Needle Thread Tension; Adjustment Of Presser Foot Pressure; Timing Between Rotating Hook Motion And Needle Motion; Adjustment Of Feed Dog Height - HIGHLEAD GC24698-1L Instruction Manual

7. Needle thread tension (Fig. ll)
Needle thread tension should be adjusted in reference
to bobbin thread tension.
To adjust needle thread tension, turn each tension
adjusting nut. Needle thread tension can be also adjusted
for special fabric and thread by changing intensity and
movable range of slack thread adjusting spring.
8. Adjustment of presser foot pressure
(Fig.12)
Pressure to fabric(s) can be adjusted by turning the
pressure adjusting screw.
12 ]
Gap bt1w11n hook poinl and upp1< odga of needle oye
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p
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n11dl1lcwar
d•a~ point
Center of
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9. Timing between rotating hook motion and needle motion (Fig.13)
l) Set feed length (stitch length) to "G" on the feed setting dial.
2) When needle is lifted 2.4mm from the lower dead point, as shown in Figure, the following positional
relationship should be maintained.
The upper edge of needle eye should be 2.3111111 below the hook point.
The hook point should be located at the center of needle axis.
Gap between the hook point and the side face of needle should be 0. 05mm.
10. Adjustment of feed dog height (Fig.14)
Height of feed dog and pressure of presser Foot should be adjusted for individual fabric(s) with the following
cautions:
Fa bric will be damaged if the feed dog extends too high, or pressure of presser foot is too large.
Even stitch length cannot be assured
if
the feed dog is too low or pressure of
presser foot is too small.
Feed dog height should be measured
at the point where the needle is at the top
position.
For light fabric: Approx 0.8mm
For usual fabric: Approx l .Onun
For heavy fabric: Approx l .2mm
I
\
w~m
l
0.8mm
~ml
1.0mm
1~'"1
1.2mm
14
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15