Adjusting The Needle Thread Trimmer - JUKI LBH-1790A Series 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.
❶
❷
❸
❶
(1) Adjusting the thread grasping force of the
needle thread trimmer
If the needle thread trimmer fails to provide consis-
tent thread grasping force, the needle thread can slip
off at the beginning of sewing.
1) If the thread grasping force of the needle thread
trimmer has reduced, loosen setscrews ❶ and
detach needle thread trimmer ❷ .
2) Slightly bend the top end of thread presser
spring ❸ so that it comes in contact with thread
trimming blade of upper knife ❹ over the length
with no clearance and so that the needle thread
trimmer securely holds the thread regardless of
the position of the thread trimming blade at which
the thread is trimmed.
❹
(2) Adjusting the height of the needle thread
trimmer
To adjust the height of the needle thread trimmer,
loosen setscrew ❶ . Set the height of trimmer as
low as possible, provided that it does not touch work
clamp check, in order to minimize the length of re-
maining thread on the needle after trimming.
Note that the work clamp check tilts when sewing
a multi-layered portion of the material, attach the
needle thread trimmer to slightly raise the installing
position of the trimmer.
– 62 –
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 : K051).