Bh Sewing Length - Brother XM3700 Service Manual

Adjustment
[Standard]
At pattern selection dial [1] (buttonhole stitch bar tack), set the button 20 mm in diameter to
the BH presser, when the bar tack sewing is executed, the inside length of the stitch bar tack
should be 22 ±1 mm (21 to 23 mm).
[Adjustment]
1. Turn off the power, and then remove the foot controller.
2. Remove the face plate and the pattern selection dial, and remove the front cover and
the rear cover.
3. Attach the size 90/14 needle.
4. Attach the pattern selection dial.
5. Turn the pattern selection dial until the [1] is the topmost
position.
6. Turn the stitch length dial until the [F] is the topmost position.
7. Pull down the BH lever to the downmost, and then switch the
position to the rear side by pushing the BH lever from the front
to the rear.
8. Set up the BH foot to 20 mm, and then set it.
9. Attach the foot controller, and turn on the power.
10. Execute the bar tack sewing to the double broadcloth with a
schappe spun thread #60, and check the inside length of the
stitch bar tack (the upper side and the lower side).
*Key point
• Sew the bar tack of the buttonhole till the last. (Fig. 1 "1")
When this sewing is stopped halfway, the next bar tack of the buttonhole is not sewn correctly.
BH lever
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BH sewing length

BH foot
4 - 39
Schappe spun thread #60
BH foot
Fig.1
Broadcloth (double)
Stitch length dial
Pattern
selection dial
5 mm
20 mm
Check
1