Height Of The Needle Bar; Adjusting The Needle Bar Height; Reference Height Of The Needle Bar - JUKI MEB-3810N Series Instruction Manual

10-3. Height of the needle bar

(1) Adjusting the needle bar height

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.
❶
Loosen screw ❶ and adjust the height of the needle bar so that the top of the needle eyelet is spaced 2.5 mm
from the blade point of the looper when the needle bar ascends 3 mm from its inside lower dead point and the
needle and left looper are positioned at the inside needle scooping position.

(2) Reference height of the needle bar

❶
❶
A
❷
For the needle bar height, take dimension A from the
top end of the needle bar ❷ to the top surface of nee-
dle bar cover ❶ shown in the left figure as reference.
Dimension A at each point
Lower dead point of needle bar... 42.5 mm
(when the looper timing is 3 mm)
Looper scooping timing ... 39.5 mm
(when the looper timing is 3 mm)
Carry out the adjustment after the com-
pletion of adjustment described in
Timing between the needle and the looper"
p. 79.
− 82 −
"10-2.