Brother EF4-N21 User manual

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 1/31
2001.9
Overlock Sewing Machine
N series
EF4-N11
High Speed Single Needle
Overlock Sewing Machine
EF4-N21
High Speed Twin Needle
Overlock Sewing Machine
MA4-N31
High Speed Safety Stitch
Sewing Machine

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 2/31 2001.9
Overlock Sewing Machine
V series
EF4-V41A
Ultra high Speed Single Needle
Overlock Sewing Machine
EF4-V51A
Ultra high Speed Twin Needle
Overlock Sewing Machine
MA4-V61A
Ultra high Speed Safety Stitch
Sewing Machine

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 3/31
2001.9
Option parts [Models EF4-N11, N21,MA4-N31, V41A, V51A, V61A]
Model
Device N11 V41A N21 V51A N31 V61A
Stitch number control ATC1 {{{
Air suction + Thread release + Stitch number control ATC3 {{{ Automatic tape cutter Air suction + Stitch number control ATC5 {{{
Horizontal (Installed on the table) TFH {{{
Automatic tape feeder Vertical (Installed on the table) TFV {{{
For single needle SBL1 {--
Semi-auto backtack device For twin needle SBL2 - {-
Pneumatic type back suction CV1 {{ -
Pneumatictypefrontsuction CV3 {{ -
Vacuum type back suction CV4 {{ -
Vacuum type front suction CV6 {{ -
Chaincutteronlybacksuction CV7 {{ -
Verticalchaincutter
Chaincutteronlyfrontsuction CV9 {{ -
Pneumatictype CH1 {{{
Vacuum type CH2 {{{
Horizontal chain cutter Chaincutteronly CH3 {{{
Knee SW pneumatic TC1 {{{
Knee SW solenoid TC3 {{{ Tape cutter Manual SW solenoid TC5 {{{
Pneumatic foot lifter PL1 {{{
Folded edge controlling and hemming BH {--
Pneumaticaircleanerset CL1 {{{
Semi-automatic backlatch device SBL {{ -

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 4/31 2001.9
Specifications
EF4-N11- - / / /
Sub−class Stitchwidth Device
Sub-class Applications Stitchtype No.of
needles No.of threads
(mm)
Needle
gauge
(mm)
Stitch width
(mm)
Max. stitch
length
Differential
ratio
01 -3
-4
-5
-6
-7
13-
3
4
5
6
7
0.9 – 3.8 0.7 – 2.0
02 -5
-6
-7 Bulky knit 13-5
6
70.4 – 2.4 1.1 – 3.8
03 -3
-4
-5 Blind-hemming 13-3
4
50.9 – 3.8 0.7 – 2.0
04 -3
-4
-5 Blind-hemming 12-3
4
50.9 – 3.8 0.7 – 2.0
05 -4
-5 Serging 12-4 51.4 – 5.9 0.7 – 1.3
06 -4
-5 Serging 13-4 51.4 – 5.9 0.7 – 1.3
07 -2
-3 Curing 13-2 30.9 – 3.8 0.7 – 2.0
08
-5 Ruffling 1 3 - 5 0.8 – 3.2 0.8 – 2.8
09
-5 Ruffling
with piping 1 3 - 5 0.8 – 3.2 0.8 – 2.8
10 -4
-5
-6 Taping 13-4
5
60.9 – 3.8 0.7 – 2.0
11 -5
-6
-7
Taping
bulkyknit 13-5
6
70.4 – 2.4 1.1 – 3.8
12 -3
-4
-5 Back-tacking 13-3
4
50.9 – 3.8 0.7 – 2.0
17 -3
-4
-5 Soft chain
stitching 13-3
4
50.9 – 3.8 0.7 – 2.0
··· Light-weight materials ···Heavy-Weightmaterials
··· Medium-weight materials ··· Extra heavy-weight materials

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 5/31
2001.9
EF4-V41A- - / / /
Sub−class Stitchwidth Device
(rpm)
Max. speed
(mm)
Height of
presser foot
(mm)
Pitch of feed
dog
Type of feed dog
(standard) (DC x27) Needlesize V41A N11 Looper locus Attachment
51.63-Row11
8,500
8,500
8,500
8,000
8,000
7,000
7,000
7,000
6,700
6,700
S
S
S
H
H
6 2.5 3 - Row 14 8,000 6,500 H Angle knife
5 1.6 2- Row 9 8,500 7,000 S Blindhemming
ruler
5 1.6 2- Row 9 8,500 7,000 S Blindhemming
ruler
5 1.6 2- Row 14 8,500 7,000 S Serging ruler
5 1.6 2- Row 14 8,500 7,000 S Serging ruler
5 1.6 2- Row 11 8,500 7,000 S
5 1.6 3- Row 11 7,500 6,500 S Ruffler
5 1.6 3 - Row 11 7,500 6,500 S Piping ruffler
51.63-Row11
8,500
8,500
8,000
7,000
7,000
6,700
S
S
HTape guide
6 2.5 3- Row 14 8,000 6,500 H Tape guide
Angle knife
5 1.6 2- Row 11 8,500 7,000 S Back-tack
5 1.6 3- Row 11 8,500 7,000 S
Over-looper locus
S ··· Standard lift
H ··· High lift
E ··· Extra high lift

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 6/31 2001.9
Specifications
EF4-N21- - / / /
Sub−class Stitchwidth Device
Sub-class Applications Stitchtype No.of
needles No.of threads
(mm)
Needle
gauge
(mm)
Stitch width
(mm)
Max. stitch
length
Differential
ratio
22 -4
-5
-6
-7
242.2
4
5
6
7
0.9 – 3.8 0.7 – 2.0
23 -4
-5
-6
-7 Mock safety
stitch 242.2
4
5
6
7
0.9 – 3.8 0.7 – 2.0
24 -5
-6
-7 2435
6
70.9 – 3.8 0.7 – 2.0
25 -5
-6
-7 Mock safety
Stitch 2435
6
70.9 – 3.8 0.7 – 2.0
27 -5
-6
-7 Bulky knit 242.2
5
6
70.4 – 2.4 1.1 – 3.8
28 -5
-6
-7
Bulky knit
Mock safety
stitch 242.2
5
6
70.4 – 2.4 1.1 – 3.8
31 -6
-7 2436
71.2 – 5.0 0.7 – 1.4
32 -6
-7 Mock safety
stitch 2436
71.2 – 5.0 0.7 – 1.4
33 -5
-6 Ruffling 242.2
5
60.8 – 3.2 0.8 – 2.8
34
-5
-6
Ruffling
Mock safety
stitch 242.2
5
60.8 – 3.2 0.8 – 2.8
··· Light-weight materials ···Heavy-Weightmaterials
··· Medium-weight materials ··· Extra heavy-weight materials

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 7/31
2001.9
EF4-V51A- - / / /
Sub−class Stitchwidth Device
(rpm)
Max. speed
(mm)
Height of
presser foot
(mm)
Pitch of feed
dog
Type of feed dog
(standard) (DC x27) Needlesize V51A N21 Looper locus Attachment
5.5 1.6 3 - Row 11 8,000 6,700 H
5.5 1.6 3 - Row 11 7,000 6,700 H
5.5 1.6 3 - Row 11 8,000 6,700 H
5.5 1.6 3 - Row 11 7,000 6,700 H
5.5 2.5 3 - Row 14 8,000 6,500 H Angle knife
5.5 2.5 3 - Row 14 7,000 6,500 H Angle knife
6 2.5 3 - Row 18 6,500 6,000 E Angleknife
6 2.5 3 - Row 18 5,500 5,500 E Angleknife
5.5 1.6 3 - Row 11 7,500 6,500 H Ruffler
5.5 1.6 3 - Row 11 7,500 6,500 H Ruffler
Over-looper locus
S ··· Standard lift
H ··· High lift
E ··· Extra high lift

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 8/31 2001.9
Specifications
EF4-N21- - / / /
Sub−class Stitchwidth Device
Sub-class Applications Stitchtype No.of
needles No.of threads
(mm)
Needle
gauge
(mm)
Stitch width
(mm)
Max. stitch
length
Differential
ratio
37 -5
-6 Ruffling with piping 242.2
5
60.8 – 3.2 0.8 – 2.8
38 -5
-6 Ruffling with piping 242.2
5
60.8 – 3.2 0.8 – 2.8
41 -5
-6 Taping 242.2
5
60.9 – 3.8 0.7 – 2.0
42 -5
-6 Taping
Mock safety
stitch
242.2
5
60.9 – 3.8 0.7 – 2.0
45 -5
-6
-7
Taping
Bulky knit 242.2
5
6
70.4 – 2.4 1.1 – 3.8
46 -5
-6
-7
Taping
Bulky knit
Mock safety
stitch
242.2
5
6
70.4 – 2.4 1.1 – 3.8
49 -5
-6 Back-tacking 242.2
5
60.9 – 3.8 0.7 – 2.0
57 -6
-7 Bulky knit 242.5
6
70.4 – 2.4 1.1 – 3.8
58 -6 Bulky knit
Back-tack 2 4 2.5 6 0.4 – 2.4 1.1 – 3.8
··· Light-weight materials ··· Heavy-Weightmaterials
··· Medium-weight materials ··· Extra heavy-weight materials

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 9/31
2001.9
EF4-V51A- - / / /
Sub−class Stitchwidth Device
(rpm)
Max. speed
(mm)
Height of
presser foot
(mm)
Pitch of feed
dog
Type of feed dog
(standard) (DC x27) Needlesize V51A N21 Looper locus Attachment
5 1.6 3 - Row 11 7,500 6,500 H Piping ruffler
5 1.6 3 - Row 11 7,000 6,500 H Piping ruffler
5.5 1.6 3 - Row 11 8,000 6,700 H Tapeguide
5.5 1.6 3 - Row 11 7,500 6,700 H Tapeguide
5.5 1.6 3 - Row 14 8,000 6,500 H Tape guide
Angle knife
5.5 1.6 3 - Row 14 7,000 6,500 H Tape guide
Angle knife
5.5 1.6 3 - Row 11 8,000 6,700 H Back-tack
7 2.5 3 - Row 14 6,500 6,000 E Angleknife
7 2.5 3 - Row 14 6,500 6,000 E Angleknife
Over-looper locus
S ··· Standard lift
H ··· High lift
E ··· Extra high lift

EF4-N11, V41A, N21, V51A, MA4-N31, V61A 10/31 2001.9
Specifications
MA4-N31- - / / /
Sub−class Stitchwidth Device
Sub-class Applications Stitchtype No.of
needles No.of threads
(mm)
Needle
gauge
(mm)
Stitch width
(mm)
Max. stitch
length
Differential
ratio
61 -2
-3
-4
-5
252
2
3
4
5
0.9 – 3.8 0.7 – 2.0
62 -2
-3
-4
-5
242
2
3
4
5
0.9 – 3.8 0.7 – 2.0
63 -3
-4
-5
-6
-7
253
3
4
5
6
7
0.9 – 3.8 0.7 – 2.0
64 -3
-4
-5
-6
-7
243
3
4
5
6
7
0.9 – 3.8 0.7 – 2.0
65 -4
-5
-6
-7
255
4
5
6
7
0.9 – 3.8 0.7 – 2.0
66 -4
-5
-6
-7
245
4
5
6
7
0.9 – 3.8 0.7 – 2.0
67 -4
-5 Ruffling 2524
50.8 – 3.2 0.8 – 2.8
68 -4
-5 Ruffling 2424
50.8 – 3.2 0.8 – 2.8
69 -4
-5 Ruffling 2534 50.8 – 3.2 0.8 – 2.8
70 -4
-5 Ruffling 2434
50.8 – 3.2 0.8 – 2.8
71 -5
-6 Ruffling 2555
60.8 – 3.2 0.8 – 2.8
72 -5
-6 Ruffling 2455
60.8 – 3.2 0.8 – 2.8
··· Light-weight materials ··· Heavy-Weightmaterials
··· Medium-weight materials ··· Extra heavy-weight materials