Epson 440 User Manual download pdf (Page 46)

EPSON Stylus Color 440/640/740 Revision A

Chapter 2 Operating Principles 46

2.1.1.2 Printing Process

Following figures show the sectional drawings of normal state and

ejecting state of the printhead.

Normal State:

When the print signal is not output, PTZ also does not move in the

waiting state (normal state). (Refer to Figure 2-3.)

Ejecting State:

When the print signal is output from the C206 main-B/C255/C256/

C257 main board, IC (IR2C72C:Nozzle Selector) located on the

Print head unit latches the data once by 1-byte unit. Appropriate

PZT latched by nozzle selector is pushed into the cavity by applying

common voltage from the main board. By this operation, ink that is

stored in the cavity pops out from nozzles. (Refer to figure 2-4.)

Figure 2-3. Print Head Normal State

Figure 2-4. Print Head Ejecting State

Nozzle

Nozzle Plate

Cavity

PZT

Ink Course

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Epson 440 User Manual Page 46