Bedienungsanleitung Epson LX300 (Seite 38 von 107) (Englisch)

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Operating Principles

LX-300 Service Manual

2.1.5 Ribbon Shift Mechanism

This printer can be equipped with a color upgrade kit to print in color. The printer performs

color

printing unidirectionally. The option is composed of the

color

ribbon

shift mechanism. The

Color

ribbon feed mechanism is shared in common

with

black

ribbon

feed

mechanism,

and the shift

mechanism shifts the ribbon cartridge up and down.

Table 2-2 shows the CS motor assembly specifications.

The motor control system is open-loop, so

that when the color is being changed, the positioning is controlled by stepping pulse.

Table 2-4. CS Motor Assembly Specifications

Category

Requirement

Type

4-phase, 48-pole, PM-type stepping motor

Drive Voltage

35 VDC

10Yo

Coil Resistance

150 ohms

5Y0

(per phase, at 25° C or 77°

Drive Pulse Frequency

Color shift 500 pps

Excitation Method

Constant-vottage 2-2 phase excitation

The

ribbon shift mechanism consists of the color ribbon and color upgrade kit. The color upgrade

kit is composed of the

motor assembly,

ribbcm

shift gear/cam, motor driver

IC,

and color ribbon

sensor. The l-inch-wide color

ribbon

is separated into four equal-width bands of different colors.

The ribbon shift mechanism shifts the ribbon cartridge up and down.

When the color ribbon cartridge is loaded, it is possible to print in up to seven colors. One of the

four colors on the ribbon is selected by the color ribbon cartridge motion, which inserts a portion of

the plastic posts into the slots in the printer mechanism as a fulcrum.

Figure 2-9 illustrates the color

shift mechanism. The mechanism shifts the ribbon cartridge by converting the gear rotation to

liner motion (up and down) of the color ribbon cartridge, using color shift cam gear.

Any color band can be selected

by’

rotation of the

motor assembly, using the color home

position (the position of the black color band) as a starting point and reference position. Home

position is recognized by the

motor assembly stepping pulse. When printer is power on, the

motor assembly is exated at any phase position at first. Next, the

motor assembly is turned for

235 steps ( black

yellow). Then, the motor returns one step (yellow+ black), and the ‘motor is

stopped. Finally, the motor returns 223 steps

(yellow+

black) and stops. This position is home

position.

Table 2-5 gives coloring sequences.

For halftones, as shown in the table, a color is created by

printing one color on top of another.

Table 2-5. Coloring Sequences

Print Ribbon

Print Color

First Printing

Seoond

Printing

Black

—

Magenta

—

Cyan

cyan

—

Yellow

—

Green

Yellow

cyan

Orange

Yellow

Magenta

Violet

Magenta

Cyan

Note:

The printer prints the brighter color first to prevent the ribbon from

stained

f-’””

,,.

2-8

Rev.A

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