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A
Pressure should be adjusted according to the material to be sewn.
B
Turning the pressure adjusting screw to adjust the pressure of presser foot
12) Timing between rotating hook motion and needle motion (Fig.19):
A
Set stitch length to "6";
B
When needle is lifted 2.4mm from the lower dead point,
the following position relationship should be maintained:
a.
The upper edge of needle eye should be 2.3mm
below
the hook point
b.
The hook point should be located at the center of
needle axis.
c.
Gap between the hook point and the side face of
needle should be 0.05 mm
13) Adjustment of Feed dog height (Fig.20):
Height of feed dog should be adjusted for individual fabrics
with the following cautions:
Gap between hook point and upper edge of
needle eye
L_~
... ..,.~~·· ~
~~:
:::, ____:.· O.OSmm
dead point
Center of
needle axis
---~
A
Fabric will be damaged if the feed dog extends too high or pressure of presser foot is too large
B
Even stitch length cannot be assured if the feed dog is too low or
pressure of presser foot is too small
C
Feed dog height should be measured at the point where the needle
~0.8mm
is at the top position.
For light fabric: Approx 0.8mm
For usual fabric: Approx l.Omm
For heavy fabric: Approx 1.2mm
Adjustment procedure:
A
Lay down the machine bed toward the other side;
.z;~ml1.0mm
I
Fig.20
B
Tum the balance wheel by hand stop when the feed dog is raise to its highest position from the surface
of needle place;
C
Loosen the Screw and adjust the height of the feed dog;
D
After adjusted, tighten the screw.
The feed dog height is factory-adjusted to 1.2mm
14) Adjustment the needle stop position (
00
21):
A
Loosen the needle bar Screw A;
B
Rotate the needle clamp B one circuit (amount of Adjustment is
0.6mm), or loosen the needle bar screw C, rotate position screw D
- 6 -
Needle bac soew ,__
~
Needle bar screw
A--o4llllll
Position screw
D
-
Needleclamp
B
~
s
Fig.21
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