Adjustment
11 - 11
-058
2
1
11
.04.10
Position of the looper in the direction of sewing/re-adjusting the looper eccentric
Requirement
When the needle bar is positioned
6.0 mm after b.d.c.
and the stitch length is set at
8.5 mm
,
the looper point should be centred to the needle.
Fig. 11 - 10
●
Set the stitch length at
8.5 mm
by piercing paper.
The scale on the stitch length control button is not identical with the actual stitch length.
●
By turning the balance wheel in the sewing direction, position the needle bar at
6.0 mm after
b.d.c.
●
In this position fit the screw clamp to the needle bar, so that the upwards motion of the
needle bar is blocked.
●
Adjust bracket
1
(screw
2
) in accordance with the
requirement.
Checking the looper drive eccentric
●
Turn the balance wheel in the opposite direction of sewing until the screw clamp has contact again.
●
Measure the distance between the looper point and the edge of the needle – the distance
should be 5 mm.
●
If there is any variance, turn the balance wheel in the sewing direction until the screw clamp
has contact again and carry out the following adjustment:
●
If the value measured is more than 5 mm, turn eccentric
3
(screw
4
), so that the looper
moves
half
of the difference measured to the left.
●
If the value measured is less than 5 mm, turn eccentric
3
(screw
4
), so that the looper moves
half
of the difference measured to the right.
●
After the correction on eccentric
3
has been carried out, return to the setting described in the
requirement.
Keep the stitch length setting for the next adjustment.
62-031
3
4