Adjusting The Needle Thread Trimmer - JUKI LBH-1790 Instruction Manual

2. Adjusting the needle thread trimmer
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
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2
3
1
(1) Adjusting the thread grasping force of the
needle thread trimmer
If the needle thread trmmer fals to provde conss-
tent thread graspng force, the needle thread can
slp off at the begnnng of sewng.
) If the thread graspng force of the needle thread
trmmer has reduced, loosen setscrews 1 and
detach needle thread trmmer 2 .
2) Slghtly bend the top end of thread presser
sprng 3 so that t comes n contact wth thread
trmmng blade of upper knfe 4 over the length
wth no clearance and so that the needle thread
trmmer securely holds the thread regardless
of the poston of the thread trmmng blade at
whch the thread s trmmed.
4
(2) Adjusting the height of the needle thread
trimmer
To adjust the heght of the needle thread trmmer,
loosen setscrew 1 . Set the heght of trmmer as low
as possble, provded that t does not touch work
clamp check, n order to mnmze the length of re-
manng thread on the needle after trmmng.
Note that the work clamp check tlts when sewng
a mult-layered porton of the materal, attach the
needle thread trmmer to slghtly rase the nstallng
poston of the trmmer.
– 48 –
When replacing the needle thread trim-
mer, make sure that the trimmer nor-
mally works under the needle thread
trimmer adjusting mode (memory switch
level 2 : K51).