JUKI AMS-221EN Series Engineer's Manual page 45

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
, set the height when the sewing machine stopped af-
ter trimming the thread actually.
2. In the state of the above item 2. , loosen setscrew
clearance toward the tip of the needle, the clearance toward the in-
termediate presser
setscrew .
3. In the state of the above item 2. , adjust the clearances between the
wiper and needle tip and between the wiper
presser after loosening the setscrew
angle (15° to 20°) and tighten the setscrew
4. Push wiper link section
5. In the state of the above item 4. , adjust the longitudinal (10 mm) and
lateral positions of the wiper
(Caution) After the modification of the needle bar height, needle
size (boldness), and intermediate presser height, adjust
the wiper
* Length of the needle
needle tip shape and needle size (boldness).
Adjustment Procedures
when adjusting the wiper
, and the opening angle (15˚ to 20˚). Then tighten
. Then, adjust the opening
to the last and loosen setscrew
A
. Then tighten setscrew
, without fail.
can change according to the
.
and adjust the
and intermediate
.
.
.
– 41 –
Results of Improper Adjustment
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
the wiper will damage the inter-
mediate presser . Also, the in-
termediate presser
up. (intermediate presser step-
out)
o If a clearance of 10 mm between
the inside of V letter of the wiper
and the center of needle
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.
and
can not go
is