Standard Adjustment; Height Of The Needle Bar; Needle-To-Hook Timing - JUKI lbh-1790 series Engineer's Manual

3. STANDARD ADJUSTMENT

(1) Height of the needle bar

Adjust the height of the needle bar so that the distance from the top surface of the throat plate to the
lower end face of the needle bar is 12.0 mm (S : standard) or 11.3 mm (K : knit) when the needle bar
is in the lowest dead point.

(2) Needle-to-hook timing

1) Blade point of the hook is aligned with the center of the needle when the
needle bar goes up by 2.5 mm (S : standard) or by 3.0 mm (K : knit) from
its lowest dead point.
At this time, the distance from the top end of the needle eyelet to the
blade point of the hook is 1.6 to 1.8 mm (needle is in the central section of
the hole in the throat plate).
2) The clearance provided between the needle and the blade point of the
hook is 0.01 to 0.04 mm (when the needle is rocked to the right of the
hole in the throat plate)
3) Adjustment value of the needle guard is 0 to 0.02 mm (needle is in the
central section of the hole in the throat plate).
1.6 to 1.8 mm
Standard Adjustment
2
1
Standard Adjustment
1
0.01 to 0.04 mm
Blade point
of hook
0 to 0.02 mm
Needle guard
3
5
Loop guide section
3
− −
Needle
2
0 to 0.02 mm
4
Inner hook presser
Blade point
Rear plate
(Needle guard section)