JUKI MO-6000G Series Engineer's Manual page 82

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Trouble Case (1)
From the previous
page
4. The needle point Is crushed. (Double chain
stitch needle)
5. Overlocklng needle thread stitches are
skipped.
The lower looper falls
to
catch needle thread
loops. ·
Right aide Wrong side
r-----------------,
Needle guards
Needle No.
Thread tension
Height
or
the feed dog or nnedle
Needle guard
Contact with the looper
Lower looper
Adjustment of the loopers.
Needle thread presser
Needle
Needle guards
to lhe next page
Case(2)
A needle guard has been Improperly positioned, causing
the needle point to strike It.
Tho needle is too lhln for the materials.
The threAd tension is too high.
Tne feed dog Is too high, or the needle Is too low,
causing the needle to deflect wilh resultant needle
breakage.
The needle guard C Is too low, or its longitudinal position
Is not correct.
Tho tilt of the looper Is not correct. The longitudinal
motion of the looper Is nol correct.
The blade point has defective shape and does not catch
1
needle thread loops.
The clearance or the amount of retum Is not correct.
The duration In which the presser holds the needle
thread Is not correct, and unstable loop result.
The needle is bent or lfllJroperly oriented. A needle or
DC
x
1 Is used.
Incorrect height or clearance prohibits correct guide for
the needle. If a needle guard Is too high, loops are
crushed with consequent slltch skipping.
Check and Corrective measures
Refer to the pertinent Standard Adjustment.
Replace the needle with a thicker one.
Reduce the thread tension.
Refer to the related Standard Adjustment.
Increase the height of the needle guard
(C).
Check
the
clearance between the needle and needle guard.
Check the tilt of the looper. Correct the longitudinal motion
of the looper, and increase the clearance between the
looper and needle when the looper reaches Its most
retracted position.
Replace the lower looper.
Refer to the relevant Standard Adjustment.
Refer to the pertinent Standard Adjustment.
Replace the bent
needle.
Correctly orient and attach the
needle.
Use a DC x J27 needle for a stretchy thread.
Refer to the pertinent Standard Adjustment.
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