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15. THE RELATIONSHIP BETWEEN THE NEEDLE AND THE LOOPER
(1) The relationship between the needle and the upper looper
(2) The relationship between the needle and the lower looper
3.7 to 3.9mm 3.7 to 3.9mm
1) When the lower looper moves to the
leftest point, the distance between the
looper tip and the center line of the
needle should be about 3.7 to 3.9 mm
(40H, 44H and 50H : 4.1 mm to 4.3
mm). For 2-needle model, the distance
is from the lower looper tip to the center
line of the left needle.
0.01 to 0.1mm
2) Adjust the distance
from the looper tip
to the scarf of the
needle to 0.01 mm
to 0.1 mm when the
lower looper moves
to the right toward
the center line of
the needle (for the
2-needle models,
the left needle is
used as the refer-
ence).
When the upper looper moves to
the leftmost point, the distance
from the looper tip to the center line
of the needle is 4.8 to 5.2 mm. For
2-needle model, the distance from
the looper tip to the center line of the
left needle is 5.4 to 5.7 mm.
4.8 to 5.2mm
5.4 to 5.7mm
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.
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