– 11 –
14. Adjusting loop lift
[Checking items]
1
Needle
2
Blade point of lower looper
3
Lower looper
4
Gauge needle (Cut the top end of needle for use. L = 32.3 mm)
* Check that the clearance between the needle
1
and the blade point
2
of lower looper is 0.01 to 0.1 mm
E
.
* Turn the handwheel and check that the blade point
2
of lower loop-
er meets with the left side of gauge needle
4
when the lower looper
3
goes and back.
* The difference between the vertical positions when the lower looper
goes and back shall be 0.2 mm or less.
[How to perform adjustment]
○ Loosen the setscrews
C
of the lower looper support arm
D
.
○ Move the lower looper support arm
D
back or forth to adjust the
clearance between the needle
1
and the blade point
2
of lower
looper.
○ Tighten the setscrews
C
.
○ Adjusting the lower looper cam timing.
• Loosen the setscrews
A
of the lower looper cam
B
.
• Check the position of the blade point
2
of lower looper and the
gauge needle
4
while turning the lower looper cam
B
. Change
the position of the cam little by little so that the left side of gauge
needle
4
can meet with the blade point
2
of lower looper on
both ways of going and back.
• Tighten the setscrews
A
.
32.3 mm
Gauge needle
E
2
1
B
A
A
4
3
2
D
C
C
