– 15 –
Adjustment procedures
Results of Improper adjustment
1. Loosen setscrews
❹
in spreader thread guide
❷
and adjust
the position of spreader thread guide
❷
. (Spreader thread
take-up
❶
is fixed to rocking thread take-up
❺
and can not be
adjusted in the height direction.)
2. After the adjustment, turn the sewing machine by hand and
check whether spreader thread take-up
❶
comes in contact
with spreader thread guide
❷
, or section
A
of clearance is too
small.
3. Adjusting procedure of the clearance
(1) Loosen setscrews
❹
in spreader thread guide
❷
and adjust
in the lateral direction, or loosen setscrews
❸
in the rocking
thread take-up and move spreader thread take-up
❶
to the
right or left to adjust the clearance.
(Caution) When loosening setscrews
❸
in the rocking thread
take-up and adjusting the position of spreader thread
take-up
❶
, adjust so that length of rocking thread
take-up
❺
(83 mm) does not change.
◦ When the relation of position
between spreader thread take-
up
❶
and the spreader thread
guide
❷
is not proper, sewing
troubles such as stitch skipping
and the like will be caused.
◦ If thread is less stretched and
slackness of thread occurs at
the thread take-up section when
spreader thread take-up
❶
is in
its highest position, the spreader
fails to pick up thread and stitch
skipping occurs.
◦ If stretch or feeding of thread is
excessive when spreader thread
take-up
❶
is in its highest posi-
tion, not only thread on the seam
side is drawn and needle thread
can not be tightened, but also
needle bend or needle breakage
will be caused.
◦ If stretch or feeding of thread is
excessive when spreader thread
take-up
❶
is in its lowest po-
sition, thread slacks when the
spreader moves from left to right
and stitch skipping occurs.
