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Trouble
From the previous page
1-6) Occurrence of puckering by
tightening a thread
Cause (1)
6-A) The course-woven and
close-woven stitches come to
occur because weaving yarns
of clothes are gathered with
stitches
Sewing
thread
Cause (2)
The needle thread is made easy to adjust
slightly to the low tension by using a weak
spring for a thread take-up spring and a thread
tension spring.
○ Thread take-up spring
Part No. B3128012000 ø0.6mm (Standard)
Part No. D3128555D00 ø0.5mm
Part No. B3128027000 ø0.4mm (For embroideries)
○ Thread tension springs
Part No. B3129012A00 ø1.0mm (Standard)
Part No. D3129555D00 ø0.9mm
(1)Part No. B3121352000 ø0.8mm
(2)Part No. B2017372000 ø0.6mm (Weaker springs)
Tension indicated for the lower limit of adjustment
(1) Some 20 grams for Tetoron thread (No. 80)
(2) Some 12 grams for Tetoron thread (No. 80)
Use a lightweight bobbin.
Part No. 22964001 (Anodized aluminum)
Use the bobbin case that is easy to adjust
even when the tension is low.
(1) Bobbin case for sewing ultra light-weight materials
→ Part No. 11105459
(The thickness of the bobbin tension adjust-
ing spring (popularly called: a brake shoe pin)
is 0.05 mm thinner than the standard one.)
(2) Bobbin case without an idling prevention spring
→ Part No. B18370120A0
It can be adjusted to the low tension be-
cause of no idling prevention spring.
* It is unsuitable for high-speed sewing because
the idle running of a bobbin is easy to occur.
To the next page
Check and corrective measures
(For light-weight materials)
(For light-weight materials)
(For ultra light-weight materials)
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