Epson Stylus Color 440, Service Manual

Page: 51 / 212

EPSON Stylus Color 440/640/740 Revision A
Chapter 2 Operating Principles 51
[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.
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.
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.
Figure 2-9. Paper Feed Mechanism
ASF Roller Drive Gear
Planetary Gear
ASF Roller Transmission Gear
Platen Roller Drive Gear
Platen Roller Transmission Gear
PF Motor Pinion Gear
Eject Roller
Transmission Gear
Eject Roller Drive Gear
Paper Pick Up
Trigger Lever
Eject Notched Roller
Eject Roller
PF Roller
Support Roller
Paper
Print Head
Bottom Margin 3 mm
Touch on the print head surface.
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[Stylus Color 440,640,740]
Platen
Steady
5 degrees