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1.2.3
Carriage Feeding Mechanism
1) Configuration
This mechanism consists mainly of the carriage motor,
tension unit, wire drum ass'v. wire, carriage unit, pulleys,
and guide shaft.
2) Remarks
The carriage is fed by the winding of the wire onto the
wire drum and is controlled by the direction and amount of
take-up. The amount of carriage feed is determined by
setting the outer diameter of the wire drum and related
parts so that the carriage is fed 0.2 mm per one step of the
motor.
Similar to the paper feeding
mechanism,
the speed-up/
down gear section of the wire drum assy is provided with
a two-gear configuration to prevent backlash during for-
ward or backward rotation of the carriage motor.
3) Operating Principle
The carriage has a built-in dot head and the bottom sur-
face of the carriage is in contact
with the guide
shaft.
Driving the carriage motor causes the wire drum assy to
take up the wire in the arrow direction shown in Fig. 1-5
so that the carriage
is
moved in the negative x-axis direc-
tion
(•).
To reverse
the carriage
movement
in the nega-
tive X-axis direction (¢:i),
the
motor is
rotated in
the oppo-
site direction.
Fig. 1-4. Paper Feeding Mechanism
Head
Paper holding roller
Paper feeding gear
Paper
guide
~Y(-)
Motor
Frame
Paper
Platen
(Paper
feeding claw)
Y(+)
3) Operating Principle
The peper is set so that it is caught between the platen
and the paper holding roller. At this
time,
driving the paper
feeding motor causes the platen unit coupled to the paper
feeding gear ass'v to rotate in the arrow direction (•)
shown in Fig.
1-4.
The paper is then fed in the positive
Y-
axis direction
tes)
by pressure from the paper holding
roller
and being caught on the paper feeding claw.
To reverse-feed the paper in the negative Y-axis direction
(¢:i),
the motor is rotated in the opposite direction.
Since
the paper is normally in a released position, it can be pulled
manually forward or backward in the standby
mode.
-
CE-140P
Fig.
1-3.
Two-Body
Confi
g uration
of Paper Feeding
Gear
Spring
M~
+
.
Paper
feeding gear
1.2.2
Paper
Feeding Mechanism
1) Configurat
ion
This mechanism consists mainly of
the
paper feeding mo-
tor,
paper feeding gear ass'v,
platen unit, paper holding
lever, paper holding roller,
and
paper
g~ide.
2) Remarks
Paper feed
is performed by friction between the paper
holding roller and platen unit (i.e., contact between the
paper and the paper feeding claw).
The amount of paper feed is determined by setting the
outer diameter of the platen and related parts so that pap-
er is fed 0.2 mm per one step of the
motor.
To prevent
backlash at such time (during forward or backward rota-
tion of the motor), the paper feeding gear is provided with
a two-gear configuration as shown in
Fig.
1-3.
The paper feeding claw functions to prevent slippage of
the paper while it is being fed forward or
backward.
Fig.
1-2.
Orientation of Paper
and
Carriage
Carriage
1.2.1 Plotting Principle
As shown in Fig. 1-2, the
vertical
direction of the paper is
regarded as the Y-axis
direction,
and its horizontal
direc-
tion as the X-axis direction. Paper is fed by the paper
feed-
ing mechanism of Model-3740
along the Y-axis direc-
tion; the built-in dot head of the carriage is moved by the
carriage feeding mechanism
along the X-axis
direction.
These two types of movements plus the wire control of
the dot head on the carriage enable plotting and printing to
be
performed.
1.2 OPERATING PRINCIPLES
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