21.Timing between the needle and the rotating hook(Fig23
、
24
、
25
、
26)
24
-10-
23
22
A
B
C
D
E
(B) The needle thread tension is too weak or
the bobbin thread is too strong, turn the tension
regulating thumb nut clockwise to make the needle
thread get more tension or turn the bobbin case ten-
sion regulating screw counter clockwise with small
plastic screw driver to make the bobbin thread get
less tension (Fig.22)
( c) Other abrormal stitches as shown in Fig.20
(d) .(e) , adjustment can be made which reference to
the above methods.
.
.
1 Adjusting the position of needle bar
Turn the balance wheel to locate the needle
bar ( C ) at its lowest position, remove the rubber
plug in the face plate (A), then loosen the needle
bar ( C ) connecting stud clamping screw (B) and move
the needle bar ( C ) vertically to locate the timing
position ( The timing position of the needle bar is:
when the needle bar at its lowest position, the center
of needle eye ( D ) coincide with inside surface (E)
of bobbin case holder as shown in Fig.24). Tighten
clamping screw(B), plug the rubber plug.
.
.
