Epson Stylus Color 640 Service Manual page 51

EPSON Stylus Color 440/640/740
[2. Paper pick up mechanism]
When the Load/Eject switch is pressed or printing order is input, the
carriage unit moves until the left edge and collides with paper pick up
trigger lever. When the carriage collides with this trigger level, a
planetary gear located on the same axis is also pushed at the same
time and conveys the motive power on the platen to the adjoined gear
line side for ASF drive.
ASF Roller Drive Gear
Planetary Gear
ASF Roller Transmission Gear
Platen Roller Drive Gear
Figure 2-8. Paper Pick up Mechanism
[3. Paper feed mechanism]
After papers in the ASF receive controls from pick up and multi feed
prevention mechanism, they are sent to the printer inside. The papers
picked up by paper roller in the ASF goes to between platen and roller
support. Also, the eject roller pushes out the paper completely until the
end and the roller support drops the paper in the eject tray. The eject
roller is driven with an eject paper notched roller as pair where is
located on the paper eject roller.
Chapter 2 Operating Principles
Paper Pick Up
Trigger Lever
Eject Roller Drive Gear
Eject Roller
Transmission Gear
PF Motor Pinion Gear
Platen Roller Transmission Gear
Paper eject notched roller solves the deflection of paper that is in the
between platen eject notched roller and paper eject roller and always
keep a certain space between print head and paper surface. For an
unique point, the securing angle of Eject Notched Roller has been
changed by 5 degrees compared with the previous products. Due to this
change, the bottom margins of these printers are expanded from 14 mm
to 3 mm.
[Previous]
Print Head
Eject Notched Roller
Paper
Eject Roller
Platen
[Stylus Color 440,640,740]
5 degrees
Figure 2-9. Paper Feed Mechanism
Revision A
Support Roller
PF Roller
Bottom Margin 3 mm
Touch on the print head surface.
Steady
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