3.2.4 Feeding motion of the feed-dog
Caution: Danger of injury !
Switch off main switch.
Check and adjust feeding motion of the feed-dog only when sewing
machine is switched off.
Standard checking
When actuating the stitch regulator shaft with the max. stitch
length, the needle should not move when reaching its bottom
dead center or 0.7 mm before.
–
Set maximum stitch length.
–
Tu rn handwheel until the needle reaches its bottom dead center or
is 0.7 mm above its bottom dead center.
–
Tu rn the stitch regulator shaft and observe the needle.
Correction
–
Loosen two screws 1.
–
Set eccentric 2.
–
The needle must not move 0.5 mm after the bottom dead centre.
Position eccentric 2 axially.
The tie rod 3 s hould be central to the running surface of the
eccentric.
–
Tighten two screws 1 again.
Hint
In order to obtain a constant loop stroke for forward and backward
sewing, the needle bar should not move any longer for the first 2 mm
loop stroke setting.
However the needle would still continue oscillating with the needle
stitching the material, w hile the cloth preser foot still holds the material.
This can lead to needle breakage.
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