Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 37

EPSON Stylus COLOR 680/777/77i
When the paper is advanced with
the PF roller, Change lever push
down the Clutch lever as right
figure and the Clutch lock tooth is
disengaged from the Clutch gear.
As the result, the drive from the PF
motor is interrupted and the LD
roller dose not rotate.
This position is the ASF home
position.
The Paper return plate is set to
avoid that the paper is slipped
down from the paper set position.
The PF motor pinion gear rotates
CW direction and the drive from the
PF motor is transmitted to the ASF
LD roller shaft through the Clutch
lock tooth and the Clutch gear.
The ASF hopper release lever rotates
with the ASF LD roller and release
the ASF Hopper. The ASF hopper is
pushed with the Compression spring
4.80 and the paper is picked up with
the ASF LD roller.
Operating Principles
Step 1
LD roller
LD roller shaft
Paper return plate
Change lever
Clutch gear
Clutch lever
Clutch
Step 3
PF motor pinion
gear CW rotation
ASF Hopper
release lever
LD roller shaft
ASF hopper
PF motor pinion
release lever
gear CW rotation
Figure 2-11. ASF Paper Loading Sequence
Hopper
Printer front side
Clutch lock tooth
PF motor pinion
gear CCW rotation
Compression
spring 4.80
ASF Frame
Paper return plate
PF motor pinion
gear CW rotation
Overview
Step 2
When the paper is loaded (pick up) from
the ASF unit, the Change lever moves to
the printer front side with the CCW
rotation of the PF motor pinion gear and
releases the Clutch lever. As the result,
Tension spring 0.143
the Clutch turns back to the engagement
position by the tension force of the
Tension spring 0.143.
And the Clutch lock tooth is engaged
with the Clutch gear as right figure.
Step 4
The ASF LD roller rotates CW direction
moreover and the Paper return plate is
stored under the ASF frame.
The paper is advanced up to the PF roller.
and the ASF LD roller & the clutch rotate
to the "Step1" position. The Clutch lever
is locked with the Change lever.
The drive from the PF motor is
interrupted and the drive is transmitted to
the PF roller side.
Revision B
37