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MF-7500/UT37
Instruction Manual
20 pgs1.21 Mb0
Table of contents
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JUKI MF-7500/UT37, MF-7500D/UT37 Instruction Manual

ENGLISH
MF-7500(D)/UT37
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 ) .............................................. 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
!
. 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 –
#
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 –

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 –

(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 –
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