Epson 610 manual Carriage Drive Mechanism, Carriage Movement

EPSON Perfection 610 Rev. B

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.

Second Line	First Line
1 Pixel

Main Scan

Direction

Sub Scan Direction by CR Movement

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.)

	CR HP Sensor
Carriage Unit	CR Motor

Transmission

Gear

Drive Pulley

Timing Belt

Rear

Driven Pulley

Front

Figure 2-4. Carriage Operation

Operating Principles Engine Mechanism 17