JUKI MF-7900-E22 User manual

MF-7900-E22,23
INSTRUCTION MANUAL

i
CONTENTS
I. SPECIFICATIONS.............................................................................................................1
II. IN CASE OF USING E22 .................................................................................................1
1.Installing procedure ..................................................................................................................... 1
2.Adjustment procedure ................................................................................................................. 5
III. IN CASE OF USING E23 ................................................................................................6
1.Installing procedure ..................................................................................................................... 6
2.Adjustment procedure ................................................................................................................. 8
IV. WITH REGARD TO THE ACCESSORIES (TENSION ROLLER) ..................................9
1.Installing procedure ..................................................................................................................... 9
2.Adjustment procedure ............................................................................................................... 10
V. DRAWING OF THE TABLE ...........................................................................................12

– 1 –
II. IN CASE OF USING E22
1. Installing procedure
1) Installing the binder close/open knee switch
Install the binder close/open knee switch under the
machine table with wood screws 󰿿.
󰿿
I. SPECIFICATIONS
Model MF-7900-E22, MF-7900-E23
Model name E22 : Machine for attaching endless spandex elastic tape
(With manual open/close type binder)
E23 : Machine for attaching endless spandex elastic tape
(With pneumatic open/close type binder)
Sewing speed Max. 5,000 sti/min (at the time of intermittent operation) (provided with PL12 or 13)
Speed of stitch at the delivery. 4,000 sti/min (at the time of intermittent operation)
(provided with PL12 or 13)
Needle gauge 3-needle 5.6mm, 6.4mm
Differential feed ratio 1 : 0.6 to 1 : 1.8 (Stitch length less than 2.5 mm)
Provided with micro differential feed adjustment mechanism (Micro-adjust)
Stitch length 0.9 to 3.6 mm (Adjustable up to 4.5 mm)
Binder open/close amount 40mm
Needle bar stroke 33mm (35 mm in the case the eccentric pin is changed over)
Noise -
Equivalent continuous emission sound pressure level (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.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

– 2 –
2) Installing the binder open/close device
Fit spacer 󱀀and install binder open/close device 󱀁
with screws (plus-minus screw, black, screw shank
length 8 mm) 󱀃.
Readjust screws 󱀃when the device does
not return smoothly.
Loosen the screw 󱢻in collar 󱀂. Adjust the spring
pressure of the binder open/close device. After the
installation of the open/close device, apply grease
(exclusive grease; JUKI part number: 13525506)
supplied with the device to B section.
3) Installing the lever
Install lever asm. 󱀄with screws (Slotted screw,
black, screw shank length 14 mm) 󱣂.
Apply the grease supplied with the machine to the
contact section A of lever asm. 󱀄.
Conrm that there is a clearance at section
A after installing the lever asm.
4) Installing the binder and the elastic guide
Install binder 󱀅and elastic guide 󱀆.
󱀆
󱀅
󱀁
󱀀
󱀂
B
󱀃
󱢻
󱀄

󱣂

– 3 –
5) Installing the chain and pulley
Install chain for binder open/close 󱀇to lever asm. 󱀄
with S-hook 󱢳. Suspend the chain through hole 󱢴
in the table. Adjust the longitudinal position of roller
asm. 󱢶 so that the chain ts in the roller groove. Fix
the roller asm. with wood screw 󱢵.
When the chain is installed in the state that the
position of the groove of the roller and the chain
is not proper, abnormal friction of the chain
occurs. So, install the chain with care.
6) Connecting the chain
After installing roller asm. 󱢶, t the chain to the groove
of the roller, put S-hook 󱢳in the top-end hole of open/
close lever 󱢷, and connect the chain.
Adjust the longitudinal position of lever block 󱢸
so that the chain smoothly ows in the groove of
the roller when open/close lever 󱢷works.
󱢶
󱢵
󱢳
󱢷
󱢶
󱢸
󱀄
󱢳
󱀇
󱢴

– 4 –
󱢹
󱢺
󱢽
󱢾
󱢼
󱢻
7) Installing the AK solenoid cord
Install AK solenoid cord 󱢹 as illustrated in the gure.
Route the cord behind presser bar lifting lever 󱢺.
If the cord is routed in front of the lever, the
cord can be caught under lever 󱢺, resulting
in a breakage of the cord.
Fix the cord with cord band 󱢻. Pass the cord between
thread trimming sensor 󱢼and the frame.
Fix the cord with cord bands 󱢽and 󱢾(two locations) on
the side face of the solenoid bracket.

– 5 –
2) Adjusting the open/close amount of the binder
Adjust the open/close amount of the binder with collar
󱣁.
2. Adjustment procedure
1) Adjusting the position of the binder
Perform the adjustment of the position of binder 󱢿
with screws 󱣀.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
󱣀
󱢿
󱣁

– 6 –
III. IN CASE OF USING E23
1. Installing procedure
1) Installing the binder open/close knee switch asm 󰿿
under the table with wood screws 󱀀.
󱀀
󰿿
2) Installing the binder open/close device
Place spacer 󱀁and install binder open/close device
󱀂. Insert air tubes 󱀄into joints 󱀅of binder open/close
knee switch asm. Fix air tube 󱀄with air tube holder
󱀃.
󱀁
󱀂
󱀃
󱀅
󱀄
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

– 7 –
3) Installing the binder and the elastic guide
Install binder 󱀇and elastic guide 󱢳.
󱀇
󱢳
4) Installing the air regulator
Install air regulator asm.󱢴under the table with
wood screws 󱢵.
󱢵
󱢴

– 8 –
2. Adjustment procedure
1) Adjusting the position of the binder
Perform the adjustment of the position of binder 󱀇
with screws 󱢶.
󱢶
󱀇
2) Adjusting the open/close amount of the binder
Adjust the open/close amount of the binder with collar
󱢷.
󱢷
3) Adjusting the speed of open/close of the binder
The speed of open/close of binder 󱀇can be changed
with speed controllers 󱢸and 󱢹. When you desire to
change the opening speed of binder 󱀇, loosen the nut
of speed controller 󱢸located on the machine side and
turn the adjustment screw. When you desire to change
the closing speed of binder 󱀇, loosen the nut of speed
controller 󱢹located on the operator side and turn the
adjustment screw. After the adjustment, tighten the nut
of the speed controller.
4) Adjusting the air regulator
1. Insert the air hose to air regulator 󱢺.
2. Use the air pressure at 0.4 to 0.5 MPa (4 to 5 kgf/cm2).
3. Draw up regulator knob 󱢻, turn knob󱢻and adjust the
pointer to 0.4 to 0.5 MPa to adjust the air pressure.
4. After the adjustment, press downward regulator knob
󱢻.
5. When drainage is collected at section A of regulator
󱢺during using, press drain cock 󱢼to discharge the
drainage.
Air hose
󱢺
󱢻
󱢼
A
󱢸
󱢹
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

– 9 –
1) Installing the bottom roller of the tension roller
Install bottom roller plate 󰿿with three wood screws
󱀀.
For the installing position of the bottom roller
plate, refer to the drawing of the table.
󱀀
󰿿
IV. WITH REGARD TO THE ACCESSORIES (TENSION ROLLER)
1. Installing procedure
2) Installing the slide shaft under the table
1. Fix slide bases 󰿿with wood screws 󱀀(2 pcs. each)
respectively.
For the installing position of the slide
base, refer to the drawing of the table.
2. Loosen knobs 󱀁, enter slide shaft 󱀂to slide bases
󰿿, adjust the slide bases so that the slide shaft moves
smoothly, and tighten wood screws 󱀀.
Place downward the at plane of the slide shaft so that
the knobs can be xed.
3. Enter block asm. 󱀃to slide shaft 󱀂, and tighten screw
󱀄(M8).
󰿿
󱀀
󱀁
󱀂󱀃
󱀄
3) Installing the front roller
1. Enter front roller vertical shaft 󰿿to block asm. 󱀀, and temporarily
tighten clamp lever 󱀄.
2. Enter bracket 󱀂to front roller vertical shaft 󰿿, and x it with screws
󱀁 (M6). At this time, adjust the at plane of front roller vertical shaft
󰿿to screws 󱀁.
3. Enter front roller asm. 󱀃to bracket 󱀂, and x it with screws 󱀅(M6).
4. Adjust the direction of front roller asm. 󱀃so that it is parallel to the
sewing machine, and tighten clamp lever 󱀄.
󰿿
󱀀
󱀄
󱀁
󱀂
󱀅
󱀃
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

– 10 –
4) Installing the rear roller
1. Fix rear roller plate base 󰿿with three wood screws 󱀀.
For the installing position of the rear roller
plate base, refer to the drawing of the table.
2. Install rear roller asm. 󱀁to rear roller plate base 󰿿
with screw 󱀂(M8), washer 󱀃and clamp lever 󱀄.
󰿿
󱀀
󱀁󱀂󱀃󱀄
1) Adjusting the lateral position
Adjust the position so that the right-hand end of the
elastic band ts collar 󰿿of the front roller when placing
the elastic band straight to the front roller.
1. Loosen screw 󱀀, adjust collar 󰿿to the position of
the right-hand end of the elastic band, and tighten the
screw.
Do not excessively tighten screw 󱀀.
Deformation of the collar will be caused.
2. Adjustment procedure
Elastic band
󱀀
󰿿
2) Adjusting the vertical position
Loosen clamp lever 󰿿, and adjust the height of front roller 󱀀. Adjust the
position in accordance with the length of the elastic band, and tighten
clamp lever 󰿿.
󰿿
󱀀
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.

– 11 –
3) Adjusting the longitudinal position
1. Loosen knobs 󱀀of slide shaft 󰿿, and adjust the lon-
gitudinal position.
2. After adjusting the position, tighten knobs 󱀀.
󰿿
󱀀
4) Adjusting the position of the bottom roller
1. Adjusting the lateral position
Loosen three screws 󰿿, adjust the bottom roller so
that the elastic band is put straight, and tighten three
screws 󰿿.
2. Adjusting the vertical position
Loosen clamp lever 󱀀, adjust the position so that the
elastic band is appropriately in accordance with the
length of it, and tighten clamp lever 󱀀.
󰿿
󱀀
5) Adjusting the position of the rear roller
1. Adjusting the longitudinal and vertical positions
Loosen clamp lever 󰿿, adjust the position so that the
elastic band is appropriately tense in accordance with
the length of it, and tighten clamp lever 󰿿.
󰿿

– 12 –
V. DRAWING OF THE TABLE
70003387 MF-7900-E11/E22/E23 For the direct-driven machine head
󱤨4 x ø3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.) 󱤩3 x ø3.8 on the top surface, depth 10 (Drill a hole at the time of set-up.) (Rear roller mounting base hole) 󱤪
Drilled hole 17
󱤫7 x ø3.8 on the bottom surface, depth 10 (Bracket mounting hole) 󱤬2 x ø3.4 on the bottom surface, depth 10 (Drill a hole at the time of set-up.)
󱤨󱤩󱤪
󱤫
󱤬
Z-Z (3places)

– 13 –
70003388 MF-7900-E11/E22/E23 For V belt
󱤨󱤩
󱤪
󱤫
󱤬
󱤭
󱤮
󱤯
󱤰
󱤨4 x ø3.4 on the bottom surface, depth 20 (Table-stand installing position) 󱤩4 x ø3.8 on the top surface, depth 10 (Drill a hole at the time of set-up.) 󱤪
Drilled hole 17
󱤫5xø20 (Passing through)󱤬ø50 (Passing through)
󱤭3 x ø3.8 on the bottom surface, depth 10(Bracket mounting hole) 󱤮2 x ø3.8 on the bottom surface, depth 10(Bracket mounting hole) 󱤯2 x ø3.8 on the bottom surface, depth 10(Bracket mounting hole) 󱤰2 x ø3.8 on the bottom surface, depth 10(Pushbutton switch mounting position)
Y-Y (3places)