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Adjustment Procedures
1) Move moving knife 2 forward until it will go no further (by
approximately 39 mm) and confirm that the end of slide plate
3 is spaced 34 ± 0.5 mm from the top of the moving knife 2.
2) Adjust the opersting pressure of counter knife 1 and moving
knife 2 by tightening screw 5 in clamp plate 4 .
3) At this time, the force to move moving knife pin 6 in the direction
of the arrow is more or less than 600 gf.
4) If screw 5 is excessively loose, defective thread trimming may
occur.
™ When the moving knife is properly positioned :
Needle thread on
the material side
Needle eyelet
Needle thread on
the needle side
Adjustment Procedures
1) Loosen nut 3 in the knife driving arm 7 , and adjust the initial
position of the moving knife.
Loosen/tighten nut 3 after roller 4 has fitted in the groove on
the thread trimming cam 8 by pressing roller arm 6 with
fingers. This will prevent knife driving arm 7 from moving out
of position thereby allowing you to perform the adjustment in
safety.
2) After adjusting the initial position of the moving knife, turn the
handwheel in the state that roller 4 has fitted in the groove on
the thread trimming cam 8, and check that the latch has
securely entered when the moving knife moves forward or
backward until it will go no further. (You can hear "click" when
the latch has entered.)
(Caution) When a feed dog other than that which is delivered
as standard is used, there is a case where the feed dog
interferes with counter knife according to its shape. In case
of interference, move the feed dog to the left side from the
engraved dot and check that there is no interference with
each other.
Knife base
1
Bobbin
thread
3
4
−
Results of Improper Adjustment
™ When the moving knife is positioned in the front :
1) In the case where the needle
thread is trimmed twice :
™ When the moving knife is positioned in the rear :
2) In the case where the needle
thread is not trimmed :
How to solve the aforementioned troubles
1) In the case where the needle
2
thread is trimmed twice :
Slightly loosen screws 1 to 4, and
B
slant the knife base in the direction A.
Then tighten screws 1 to 4.
2) In the case where the thread is not
trimmed :
Slightly loosen screws 1 to 4, and
A
slant the knife base in the direction B.
Then tighten screws 1 to 4.
Results of Improper Adjustment
™ If the initial position of the moving
knife is not properly adjusted, the
moving knife will fail to cut the
thread or cut the thread at a
wrong position reducing the
length of remaining thread after
thread trimming.
37
−
Needle eyelet
Needle eyelet
1
2
3
4
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