7-12-2.3 Connection Of The Knife Bracket And The Driving Crank; 7-12-2.4 Adjustment Of The Component Parts Of The Knife Driving Mechanism - JUKI PLK-G4030R Technical Manual

7-12-2.3 Connection of the knife bracket and the driving crank

(1) Connect the knife bracket (No.1) and the driving crank (No.2) with the link (No.3).
(2) Loosen the driving crank set screw (No.4) and adjust the attaching position of the driving crank (No.2)
in the right and left direction so that the link (No.3) can contact with the same flat surface of the knife
bracket (No.1) and the driving crank (No.2) without any distortion. After the adjustment, tighten the
driving crank set screw (No.4) securely.
<4>

7-12-2.4 Adjustment of the component parts of the knife driving mechanism

(1) Attach the component parts of the knife driving mechanism and adjust the locations as shown on the
figure.
(2) Fix the knife driving shaft (No.1) with the set collar (No.2). At the time, make sure there is no play on
the knife driving shaft (No.1) in the axial direction and it can be rotated smoothly. On the other hand,
make sure the set screw (No.3) not to interference with machine bed when rotated the knife driving
shaft (No.1) about 90 degree in the direction of the arrow.
(3) Fix the cam follower crank 1 (No.4) on the knife driving shaft (No.1) at the right end position 77mm
away from the front surface of the sewing machine bed as shown on the figure.
(4) Fix the stopper (No.5) on the knife driving shaft (No.1) by tightening the set screw (No.11) at the flat
cut of the shaft.
<6>
<1>: Knife driving shaft <2>: Set collar <3>: Set screw <4>: Cam follower crank 1 <5>: Stopper
<6>: Driving crank <7>: Set screw <8>:Adjusting bolt <9>: Cam follower crank 2 <10>: Spring
<11>: Set screw
<1>
<3>
<2>
77mm
<10>
<2> <3>
<1>: Knife bracket
<2>: driving crank
<3>: Link
<4>: Set screw
<8>
<4>
<9>
<7>
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<5>
<11>
<1>