－
17
－
The nut may be removed if setscrew
❶
is excessively loosened. So, be careful.
Loosen setscrew
❶
by a half turn to
properly adjust the stroke.
The standard stroke of thread take-up spring
❶
is 6 to 8 mm, and the pressure at the start is 0.3
to 0.5 N.
1) Adjusting the stroke
Loosen setscrew
❷
, and turn thread tension
asm.
❸
.
2) Adjusting the pressure
Insert a screwdriver into the slit of thread ten-
sion rod
❹
, and turn it.
3) If you have changed the stroke of the thread
take-up spring, adjust the thread breakage
detecting plate, referring to
"7-6. Thread
breakage detector plate" p.48
.
4-7. Adjusting the thread take-up spring
❶
❷
0.5 mm
1) Lower the intermediate presser
❷
.
(Refer to
"4-3. Threading the machine
head" p.15
.)
2) Turn the handwheel to lower the intermediate
presser
❷
to its lowest position.
When the intermediate presser
❷
is in the
lowest position of its stroke, adjust so that the
clearance between the intermediate presser
and the cloth is approximately 0.5 mm.
3) Loosen setscrew
❶
and adjust the height of
intermediate presser
❷
.
❶
A
B
1) Remove the machine arm side cover.
2) Loosen setscrew
❶
and move it in the direc-
tion of arrow for adjustment.
3) If moving in the direction of
A
, the stroke will
be decreased. (Min. 4 mm)
If moving in the direction of
B
, the stroke will
be increased. (Max. 10 mm)
4-8. Adjusting the height of the intermediate presser (Only for the LK-1920)
4-9. Adjusting the intermediate presser stroke (Only for the LK-1920)
(1) Adjusting the intermediate presser stroke to 4 to 10 mm
❶
❷
❹
❸
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