Adjustment Of The Holding Pressure Of The Bobbin Thread - Mitsubishi Electric PLK-J6040R3 Technical Manual

7-6-3. Adjustment of the holding pressure of the bobbin thread

(1) Loosen the set screw (No.2) for clamping the adjuster (No.1).
(2) When the adjuster (No.1) part of (A) is moved upward, the holding pressure becomes weak. On the
other hand, when the adjuster (No.1) part of (A) is moved downward, the holding pressure becomes
strong.
(3) Set the adjuster (No.1) to the position where it can be gotten an adequate holding pressure of the
bobbin thread. At this time, the holder (No.3) should be located in directly below the leaf spring (No.4).
(4) Tighten the set screw (No.2).
NOTE To prevent the stitch forming miss when start sewing, do not adjust the holding pressure too much.
<2>
Loose
<1>: Adjuster <2>: Set screw <3>: Holder <4>: Leaf spring
<4>
<1>
Tight
<A>
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<3>