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5-13. Adjusting the needle sidewise movement
<B850>
w
q
<B851>
w
q
q
5-14. Adjusting the change lever (the needle base position).
0563M
* Raise the needle above the material when adjusting the zigzag width. If the zigzag width is adjusted while the needle is
piercing the material, the needle may bend.
To change the reference line, loosen the thumb nut q and move the change lever w up or down.
r
w
e
r
Adjust so that the amount of needle deflection when the
1061S
needle goes into the needle plate hole is as small as pos-
sible.
1. Remove the head cover and the oil guard while mak-
2. Loosen the screws q (two for the B850, four for the
* Adjust so that the needle path describes a reversed "U"
Max. 0.5mm
1057S
Left
Right
reference
reference
line
line
Zigzag width
0564M
* For B850-1 (Narrow specifications)
Note:
If the needle position is set outside the center reference
line, turn the machine pulley by hand to check that the
needle does not touch the presser foot and the needle
plate before sewing.
To change the reference line, first loosen the two screws
e, and then move the two stoppers r of the change le-
ver w. Next loosen the thumb nut q and move the change
lever w up or down.
0646M
LZ2-B850,B851
ing this adjustment.
B851) and turn the upper shaft gear w to adjust.
shape when the machine pulley is turned.
q
w
5. ADJUSTMENTS
0562M
5-10
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