5-21
[Fig.5-32]
[Fig.5-33]
Back groove
Needle eye
Front groove
[CAUTION]
Functions by Needle Shape
① Size of the hole and groove differs by needle.
• Front groove: protects the thread from the heat of the
sewing friction (which may cause thread breaks).
• Back groove: helps regulate the hook timing and
prevents looping.
Prevention of looping is important for stitching. Adjust the hook point as close to the needle as possible to achieve
the perfect thread position.
② If thread breaks or stitches are unstable, turn the needle slightly
to the right.
[NOTE]
Shape of the loop varies by the type of thread or fabric. Unstable shape of the loop may result in skipped
stitches. The following pictures show different shapes of loop formed by different types of thread.
Hook point
Cotton thread loop
Synthetic thread loop
Hook point
[Fig.5-34]
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