6
5
8
2
1
7
1-38
S-4001 ISBH+I SM 30°
Released: 09/2017
E-mail: [email protected]; webside: amfreece.com
Phone: +420 582 309 146; Fax: +420 582 360 606
E - STANDARD MACHINE ADJUSTMENT
9. ADJUSTMENT OF BARRING STITCHES
The properly set of the first
1
and of the second
2
bar is shown in the picture
beside. Each bar is performed by a half turn of the cam; in the half turn 5 stitches
are performed.
7
is the first,
10
is the last, then the cam is disengaged.
9.1. First bar adjustments
Insert a piece of paper under the clamp feet and clamp in the service mode to see
how the machine works. Turn the hand wheel through the sewing cycle until the
dog
5
releases the back shifter arm pocket
6
. Then the cam will be engaged and
start to turn while you turn the hand wheel.
The principle of work:
After a few degrees of the cam turning the clamp plate starts to move to perform
the first stitch of the bar
7
.
Needle bar is going from bottom to top, the clamp plate will move toward the right,
the needle bar holder will move toward the left, so the stitch
7
will be same length
of the others but with large bite size.
The needle needs to be with the eye at the level of the paper in the rising stroke
when the clamp plate starts to move beside toward the right.
Adjustment:
The timing of the cam turning is defined from the worm
4
on the main shaft.
Loosen the screws
3
, maintain firmly the worm and turn the hand wheel.
•
Turn a few degrees in the sewing direction to delay the timing of the cam
in relationship of the needle bar stroke. That means the needle will be
higher or out of the paper when the clamp plate moves sideways.
•
Turn a few degrees in the counter-sewing direction to advance the timing
of the cam in relationship of the needle bar stroke. That mean the needle
will be lower or inside the paper when the clamp plate starts to move
sideways.
Tighten the screws
3
after the adjustment and check the principle of work
is respected.
NOTE:
Pay attention that making this adjustment the worm
4
not slide
sideway toward the cam. The head of the worm need to stay in contact with
the bearing of the shaft, so the worm need to be pushed always toward the
front of the machine.
The principle of work:
The first stitch
7
has just been adjusted, the second stitch
8
is performed
only by the needle bar movement, coming up from left toward the right (no
clamp plate movement).
The third stitch
9
is performed as the first with the needle bar movement
from right to left in relationship of the clamp plate movement toward the
right.
If the first stitch is very well adjusted the third will be consequently well
adjusted also, in case of difference a compromise between the two positions
need to be found.