Epson Stylus Pro 7700/7710/7700M/7710M/7900/7910/9700/9710/9900/9910/WT7900/WT7910/9890/9908/7890/7908 Revision I
OPERATING PRINCIPLES Main Body 99
Confidential
2.1.5 Paper Feed Mechanism
Figure 2-5. Paper Feed Mechanism
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Diagram Name Description
1 PF Encoder
Detects the PF Scale patterns to control the paper
feeding (operation of the PF Motor).
2
Roller Release HP
Sensor
Detects the position (Contact/Separate status) of the
driven roller.
3
Driven Roller Release
Motor Assy
Drives the driven roller. A DC motor with an encoder
scale mounted on it is employed.
4
Driven Roller Release
Motor Encoder
Detects patterns of the scale attached on the motor to
control the rotation of the Driven Roller Release Motor
Assy.
5 PE Sensor
A reflective photo interrupter to detect the presence of
paper.
6 Paper Thickness Sensor
Detects the thickness of paper being inserted into the
printer.
7 Rewind Motor
Takes up the slack of the roll paper when the motor
rotates normally, and rewinds the roll paper when it
rotates reversely. A DC motor with an encoder scale
mounted on it is employed.
8 Rewind Motor Encoder
Detects patterns of the scale attached on the motor to
control the rotation of the Rewind Motor.
9 PW Sensor
Detects the width of paper on the platen. It is a
reflective photo interrupter and detects the difference of
the amount of reflection between paper (white) and the
platen (black).
10 Cutter Sensor Detects the origin position of the cutter.
11 Suction Fans
Suck paper to the platen so as to stabilize the position of
paper when printing. Three fans are mounted for Epson
Stylus Pro 9700/9710/9900/9910/9890/9908, and two
fans for Epson Stylus Pro 7700/7710/7700M/7710M/
7900/7910/WT7900/WT7910/7890/7908.
12 Cutter Encoder
Detects patterns of the scale attached on the motor to
control the rotation of the Cutter Motor.
13 Cutter Motor
Drives the cutter. A DC motor with an encoder scale
mounted on it is employed.
14 PF Motor The motor to drive the Feed Roller.
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