Adjustment Procedure
2) 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 direction
A
), to shorten the thread length remaining on the
needle after thread trimming or counterclockwise (in direction
B
), to lengthen the thread length.
3) Length of needle thread remaining at the needle
The needle thread length C dimensions of the S type and H type is 35 to 45mm.
* So-called "bird's nest phenomenon" is reduced by shortening the length of needle thread remain-
ing 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 presser operation : Reduce (Factory-adjusted to 300 sti/min at the time
of shipment)
• U293 Sewing speed resetting angle when the thread presser operates (340 degrees preset at the time
of factory shipment)
Enlarge the U286 speed range.
No.
Item
Setting range
Factory-
adjusted
Unit
U286
Sewing speed during thread presser operation
This memory switch is used for setting the speed to be em-
ployed when the thread presser operates.
100 to 3000
300
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
340
Degree
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