15.
POSITION
OF
THE
NEEDLE
GUARD
(Fig. 16)
Adjustment should be made so
that
when the needle
bar
is
at
the
lowest position, the clearance between the needle and the needle guard
@ comes to 0.05~0.1 mm by looseming the screw
(u)
and moving the needle
guard
(g) to
right
or
left.
16.
TIMING
THE
NIPPER
RELEASING
PLUNGER
OF
TENSION
DISC NO. 2 (Fig. 17)
Screw
Driver
Fig.
17
(Note:
This
is a very delicate technical adjustment, so be extremely
careful)
The
standard
motion is, as shown in Fig. 17, to
rotate
the needle
driving pulley toward the arrow direction as you pull the thread
and
the tension disc No. 2 will float up
and
the thread will be slipped
out
quickly.
At this instant, the
height
from the needle
bar
upper
bushing surface
to the top edge of the needle bar is
54'>'57
m/m (2-7/64'-2-3/16").
When
defective signs, as shown below, occur too frequently, try the
following
adjustments:
Insert
a screw
driver
into
the
tension
post
No. 2, as
shown
in Fig.
17, loosen
nut
(D
and
rotate the tension post toward the arrow direction.
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14
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