Singer 321C 133M-04 / TF User manual
High Speed
Overlock Machine
131M-04
132M-015
133M-04 / TF
134M-04
241M-24 / 25
243M-24 / TF
244M-24
251M-35
251M-55
251H-56
321C
Instruction Manual
and Parts List
® Singer is a registered trademark of The Singer Company Limited or its affiliated companies.
© 2009 Copyright The Singer Company Limited
From the library of: Superior Sewing Machine & Supply LLC
Contents
1Safety Instructions 1
1.1 Important Safety Instructions 1
1.2 Safe Operation 2
2Product Description and Machine Specification 3
2.1 Product Description 3
2.2 Machine Specification 4
2.3 Motor, Motor Pulley and Belt 4
3Mounting and Adjustment Instructions 5
3.1 Table Cut-Out Diagram 5
3.2 Machine Installation 6
3.3 Lubrification and Oil Drainage 8
3.4 Needle Attachment (or Replacement) 9
3.5 MachineThreading 9
3.6 ThreadTension Adjustment 10
3.6.1 Tension Nut Adjustment 10
3.6.2 NeedleThread Control 10
3.6.3 LooperThread Control 11
3.6.4 Chain LooperThread Cam Control 11
3.7 Adjusting the Differential Feed Rate 12
3.8 Stitch Length Adjustment 12
3.9 Parts Relation andTiming 13
3.9.1 Needle and Needle Plate 13
3.9.2 Upper Looper (Spreader) and Needle 14
3.9.3 Lower Looper and Needle 14
3.9.4 Upper and Lower Loopers 15
3.9.5 Needle and Needle Guard 15
3.9.6 Chain Looper and Needle 15
4Maintenance 16
4.1 Machine Head Cleaning 16
4.2 Oil Change and Filter Cleaning 16
4.3 Safety Inspection 16
5Troubleshooting 17
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6Parts List 19
6.1 Frame Components 20
6.2 Cloth Plate Components 22
6.3 Cover Components 24
6.4 Main Shaft Components 26
6.5 Needle Bar Components 28
6.6 Thread Guide Components 30
6.7 Upper Looper Components 32
6.8 Lower Looper Components 34
6.9 Front Looper Components 35
6.10 Cam Components 36
6.11 Differential Feed Components 38
6.12 Feed Dog Components 40
6.13 Trimming Components 42
6.14 Presser Foot Components 44
6.15 Lubrication Components 46
6.16 Feed Snap Components 48
6.17 Thread Spool Components 50
6.18 Plate Row Material Components 52
6.19 Accessories 53
7Gauge Parts List 54
Contents
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1
High Speed Overlock Machine |Instructions Manual and Parts List
Safety Instructions
1.1
Important Safety
Instructions
Important
•Beforerunningthemachine,make
sure all relevant safety specifica-
tions are adequate to specifica-
tions and technical standards in
yourcountry.
•The machine should not be run
withoutitssafetydevices.
•The machine should only be oper-
atedbyproperlytrainedpersonnel.
•Foryoursafety,gogglesmustbe
usedwhilerunningthemachine.
•Turnofforunplugthemachinein
thefollowingsituations:
•Passing the thread by the nee-
dle or replacing the bobbin or
looper.
•Replacing the needle, presser
foot,throatplate,feeddogand
slidingplate.
•Whenthemachineisinmain-
tenance.
•When the operator is not run-
ningthemachine.
•In case of lubricant oil contact
with the eyes or skin, wash the
surface with plenty of icy water.
Incaseofingestion,seekmedical
helpimmediately.
•Repair, fitting or maintenance
should only be performed by
properlytrainedpersonnel.
•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-
atelystopped.
•Beforestartingthemachineinfull
running,atestmustbeconducted
toassurethatmachineandopera-
torareabletoperformthetask.
•Themachineshouldnotbeplaced
nexttoasoundsourceasanultra-
sonicweldingmachineandother
equipment.
•The machine should only be run
with the proper electric cable
andconnectors,andalsothead-
equategrounding.
•Themachineshouldonlybeused
to sew materials as indicated in
itsinstructionsmanual,andindi-
cationsofuseshouldbefollowed.
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.
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High Speed Overlock Machine |Instructions Manual and Parts List
•Toavoidtheriskofelectricshock,
donotopenthemotorwiringbox
anddonottouchthecomponents
assembledinsidethewiringbox.
•To avoid injuries do not run the
machinewithoutthebeltcoveror
incaseanyothersafetydeviceis
removed.
•To avoid possible injuries keep
fingers, head, and clothes far
fromwheel,beltandmotorwhen
the machine is running. Nothing
shouldbeplacednearthoseparts.
•To avoid injuries never put your
fingers next to the loopers when
themachineisrunning.
•The shuttle whirls at high speed
while the machine is running.To
avoid hand injuries, keep them
away from the shuttle while the
machine is running.Turn off the
machinetoreplacethebobbin.
•Toavoidpossibleinjuriesbecare-
ful when putting down or lifting
themachinehead.
•To avoid accidents in case of a
sudden start of the machine al-
ways turn it off when laying it
down, or remove the belt cover
andthebelt.
•If your machine is equipped with
a servomotor, it does not make
noiseswhilebeingdriven.Toavoid
a possible accident caused by an
unexpectedstart,bevsurethema-
chineisturnedoff.
•To avoid electric, do not run the
machinewithoutproperground-
ing.
•To minimize the risk of accidents
or damages in electric compo-
nentscausedbyelectricdischarge
turn the machine off before un-
pluggingit.
•Cleanthemachineperiodically.
1.2
Safe Operation
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High Speed Overlock Machine |Instructions Manual and Parts List
High Speed Overlock Machine
Product Description
and Machine Specification
2.1
Product
Description
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High Speed Overlock Machine |Instructions Manual and Parts List
2.2
2.3
Machine
Specification
Motor, Motor
Pulley and Belt
• Clutch motor 1/2 HP (400W) high
speed (2 poles)
• Belt type M
Model
321C
Needle Thread Gauge
[mm]
Stitch
width
[mm]
Stitch
Length
[mm]
Differential Presser
Height
[mm]
Needle
Singer Type
Speed
[spm]
Usage
131M-04
1 3 -
4.0
3.6 0.7~2.0 5.5
6120-06 75/11 6,000 Three-thread overlock machine
132M-015 1.5 6120-06 65/9 6,000 Three-thread handkerchief edging
(rolled hem) overlock machine
133M-04 / TF 4.0 6120-06 75/11 5,500 Three-thread elastic attaching
overlock machine
134M-04 4.0 6120-06 75/11 6,000 Three-thread back latch overlock
machine
241M-24
242
4.0
3.6 0.7~2.0 6.0
6120-06 75/11 6,000 Four-thread overlock machine
241M-25 5.0 6120-06 75/11 6,000 Four-thread overlock machine
243M-24 / TF 4.0 6120-06 75/11 5,500 Four-thread elastic attaching
overlock machine
244M-24 4.0 6120-06 75/11 6,000 Four-thread back latch overlock
machine
251M-35
35
3.0 5.0 3.6
0.7~2.0 6.0
6120-06 90/14 5,500 Five-thread overlock machine
251M-55 5.0 5.0 3.6 6120-06 90/14 5,500 Five-thread overlock machine
251H-56 5.0 6.0 5.0 6120-06 130/21 5,500 Five-thread heavy duty
overlock machine
Maximum Machine
Speed [spm]
Motor Pulley Diameter [mm]
60 Hz 50 Hz
4,500 70 90
4,750 75 95
5,000 80 100
5,250 85 105
5,500 90 110
6,000 95 115
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5
High Speed Overlock Machine |Instructions Manual and Parts List
Mounting and Adjustment Instructions
3.1
Table Cut-Out
Diagram
Figure 1
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6
High Speed Overlock Machine |Instructions Manual and Parts List
Machine
Installation
3.2 Installthemachinesupportcompo-
nentsandtheresiduescamasindi-
catedongure2.Incaseofsemi-in-
sertedassemblythedistancefrom
theneedlebedsurfacetothetable
topis100mm.Forinsertedassem-
blythedistanceisabout5.0mm.
Figure 2
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High Speed Overlock Machine |Instructions Manual and Parts List
Machine
Installation
Set the machine head on the sup-
portbase.
Connectthemachinewheeltothe
motorwiththebelt.
Adjustthebelttensionsothatthere
isagapofabout20mmwhenthe
centerofbeltispressured.
Setthebeltcoveraccordingtog-
ure4.
Figure 3
Figure 4
Install the friction motor pedal at
therightsideandthepedalofthe
presserlifterattheleftside.
Besure themotor isclockwise di-
rected,referredtogure3.
3.2
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High Speed Overlock Machine |Instructions Manual and Parts List
3.3
Lubrication
and Oil
Drainage
As this is a high
speed machine,
DO NOT run the
machine before
oiling and assuring
the direction of
motor rotation.
Important
Remove the oil ow sight win-
dow ‘A’ and ll with the lubricant
oil (Singer Oil), until the indicator
oftheoillevelisbetweenthetwo
linesoftheoillevel sightwindow
‘B’.Afterthat,putbacktheoilow
window‘A’andsqueezeit.
When using the machine for the
rst time, or a machine that has
not been used for some time, oil
theneedlebartop,theguidesand
loopersbeforerunningit.
A new machine should be run at
80% maximum speed on the rst
four weeks.After this initial cycle,
Figure 5
Figure 6
C
B
replace the oil and from then on
themachine canbe usedat maxi-
mumspeed.
To preserve the machine, change
theoilafterfourweeksofuse.After
thattheoilmustbechangedevery
fourmonths.Tochangetheoilsim-
plyremovethescrew‘C’indicated
on gure 6. After draining the oil,
replacethescrewandcompletethe
machinewithnewoil.
This machine has an oil lter (g-
ure 6) that must be cleaned every
monthorchangedasneeded.
Oil
Oil
A
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High Speed Overlock Machine |Instructions Manual and Parts List
3.5
Machine
Threading
Refer to the sewing
type you need for
correct threading. Any
incorrect threading
may cause thread
brake, uneven
stitches or skip
stitches.
Important
For five thread machine For three / four thread machine
3.4
Needle
Attachment
(or Replacement)
UseneedleSinger6120-06.
Release screw ‘1’ as indicated on
gure 7 and put (or withdraw the
oldneedle).
Inserttheneedlewiththeslotturned
tothebacksideandpushitupuntil
thebarend.Tightenscrew‘1’.
Figure 7
Figure 8 Figure 9
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High Speed Overlock Machine |Instructions Manual and Parts List
3.6
Thread Tension
Adjustment
The thread tension should be adjusted according to the type and thickness of
cloth, thread, sewing width, stitch length and others. Therefore, the pressure on
theTension Buttons orThread Guides should be individually adjusted for each case.
Important
3.6.1
Tension Nut
Adjustment
The following adjustments are re-
latedtogure10.
Tension Nut 1: controlsthe needle
threadortheleftthreadincaseof
twoneedles.
Tension Nut 2: controls the thread
intherightneedle.
Tension Nut 3: controls the thread
intherightlooper
Tension Nut 4: controls the thread
intheleftlooper
Tension Nut 5: controls the thread
ofthesafetystitch.
Figure 10
3.6.2
Needle
Thread Control
Foralltypesofstitch504,512or514,
movedowntheguides‘1’ and‘2’.
Forthetypesofstitch503and505,
movethe guides‘1’ and ‘2’ tothe
highestpoint.
Figure 11
The signal (+)
increases the tension
in the thread. The
signal (-) reduces the
tension of the thread.
Note
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High Speed Overlock Machine |Instructions Manual and Parts List
3.6.3
Looper
Thread Control
Forthetypeofstitch512,whenAd-
justguide ‘1’ and ‘2’ asfollowsthe
looperontherightisattheleftfar
end,adjust‘1’ and ‘2’inlevelwith
thedottedmark,asongure12.
Forthetypeofstitch503and505,
move the guides to the lowest
pointandadjust ‘1’ and ‘2’ inlevel
withthecontinuousline.
Adjust guide ‘3’ as follows:
•Position‘A’:forstretchythread
•Position‘B’:forseamingandblind
stitchhemming
•Position‘C’:stitchtype512
Adjust guide ‘4’ as follows:
•Position‘D’:forstretchythread
•Position‘E’:forseamingandblind
stitchhemming.
Figure 12
3.6.4
Chain Looper
Thread Cam
Control
When the needle is on high posi-
tion,mark ‘A’ mustbealignedwith
the thread guide bracket ‘1’, as
shownongure13.
Release screw ‘2’ and the thread
cam‘3’. Turnitclockwiseforquick
releaseofthreadthroughthecam.
Figure 13
The signal (+) means
more thread and (-)
means less thread.
Note
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High Speed Overlock Machine |Instructions Manual and Parts List
3.7
Adjusting the
Differential
Feed Rate
Adjustmentofthedifferentialisthe
dragging proportion between the
mainfeeddoganddifferencialfeed
dog.Whenthemovementofmain
feed dog is less than that of the
differencialfeeddog,theclothwill
befrilledduringsewing.Otherwise,
theclothwillbestretched.
3.8
Stitch Length
Adjustment
The stitch length
adjustment is
made according to
the sewing fabric,
differential feed ratio
and other factors.
Important
Pressbuttontotheendandkeepit
pressedasshownongure15.
Turn the wheel until we have the
desiredstitchlength.Itisshownon
thewheelscale.
Figure 15
Figure 14
Releasenut‘1’ ongure14,andturn
screw‘2’ clockwisetostrechingthe
clothorcounterclockwisetoshrink
it.Retightendthenut‘1’.
Adjust
Differential
Scala
12345
1 : 3 - 1 : 0.7 1 : 0.9 1 : 1.1 1 : 1.3
1 : 2 1 : 0.7 1 : 1.0 1 : 1.4 1 : 1.7 1 : 2.0
1 : 3 1 : 1.0 1 : 1.5 1 : 2.0 1 : 2.5 1 : 3.0
1 : 4 1 : 1.1 1 : 1.6 1 : 2.3 1 : 2.8 1 : 3.3
When the surface of
level ‘3’ adjustment
is on scale 2, the
differential adjustment
is 1 : 1, and if it is
on the scale, its
proportion may be
adjusted up to 1 : 0.7.
Note
Dragging
Proportion
Type of
Machine
Wheel Scale
1234567
1 : 2.0 Seaming 1.0 1.5 2.0 2.5 3.0 3.5 3.8
1 : 3.0 Shirring 0.7 1.0 1.4 1.7 2.0 2.3 2.5
1 : 1.3 Serging 1.6 2.3 3.1 3.9 4.7 5.4 5.9
1 : 4.0 Special 0.6 0.9 1.2 1.5 1.8 2.1 1.0
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High Speed Overlock Machine |Instructions Manual and Parts List
3.9
Parts Relation
and Timing
3.9.1
Needle and
Needle Plate
When needle at the highest posi-
tion, distance
‘A’
between needle
point (the left needle if there are
two needles) and needle plate is
9.5to9.7mmforstandardadjust-
ment, or 10.8 to 11.0 mm for spe-
ciccases. Each needleshouldbe
centralized over each hole in the
needleplate.Therightneedlemust
beabout0.2to0.3mmaheadthe
leftneedle.
Distancebetweenneedlepoint(the
right needle if there are two nee-
dles)andthefrontpartofthehole
intheneedleplateorpresserfoot
is1.2mm.
Releasescrew‘1’,asshownong-
ure16.
Turn the wheel to see if needle is
centralized at every hole of the
needle plate. Release screw ‘2’ to
adjustneedleholder.
Turn the wheel to moveneedle to
thehighestpositionandmovenee-
dlebaruntiltheheightiscorrectly
adjusted.
Tightenscrews‘1’ and‘2’.
Figure 16
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High Speed Overlock Machine |Instructions Manual and Parts List
Figure 18
Figure 19
3.9.2
Upper Looper
(Spreader)
and Needle
Whentherightloopermovestothe
farleftend,distance‘A’ betweenthe
looper point and the center line of
theneedleis4.5to5.0mmforone
needle. For two needles, the dis-
tance‘B’ is5.5to6.0mmfromthe
leftneedle,asshownongure17.
3.9.3
Lower Looper
and Needle
When the lower looper moves to
the extremly left, the distance ‘A’
between looper point and center
line of the needle (left needle, if
twoneedles)isfrom3.4to3.6mm,
forhighliftmachines,asshownon
gure18.
When the lower looper moves to
the center line of needle (left nee-
dle, if two needles), the gap be-
tweenneedleandlooperisfrom0
to0.05mm,asshownongure19.
Figure 17
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High Speed Overlock Machine |Instructions Manual and Parts List
3.9.4
Upper and
Lower Loopers
Whentheupperandlowerloopers
arecrossed,thedistanceis0.2mm
for‘A’ and0.5mmfor‘B’, accord-
inggure20.
Figure 20
3.9.5
Needle and
Needle Guard
When the looper point is on the
side opposite to the center line of
theneedle (left needleifthere are
two needles), space between nee-
dleandrear needleguardof ‘A’ is
0mm.When needlemovesto the
lowest position, space between
needle and front needle guard of
‘B’ isfrom0.15to0.20mm,accord-
ingtogure21.
Figure 21
3.9.6
Chain Looper
and Needle
Thesafetyloopershouldbexedin
apositionlowerthanthissupport.
And when it moves to the left far
end,thedistancebetweentheloop-
erpointandthecenterlineofneedle
is2.5mm,accordingtogure22.
Figure 22
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High Speed Overlock Machine |Instructions Manual and Parts List
Maintenance
4.1
Machine
Head Cleaning
Clean the machine head periodi-
callywithadrysoftclothtoremove
theexcessofdustinthehead.Do
notuseanykindofsolventmaterial
tocleanthesurface.
4.2
Oil Change and
Filter Cleaning
Ifthemachinehasnotbeenusedfor
a long time, lubricate the superior
part of the needle bar, guides and
loopers before returning to opera-
tion.
Oil should be changed every four
months.Whenchangingtheoilfol-
lowinstructionsonitem3.3.
Oil lter should be cleaned every
month or replaced for a new one
as necessary.To clean the lter or
changetheoil,followinstructionin
item3.3.
4.3
Safety
Inspection
Frequently check if all safety de-
vices are properly installed and
adjusted.
Checkallscrewsthatxandhold
the machine head that should be
properlytight.
Checkand besure thebelt is not
excessivelywornoutandseethat
ithasthepropertension.
Checkandbesurethereisnomo-
tor overheating and be sure that
the cable and electric connector
arenotdamaged.
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High Speed Overlock Machine |Instructions Manual and Parts List
Troubleshooting
Problems Possible Causes Possible Solutions
Broken needle
1. Needle installed the wrong way. 1. Install the needle correctly.
2. Wrong kind of needle. 2. Use needle adequate for cloth and thread.
3. Damaged needle. 3. Replace for a new one.
4. Wrong relation with needle guards. 4. Adjust needle guards.
5. Wrong relation with looper. 5. Adjust the looper.
6. Needle is not centralized with the hole at the needle
plate or the presser foot.
6. Adjust the needle plate or the presser foot.
Broken thread
1. Low quality thread. 1. Use good quality thread.
2. Thread is thicker than the eye of the needle. 2. Use adequate needle to cloth and thread.
3. Wrong passage of thread. 3. Pass thread correctly.
4. Thread tension too tight. 4. Adjust the thread tension unit.
5. Needle wrongly set. 5. Set needle correctly.
6. Thread stand wrongly set. 6. Set the thread stand correctly.
7. Needle overheating. 7. Fill in silicon oil or adjust needle guards.
8. Tension disk or guides with burrs . 8. Replace the parts.
9. Wrong relation of needle with looper . 9. Adjust the synchronism of needle and looper.
10. Needle, looper, needle plate and guides have burrs. 10. Replace the part.
Failure in stitches
1. Wrong relation of needle with looper. 1. Adjust the relation of needle with looper.
2. Wrong passage of thread. 2. Pass thread correctly.
3. Needle installed the wrong way. 3. Install needle correctly.
4. Inadequate tension of thread. 4. Adjust thread tension button.
5. Point of looper damaged. 5. Replace the part.
6. Needle damaged. 6. Replace for a new needle.
7. Wrong installation of needle guards. 7. Adjust the needle cover.
Skip stitches
1. Wrong threading. 1. Pass thread correctly.
2. Thread is thicker than needle hole. 2. Use proper needle hole for cloth and thread.
3. Wrong thread tension. 3. Adjust the thread tension units.
4. Needle thread is not lubricated. 4. Fill in the silicon oil.
5. Wrong relation of needle with looper. 5. Adjust the needle and looper.
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10
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