5. Adjusting/Elf H
The looper movernent of this rnaqh.i&e tr-as hee(r qrcge(L\
adjusted before shiprnent from the factory, but if it needs
re-adjustment when it is disassembled for repair or etc,
prcceed as foilows.
1. Thread Tension (figure 3)
Thread tension is most important for successful sewing,
Maiadjustment results in thread break, skipping stitches and
break ofbag.
Proper thread tension may slightly vary with the type of bag
and thread. The norm is given below. Thread tension
regulators are mounted so that the tension is uniform for
stitch length. To adjust the tightness of seam, adjust O,@
in Figure 3:*
1) Heavy material fiute,etc.)
Thread tension regulators O should be loosened slightly
(turn the adjust nut counterclockwise), Needle thread
controller @ after loosening set screw.
2) Lisht material
Tighten thread tension regulators O (turn the adjust nut
clockwise).
3) Needle thread
At the shipment, the needle thread controller @ for
Creped Paper Tape is adjusted a iittle downward. In case
of using sewing machine without Creped paper Tape, the
needle thread controller @ should be re-adjusted
upward.
The feed rate of thread must be adjusted according to
stitch leneth and thickness of bag. If thread tension
regulator adjustment is not sufficient for obtaining the
required thread tightness, use needle thread controller @
by moving it up or down as necessary, after loosening set
screw. Thread is tighter by moving it up (in the direction
of the arrow), and is looser by moving it down. Tighten the
set screw after adjustment.
4) Looper thread
Looper thread tension regulator @ should be adjusted in
accordance with adjustment of the needle thread tension =
regulator. Adjust it so that the looper thread will not sag.lf
looper thread tension is too much, the needle thread may
break.
2- Presser Foot Pressure
Presser foot pressure must be adjusted according to the
material of bag and thickness. Check the reverse side o{
searns. The pressure is too strong if seams show a sign of
scratches by feed dog teeth, or the actual stitch length is
shorter than the preset feed rate of feed dog teeth. In this
case, unscrew plate spring adjust screw(102171),Figure 4,
after loosening nut (5/16N24301). Be sure to tighten the nut
after the adjustment. If the pressure is too weak, seams do
not form a straight line, or the stiteh length is irregular. In
this case, increase the pressure by screwing the plate spring
adjust screw. Decrease the pressure when closing jute and
other heavy bag material, and increase it when closing pp
woven cloth and other light bag material. your machine is
adjusted for 3-ply kraft paper bags at the factory.
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