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lithe blades are blunt, they will cause the material to pucker and uneven stitches.
*
f one strand of thread can be cut off in front of or of the rear of the blade, the
blade is sharp enough.
*When the blades are blunt, replace them with new ones in the manner men
tioned below. But he sure to unplug the power cord before doing so.
Replacing the upper blade
(1) To remove, loosen the up
per blade set screw and
pull up the upper blade.
(2) Insert the new upper blade
into the upper blade holder.
(3) Then turn the pulley by
hand until the upper blade
is right down. Check that
the upper blade is in front
of the lower one and adjust
the clearance between it and
the edge of the lower blade
i.e. from 0.5 mm to 1.0
mm.
(4) Retighten the upper blade
securely.
(1) Loosen the lower blade set screw and pull down the lower blade.
(2) Insert the new lower blade into the lower blade holder.
(3) Position the lower blade so that its edge is flush with the needle plate.
(4) Tighten the lower blade set screws.
*It is important to adjust the alignment of the upper and lower blades for
sharp cutting.
Replacing the lower blade
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