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1-4. Wiper position
*
Turn the power ON once. Set the intermediate presser height to 3.5 mm. Then, lower the in
-
termediate presser and turn the power OFF again.
1) If the needle thread is not sucked when the wiper is driven since needle thread drawing position is
incorrect, adjust the wiper position using height-direction positioning screw
❶
, wiper forward-travel
amount adjusting screw
❷
and return position adjustment nut
❸
.
❸
Adjustment of the returning position of the wiper
1) Adjust the returning position of the wiper so
that the undersurface of the wiper
❹
is locat-
ed 0 to 3 mm above the center of the suction
mouth of the thread suction device
❺
.
Also adjust so that a clearance of 0.5 to 2 mm
is provided between the wiper
❹
and the suc-
tion mouth
❺
.
Adjustment of the forward travel position of the wiper
1) Vertical clearance between the top end of the
wiper and the needle tip (moving needle side)
when the former passes the latter: Adjust to 1
to 3 mm.
2) Clearance between the top end of the wiper and
the needle
❻
(moving needle side) when the
wiper travels forward until it will go no further:
Horizontal clearance: Adjust to 1 to 3 mm; verti-
cal clearance: Adjust to 2 to 5 mm.
Adjustment of the lateral position of the wiper
1) Adjust the projection amount of the top end of
the wiper from the needle
❻
(moving needle
side) when the wiper travels forward until it will
go no further to 1.2 to 1.8 mm.
❹
❺
❻
❶
❷
❻
❹
0.5
to
2mm
0 to 3mm
1 to 3mm
1 to 3mm
1.2 to 1.8mm
2 to 5mm
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.