Adjustment Of The Thread Tension; Adjustment Of Upper Thread Tension - Mitsubishi Electric PLK-J4040R Technical Manual

5-9. Adjustment of the thread tension

(1) Adjust the bobbin thread tension with the thread tension adjusting screw (No.2) on the bobbin case
(No.1). The thread tension become 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.
<1>

5-10. Adjustment of upper thread tension

Adjust the upper thread tension corresponding to the bobbin thread tension. The upper thread tension
becomes tight when tightening the thread tension adjusting nut (No.1) clockwise, and the upper thread
tension becomes loose when loosening the thread tension adjusting nut counterclockwise.
NOTE It is possible to adjust the upper thread tension automatically. Please refer to the instructions
OPERATION PANEL technical manual concerning about [Digital tension].
<2>
<1>
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<1>: Bobbin case
<2>: Adjusting screw
<1>: Thread tension adjusting nut