1. Turn OFF the power after stopping the thread trimming, or turn ON
the threading switch and lower the intermediate presser
.
(Caution) As for the height of needle
when adjusting the wiper
, set the height when the sewing machine stopped af-
ter trimming the thread actually.
2. Push wiper link section
A
and move the top end of the wiper
to
the under side of the needle.
3. In the state of the above item 2. , loosen setscrew
and adjust the
clearance between the wiper and the tip of the needle should be (1
mm) and the opening angle should be (15
°
To 20
°
). Then tighten
setscrew
.
4. Push wiper link section
A
to the last and loosen setscrew
.
5. In the state of the above item 4. , adjust the longitudinal (10 mm) and
lateral positions of the wiper
. Then tighten setscrew
.
o If the clearance between the wiper
and needle
is too small, the
wiper comes in contact with the
needle
due to uneven stop
position of the main shaft, causing
needle breakage.
o If the clearance between the wiper
and needle
is excessive,
the wiper comes in contact with
the intermediate presser
and
the wiper will damage the inter-
mediate presser
. Also, the in-
termediate presser
can not go
up.
o If a clearance of 10 mm between
the inside of V letter of the wiper
and the center of needle
is
mistakenly set, the wiper fails to
spread the thread.
o Similarly, If the center of needle
does not align with the V letter of
the wiper
, the wiper fails to
spread the thread.
o If the opening angle of the wiper
is excessive, thread sweeping
failure will occur.
– 40 –
Adjustment Procedures
Results of Improper Adjustment