Singer 321C - 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 and the Cameo "S" Design are exclusive trademarks of The Singer Company Limited S.à r.l. or its Affiliates.
©2011 The Singer Company Limited S.à r.l. or its Affiliates. All rights reserved.
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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
•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in
thefollowingsituations:
•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main-
tenance.
•When the operator is not run-
ningthemachine.
•In case of lubricant oil contact
with the eyes or skin, wash the
surface with plenty of icy 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ad-
equate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.
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2
High Speed Overlock Machine |Instructions Manual and Parts List
•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
fingers, head, and clothes far
fromwheel,beltandmotorwhen
the machine is running. Nothing
shouldbeplacednearthoseparts.
•To avoid injuries never put your
fingers next to the loopers when
themachineisrunning.
•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
machinetoreplacethebobbin.
•Toavoidpossibleinjuriesbecare-
ful when putting down or lifting
themachinehead.
•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
andthebelt.
•If your machine is equipped with
a servomotor, it does not make
noiseswhilebeingdriven.Toavoid
a possible accident caused by an
unexpectedstart,bevsurethema-
chineisturnedoff.
•To avoid electric, do not run the
machinewithoutproperground-
ing.
•To minimize the risk of accidents
or damages in electric compo-
nentscausedbyelectricdischarge
turn the machine off before un-
pluggingit.
•Cleanthemachineperiodically.
1.2
Safe Operation
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