2.8 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 material.
In case of thin material a too high thread tension can lead to undesired
ruffling and thread breakage.
Setting the brake spring 4:
In case of a positioned 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 adjusted correctly when the brake spring 4
projects approx. 1 mm above surface 3.
–
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.
Increase the hook thread tension: Turn to the right
Reduce 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 pull-off must be assured.
Setting the needle thread tension:
–
Adjust the needle thread tension until a uniform stitch pattern is
achieved.
–
Adjust the tension of the needle threads at knurled nut 1 (right
needle thread)
and knurled nut 2 (left needle thread).
Increase the needle thread tension: Turn to the right
Reduce the needle thread tension: Turn to the left
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