Adjusting The Needle-To-Hook Timing And The Needle Guard - JUKI IP-100A Engineer's Manual

(12) Adjusting the needle-to-hook timing and the needle guard

1. Hook adjusting mode
Hook adjusting mode setting screen <Straight stitch>
3
3
™ Lifting amount of the needle (bar) : 3.4 mm
(Adjust with engraved marker dot 2 of timing gauge E.)
™ When the zigzag width is maximized, a distance of 0.2
to 0.5 mm should be provided between the top end of
the needle eyelet and the blade point of the hook when
the needle reaches the leftmost end of the zigzag stroke.
0.2 to 0.5 mm
™ The needle guard :
• has to guard the needle both on the right- and left-hand
sides.
• A clearance of 0 to 0.05 mm should be provided between
the needle and the blade point of the hook (when the
needle reaches the rightmost end of the zigzag stroke).
Remarks Marker lines engraved on the face plate
™ The needle-to-hook timing is adjusted using timing gauge
E as described above. However, you can use the marker
lines engraved on the face plate for reference when
adjusting it.
™ Be sure to remember that the marker lines are used only
for reference. So, it is recommended to use the timing
gauge for adjusting the needle-to-hook relation so as to
make the most of many functions of the LZ-2290A Series
models of sewing machine.
Standard Adjustment
1
4
4
−
Information screen
Hook adjusting mode <Standard zigzag stitch>
5
5
E
Fit the blade point of the
hook onto the indented
part of the needle.
(Approximately 0.05 mm)
Blade point
of the hook
24
−
2
6 7
6 7
Woodruff plate
Fig. 1
Fig. 2
0 to 0.05 mm
Needle
Needle guard
Fig. 3