ENGLISH
MF-7500D,7900D
INSTRUCTION MANUAL
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CONTENTS
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.SPECIFICATIONS
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.SELECTING THE MOTOR PULLEY AND THE BELT
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.OILING
$
.REPLACING THE LUBRICATING OIL
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HOW TO USE THE INSTRUCTION MANUAL FOR MF-7500D/7900D
(Caution) Only the exclusive portions of MF-7500D/7900D are described in this Instruction Manual. For the items
other than those, refer to the Instruction Manual for MF-7500 or MF-7900.
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!
SPECIFICATIONS
日本語
Model name
Model
Stitch type ISO standard 406, 407, 602, and 605
Example of application Hemming and covering for knits and general knitted fabrics
Sewing speed
Needle gauge
Differential feed ratio
Stitch length
Needle UY128GAS #9S to #12S (standard #10S)
Needle bar stroke 31mm (or 33 mm when changing over the eccentric pin)
Dimensions (Height) 451 x (Width) 515 x (Length) 263 (Height) 450 x (Width) 468 x (Length) 264
Weight 46 kg 42 kg
Lift of presser foot
Feed adjustment
method
Looper mechanism Spherical rod drive method
Lubricating system Forced lubrication method by gear pump
Lubricating oil JUKI GENUINE OIL 18
Oil reservoir capacity Oil gauge lower line : 600 cc to upper line : 900 cc
Installation Semi-submerged type Top mount type, Semi-submerged type
Noise
Semi-dry head, high-speed, at-bed coverstitch
machine
MF-7500D series MF-7900D series
Max. 5,000 sti/min (during intermittent operation)
Factory-set sewing speed at the time of shipment. 4,000 sti/min (during intermittent operation)
3-needle ... 4.8mm, 5.6 mm and 6.4 mm
2-needle ... 3.2 mm and 4.0 mm
1 : 0.7 to 1 : 2 (stitch length : less than 2.5 mm)
Micro-differential feed adjustment mechanism is
provided. (Micro-adjustment)
1.2 mm to 3.6 mm (can be adjusted up to 4.4 mm) 0.9 mm to 3.6 mm (can be adjusted up to 4.5 mm)
8 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering)
Micro-lifter mechanism is provided.
Main feed ... dial type stitch pitch adjustment method
Differential feed ... lever adjustment method (micro-adjustment mechanism is provided.)
- Equivalent continuous emission sound
pressure level (LpA) at the workstation :
A-weighted value of 74.0 dB; (Includes KpA =
2.5 dB); according to ISO 10821- C.6.2 -ISO
11204 GR2 at 4,000 sti/min.
Semi-dry head, high-speed, cylinder-bed
coverstitch machine
3-needle ... 5.6 mm and 6.4 mm
2-needle ... 3.2 mm, 4.0 mm and 4.8 mm
1 : 0.9 to 1 : 1.8 (stitch length : less than 2.5 mm)
(1:0.6 to 1:1.1, when the differential link hinge
screw is changed)
Micro-differential feed adjustment mechanism is
provided. (Micro-adjustment)
- Equivalent continuous emission sound pressure
level (LpA) at the workstation :
A-weighted value of 76.5 dB; (Includes KpA = 2.5
dB); according to ISO 10821- C.6.2 -ISO 11204
GR2 at 4,000 sti/min.
FRANÇAISDEUTSCH
ESPAÑOL ITALIANO
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SELECTING THE MOTOR PULLEY AND THE BELT
Motor pulley and belt
MF-7500D MF-7900D
Sewing speed
(sti/min)
3,500 ø 80 M-34 ø 65 M-33 ø 80 M-38 ø 65 M-37
4,000 ø 90 M-35 ø 75 M-34 ø 90 M-38 ø 75 M-37
4,500
5,000
Pulley size Belt size Pulley size Belt size Pulley size Belt size Pulley size Belt size
50Hz 60Hz 50Hz 60Hz
ø 100 M-35 ø 85 M-35 ø 100 M-39 ø 85 M-38
ø 115 M-36 ø 95 M-35 ø 115 M-40 ø 95 M-39
* The table shows the numbers when a 3-phase 2-pole 400 W clutch motor (1 / 2 HP) is used.
* The commercially-available motor pulley near to the counted value is designated since the outside diameter of the
commercially-available motor pulley counts by 5 mm.
Use a motor pulley which is adaptable to this sewing machine. The sewing speed exceeds the max. sew-
ing speed of this sewing machine and machine trouble will be caused unless a motor pulley which is
adaptable to this sewing machine is used.
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中文
TÜRKÇE
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#
OILING
If inside of the frame is oiled, the grease
NO OILING
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$
REPLACING THE LUBRICATING OIL
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 off and ascertaining that the motor is at rest.
The mechanisms inside the frame such as the
needle bar, presser lift and spreader components
are lubricated with grease. Never add oil inside
the frame.
will be expelled, resulting in mechanical
failure.
MF-7500D
1
In case of the new sewing machine, replace the lubricating oil (JUKI GENUINE OIL 18) with new one after using it for
approximately one month. Then replace the lubricating oil every six months.
1) Set a container to receive the lubricating oil under drain screw
2) Remove drain screw
3) After the drain, wipe out the oil and attach the drain screw
. The lubrication oil is drained.
1
MF-7900D
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