JUKI AK85C User manual

AK85C
INSTRUCTION MANUAL

– 1 –
INSTALLATION
Congratulations on your purchase of a JUKI's window-plate-mounting type Auto lifter.
The main features of this device are as follows: 1) Simple installation, 2) Usable in combination with the knee lifter.
Please read these instructions to assure long-term satisfactory usage.
1. Press the OFF button of the power switch to turn OFF
the power after conrming that the sewing machine
has stopped.
2. Check to make sure that the power switch is in the OFF
state. Then, unplug the power cord.Perform the work
of step 3. after conrming that the power has been cut
and it has passed for 5 minutes or more.
3. Remove the side plate.
Replace the hinge screw of the knee lifter horizontal
bar and the hinge screw of the knee lifter link with
horizontal bar pin ❶and hinge screw ❷supplied with
the unit. Install knee lifter link spring ❸as illustrated
in the gure.
No clearance is provided
between frame and sponge
No clearance is
provided in the
notch
Tension release wire
Knee lifter horizontal bar
4. Make sure that a sponge is placed as illustrated in
the gure. If not, pass the tension release wire in
the upper notch and pass the knee lifter horizontal
bar in the lower notch so that no clearance is pro-
vided in the notches. In addition, make sure that
there is no clearance between the frame and the
sponge.
* Improperly-installed sponge can be a cause of oil
leakage from the bobbin winder.
❶❸
❷

– 2 –
6. Install side plate (asm.) ❹on the sewing machine.
At this time, install side plate (asm.) so that the slot
in solenoid link ❼ ts over knee lifter horizontal bar
pin ❶.
5. Remove washer ❺ and nut ❻ from side plate
(asm.) ❹of the device.
7. Install solenoid (asm.) ❽with washer ❺and nut ❻.
8. Lower the presser foot until it comes in close
contact with the throat plate. Turn solenoid shaft
counterclockwise with a screwdriver Awith the
solenoid pressed in the direction of the arrow, then
tighten the connecting stud clamping screw with
hexagonal wrench key B.
(Caution) The adequate tightening torque is 3.4 to
5.9 N·m. Be aware, if the connecting stud
clamping screw is excessively tightened,
the solenoid arm can break.
❶
❹❼
❹
❺
❻
AB
❽
❺
❻

– 3 –
9. Pass the solenoid cord inside solenoid shaft ❾.
10. Connect the solenoid connector to connector Cfor
the AK solenoid on the back surface of the control
box.
❾
ペペペ
For upgrading
Connector
connection diagram
Auto-lifter
Solenoid &
LED/TB unit
Pedal
C
C

– 4 –
SPECIFICATIONS
○Presser foot lifting amount : Standard 9mm.
○Max. presser foot pressure : 88N.
* Line voltage : At 100%
11. Adjustment of the oating amount of the tension disc No. 2.
A. How to check the oating amount of the tension disc
No. 2
1. Turn the main shaft until the bottom end face of needle
eyelet is almost aligned with the top surface of throat plate.
2. Press thread trimmer solenoid plunger 󱢳to the left.
3. Check to make sure that the roller does not come in con-
tact with the thread trimmer cam.
4. Check to make sure that the oating amount of the tension
disc No. 2 󱢴is in the range of 0.5 mm to 1 mm.
B. How to adjust the oating amount of the tension disc
No. 2
1. To increase the oating amount, loosen screw 󱢵, and
move tension release wire 󱢶to the right.
2. To decrease the oating amount, loosen screw 󱢵, and
move tension release wire 󱢶to the left. After adjustment,
securely tighten screw 󱢵.
(Caution) 1. To perform re-turning ON of the power, be sure to perform after the time of one second or more
has passed. (If ON / OFF operation of the power is performed quickly, setting may be not changed
over well.)
2. Auto-lifter is not actuated unless this function is properly selected.
3. When “FL ON” is selected without installing the auto-lifter device, starting is momentarily delayed
at the start of sewing. In addition, be sure to select “FL OFF” when the auto-lifter is not installed
since the touch-back switch may not work.
󱢴
Almost aligned 󱢵
󱢶
󱢳
Thread trimmer cam
Roller