- 18 -
(No.3) moves back and forth. Adjust the clearance between the needle (No.4) and the driver (No.5) to
be zero.
7-5. Adjustment of
the shuttle race thread guide
(1) Remove the ring-E type (No.3) which is engaging the movable knife (No.2) and the trimmer link
(No.1).
(2) Loosen the set screw (No.4) and remove the sliding plate (No.5) so that the shuttle race thread guide
(No.6) shown on the figure appears.
(3) Loosen the set screws (No.10) to match the hole in the shuttle race thread guide (No.6) with the
needle bar center line so that the shoulder (No.9) of the shuttle race thread guide matches with the
rear side line (No.8) of the needle. At this time, make sure that there is a clearance between the hook
retainer and the shuttle race thread guide (No.6) at least the thread can be passed through. (The
standard clearance is 0.8mm.) The wide clearance causes the trimming failure.
(4) After the adjustment, assemble the place with the reverse procedure. Make sure to set the sliding
plate (No.5) at this time so that the needle (No.11) comes down to the center of the needle hole
(No.12) of the needle plate.
<4>
0.8mm
<5>
<2>
<1>
<3>
<11>
<12>
<13>
<6>
<8>
<7>
<10>
<9>
<1>
<2>
<3>
<5>
<4>
0mm
<1>: Lower shaft bushing screw
(two screws)
<2>: Eccentric pin
<3>: Lower shaft
<4>: Needle
<5>: Driver
<1>: Trimmer link
<2>: Movable knife
<3>: Ring-E type
<4>: Set screw
<5>: Sliding plate
<6>: Shuttle race thread guide
<7>: Hole of shuttle race thread
guide
<8>: Needle bar center line
<9>: Shoulder
<10>: Set screw
<11>: Needle
<12>: Needle hole
<13>: Shuttle hook retainer