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4-12-1. Printing Mechanism Block
The printing mechanism block consists ol the thermal hand unit,
platen unit, pressure contact spring and carnage guide plate
units
Plewn unit
4-12-3. Tape Winding Mechanism Block
The tape winding mechanism block constats o( winding bobbin
unit, winding gear A winding gear B. winding gosr C. wnding
gear spring and a rack section positioned m the front o' paper
guide A In the printing state (head is pressure-contacted with
ptaian),
the winding gear A
0
is engaged to the tack
positioned in front of poparguide A end when the carriago shifts
to the tight, that is, the column is raised, the winding gear A ©
rotates. The rotation is transmitted to winding gear 8 (?) —
Minding
gear C
(3)
— winding gear
B 0
and to winding
bobbin unit ©. When winding bobbin unit 0
«H»t.«, the
Minding bobbin of the cassette which coincides with it rotates
and the tape within the cassette unit •* wound Moreover,
winding gear A 0 s eo structured as to enable shifting within a
ceitain range with gear 0 0 as th. core, and >» pressed against
the rack side with the winding gear spring. This is due to the
prevention of gesr teeth from being damaged when wind't-g gear
A 0 is ongagod to tho rack, and even when the trp of th« teeth
collide, the winding gear A 0 tuns off.
The head unit is pressure-contacted to the platan unit Side by
the pressure contact spring At this time, with the fulcrum which
supports tho platen unit as the core, the platan unit freely rOtStO*
mthin a certain range to forcibly be pressured against the head
surface during head pressure eontnet. and enables the platen
surfaces to uniformly face each other without any space In
between. Then the power is applied to 1h» thermal head through
FPC and printing is performed by the generation Of heat.
4-12-2. Column Raising Mechanism Block
The column raising mechanism block consists of a wire unit,
carriage guide plate unit carriage shaft and a winding bobbin
shaft unit to which tho bead unit is installed, wire spring, and
pulley installing pedestal unit
— Minimum shifting pitch —
The deceleration ratio between the stepping motor ond wire unit
K set at I : 2.64. and at 1 pulse |3.75T of slopping motor, tho
shift of the bobbin shaft unit or head unit is 0.14 ■ nir In this
case, power transmission from the wire unit to winding bobbin
8
ho ft unit is conducted by wire and the wire station is served by
the wire spring. In addition, the guide when the winding bobbin
unit shifts is carried Out by 2 csrnags shafts which contact and
slide to tha carriage guide plate unit
Also, in order to maintain « constant amount ol tape winding, a
slip mochanism is installed within the winding bobbin unit
As can he seen in the above diagram, winding gear 0 and
winding gear B are engaged and winding gear D teeth ere
pressed down with a spring to the wiroing bobbin pulley with fs*t
Due to this fnebon resistance, the rotation of winding gear D is
transmitted to winding Bobbin pulley and thereby rotates the
winding bobbin unit. When the load applied to the winding
bobbin uni: becomes ovet a f>»ed value, the winding bobbin
pulley and winding gear 0 ere caused to Slip.
4-8
PRN-T241AE)
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