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.
󱢶
󱢵
󱢳
󱢷
󱢶
󱢸
󱀄
󱢳
󱀇
󱢴