Adjusting The Looper; Adjusting The Height Of The Needle - JUKI MF-7200D Manual De Instrucciones

8. Adjusting the looper
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
1
A
[Lateral position]
The relaton between clearance A between looper 1
and the center of rght-hand needle and the needle
gauge s as shown n the table.
2-needle
Needle gauge Return amount A Needle gauge Return amount A
3.2 4.3
4.0 3.9
4.8 3.5
5.6 3.1
6.4 2.7
Loosen clamp screw 2 and laterally adjust looper
holder 3 n accordance wth the table.
9. Adjusting the height of the needle
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
B
1
A
2
1) Equally adjust clearance A between needles 1 and
needle holes 2 n the throat plate.
2) Adjust the heght of the needle bar so that the top
end of the needle hole of left-hand needle algns
wth the bottom end secton of the looper when the
looper travels to the extreme rght end and top end
B of the looper protrudes by approxmately 1.1 mm
from the left end of the left-hand needle, remove the
rubber cap 4 n the face plate, and tghten needle
bar bracket setscrew 3 to fix the needle bar.
6
Unit : mm
3-needle
5.6 3.1
6.4 2.7
C
– 17 –
1 2
5
3
[Longitudinal position]
Adjust so that the clearance between blade pont 5 of
the looper and medum needle 4 s 0 to 0.05 mm when
the top end of the looper comes from the extreme rght
poston to the center of the medum needle. After the
adjustment, tghten clamp screw 2 to fix the looper.
* The blade pont of the looper comes n contact wth
the rght-hand needle when rear needle guard 6
does not work. So, be careful.
4
A
Reference : Heght from the top surface of the throat
plate A to the top end of left-hand needle,
C when the needle s n the hgher dead
pont s as shown n the table.
2-needle
Needle gauge Heght of left-
hand needle, C
3.2 8.9
4.0 8.6
4.8 8.1
5.6 7.8
6.4 7.3
4
3
Unit : mm
3-needle
Needle gauge Heght of left-
hand needle, C
5.6 7.8
6.4 7.3