Adjusting The Needle-To-Shuttle Relation - JUKI LK-1900BN Series Instruction Manual

7-2. Adjusting the needle-to-shuttle relation

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Relation between needle and engraved lines
❸
❶
❷
 

❹
0 mm
❺
0.05 to 0.1 mm
❹
7.5 mm

❾
❸
❶
❷
❹


❺
0 mm
❻

❼ ❽

1) Turn the handwheel by hand. When needle bar
❶ has gone up, adjust so that lower marker line
❷ engraved on the needle bar aligns with the
bottom end of the needle bar bushing ❸ , lower.
2) Loosen setscrew  in the driver. Open inner
hook pressers  to the right and left, and re-
move inner hook presser  .
At this time, be careful not to let inner
hook ❹ come off and fall.
3) Adjust so that the blade point of inner hook ❹ aligns
with the center of needle ❺ , and that a clearance
of 0 mm is provided between the front end of the
driver and the needle as the front end face of driver
❻ receives the needle to prevent the needle from
being bent. Then tighten setscrew  of the driver.
4) Loosen setscrew ❼ of the shuttle, and adjust
the longitudinal position of the shuttle. To do this
adjustment, turn shuttle race adjusting shaft ❽
clockwise or counterclockwise to provide a 0.05
to 0.1 mm clearance between needle ❺ and the
blade point of inner hook ❹ .
5) After adjusting the longitudinal position of the
shuttle, further adjust to provide a 7.5 mm clear-
ance between the needle and the shuttle by
adjusting the rotating direction. Then tighten set-
screw ❼ of the shuttle.
If the sewing machine is left unused for a
long time, or after clearing the area sur-
rounding the hook section, apply a little
quantity of oil to race section ❾ and felt 
before using the sewing machine.
－ －
50