JUKI MEB-3810N Series Instruction Manual page 83

To adjust the timing between the needle and the looper, adjust the needle throwing width and check
the needle bar height in advance.
The inside needle means the innermost needle entry and the outside needle means the outermost
needle entry of the needle throwing width employed for sewing an eyelet buttonhole.
1)
❻
2)
Needle (lower dead point of inside needle)
A=B
Needle (lower dead point of outside needle)
❸
❸
45°
A
B
❹
❺
❻
1) Loosen two setscrew ❻ in the looper driving cam.
Bring the needle bar to the lower dead point of the
inside needle. Turn looper driving cam ❸ by hand
so that the flat plane of looper driving cam ❸ faces
to the lower left at 45° to horizontal, and temporarily
tighten looper driving cam setscrew ❻.
When turning looper driving cam ❸, take
care not to allow the hook driving shaft to
turn together.
2) Loosen setscrew ❺ in the looper driving shaft guide.
Move looper driving shaft guide ❹ up and down to
adjust so that clearance B provided between the
needle and the right looper and clearance A be-
tween the needle and the left looper are made to be
equal in both cases when the needle bar is brought
to the lower dead point of the outside needle and
when the needle bar is brought to the lower dead
point of the inside needle. Then, tighten setscrew
❺.
Take care not to damage or deform needle
thread trimming spring ❻.
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