24
12
5.2 Adjusting the thread guide
The position of thread guide affects sewing quality
and therefore must be adjusted according to the materials
to be sewn and sewing conditions.
The normal relationship beween the position of
thread guide (Fig.17) and the materials to be sewn is as
the following table
a
b
c
d
e
25
Thread
guide
Position
Material
weight
Heavy
Medium
Light
Leftward
Center
Rightward
123
5.3 Adjusting the tension of needle thread and bobbin
thread
Fig.25 shows the various type of stitch forms
probably to happen when sewing.
Normal stitch form should be as shown in Fig.25 (a).
When abnormal stitches occur with puckering, loose
stitch or thread breakage, the tension of needle thread
and bobbin thread must be adjusted accordingly.
B
C
5
~
8
mm
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