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3.4 Placing bobbin (Fig. 15)
Note: when bobbin is placed into the bobbin case, the
thread should be wound properly in the correct direction
shown in the figure. .
3.5 Drawing thread from the bobbin (Fig. 16)
A. Draw the thread end to bobbin slot shown in the
figure, and pull it out down through the inner bobbin
stop piece.
B. Hold the thread end with left hand, turn the hand
wheel slowly and get the bobbin thread, then draw them
a little apart from the presser foot.
.
.
1. Adjust the needle thread tension and bobbin
thread tension
All forms of stitches are shown in Fig. 20
The normal stitch of sewing machine is shown in Fig.
17A. If stitch is abnormal, the puckering and thread
breakage will occur, the needle thread tension and
bobbin thread tension should be adjusted so that the
normal stitch can be obtained. .
Normal stitch seam
Needle thread too loose or bobbin thread too tight
Needle thread too tight or bobbin thread too loose
Inner stop piece
Thread
Thread
Thread
Hook
Hook
Sliding plate
Sliding plate