HIGHLEAD GC20618 Series, Instruction Manual Parts Catalog

Page: 11 / 54

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8
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8
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Tension adjustment
9.
Balance of thread tension
of bobbin threads
10
．
Needle thread tension
·
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.
11
．
Adjustment of presser foot pressure
Pressure to fabric(s) can be adjusted by turning the
pressure adjusting screw.
12
．
Timing between rotating hook motion and
needle motion
(1) Set feed length (stitch length) to “6” 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
2.3mm 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 0.0.5mm.