JUKI LBH-1700, Engineer'S Manual

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3
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Adjustment Procedures Results of Improper Adjustment
0 to 0.2 mm
1. Enter timing gauge
1
supplied with the machine as
accessories between the throat plate and the lower end of
the needle bar as shown in the figure, loosen the setscrew in
the needle bar connection, and adjust the height of the needle
bar.
(Caution) Adjust the height of the needle bar when the
needle is positioned in the center of the needle
hole in the throat plate.
2. Table of timing gauge
Part No. of timing gauge : B9101771000 (Standard)
D9101771K00 (K)
1. Make a state that the needle is in the center of the hole in the
throat plate and the needle bar starts going up from the lowest
dead point. Then, enter the timing gauge 2 between the throat
plate and the lower end of the needle bar as shown in the
figure and loosen the hook sleeve setscrew to adjust the
timing.
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. In this state, adjust the relation of the position of the inner
hook and the bobbin case positioning stopper to 0 to 0.2 mm
as shown in the figure below. Then, securely tighten with the
stopper setscrew.
Bobbin case positioning
stopper
Sub-class
type
Timing gauge
1 2
Standard 11.9 mm 14.2 mm
K 11.4 mm 14.2 mm
Inner hook
™ For the floppy fabrics, it is effective
when the needle bar is slightly
lowered than the standard value.
™ For the floppy fabrics, it is effective
when the hook timing is slightly
retarded than the standard value.
(Clrarance provided between the
upper end of the needle eyelet and
the blade point of the hook is
desired to be approximately 1.0
mm.)
™ For the purl stitching, if the hook
timing is advanced, crest of seam
is likely to be improved. On the
contrary, if the hook timing is
r e t a r d e d , s t i t c h s k i p p i n g i s
improved, but crest of seam is likely
to be slightly deteriorated.