−2 −
(1) Height of the needle bar
The upper engraved line should be aligned with the bottom of lower bushing 3 when the needle bar is
at its lowest position.
Standard needle for MB-373 : TQ x 7
Standard needle for MB-377 : TQ x 1
2. STANDARD ADJUSTMENT
(2) Positioning the needle and the looper
1) Looper timing
When the needle bar is ascending from its lowest
position and the lower engraved line on the needle
bar is aligned with the bottom of the lower bushing,
the looper’s blade point should coincide with the
center of the needle. (When the needle bar is
ascending.)
2) Clearance between the needle and looper
The clearance is 0.01 to 0.1 mm when the looper’s
blade point coincides with the center of the needle.
3) Clearance between the needle guide and needle
The clearance between needle guide 6 and
needle is 0 to 0.1 mm when the needle bar is at its
lowest position.
Standard Adjustment
For TQ x 1
For TQ x 7
Engraved line
Height of the needle bar
Looper timing
Lower bushing
Engraved line
Clearance between needle and looper
0.01 to 0.1 mm
Looper’s blade point
Looper’s blade
point coincides
with center of
needle.
Clearance between needle and looper
0 to 0.1 mm
3
6
8
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