−
87
−
Trouble
Cause (1)
Cause (2)
Checking order and adjusting procedure
Page
5. Crest of seam wobbles.
6. Thread frays.
5-1) Wobbling at the start of sewing
5-2) Wobbling at the parallel section
6-1) Needle thread frays when
pulling it at the end of sewing.
6-2) Bobbin thread frays when
pulling it at the end of sewing.
6-3) Set value of tie stitching on the
panel is improper.
1)-A
Tension at the start of sewing
is too low.
1)-B
Tension at the parallel section
is too low.
1)-C
Stroke of the thread take-up
spring is too large.
1)-D
Position of the needle thread
trimmer is too high.
2)-A
Tension at the parallel section
is too low.
2)-B
Tension of the thread take-up
spring is too low and the stroke
is insufficient.
1)-A
Bar-tacking thread tension is
too low.
1)-B
Bobbin thread tension is too
low.
2)-A
Bar-tacking thread tension is
too high.
2)-B
Bobbin thread tension is too
high.
3)-A
Width of tie stitching is too wide.
3)-B
Number of stitches of tie
stitching is too small.
Increase the tension at the start of sewing.
Increase the tension at the parallel section.
Decrease the stroke of the thread take-up spring and increase the
spring pressure.
Lower the needle thread trimmer to such an extent that it does not
come in contact with the work clamp check holder or the presser foot.
Increase the tension at the parallel section.
Increase the tension of the thread take-up spring and increase the
stroke.
Increase the bar-tacking thread tension.
Increase the bobbin thread tension.
Decrease the bar-tacking thread tension.
Decrease the bobbin thread tension.
Narrow the width of tie stitching.
Increase the number of stitches of tie stitching.
(See page 63.)
(See page 56.)
(See page 56.)
Summary of Contents for LBH-1700
Page 1: ...R ENGINEER S MANUAL 29339504 No 04 Electronic Buttonholing Machine LBH 1700 Series ...
Page 55: ... 51 MEMO ...
Page 124: ... 120 ...
