Upper Thread Adjustment - Garudan GF-105 Series User Manual

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9. Upper Thread Adjustment

A. Main thread adjustment device
The tension of the upper thread gets
tighter if the tension adjusting nut (1) as in
Fig. 16 is turned in a clockwise direction
and it gets looser when turned in the
opposite direction. The tension of the
thread should differ according to the
sewing conditions which depend on the
material, thread, stitch lenght etc.
Fig.16
B. Tension adjustment of thread take up lever spring
As in Fig 16, use a driver in the thread adjustment shaft groove (2)
to adjust the spring tension. The thread take up lever spring grows
tighter when the driver is turned clockwise and looser when turned
counter clockwise.
C. Auxiliary thread adjuster
Turn the auxiliary thread tension adjusting nut (1) in clockwise
direction to make the remaining thread lenght on the needle after
trimming shorter and in counterclockwise direction to make it longer, as shown in Fig.17. The
appropriate lenght of the upper thread remaining after trimming is 30mm - 40mm.
Fig.17
D. Thread release control
The thread release takes place simultaneously with the movement of the trimming solenoid. As seen
in Fig.24, the amount of thread release is controlled by moving the fixed position of the thread release
wire (2), which is connected with the clutch lever (1), left and right. Loosen the two fixing nuts (3) and
pull the cable wire (2) to the left. Then fasten the nuts (3) to release the thread to a large extent. If the
cable wire is pushed to the right and the nuts (3) tightened, the thread release happens on a lesser
scale. After adjustment, tighten the nuts (3) once agin and check whether the opening of thethread
guide plate (4) of the thread adjuster is about 05-1 mm when the thread releaser is in operation. There
should be no opening when the thread releaser is not in operation. The thread guide plates (4) should
be touching back to back.
Obr.18
Serie GF-105 13