JUKI AK-157 User manual

INSTRUCTION MANUAL

AK-157

CONTENTS

1. FEATURES.............................................................................................. 1

2. INSTALLATION ....................................................................................... 2

(1) Replacing the AK lever (asm.)..............................................................................2

(2) Installing the presser sensor detection plate.....................................................3

(3) Subassembling the AK motor ..............................................................................3

(4) Installing the AK motor.........................................................................................5

(5) Checking the assembly ........................................................................................6

(6) Connection.............................................................................................................7

(7) Selecting with / without the AK device................................................................7

(8) Adjusting the sensor.............................................................................................8

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 environ-

ment is maintained.

③Function for reducing the presser foot pressure at the beginning of sewing

In the case the needle thread cannot be brought under the material while the thread presser de-

vice (NB device) is used, the assistance function that reduces the presser foot pressure at the

beginning of sewing to allow the needle thread to be smoothly brought under the material can be

set.

* Refer to [ Handling of troubles that occur at the beginning of sewing ] in "5-2. Adjusting the nee-

dle thread presser device" in the Instruction Manual for how to set the assistance function.

1. FEATURES

– 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.

3) Loosen presser-lever fulcrum shaft setscrew

❹from above the top of the arm. Remove

presser-lever fulcrum shaft ❺.

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 a

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.

❻

❺

❻

❺

❻

❼

❽

Provided

with a roller

0.1mm

Fig. A

❶

❷

❸

AK lever (asm.)

2) Remove knee-lifter bar hinge screw ❸.

❹

(1) Replacing the AK lever (asm.)

– 2 –

❶

❸❷

Detecting portion (leftward)

Fig. B

❹

❺

❶

❷❹

(2) Installing the presser sensor detection plate

1) Attach presser detector plate ❶to knee lifter

link plate ❸with screw ❷.

At this time, the orientation of presser detec-

tor plate ❶should be as shown in Fig. B

(3) Subassembling the AK motor

1) Attach presser lifter motor ❶to motor mount-

ing plate ❷with four hexagon socket head

bolts ❸.

Fig. C

2.2 to 2.5mm

❶

❷

❸

2) Attach cam ❹to presser lifter motor ❶with

setscrew ❺.

At this time, adjust the clearance provided be-

tween motor mounting plate ❷and cam ❹to

2.2 to 2.5 mm.

(See Fig. C.)

* It is recommended to sub-assemble the parts

while putting a 2.5-mm hexagonal wrench key

between the motor mounting plate and cam

to obtain the clearance of 2.2 to 2.5 mm.

– 3 –

Position of

screw ❾

Completed state of subassembly

3) Attach sensor ❻to sensor mounting plate ❼

with screw with washer ❽.

Attach sensor mounting plate ❼to motor

mounting plate ❷with screw ❾.

At this time, attach the sensor mounting plate

❼by tightening screw ❾at its center of slot.

4) Connect junction cable 󱢳to sensor ❻.

❷

❼

❾

❻

❼

❽

❼

󱢳

❻

– 4 –

1) 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.

2) Temporarily fix presser motor asm. 󱢴with

three presser motor asm. setscrews 󱢳.

At this time, move presser motor asm.

󱢴

and down to adjust its position to such a posi-

tion that it does not lift up cam roller

󱢵

. (After

the adjustment, the presser foot is in the oat-

ing state.)

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

󱢳

󱢴

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

󱢶

❻

󱢵

Light-contact state

󱢶❾

Securely tighten three presser motor asm. set-

screws 󱢳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.)

(4) Installing the AK motor

– 5 –

❷

❶

❸

(5) Checking the assembly

1) Operate presser foot lifting lever ❸to check

to make sure that detector plate ❶does not

interfere with sensor ❷.

– 6 –

❸❷

❹

❶

❺

A B

❶

❸

❷

(6) Connection

1) Connect the junction cable connector to

presser foot lifting motor ❶and electrical box

❷.

Bind the extra length of cable with cable clip

band ❸.

(7) Selecting with / without the AK device

1) Turn power ❺ON while keeping ❶

held pressed. The function setting screen is

displayed.

2) Press ❷to set setting No. Ato

"107". Then, press ❸ to ash set value

B ON and OFF.

3) Press ❷to set the set value B to

"0". Then, press ❹.

– 7 –

❸❷

❹

❶

❺

A B

Align

(8) Adjusting the sensor 1) Turn power ❺ON while keeping

❶held pressed. The func-

tion setting screen is displayed.

2) Press ❶.

The screen is changed over to

the sewing mode screen.

3) Depress the back part of pedal.

The origin is retrieved and the

presser foot is held at its upper

position. Depress the back part

of pedal again to lift the presser

foot.

4) Keep ❶held pressed.

The function setting screen is dis-

played.

5) While the function setting No.

ashes ON and OFF, press

❷to set the function set-

ting No. A to "123".

6) Press ❸ to ash set value B ON and

OFF.

Press ❷. Then the cam rotates

by the number of pulses corresponding to

the number of times you have pressed

❷by pressing ❹.

Adjust so that the marker line on the cam 󱢶

is aligned with the edge of plate ❾.

* If you have failed to follow the correct step of

procedure in the middle of operation, do not

press ❹. Instead, press ❶to

exit from the function setting screen.

With the aforementioned measure, it is pos-

sible to exit from the function setting screen

without saving the data you have changed.

󱢶❾

󱢶

❾

– 8 –

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