1. Remove the work feed bar, feed plate, and the throat plate. Adjust
the positioning of shuttle upper spring
with the set screws
(2
pcs.).
2. Using the set screw
, adjust the amount of overlapping D for the
lower thread holder
and the shuttle upper spring
.
(Caution) The right and left positions can also change during (15)
hook adjustments. Position adjustment for the shuttle
upper spring
should be done after the completion of
standard hook adjustment, without fail.
o If there is a front and rear
displacement or a right and left
displacement, 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.
1. If the shuttle felt
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
.
2. Confirm that the shuttle packing
has been mounted assuredly.
o If the shuttle felt
is protruded,
this will be turned into a rotary load
of the inner hook, causing a
sewing error.
o If the shuttle felt
is missing or
pushed in too much, this will re-
sult in hook lubrication deficiency,
causing hook overheating and
wear.
o If the shuttle packing
has been
missing, the shuttle felt
and
others may be lost, and this can
be a cause of shuttle heating and
wear.
– 58 –
Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment
