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MF-7500/UT35
Instruction Manual
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JUKI MF-7500/UT35, MF-7500D/UT35 Instruction Manual

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Page 1
ENGLISH
MF-7500(D)/UT35
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 ) ....................................................................2
(2) Connecting the cords ...................................................................................................................................3
(3) Setting procedure of the machine head .....................................................................................................4
(4) Setting the lower stop position of the needle bar .....................................................................................5
(5) Setting of the auto lifter function ................................................................................................................6
(6) Setting of the pedal stroke...........................................................................................................................6
$
. THREADING THE MACHINE HEAD .............................................................................7
%
. ADJUSTING THE LOOPER THREAD TRIMMER MECHANISM ..................................8
^
. ADJUSTING THE THREAD RELEASE MECHANISM ................................................12
&
. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM ....................13
*
. MAINTENANCE ...........................................................................................................14
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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)
Needle gauge 3-needle .....4.8 mm, 5.6 mm, and 6.4 mm
Differential feed ratio 1 : 0.7 to 1 : 2 (stitch length : less than 2.5 mm)
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) 312
Weight 52 kg (With solenoid 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
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)
2-needle ..... 3.2 mm and 4.0 mm
Micro-differential feed adjustment mechanism is provided. (Micro-adjustment)
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 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

1. Installation and setting SC-921

(1) Installing the SC-921 on the table ( Semi-submerged type )

Convex washer
Spring washer
Fig. A
Hexagonal nut
2
1
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 1 and the control box on the table with mounting bolts asm. 6 supplied with the unit. At this time, insert the nuts and washers supplied with the unit as illustrated in Figure A so that the support plates 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.
– 2 –
Page 5

(2) Connecting the cords

1
1) Pass cords
A
of the thread trimming solenoid,
1
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
2) Loosen screw
!4
7
6
4
B
open the cover.
!3
2
in cover 2 with a screwdriver to
B
3) Connect 14P code
coming
3
from the machine head to con­nector 6 (CN36).
4) Insert 3P cord
coming from
9
the machine head into connec-
tor !0 (CN42).
5) Insert presser foot lifter cord 2P into connector 7 (CN37).
4
6) Connect connector
coming
5
from the motor to connector 8 (CN30) on the circuit board.
7) Insert pedal sensor cable
8) Insert motor fan cord
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.
into connector !2 (CN34).
!1
into connector !4.
!3
[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.
– 3 –
Page 6

(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.
1) Call function setting No. 95.
321
4
2) The type of machine head can be
selected by pressing switch 3 (
switch 4).
* Refer to the
"MACHINE HEAD LIST"
on the separate sheet or the Instruc­tion Manual for the machine head of your sewing machine for the type of the machine head.
321
4
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.
321
4
– 4 –
Page 7

(4) Setting the lower stop position of the needle bar

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
321
4
– 5 –
Page 8

(5) Setting of the auto lifter function

WARNING : When the solenoid is used with the air drive setting, the solenoid may be burned out. So, do not mistake
the setting.
When the auto-lifter device (AK) is attached, this function makes the function of auto-lifter work.
A
B
1) Turn ON the power switch with
switch 3 held pressed.
2) "FL ON" is displayed on indicators
A
and B with a blip to make the auto lifter function effective.
3) Turn OFF the power switch, and turn ON the power switch again to return to the normal mode.
4) Repeat the operation 1) to 3), and LED display is turned to "FL OFF".
21
3
4
Then, the function of auto-lifter does not work.
FL ON : Auto-lifter device becomes effective. Selection of the auto-lifter device of solenoid drive (+33V) or of
air drive (+24V) can be performed with switch 4.
(Changeover is performed to drive power +33V or +24V of CN37.)
Solenoid drive display (+33V)
Air drive display (+24V)
FL OFF : Auto-lifter function does not work. (Similarly, the presser foot is not automatically lifted when pro- (Similarly, the presser foot is not automatically lifted when pro-
grammed stitching is completed.)
1. To perform re-turning ON of the power, be sure to perform after the time of one second or more has passed.
(If ON / OFF operation of the power is performed quickly, setting may be not changed over well.)
2. Auto-lifter is not actuated unless this function is properly selected.
3. When “FL ON” is selected without installing the auto-lifter device, starting is momentarily delayed at the start of sewing. In addition, be sure to select “FL OFF” when the auto-lifter is not installed since the touch-back switch may not work.

(6) Setting of the pedal stroke

: Lifting start position of pedal presser lifter
: Pedal stroke of thread trimming start
g
g
When using the top covering thread, per­form the setting below.
Set so that thread trimming operation
¡
can be performed before using the auto-lifter.
Set the lifting start position of the
¡
pedal presser lifter of the function set­ting No. 41 to " / " and the
pedal stroke of the thread trimming start of the function setting No. 43 to "
/ " respectively.
Occurrence of stitch skipping, thread trimming failure, or stitch trouble may be caused unless the setting is changed. So, be careful.
– 6 –
Page 9
$
. 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
– 7 –
Page 10
%
. 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.

1. Adjusting the looper thread trimmer solenoid

1) Stroke of looper thread trimmer solenoid 3 is 17.5 ± 0.5 mm. When adjusting the stroke, loosen set­screw 2 of collar 1 and move collar 1 to the right or left to adjust.
3
17.5 ± 0.5 mm
2
1
18 mm
@1
@0
2) After adjusting the stroke, loosen screw @0 from the lower side, and move collar !9 to the left and right to adjust so that the distance between rubber cush­ion @1 and UT base is 18 mm.
!9
– 8 –
Page 11

2. Adjusting the Lower knife

4
0.5 mm
4
65.5 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 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 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 4 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
2.5 ± 0.5 mm
!2
4
!1
Clearance of 0.5 to 1 mm

5. Adjusting the pressure of clamp spring

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.
!1
!2
– 9 –
Page 12
4
Center of needle bar

6. Initial position of the looper thread trimmer mechanism

When the lower knife tion, the top end of the lower knife 4 has to be spaced 22 ± 0.5 mm from the center of needle bar.
is located at its leftmost posi-
4
22 ± 0.5 mm
!3
!4
0.3 to 1 mm
!2

7. Adjusting the stopper

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 under surface 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
– 10 –
Page 13
Blade point of lower knife is in the center of thickness of looper.
!3
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 placed at the center of thickness of the looper !3 when the lower knife 4 is projected until its top end is aligned with the end face of the looper !3.
3) Loosen nut !5, move lower knife holder 5 to and fro, and adjust the position of the blade point of lower knife 4.
4) After the adjustment, tighten nut !5.
Perform the work with the needle bar at the highest position when actuating the thread trimmer mechanism by hand.
4
is
!8
!7
!5

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
!6
– 11 –
Page 14
^
. 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.
*A Clearance between click and disk is 0.2 to 0.5 mm. (5 places)
9
7
4
1
2
3
5
!0
35 ± 1mm
*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 35 ± 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.
– 12 –
Page 15
&
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.

1. Adjusting the engagement of knives

1
2
0.5 mm
3
!0
5
!2
4
7
6
8
1) Adjust so that the engagement of xed knife with moving knife 2 is 0.5 mm.
2) When adjusting the engagement, loosen setscrews
and move knife holder 5 up or down to adjust.
4
1

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.
6
.
3

3. Adjusting the position of the blade point of moving knife

!1
9
2
9
2
0.5 mm
1) Bring the needle bar to its highest position.
2) When hinge screw 8 is lowered, moving knife lowers together.
3) Adjust so that the hook of moving knife 2 enters 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.
.
A
2
Fig. A
– 13 –
Page 16
*
. 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.

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
– 14 –
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