3.2.5 Synchronous run of needle feed and bottom feed
The motion of the feeding shaft 3 is transmitted via block 2 and tie rod 5
to lever 6 and from there via tie rod 3 and lever 2 to needle bar wing 1.
Caution: Danger of injury !
Switch off main switch.
Check and adjust position of block 6 only when sewing machine is
switched off.
Standard checking
During the feed the needle must not move in the needle hole. At stitch
length “0" block 2 must be in perpendicular position.
–
Set stitch length “0”.
–
Check position of block 2.
Block 2 must be in parallel position to the cast edge of the casing.
–
Lock sewing feet in lifted position with lifting lever 8.
–
Set maximum stitch length.
–
Turn handwheel and check the synchronous feeding motion of
feed-dog and needle bar.
The adjustment is correct if the position of the needle in the needle
hole of the feed-dog does not change.
Correction
–
Loosen clamping screws 4 and 7.
–
Twist block 2 on feeding shaft 3.
–
Tighten clamping screws 4 and 7.
ATTENTION !
After twisting of block 2 it has to be checked that the needle
bar wing 1 is positioned in feed direction. Correct, if necessary
(see chapter Position of the needle bar wing in feed direction).
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7
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6
5
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4
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