Adjusting The Top Covering Thread Trimmer Mechanism (Ut42) - JUKI MF-7200D Series Instruction Manual

IX. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM (UT42)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❷
❶
❸
18 mm

❷
❾
Top covering thread
1. Adjusting the engagement of knife
❹
❽
❺
2. Adjusting the moving knife stroke



❻ , ❼
3. Adjusting the pressure of clamp spring
4. Adjusting the position of the blade
– 20 –
1) Adjust so that the engagement of fixed knife ❶
with moving knife ❷ is 0.5 mm.
2) When adjusting the engagement, loosen set-
screw ❹ and adjust lever ❽ .
1) Adjust so that the stroke of moving knife is 18
mm.
2) Loosen nut ❺ , adjust screw for the stopper  ,
and adjust the stroke of moving knife ❷ .
Perform the adjustment of the stroke of moving
knife after adjusting the engagement of the
knives.
1) Top covering thread is held with clamp spring ❸
after thread trimming.
2) Holding pressure can be adjusted by loosening
nut ❻ and turning screw ❼ .
3) Holding pressure is increased when tightening
screw ❼ and it is decreased when loosening
screw ❼ .
4) After the adjustment, tighten nut ❻ .
5) Make the holding pressure as low as possible
within the range of holding the top covering
thread.
point of moving knife
1) Bring the needle bar to its highest position.
2) When lever ❽ is lowered, moving knife ❷ lowers
together.
3) Adjust the moving knife to the position where the
hook section of moving knife ❷ enters the con-
cave of the bottom surface of spreader ❾ and
catches the top covering thread in the state that
moving knife ❷ is fully lowered. After the adjust-
ment, tighten screws   and  .
4) Screw  is for adjusting the lateral position of
knife, screw  for adjusting the angle of knife,
and screw  for adjusting the vertical position of
knife.
Make sure that the moving knife does not
interfere with other components such as
presser, needle, spreader, etc. within the
working range of moving knife ❷ .