Thread tension?
I own this little gem of a machine. It definitely sews a perfect stitch. I'm assuming you own the green 3/4 size machine as denoted by your product number. The half size blue one pictured is incorrect.
Anyway, this machine sews a perfect stitch, due to the oscillating bobbin.
Most sewing machines with rotary (drop in) bobbins don't have an easily
accessible bobbin tension screw, which means your fabric is usually
slightly puckered. Fiddling with only the upper tension helps very
little. This frustrates me to no end for sewing long curtains, clothing
side seams, etc. Wrong tension causes them to hang with puckers, making
them look awful. With the Hello Kitty 3/4 size Janome, there is a screw
on the bobbin case which allows you to adjust for every thread diameter
perfectly. Always a perfect stitch, if you take the time to adjust this
screw.
To adjust the bobbin for a perfect tension, load the bobbin into
the bobbin case and thread it through the guide. Holding only the
thread between two or three fingers, let the bobbin case dangle below.
This will be slightly difficult, because the bobbin will want to fall
out of the case. Don't worry, just don't move it around too much and it
will stay in long enough for this test. If the metal bobbin case slowly
drops lower, unwinding thread as it goes, the thread is too loose.
Tighten the screw on the side of the bobbin case a little (about a
quarter turn.)
If the bobbin case seems to be dangling firmly, give the thread a
gentle tug, lifting up fairly quickly. If it doesn't release a couple
of inches of thread, it's too tight, loosen the screw. You know the
tension is perfect when a quick, light tug of the thread releases a
couple of inches of thread.
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