Brother Bobbin work kit for Innov-is 4000D - Manual (Page 14)

13
ADJUSTING THE THREAD TENSION
After sewing trial stitches and checking the sewing results, adjust the thread tensions if necessary. After adjusting the
tensions, be sure to sew trial stitches again in order to check the sewing results.
Adjusting the Upper Thread Tension
We recommend an upper thread tension that is higher
than the standard setting.
Refer to the machine’s Operation Manual for detailed
instruction.
Adjusting the Tension of the Bobbin
Thread
If the desired stitching cannot be achieved after
adjusting the upper thread tension, adjust the tension of
the bobbin thread. The tension of the bobbin thread can
be adjusted by turning the slotted-head (–) screw on the
bobbin case (gray) for bobbin work.
a Do not turn the phillips screw (+).
b Adjust with the small screwdriver.
To increase the tension of the bobbin thread, turn the
slotted-head (–) screw 30° to 45° clockwise.
To decrease the tension of the bobbin thread, turn the
slotted-head (–) screw 30° to 45° counterclockwise.
Note
• Turning the screw on the bobbin case (gray) may
push up the spring plate, as shown below.
If this occurs, gently press down the spring plate
with a screwdriver so it is lower than the top surface
of the bobbin case (gray), and then insert the bobbin
case into the machine.
a Spring plate
CAUTION
• DO NOT adjust the position of the phillips (+)
screw on the bobbin case (gray) as this may result in
damage to the bobbin case, rendering it useless.
• If the slotted screw (-) is difficult to turn, do not use
force. Turning the screw too much or providing
force in either (rotational) direction may cause
damage to the bobbin case. Should damage occur,
the bobbin case may not maintain proper tension.
Note
• If the bobbin thread tension is tight, the thread
cannot be passed through the tension spring when
the bobbin is installed in the bobbin case. (Refer to
“When tension is not applied to the bobbin thread”
on page 6.)