JUKI LU-2800 Series Engineer's Manual page 75

Adjustment procedures
1) LU-2810-6, 2810-7, 2860-6, 2860-7
① Zero-point alignment for 2P feed adjustment
Set the standard feed adjusting dial ❶ to "0".
1.
Turn the 2P feed adjusting dial ❷ to counter-clockwise, remove
2.
the 2P feed adjusting dial screw ❸ .
Loosen clamping screw ❹ of the 2P feed adjusting pin arm ❺ .
3.
At this time, retain the 2P feed adjusting pin arm ❺ by means of
a tool so that it does not move out of position. If you have moved
it out of position, bring the standard feed adjusting pin ❻ and the
2P feed adjusting pin ❼ visually to the coaxial position.
Turn 2P switch ❽ ON. The air cylinder works to make the rela-
4.
tionship between the 2P feed adjusting base ❾ and the 2P feed
adjusting pin ❼ as shown in Fig. A.
Move the 2P feed adjusting pin arm ❺ to align the cam section
5.
(zero-point position) of the 2P feed adjusting base ❾ with the
2P feed adjusting pin ❼ (Fig. B). In that state, tighten clamping
screw ❹ of the 2P feed adjusting pin arm ❺ .
Carefully and slightly turn the 2P feed adjusting dial ❷ to clock-
6.
wise until a resistance is felt so that the 2P feed adjusting dial
screw ❸ is aligned with the 2P feed adjusting base ❾ .
Loosen setscrew  of the 2P feed adjusting dial.
7.
Turn the 2P feed adjusting dial ❷ to counter-clockwise, align the
8.
dial stopper  to the stopper.
Tighten setscrew  of the 2P feed adjusting dial.
9.
[Confirmation]
Set the standard feed adjusting dial ❶ to any pitch of "0" or more.
1.
Turn the 2P feed adjusting dial ❷ to counter-clockwise, align to 0
2.
point alignment position (it stops at the dial stopper  ).
Turn ON the 2P switch ❽ .
3.
Lower the reverse feed control lever  to align the cam section (0
4.
point position) of the 2P feed adjusting base ❾ with the 2P feed
adjusting pin ❼ (Fig. B).
5. Turning the handwheel, check to be sure that the stitch length is
zero (0). This shows that the zero-point alignment of the 2P feed
adjustment has been correctly carried out.
② Forward/reverse stitch length of 2P feed adjustment
[Confirmation items before adjustment]
• Make sure that the forward/reverse feed adjustment is matching.
• Set the standard feed adjusting dial ❶ to "9". (Set the 2P feed ad-
justing dial to standard pitch "6".)
Loosen clamping screw ❹ of the 2P feed adjusting pin arm ❺
1.
from the rear plate side.
Bring the standard feed adjusting pin ❻ and the 2P feed adjust-
2.
ing pin ❼ visually to the coaxial position. Then tighten clamping
screw ❹ of the 2P feed adjusting pin arm ❺ .
Turn ON the 2P switch ❽ , and check forward/reverse stitch
3.
length.
• When forward feed pitches are large. ⇒ To step 4.
• When reverse feed pitches are large. ⇒ To step 7.
Return to standard pitch (Turn OFF the 2P switch ❽ .), loosen
4.
clamping screw ❹ of the 2P feed adjusting pin arm ❺ . (Be care-
ful to loosen too much.)
Fixing the 2P feed adjusting pin arm ❺ so that it does not move
5.
out of position, slightly tilt the reverse feed control lever  and
tighten clamping screw ❹ of the 2P feed adjusting pin arm ❺ .
6. Return to step 3., check forward/reverse stitch length.
Return to standard pitch (Turn OFF the 2P switch ❽ .), loosen
7.
clamping screw ❹ of the 2P feed adjusting pin arm ❺ . (Be care-
ful to loosen too much.)
Slightly turn the 2P feed adjusting pin arm ❺ in the direction of
8.
the arrow in Fig. B, and tighten clamping screw ❹ of the 2P feed
adjusting pin arm ❺ .
9. Return to step 3., check forward/reverse stitch length.
Results of Improper adjustment
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