JUKI AK-159 User manual

AK-159
INSTRUCTION MANUAL

CONTENTS
1. Changing the knee lifter components .......................................................................... 1
2. Installing the air components ........................................................................................ 3
3. Wiring the pneumatic device ......................................................................................... 6
4. [ Reference ] Adjusting the parameters for the electrical box ................................... 7

– 1 –
1. Changing the knee lifter components
1) Detach the knee lifter push bar Bthat is attached
to the oil pan A.
2) Attach knee lifter push bar with rubber (asm.) ❶
to the oil pan.
Securelytthebellowsrubberintotheholeinthe
projecting portion of the oil pan.
3) Apply grease to the top end of knee lifter push
bar with rubber (asm.) ❶.
❷
Apply grease
Fit the bellows
rubber
Apply grease
❶B
A
CD
4) Detach joint lever setscrews C. Detach joint lever D.
5) Apply grease to the holes (at two locations) of joint lever (AK) ❷.
6) Attach joint lever (AK) ❷with the joint lever setscrews C.
Carefully check the mounting positions of the setscrews.
Tighten the setscrew
in the lower hole.
Tighten the setscrew
in the upper hole.
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 o󰀨 and ascertaining that the motor is at rest.

– 2 –
❺
E
G
❸
❹
❻
F
❺
❹
7) Loosen joint setscrew E. Detach E ring ❸and
take out the knee lifter rotating shaft F.
8) Attach the knee lifter rotating shaft Fto the oil pan
while adding knee lifter auxiliary rotating arm (AK)
❹and knee lifter auxiliary rotating arm spring (AK)
❺to the shaft.
At this time, apply grease to the knee lifter rotat-
ing shaft F and knee lifter auxiliary rotating arm
spring (AK) ❺.
9) Pass the knee lifter rotating shaft Fthrough the
joint G.
10) Fit E ring ❸on the knee lifter rotating shaft F.
11) Put knee lifter auxiliary rotating arm spring (AK)
❺on knee lifter auxiliary rotating arm (AK) ❹.
Then, secure knee lifter auxiliary rotating arm (AK)
❹with screw ❻.
12) Tighten joint setscrew E.
When you have removed E ring ❸,
change it with a new one.
Put the tip of knee lifter auxiliary rotating arm
spring (AK) ❺on knee lifter auxiliary rotating
arm (AK) ❹.
J
❶
Clearance
of 1 mm
or more
H
I
K
M
L
A
13) Raise the machine head. In this state, knee
lifter push bar with rubber (asm.) ❶will go up by
gradually tightening the screw I of the knee lifter
rotating arm H.
14) Stop tightening the screw Iwhen knee lifter push
bar with rubber (asm.) ❶comes in contact with
the knee lifter connecting rod J located inside the
sewing machine.
15) Loosen the screw Ito provide a clearance of 1
mm or more between the knee lifter connecting
rod Jand knee lifter push bar with rubber (asm.)
❶. Then, secure the screw with the nut K.
Check to be sure that there is an adequate clear-
ance as described above by moving knee lifter
push bar with rubber (asm.) ❶up and down from
outside.
16) Adjust the position of the screw Lso that it
comes in contact with the oil pan A when the
presser foot goes up by 16 mm. Then, secure the
screw Lwith the nut M.
If the presser foot fails to go up by 16 mm, the
clearance provided between the knee lifter push
bar with rubber (asm.) ❶and the knee lifter con-
necting rod Jshould be reduced.
17) Apply grease to the tips of the screw Iand screw
L.
Holding this
portion by
hand, move
the knee lifter
push bar
Apply grease
Apply grease
Apply grease

– 3 –
2. Installing the air components
1) Detach the rubber plug of the oil pan.
Place packing 󱢴between presser cylinder
washer 󱢳and oil pan (A). Place cylinder mount-
ing plate 󱢵to the outside of the oil pan (A) and
tighten screws M8 󱢶.
Then, secure the aforementioned parts with nuts
M8 󱢷.
󱢶
󱢳
󱢴
A
󱢵
󱢷
2) Attach speed controller joint 󱢹to cylinder 󱢸.
The recommended height of the screw of speed controller joint 󱢹is 10 mm.
* The lowering speed of the presser foot is increased by increasing the height of the screw.
* The lowering speed of the presser foot is decreased by decreasing the height of the screw.
󱢸
󱢹
10mm
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 o󰀨 and ascertaining that the motor is at rest.

– 4 –
󱢵
󱢸
󱢻-2
󱢺
󱢼
󱢻-1
3) Holding the cylinder in its initial state position,
adjust the clearance provided between the end
face of the nut of the cylinder knuckle and the
end face of the cylinder to 15 mm.
15mm
4) Connect the rear part of cylinder 󱢸with cylinder
mounting plate 󱢵using the accessory pin. When
you connect them, apply grease to the connect-
ing portion of the cylinder mounting plate.
❾
❽
❼
N
❼
❽
󱢸
❾
5) Attach presser lever ❼to the knee lifter rotating
shaft (AK) N. Temporarily tighten presser lever
setscrew ❽at the position where the setscrew
comesincontactwiththeatportionoftheknee
lifter rotating shaft (AK) N.
6) Connect the front part of cylinder 󱢸with presser
lever ❼with the accessory pin. When you con-
nect them, apply grease to the connecting portion
of the presser lever.
7) Adjust the positional relationship between presser
lever ❼and the cylinder knuckle joint so that they
do not come in contact with each other. Then,
tighten presser lever setscrew ❽and secure with
the presser lever setscrew nut ❾.
8) Attach quick coupling joints (two pieces) 󱢻and
silencer 󱢼to solenoid valve 󱢺.
Apply grease
Apply grease

– 5 –
󱢽
󱢾󱢿
9) Attach quick coupling joint 󱢾to the air inlet side
and quick coupling joint 󱢿to the air outlet side of
regulator 󱢽.
󱢽
󱢵
󱢺
󱣀
󱣁
󱣂-2
󱣂-1
󱣃
10) Secure solenoid valve 󱢺to cylinder mounting
plate 󱢵with screws M4 󱣀.
Secure regulator 󱢽to cylinder mounting plate 󱢵
with screws M5 󱣁.
11) Connect quick coupling joint 󱢻-1 with quick cou-
pling joint 󱢿with PU tube ø 6 mm 󱣂-1.
Connect quick coupling joint 󱢻-2 with speed
controller joint 󱢹with PU tube ø 6 mm 󱣂-2.
Attach one end of PU tube ø 8 mm 󱣃to quick
coupling joint 󱢾. Then, connect the other end of
the PU tube ø 8 mm to the air supply.

– 6 –
󱣄󱣅
12)Attach cable clips 󱣄to the table with wood
screws 󱣅to secure the cable of solenoid valve
󱢺.
Do not pull the cable hard when securing
it to the table.
50mm 200mm
3. Wiring the pneumatic device
14 13 12 11 10 9 8
7654321
1) Insert the cable of solenoid valve 󱢺into the
housing.
Insert the red cord into slot No. 3 and black cord
into slot No. 10.
Black cord
Red cord
Reference: Cable clip mounting position
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 o󰀨 and ascertaining that the motor is at rest.

– 7 –
In the case you use the sewing machine while set-
ting the stop position of the needle bar to the lower
position, it is necessary to adjust the parameter of
the needle bar stop position.
Menu No. 76: 165 →185
If the sewing machine is used while set-
ting the stop position of the needle bar
to the lower position, the needle bar will
interfere with the presser foot when the
latter goes up unless the aforementioned
parameter is changed.
4. [ Reference ] Adjusting the parameters for the electrical box