JUKI TL-2200QVP Service Manual & Parts List page 15

2013.3.6 最終校正用
1) Proper position of the moving knife
1. The correct position of the moving knife 8 when the moving knife has gone
back farthest is such that the tip of the moving knife is 3 to 3.5 mm away
from the center of the needle. If the retreat of the moving knife 8 is not
enough, the knife may fail to catch the needle or bobbin thread at the time
of thread trimming. On the contrary, if the moving knife 8 retreats exces-
sively, the moving knife 8 may hit the feed dog.
2. To avoid these problems, be sure to accurately position the moving knife 8 .
The standard moving knife home position is obtained by bringing the
periphery of the moving knife 8 in contact with the V groove of the knife
mounting base.
2) how to position the moving knife
The position of the moving knife is adjusted by changing the lateral position
of moving knife link pin 1 while the machine is at rest.
1. Loosen the lock nut of moving knife link pin 1 .
2. Move the link driving magnet pin 1 to the right or left to make the V groove
3 meet the periphery of the moving knife 8 , referring to the home position.
3. Retighten the lock nut of the moving knife link pin 1 when the proper po-
sition of the moving knife has been obtained. As the moving knife link pin
1 is moved to the right, the retreat of the moving knife increases. As it is
moved to the left, the retreat of the moving knife decreases.
3) When the moving knife can not be properly positioned merely
by adjusting the position of the link driving magnet pin
1. Loosen adjusting nut of moving knife link pin 1 .
2. Adjust so that the center of the moving knife link pin 1 aligns with V groove
3 of the knife driving arm 2 , and fix link driving magnet pin by tightening
the lock nut.
3. Loosen two screws 5 of the knife driving arm stopper 4 .
4. Move the knife driving arm 2 to make the periphery of the moving knife 8
meet the V groove of the mounting base, and fix knife driving shaft stopper
4 by tightening two screws 5 .
5. Loosen the two screws of thread trimmer cam 7 and cam collar 6 .
6. Align red dot on the handwheel with dot on the cover.
7. Manually turn the cam until screw 9 faces toward you.
Then press the thread take-up picker !0 to the right.
8. Move the trimmer cam 7 to the right or left to engage the trimmer cam 7
with the cam roller.
9. With the trimmer cam 7 engaged with the cam roller, turn the trimmer cam
7 in the direction of the arrow toward you until it stops, while lightly pulling
the trimmer cam 7 to the right.
10. Tighten screw 9 of the trimmer cam 7 for preliminary installation.
11. Then confirm :
(1) that the specified marker dots on the cover and handwheel are in
alignment,
(2) the roller smoothly fits in the cam groove, and
(3) the retreat of the knife has been set to 3 to 3.5 mm.
12. Securely tighten the two screws of the cam.
13. Press the cam collar 6 against the trimmer cam 7 and fix it by tightening
the screw.
(caution) note that a minute change in the lateral position of the moving
knife link pin 1 will greatly affect the retreat of the knife.
confirm that the moving knife 8 spreads the threads as shown.
adjustment Procedure
13
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results of improper adjustment