Adf Mechanism Overview; Paper Feed Mechanism; Sensors; Document Size Detection By Two Document Width Sensors - Epson AcuLaser CX11 Service Manual

EPSON AcuLaser CX11/CX11F

2.3.2 ADF Mechanism Overview

The ADF of this product is designed to feed original document to be scanned by the
fixed CCD Sensor in the scanner unit and allows up to 50 sheets of document (when
2
the paper basic weight is 80g/m ) to be loaded and scanned automatically. The
documents are scanned in paper feed direction while they are fed by the ADF. The key
mechanisms of the ADF are as follows.

PAPER FEED MECHANISM

ADF Motor : The four-phase pulse motor with 96 poles drives the paper
feed mechanism that transports document loaded on the
document tray to scanning section.
Clutch : Switches on and off the Pick up Roller by transmitting or not
transmitting the ADF Motor drive. The clutch is turned on to
transmit the motor drive to the Pick up Roller when the DOC
sensor is ON at the point of starting scanning operation.
Pick up Roller : Picks up document one by one and transports it to the next
mechanism.The roller lowers and contacts with document to
feed it by ADF Motor drive when scanning operation is
started with the DOC sensor ON. When the leading edge of
the document is detected by the RS Sensor, the roller moves
upward to return to its standby position.
Separation Roller : Located under the Pick up Roller to prevent multi-feed of
documents.
Turning Roller : Transports document fed by the Separation Roller to the
scanning position. This roller turns at a speed according to
the print resolution so that scanning in paper feed direction
can be performed properly.
Exit Roller : Transports document that has been scanned and transported
by the Turning Roller to the eject tray. Also changes the
position of the document stopper lever inside the document
tray.
OPERATING PRINCIPLES

SENSORS

DOC Sensor
AS Sensor
RS Sensor
ADF Cover Sensor
Document Width Sensor: Detects the positions of the side edge guides on the
Table 2-4. Document Size Detection by Two Document Width Sensors
Edge Guide Position
Letter size
A4 size
B5 size
Scanner Operating Principles
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: Detects whether document is loaded on the document
tray or not. The document should be loaded with its
leading edge contacting with the guide for it, or the
sensor cannot detect the document.
: Detects that document is transported to the Separation
Roller after starting scanning operation.The sensor turns
ON when it detects the leading edge of the document,
and turns OFF when it detects the posterior end of the
document. Scanning operation for the next document is
started if the DOC Sensor is ON when the AS Sensor
becomes OFF.
: Detects whether document is on the Turning Roller or
not. Scanning document is started when the document is
transported by prescribed steps from when its leading
edge is detected by the RS Sensor.
: Detects whether the ADF cover is opened or closed. The
sensor turns ON when the ADF Cover is opened and
stops the ADF Motor and turns off the clutch.
document tray. The two Document Width Sensors,
located at the position different from each other, detects
document size (width) by combination action of them as
follows.
B5 Sensor LT Sensor
OFF ON
OFF OFF
ON OFF
Revision B
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