JUKI LU-2800 Series, Руководство инженера

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WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause Checking Corrective measures
2. Thread slips off the
needle eyelet.
2-1) Needle thread slips off the needle eye-
let immediately after thread trimming.
1-A) Check whether the needle thread re-
maining at the needle top after thread
trimming is short.
Refer to the cause of previous section “Needle
thread remaining at the needle top after thread trim-
ming is short”.
2-2) Needle thread slips off the needle eye-
let at the start of sewing.
2-A) Check whether the needle thread re-
maining at the needle top at the start of
sewing is short.
2-B) Hard-to-slip thread is used. Decrease the number of times of threading needle
thread.
3. Defective thread
trimming
3-1) Thread cannot be trimmed. 1-A) The blades of moving knife and counter
knife have been improperly adjusted.
Refer to “2.-(16)-6) Adjusting the knife pressure” and
“2.-(16)-1), 2) and 3) Position of the moving knife
and Position of the counter knife”.
1-B) The blades of moving knife and counter
knife have worn out or broken.
Replace the moving knife and counter knife with new
ones.
1-C) Pressure of the counter knife is insuffi -
cient.
Refer to “2.-(16)-6) Adjusting the knife pressure”.
1-D) Presser foot drops from cloth at the time
of thread trimming.
Perform thread trimming on cloth.
3-2) Thread remains uncut after thread trim-
ming.
2-A) The blades of moving knife and counter
knife have been improperly adjusted.
Refer to “2.-(16)-6) Adjusting the knife pressure” and
“2.-(16)-1), 2) and 3) Position of the moving knife
and Position of the counter knife”.
2-B) The blades of moving knife and counter
knife have worn out or broken.
Replace the moving knife and counter knife with new
ones.
2-C) Thread trimmer timing is excessively
retarded.
Refer to “2.-(16)-4) Thread trimmer cam timing”.
2-D) Pressure of the counter knife is insuffi -
cient.
Refer to “2.-(16)-6) Adjusting the knife pressure”.
2-E) Presser foot drops from cloth at the time
of thread trimming.
Perform thread trimming on cloth.
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