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12. MF-7900/UT59
(1) Specifications
(2) At the beginning
Model name
High-speed, cylinder-bed coverstitch machine
Model
MF-7900 series
Stitch type
ISO standard 406, 407, 602, and 605
Example of application For preventing thread from raveling at the end of hemming or other processes
Sewing speed
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, 6.4 mm
2-needle 4.0 mm, 4.8 mm
Differential feed ratio
1 : 0.9 to 1 : 1.4 (stitch length : less than 2.5 mm) * Only for H23
(1 : 0.6 to 1 :1 .1, when the differential link hinge screw is changed)
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
UY128GAS #9S to #12S (standard #10S)
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)
Lift of presser foot
8 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering)
Micro-lifter mechanism is provided.
Feed adjustment meth-
od
Main feed : dial type stitch pitch adjustment method
Differential feed : lever adjustment method (micro-adjustment mechanism is pro-
vided.)
Looper mechanism
Spherical rod drive method
Lubricating system
Forced lubrication method by gear pump
Lubricating oil
JUKI CORPORATION 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 (L
pA
) at the workstation:
A-weighted value of 79.5 dB; (Includes K
pA
= 2.5 dB); according to ISO 10821-
C.6.2 -ISO 11204 GR2 at 4,500 sti/min.
Remove fixed band
❶
for transportation before set-
ting up the sewing machine.
❶
