Adjustment Of The Needle Entry Positions In The Right-Left And Front-Rear Directions - JUKI MS-3580 Betriebsanleitung

3. Adjustment of the needle entry positions in the right-left and front-rear directions

WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
Right-left direction
2
Front-rear
direction
Clockwise-counterclockwise
Torque
1.6 to 1.8N•m
5
Temporary needle
bar height
3
Top surface of the throat plate
3
B
Same in 3
needles 2
A
Center
direction
Hole at the top of the
needle bar 4
7
6
Torque
2.1 to 2.4N•m
1
2
2
12.5mm
(1) Needle entry
1) Needle entry position in the right-left direction
Mount 3 needles 1 to the needle clamp 2 . The
standard needle entry position "A" in the right-left
direction is the center of the needle hole of the throat
plate 3 .
2) Needle entry position in the front-rear direction
The standard needle entry position in the front-rear
direction is decided under the condition that the
clearance between the needle 2 and needle hole
of the throat plate 3 , "B", is the same for all of 3
positions.
Adjust the needle entry position in accor-
dance with the temporary needle bar 4
height of 12.5 mm.
Refer to "$-5. Adjustment of the needle bar
height".
(2) Checking procedure of needle entry
Mount 3 needles 1 to the needle clamp 2 and
1)
tighten the setscrew 5 .
Loosen the needle bar holding screw 6 set the
2)
temporary needle bar 4 height (12.5 mm), and
tighten the needle bar holding screw 6 temporarily
(approximately needle bar 4 it turns).
Insert the torque rod 7 into the hole at the top of
3)
the needle bar 4 and rotate the needle bar 4 in the
right-left direction to adjust the needle entry position
in the front-rear and right-left directions.
1. Improper needle entry position adjust-
ment may cause stitch skipping, needle
breakage, or thread breakage.
2. Needle entry adjustment is performed in
accordance with the temporary needle
bar height.
When the needle bar is at the upper
dead point, the temporary clearance be-
tween the top surface of the throat plate
3 and the tips of the needles 2 is 12.5
mm.
3. The needle bar height is temporarily
adjusted for needle entry adjustment. If
there is no problem with the needle bar
height, readjustment of the needle bar
height is not required.
Advance to the next step.
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