Service manual

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Revised 03/2006
S-311
1-47
E - STANDARD MACHINE ADJUSTMENT
14. UPPER THREAD TRIMMING MECHANISM - AF/LTT
14.1.After installation of the holder with trimming knife Ê adjust the trimming knife after
loosening the screw Ì to obtain the clearance 0,1 — 0,15 mm above the right spreader Í.
14.2.Using the screw Ë adjust the trimming knife Ê so that the left side of the knife was
covered with the right side of the throat plate.
14.3.Position the tip of the trimming knife Ê 0.9 mm in front of the needle Ï by loosening
screw Î. Check the adjustment for keeping the clearance according to the point 14.2.
14.4.The normal home position of the trimming mechanism Ê is adjusted using screw Ð.
Correct adjustment prevents cutting of the looper thread Ñ (See diagram).
14.5.Adjust the initial position of the control lever Ò to the space 0,05 — 1 mm from stud Ó
by the screw after loosening its nut.
Ò
Looper position when cutting