JUKI AMS-221EN Series Engineer's Manual page 71

Adjustment Procedures
1. Remove the work feed bar, feed plate, and the throat plate. Adjust
the positioning of shuttle upper spring
pcs.).
2. Using the setscrew
lower thread holder
(Caution) The right and left positions can also change during (18)
hook adjustments. Position adjustment for the shuttle
upper spring
standard hook adjustment, without fail.
Adjustment Procedures
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
(Caution) When the holes of the shuttle race
thread chips and material chips, wrong recognition for
the shuttle felt
others so that the shuttle felt
Clogging by thread chips and others can be a cause of
insufficient lubrication or wear.
with the setscrews
, adjust the amount of overlapping D for the
and the shuttle upper spring
should be done after the completion of
.
has been mounted assuredly.
may occur. Remove thread chips and
can be set correctly.
o If there is a front and rear
(2
.
o Too much motion to the rear side
o Too much motion to the left side
o If the shuttle felt
o If the shuttle felt
are clogged by
o If the shuttle packing
– 67 –
Results of Improper Adjustment
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.
will cause the moving knife to fail
to hook the needle thread.
will cause the moving knife to fail
to hook the bobbin thread.
Results of Improper Adjustment
is protruded,
this will be turned into a rotary load
of the inner hook, causing a
sewing error.
is missing or
pushed in too much, this will re-
sult in hook lubrication deficiency,
causing hook overheating and
wear.
missing, the shuttle felt
others may be lost, and this can
be a cause of shuttle heating and
wear.
has been
and