Paper Loading Mechanism (Asf Unit) - Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual

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EPSON Stylus COLOR 680/777/77i

2.1.5 Paper Loading Mechanism (ASF Unit)

The Paper loading mechanism is positioned at the printer rear. The Paper loading
mechanism loads paper at the ASF unit and feeds paper to the PF roller.
This ASF unit was designed newly for this product and consists of LD roller, Pad
holder (Paper return plate), ASF Frame, Hopper, and so on.
For the major feature of this ASF unit, ASF HP sensor is not used and the single LD
roller is built in the ASF unit.
Drive sent from the PF motor is always transmitted to the ASF unit side. But, the
Change lever and the Clutch mechanism switch ON/OFF the PF motor drive to the LD
roller with the motor rotational direction.
Drive from the PF motor is transmitted to the ASF unit as described below:
o
Switch the PF motor drive to ASF unit side
PF Motor pinion gear rotates CCW direction with a specific steps
Gear 16, 21.6 (CW)
Spur Gear 73.6(CCW)
Combination Gear 37.6, 44.4 (CCW)
the Clutch mechanism lock position
Following Figure 2-7 shows you the switching path for PF motor drive to ASF unit
side.
Figure 2-7. Switch the PF motor drive to ASF unit side
Operating Principles
Combination
Spur Gear 15(CW)
Change Lever rotates (CCW)
Spur Gear 35.2
Change Lever
Spur Gear 23.2
Spur Gear 15
Combination Gear
37.6, 44.4
o
Transfer the PF motor drive to LD roller
PF Motor pinion gear rotates CW direction
Spur Gear 73.6 (CW)
(CW)
Change Lever rotates (CW)
(CW) (include the clutch mechanism)
Following Figure 2-9 shows the PF motor drive transmission path to the LD roller unit
built in the ASF unit. The LD roller is assembled on the same shaft that the Spur gear
35.2 is assembled.
Release
Figure 2-8. PF motor drive transmission path
When the PF motor torque is switched to the ASF unit side by the clutch mechanism,
the function of the ASF mechanism varies depending on the rotational direction of the
PF motor, as shown in the table below.
Table 2-3. ASF unit function & PF Motor rotational direction
Directions
Clockwise (*1)
Counterclockwise (*1)
(*1): The PF Motor rotational direction = seen from the right side of the printer.
o
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.
Overview
Combination Gear 16, 21.6 (CCW)
Spur Gear 15 (CCW)
Combination Gear 37.6, 44.4
Spur Gear 23.2 (CCW)
LD roller (CW).
Change Lever
Spur Gear 15
Corresponding Functions
• Picks up and loads paper
• Release the DE lever & Clutch mechanism
Revision B
Spur Gear 35.2
Spur Gear 35.2
Spur Gear 23.2
Combination Gear
37.6, 44.4
35

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Stylus color 680Stylus color 777iStylus color 777

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