EPSON Stylus PHOTO 810/820/830

Revision B

2.1.5.2 Pump unit mechanism

The PF motor also controls the Pump unit mechanism (including the Change lever) as well as the Paper loading/feeding mechanism. The drive of the PF motor is always transmitted to the Pump unit. (And also, its drive is transmitted to the LD roller through the Clutch mechanism & the Change lever.)

On this printer, the Pump unit mechanism including the Change lever plays a major role expecting the ink eject operation. And, these operations control depending on the PF motor rotational direction as the following table below.

Table 2-5. PF motor rotational direction & Ink system mechanism

Directions (*1)

 

Functions

 

 

 

Clockwise

• Absorbs the ink by the Pump unit

Release the Change lever from the Clutch mechanism

 

 

 

 

Counterclockwise

Non operation

 

 

 

(*1): The PF motor rotational direction = seen from the left side of the printer.

1.Ink eject operation (usual operation)

The ink is absorbed from the ink cartridge, the ink cavity and is ejected to the Waste drain ink pad from the cap when the ink tube is pressed by a roller in the Pump unit.

Following figure shows you the overview of the Pump unit mechanism operation

Cap unit side

Waste drain

 

Ink pad side

(*1): The PF motor rotational direction = seen from the right side of the printer.

Figure 2-13. Pump mechanism

 

Left side view

Cap unit

Right side view

 

Pump unit

Spur Gear 35.2

Spur gear 60

Spur gear 60

 

Change Lever

 

 

(PF roller)

(Paper eject roller)

 

 

 

 

 

PF roller

Combination

Gear 16.32

Combination

Spur Gear 25.6

Gear 18.28

PF motor pinion gear

Spur Gear 27.2

(Pump Unit Gear)

 

Transmission Path : PF motor pinion gear (CCW) → Spur gear 60 (PF roller & Paper eject roller) (CW)→

Spur gear 10.8 (CCW)

Combination gear 18.28 (CW) → Spur gear 27.2 (Pump unit gear) (CCW) ( * Above transmission pass = seen from the right side of the printer)

Figure 2-14. PF motor drive transmission path to the Pump unit

Operating Principles

Overview

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