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Adjustment procedures
Results of Improper adjustment
1. Remove the feed bracket, feed plate, and the needle plate.
Make adjustments with the screw
1
.
(Caution) The right and left positions can also change during
"(11) Hook adjustment." Position adjustment for the
shuttle upper spring
2
should be done after the
completion of standard hook adjustment, without
fail.
o
If there is a front and rear dis-
placement or a right and left
displacement, needle thread bit-
ing may occur into the hook. Too
much motion to the rear side will
cause the moving knife to fail to
hook the needle thread.
o
Too much motion to the rear side
will cause the moving knife to fail
to hook the needle thread.
o
Too much motion to the left side
will cause the moving knife to fail
to hook the bobbin thread.
Adjustment procedures
Results of Improper adjustment
1. If the shuttle felt
1
seems to be protruded or it has been re-
placed with a new one, push it in by means of tweezers or the
like.
(Caution) Do not push it in excessively. Align the height and
the plane of the shuttle race
2
.
o
If the shuttle felt
1
is protruded,
this will be turned into a rotary
load of the inner hook, causing a
sewing error.
o
If the shuttle felt
1
is missing
or pushed in too much, this will
result in hook lubrication de-
ciency, causing hook overheat-
ing and wear.
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