JUKI MO-6700D Series, Руководство пользователя

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Trouble Case (1) Case (2) Check and Corrective measures Page
10. Triangle double chain needle Double chain looper The chain looper is too high and too close Correct the height of the chain looper by 16
thread stitches are skipped. to the throat plate, or has bad shape. pushing it down until it cones into contact
with the stopper. Replace the chain looper
having a bad shape.
Adjustment of looper The return is not enough, causing the Refer to the related Standard Adjustment. 16
needle to miss the loop.
Thread tension The needle thread tension is too low. Slightly increase the needle thread tension.
Stitch length The stitch length is as small as 1.5 mm Slightly increase the stitch length.
or less.
Adjustment of loopers for producing chain-off 28
thread without materials requires higher
accuracy than that with materials.
Needle guard A needle guard is too high, and catches Refer to the related Standard Adjustment. 18
needle thread loops.
Double-chain stitch needle thread The needle thread guide is installed too Refer to the related Standard Adjustment. 36
guide. high, and it fails to tense the thread.
The needle fails to catch the
needle thread loop on the double
chain looper, resulting in the stitch
skipping shown below.
11. Overlocking chain-off thread is bad. Position of the throat plate The throat plate has been improperly Correctly position the throat plate.
positioned longitudinally, and chain-off
thread gets in between the main feed dog
and throat plate, causing defective chain-off
thread.
Feed dog The auxiliary feed dog has scratch. Repair or replace the auxiliary feed dog. 20
The auxiliary feed dog is too high, and Refer to the pertinent Standard Adjustment.
interferes with chain-off thread. The auxiliary
feed dog is too low.
(Lower than the main feed dog by more
than 0.5 mm)
Adjustment of looper Adjustment of loopers for producing Refer to the related Standard Adjustment. 8
chain-off thread without materials requires
higher accuracy.
Thread tension The thread tension is too low. Slightly increase the tension.
The needle thread tension is too high, Check whether the needle thread take-up 36
causing damaged balance with other guide or needle thread guide is positioned
thread tension. too high with consequent excessive needle
hread tension. And if so, correct it.
Provided that no chain-off trouble oc-
curred when sewing operation was
done with materials set on the machine.
Defectively interlaced loop
Needle thread
The needle thread extends
to the adjacent stitch.
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