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EPSON Perfection 610 Rev. B
Operating Principles Engine Mechanism 17
2.1.2 Carriage Drive Mechanism
A line-type color CCD sensor, which is included in the carriage unit, scans one
line at a time in the main scan direction (parallel to the carriage unit). To scan
next lines in the sub-scan direction after the first line, the scanner moves the
carriage unit with the CCD sensor in it along the sub-scan direction. The
scanned data is sent to the control board. Reading image for “n” line and
processing data for “N-1” line are simultaneously performed one after another.
Figure 2-3. Carriage Movement
The carriage unit slides in the sub-scan direction along the guide rail. To slide
the carriage, the carriage (CR) motor drives the timing belt attached to the
carriage unit by conveying torque via the drive pulley and transmission gear.
Scanning start position is determined by CR HP sensor, which is located on the
control board. Since the CR motor is a stepping motor, it is controlled under the
open loop system. (See Figure 2-4.)
Figure 2-4. Carriage Operation
First Line
Second Line
1 Pixel
Main Scan
Direction
Sub Scan Direction by CR Movement
Rear
Front
Carriage Unit
CR HP Sensor
Timing Belt
Driven Pulley
Drive Pulley
Transmission
Gear
CR Motor