Operating Principles - Epson Stylus CX4900 Service Manual

EPSON Stylus CX4900/CX4905/CX5000/DX5000/DX5050/CX5900/CX6000/DX6000/DX6050
When the PF Motor pinion
gear rotates CCW direction
(right side view), the
Hopper release cam
Change Lever pushes down
the Clutch lever as right
figure and the Clutch lock
LD Roller Shaft
tooth is disengaged from
the Clutch Gear. As the
LD Roller
result, the LD Roller Shaft
dose not rotate at all
because the drive of the PF
Paper Back Lever
Motor is not transmitted. In
this time, the Hopper is also
Torsion spring 6.45
pushed down by the two
cams on the LD Roller
Shaft, and the Paper Back
Lever is set to avoid that Spur Gear 13.5
(PF Roller)
papers are slipped down
from the paper set position.
This position is the ASF
home position.
<PF Motor drive transmission path for ASF home position setting>
PF Motor pinion gear (CCW) → Spur Gear 30.8 (CW) →
Spur Gear 32.4 (PF Roller) (CCW) → Spur gear 13.5 (PF Roller) (CCW) →
Combination Gear 21.24 (CW) → Spur Gear 27.2 (CCW) →
Spur Gear 16 (CW) → Change Lever (CW) →
Combination Gear 27.2, 19.2 (CCW) → Spur gear 36.8 (CW)
* Above transmission pass = seen from the right side of the printer

OPERATING PRINCIPLES

Step 1 (ASF Home position)
Hopper & Paper Back Lever condition
Hopper
Compression
Spring 5.58
ASF Frame
Gear rotation direction (Right side view)
Change Clutch Clutch Clutch
lever lever
Clutch lock tooth
Figure 2-7. ASF paper loading sequence (Step 1, 2)
Hopper & Paper Back Lever condition
Gear rotation direction (Right side view)
gear
<PF Motor drive transmission path for ASF home position setting>
PF Motor pinion gear (CW) → Spur Gear 30.8 (CCW) →
Spur Gear 32.4 (PF Roller) (CW) → Spur gear 13.5 (PF Roller) (CW) →
Combination Gear 21.24 (CCW) → Spur Gear 27.2 (CW) →
Spur Gear 16 (CCW) → Change Lever (CCW) →
Combination Gear 27.2, 19.2 (CW) → Spur gear 36.8 (CCW)
* Above transmission pass = seen from the right side of the printer
Printer Mechanism
Step 2
When a paper is loaded
from the ASF Unit, the
Change Lever moves to the
front side of the printer with
the CW rotation (right side
view) of the PF Motor
pinion gear and releases the
Clutch lever. As the result,
the Clutch turns back to the
engagement position by the
tension force of the
Extension Spring 0.143.
And, the Clutch gear is
engaged with the Clutch
lock tooth to transmit the
drive of the PF Motor as left
figure. In this time, the
Extension Spring
Change Lever is locked
To Front side
0.143
instantaneously by the
protrusion on the backside
of the Carriage Unit to
change over from the ASF
home position detection
function to the paper
loading function surely.
Revision A
72