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35
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Throat plate
❷
Rear movable needle guard
❸
Front needle guard
* Check that the clearance between the needle and the front needle
guard and that between the needle and the rear movable needle
guard are 0.05 to 0.2 mm (A) and 0 to 0.1 mm (E).
How to perform adjustment:
○
If the knife driving rod (D) is in its lower position (as shown in the
gure), operate the knife changeover lever to lower the knife.
○
Set the needle bar in its lowest position of the stroke.
○
Loosen the setscrews (B) of the rear movable needle guard
❷
.
○
Move the rear needle guard
❷
to make adjustment.
○
Retighten the setscrews (B).
○
Loosen the setscrews (C) of the front needle guard
❸
.
○
Move the front needle guard
❸
to make adjustment.
○
Retighten the setscrews (C).
○
Clearance between front needle
guard
❸
and the needle:
・
If this clearance is larger than the
standard adjustment value.... The
looper blade point and the needle
come in contact with each other,
resulting in needle breakage and
blade point breakage.
・
If this clearance is smaller than
the standard adjustment .... Nee-
dle bending and stitch skipping
can be caused.
○
Clearance between rear movable
needle guard
❷
and the needle:
・
If this clearance is larger than
the standard adjustment value....
The needle can sway resulting in
stitch skipping.
・
If this clearance is smaller than
the standard adjustment .... The
needle can be caught between
the both needle guards to cause
the needle guards to wear out
and to be damaged by the nee-
dle.
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