JUKI MF-7524 Manuale utente
1
INSTRUCTION MANUAL
MF-7524
i
CONTENTS
Ⅰ. SPECIFICATIONS ..........................................................................................................1
Ⅱ. CONFIGURATION OF THE MACHINE COMPONENTS ...............................................2
Ⅲ.
INSTALLATION....................................................................................................................... 3
1. Installing the machine head onto the table........................................................................................ 3
2. Selecting the motor pulley and the belt ............................................................................................. 5
3. Installing the motor .............................................................................................................................. 5
4. Setting the belt .....................................................................................................................................6
5. Installing the belt cover .......................................................................................................................6
6. Installing the chain...............................................................................................................................6
7. Installing the thread guide................................................................................................................... 7
8. Installing the needle bar thread take-up cover.................................................................................. 7
Ⅳ. LUBRICATION AND OILING .........................................................................................8
1. Lubricating oil....................................................................................................................................... 8
2. Oiling .....................................................................................................................................................8
3. Silicon oil lubricating unit ...................................................................................................................9
Ⅴ. OPERATION.................................................................................................................10
1. Needle.................................................................................................................................................. 10
2. Attaching the needle ..........................................................................................................................10
3. Threading the machine head............................................................................................................. 11
4. Adjusting the stitch length ................................................................................................................12
5. Adjusting the differential feed ratio..................................................................................................13
6.
Adjusting the presser foot pressure......................................................................................................... 13
7. Adjusting the thread tension.............................................................................................................14
Ⅵ. ADJUSTING THE SEWING MACHINE .......................................................................15
1. Adjusting the silicon container thread guide .................................................................................. 15
2. Adjusting the rocking thread take-up............................................................................................... 16
3. Adjusting the rocking thread take-up thread receiver.................................................................... 17
4. Adjusting the rocking thread take-up thread receiver.................................................................... 18
5. Adjusting the looper thread cam ......................................................................................................18
6. Adjusting the looper thread cam eyelet ........................................................................................... 19
7. Adjusting the looper...........................................................................................................................20
8. Adjusting the height of the needle....................................................................................................21
9. Adjusting the rear needle guard .......................................................................................................22
10. Relation between the rocking thread take-up timing and the needle thread loop ....................... 23
11. Adjusting the height of the feed dog ................................................................................................24
12. Installing position of the spreader.................................................................................................... 25
13. Adjusting the spreader thread guide and the needle clamp thread guide.................................... 26
14. Adjusting the front needle guard......................................................................................................26
15.
Adjusting the presser foot lift .............................................................................................................27
16. Adjusting the micro-lifter...................................................................................................................27
17. Adjusting the feed locus....................................................................................................................28
18. Adjustment of the feed dog in longitudinal direction ..................................................................... 30
Ⅶ.
MAINTENANCE ....................................................................................................................31
1. Cleaning the sewing machine ........................................................................................................... 31
2. Replacing the lubricating oil ............................................................................................................. 31
3. Inspecing and replacing the oil lter................................................................................................ 32
– 1 –
Model name High-speed, at-bed coverstitch machine
Model MF-7524
Stitch typeI ISO standard 607
Example of application Lap seam to knits and jersey products
Sewing speed Max. 4200 sti/min (at the time of intermittent operation)
Speed of stitch at the delivery. 3500 sti/min (at the time of intermittent operation)
Needle gauge 4-needle ... 6.0 mm
Differential feed ratio 1 : 0.7 to 1 : 2 (stitch length : less than 2.5 mm)
Micro-differential feed adjustment mechanism is provided. (Micro-adjustment)
Stitch length 1.2 mm to delivery adjustment 3.6 mm (can be adjusted up to 4.4 mm)
Needle SMX1014B #9S to #12S (standard #10S)
Needle bar stroke 31 mm (33 mm: In the case the eccentric pin is changed over)
Dimensions (Height) 451 x (Width) 515 x (Length) 263
Weight 46kg
Lift of presser foot 4 mm (with top covering)
Micro-lifter mechanism is provided.
Feed adjustment
method
Main feed ... dial type stitch pitch adjustment method
Differential feed ... lever adjustment method (micro-adjustment mechanism is provided.)
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
Noise
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 75.5 dB; (Includes KpA = 2.5 dB);
according to ISO 10821- C.6.2 -ISO 11204 GR2 at 4,200 sti/min.
. SPECIFICATIONS
– 2 –
. CONFIGURATION OF THE MACHINE COMPONENTS
Presser spring regulator Eye guard cover
Needle bar thread take-up cover Throat plate
Oil circulation inspection windows Needle tip silicon oil lubricating unit
Oil hole cap Differential lock nut
Micro-lifter Micro-adjustment knob
Needle thread silicon oil lubricating unit Finger guard
Thread guide No. 1 Rocking thread take-up
Upper pulley Front cover
Thread tension nut Needle bar thread take-up thread receiver
Oil gauge Silicon container thread guide
Feed regulating knob Belt cover
– 3 –
[For the V-belt type]
Attach the supporting board and the rubber seats as shown
in the illustration and properly install the sewing machine.
Bolt
Spacer
Washer
Spring washer
Nut
Supporting board
Spring pin
Rubber cushion (Black) × 3
Rubber cushion (Gray) × 1
1. Installing the machine head onto the table
Semi-submerged type
WARNING :
Do not insert the power plug of the motor into the receptacle until all works have been completed.
There is a danger of injury by being caught in the machine.
WARNING :
The weight of the sewing machine is more than 46 kg. Be sure to perform the work with two persons
or more in case of unpacking, transportation or installation.
.
INSTALLATION
■Installing the rubber cushion
Part No. Part name Q'ty
40072505 Dust-proof rubber
(Gray) 1
13155403 Dust-proof rubber
(Black) 3
Install the gray dust-proof rubber to section A only.
[For the V-belt type]
– 4 –
DRAWING OF TABLE (SEMI-SUBMERGED TYPE)
4- ø 3.4 on the bottom surface, depth 20
(Drill a hole at the time of set-up.)
4-10.5 hole, depth 26, spot facing depth 3.5
2- ø 3.4 on the bottom surface, depth 10
(Drill a hole at the time of set-up.)
Drilled hole 17
Installing position of drawer stopper
(on the reverse side)
Z-Z(4 locations)
Y-Y(3 locations)X-X
– 5 –
Use a motor pulley which is adaptable to this sewing machine. The sewing speed exceeds the max. sewing
speed of this sewing machine and machine trouble will be caused unless a motor pulley which is adaptable
to this sewing machine is used.
When you use a new sewing machine, use the machine at a speed of 3,200 sti/min or less for the rst 200
hours (approximately one month). A good result can be obtained in terms of the durability.
Motor pulley and belt
Motor pulley
40˚
5.5 mm
10 mm
M type V belt
Use a clutch motor of 3-phase, 2-pole, 400 W (1/2HP).
Use the M type V belt.
1) The motor pulley shifts to the left-hand side when
depressing the pedal. At this time, install the motor so
that the centers of motor pulley and lower pulley align
with each other.
* For the installing procedure of the motor pulley, refer
to the Instruction Manual for motor.
Lower pulley
2) Install the motor so that the pulley rotates clockwise.
If the machine pulley rotates in the reverse
direction, nomal lubrication cannot be
performed. As a result, machine trouble
will be caused.
* 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.
Sewing
speed
(sti/min)
50Hz 60Hz
Pulley size Belt size Pulley size Belt size
2,000 ø 45 M-32 ø 35 M-31
2,500 ø 55 M-32 ø 45 M-32
3,000 ø 65 M-33 ø 55 M-32
3,200 ø 70 M-34 ø 60 M-33
3,500 ø 75 M-34 ø 65 M-33
3,800 ø 80 M-34 ø 70 M-33
4,200 ø 90 M-35 ø 75 M-34
2. Selecting the motor pulley and the belt
3. Installing the motor
– 6 –
1) Fit belt to lower pulley .
2) Turning upper pulley , set the other side of the belt
to motor pulley .
3) Adjust the belt tension so that the belt sags 15 to 20
mm when the center of the belt is pressed with an
approximate 10N (1.02 kgf) load.
4) Securely x the belt with lock nut when the belt has
been set.
If the deection of the belt is excessive
when the sewing machine is operated,
check again the belt tension.
15 - 20mm
WARNING :
When replacing the belt, be sure to turn OFF the power to the motor and ascertain that the motor
has totally stopped rotating before starting the work. There is a danger of injury since hands or
clothes may be caught in the belt.
5. Installing the belt cover
WARNING :
Be sure to install the belt cover. If it is not installed, there is a danger of injury since hands or
clothes may be caught in the machine or a danger of damage of the machine since sewing products
may be caught in the machine.
4. Setting the belt
Install belt cover as shown in the illustration.
and are the xing screws for belt cover .
1) Hang hook of chain to presser bar lifting lever
.
2) Hook the other side of the chain to the pedal.
6. Installing the chain
– 7 –
1) Install thread guide No. 1 supplied as accessories
on the machine arm with screws (black, screw shank
length 6 mm) .
2) Install thread guide on thread guide No. 1 with
screw (black, screw shank length 6 mm) .
7. Installing the thread guide
8. Installing the needle bar thread take-up cover
Install the needle bar thread take-up cover supplied with
the unit on the machine arm with two screws .
– 8 –
<When using the sewing machine for the rst time>
Lubricating oil has been taken out at the time of delivery.
Be sure to supply lubricating oil before using the sewing
machine for the rst time.
• Oil used : JUKI GENUINE OIL 18
Do not use oil addition agent since deterio-
ration of lubricating oil or machine trouble
will be caused.
To add oil, remove rst the oil inlet cap indicated as
"OIL". Then, add oil from the oil inlet until the oil surface
reaches the middle of the upper and lower marker lines
on oil gauge .
<Checking before using the sewing machine>
1) Check oil gauge and make sure that lubricating oil
level is between the upper and lower two lines. When
lubricating oil level lowers below the lower line, supply
lubricating oil.
2) Make sure that lubricating oil comes out from the
nozzle of oil circulation identication window when
rotating the sewing machine. When lubricating oil
does not come out, perform “-3Inspecting and
replacing the oil lter”. (See page 32.)
1. Lubricating oil
Lubrication
. LUBRICATION AND OILING
When you operate the sewing machine for the rst time
or after an extended period of disuse, be sure to apply
2 to 3 drops of lubricating oil to needle bar .
For the lubricating oil, use JUKI GENUINE OIL 18.
2. Oiling
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
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