Baby Lock Crown Jewel III BLCJ18-3 Instruction And Reference Manual page 42

Problem Cause
Upper tension too tight
Improper threading
THE NEEDLE
The needle is bent or
BREAKS
not installed properly
The needle hits the
throat plate
The tension is not
STITCHES ARE
balanced
PUCKERED
Needle too large for
material
The tension is not
STITCH
balanced
QUALITY
IS POOR
Bobbin case is
damaged, corroded,
dirty, etc.
Moving the machine too
fast for needle speed
selected
Machine Stitch Regulator
wheels do not consistent-
ly touch the track
Correction
• Loosen upper tension.
• Inspect that the thread take-up lever, thread stirrup or tension
spring are all threaded correctly and that the thread is "flossed" into
the tension discs
• Replace or correctly change the needle. Make sure that the needle
is pushed up into the needle bar clamp until it can go no farther (vi-
sually check that it is up to the top of the stop/sight opening above
the needle bar clamp screw). Failure to do so can cause damage in
the bobbin area and throat plate.
• Correctly position the needle, throat plate or hopping foot.
• Balance the tension of the needle thread after ensuring the bobbin
tension is adjusted correctly (refer to page 24).
• Replace the needle with a size better suited for the fabric.
• Adjust the tension of the needle thread if it is not balanced with that of
the bobbin thread.
• Since thread slides over the surface of the bobbin case at a high
speed, make sure the case is free of any material that could impede
thread passage through the machine.
• Synchronize machine movement and needle speed to get roughly 8
to10 stitches per inch. Elongated stitches are an indication of mov-
ing the machine too fast for the current speed.
• Clean the track and the rubber wheel on each stitch regulator.
Even a tiny speck on the wheel can cause problems with regulation.
Check the spring tension on each stitch regulator assemblies. If the
retaining nut is even slightly too tight it can prevent the wheel from
properly pressing against the track.
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