Adjustment Of The Thread Tension - Mitsubishi PLK-E2010R Instruction Manual

6-3 Adjustment of the thread tension

The thread tension between the upper and bottom thread should be balanced in the best condition.
When the upper thread tension is well balanced with bobbin thread tension, both threads are interlocked
along the centerline of fabric layers as shown in the below figures.
NOTE Normally weaker bobbin thread tension brings better sewing quality.
So it is prefer to set bobbin thread tension first and then set upper thread tension.
Well balanced
tension
1) Bobbin thread tension
Adjust the bobbin thread tension with the thread tension adjusting screw (No.2) on the bobbin case
(No.1). The thread tension becomes loose if turn the thread tension adjusting screw (No.2) to the
counterclockwise, and the thread tension becomes tight if turn it to the clockwise.
2) Upper thread tension
Adjust the upper thread tension based on the bobbin thread tension.
For this adjustment, turn the thread tension adjusting nut (No.3). The upper thread tension becomes
tight if turn the thread tension adjusting nut (No.3) to the clockwise, and the upper thread tension
becomes loose if turns it to the counterclockwise.
1)
The upper thread is tight or
the bobbin thread is loose
2)
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The upper thread is loose
or the bobbin thread is tight
3)