Clearance Between The Spreader And Looper And The Opening Timing Of The Spreader - JUKI MEB-3810N Series Instruction Manual

10-7. Clearance between the spreader and looper
and the opening timing of the spreader
WARNING :
1. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start
of the sewing machine.
2. To avoid unexpected personal injuries, be sure to keep away from the looper thread trimming
knife during work.
Loosen setscrew ❸ which fixed the looper. Then, adjust the clearance by changing the vertical position of the
looper.
● Clearance of left spreader ❶
Adjust so that clearance A of 0.1 to 0.2 mm is provided between the under surface of the top end of left
spreader ❶ and the top surface of the left looper and so that a resistance is applied to one thread when it
passes between them.
● Clearance of right spreader ❷
The allowable range of clearance B provided between the under surface of right spreader ❷ and the top
surface of right looper is 0 to 0.05 mm.
1. When the vertical position of the looper is adjusted, the clearance between the needle and the
looper has also to be adjusted simultaneously as described in
needle and the looper" p. 84.
2. If the clearance provided between the spreader and the looper is outside the adjustable range,
stitch skipping and needle breakage can occur.
Top end of the left
spreader juts out
❶
the left looper
Center of hole in the
Left looper
spreader and that of
the hole in the looper
are aligned.
❶
Left
looper
0 to 0.1mm
Right looper
Right
looper
❸ ❸
● Installation position of the left spreader
The center of the forked section at the top
of left spreader ❶ is aligned with the center
of the looper thread hole in the left looper.
When the top end of the left spread-
er in terms of the left looper pro-
trudes, stitch skipping will result.
● Installation position of the right spreader
❷
The internal surface of the right spreader
❷ is designed to be aligned with the inter-
nal surface of the spreader. Adjust the top
end of the spreader so that it retracts 0 to
0.1 mm from the inside of the right looper.
− 85 −
❷
"10-5. Clearance between the