JUKI AMB-289 Engineer's Manual page 43

Procedures of disassembling / assembling
Assembling of the main shaft
1. Enter main shaft !8 to counter weight !9 , and tighten taper
screw @3 and setscrew @2 .
2. Enter main shaft !8 until it goes no further, tighten two
setscrews !3 while taking thrust with sprocket bush A !2 .
3. Tighten two setscrews !5 in main shaft bearing !4 .
4. Adjust to the position of gear B @5 , and tighten two
setscrews !7 in gear A !6 .
(Caution) When replacing timing belt 4, proceed to step 5.
If not, proceed to step 10.
5. Temporarily tighten three setscrews @4 at the center of the
slot of main shaft sprocket 5.
6. Turn ON the power to display the needle bar angle of the
sensor check screen.
(Refer to "39. USING CHECK PROGRAM" in the Instruction
Manual.)
Angle of the main motor is displayed. Put timing belt 4 to
respective sprockets 5, 6 and 7 at the position where the
display of "0" degree almost aligns with the upper dead point
of needle bar, and the looper is roughly adjusted.
7. Temporarily fix the idler pulley in the state that timing belt 4
is slightly tense, loosen setscrew @4 in main shaft sprocket
5, adjust it to the position where "0" degree of the panel
aligns with the upper dead point of needle bar, and tighten
setscrews @4 .
8. Loosen setscrews 9 in the idler pulley and tighten
setscrews 9 while applying tension to timing belt 4.
9. Adjust the looper to the yoke slide. "Refer to (2) Adjusting the
clearance between the needle and the looper, and (4)
Adjusting the position of the yoke slide." Proceed to step 12.
10. Enter main shaft sprocket 5 to sprocket bush A !2 , adjust it
to the position where marking has been performed, and
tighten setscrews @4 .
11. Adjust timing belt 4 to the marking, put it to respective
sprockets 5, 6 and 7, and tighten two setscrews 9 in idler
pulley installing plate 8 while applying tension to timing belt
4.
12. Make sure of the direction of needle connecting rod @6 , and
simultaneously entering square block @7 , assemble needle
bar rocking base @8 . Enter needle bar rocking shaft @9 and
tighten setscrew #0 while taking the lengthwise thrust.
"Refer to (3) Disassembling and assembling of the needle
bar rocking base and the needle bar crank rod".
13. Assemble frame support plate #1 , and tighten setscrew #2
while talking the lengthwise thrust at the lower section of
needle bar rocking base @8 .
14. Attach face plate 3, rear cover 1, arm cover 2 and needle
#3 .
Caution in disassembling / assembling
™ Assemble main shaft !8 so that
™ Assemble main shaft !8 so that
™ Press idler pulley 8 with 85N
™ Press idler pulley 8 to the right-
(Reference) There is a screw
− 39 −
screw No. 1 comes to the flat
section.
screw No. 1 comes to the flat
section.
load, and tighten two screws 9.
Make sure again that "0" degree
of the panel aligns with the upper
dead point of needle bar. If not,
perform re-adjustment.
hand side with 85N load, and
tighten two screws 9.
tapping of M5 in the
bearing fulcrum
shaft of idler pulley
8. Attach screw or
the like to this
tapping to draw.