− 88 −
Perform adjustng the needle-to-hook relaton when
the needle enters the center of the needle hole n the
throat plate.
(1) Needle bar heght
1) Brng down the needle bar to the lowest pont.
2) Insert the part [1]
A
of tmng gauge nto the gap be-
tween the bottom end of needle bar and throat plate,
where the bottom end of the needle bar touches the top
of the part [1]
A
of the tmng gauge.
3) Loosen needle bar connecton screw
1
, and ad-
just the heght of the needle bar.
(2) Set the needle to hook relation in the follow
-
ing way
1) Rotate the hand pulley n the correct drecton untl
the needle starts to go up from ts lowest pont.
2) Insert the part [2]
B
of the tmng gauge nto the
gap between the bottom end of the needle bar
and the throat plate, where the bottom end of the
needle bar touches the top of the part [2]
B
of the
tmng gauge.
3) Loosen setscrew
C
of the hook sleeve, and algn
blade pont of the sewng hook wth the center
of needle hole. Make adjustment so that a clear-
ance of approx. 0.05 mm s provded between the
needle and the blade pont of the hook.
(3) Adjusting the bobbin case positioning stopper
Adjust wth setscrew
3
so that the contact of the
top end of bobbn case postonng stopper
1
and the end of nner hook
2
s 0 to 0.2 mm.
1. MAINTENANCE
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
0.05 mm
0 to 0.2 mm
1-1. Adjusting the needle-to-hook relation
#
. MAINTENANCE
OF SEWING MACHINE
C
B
3
2
A
1
1
Содержание AC-172N-1790
Страница 1: ...AC 172N 1790 INSTRUCTION MANUAL ENGLISH ...
