Platen Gap Adjustment Components; Platen Gap Mechanism; Platen Gap Mechanism Drive Components - Epson Stylus Pro 4400 Service Manual
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EPSON Stylus Pro 4400/4450/4800/4880/4880C
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
PG/PO Motor
Spur Gear, 16
Planetary Holder (Spur Gear, 20, Planetary)
Planetary Holder (Spur Gear, 16, Planetary)
Combination Gear, 56, 8.8
Combination Gear, 40, 20
Spur Gear, 36
CR Shaft Pulley (rear)
Carriage Shaft (rear)
Figure 2-18. Drive Transmission Path
Operating Principles
Timing Belt
CR Shaft Pulley (front)
Carriage Shaft (front)
Printer Mechanism Components
CR Shaft Pulley (front)
Spur Gear, 36
Carriage Shaft
(front)
Timing Belt
Combination Gear, 40, 20
Combination Gear, 56, 8.8
Planetary Holder
(Spur Gear, 16,
Planetary)
Figure 2-19. Platen Gap Mechanism Drive Layout
Spur Gear, 36
Timing Belt
Carriage Shaft
(front)
CR Shaft Pulley (front)
Combination Gear, 40, 20
Combination Gear, 56, 8.8
Figure 2-20. Platen Gap Mechanism Drive Components
Revision C
CR Shaft Pulley (rear)
Carriage Shaft
(rear)
PG/PO
Motor
Spur Gear, 16
Planetary Holder
(Spur Gear, 20,
Planetary)
Carriage Shaft
(rear)
CR Shaft Pulley (rear)
PG/PO Motor
Spur Gear, 16
Planetary Holder
Planetary Holder
(Spur Gear, 16,
(Spur Gear, 20,
Planetary)
Planetary)
128
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