JUKI LU-1510N Engineer's Manual page 33

Adjustment Procedures
1. Loosen two setscrews 2 in the needle bar rocking frame shaft
attached to needle bar rocking frame 1.
2. Pushing the needle bar rocking frame base shaft in the direction
of the arrow mark, turn the needle bar rocking frame to the left
or right, and the needle bar rocking frame moves up or down.
™ Turn to the left : The needle bar rocking frame goes up,
and clearance "a" becomes smaller and
clearance "c" becomes larger.
™ Turn to the right : The needle bar rocking frame comes
down, and clearance "a" becomes larger
and clearance "c" becomes smaller.
(Range of adjustment is until the slot of the needle bar rocking
frame shaft becomes perpendicular.)
3. After the adjustment, tighten two setscrews 2 in the needle
bar rocking frame shaft and fix the needle bar rocking frame
shaft.
Respective clearances of the vertical position of the needle
bar
™ a : Clearance between the needle bar rocking frame and
the half ring
(When the needle bar connection is at the highest dead
point.)
™ b : Clearance between the needle bar fixing shaft and the
needle bar connection
(When the needle bar connection is at the highest dead
point.)
™ c : Clearance between the needle stop push rod and the
needle stop ball slide shaft
(It is nothing to do with the position of the needle bar
connection.)
™ d : Clearance between the bottom face of the needle bar
connection and the top surface of the needle bar rear
metal
(When the needle bar connection is at the lowest dead
point.)
(Caution) Clearance "b" is "0" when needle stop is simply
performed. However, it is the clearance which is made when
the needle bar is further pushed up from the lower side.
Results of Improper Adjustment
™ Trouble of the organized split
needle bar occurs.
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