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6-11) Clogged stitch
11-A) Throat plate stitch tongue
A-1) Insufficient polishing or
Perform modification or replace the deformed
scratch on the throat plate
part.
stitch tongue
11-B) Rear spring for both side trim
B-1) Excessive left side width
Use an appropriate spring for material thickness.
of rear spring
11-C) Feeder height
C-1) Extremely low feeder
Make the feeder height proper.
Refer to the standard adjustment values.
11-D) Lower knife
D-1) Knife worn, wrong angles
Sharpen the knife, replace the knife if necessary,
of right, left, top, and bottom
sharpen the knife under conditions of holding
at sharpening, material inlet
the original knife angle, or make the material
without roundness
inlet round.
11-E) Upper knife
E-1) Knife worn, wrong angles
Sharpen the knife, replace the knife if necessary,
of right, left, top, and bottom
sharpen the knife under conditions of holding the
at sharpening, excessively
original knife angle, or set up the appropriately
weak pressure spring
pressurized spring. (Refer to the standard
adjustment values.)
11-F) Minor presser
F-1) Use of minor presser
There are two types of minor pressers. Replace
designed for thinner
the mounted minor presser with another minor
materials to sew material
presser for thicker materials.
with different thicknesses
11-G) Presser foot pressure
G-1) Insufficient presser foot
Adjust the presser foot pressure properly
pressure
6-12) Ridge of seam
12-A) Threading
A-1) Threading error
Refer to "6. How to conduct threading".
12-B) Retainer needle
B-1) No use of retainer needle
Use the retainer needle.
12-C) Upper fancy thread tension
C-1) Insufficient thread tension
Adjust the thread tension properly.
12-D) Bobbin thread tension
D-1) Excessive thread tension
Adjust the thread tension properly.
12-E) Bobbin thread cam
E-1) Delayed bobbin thread
Advance the bobbin thread cam position to the
cam position
proper level.
Trouble (1)
Trouble (2)
Cause (1)
Cause (2)
Check and corrective measures
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