Carriage Mechanism - Epson 440 Service Manual

2.1.1.2

Carriage Mechanism

Carriage mechanism is to drive the carriage with print head mounted from left to right or vice versa.
The carriage drive motor in this printer is a 4-phase, 200-pole, stepping motor and is driven by
1-2phase, 2-2phase and W1-2phase drive method. This stepping motor allows the carriage to
move freely to the particular positions which is necessary for various operation, such as paper feeding,
ink absorbing, flashing, ink exchange and cleaning operations. The tables below shows carriage motor
specifications and motor controls at each mode.
Motor type
Drive voltage Range
Internal coil resistance
Driving speed(frequency) range[csp(pps)]
Control method
Mode
High speed skip
Printing(Normal)
Printing(SLQ)
Capping
Wiping
Cap(valve release)
Withdrawal of cap
*Note 1): The reason why plural drive methods exist is that following some sequences described below
exist in the each mode and stable carriage operation and printing are performed individually
by different drive methods. This drive method is especially necessary for high speed skip.
• Acceleration 1 mode •¨ • Acceleration 2 mode •¨ • Deceleration 1 mode •¨ • Deceleration 2 mode
Figure 2-7.CR(PF/Pump) Motor Internal Block Diagram
Rev. A
Table 2-2. Carriage Motor Specification
Item
Table 2-3. Motor Control at Each Mode
Driving speed
[CSP]
340
200
100
80
40
20
5
Description
4-phase/200-pole Stepping motor
42VDC •} 5%
7.8 ohms•}10%(per phase under
25••environment)
5(60)•`340(4080)
Bi-Pola Drive
Drive
frequency
[PPS]
4080
2400
1200
960
480
240
60
Chapter2 Operating Principles
Drive method
W1-2, 2-2,1-2phase
drive*
W1-2phase drive
W1-2phase drive
W1-2phase drive
W1-2phase drive
W1-2phase drive
W1-2phase drive
2-7