KONWA KW-505 Instruction Manual & Parts List page 6

8. CATCHING BOBBIN THREAD
Hold the end of the upper thread with the left hand, and with your right hand turn gently
the balance wheel towards you till the needle comes down and up again to its highest
position. Pull the end of the thread in your left hand gently, and it will bring up the
bobbin thread (Fig. 13). Then lay the ends of both then threads under the presser foot but
a bit away from you (Fig. 14). Place the material under it and lower the presser foot,
thereafter start sewing.
Fig. 13 Fig. 14
9. REGULATING TENSION OF THE UPPER AND LOWER THREADS
If the tension of the both upper and lower threads is normal the result will be perfect and
the two threads will cross each other just inside the sewing material (Fig. 15)
Fig. 15 Fig. 16 Fig. 17
But if the upper thread is too tight or the lower one too loose, they will cross each other
on the upper surface of the fabric (Fig. 16). In this case, you should either loosen the
upper thread or tighten the lower one.
If the upper thread is too loose or the lower one too tense, so that they cross one another
on the under side of the fabric (Fig. 17), you will have to tighten the upper thread or loose
the lower one.
Sometimes although the threads are locked inside the fabric, floating stitches appear, that
means both the upper and lower threads are too loose. For correcting this, both upper and
lower threads should be tightened.
Sometimes although the cross point is right inside the sewing material, the material may
wrinkle and the thread is liable to break; for the upper and lower threads are still too tight.
So it is necessary to loosen them both.