JUKI AK-154 User manual

1
INSTRUCTION MANUAL
AK-154

i
CONTENTS
1. FEATURES.............................................................................................. 1
2. INSTALLATION ....................................................................................... 2
3. HOW TO SELECT THE FUNCTION OF AUTO-LIFTER ....................... 5
4. OTHERS (Advanced edition) ................................................................ 6
4-1. Function for reducing the presser foot pressure at the beginning of sewing ....6
4-2. Presser foot lifting height setting function in the case the sewing machine
stops with its needle-bar up.................................................................................7
4-3. Presser operating speed changing function ......................................................7

This is the auto-lifter incorporating the cam which is driven by the stepping motor.
①After the presser foot is lifted by the auto-lifter, it is retained at its upper position by the cam. As a
result, the power consumption is reduced.
②Since this auto-lifter does not produce solenoid-like impact noise, the comfortable work environment
is maintained.
③Function for reducing the presser foot pressure at the beginning of sewing
If the needle thread is not properly drawn down under the material fabric while the thread presser
(NB device) is used, the assist function for reducing the presser foot pressure at the beginning of
sewing to help the needle thread to be smoothly drawn under the material fabric can be enabled.
* The AK device operates with the factory-set value by turning it ON.
④Presser-foot lifting height setting function
The lifting height of the presser foot can be set in two different stages. When the back part of pedal
is depressed during sewing, the thread trimmer trims thread, then the presser foot automatically
goes up to its 1st lifting height.
When the back part of pedal is strongly depressed while the sewing machine is at rest or after the
completion of thread trimming, the presser foot goes up to its 2nd lifting height.
Factory-set amount of lift of the
presser foot at the time of shipment
Features
1st lifting height of presser foot 5.0 mm 0.1 to 8.5 mm
2nd lifting height of presser foot 8.5 mm 8.5 to 13.5 mm
1. FEATURES
⑤Presser operating speed changing function
For reducing the operating noise or further reducing the material damage by the presser foot when
it is lowered to contact the material, the presser operating speed can be changed appropriately.
– 1 –

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
2. INSTALLATION
(1) Loosen setscrew ❷of side plate ❶. Remove side plate ❶.
* Side plate ❶and setscrew ❷removed as described above are not used again since they are replaced
with the parts to be retrotted to the sewing machine.
(2) Remove knee-lifter bar hinge screw ❸.
(3) Loosen presser-lever fulcrum shaft setscrew
❹from above the top of the arm. Remove
presser-lever fulcrum shaft ❺.
❶
❷
❹
❸
1. Apply the grease supplied with the
unit to each joining section.
2. Press AK lever asm. ❻against the
sewing machine frame. Then, move
the former so that it is spaced 0.1
mm from the latter. In this state,
fasten presser lever fulcrum shaft
setscrew ❹to secure presser lever
fulcrum shaft ❺.
Check to make sure that AK lever
asm. ❻moves smoothly.
Check to make sure that the slit in
presser lever fulcrum shaft ❺is
positioned horizontally.
(5) Attach knee-lifter connecting rod ❼to the AK
lever. Fix cable clip band ❽in the hole through
which knee-lifter connecting rod ❼of AK lever
is to be passed through. Then, insert knee-lifter
connecting rod ❼into the cable clip band.
(4) Install AK lever asm. ❻which is provided with
a roller instead of the removed parts.
* For the AK device which is purchased in the shipped state, it has already been factory-adjusted.
The AK device can be put into use after connecting its connector (CN37) to the destination of connection
in the control box. (Refer to "2. Installation procedure (10) to (11)").
❻
❺
❻
❺
a
❻
❼
❽
Provided
with a roller
0.1mm
Fig. A
– 2 –

(6) There is a marker line on the surface of cam 󱢶.
Adjust so that marker line Aon the cam and end face B of motor xing plate ❾are collinear to each other.
* Do not disassemble the cam 󱢶and the motor since their origin positions have been facto-
ry-adjusted appropriately at the time of delivery.
(7) Temporarily x presser motor asm. 󱢴with three presser motor asm. setscrews 󱢳.
At this time, adjust motor asm. 󱢴up and down to bring presser motor asm. 󱢴to such a position that it
does not push up the cam roller 󱢵. (The presser foot sole fails to come in contact with the throat plate.)
Securely tighten three presser motor asm. setscrews 󱢳while bringing cam roller 󱢵and cam 󱢶into light
contact with each other. (Check to make sure that the presser foot sole does not oat above the feed dog.)
Adjust presser motor asm. 󱢴so that cables and wires located inside the sewing machine
are positioned above the xing plate ❾.If the cables and wires are positioned under the
xing plate ❾, they will interfere with the cam 󱢶.
󱢶
❾
󱢳
󱢳
󱢴
󱢶
❻
If the cam roller 󱢵is
raised, the problem
that the presser foot
sole fails to come in
contact with the throat
plate can occur.
Collinear
󱢵
Light-contact state
󱢶❾
B
A
(8) Remove handwheel 󱢺and pulley cover 󱢷.
Connect motor terminal (blue) 󱢸to the INT
PCB connecter under the main motor.
(9) Route the motor cable along the main motor
cable. Secure them with cable clip band 󱢹
supplied with the unit.
󱢸
󱢹
󱢺
󱢷
– 3 –