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9.3. CARRIAGE SPACING SECTION
.
.
.
Carriage movement is provided by
a
stepping motor
controlled
by the
_logic
boa~d. The
car~1age
motor
_1s
a
stepping motor which operates in
7.5
°
increments for
~ach
pulse received, moving
the carnage
1/
180 inch
to the left or right per pulse.
.
.
.
.
The Ribbon cassette holder is mounted on the
carnage and
the
align
scale 1s
attached with 2 screws.
9.3.1 Power Transmission Mechanism
.
.
.
R
I fon of the carriage motor
is
transmitted to the
carnage through
the pinion
gear
on the motor
s::~
.
uc~rriage middle gear
,
timing pulley
(R) (L) and the
timing belt.
(Fig
.
5)
9.3 .2 Home
sensor
.
.
f
h
·
·
·
The home sensor is used for
setting
the home pos1t10~ or t
e carnage spacing operat1~n.
The home
position
is
detected
when
the sensing wall
of
the
carnage
pushes the home
sensor. (Fig. 6)
TIMING PULLEY
(L)
/
CASSETTE
HOLDER
CARRIAGE
THERMAL HEAD ASSEMBLY
ALIGN SCALE
CORRECT
SHAFT
(Fig 5)
TIMING
BELT
CARRIAGE
SHAFT
PINION
GEAR
CARRIAGE
MOTOR
ASSEMBLY
TIMING
PULLEY (R)
(Fig 6)
CARRIAGE
SENSING
WALL
-
20
-
9.4. Paper Feed Section
9.4
.1 Power Transmission
Mechanism
Revolution of the platen feed motor is transmitted
to the
platen gear through
the platen
middle
gear.
(Fig
.
7)
9.4 .2
Friction Feed
Mechanism (Fig. 8)
The
friction
feed
mechanism consists of
the paper
release roller and
the paper release
roller holder
which apply pressure to
the platen
,
the
paper
release
spring which
gives
pressure to the roller and
roller
holder
,
the
paper release
shaft
,
the paper release
link
which turns
the
shaft
,
and
the
paper release
lever
which
guides the paper release link.
Pulling
on
the
paper release lever in
the direction of the
arrow (
v
)
causes
the paper
release shaft
to
rotate, forcing
the paper release
springs
downward
and allowing
the
rollers to move away from
the
pla-
ten.
9.4
.3 Paper Out Detector
(Fig
.
9)
During
continuous printing,
the paper
out sensor
detects the
end of
the paper
and
outputs
an electr ic
signal.
An interrupting
type
photo
sensor,
located in opposition to
the
platen
,
detects
the absence
of
paper
and
generates
the
"
END OF PAPER"
signal.
PLATEN FEED
MOTOR PINION
'---...
//
PLATEN
MIDDLE GEAR
(Fig 7)
PLATEN GEAR
JJ
t
1/
PAPER RELEASE
SHAFT
PAPER RELEASE
LINK
PAPER
OUT SENSOR
(F ig 9)
-21-
REAR
VIEW
PAPER RELEASE
ROLLER HOLDER
PAPER
RELEASE
SPRING
(F ig 8)
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