Printhead Printing Operation - Epson LX-1050+ Service Manual

Operating Principles

2.2.1 Printhead Printing Operation

The dot-wire operation during printing is as follows. When the head-driving coil for a dot wire is
energized, the actuating plate, which is engaged to one end of the dot wire, is attracted to the iron
core, and drives the dot wire toward the platen. The dot wire forcefully pushes both ribbon and
paper against the platen, causing a dot to be printed.
When the head-driving coil is deenergized, the actuating plate spring causes the actuating plate to
return to its initial position. After striking the platen, the dot wire also returns to its initial position,
partly in response to the impact energy, and partly as a result of the wire-resetting spring. The dot
wire then remains engaged to the actuating plate until it is driven again.
9 solenoids
Solenoids:
0.29 mm
Wire Diameter:
Drive Voltage: 24 VDC * 10Yo
Coil Resistance: 19.2 ~ 1.0 fi2 at 25° C
Dot
Wire Resetting Spring
\
Actuating Plate ~
Figure 2-2. Printhead Printing Operation
2-2
Wire
\
/
Ribbon
Paper
Platen
Rev. A