JUKI LU-2810 Series Engineer's Manual page 78

海外講習会用121122 LU-2810(-7)_EM
WARNING :
Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble
2. Thread slips off the 2-1) Needle thread slips off the needle eye-
needle eyelet.
2-2) Needle thread slips off the needle eye-
3. Defective thread trim- 3-1) Thread cannot be trimmed.
ming
3-2) Thread remains uncut after thread trim-
To the next page
Cause
let immediately after thread trimming.
let at the start of sewing.
ming.
Checking
1-A) Check whether the needle thread re-
maining at the needle top after thread
trimming is short.
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.
1-A) The blades of moving knife and counter
knife have been improperly adjusted.
1-B) The blades of moving knife and counter
knife have worn out or broken.
1-C) Pressure of the counter knife is insuffi-
cient.
1-D) Presser foot drops from cloth at the time
of thread trimming.
2-A) The blades of moving knife and counter
knife have been improperly adjusted.
2-B) The blades of moving knife and counter
knife have worn out or broken.
2-C) Thread trimmer timing is excessively
retarded.
2-D) Pressure of the counter knife is insuffi-
cient.
2-E) Presser foot drops from cloth at the time
of thread trimming.
Corrective measures
Refer to the cause of previous section "Needle thread
remaining at the needle top after thread trimming is
short".
Decrease the number of times of threading needle
thread.
Refer to "2.-(17)-4) Adjusting the knife pressure" and
"2.-(17)-1), 2) and 3) Position of the moving knife and
Position of the counter knife".
Replace the moving knife and counter knife with new
ones.
Refer to "2.-(17)-4) Adjusting the knife pressure".
Perform thread trimming on cloth.
Refer to "2.-(17)-4) Adjusting the knife pressure" and
"2.-(17)-1), 2) and 3) Position of the moving knife and
Position of the counter knife".
Replace the moving knife and counter knife with new
ones.
Refer to "2.-(17)-6) Thread trimmer cam timing".
Refer to "2.-(17)-4) Adjusting the knife pressure".
Perform thread trimming on cloth.