MX-M950, MX-MM1100 (serv.man18). Details of Each Section - F Paper Transport Section - Sharp Copying Equipment Service Manual (repair manual). Page 3

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MX-M1100  PAPER TRANSPORT SECTION  F – 3
2. Operational descriptions
A. Outline
The paper transport section serves the function of transferring
paper from each paper feed port to the registration roller section.
Paper from paper feed tray units 1 and 2, paper feed tray 3 and
paper feed tray 4 is transported vertically to the registration roller
section.
The detection of double-feed is done before transferring paper to
the registration roller, and the check of the off-center is carried out
by the image position sensor.
After the leading edge of the paper is synchronized with the leading
edge of the drum image in the registration roller section, the paper
that is transfer printed with the image in the transfer section passes
through the fusing section and is discharged either face-down or
face-up.
[Operation of Image position sensor]
It detects the position of the paper transferred by the contact image
sensor (CIS) and automatically adjusts the off center.
• CIS: Contact Image Sensor
It is a contact image sensor integrated with the light source, the
lens (Selfoc ) and the sensor.
B. Paper transport operation
Straight-Through Path (No Inversion, No Duplexing)
The paper transported from the each tray section is sent to the
paper exit roller (which is driven by the paper exit motor (POM))
with the transport roller). 
Paper transportation speed
C. Paper face-down output operation
Invertion Path (Face-down Output, No Duplexing)
When face-down print is selected, the paper is passed under the
Face-up/face-down select gate. 
After paper passing, the paper exit gate guide falls down by its own
weight. 
When the specified time has passed from detection of the paper
lead edge by Face down reverse detection, Paper exit reverse
motor (SBRM) rotates reverse direction in the specified time. (The
rotation time differs depending on the paper size.)
D. Double-feed sensor operation
(1) Outline of the operation
The double-feed sensor is incorporated in the paper transport sec-
tion of 110/95 ppm machine, and it detects double feed.
Paper transport stops when double feed is detected.
Ultrasonic generator generates ultrasound during paper transport.
The level of reception of the ultrasonic sensor largely changes
(decreases) when double feed occurs. Double sheet feed is
detected in this method.
Image position sensor
Double feed
detection
1
1
2
Face-up/face-down select gate
Unit (mm/s)
110 / 95CPM
85 CPM
: Normal speed
540
400
(Process speed)
: High speed 
600
500
(Paper feed and exit speed)
: High speed 
1000
1000
(Switchback speed)
1
2
3
1
3
3
2
2
Face down reverse detection
Face-up/face-down select gate
solenoid OFF-Up, ON-Down
ADU gate solenoid
OFF-Left, ON-Right
Paper
(1 sheet)
(Double feed)
Ultrasound
Ultrasonic
generator
Secondary
radiation
Reflect
Ultrasonic
sensor
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