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MF-7500/UT37
Instruction Manual
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JUKI MF-7500/UT37, MF-7500D/UT37 Instruction Manual

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Page 1
ENGLISH
MF-7500(D)/UT37
INSTRUCTION MANUAL
I
Page 2

CONTENTS

!
. SPECIFICATIONS ..........................................................................................................1
@
. AT THE BEGINNING ......................................................................................................1
#
. INSTALLING THE ACCESSORIES ...............................................................................2
(1) Installing the SC-921 on the table ( Semi-submerged type ) .............................................. 3
(2) Connecting the cords ............................................................................................................ 4
(3) Setting procedure of the machine head ............................................................................... 5
(4) Setting the lower stop position of the needle bar ............................................................... 6
$
. AIR PIPING DRAWING ..................................................................................................7
%
. THREADING THE MACHINE HEAD .............................................................................9
^
. ADJUSTING THE LOOPER THREAD TRIMMER MECHANISM ................................10
&
. ADJUSTING THE THREAD RELEASE MECHANISM ................................................14
*
. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM ....................15
(
. ADJUSTING THE AIR-BLOW WIPER (ACCESSORIES) ...........................................17
)
. MAINTENANCE ...........................................................................................................18
i
Page 3
!
. SPECIFICATIONS
Model name High-speed, at-bed coverstitch machine
Model MF-7500 series MF-7500D series
Stitch type ISO standard 406, 407, 602, and 605
Example of applica­tion
Sewing speed Max. 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 gauge 3-needle .....4.8 mm, 5.6 mm, and 6.4 mm
2-needle ..... 3.2 mm and 4.0 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
Needle UY128GAS #9S to #14S (standard #10S) UY128GAS #9S to #12S (standard #10S)
Needle bar stroke 31 mm (33 mm when the eccentric pin is changed over)
Dimensions (Height) 451 x (Width) 523 x (Length) 279
Weight 49 kg (With pneumatic type thread trimmer) , 46 kg
Lift of presser foot 8 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering)
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
Noise - Equivalent continuous emission sound pressure
Main feed ............... dial type stitch pitch adjustment method
Differential feed ..... lever adjustment method (micro-adjustment mechanism is provided.)
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 4,500 sti/min.
Hemming and covering for knits and general knitted fabrics
1.2 mm to 3.6 mm (can be adjusted up to 4.4 mm)
Micro-lifter mechanism is provided.
Semi-dry head, high-speed, at-bed coverstitch machine
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.
4321
Type of machine head Model name
F75
F75d
MF-7500/UT35 MF-7500/UT37 MF-7500D/UT35 MF-7500D/UT37
3) After selecting the type of machine
head, by pressing switch
1
(
switch 2), the step proceeds to
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.
1 2
– 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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