JUKI MH-481, Instruction Manual, Page: 11 / 184

– 1 –
ENGLISH
SPECIFICATIONS
Model MH-481 MH-481-4/-5 MH-484 MH-484-4/-5
Sewing type 1-needle, double chainstitch machine
1-needle, double chainstitch,
differential-feed machine
Sewing speed Max. 5,500 sti/min
Stitch length 1 to 4 mm
Main feed : 1 to 4 mm
Auxiliary feed : 1 to 5.6 mm
Differential
feed raito
―
Stretching stitch max. 1 : 0.5
Gathering stitch max. 1 : 3.0
Standard 1 : 1.5
Lift of presser
foot
Hand lifter lever : 5 mm, Knee lifter : 10 mm
Stroke of
needle bar
30 mm
Needle TV × 7 #9 to #18 (Standard : #11)
Stitch length
adjustment
method
Dial type
Safety stitch Condensation stitch/reverse-feed stitch (by feed lever)
Looper mech-
anism
Inclined crank type
Looper stroke 21.5 mm (2.1 to 3.3 mm) 21.5 mm
Lubrication
system
Fully automatic lubrication
Oil JUKI New Defrix Oil No.1
Noise
- Equivalent continuous
emission sound pres-
sure level (L
pA
) at the
workstation:
A-weighted value of
88.5 dB; (Includes K
pA
= 2.5 dB); according
to ISO 10821- C.6.2
-ISO 11204 GR2 at
5,500 sti/min.
- Sound power level
(L
WA
);
A-weighted value of
94.0 dB; (Includes
K
WA
= 2.5 dB); ac-
cording to ISO 10821-
C.6.2 -ISO 3744 GR2
at 5,500 sti/min.
- Equivalent continuous
emission sound pres-
sure level (L
pA
) at the
workstation:
A-weighted value of
87.5 dB; (Includes K
pA
= 2.5 dB); according
to ISO 10821- C.6.2
-ISO 11204 GR2 at
5,500 sti/min.
- Sound power level
(L
WA
);
A-weighted value of
93.0 dB; (Includes
K
WA
= 2.5 dB); ac-
cording to ISO 10821-
C.6.2 -ISO 3744 GR2
at 5,500 sti/min.
- Equivalent continuous
emission sound pres-
sure level (L
pA
) at the
workstation:
A-weighted value of
88.5 dB; (Includes K
pA
= 2.5 dB); according
to ISO 10821- C.6.2
-ISO 11204 GR2 at
5,500 sti/min.
- Sound power level
(L
WA
);
A-weighted value of
94.0 dB; (Includes
K
WA
= 2.5 dB); ac-
cording to ISO 10821-
C.6.2 -ISO 3744 GR2
at 5,500 sti/min.
- Equivalent continuous
emission sound pres-
sure level (L
pA
) at the
workstation:
A-weighted value of
89.0 dB; (Includes K
pA
= 2.5 dB); according
to ISO 10821- C.6.2
-ISO 11204 GR2 at
5,500 sti/min.
- Sound power level
(L
WA
);
A-weighted value of
94.0 dB; (Includes
K
WA
= 2.5 dB); ac-
cording to ISO 10821-
C.6.2 -ISO 3744 GR2
at 5,500 sti/min.
• Before you put the machine into operation for the fi rst time after the set-up, clean it thoroughly .
Remove all dust gathering during transportation and oil it well.
• Confi rm that voltage has been correctly set.
Confi rm that the power plug has been properly connected to the power supply.
• Never use the machine in the state where the voltage type is different from the designated one.
• The direction of normal rotation of the machine is counterclockwise as observed from the pulley side.
Take care not to allow the machine to rotate in the reverse direction.
• Never operate the machine unless the oil pan has been fi lled with oil.
• For a test run, remove the thread.
• For the fi rst month, decrease the sewing speed and run the sewing machine at a speed of 4,500
sti/min or less.
• When you carry the sewing machine, keep hands away from the detector located behind the handwheel.
• Operate the handwheel after the machine has totally stopped.
CAUTION :
Check the following so as to prevent maloperation of and damage to the machine.
BEFORE OPERATION