.
17. REPLACEMENT OF LOOPER DRIVING CAM AND ROLLER
1) To easy reassemble, machine should be turned 90 degrees to left side.
2) Reassemble Chain looper driving cam (8), Lower looper driving cam (7),Needle driving rod set(6),
Balancer (5), Upper looper driving cam (4), Spring(3) and Machine engage plate set(2).
3) Replace the main shaft with Timing pully (1).
4) Replace Feed dog driving cam (9) and Knife driving cam (10).
5) Set handwheel to the original position before replaced (A).
6) Tighten the screws of Machine engage plate set (2) and Timing pulley (1) without a play.
7) For Model BLE1, BLE1AT, BLE3ATW, BLE1SX and BLE1LX
Adjust the distance of Lower driving looper cam to be12mm between rightside of left bush and
leftside of Lower looper driving cam.
For Model BLE8, BLE8W and BLCS
Adjust the distance of Chain looper driving looper cam to be 0.2mm between rightside of left bush
and leftside of Chain looper driving cam.
8) Turn handwheel and align First Screw of Lower looper driving cam (7), tighten 2 screws.
Note: The flat of Lower driving cam is 90 degrees different from others.
9) Turn handwheel and align First screws of Feed dog driving cam (9) and Knife driving cam (10).
10) Tighten 4 screws.
11) Replace Needle driving rod and Needle driving arm(14)
12) Make sure handwheel turns smoothly.
To adjust and checkings
1) Needle height
Turn hand wheel, and bring needle bar at highest position. Turn Needle height adjuster to correct position.
See page 2 and 3.
2) Adjustment of engage position
Loosen 2 screws of Machine engage plate set.
Turn handwheel, and find out the end of joint pipes are in the center of looper joint pipes.
Turn Machine engage plate set, and engage threading button.
Keep Machine engage plate to rightward, and tighten 2 screws firmly.
Make sure handwhell does not have a play rightward and leftward direction.
Engage the lock button again, and make sure Jet-Air sistem does work well or not.
See page 13.
3) Timing of A.T.D. system
CORRECT TIMING- When Upper looper is lowest position, Front discs should be just shut perfectly.
Loosen 2 screws of timing pully (1) (or upper position timing pully), Turn handwheel and lower the
Upper looper at the bottom position.
Turn timing pully at front discs have just shut position.
Keep timing pully to leftward, tighten 2 screws firmly.
Make sure handwhell does not have a play rightward and leftward direction.
See Service manual.
3) Timing of Feed dog
CORRECT TIMING- When tip of the Needle come down on the needle plate, top of feed dog should
come down on the surface of needle plate.
If you tighten first screw to screw flat of main shaft, the timing is correct automaticaly.
4) Timing of Knife
CORRECT TIMING- When the Needle come down, the knife should come down on same timing.
If you tighten first screw to screw flat, timing is correct automaticaly.
5) Position of Upper looper and Lower looper
Make sure Upper looper and lower looper are correct position.
See 3 and 4.
6) Position of Chain looper
Make sure Chain looper is correct position.
See Service manual.
19
To reassemble
