Brother International Innov-is 6750D Operation Manual for Premium Pack I Optio - Page 18
ADJUSTING THE THREAD TENSION, Adjusting the tension of the bobbin thread
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ENGLISH 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 a setting between 6 and 8 for the upper thread tension. If utility stitches are being used, refer to "Setting the Thread Tension" in chapter 2 of the machine's Operation Manual. If embroidery patterns are being used, refer to "Adjusting Thread Tension" in chapter 5 of the machine's Operation Manual. 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. ■ 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 Spring plate a Do not turn the phillips screw (+). b Adjust with a 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. 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 8.) 17