9. Standard adjutsments
9-3. Adjusting the needle clearance
I
0.01
-
O.OBmm
Turn the machine pulley
to
align the tip of the rotary hook with the needle center line. Then loosen the set screw 0
and
turn the eccentric shaft 8 to adjust so that the clearance between the needle
and
the rotary hook is
0.01
- 0.08
mm.
9-4. Adjusting the driver needle gurard
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw 8
and
turn the eccentric shaft 8 to adjust
so
that the driver needle guard 0 contacts the needle. If the needle contact
pressure
is
too great, skipped stitches may occur.
On
the other hand,
if
the driver needle guard 0 is not touching the
needle, the tip of the inner rotary hook will obstruct the needle, resulting
in
an
excessively high amount of friction.
9-5. Adjusting the shuttle race thread guide
I
$
I
The needle groove of the shuttle race thread guide 0 should
be
aligned with the center of the needle plate hole, and
the needle center and the angled sec:tion@ should
be
aligned.
NOTE
If the shuttle race thread guide
is
in
the wrong position, thread breakages, soiled thread
or
catching of the
thread may occur.
BAS-341 E • 342E
33
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