JUKI MB-1373 - Adjusting the Nipper; Needle-to-Looper Relation

– 5 –
3-4. Adjusting the nipper
0.4 to 0.6 mm
1
2
1) Provide a 0.4 to 0.6 mm clearance
between nipper block
2
and n
ipper
1
to prevent the nipper
1
from hold-
i
ng the thread while the machine is in
operation.
2) Loosen screw
3
and move nipper bar
block
4
to the right or the left.
3-5. Adjusting the thread tension guide on the face plate
★
A
djust the needle-to-looper relation as follows :
1) Depress the pedal fully forward, turn the needle driving pulley in the normal sewing direction by hand to
bring down the needle bar to the lowest position of its stroke and loosen screw
1
.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
3-6. Needle-to-looper relation
If the formation of seams at the start of sewing is
failed and the seams are formed on the way even
when the thread pull-off lever is adjusted, turn thumb
nut
1
(double nut) to decrease the thread tens
ion.
1
2
2
3
A
B
C
5
4
6
2
TQx1
TQx7
4
3
(Adjusting the needle bar height)
2) Adjust the height of the needle bar using the top
two lines engraved on the needle bar
2
for the
TQx1 needle and us
ing the bottom two lines for
the TQx7 needle. Align the upper line
A
w
ith the
bottom end face of needle bar bushing (lower)
3
and tighten screw
1
. At this time, tighten the
screw so that groove
C
of the needle faces the
front.
(Looper position)
3
) Loosen screws
4
and turn by hand the needle driv-
in
g pulley until lower line
B
of two lines aligns with
the bottom end face of needle bar bushing (lower)
3
.
4) By keeping the machine in this state, align looper blade
5
with the center of the needle and tighten screws
4
.
5) Loosen screws
6
and prov
ide a 0.01 to 0.1 mm
clearance between the looper and the needle.
Ti
ghten screws
6
.
1