– 85 –
[Adjusting the remaining length of needle thread]
Adjust the length of needle thread remaining at the
needle to 35 to 45 mm (for both the S and H types)
by turning thread tension No. 1 nut
②
.
1) Turn thread tension No. 1 nut
②
clockwise (in direc-
tion
A
), to shorten the thread length remaining on
the needle after thread trimming or counterclockwise
(in direction
B
), to lengthen the thread length.
[To reduce bird's nest (thread tangling) at the beginning of sewing]
In addition to the aforementioned adjustment, so-called "bird's nest phenomenon" is reduced by increasing
the pitch of the first stitch at the beginning of sewing.
So-called "bird's nest phenomenon" is
reduced by shortening the length of needle
thread remaining at the needle. In this case,
however, the needle thread is likely to slip
off the needle eyelet. To reduce slip-off
of the needle thread, sewing speed at the
beginning of sewing should be reduced.
"Memory switch"
•
U286 Sewing speed during thread press
-
er operation : Reduce (Factory-adjusted
to 300 sti/min at the time of shipment)
• U293 Sewing speed resetting angle
when the thread presser operates : Re
-
tard (Factory-adjusted to 340 degrees
at the time of shipment)
With respect to the memory switch
settings, a sewing speed of 250 sti/min is
recommended for "U286 Sewing speed
during thread presser operation", and an
angle of 720 degrees is recommended
for "U293 Sewing speed resetting angle
when the thread presser operates".
A
B
②
35 to 45 mm
Custom condensation (CC)
or
A>B
A>B
A : Stitch pitch of the first stitch
B : Normal stitch pitch
A
B
A
B
Condensation
No.
Item
Setting range
Unit
U286
Sewing speed during thread presser operation
This memory switch is used for setting the speed to be employed when the
thread presser operates.
100 to 3000
sti/min
U293
Sewing speed resetting angle when the thread presser operates
This memory switch is used for setting the angle at which the sewing speed
employed when the thread presser operates is reset.
* The setting is enabled when the thread presser operates.
0 to 720
Degree
Condensation
