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6-4. Adjusting upper thread length after
trimming
1. During the trimming process, main thread release tension is
not created but only auxiliary thread release ① tension is
created.
2. The adequate length of upper thread after trimming is 35 ~
40mm.
3. Increasing auxiliary thread release ① tension will make
upper thread after trimming short and decreasing the tension
will make it long.
6-5. Adjusting presser foot pressure
[ Figure 30 ]
6-5-1 Presser foot pressure
1. Make the presser foot pressure as weak as possible.
(But as weak as for sewing material not to slide.)
2. Unfasten the pressure adjusting nut ①.
3. Turn the pressure adjusting screw ② to adjust presser foot
pressure.
4. Fasten the pressure adjusting nut ①.
[ Figure 31 ]
Sewing style Causes Corrective action
Good sewing in balance
A stitch is skipped
Stitch lengths are not uniform
Puckering
Increase pressure
Decrease pressure
①
①
②
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