JUKI DDL-8000A Instruction Manual page 57

[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 ① .
1) Turn thread tension No. 1 nut ① clockwise (in
B
A direction A), to shorten the thread length re-
maining on the needle after thread trimming or
①
counterclockwise (in direction B), to lengthen the
thread length.
– 54 –
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 re-
duce slip-off of the needle thread, sew-
ing speed at the beginning of sewing
should be reduced.