Ultra High Speed Overedge
and Safety Stitch Machine
Instruction Manual
and Parts List
® Singer is a registered trademark of The Singer Company Limited or its affiliated companies.
© 2010 Copyright The Singer Company Limited
321D
131M-04
131M-04 / KS
132M-015
134M-04
241M-24
241M-24 / KS
244M-24
251M-35
251M-35 / KH
251M-55
251M-55 / KH
251M-56
251H-56 / KH
321K
131M-04
131M-04 / KS
132M-015
134M-04
241M-24
241M-24 / KS
244M-24
251M-35
251M-35 / KH
251M-55
251M-55 / KH
251M-56
251H-56 / KH
Contents
1snoitcurtsnI ytefaS1
1.1 1snoitcurtsnI ytefaStnatropmI
1.2 For S 2noitarepO efa
3noitacfiicepS enihcaM dna noitpircseD tcudorP2
2.1 3noitpircseD tcudorP
2.2 4noitacfiicepS enihcaM
2.3 5snoitacfiicepS tleB-V dna yelluP rotoM ,rotoM
3 Mounting and Adjustment Instructions
4 Maintenance
5 Troubleshooting
6
3.1 6margaiD tuO-tuC elbaT
3.2 7noitallatsnI enihcaM
3.3 9eganiarD liO dna noitacirbuL
3.4 01riovreseR ot liO nociliS lliF
3.5 01)tnemecalpeR ro( tnemhcattA eldeeN
3.6 11efinK rewoL dna reppU gnicalpeR
3.7 21gnidaerhT enihcaM
3.8 31tnemtsujdA noisneT daerhT
3.9 41erusserp toof resserP
3.10 41etaR deeF laitnereffiD eht gnitsujdA
3.11 Stitch Length Adjustment
3.12 Parts Relation and Timing
15
16
17
4.1 71gninaelC daeH enihcaM
4.2 71gninaelC retliF dna egnahC liO
4.3 71noitcepsnI ytefaS
18
Contents
6 Parts list 21
6.1 Machine Bed Frame Components 22
6.2 Machine Cover Components (1) 24
6.3 Machine Cover Components (2) 26
6.4 Crank Shaft Drive Components 28
6.5 Thread Tension Components 30
6.6 Thread Guide and Thread Take-up Components (1) 32
6.7 Thread Guide and Thread Take-up Components (2) 34
6.8 Thread Guide and Thread Take-up Components (3) 36
6.9 Needle Bar Components (1) 38
6.10 Needle Bar Components (2) 40
6.11 Needle Plate and Needle Guard Components 42
6.12 Upper Looper Components 44
6.13 Lower Looper Components 46
6.14 Chain Stitch Looper Components (1) 48
6.15 Chain Stitch Looper Components (2) 50
6.16 Differencial Feed Components 52
6.17 Feed Dog Components 54
6.18 Knife Drive Components 56
6.19 Presser Foot Components 58
6.20 Lubrication Components (1) 60
6.21 Lubrication Components (2) 62
6.22 Silicon Oil Reservoir Components 64
6.23 Exclusive Parts List for 321K series 66
6.24 Thread Stand Components 68
6.25 Accessories 70
6.26 Machine Support Plate For Semi-Submerged Components 72
6.27 Specific Parts for 321D-251 Hand 321K-251H 73
6.28 Optional Parts 74
6.29 Back Latch Components 76
6.30 Vacuum Suction & AFL Device (Option parts) 78
6.31 ChainCutter DeviceComponents 80
7 Gauge Parts List
81
1
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Safety Instructions
1.1
Important Safety
Instructions
Important
• Before running the machine, make
sure all relevant safety specifica-
tions are adequate to specifica-
tions and technical standards in
your country.
• The machine should not be run
without its safety devices.
• The machine should only be oper-
ated by properly trained personnel.
• For your safety, goggles must be
used while running the machine.
• Turn off or unplug the machine
when the following situations arise:
• Passing the thread by the nee-
dle or replacing the bobbin or
looper.
• Replacing the needle, presser
foot, throat plate, feed dog and
sliding plate.
• When the machine is in mainte-
nance.
• When the operator is not run-
ning the machine.
• In case of lubricant oil contact
with the eyes or skin, washed the
surface with plenty of icy water
with a generous amount of cold
water. In case of ingestion, seek
medical help immediately.
• Repair, fitting or maintenance
should only be performed by
properly trained personnel.
• Maintenance and repair on elec-
tric equipment should only be
made by qualified personnel. If
any electric device is damaged,
the machine should be immedi-
ately stopped.
• Before starting the machine in full
running, a test must be conducted
to assure that machine and opera-
tor are able to perform the task.
• The machine should not be placed
next to a sound source as an ultra-
sonic welding machine and other
equipment.
• The machine should only be run
with the proper electric cable and
connectors, and also the adequate
grounding.
• The machine should only be used
to sew materials as indicated in
its instructions manual, and indi-
cations of use should be followed.
Singer will not be held responsible
for any damage caused by unau-
thorized changes in the product.
When using the
machine, basic safety
procedures must
be followed. Read
with attention all
instructions before
using the machine.
When using it,
understand that
all basic safety
instructions are
not limited to the
following items.
Read all instructions,
take care of this
manual, and use it
as reference when
necessary.
• To avoid the risk of electric shock,
do not open the motor wiring box
and do not touch the components
assembled inside the wiring box.
• To avoid injuries do not run the
machine without the belt cover or
in case any other safety device is
removed.
• To avoid possible injuries keep fin-
gers,
head and clothes far from
wheel, belt and motor when the ma-
chine is running. Nothing should be
placed near those parts.
• To avoid injuries never put your
fingers next to the rotating hook
and the thread take-up lever cover
when the machine is running.
• To avoid possible injuries be care-
ful when putting down or lifting
the machine head.
• To avoid accident in case of a sud-
den start of the machine always
turn it off when laying it down, or
remove the belt cover and the belt.
• If you machine is equipped with
a servomotor, it does not make
noises while being driven.To avoid
a possible accident caused by an
unexpected start, be sure the ma-
chine is turned off.
• To avoid electrical shock, do not
run the machine without proper
grounding.
• To minimize the risk of accidents
or damage in electric components
caused by electric discharge turn
the machine off before unplug-
ging it.
• Clean the machine periodically.
1.2
For Safe
Operation
2
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Ultra high speed overedge and safety stitch machines
Product Description
and Machine Specification
2.1
Product
Description
3
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
2.2
Machine
Specification
Table 1 – Machine Specification
4
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Needle Gauge Overedge Bight Stitch Length Presser Foot Lift Singer Speed
[mm] [mm] [mm] [mm] Needle Cat [spm]
321D-131M-04 4 6120-06 75/11 8500 Three-thread overlock machine
321D-131M-04 / KS 4 6120-06 75/11 8500
Three-thread overlock machine with vertical chain
cutter and AFL device
321D-132M-015 1.5 6120-06 65/9 8500
Three-thread handkerchief edging (rolled hem)
overlock machine
321D-134M-04 4 6120-06 75/11 7500
Three-thread back latch overlock machine
321D-241M-24 4 6120-06 75/11 7500 Four-thread overlock machine
321D-241M-24 / KS 4 6120-06 75/11 7500
Four-thread overlock machine with vertical chain
cutter and AFL device
321D-244M-24 4 6120-06 75/11 7500
Four-thread back latch overlock machine
321D-251M-35 5 6120-06 90/14 7500
Five-thread overlock machine
321D-251M-35 / KH 5 6120-06 90/14 7500
Five-thread overlock machine with vertical chain
cutter and AFL device
321D-251M-55 5 6120-06 90/14 7500 Five-thread overlock machine
321D-251M-55 / KH 5 6120-06 90/14 7500
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
321D-251H-56 6 6120-06 130/21 6500 Five-thread heavy duty overlock machine
321D-251H-56 / KH 6 6120-06 130/21 6500
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
321K-131M-04 4 6120-06 75/11 8500 Three-thread overlock machine
321K-131M-04 / KS 4 6120-06 75/11 8500
Three-thread overlock machine with vertical chain
cutter and AFL device
321K-132M-015 1.5 6120-06 65/9 8500
Three-thread handkerchief edging (rolled hem)
overlock machine
321K-134M-04 4 6120-06 75/11 7500 Three-thread back latch overlock machine
321K-241M-24 4 6120-06 75/11 7500 Four-thread overlock machine
321K-241M-24 / KS 4 6120-06 75/11 7500
Four-thread overlock machine with vertical chain
cutter and AFL device
321K-244M-24 4 6120-06 75/11 7500 Four-thread back latch overlock machine
321K-251M-35 5 6120-06 90/14 7500 Five-thread overlock machine
321K-251M-35 / KH 5 6120-06 90/14 7500
Five-thread overlock machine with vertical chain
cutter and AFL device
321K-251M-55 5 6120-06 90/14 7500 Five-thread overlock machine
321K-251M-55 / KH 5 6120-06 90/14 7500
Five-thread overlock machine with horizontal chain
cutter and AFL device
321K-251H-56 6 6120-06 130/21 6500 Five-thread heavy duty overlock machine
321K-251H-56 / KH 6 6120-06 130/21 6500
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
0.7 ~ 2.0
0.8~1.5 7
5
0.7 ~ 2.0
5
0.8~1.5 7
3.8
24 2
25
3
5
With Direct Drive Servo Motor
13 -
2
25
3
5
Application
With Clutch Motor
13
-
3.8
24
Singer Model
Needles
Threads
Differential Rate
2.3
Motor,
Motor Pulley
and V-Belt
Specifications
½ HP 2-pole clutch motor
Motor pulley diameter
M type v-belt
Direct drive servo motor and control system.
2.3.1 For 321D series
2.3.2 For 321K series
Machine Speed
[spm] 50Hz 60Hz
5,500 110 90
6,000 115 95
6,500 130 105
7,000 140 115
7,500 150 125
Motor Pulley Diameter [mm]
Table 2
5
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
RR2255
RR2255
1133
65
65
11006655
662255
447755
331100
229955
115555
3322
4400
RR2244
4488
225500
111177..99559977..3311
4400
5555
4477
9988
111100
224400
334455
335588
4455
118855
221100
222255
5500
9955
111155
114411
RR2244
111188..55
113388119900
555500
20
RR1166
4400
BBBB
CCCC
AAAA
CC--CC
2255
2255
11..55
99
BB--BB
2255
1133
33
AA--AA
3
3.1
6600
Table Cut-Out
Diagram
Setup and Adjustment Instructions
6
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Figure 1
Machine
Installation
3.2
Figure 2
Install the machine support compo-
nents and the cloth waste chute as
indicated in Figure 2. In case of
semi-submerged assembly, the
distance between the needle plate
top surface and the table top is
around 100 mm. For fully-
submerged assembly, the distance
is around 5.0 mm.
7
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
1
2
3
4
7
8
5
6
9
11
12
10
Machine
Installation
Figure 4
Figure 3
Mount the machine head over the
machine support plate.
Connect the machine handwheel to
the clutch motor with the v-belt (for
321D only)
Install the belt cover according to Figure 4.(for 321D only)
Adjust the tension of the v-belt so
that it can be about 20 mm bent
inward when you press the middle
of it and make sure the motor turn-
ing direction is clockwise, referred
to the Figure 3.(for 321D only)
Set the pedal of the clutch motor to
the left side and the pedal of the
presser foot lift at right side.
Install the thread stand referred to
the parts list.
8
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
2cm
3.2
Lubrication
and Oil
Drainage
3.3
Figure 5a Figure 5b
Figure 6 Figure 7
9
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Important
As this is a ultra
high speed
machine, DO NOT
run the machine
before oiling and
assuming the
direction of the
motor rotation.
Remove the rubber plug and fill the
lubricant oil (Singer Oil) until the
indicator of the oil level between 'L'
and 'H' lines of the oil level sight
window. After that put back the
rubber plug.
When using the machine for the
first time, or a machine that has not
been used for some time, oil the
needle bar top, the guides and
looper before running it.
To preserve the machine, change
the oil after the four weeks of use.
After that, the oil must be changed
every six months. To change the oil,
simply remove screw indicated on
Figure 6. After draining the oil,
replace the screw and fill the
machine with new oil.
This machine has an oil filter that
must be cleaned every month or
changed as needed. To replace the
oil filter, simply remove four screws
and remove the top cover indicate
on Figure 7. Then remove three
screws and remove oil filter cap.
L
H
Fill Silicon
Oil to
Reservoir
Figure 8
Figure 9 (b)
Figure 9 (a)
For 1 needle
1
For 2 needle
Figure 10
10
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Needle
Attachment
(or Replacement)
3.5
3.4
When sewing in ultra high speed,
fill the device with silicon oil in
order to prevent needle thread
Use only Singer’s Cat. 6120 needles
Loosen screw ‘1’ as indicated on
Figure 9 & 10 with the Allen key
wrench in the accessory box and
insert the needle (or remove the old
needle).
Insert the needle with its long
groove facing towards you and
push it up until the bar end..
Tighten screw ‘1’.
breakage and fabric damage. As
show on Figure 8.
OK!
Insert the needle to
the proper depth.
1
Replacing
Upper and
Lower Knife
Figure 11
Figure 12 (a)
11
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.6
0.5~1.0mm
Top surface
of the needle
plate
4
6
6
4
3
8
7
1
4
5
2
Replacing the upper knife
1. Loosen screw ‘1’. Move lower
knife holder ‘2’ to the extreme left
position. Tighten screw ‘1’ temporar-
ily.
2. Remove screw ‘3’ and then upper
knife ‘4’.
To install a new upper knife, turn
the handwheel until the upper knife
holder reaches the lowest position of
its stroke. Overlap the cutting edges
of the upper anb lower knives by
0.5~1.0 mm according to the over-
edge width (Figure 11).
3. Overlap the cutting edges of the
upper and lower knives so that mid-
point ‘A’ on upper knife ‘4’ and the
midpoint of lower knife ‘6’ are
crossed (Figure 12). Loosen screw
Figure 12 (b)
Top surface
of the needle
plate
4
A
6
Adjusting overedge width
I. Loosen screw ‘1’ˈmove lower knife
holder ‘2’ all the way to the left and then
tighten the screw ‘1’ temporarily.
2. Loosen screw ‘7’ˈmove upper knife
clamp ‘8’ left or right as required. Install
upper and lower knives by referring to
"Replacing the upper knife" procedures 3
and 4.
‘1’. Make sure the upper and lower
knives mate positively. Then tighten
screw ‘1’.
4. Place a thread between the upper
and lower knives. Check the cutting by
turning the handwheel.
Replacing the lower knife
1. Loosen screw ‘1’. Move lower knife
holder ‘2’ to the extreme left position.
Tighten screw ‘1’ temporarily.
2. Loosen screw ‘5’ and remove lower
knife ‘6’. Install a new knife by referring
to "Replacing the upper knife” proce-
dures 3 and 4.
To install a new lower knife, the
cutting edge of the lower knife should
be flush with the top surface of the
needle plate.
Machine
Threading
Figure 13
Figure 14 Figure 15
12
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.7
Easy
Threading
Method
3.7.1
Threading
Diagram
3.7.2
Important
Refer to the sewing type you need for correct threading.
Any incorrect threading may cause thread brake, uneven
stitches or skip stitches.
1
Open three covers.
Move the presser foot aside.
Knot the preset thread and the
thread being used together to
thread the machine.
2
Needle thread
Trim the knots off neatly
before passing through
the eye of the needle to
rethread.
3
4
For five thread machine
For three / four thread machine
Looper thread
Trim the knots off neatly
after passing through the
yey of the looper.
Make sure the machine is
threaded correctly by
referring to the threading
diagram.
Thread Tension
Adjustment
Figure 16
Figure 17
13
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.8
Important
The thread tension
should be adjusted
according to the
type and thickness
of the cloth,
sewing thread,
sewing width,
stitch length and
others. Therefore
the pressure of the
tension nuts or
thread guides
should be individu-
ally adjusted for
each case.
The following adjustments are related to Figure 16 &17.
Tension Nut 1: controls the needle thread or the left thread in
case of two needles.
Tension Nut 2: controls the thread in the right needle.
Tension Nut 3: controls the thread in the lower looper.
Tension Nut 4: controls the thread in the lower looper.
Tension Nut 5: controls the thread of the safety stitch.
To loosen
1
2
3
To tighten
3
3
4
4
4
4
5
2
2 1
3
3
2
1
2
1
Presser foot
pressure
Figure 18
Figure 19
14
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.9
Loosen adjusting nut ‘1’ of Figure
18 and turn adjusting bar ‘2’ to
adjust the presser foot pressure.It
The differential feed ratio is the
ratio of movements between the
main feed dog and differential feed
dog. When the movement of main
feed dog is bigger than the differen-
tial feed dog, the fabric is stretched
Adjusting the
Differential
Feed Rate
3.10
at sewing. Otherwise the fabric will
be shrunk.
Loosen the adjusting nut 1 and turn
the adjusting nut 2 to adjust the
differential feed ratio. As shown on
Figure 19.
To stretch
To shrink
2
1
1
2
Heavy
Light
should be as light as possible to be
sufficient to obtain the proper stitch
formation.
Stitch Length
Adjustment
Figure 20
15
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.11
Press button to the end and keep it
pressed as shown on Figure 20.
Turn the handwheel until we have
the desired stitch length. It is shown
on the handwheel scale.
Handwheel
Important
The stitch length
adjustment is
made according
to the sewing
fabric, differential
feed ration and
other factors.
Push Button
Fine
Coarse
Aligning Mark
Parts Relation
and Timing
Figure 21
Figure 24
Figure 25
Figure 26
Figure 27
Figure 22 Figure 23
16
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3.12
(a)
(f)
(g)
(h)
(a)
(b)
(e)
(c)
(d)
3,4 Thread
Top surface of the
needle plate
Top surface of the
needle plate
Top surface of the
needle plate
5 Thread
Upper looper
left limit
position ( c )
(Figure 23)
Height of
upper looper
( c )
(Figure 23)
Upper looper
holder left
limit position
(e)
(Figure 23)
Upper looper
holder install
direction
Height of feed
dog (g)
(Figure 25)
Height of
auxiliary feed
dog (h)
(Figure 27)
Feed
eccentric
-131M-04 10.5 3.8 4.4~4.7 10.8 14.5 Left - 0.8 0.5 0.35~2.0
-131M-04 / KS 10.5 3.8 4.4~4.7 10.8 14.5 Left - 0.8 0.5 0.35~2.0
-132M-015 10.5 3.8 4.4~4.7 10.8 14.5 Left 0.6~0.7 0.3 0.35~1.7
-134M-04 10.5 3.8 5.4~5.7 10.5 13.5 Right - 0.8 0.5 0.35~1.7
-241M-24 10.5 3.8 5.4~5.7 10.5 13.5 Right - 0.8 0.5 0.35~2.0
-241M-24 / KS 10.5 3.8 5.4~5.7 10.5 13.5 Right - 0.8 0.5 0.35~2.0
-244M-24 10.5 3.8 5.4~5.7 10.5 13.5 Right - 0.8 0.5 0.35~2.0
-251M-35 10.5 3.8 4.4~4.7 10.8 14.5 Left 1.5 0.8 0.5 0.35~2.0
-251M-35 / KH 10.5 3.8 4.4~4.7 10.8 14.5 Left 1.5 0.8 0.5 0.35~2.0
-251M-55 10.5 3.8 4.4~4.7 10.8 14.5 Left 1.5 0.8 0.5 0.35~2.0
-251H-56 11.9 4.2 5.0~5.3 12 14.5 Left 1.7 0.8 0.5 0.35~2.0
-251H-55 / KH 10.5 3.8 4.4~4.7 10.8 14.5 Left 1.5 0.8 0.5 0.35~2.0
-251H-56 / KH 11.9 4.2 5.0~5.3 12 14.5 Left 1.7 0.8 0.5 0.35~2.0
Model
321D & 321K
Height of
needle
(Figure 21)
Lower looper
left limit
position
(Figure 22)
Chain looper
left limit
position (f)
(Figure 24)
Upper looper
Feed dog
Maintenance
4
4.1
4.2
4.3
Machine Head
Cleaning
Oil Change
and Filter
Cleaning
Safety
Inspection
17
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Clean the machine periodically
with a soft and dry cloth to remove
the excess of dust on the machine
head. Do not use any kind of
lacquer thinner to wipe the surface.
When Machine is running, oil will
be sprayed into the oil window. If
no oil sprayed, please check oil
level (see topic 3.3)
If the machine was idle for a long
time, oil the top of the needle
holder, guides and looper guides
before resuming the operation.
The oil should be changed every
four months. To replace the oil,
follow the instructions of topic 3.3.
The oil filter should be cleaned
every month or replaced by a new
one as necessary. To clean or
replace the oil filter, follow the
instructions of topic 3.3.
Frequently check if all safety
devices are properly installed and
adjusted.
Check all screws that fix and hold
the machine head that should be
properly tight.
Check and be sure the V-belt is not
excessively worn out and see that
it has the proper tension (Except
321K)
Check and be sure there is no
motor overheating and be sure that
the cable and electric connector are
not damaged.
(Operating)
OK!
Figure 28
Figure 29
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
/
