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9 EXPLANATION OF MECHANISM
9.1. Printing Section
9.1.1
Print Head
• Printing mechanism is composed of;
• Head press solenoid
• Head press plate which is linked to the solenoid and the head press
cover
• Head press lever which transforms the slide movement of the head pres
s
plate to rotational move-
ment at
the
fulcrum of the carriage shaft
.
• Head press arm which transmits rotating movement
to the head holder
• Head holder assembly which the thermal head is attached
.
• As shown in the figure
(Fig.
1 ), the head press solenoid engages the thermal head
.
In this condition,
printing is performed by movement of the carriage (Thermal Head)
9.1.2
Correction
• Correction of a printed character is performed by the lower of the two
cartridges
(correction tape car-
tridge)
.
That is, the correction tape is lifted to the position of thermal head. In the character which is
to be corrected will be covered with white ink twice. (Fig
.
2)
• Correction mechanism is composed of; (Fig
.
3)
• Correction motor with correction worm gear
• Correction shaft with correction worm
wheel
• Lift cam
• The rotating movement is transformed to slide movement
(up-down)
by the worm gear and the Lift
cam.
HEAD PRESS PLATE
---
HEAD PRESS SOLENOID
~
HEAD PRESS-
LEVER PIN
ttt_
/
THERMAL HEAD ASSEMBLY
fl.
HEAD HOLDER ASSEMBLY
11\ir
LEVER
--
HEAD PRESS
··1··
"
f
HEAD PRESS ARM
CARRIAGE
(Fig 1)
PRINT RIBBON
THERMAL
HEAD
.--.--~
~a
~
:-/
------
--
---
---~.-
.
---
~
_ THERMAL
HEAD
CORRECTION TAPE
LIFT
C
CORRECTION
,Jr,r--<.Q
Down (printing)
CASSETTE HOLDER ASSEMBLY
CARRIAGE SHAFT
!
.
CORRECTION
MOTOR
SHAFT
(l)
J
(Fig 3)
ASSEMBLY
-
18-
Up (Correction)
(Fig 2 )
(
C
9.2
Ribbon Feed
Section
•
Winding
of
ribbon is controlled by the mechanism inside the carriage as shown
in
Fig
.
4. That
is,
when print-
ing
,
the ribbon is
wound
continuously and when not printing, the ribbon is wound intermittently
.
Winding Mechanism
1)
When Printing
When printing
,
the head holder assembly
®
moves toward the platen because the head press solenoid
is energized. The ribbon select arm
@
(which presses against the head holder assembly
®
) also moves
towards the platen because of the ribbon select arm
spring
©
.
This causes the ribbon idle gear
®
to
engage
in the ribbon pulley
@
.
Since the ribbon pulley
@
is rotated by the timing belt during carriage
movement, rotating power is transmitted from
@
-®-
®
-
>@(ribbon winding assembly) and ribbon is
wound
continuously.
2) When Not Printing
When not printing
,
the head holder assembly
®
is held away from the platen by the head holder spring
®
.
Because of this, the ribbon idle gear
®
is not engaged
in
the ribbon pulley
@
so continuous rotating
power is not transmitted by the timing belt to the ribbon winding assembly
®
.
At this time the ribbon is
wound intermittently by the follow ing means. The intermittent winding cam
CD
is rotated by the timing belt.
This
cam
drives the intermittent winding lever
Q)
,
which drives the ribbon winding gear assembly
®
by
means of the intermittent winding nail
®
.
BACKWARD
FORWARD
@
HEAD HOLDER
@
RIBBON SELECT
CD
INTERMITT
WINDING C
I
TIMING BELT
@
INTERMITTENT
WINDING NAIL
Q)
INTERMITTENT
WINDING LEVER
SPRING
ARM
THERMAL HEAD ASSEMBLY
0
®
RIBBON IDLE
GEAR B
@
RIBBON WINDING
GEAR ASS EMBLY
(Fig
4)
TOP
VIEW WITHOUT
CARRIAGE
COVER
-19-
@
HEAD HOLDER ASSEMBLY
@
RIBBON
PULLEY
@
RIBBON SELECT
ARM SPRING
®
RIBBON IDLE
GEAR A
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