2.9 Thread tension
The interlacing of the threads must lie in the middle of the workpiece.
Thick and hard material requires a tighter thread tension than thin and
soft fabrics.
Too high thread tensions can lead to undesired ruffling and thread
breakage in case of thin material.
Setting the brake spring 4:
At a position stop of the machine head the brake spring 4 avoids an
after-run of the hook thread bobbin.
–
Set the brake spring 4 by alignment.
The brake power is set correctly when the brake spring 4 projects
beyond the surface 3 by approx. 1 mm.
–
When setting the tension spring 6 the brake power is to be taken
into account.
Setting the tension spring 6:
–
First set only a minimum tension of leaf spring 6 at the adjusting
screw 5.
Increasing the hook thread tension: Turn to the right
Reducing the hook thread tension: Turn to the left
–
With the bobbin inserted and the hook thread threaded through the
throat plate a uniform and easy thread pulling must be guaranteed.
Setting the needle thread tension:
–
Adjust the needle thread tension until a uniform stitch pattern is
achieved.
–
Set the tension of the needle threads at knurled nut 1 (right needle
thread) and knurled nut 2 (left needle thread).
Increasing the needle thread tension: Turn to the right
Reducing the needle thread tension: Turn to the left
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