1. Cleaning the motor fan .......................................................................................................... 18
i
Page 3
!
. SPECIFICATIONS
Model nameHigh-speed, at-bed coverstitch machine
ModelMF-7500 seriesMF-7500D series
Stitch typeISO standard 406, 407, 602, and 605
Example of application
Sewing speedMax. 6,500 sti/min (at the time of intermittent operation)
V-belt type
Max. 6,000 sti/min (at the time of intermittent operation)
Direct-drive type
Speed of stitch at the delivery:
4,500 sti/min (at the time of intermittent operation)
Needle gauge3-needle .....4.8 mm, 5.6 mm, and 6.4 mm
2-needle ..... 3.2 mm and 4.0 mm
Differential feed ratio1 : 0.7 to 1 : 2 (stitch length : less than 2.5 mm)
Micro-differential feed adjustment mechanism is provided. (Micro-adjustment)
Stitch length
NeedleUY128GAS #9S to #14S (standard #10S)UY128GAS #9S to #12S (standard #10S)
Needle bar stroke31 mm (33 mm when the eccentric pin is changed over)
Dimensions(Height) 451 x (Width) 523 x (Length) 279
Weight49 kg (With pneumatic type thread trimmer) , 46 kg
Lift of presser foot8 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering)
Feed adjustment
method
Looper mechanismSpherical rod drive method
Lubricating systemForced lubrication method by gear pump
Lubricating oilJUKI GENUINE OIL 18
Oil reservoir capacityOil gauge lower line : 600 cc to upper line : 900 cc
Max. 5,000 sti/min (at the time of intermittent operation)
V-belt type
Max. 5,000 sti/min (at the time of intermittent operation)
Direct-drive type
Speed of stitch at the delivery:
4,000 sti/min (at the time of intermittent operation)
- 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.
@
. AT THE BEGINNING
1
Remove xed band 1 for transportation before setting
up the sewing machine.
– 1 –
Page 4
#
INSTALLING THE ACCESSORIES
.
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.
1. Installing the presser lifting cylinder
4,7
3
1
8
1 to 2 mm
2
5
9
6
2. Installing the air regulator
1) Install presser lifting cylinder asm.
machine with screws 3, washers 4 and spring
washers 7.
2) Tighten screw
of 1 to 2 mm is provided between cap 9 at the top
end of presser lifting cylinder asm. 1 and presser
lifting lever 2.
If the clearance cannot be adjusted to 1 to 2 mm,
adjust the height of nut 8 and cap 9 to obtain the
correct clearance between the cap and lever.
3) Adjust the height of screw
struction Manual for MF-7500 (
the presser foot lift
4) Stroke of cylinder asm.
that presser lifting lever 2 comes in contact with
screw 5 within the range of cylinder stroke.
in such manner that a clearance
3
referring to the In-
5
), and tighten nut 6.
is 30 mm. Make sure
1
to the sewing
1
^
Adjusting
-15.
2
1) Install air regulator asm. 1 under the table with
wood screws 2.
1
– 2 –
Page 5
3. Installation and setting SC-921
(1) Installing the SC-921 on the table ( Semi-submerged type )
Fig. A
Convex
washer
Spring
washer
Hexagonal nuts
1
2
2
4
3
5
6
6
!0
7
!0
8
9
1) Install right and left support plates 1 and two rubber seats 2 of the respective support plates.
2) Install control box mounting plate 3 on the control box with four screws 4.
3) Install the parts assembled in Step 2) on the underside of support plates 1 with four screws 5.
4) Install support plates 6 and the control box on the table with mounting bolts asm. 1 supplied with the unit. At
this time, insert the nuts and washers supplied with the unit as illustrated in Fig.
so that the support plates
A
and the control box are securely xed.
5) Install the control box (or the one equipped with a small sized motor unit) on the table. Then, install the sewing
machine head on the table. (Refer to the Instruction Manual for the sewing machine.)
6) Install the mounting plate 9 on the CP-18 panel 7 with four tapping screws 8 supplied with the unit.
At this time, take care not to allow the cable to be caught under the mounting bracket.
7) Install CP-18 panel 7 on the table with wood screw !0.
– 3 –
Page 6
(2) Connecting the cords
1
A
1) Pass cords 1 of the thread trimming solenoid,
reverse-stitching solenoid, etc. and the cord from
the motor through hole A in the table to route them
down under the machine table.
!1
!2!0
3
8
9
5
B
2
2) Loosen screw B in cover 2 with a screwdriver to
open the cover.
6
7
!4
3) Connect 14P code 3 coming
from the machine head to connector 6 (CN36).
4) Insert 3P cord 9 coming from
the machine head into connector !0 (CN42).
5) Insert presser foot lifter cord 2P
into connector 7 (CN37).
!3
4
6) Connect connector 5 coming
from the motor to connector 8
(CN30) on the circuit board.
4
7) Insert pedal sensor cable !1 into connector !2 (CN34).
8) Insert motor fan cord !3 into connector !4.
Be sure to securely insert the respective connectors after checking the inserting directions since all connectors have the inserting directions. (When using a type with lock, insert the connectors until they go to
the lock.) The sewing machine is not actuated unless the connectors are inserted properly. In addition, not
only the problem of error warning or the like occurs, but also the sewing machine and the control box are
damaged.
[Connecting the connector for the operation panel]
!6
!5
The connector for the operation panel is provided.
Paying attention to the orientation of the connector !5,
connect it to connector (CN38) !6 located on the circuit
board. After the insertion, securely lock the connectors
to prevent them from coming off easily.
Be sure to turn OFF the power before connecting the connector.
– 4 –
Page 7
(3) Setting procedure of the machine head
For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used
for the setting procedure of the machine head.
4321
1) Call function setting No. 95.
2) The type of machine head can be
selected by pressing
switch 4).
* Refer to the
"MACHINE HEAD LIST"
switch 3 (
on the separate sheet or the Instruction Manual for the machine head of
your sewing machine for the type of
the machine head.
96 or 94, and the display automatically changes to the contents of the
setting corresponding with the type of
machine head.
4321
– 5 –
Page 8
(4) Setting the lower stop position of the needle bar
4321
Call function setting No. 122. Check to
be sure that the lower stop position of
the needle bar is as shown in
not, adjust the lower stop position of the
needle bar properly using function setting
No. 122. (Adjustment can be made within
the range of ±15°).
Fig. 1
. If
Fig. 1
– 6 –
Page 9
$
. AIR PIPING DRAWING
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. In addition, cut the air
supply from air compressor.
1. Piping of the thread trimmer device
1. Piping drawing with the needle thread trimmer.
3
4
!1
@3
2
!1
9
9
9
!0
!0
!1
1
– 7 –
Page 10
2. Piping drawing for air blow.
3
4
@3
5
3
3
5
6
2. Adjusting the air regulator
2
Air hose
1
3
@3
A
1
2
1) Insert the air hose to air regulator 1.
2) Use the air pressure at 0.4 to 0.5 MPa (4 to 5 kgf/
cm2).
3) Draw up regulator knob 2, turn knob 2 and adjust
the pointer to 0.4 to 0.5 MPa to adjust the air pressure.
4) After the adjustment, press downward regulator
knob 2.
5) When drainage is collected at section A of regulator 1 during using, press drain cock 3 to discharge the drainage.
– 8 –
Page 11
%
. THREADING THE MACHINE HEAD
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. If threading is wrong,
stitch skipping, thread breakage, needle breakage or irregular stitches will be caused. So, be careful.
Thread the machine head according to the following threading illustrations.
2
1
* For the adjustment procedure other than the above, refer to the Instruction Manual for MF-7500.
When the thread tension located in the face plate section is used for the machine with automatic
thread trimmer, the length of needle thread remaining on the needle is shortened and slip-off of the
thread at the start of sewing may occur.
12
– 9 –
Page 12
^
. ADJUSTING THE LOOPER THREAD TRIMMER MECHANISM
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. In addition, cut the air
supply from air compressor.
1. Adjusting the thread trimmer
air cylinder
2
1
3
18 mm
1) Stroke of air cylinder 3 is 18 mm.
When adjusting the stroke, loosen setscrew 2 of
collar 1 and move collar 1 to the right or left to
adjust.
– 10 –
Page 13
2. Adjusting the Lower knife
4
0.5 mm
4
65.5 mm
2.5 ± 0.5 mm
!0
8
7
6
5
9
1) Set lower knife
setscrews 6 at the position of the illustration.
and lower knife holder 5 with
4
3. Adjusting the position of clampAdjusting the position of clamp
pressure adjusting spring
1) Loosen screws
2) Adjust so that a clearance of 2.5 ± 0.5 mm is provided between the top end of clamp pressure adjusting spring !2 and the top end of lower knife 4
when the lower knife 4 is brought to the rightmost
position.
3) After the adjustment, tighten screws
9
.
.
9
4. Adjusting the knifeAdjusting the knife
engagement and the knife
pressure adjusting spring
1) Loosen screws
of upper knife !0 so that the engagement of the
upper knife !0 with the lower knife is 0.5 mm when
lower knife 4 moves to the extreme right.
2) At the same time, adjust so that a clearance of 0.5
to 1 mm is provided between knife pressure adjusting spring !1 and clamp pressure adjusting spring
.
!2
3) After the adjustment, tighten screws
and 8, and adjust the position
7
.
7
4
!2
5. Adjusting the pressure of
clamp spring
!1
1) The looper thread is held by clamp pressure adjusting spring !2 after thread trimming.
2) Holding pressure of the looper thread can be adjusted by turning screw 8.
3) When screw 8 is turned clockwise, the holding
pressure is increased and turned counterclockwise,
the pressure is decreased.
4) Make the holding pressure as low as possible
within the range of holding the looper thread.
Clearance of 0.5 to 1 mm
!1
!2
– 11 –
Page 14
4
6. Initial position of the looper
thread trimmer mechanism
When the lower knife 4 is located at its leftmost position, the top end of the lower knife 4 has to be spaced
22 ± 0.5 mm from the center of needle bar.
Center of needle
bar
22 ± 0.5 mm
!3
!4
1 mm
to 1 mm
0.3 to 1 mm
!2
7. Adjusting the stopper
Check the leftmost point with the pneumatic device
turned on. Adjustment should be carried out with the air
pressure set at 0.5 MPa.
Adjust the position of stopper !4 so that a clearance of
0.3 to 1 mm is provided between looper !3 and clamp
pressure adjusting spring !2 when the counter knife is
located at its leftmost position (forward end).
8. Adjusting the height of the
lower knife
When the needle bar advances from its upper dead
point by 15º, the clearance of 0 to 0.1 mm has to be
provided between the undersurface of lower knife 4
and the top surface of looper !3.
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
!3
4
0 to 0.1 mm
– 12 –
Page 15
Blade point of lower knife is in the
center of thickness of looper.
!3
!5
4
5
9. Adjusting the longitudinal
position of the blade point of
lower knife
1) Advance the needle bar by 15º from its upper dead
point.
2) Adjust so that the blade point of lower knife 4 is
placed at the center of thickness of the looper !3
when the lower knife !3 is projected until its top
end is aligned with the end face of the looper !3.
3) Loosen nut
fro, and adjust the position of the blade point of
lower knife 4.
4) After the adjustment, tighten nut
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
, move lower knife holder 5 to and
!5
.
!5
!7
!6
!8
@2
3
@3
10. Adjusting the thread trimmer
sensor
The safety switch is installed so that the sewing machine does not start unless the looper thread trimmer
device returns to its home position.
1) Loosen setscrews
2) Adjust switch plate
mer sensor !8 lights up in the state that the thread
trimmer device is fully returned to its home position.
3) Tighten setscrews
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
.
!6
so that LED of thread trim-
!7
.
!6
11. Adjusting the speed of
looper thread trimmer
Speed of the looper thread trimmer device can be changed
with speed controllers
1) When you desire to change the protruding speed of
lower knife, loosen the nut of speed controller @2,
and turn the adjustment screw.
When you desire to change the returning speed of
lower knife, loosen the nut of speed controller @3,
and turn the adjustment screw.
2) After the adjustment, tighten the nuts of speed controllers @2 and @3.
@2
and
@3
of air cylinder
3.
– 13 –
• When the protruding speed of lower knife is
slow, thread trimming failure will be caused.
• When the returning speed of lower knife is
fast, lower thread clamp failure or uneven
needle thread remaining length will be
caused.
Page 16
&
. ADJUSTING THE THREAD RELEASE MECHANISM
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. In addition, cut the air
supply from air compressor.
*A
Clearance between click and disk is 0.2 to 0.5 mm.
(5 places)
9
7
4
1
2
3
5
!0
35 ± 1 mm
*A
6
8
1. Adjusting the disk-rise
1) Loosen setscrew
adjustment cam 1 and disk-rise plate 3 moves up
or down.
2) Adjust the clearance between the click section of
disk-rise plate 3 and thread tension disk 4 to 0.2
to 0.5 mm, and tighten setscrew 2.
3) If the click section of disk-rise plate 3 comes in
contact with thread tension disk 4, sewing trouble
will be caused. So, be careful.
in adjustment cam 1, turn
2
2. Adjusting the thread release
hook
1) Loosen setscrew 5. Adjust so that the top end of
tension release rod 6 is spaced 45 ± 1 mm from
the top end of take-up thread guide 7. Then,
tighten setscrew 5.
2) Loosen setscrew 9, move the position of thread
release hook 8 up or down, and the thread
remaining length at the start of sewing can be adjusted.
• When the position of thread release hook 8 is
raised, the thread remaining length at the start
of sewing is decreased and when it is lowered,
the thread remaining length at the start of sewing is increased.
• If stitch skipping occurs at the beginning of
sewing when using non-elastic thread, properly
adjust the remaining length of top-covering
thread at the start of sewing using setscrew !0
and minimize the remaining length of looper
thread at the start of sewing using screw !1.
!1
When the thread remaining length at the start
of sewing is short, stitch skipping or slip-off
of thread from needle eyelet at the start of
sewing is apt to occur.
– 14 –
Page 17
*
ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM
.
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. In addition, cut the air
supply from air compressor.
1. Adjusting the engagement of
knives
1) Adjust so that the engagement of xed knife 1
1
2
8
!0
0.5 mm
3
!2
4
5
7
6
with moving knife
2) When adjusting the engagement, loosen setscrews
and move knife holder 5 up or down to adjust.
4
2. Adjusting the pressure of
clamp spring
1) Top covering thread is held with clamp spring
after thread trimming.
2) Holding pressure can be adjusted by loosening nut
and turning screw 7.
6
3) Holding pressure is increased when tightening
screw 7 and it is decreased when loosening screw
.
7
4) After the adjustment, tighten nut
5) Make the holding pressure as low as possible
within the range of holding the top covering thread.
is 0.5 mm.
2
6
.
3
!1
9
2
9
2
0.5 mm
3. Adjusting the position of the
blade point of moving knife
1) Bring the needle bar to its highest position.
2) When hinge screw
lowers together.
3) Adjust so that the hook of moving knife
the recess in the top face of spreader 9 to be
brought to the position where the moving knife
catches the top covering thread when moving
knife 2 is brought to the lowermost position. Then,
tighten screws !0, !1 and !2.
Adjust the moving knife vertically so that a clear-
ance of 0.5 mm is provided between the recess
section of spreader 9 and the moving knife, and
laterally so that the moving knife 2 is brought to
the center of the width of recess in spreader, as
illustrated in Figure
4) Screws
knife, screws !0 for adjusting lateral position of
the knife, and screws !1 for adjusting angle of the
knife.
are for adjusting vertical position of the
!2
Make sure that the moving knife does not
interfere with other components such as
presser, needle, spreader, etc. within the
working range of moving knife 2.
is lowered, moving knife
8
2
.
A
enters
2
Fig. A
– 15 –
Page 18
3
2
1
4. Adjusting the speed ofAdjusting the speed of
moving knife
Stroke of air cylinder 1 is 20 mm.
Speed of the moving knife can be changed with speed
controllers 2 and 3.
1) When you desire to change the protruding speed
of moving knife, loosen the nut of speed controller
and turn the adjustment screw.
2
When you desire to change the returning speed of
moving knife, loosen the nut of speed controller 3
and turn the adjustment screw.
2) After the adjustment, tighten the nuts of speed controllers 2 and 3.
When the protruding speed of moving
・
knife is slow, thread trimming failure will
be caused.
When the returning speed of moving knife
・
is fast, needle thread clamp failure will be
caused.
– 16 –
Page 19
(
ADJUSTING THE AIR-BLOW WIPER (ACCESSORIES)
.
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. In addition, cut the air
supply from air compressor.
1. Installing the air-blow wiperInstalling the air-blow wiper
2. Adjusting the air-blow wiper
3
2
1
1) When using air-blow wiper
ering thread trimmer device.
2) Tighten air-blow wiper
3) Perform piping referring to
DRAWING” p.7
Adjust the air-blow position of air-blow wiper 1.
1) Adjust so that the air outlet of air-blow wiper 1 is
positioned in the rear of needle and slightly on the
lower side of needle eyelet of the left needle when
the needle bar is in the highest position.
2) After the adjustment, temporarily tighten setscrews
.
2
3) Supply air from the air compressor and turn the
power ON.
4) When the back part of the pedal of sewing machine
is depressed, the presser goes up and simultaneously air blows from air-blow wiper 1. Re-adjust
the position of air-blow wiper 1 so that air blows
only to the needle thread in the rear of the needle
eyelet.
5) After the re-adjustment, tighten setscrews
.
, remove the top cov-
1
with setscrews 2.
1
“$. AIR PIPING
2
.
– 17 –
• When air blows in front of the needle,
needle thread slips from the needle eyelet.
So, be careful.
• Adjust the air-blow strength with speed
controller 3.
•
Handwheel may rotate up to the xed position
when turning ON the power. So, be careful.
Page 20
)
. MAINTENANCE
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. In addition, cut the air
supply from air compressor.
1. Cleaning the motor fan
1
2
3
Open the motor cover
Clean up the periphery of the motor fan 3 and the motor cover 1.
After the completion of cleaning, re-install the motor fan
and the motor cover 1.
3
and remove the screws 2.
1
– 18 –
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