21.Position between the rotating hook and the needle
(Fig.18)
22.Adjusting the position of the needle bar(Fig.19)
33.Adjusting the position of the hook point(Fig.20)
18
19
20
8
1.6mm
0.05mm
Hook point
Lowerend of
the needle
B
A
D
C
B
A
D
When the hook point is lifted by 1.8mm from its lowest
position, the position of the needle and the rotating hook is
as shown in Fig.18:
1.The upper end of the needle eye is
0.3mm lower than
the hook point 1;
2.The hook point aligns with the point hook groove
directly;
3.The clearance between the hook point and the needle
groove is approx 0-0.05mm.
When the needle bar is 1.8mm lifted from its lowest
position,adjust the position of the needle bar to make the
needle eye
0.3mm lower than the hook point 1.
1.Turn the balance wheel by hand until the needle bar is
1.8mm lifted form its lowest position;
2.Move the needle bar B up ward and downward as
required;
3.After adjustment, tighten the needle bar connecting
screw A.
1.Lay down the machine head;
2.Remove the front retaining plate of the bobbin case
bracket;
3.Loosen the bevel gear two screws B and the two set
screws A and D of the lower shaft;
4.Turn the balance wheel by hand until the needle is
1.8mm lifted from its lowest position;
5.Turn the hook shaft bevel gear C until the hook point
aligns with the center of the needle groove;
6.After adjustment, tighten the lower shaft bevel gear
screw B,and tighten the screw A and D until screw A,B,
and D run in one line;
7.Install the front retaining plate of the bobbin case
bracket.
Upper end of
the needle eye
Up 2.0mm
Needle center
Hook point
