Toshiba ESTUDIO170F, Service Manual

Page: 197 / 492

5
January 2005 © TOSHIBA TEC e-STUDIO170F Mechanical Description
5 - 5
[ 1 ] Document Support Area
The document support area is the area for setting documents to be transmitted. The document sizes
that can be transmitted are fixed paper sizes such as A4, Letter and Legal. (Refer to
P.2-1 "2.1
Scanning System".)
[ 2 ] ADF Area
The ADF area consists of the ADF roller, ADF pad, Document sensor and Document position sensor.
When the Document sensor detects the presence of document, the ADF roller automatically pull the
document to the Document position sensor.
• ADF roller
The ADF roller is driven by the TX motor and automatically feeds the document pages to the TX
drive rollers. The feed speed of the ADF roller is slower than the TX drive rollers.
Accordingly, a one-way clutch is attached to the ADF roller, to allow the ADF roller to turn freely in
one direction.
• ADF pad
The ADF pad prevents more than one document page from being fed when multiple pages of
documents are loaded for transmission. It feeds pages one by one utilizing friction.
• Document sensor
When a document is set in the document support area, the sensor turns ON and detects the
presence/absence of the document. The document sensor is located on the rear side of the
operation panel. (Refer to
P.6-9 "6.4.1 Sensor Layout")
• Document position sensor
This sensor detects the document top and bottom edges at the CIS unit. When the top edge is
detected, the unit goes to the standby mode, during a multi-page transmission, it detects the
beginning of a new page. When the bottom edge is detected, the unit determines the length of
time since the last top edge to decide if a document jam is occurred.
During a multi-page transmission, the bottom edge of the last page detects the end of the trans-
mission. (Refer to
P.6-9 "6.4.1 Sensor Layout")
[ 3 ] TX Drive Area
The TX drive area consists of the TX motor, TX motor gear assembly, TX drive rollers, and pinch rollers.
The TX drive area feeds the document pages sent in from the ADF area.
• TX motor gear assembly
The TX motor gear assembly is driven by the TX motor.
The TX motor gear assembly drives TX drive rollers and ADF roller.
• TX motor
The TX motor is the power source for the transmission section. When the document sensor
detects the presence of document, the TX motor rotates to feed the document pages. When the
document pages reach the document position sensor, the TX motor is turned OFF.
Thereafter, it will rotate again by a signal from the operation panel.
• TX drive rollers 1 and 2
The TX drive rollers feeds the document sent in from the ADF roller to the specified position.
By the signals from the operation panel, the rollers feed the document to the scanning area by
single scanning width value.
Thereafter, the rollers feed out the document that has gone through scanning. The rollers are
driven by the TX motor.