−13 −
Adjustment Procedures Results of Improper Adjustment
™ Excessive return of the lower
looper tends to cause stitch
skipping when filament thread is
used.
™ Insufficient return of the lower
looper tends to cause needle
thread stitch skipping when
spun thread is used.
™ Excessive clearance will often
cause needle thread stitch
skipping.
™ Insufficient clearance will cause
needle breakage due to the
contact of the looper with the
needle, or produce scratches on
the blade point of the looper,
leading to needle thread
breakage or other troubles.
1) Returning amount of the lower looper
1 Loosen setscrew 2 of lower looper support arm 1 and adjust
lower looper 4 to make adjustment of the returning amount.
(Referential information)
1. Radius K of lower looper 4 will be 66.9 mm when the lower
looper is inserted into lower looper support arm 1 until it
contacts with stopper pin 3 and then is fixed.
2. The rocking angle of the lower looper will be 26˚.
(MO-6 S, R)
The rocking angle of the lower looper will be 32˚.
(MO-69 G, J)
2) Clearance between the lower looper and the needle
MO-6700S Series
1 Loosen setscrew 2 of lower looper support arm 1 to the extent
that it is temporarily tightened. Now, make the adjustment by
moving lower looper support arm 1 back and forth.
MO-6900S, R, G, J Series.
1 Loosen setscrew 2 of lower looper support arm 1 to the extent
that it is temporarily tightened. Then finely adjust the longitudinal
position of the looper using fine adjustment screw 5.
2 Turn fine adjustment screw 5 clockwise to move lower looper
4 away from the needle.
Turn the screw counterclockwise to move lower looper 4 closer
to it.
To Next Page
Loading...
