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

ENGLISH
MF-7500(D)/UT35
INSTRUCTION MANUAL
I

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
i
!
. 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 –
#
. 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 –

(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 –
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