Brother International Innov-is 4750D Instruction Manual for Bobbin work - Page 8

When Tension is Applied to the Bobbin, Thread, When Tension is Not Applied to the Bobbin

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■ When Tension is Applied to the Bobbin Thread Insert bobbin into bobbin case so the thread unwinds from the left side. Then correctly pass the thread through the tension spring as shown below. ■ When Tension is Not Applied to the Bobbin Thread If the bobbin thread in the trial stitching is too tight and adjusting the bobbin case tension does not help (*As described in see "Adjusting the Tension of the Bobbin Thread" on page 11), do not pass the thread through the tension spring. Hold the bobbin with your left hand so the thread unwinds from the right side and hold the end of the thread with your right hand. a Tension spring CAUTION • When winding the bobbin, make sure the thread is not frayed. Sewing with frayed thread may result in the thread catching on the tension spring of the bobbin case, the thread becoming tangled or damage to the machine. • Do not guide the bobbin thread through the groove in the needle plate cover, otherwise the lower threading cannot be done correctly. k Pull out about 8 cm (approx. 3 inches) of bobbin thread. l Lightly hold the end of the upper thread while turning the handwheel toward you (counterclockwise) until the mark on the handwheel aligns with the center top of machine. 6

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6
■
When Tension is Applied to the Bobbin
Thread
Insert bobbin into bobbin case so the thread unwinds
from the left side.
Then correctly pass the thread through the tension
spring as shown below.
a
Tension spring
■
When Tension is Not Applied to the Bobbin
Thread
If the bobbin thread in the trial stitching is too tight and
adjusting the bobbin case tension does not help (*As
described in see “Adjusting the Tension of the Bobbin
Thread” on page 11), do not pass the thread through the
tension spring.
Hold the bobbin with your left hand so the thread
unwinds from the right side and hold the end of the
thread with your right hand.
k
Pull out about 8 cm (approx. 3 inches) of
bobbin thread.
l
Lightly hold the end of the upper thread while
turning the handwheel toward you
(counterclockwise) until the mark on the
handwheel aligns with the center top of
machine.
CAUTION
•
When winding the bobbin, make sure the thread is
not frayed. Sewing with frayed thread may result in
the thread catching on the tension spring of the
bobbin case, the thread becoming tangled or
damage to the machine.
•
Do not guide the bobbin thread through the groove
in the needle plate cover, otherwise the lower
threading cannot be done correctly.