JUKI MEB-3200 Engineer's Manual page 85

1. Place main shaft timing belt 1 on main shaft pulley 2 in advance and return main shaft 3 in the
direction of arrow mark B to assemble the timing belt.
2. After attaching C ring 4, move main shaft 3 in the direction ofarrow mark A and remove the thrust with
main shaft collar 7 so that a play does not occur.
3. When tightening the respective setscrews in thread take-up cam 6, needle bar rocking cam 5, main
shaft pulley 2 and main shaft collar 7, tighten them so that the screw No. 1 is placed on the flat work
of main shaft 3.
Further,
1) When tightening the setscrew of thread take-up cam 6, make sure that thread take-up cam roller
!5 is placed in the cam groove. In addition, provide a few clearance (K) between the attaching
section of thread take-up cam roller !5 of thread take-up !7 .
If there is no clearance, occurrence of motion torque or worn-out of parts will be caused.
2) When tightening setscrew !2 in needle bar rocking cam 5, perform it by turning main shaft 3 and
making sure that there is no torque.
3) When tightening screws @0 in tension pulley installing plate !8 , perform it while applying belt tension.
The standard value of belt tension is 27.4N in the direction of arrow mark E (downward direction to
the machine bed) at hole section F of tension pulley installing plate ! 8 . If the tension is excessively
high or low, breakage of belt or defective sewing will be caused.
4. Adjust the gear backlash of needle bar drive ! 6 referring to the item "5 - (3) Adjusting the backlash of
the needle bar driving gear".
5. After assembling, perform the looper timing adjustment (adjustment of looper cam).
Caution in assembling
7
!4
!3
6
K
5
!2
2
A
B
81
−
C
8
G
!5
!1
!6
1
3
4
−
9