan 1 line in main scan
direction (parallel to the Scanner Carriage Unit) by one time. When scanning next lines
after the second line in sub-scan direction, CR driving moves the Scanner Carriage
Unit, and scan the other lines. The scanned data is sent to the control board. The
scanned data for "n" lines and "n-1" line are processed consecutively.
1st line 2nd line
Scanner Carriage
Unit
Sub-scan direction by Scanner Carriage Unit movement
Figure 2-22. Scanner Carriage Unit movement
OPERATING PRINCIPLES
Document 1 pixel
Main-scan
direction
Scanner 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.
Right side
Figure 2-23. Scanner Carriage Unit Mechanism
Left side
Scanner Motor
Scanner Carriage Unit
Confidential
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