Brother EF3-K11 User Manual
Overlock Sewing Machine
K series
EF3-K11
Cylinder Bed Single Needle
Overlock Sewing Machine
EF3-K21
Cylinder Bed Twin Needle
Overlock Sewing Machine
2000.7
EF3-K11, K21 1/7
Specifications
Sub-class
Applications
Stitch width
Sub-class
Applications
Stitch width
EF3-K11 - / /
Sub −class Stitch width Device
Stitch type No. of
−3
--4
02
−5
−3
04
−4
−5
−3
12
−4
−5
52 −4
Blind
hemming
Elastic tape
attaching
needles
1 3
1 3 −
1 3 −
1 2 − 4 0.8– 3.7 0.8 – 1.8
threads
EF3-K21 - / /
Sub −class Stitch width Device
No. of
Needle
gauge
(mm)
−
(mm)
3
4
5
3
4
5
3
4
5
Max. stitch
length
(mm)
0.8– 3.7 0.8 – 1.8
0.8– 3.7 0.8 – 1.8
0.8– 3.7 0.8 – 1.8
Differential
ratio
03
04
92
-5
-6
-7
-5
-6
-7
-4
-5
Versatile
sewing
Stitch type No. of
needles
2 4 2
2 4 2
2 4 2
No. of
threads
Needle
gauge
(mm)
(mm)
5
6
7
5
6
7
4
5
Max. stitch
length
(mm)
0.8– 3.7 0.8 – 1.8
0.8– 3.7 0.8 – 1.8
0.8– 3.7 0.8 – 1.8
Differential
ratio
··· Light-weight materials ··· Heavy-weight materials
··· Medium-weight materials ··· Extra heavy-weight materials
Note: Changing specifications between standard, high lift and super− high lift requires a large number of part replacements.
Device Model
Pneumatic presser foot lifter PL1
Pneumatic vertical chain cutter
Metering and inserting device with
tape cutter
Automatic tape feeder Vertical type TFV
Chain cutter and dust box CV1
Chain cutter only CV7
MC3
K11−02, 04, 12
K21−03, 04, 92
K11−02, 04, 12
K21−03, 04, 92
K11−52
K11−52
EF3-K11, K21 2/7
2000.7
Height of
presser foot
feed dog
(standard)
Needle size
Max. speed
Attachment
presser foot
(standard)
Needle size
Max. speed
(mm)
5 1.6 3 - Row 9 8,500 S
7 1.6 3 - Row 11 6,500 S H
Pitch of
(mm)
Type of feed
dog
(DC x 27)
(rpm)
Looper
locus
5.5 1.6 2 - Row 9 8,500 S
5.5 1.6 3 - Row 9 7,000 H MC3 device
Height of
(mm)
5.5 1.6 3 - Row 9 7,500 H
7 1.6 3 - Row 11 6,500 SH
Pitch of
feed dog
(mm)
Type of feed
dog
(DC x 27)
(rpm)
Looper
locus
Blind
hemming
ruler
Attachment
5.5 1.6 2 - Row 9 8,000 S
Over- looper locus: S Standard lift
H High lift
SH Super high lift
2000.7
Cloth plate
Blind hemming
ruler
EF3-K11, K21 3/7
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