Adjustment Of Rear Needle Guard - JUKI MS-3580 Serie Manual De Instrucciones

7. Adjustment of rear needle guard

WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
Longitudinal directions of rear needle guard
1.5mm
8
3
1
Vertical direction of rear needle guard
When the right side face of the
needle is aligned with the blade
Up-down
point of the looper
direction
!0
9
3
2 ・ 4 ・ 6
3 ・ 5 ・ 7
The clearance provided
between the blade point of
the looper and the needle
should be 0 to 0.05 mm.
4
Right and left
directions
5
7
3
1
Longitudinal
directions
2
Distance between
the needle guard
1
and the bottom
end of the needle
eyelet : 0.5 to 2
mm
6
2
1
− 32 −
(1) Longitudinal adjustment of the rear needle guard
1) When the pulley is turned counterclockwise and
the rear needle guard 1 advances to the most
front position, it lightly touches the left needle 2
(If necessary, press it lightly so that all the needles
can be guarded.) and then tip of the front looper 3
passes.
When tip of the front looper 3 reaches the position
1.5mm apart from the left side of the left needle 2
while this front looper 3 moves in right direction,
the standard position is that the needle tip comes in
contact with the rear needle guard 1 .
The relationship between the middle needle 4 and
2)
the rear looper 5 and between the right needle 6
and the middle looper 7 is also required to assume
the same conditions as (1) -1). above in standard
positioning.
Loosen the setscrew 8 and move the rear needle
3)
guard 1 forward or backward to adjust.
After adjustments, tighten the setscrew 8 .
4)
1. To change the stitch length, readjust-
ment of the front and rear positions is
also needed for rear needle guard 1 .
2. When the rear needle guard is adjusted,
recheck the non-presence of a clearance
between the respective needles ( 2 , 4
and 6 ) and the respective loopers ( 3 ,
5 and 7 ). If any clearance is perceived,
readjust the related conditions.
3. Is a clearance is actually developed
between the respective needles ( 2 , 4
and 6 ) and rear needle guard 1 , this
can be a cause of needle breakage or
stitch skipping.
4. When rear needle guard 1 presses the
respective needles ( 2 , 4 and 6 ) too
much, this can be a cause of needle tip
being blunt.
(2) Height adjustment of rear needle guard
The relationship between the middle needle 4 and
1)
the rear looper 5 and between the right needle 6
and the middle looper 7 is also required to assume
the same conditions as (1) -1) above in standard
positioning.
Loosen the setscrew 9 and move the rear needle
2)
guard base !0 vertically to adjust the height.
After adjustments, tighten the setscrew 9 .
3)