JUKI LU-1510N Engineer's Manual page 25

Adjustment Procedures
2) Top feed cam timing
™ In case of the machine without thread trimmer
1. Set the stitch dial to "6".
2. Adjust the amount of alternate vertical movement of both the
walking foot and the presser foot to the standard (the lower
engraved marker line on the top feed rear arm aligns with the
center of the hinge screw). Refer to "(11)-1) Amount of alternate
vertical movement".
3. Loosen the setscrew in the window plate and remove the
window plate.
4. Loosen two setscrews 1 in the top feed cam.
5. Turn top feed cam 5 to the position where three points of top end 2 of the needle, top surface 3 of the
throat plate and walking foot 4 (pressing face) are aligned with one another on condition that the
amount of alternate vertical movement of both the walking foot and the presser foot is equal.
6. Securely tighten two setscrews 1 in the top feed cam.
7. Attach the window plate.
(Standard) The screw No. 2 in the top feed cam faces to the direction of the center (direction of
arrow mark) of the small edge section of top feed rod 6 at the lowest dead point of the needle
bar.
™ In case of the machine without thread trimmer
™ When DL device is not provided
1. Set the stitch dial to "6".
2. Set the alternate vertical dial to "3".
3. Remove the window plate setscrew and remove the window plate and the window plate packing.
4. Loosen two setscrews 7 in the top feed cam.
5. Turn top feed cam 8 to the position where three points of top end 2 of the needle eyelet, top surface
3 of the throat plate and walking foot 4 (pressing face) are aligned with one another on condition that
the amount of alternate vertical movement of both the walking foot and the presser foot is equal.
6. Securely tighten two setscrews 7 in the top feed cam.
7. Attach the window plate and the window plate packing.
(Standard) The screw No. 2 in the top feed cam faces to the anti-operator's side at the highest dead
point of the needle bar as shown in the figure. (Adjust the timing at the position where three
points are aligned with one another when top end 2 of the needle, top surface 3 of the throat
plate and walking foot 4 are coming down.)
™ When DL device is provided
1. Set the stitch dial to "6".
2. Remove the window plate setscrew and remove the window plate with cylinder and the window plate
packing. At this time, it is easier to remove them when the scale of alternate vertical dial is set to the
maximum.
3. Set the alternate vertical dial to "3".
4. Loosen two setscrews 1 in the top feed cam.
5. Turn top feed cam 5 to the position where three points of top end 2 of the needle eyelet, top surface
3 of the throat plate and walking foot 4 (pressing face) are aligned with one another on condition that
the amount of alternate vertical movement of both the walking foot and the presser foot is equal.
6. Securely tighten two setscrews 1 in the top feed cam.
7. Attach the window plate with cylinder and the window plate packing.
(Standard) The screw No. 2 in the top feed cam faces almost front at the lowest dead point of the
thread take-up. (Adjust the timing at the position where three points are aligned with one another
when top end 2 of the needle, top surface 3 of the throat plate and walking foot 4 are coming
down.)
Results of Improper Adjustment
™ Pitch error at high or low speed
is apt to occur.
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