How it Works
JUKI
Loading...
MF-7900D/UT55
Instruction Manual
22 pgs1.35 Mb0
Table of contents
Loading...

JUKI MF-7900D/UT55, MF-7900D/UT57, MF-7900D/UT56, MF-7900/UT55, MF-7900/UT57 Instruction Manual

...
MF-7900(D)/UT55,56,57
INSTRUCTION MANUAL
No.01
2
70002031

CONTENTS

!
@
#
1. Installing the presser lifting cylinder ............................................................................................ 2
2. Installing the air regulator .............................................................................................................. 2
3. Installation and setting SC-921 ...................................................................................................... 3
(1) Installing the SC-921 on the table ( Table-mount type ) ............................................................................3
(2) Installing the SC-921 on the table ( Semi-submerged type ) ....................................................................3
(3) Connecting the cords ...................................................................................................................................4
(4) Setting procedure of the machine head .....................................................................................................5
(5) Setting the lower stop position of the needle bar .....................................................................................6
$
1. Piping of the thread trimmer device (UT57) .................................................................................. 7
2. Piping of the thread trimmer device (UT55) .................................................................................. 8
3. Piping drawing for air blow (UT56) ................................................................................................ 9
4. Adjusting the air regulator ............................................................................................................. 9
%
^
1. Adjusting the thread trimmer air cylinder ....................................................................................11
2. Adjusting the Lower knife ............................................................................................................ 12
3. Adjusting the position of clamp pressure adjusting spring ..................................................... 12
4. Adjusting the knife engagement and the knife pressure adjusting spring ............................. 12
5. Adjusting the pressure of clamp spring ..................................................................................... 12
6. Initial position of the looper thread trimmer mechanism .......................................................... 13
7. Adjusting the stopper ................................................................................................................... 13
8. Adjusting the height of the lower knife ....................................................................................... 13
9. Adjusting the lower knife holder guide ....................................................................................... 13
10. Adjusting the longitudinal position of the blade point of lower knife ...................................... 14
11. Adjusting the thread trimmer sensor .......................................................................................... 14
12. Adjusting the speed of looper thread trimmer ........................................................................... 14
&
1. Adjusting the disk-rise ................................................................................................................. 15
2. Adjusting the thread release hook .............................................................................................. 15
*
1. Adjusting the engagement of knives .......................................................................................... 16
2. Adjusting the pressure of clamp spring ..................................................................................... 16
3. Adjusting the position of the blade point of moving knife ........................................................ 16
4. Adjusting the speed of moving knife .......................................................................................... 17
(
1. Installing the air-blow wiper ......................................................................................................... 18
2. Adjusting the air-blow wiper ........................................................................................................ 18
)
1. Adjusting the clamp spring .......................................................................................................... 19
2. Installing the needle thread wiper ............................................................................................... 19
_
1. Cleaning the motor fan ................................................................................................................. 20
i
!
. SPECIFICATIONS
Model name High-speed, cylinder-bed coverstitch machine Semi-dry head, high-speed, cylinder-bed
coverstitch machine
Model MF-7900 series MF-7900D 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 .....5.6 mm and 6.4 mm
2-needle ..... 3.2 mm, 4.0 mm and 4.8 mm
Differential feed ratio 1 : 0.9 to 1 : 1.8 (stitch length : less than 2.5 mm)
Micro-differential feed adjustment mechanism is provided. (Micro-adjustment)
Stitch length 0.9 mm to 3.6 mm (can be adjusted up to 4.5 mm)
Needle
Needle bar stroke 31mm (33 mm when the eccentric pin is changed over)
Dimensions (Height) 450 x (Width) 456 x (Length) 299
Weight 45 kg (With pneumatic type thread trimmer) , 42 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 Table-mount type, Semi-submerged type
Noise - Equivalent continuous emission sound pressure level
UY128GAS #9S to #14S (standard #10S) UY128GAS #9S to #12S (standard #10S)
Main feed ............... dial type stitch pitch adjustment method
Differential feed ..... lever adjustment method (micro-adjustment mechanism is provided.)
(LpA) at the workstation: A-weighted value of 79.5 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
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)
(1 : 0.6 to 1 :1 .1, when the differential link hinge screw is changed)
Micro-lifter 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 4,000 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 2mm
2
5
9
6

2. Installing the air regulator

1) Install presser lifting cylinder asm. machine with screws washers 7.
2) Tighten screw 3 in such manner that a clearance of 1 to 2 mm is provided between cap end of presser lifting cylinder asm. lifting lever
If the clearance cannot be adjusted to 1 to 2 mm,
adjust the height of nut correct clearance between the cap and lever.
3) Adjust the height of screw 5 referring to the Instruction Manual for MF-7900 (
the presser foot lift
4) Stroke of cylinder asm. 1 is 30 mm. Make sure that presser lifting lever 2 comes in contact with screw 5 within the range of cylinder stroke.
2
.
, washers
3
and cap
8
),
and tighten nut
to the sewing
1
and spring
4
9
and presser
1
to obtain the
9
^
Adjusting
-14.
.
6
at the top
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 ( Table-mount type )

* The instructions apply to the case the control box is installed on the table of the MF-7900(D). To use any other machine head, install the control box on the table referring to the Instruction Manual for the
main body of the relevant sewing machine.
1
Fig. B
4
Fig. A
Convex washer
Spring washer
Hexagonal nut
1
6
5
6
2
1) Install control box 2 on the table with mounting bolt asm. 1 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 2 are securely xed.
2) Install the control box 2 (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.)
3) Install the mounting plate on the CP-18 panel 5 with four tapping screws 4 supplied with the unit.
At this time, take care not to allow the cable to be caught under the mounting bracket. (Install the CP-18 on the table as illustrated in Fig.
4) Install CP-18 panel 5 on the table with wood screw
.)
B
.
6

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

1) Install right and left support plates 7 and two
1
!0
8
7
!1
9
2
rubber seats
2) Install control box mounting plate 9 on the control box with four screws
3) Install the parts assembled in Step 2) on the underside of support plates 7 with four screws
.
!1
4) Install support plates 7 and the control box
on the table with mounting bolts asm. 1
2
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 2 are securely xed.
* The steps of procedure from the next one and
beyond are same with those for the table-xed
type machine head.
of the respective support plates.
8
.
!0
– 3 –

(3) 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
2) Loosen screw
7
!4
6
4
B
open the cover.
!3
2
in cover 2 with a screwdriver to
B
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).
4
6) Connect connector 5 coming from the motor to connector 8 (CN30) on the circuit board.
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 –

(4) 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 4).
* Refer to the
on the separate sheet or the
LIST"
"MACHINE HEAD
switch 3 (
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
MF-7900/UT55
F79
F79d
MF-7900/UT56
MF-7900/UT57
MF-7900D/UT55
MF-7900D/UT56
MF-7900D/UT57
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
– 5 –
Loading...
+ 15 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use