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Adjustment procedures
Results of Improper adjustment
1. Remove the feed bracket, feed plate, and the throat plate. Make
adjustments with the screw
❶
.
(Caution) The right and left positions can also change during
"3.-(10) Hook adjustment". Position adjustment for
the shuttle upper spring
❷
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 dis-
placement, needle thread biting
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
❶
seems to be protruded or it has been replaced
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
❷
.
o
If the shuttle felt
❶
is protruded,
this will be turned into a rotary
load of the inner hook, causing a
sewing error.
o
If the shuttle felt
❶
is missing or
pushed in too much, this will re-
sult in hook lubrication decien-
cy, causing hook overheating
and wear.
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