13-3 Disassembling/reassembling the upper knives
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To disassemble the upper knives
1.
Loosen screws B.
Move upper knife joint bracket I to the left so
that the spring can be released.
2.
Loosen screws N. Remove upper knives O and
P by moving them up.
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To reassemble the upper knives
1.
Insert the upper knives to the proper depth
along the guides on upper knife brackets Q and
R. Then tighten screws N.
2.
Move upper joint bracket I to the right to press
spring J. Then tighten screws B while
pressing them to the flat spot.
13-4 Overlap of the upper and lower knives
When upper knives O and P are at the bottom of
their stroke, there should be a clearance of 0.5mm
between the points of the cutting edges of the upper
knives and those of the lower knives.
Adjustment is made by loosening screw T on upper
knife drive lever S.
13-5 Resharpening the lower knives
Resharpen the lower knives when they become dull.
It is recommended spare upper and lower knives
are always kept for replacement.
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14
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CLEANING THE MACHINE
At the end of each day, remove the presser foot
and the needle plate and then clean the slots of
the needle plate and the area around the feed
dogs.
