Overview and Operating Principle 1-9
Figure 1-8 Operation of Print Head
Print solenoids drive timing
For printing, print solenoids A, D and G are energized with drive pulse Pn which has the pulse
width of Timing signal Tn to Tn+1. Next, print solenoids B, E and H are energized with drive
pulse Pn+1 which has a pulse width equal to Timing signal Tn+1 to Tn+2. In the same way,
a
b
Paper feeding platen unit
Lever, printing, head
Push, bar head
Plunger, head
Iron core, head
Printing lever shaft
Printing, lever spring
Coil, head
Model M190G Technical Manual
1.
When power is supplied to the Coil,head, the plunger,head which is mounted to the Push,bar
head is pulled toward the Iron core,head in the direction of arrow (a) to press against the back
of the Lever,printing,head.
2.A
s the base of the Lever,printing,head is supported by the printing lever shaft, when the back
of the Lever,printing,head is pressed, the top end of the print lever is pushed out toward the
paper feeding platen unit in the direction of arrow (b) centering on the print lever shaft. (This
position is indicated by a broken line in the Fig. below.)
3.
Then the Lever,printing,head hits against the paper feeding platen unit on the paper to print 1
dot.
4.
When the Coil,head has been energized, the Lever,printing,head and the plunger,head return
to the home position under the spring force of the print lever spring and sets to the standby
state (the position indicated by the solid line in the Fig. below.)
