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Adjustment Procedures
Results of Improper Adjustment
™
S t i t c h s k i p p i n g o r t h r e a d
breakage will result.
™
Loose stitches will result.
1) Standard of the lowest dead point of the needle bar
1. Set the stitch dial to “0”.
2. Turn the handwheel to bring needle bar
1
to the lowest dead
point of its stroke.
3. Loosen the setscrew in the face plate to remove the face plate.
4. Loosen clamping screw
2
in the needle bar holder. At this
time, loosen the screw to such an extent that needle bar
1
moves up and down by hand since needle bar
1
drops if the
screw is fully loosened.
5. Adjust the distance from the lower end of needle bar frame to
the lower end of the needle bar to dimension A. Then tighten
clamping screw
2
in the needle bar holder.
2) Needle-to-blade point of hook timing
1. Set the stitch dial to “0”.
2. Loosen two setcrews
3
in the screw gear (large).
3. Turn the handwheel and when dimensions B and C are
approximately obtained, loosen setscrew A
4
and setscrew B
8
in the hook shaft driving saddle. Then move the hook driving
shaft saddle to the right or left to adjust the cearance between
needle
5
and blade point
6
of the hook to dimension D. Then
securely tighten setscrew A
4
and setscrew B
8
.
4. Turn the handwheel and move the screw gear (large) to the
right or left so that needle
5
aligns with blade point
6
of the
hook when needle bar
1
is raised from the lowest dead point
of its stroke to dimension B. Then tighten two setscrews
3
.
5. Turn the handwheel and loosen clamping screw
2
in the needle
bar holder to adjust so that the distance from the top end of the
eyelet of needle
5
to blade point
6
of the hook becomes
dimension C when needle bar
1
is raised from the lowest dead
point of its stroke to dimension B. Then tighten again the
clamping screw.
6. Set the stitch dial to the maximum and check that needle
5
does not come in contact with blade point
6
of the hook.
3) Adjusting the needle guard of the hook
1. Bend needle guard
7
and adjust so that the needle guard
7
comes in contact 0.1 to 0.2 mm with the needle.
(Caution) 1. After tightening the hook shaft screw gear,
check that the hook shaft has no thrust play.
2. Check that the hook shaft screw gear has
backlash.
