Adjustment Of The Position For The Movable Knife Point; Adjustment Of The Blade Drive Arm Spring Force - Mitsubishi Electric PLK-G4030 Technical Manual

7-17.Adjustment of the position for the movable knife point

(1) Proceed as below to adjust the movable knife so that its end coincides with the front of the hook
retainer (No.2).
(2) Remove then slide plate, and open the cylinder cover.
(3) Check with the point (No.1) of the movable knife whether it is located at the position apart 0.5mm
from the front face of the hook retainer (No.2).
(4) For the adjustment of the movable knife point (No.1), loosen the adjusting screw nut (No.3,4) and
move the rod end (No.5) right and left then, adjust the position of the movable knife point.
(5) After the adjustment, tighten the adjusting screw nut (No.3,4) securely.
<1>:Movable knife <2>:Hook retainer <3>:Left screw nut <4>:Right screw nut <5>:Connecting rod

7-18.Adjustment of the blade drive arm spring force

(1) Remove the belt cover at the motor side
and detach the V-belt.
(2) Remove the screw of the oil pan at the
front. And slide the oil pan to front side.
(3) Turn the pulley by hand to needle down
position, Push the cam follower lever by
hand. And turn pulley again to low end
position of thread take-up lever with
pushing the cam follower lever.
(4) Release the cam follower lever and continue
to turn pulley.
(5) Now check whether the cam followeis
returned automatically.
If it is not returned, it is need to adjust as
follows.
(6) Loosen the nut (No.8) and turn the screw
(No.7) in the direction of the arrow, so that
force of the returning spring (No.6) becomes
strong.
(7) Fasten the nut (No.8) securely.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
<4>
<5>
<3>
<7>
<6>: Returning spring <7>: Screw <8>: Nut
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<2>
<1>
<8>
<6>