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Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
1. Set the stitch dial to “0”.
2. Turn the handwheel to bring the needle bar to the lowest dead
point of its stroke.
3. Loosen clamping screw 3 in the feed rocker.
4. Move the feed base 4 and adjust so that needle 1 enters the
center of the needle hole in feed dog 2. Then securely tighten
clamping screw 3 in the feed rocker. (a = a')
In addition, adjust the lateral clearances of feed dog 2 in terms
of the window of throat plate to almost equal values. (A = B
and C = D)
When the height of the feed dog is
higher than the specified value :
™ Stitch pitch becomes larger than
the scale of the feed dial.
™ Balloon stitches will result.
™ Return of sewing product will
occur.
™ Feed dog comes in contact with
the knife, and the knife and the
feed dog may be damaged.
When the height of the feed dog is
lower than the specified value :
™ Stitch pitch becomes smaller
than the scale of the feed dial.
™ Feed force will be deteriorated.
™ Stitch skipping or thread
breakage will result.
™ Poorly tensed stitches will result.
™ Needle breakage will result.
1. Set the stitch dial to “0”.
2. Turn the handwheel to bring the height of the feed dog to the
maximum.
(Bring the needle bar to the lowest dead point of its stroke.)
3. Loosen setscrew 1 in the feed bar slide fork, move feed bar
slide fork 2 up or dowm and adjust feed dog 3 from top surface
4 of the throat plate (center section) to the dimension A. Then
securely tighten setscrew 1 in the feed bar slide fork.
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