Power Transmission Mechanism; Printhead Pin Operation; Paper Feed Mechanism Eames Ek Gs - Panasonic KX-P1180 Service Manual

Motor
Pinion Gear
Clutch Gear
i Felt
al
!
Tractor Gear
| Pin Guide
'2. Head
ll
Pin
Head Yoke
Return Spring
| Armature
Stopper
Tractor Gear
Paper Feed Selector
Scissors Gear
Idle Gear
Tractor Drive Shaft
KX-P1180
6.3 Printhead
The printhead utilizes 9 electromagnets as a driving
source, which causes the pins to strike through the
ink ribbon against the platen onto the typing paper
for matrix printing. The construction of the printhead
is shown at left.
6.3.1 Power Transmission Mechanism
The set of 9 electromagnets consists of a one piece
yoke and 9 coils. The armature which secures the
pins is supported by this yoke.
6.3.2 Printhead Pin Operation
When 4 coil assembly is excited by a print signal, the
armature is drawn In, and the pin secured by the ar-
mature Is guided by the various guides to move in
the direction of the platen. The pin strikes through
the ribbontothe paper. Next, the return spring moves
the armature and pin from the platen back to the rest
position.
6.4 Paper Feed Mechanism
A DC pulse motor is used for paper feed. Both con-
tinuous paper and single sheet can be fed by operat-
ing the paper feed selector. Continuous paper is
loaded on both the left and right sides of the pindrum
of the tractor drive device. Continuous paper is fed
from the bottom or rear of the printer. Single sheet
paper is fed from upper slot on top of the printer.
The paper feed mechanism is shown below.
6.4.1 Power Transmission Mechanism
Rotation is transmitted from the pulse motor to the
platen gear and tractor gear via the idle and scissors
gears. The tractor gear consists of a drive gear and
clutch mechanism which functions when operating
the paper feed selector. The selector lever pushes
end of the tractor shaft to disengage the tractor drive
device from the tractor gear, and then releases the
spring loaded friction rollers by rotating the cam shaft
to apply the gripping force for single paper feed.
The tractor drive mechanism consists of'a pin drum
with a spring loaded a paper hold cover and its drive
shaft to feed continuous paper.
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