JUKI MOL-254 Engineer's Manual page 25

Adjustment Procedures Results of Improper Adjustment
Loosen nuts and to adjust the thread trimming cylinder. If the clearance is smaller than 1
mm, moving knife locating in the
sewing position will excessively
protrude from the throat plate. This
causes the moving knife to interfere
with the moving knife on the
opposite side when making the
distance between this side seam
and far side seam smaller.
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