3.3 Needle bar wing
Preconditions for the positioning of the needle bar
–
Position of feed-dog in the throat plate cutout is adjusted correctly
(see chapter 3.2.1).
–
Synchronous run of needle feed and bottom feed is adjusted
correctly (see chapter 3.2.5).
3.3.1 Lateral position of the needle bar w ing
Caution: Danger of injury !
Switch off main switch.
Check and adjust lateral position of the needle bar wing only when
sewing machine is switched off.
Standard checking
At stitch length “0" the needle must stick in the c entre of the needle
hole of the feed-dog.
–
Set stitch length “0”.
–
Move needle in position “down” by handwheel.
–
Check position of the needle in the needle hole of the feed-dog.
Correction
–
Screw off arm cover.
–
Loosen clamping screws 8 at both c lamping blocks 10.
–
Loosen both clamping screws 7 and core pin 11 at the needle bar
crank 12.
–
Loosen core pins 4 and 6.
–
Loosen screw 13 at lever 14.
–
Position needle bar wing 9 laterally.
The needle must s tick in the c entre of the needle hole of the
feed-dog.
–
If necessary, shift the s haft for the sewing foot drive axially.
Loosen clamping screws 1 and 2 at the setting rings and clamping
screw 3 at the block.
Shift the shaft axially.
Tighten clamping screws 1,2 and 3 again afterwards.
–
Tighten all screws which had been loosened.
Please observe the following:
- Needle bar wing 9 must be fixed axially.
- Both clamping blocks 10 must be in horizontal position.
- Core pin 11 must be on the surface of the crank pin.
- Lever 15 must be in perpendicular position.
- The oil wicks must be in correct position.
- The lateral clearance of the thread lever control 5 must be
adjusted as low as possible.
- The stroke heights of both sewing feet must be identical.
ATTENTION
After the lateral positioning of the needle bar wing:
–
Check distance between hook and needle and correct, if
necessary (see chapter Hook settings).
13
GB
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