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For the bird's nest prevention type (CB)
Trouble Ca1use 1 Cause 2 Corrective measure and adjusting procedure
11.Needle thread clamp failure
12.Bobbin thread is pulled up on the cloth at
the start of sewing.
13. Needle thread cutting is dull.
14. Interference of wiper with needle
11-1) Position of the wiper is improper.
11-2) Air pressure is decreased.
11-3) Dust bag is clogged with excessive
thread waste.
11-4) Thread trimming or wiper is performed
at the position where there is no
sewing product.
11-5) Needle thread length is short.
Thread does not reach the clamp head.
11-6) Length of left/right needle threads is
uneven.
(Thread such as cotton thread or the
like which is not elastic is used.)
12-1) When remaining amount of needle
thread (thread take-up lever) after
completion of needle thread clamp is
small, bobbin thread is brought to the
position above the cloth at the first
stitch of the start of sewing.
13-1) Worn-out of needle thread cutting knife
13-2) Installing position of knife is improper.
14-1) Needle UP stop position is improper.
14-2) Moving path of the wiper is improper.
14-3) Position of the wiper is improper.
Place the wiper at the proper position.
Adjust the air pressure to 0.6MPa.
Remove thread waste or the like from the dust bag.
Perform thread trimming or wiper on the cloth.
Adjust the pre-tension and lengthen needle thread length.
(Adjust the needle thread length from the clamp head to approximately 20 to 35 mm.)
Change the kind of thread.
1 Refer to (33) Adjusting the position of the thread draw-out wire. (When the amount of
needle thread draw-out is desired to be increased)
2 Perform thread tension release at the start of sewing.
(Refer to function setting No. 100)
3 Make needle thread draw-out motion again after needle thread clamping. (Refer to function
setting No. 18 : 2 .)
Make function all items 1, 2 and 3.
Replace the knife with a new one. (Refer to Instruction Manual.)
Adjust it to the proper position. (Refer to Instruction Manual.)
Refer to (27) Stop position of the needle after thread trimming (Needle UP stop).
Re-adjust following 2) CB type of (37) Position of the wiper.
clamp head
20 to 35mm
Needle thread
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