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e) Setting the reverse bead (stitch density)
The reverse bead must be adapted to the forward bead. The pattern indicator is used to
count the stitches (36 stitches per revolution), without thread.
Forward bead
Buttonhole knob to 1,
pattern indicator 2
complete turns
Reverse bead
Buttonhole knob to 3,
pattern indicator 2
complete turns.
Measure difference in length between forward and reverse beads. They should both be
the same length. It is permissible for the reverse bead to be 1 mm shorter.
Correction:
The screw 1 58 is designed as an
eccentric. Correct with a spanner
(width across flats 7) as shown.
Check the bar tack spacing (section
2) again after correcting. Basic'
position of eccentric screw:
marking notch horizontal.
Sewing test
- Thread Nm. l00,3-ply, left-twist, or
Darning thread Nm. 100,2-ply, right-twist
-
Thread bobbin case thread in the additional tension device
-
Needle system 130/705 H (neither blunt nor bent)
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