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Adjustment
[Standard]
Set the button hole foot assy, when the bar tack sewing is executed to the double
broadcloth with a schappe spun thread #60, the standard is as follows.
• The number of left reverse/right forward stitches should be 35 to 50 per 20 mm.
• The stitch difference should be within ±10.
[Adjustment]
1. Attach the size 90/14 needle.
2. Set the BH foot.
3. Attach the foot controller, and turn on the power.
4. Execute the bar tack sewing 20 mm or more to the double broadcloth with a schappe spun thread #60, and
check the number of stitches of the left reverse stitch and right forward stitch per 20 mm.
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Left and right stitch of buttonhole stitch length
BH foot
3 - 21
Check
Check
Broadcloth (double)
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