Singer 321K, 321D User Manual
Instruction Manual
and Parts List
Ultra High Speed Overedge
and Safety Stitch Machine
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
® Singer is a registered trademark of The Singer Company Limited or its affiliated companies.
© 2010 Copyright The Singer Company Limited
Contents
1.1 1snoitcurtsnI ytefaStnatropmI
1.2 For S 2noitarepO efa
2.1 3noitpircseD tcudorP
2.2 4noitacfiicepS enihcaM
2.3 5snoitacfiicepS tleB-V dna yelluP rotoM ,rotoM
3 Mounting and Adjustment Instructions
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
4 Maintenance
4.1 71gninaelC daeH enihcaM
4.2 71gninaelC retliF dna egnahC liO
4.3 71noitcepsnI ytefaS
5 Troubleshooting
1snoitcurtsnI ytefaS1
3noitacfiicepS enihcaM dna noitpircseD tcudorP2
6
15
16
17
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
Safety Instructions
1.1
Important Safety
Instructions
Important
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.
• Before running the machine, make
sure all relevant safety specifications are adequate to specifications and technical standards in
your country.
• The machine should not be run
without its safety devices.
• The machine should only be operated 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 needle or replacing the bobbin or
looper.
• Replacing the needle, presser
foot, throat plate, feed dog and
sliding plate.
• When the machine is in maintenance.
• When the operator is not running 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.
• Maintenance and repair on electric equipment should only be
made by qualified personnel. If
any electric device is damaged,
the machine should be immediately stopped.
• Before starting the machine in full
running, a test must be conducted
to assure that machine and operator are able to perform the task.
• The machine should not be placed
next to a sound source as an ultrasonic 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 indications of use should be followed.
Singer will not be held responsible
for any damage caused by unauthorized changes in the product.
• Repair, fitting or maintenance
should only be performed by
properly trained personnel.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
1
1.2
For Safe
Operation
• 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,
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 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.
head and clothes far from
• 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 machine 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 unplugging it.
• Clean the machine periodically.
• To avoid accident in case of a sudden start of the machine always
turn it off when laying it down, or
remove the belt cover and the belt.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
2
2.1
Product
Description
Product Description
and Machine Specification
Ultra high speed overedge and safety stitch machines
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
3
2.2
Three-thread back latch overlock machine
Four-thread back latch overlock machine
Five-thread overlock machine
Three-thread handkerchief edging (rolled hem)
overlock machine
5
-
Machine
Specification
Table 1 – Machine Specification
Application
Three-thread overlock m achine with vertical chain
cutter and AFL device
Three-thread handkerchief edging (rolled hem)
overlock machine
Four-thread overlock m achine with vertical chain
cutter and AFL device
Five-thread overlock machine with vertical chain
cutter and AFL device
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
Three-thread overlock m achine with vertical chain
cutter and AFL device
Four-thread overlock m achine with vertical chain
cutter and AFL device
Five-thread overlock machine with vertical chain
cutter and AFL device
Five-thread overlock machine with horizontal chain
cutter and AFL device
Five-thread heavy duty overlock machine with
horizontal chain cutter and AFL device
5
Needle Gaug e Overedge Big ht Stit ch Length Presser Foot Lift Singer Speed
0.7 ~ 2.0
Differential Rate
3.8
[mm] [mm] [mm] [mm] Needle Cat [spm]
Threads
Needles
13
2
24
3
25
0.8~1.5 7
5
13 -
0.7 ~ 2.0
24 2
3.8
3
25
0.8~1.5 7
5
Singer Model
321D-131M-04 4 6120-06 75/11 8500 Three-thread overlock m achine
321D-131M-04 / KS 4 6120-06 75/11 8500
321D-132M-015 1.5 6120-06 65/9 8500
321D-134M-04 4 6120-06 75/11 7500
321D-241M-24 4 6120-06 75/11 7500 Four-thread overlock m achine
321D-241M-24 / KS 4 6120-06 75/11 7500
321D-244M-24 4 6120-06 75/11 7500
321D-251M-35 5 612 0-06 90/14 7500
321D-251M-35 / KH 5 6120-06 90/14 7500
321D-251M-55 5 612 0-06 90/14 7500 Five-thread overlock m achine
321D-251M-55 / KH 5 6120-06 90/14 7500
321D-251H-56 6 6120-06 130/21 6500 Five-thread heavy duty overlock machine
321D-251H-56 / K H 6 6120-06 130/21 6500
321K-131M-04 4 6120-06 75/11 8500 Three-thread over lock machine
321K-131M-04 / KS 4 6120-06 75/11 8500
321K-132M-015 1.5 6120-06 65/9 8500
321K-134M-04 4 6120-06 75/11 7500 Three-thread back latch overlock machine
321K-241M-2 4 4 6120-06 75/11 7500 Four-thread over lock machine
321K-241M-2 4 / KS 4 612 0-06 75/11 7500
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 5 612 0-06 90/14 7500
321K-251M-55 5 6120-06 90/14 7500 Five-thread overlock machine
With Clutch Motor
With Direct Drive Servo Motor
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
321K-251M-55 / KH 5 612 0-06 90/14 7500
321K-251H-56 6 6120-06 130/2 1 6500 Five-thread heavy duty overlock machine
321K-251H-56 / K H 6 6120-06 130/2 1 6500
4
2.3
Motor,
Motor Pulley
and V-Belt
Specifications
2.3.1 For 321D series
½ HP 2-pole clutch motor
Motor pulley diameter
M type v-belt
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
2.3.2 For 321K series
Table 2
Motor Pulley Diameter [mm]
Direct drive servo motor and control system.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
5
3
3.1
Table Cut-Out
Diagram
Setup and Adjustment Instructions
RR1166
4400
65
RR2255
6600
RR2255
1133
65
662255
447755
331100
229955
11006655
20
222255
221100
118855
BBBB
3322
115555
4400
4455
4488
RR2244
111177..99559977..3311
114411
111155
9955
5500
RR2244
CCCC
4477
225500
AAAA
4400
9988
111100
5555
335588
334455
224400
AA--AA
2255
CC--CC
11..55
2255
BB--BB
2255
33
99
1133
111188..55
113388119900
555500
Figure 1
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
6
3.2
Machine
Installation
Install the machine support components 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 fullysubmerged assembly, the distance
is around 5.0 mm.
3
10
2
1
9
4
5
7
8
11
Figure 2
12
6
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
7
3.2
Machine
Installation
Mount the machine head over the
machine support plate.
Connect the machine handwheel to
the clutch motor with the v-belt (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 turning direction is clockwise, referred
to the Figure 3.(for 321D only)
2cm
Figure 3
Set the pedal of the clutch motor to
the left side and the pedal of the
presser foot lift at right side.
Install the belt cover according to Figure 4.(for 321D only)
Install the thread stand referred to
the parts list.
Figure 4
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
8
3.3
Lubrication
and Oil
Drainage
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.
H
L
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.
Figure 5a Figure 5b
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.
Figure 6 Figure 7
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
9
3.4
Fill Silicon
Oil to
Reservoir
When sewing in ultra high speed,
fill the device with silicon oil in
order to prevent needle thread
breakage and fabric damage. As
show on Figure 8.
3.5
Needle
Attachment
(or Replacement)
Figure 8
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
For 1 needle1For 2 needle
1
Figure 9 (a)
OK!
needle).
Insert the needle with its long
groove facing towards you and
push it up until the bar end..
Tighten screw ‘1’.
Insert the needle to
the proper depth.
Figure 9 (b)
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
Figure 10
10
3.6
Replacing
Upper and
Lower Knife
Replacing the upper knife
1. Loosen screw ‘1’. Move lower
knife holder ‘2’ to the extreme left
position. Tighten screw ‘1’ temporarily.
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 overedge width (Figure 11).
3. Overlap the cutting edges of the
upper and lower knives so that midpoint ‘A’ on upper knife ‘4’ and the
midpoint of lower knife ‘6’ are
crossed (Figure 12). Loosen screw
‘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.
8
3
4
2
1
5
4
6
Figure 11
7
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” procedures 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.
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.
4
0.5~1.0mm
6
4
6
Top surface
of the needle
plate
Figure 12 (a)
A
Top surface
of the needle
plate
Figure 12 (b)
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
11
3.7
Machine
Threading
Important
Refer to the sewing type you need for correct threading.
Any incorrect threading may cause thread brake, uneven
stitches or skip stitches.
3.7.1
Easy
Threading
Method
Needle thread
Trim the knots off neatly
before passing through
the eye of the needle to
rethread.
1
Open three covers.
Move the presser foot aside.
Knot the preset thread and the
thread being used together to
thread the machine.
2
3
Make sure the machine is
threaded correctly by
referring to the threading
diagram.
3.7.2
Threading
Diagram
Looper thread
Trim the knots off neatly
after passing through the
yey of the looper.
For three / four thread machine
Figure 14 Figure 15
4
Figure 13
For five thread machine
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
12
3.8
Thread Tension
Adjustment
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.
3
4
2
2 1
3
4
5
Figure 16
3
4
2
1
2
3
4
1
To loosen
1
Figure 17
To tighten
3
2
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
13
3.9
Presser foot
pressure
Loosen adjusting nut ‘1’ of Figure
18 and turn adjusting bar ‘2’ to
adjust the presser foot pressure.It
should be as light as possible to be
sufficient to obtain the proper stitch
formation.
3.10
Adjusting the
Differential
Feed Rate
2
1
Light
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 differential feed dog, the fabric is stretched
Heavy
Figure 18
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.
2
To shrink
1
Figure 19
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
To stretch
14
3.11
Stitch Length
Adjustment
Important
The stitch length
adjustment is
made according
to the sewing
fabric, differential
feed ration and
other factors.
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.
Aligning Mark
Coarse
Fine
Handwheel
Push Button
Figure 20
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
15
3.12
Upper looper
holder left
limit position
(e)
(Figure 23)
3,4 Thread
5 Thread
Parts Relation
and Timing
Top surface of the
(a)
needle plate
Figure 21
Figure 24
(c)
(e)
(b)
(d)
(a)
Figure 22 Figure 23
(g)
Top surface of the
needle plate
(h)
Figure 25
(f)
Top surface of the
needle plate
Figure 27
Figure 26
Upper looper
needle
Lower looper
left limit
position
(Figure 22)
Upper looper
left limit
position ( c )
(Figure 23)
Height of
upper looper
( c )
(Figure 23)
Upper looper
holder install
direction
Model
321D & 321K
-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-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 11.9 4.2 5.0~5.3 12 14.5 Left 1.7 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
Height of
(Figure 21)
Chain looper
left limit
position (f)
(Figure 24)
Height of feed
dog (g)
(Figure 25)
Feed dog
Height of
auxiliary feed
dog (h)
(Figure 27)
Feed
eccentric
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
16
4
4.1
Machine Head
Cleaning
Maintenance
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.
Figure 28
4.2
Oil Change
and Filter
Cleaning
4.3
Safety
Inspection
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.
(Operating)
OK!
Figure 29
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.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
17
Troubleshooting
Problems Possible Causes Possible Solutions
Broken needle
Broken thread
Skip stitches
Failure in stitches
1.
Needle installed the wrong way.
2.
Wrong kind of needle.
3.
Damaged needle.
4.
Wrong relation with needle guards.
5.
Wrong relation with looper.
6.
Needle is not centralized with the hole at the needle
plate or the presser foot.
1.
Low quality thread.
2.
Thread is thicker than the eye of the needle.
3.
Wrong passage of thread.
4.
Thread tension too tight.
5.
Needle wrongly set.
6.
Thread stand wrongly set.
7.
Needle overheating.
8.
Tension disk or guides with burrs .
9.
Wrong relation of needle with looper .
10.
Needle, looper, needle plate and guides have burrs.
1.
Wrong relation of needle with looper.
2.
Wrong passage of thread.
3.
Needle installed the wrong way.
4.
Inadequate tension of thread.
5.
Point of looper damaged.
6.
Needle damaged.
7.
Wrong installation of needle guards.
1.
Wrong threading.
2.
Thread is thic
3.
Wrong thread tension.
4.
Needle thread is not lubricated.
5.
Wrong relation of needle with looper.
ker than needle hole.
1.
Install the needle correctly.
2.
Use needle adequate for cloth and thread.
3.
Replace for a new one.
4.
Adjust needle guards.
5.
Adjust the looper.
6.
Adjust the needle plate or the presser foot.
1.
Use good quality thread.
2.
Use adequate needle to cloth and thread.
3.
Pass thread correctly.
4.
Adjust the thread tension unit.
5.
Set needle correctly.
6.
Set the thread stand correctly.
7.
Fill in silicon oil or adjust needle guards.
8.
Replace the parts.
9.
Adjust the synchronism of needle and looper.
10.
Replace the part.
1.
Adjust the relation of needle with looper.
2.
Pass thread correctly.
3.
Install needle correctly.
4.
Adjust thread tension button.
5.
Replace the part.
6.
Replace for a new needle.
7.
Adjust the needle cover.
1.
Pass thread correctly.
2.
Use proper needle hole for cloth and thread.
3.
Adjust the thread tension units.
4.
Fill in the silicon oil.
5.
Adjust the needle and looper.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
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Troubleshooting
Problems Possible Causes Possible Solutions
Uneven Stitches
Puckering
Poor
chain-off stitches
1.
Wrong threading.
2.
Wrong installation of thread stand.
3.
Wrong setting of lower knfe.
4.
Knives does not cut perfectly.
5.
Thread guide or tension disc with burrs.
6.
Needle point damaged.
7.
Inadequate height of feed dog.
8.
Inadequate thread tension.
1.
Thread tension is too strong.
2.
Inadequate pressure on presser foot.
3.
Inadequate height of feed dog.
4.
Knives does not cut perfectly.
5.
Differential feed is not correct.
6.
Needle is too thick.
1.
Incorrect presser foot.
2.
Inadequate synchronism of lopper cam.
3.
Chain stitch looper installed wrongly.
4.
Wrong passage of thread.
5.
Thread tension inadequate.
6.
Wrong relation of needle with looper.
7.
Needle plate or presser foot with burr.
8.
Rough thread tension disc.
1.
Threading correctly.
2.
Install thread support correctly.
3.
Adjust lower knife correctly.
4.
Adjust or replace knives.
5.
Replace the part.
6.
Replace the needle.
7.
Adjust the height of feed dog.
8.
Adjust thread tension.
1.
Adjust thread tension.
2.
Adjust pressure on presser foot.
3.
Adjust the height of feed dog.
4.
Adjust or replace knives.
5.
Adjust differential feed ratio.
6.
Use proper needle to cloth and thread.
1.
Adjust presser foot correctly.
2.
Adjust looper cam.
3.
Adjust looper correctly.
4.
Pass thread correctly.
5.
Adjust thread tension.
6.
Adjust relation of needle with looper.
7.
Replace the part.
8.
Polish thread tension disc.
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
19
Parts list
6.1
Machine
Bed Frame
Components
1
4
2
3
11
9
5
6
8
7
12
10
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
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6.1
3thread 4thread 5thread
1 P03010 Pin 1 1 1
2 P03017 Pin 1 1 1
3 20711001 Indicator guide 2 2 2
4 20713027
5 P03018 Pin 1 1 1
6 20628023 Plug 1 1 0
7 20701002 Bracket Assembly 1 1 1
8 207S13003 Screw 2 2 2
9 206S30001
10 P03019 Pin 1 1 1
11 20126001 Pin 1 1 1
12 20726009 Pin (for 321D-251H only) 0 0 1
Machine
Bed Frame
Components
No. Part No. Description
Pipe
Qty
222
Bed pin
444
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
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6.2
Machine Cover
Components (1)
5
6
2
40
1
39
13
4
3
12
37
15
17
40
7
10
34
8
33
11
9
26
24
36
38
30
31
27
16
29
28
35
21
25
40
38
32
Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List
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19
20
22
23
24
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