EPSON Stylus Pro 4400/4450/4800/4880/4880C
Revision C
Operating Principles
Printer Mechanism Components
128
2.2.4.2 Platen Gap Adjustment Components
The Carriage Unit (= Print Head) installation position must always maintain a
fixed distance from the paper surface in order to preserve printing precision.
The Carriage Unit is supported by 2 Carriage Shafts. The Carriage Unit moves
up and down with the rotation of the Carriage Shafts because of the eccentric
bushings attached to both ends of each Carriage Shaft. This movement
changes the gap between the Print Head surface and the Platen surface.
Main platen gap adjustment mechanism components and their functions are
explained in the following sections.
PLATEN GAP MECHANISM DRIVE
Figure 2-18. Drive Transmission Path
Figure 2-19. Platen Gap Mechanism Drive Layout
Figure 2-20. Platen Gap Mechanism Drive Components
Spur Gear, 16
PG/PO Motor
Combination Gear, 56, 8.8
Combination Gear, 40, 20
Carriage Shaft (rear)
Spur Gear, 36
CR Shaft Pulley (rear)
Timing Belt
CR Shaft Pulley (front)
Carriage Shaft (front)
Planetary Holder (Spur Gear, 20, Planetary)
Planetary Holder (Spur Gear, 16, Planetary)
CR Shaft Pulley (front)
Spur Gear, 36
CR Shaft Pulley (rear)
Carriage Shaft
(front)
Timing Belt
Combination Gear, 40, 20
Combination Gear, 56, 8.8
Carriage Shaft
(rear)
PG/PO
Motor
Planetary Holder
(Spur Gear, 16,
Planetary)
Planetary Holder
(Spur Gear, 20,
Planetary)
Spur Gear, 16
Carriage Shaft
(front)
Timing Belt
Spur Gear, 36
Carriage Shaft
(rear)
CR Shaft Pulley (rear)
CR Shaft Pulley (front)
Combination Gear, 40, 20
Combination Gear, 56, 8.8
PG/PO Motor
Spur Gear, 16
Planetary Holder
(Spur Gear, 20,
Planetary)
Planetary Holder
(Spur Gear, 16,
Planetary)
Summary of Contents for Stylus Pro 4800 Portrait Edition
Page 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 113: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 156: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 200: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Page 366: ...C H A P T E R 5 ADJUSTMENT ...
Page 448: ...C H A P T E R 6 MAINTENANCE ...
Page 457: ...C H A P T E R 7 APPENDIX ...