9
104 72 79-26
24. Disconnection when winding the bobbin
When winding up the lower thread onto the bobbin the machine
should stop when there is a min. of 1 mm between the edge of the
bobbin and the thread
17. Pivot height
When the presser foot ”R” is in its ”Pivot” position the distance between the
lower side of presser foot ”R” and the needle plate should be 1.50 mm +/-0.20
mm.
18 and 19. Stitch length balance
The darning stitch shall look according to illustration.
20. Lower thread tension (thread tension of the bobbin case)
The thread tension spring of the bobbin case shall give a resistance of 12 - 20 g
when pulling the thread slowly, using normal polyester thread.
22a. Upper thread tension 830/850
When the thread tension dial is set at 5, a correct take-up should be obtained at
straight stitching and zig-zag using normal cotton fabrics and polyester thread.
23. Setting the thread take-up spring
The thread take-up spring should have completed its movement when the the
needle eye reaches the fabric. The check has to be carried out at straight stit-
ching and using normal cotton fabrics and polyester thread.
Settings - Quick refrance
21. Thread tension releaser 830/850
When tension index dial is set at 9 and the presser foot is in highest position the ten-
sion releaser should have open the thread tension discs, and the tension pin should
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22b. Upper thread tension 870
Adjust the upper thread tension in service menu 3, function no. 0. A correct
take-up should be obtained at straight, zig-zag, button hole and satin stitching
using normal cotton fabrics and polyester thread.
0-3 mm
1,50 mm +/-0,20 mm
1 mm
