Drive Mechanism Operation - Epson Perfection V700 Photo Service Manual

EPSON Perfection V700 Photo

2.1.3 Drive Mechanism operation

Carriage Drive Mechanism Operation
A document is scanned in two directions. The primary direction is right-
to-left along a single-pixel-wide line parallel to the carriage, between the
lamps. Subsequent lines are scanned in the secondary direction by
moving the carriage. See Figure
To maximize performance, the scan-light beam data are processed by
the ISN board while the next line is being scanned.
1 pixel
Main
scanning
Sub scanning (by Carriage movement)
Figure 2-4. Carriage Movement
Operating Principles
2-4.
Second line
First line
Document
Scanner Head
(Carriage)
The Carriage Unit slides along the guide shaft in the secondary scanning
direction. The CR (Carriage) Motor transmits its drive power to the CR
Drive Belt attached to the Carriage Unit, via the Drive Pulley and
Deceleration Gear.
under open loop control. The image data scanning start position is
determined by the CR Home Position (HP) Sensor located on the
Control Board.
Drive Pulley
Engine Operation Outline
See Figure 2-5. The CR Motor is a stepper motor
Carriage Unit
CR HP Sensor
Front
CR Drive Belt
CR Motor
Deceleration Gear
Figure 2-5. Carriage Operation
Revision A
Carriage shaft
Driven Pulley
Rear
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