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4.
MOTOR AND GEAR TRAIN ASSEMBLY
4.1
The motor and gear t r a i n assembly drives the f o l l o w i n g :
(a)
belt assembly, which produces the printout image,
(b)
paper feed r o l l e r , which moves the paper upwards as p r i n t i n g
proceeds,
(c)
encoding disc, which f u n c t i o n s in c o n j u n c t i o n with the control
electronics p.c.board to provide the printout
styl f on the belt assembly.
4.2
The
h o r i z o n t a l l y
v e r t i c a l l y mounted
assembly.
w h i c h , in turn, drives the paper feed roller assembly.
end of the p u l l e y and wormshaft, a spur gear drives the encoder disc,
both items being mounted within the underside of the base frame.
5.
CONTROL ELECTRONICS BOARD
5.1
The control electronics board
the base
LED/photodiode c o m b i n a t i o n , the board provides s i g n a l s to drive the
motor
and
the double-sided edge-connector by a short loom;
of the loom is clamped between the top cover and the base frame when
the cover is secured to the base.
6.
BASE FRAME ASSEMBLY
6.1
The base frame assembly comprises the base frame and the base frame
insert, both of which are p l a s t i c m o u l d i n g s .
a chassis on which most components are mounted; the base frame insert
is
a removable section which fits into the underside of the base
frame.
drive and idler p u l l e y s , as well as the mounting for the LED.
secured to the base frame by two of the four screws w h i c h retain the
top cover, and by two shorter screws (see Figure 3).
7.
PAPER REEL CARRIER ASSEMBLY
7.1
The paper reel carrier assembly consists of a plasitc moulding which
houses the reel of electro-sinsitive paper, and a spring-loaded pinch
roller.
spigotted end-caps which are inserted into the ends of the tube at the
centre of the reel ; these end-caps should be transferred to the new
reel when the reel is changed.
the
paper
'grip' necessary to enable the paper to be fed through the printer.
The complete assembly slides
place;
it
PRESS HERE on the underside of the carrier.
mounted
p u l l e y
This wormshaft drives a h o r i z o n t a l l y mounted wormshaft
frame.
In conjunction with the encoding disc and the
the
p r i n t i n g
The insert contains the lower bushes for the shafts of the
The
paper
is supported
into contact with
is released by pressure being
motor
drives,
via
and
wormshaft
which
is
mounted on
system.
The p.c. board is connected to
in the carrier on two
The spring-loaded pinch roller forces
the
paper feed
into the base frame,
applied to the point marked
2.2
signals to the
bevel
gearing,
rotates
the
At the lower
the upper surface of
the p.c. board-end
The base frame provides
plastic
roller to
provide the
and clips
the
belt
It is
into
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