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13
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ADJUSTING THE BK FRONT KNIFE DEVICE
13-1 Adjusting the clearance between the left and right knives
Clearance A should be divided into half by the center line of the needle bar.
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To make the above adjustment
1.
Loosen the upper (left and right) knives by loosening screws B and C.
2.
To adjust the clearance between the lower left and right knives, loosen screws D and
E.
3.
Fit lower knife (left and right) holders F and G onto guide plates H.
Tighten screws D and E.
4.
Fit upper knife (right) P onto the lower knife (right). Then tighten screw C.
5.
Fit upper knife (left) O onto the lower knife (left). Move upper joint bracket I to the
right to press spring J. Then tighten screws B while pressing them to the flat spot.
13-2 Disassembling/reassembling the lower knives
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To disassemble the lower knives
1.
Loosen screws B.
Move upper knife joint bracket I to the left so
that the spring can be released.
2.
Remove the lower knives by removing screws
K.
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To reassemble the lower knives
1.
Install lower knives L on knife holder F or G
with the point of each cutting edge turned
outside.
2.
Adjust lower knives L so that each cutting edge
of lower knives L is flush with the top surface of
auxiliary feed dog plate. Then tighten screws
K.
3.
Move upper joint bracket I to the right to press
spring J. Then tighten screws B while
pressing them to the flat spot.
13
