JUKI DDL-5550N Handbook page 88

High-speed, Cylinder-bed, Top and Bottom Coverstitch Machine
with Pneumatic Top and Bottom Thread Trimming Device
MF-7822/UT25
(2-needle, top and bottom coverstitch machine)
MF-7823/UT25
(3-needle, top and bottom coverstitch machine)
● The quality-first cylinder-bed coverstitch machine now comes
with a pneumatic thread trimmer. It offers dramatically
improved thread trimming performance and reliability to
achieve consistent thread trimming, thereby contributing to
increased productivity.
SPECIFICATIONS
Model name
Stitch type
Needle
Stitch pitch adjustment
Differential feed adjustment
Lubrication
Lubricating oil
Top and bottom thread trimmer
Auto-lifter
Micro-lifter
Needle bar stroke converting function
Silicon oil tank for needle tip and
needle thread
Cartridge oil filter
Weight of the machine head
The needle bar stroke has been factory-set to 31mm as standard. 33mm for thicker material also be available by simple adjustment. (max. sewing speed: 5,500rpm)
SUBCLASS MACHINE LIST
Subclass machines
Seams
U10
Basic stitch (universal type)
K10
Covering
1 Stitch length can be adjusted to 4.5mm at the maximum.
MF-7822/UT25
2-needle top and bottom
coverstitch
UY128GAS #9S #14S (standard #10S)
By dial
By micro-adjustment mechanism
Automatic
JUKI Machine Oil 18 (equivalent to ISO VG18)
Provided as standard (pneumatic type)
Provided as standard (pneumatic type)
Provided as standard
Provided as standard
Provided as standard
Provided as standard
44kg
Model No. Number of Number of
needles threads
MF-7822-U10-B48 2
MF-7823-U10-B56 3
MF-7823-U10-B64 3
MF-7823-K10-B56 3
2 Differential ratio can be switched by adjustment.
MF-7823/UT25
3-needle top and bottom
coverstitch
1
Needle gauge Stitch Differential-
(mm) length (mm) feed ratio
1:0.9 1:1.8
4 4.8 0.9 3.6
(1:0.6 1:1.1)
1:0.9 1:1.8
5 5.6 0.9 3.6
(1:0.6 1:1.1)
1:0.9 1:1.8
5 6.4 0.9 3.6
(1:0.6 1:1.1)
1:0.9 1:1.8
5 5.6 0.9 3.6
(1:0.6 1:1.1)
3 5mm with top coverstitch, 8mm without top coverstitch.
MF-7822/UT25, MF-7823/UT25 (August, 2004) 1/2
MF-7823U10B56/UT25
Pneumatic top and bottom Pneumatic top and bottom
thread trimming mechanism thread trimming mechanism
Part No.134-42058
By using an air-blow nozzle
included in the accessary box
needle threads are blown at
the end of bottom coverstitch.
2 3
Presser lifting Max. sewing
amount (mm) speed (rpm)
5(8) 6,500
5(8) 6,500
5(8) 6,500
5(8) 6,500
5
Device
UT25
UT25
UT25
UT25