Epson STYLUS COLOR 480, Service Manual

Page: 38 / 149

EPSON Stylus COLOR 480 Revision B
Operating Principles Overview 38
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Clutch Mechanism
Unlike the previous products, this product dose not have a ASF HP sensor.
Instead of the ASF HP sensor, Change lever and the Clutch mechanism are used to
detect the ASF home position. Following figures describe the mechanism.
Figure 2-10. Disengage & Clutch mechanism
The Clutch mechanism transmits the PF motor drive to the LD roller shaft only when
the Clutch gear rotates CW direction after the Change lever releases the Clutch lever. If
the Clutch gear rotates CCW direction, the PF motor drive is not transmitted to the LD
roller. This is due to the combination of the shape of the Clutch gear and the Clutch
lock tooth such as described on the figure.
1. When the paper is advanced with the PF roller, the Change lever is set on the Clutch
lever and the Clutch is pushed down as above Step1’s figure. As the result, the Clutch
gear (*1) is released from the Cluck lock tooth and the drive from the PF motor is not
transmitted to the LD roller shaft.
2. When the PF pinion gear rotates CCW direction in the above Step2’s figure, the
Change lever moves to the left direction with the CCW rotation of Combination gear
11.2, 32.4. The Clutch turns back to the engagement position by the tension force of
the Tension spring 0.143 and the Clutch gear is engaged with the Clutch lock tooth as
above Step2’s center figure.
3. When the PF pinion gear rotates CW direction in the above Step3’s figure, the Change
lever moves to the right direction with the CW rotation of the Combination gear 11.2,
32.4. And the drive from the PF motor is transmitted to the LD roller shaft via Clutch
gear and Clutch lock tooth.
4. The LD roller shaft rotates about 360 degree and the Change lever push the Clutch
lever and the PF motor drive is interrupted. This position is the ASF home position.
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Paper Return Plate (Pad holder)
Unlike the previous products, The Paper return plate is built in the ASF frame instead
of the Paper return lever. The Paper separation pad is also stacked on the plate.
It works with the spring force of the Torsion spring 28.9 (mounted in the ASF frame)
as following figure.
Figure 2-11. Paper Return Plate
The Paper return plate is set to return the paper to the paper stand-by position in the
ASF unit when the ASF unit is in the standby mode. When the paper is fed with the
LD roller, the Paper return plate is stored in the ASF frame by the LD roller.
Change Lever
Clutch gear
Clutch
Step1
Step2
Step3
Clutch lever
Clutch lock tooth
Tension spring 0.143
LD roller shaft
Spur gear 35.2
NOTE:
The Clutch gear is molded on
the back side of the Spur gear
35.2 such as Combination gear.
LD roller
ASF frame
Torsion spring 28.8
Paper Return
Plate
Hopper
Compression spring 2.67