– 12 –
(6) Adjusting the double chain looper (Applicable only to MO-6816S)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Standard adjustment
1) Returning amount of the double chain looper
G
: The distance between the blade point of the double chain looper
❸
and the center of the needle
❹
should be as follows when the double chain looper
❸
is at the extreme left of its travel.
G
❶
❸
❹
❷
❺
(Unit : mm)
Model
G
Safety stitch machine
MO-6816S-3 H
1.4-1.9
MO-6816S-50H
1.6-2.3
MO-6816S-60H
MO6816S-30P
1.4-1.9
(Caution) The dimensions given in the table are standard
ones to be used to adjust the looper. They are
intended to be used for reference and should
be changed more or less in accordance with
the sewing products and thread to be used.
2) Longitudinal motion (Avoid motion)
The standard minor axis of the elliptical motion should be 3.0
mm.
(Caution) The avoid motion should be adjusted in accor-
dance with needle count.
3) Clearance between the double chain looper and the needle
The clearance should be 0 ± 0.05 mm.
Tip has to be located
inside the side face
of needle.
❸
❹
0 ± 0.05 mm
❹
❸
B
A
❸
❹
❻ ❽
⊖
⊕
❼
C
❽
❼
Detail drawing C
Spring washer
Plain washer
Screw position
Longitudinal
motion (mm)
Minimum
position
2.75
Intermediate
position
Approx. 3
Maximum
position
3.35
