SINGER 321D User manual

Brand: SINGER

Model: 321D

Category: Sewing machines

Type: User manual

This manual is also suitable for

321K

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.

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

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3 Mounting and Adjustment Instructions

4 Maintenance

5 Troubleshooting

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3.10 41etaR deeF laitnereffiD eht gnitsujdA

3.11 Stitch Length Adjustment

3.12 Parts Relation and Timing

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4.3 71noitcepsnI ytefaS

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

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

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

Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List

2.2

Machine

Speciﬁcation

Table 1 – Machine Speciﬁcation

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

0.7 ~ 2.0

0.8~1.5 7

3.8

24 2

With Direct Drive Servo Motor

13 -

Application

With Clutch Motor

3.8

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

Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List

RR2255

1133

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

RR1166

4400

BBBB

CCCC

AAAA

CC--CC

2255

11..55

BB--BB

2255

1133

AA--AA

3.1

6600

Table Cut-Out

Diagram

Setup and Adjustment Instructions

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.

Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List

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.

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

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.

Fill Silicon

Oil to

Reservoir

Figure 8

Figure 9 (b)

Figure 9 (a)

For 1 needle

For 2 needle

Figure 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.

Replacing

Upper and

Lower Knife

Figure 11

Figure 12 (a)

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

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

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

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.

Open three covers.

Move the presser foot aside.

Knot the preset thread and the

thread being used together to

thread the machine.

Needle thread

Trim the knots off neatly

before passing through

the eye of the needle to

rethread.

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

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

To tighten

2 1

Presser foot

pressure

Figure 18

Figure 19

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

Heavy

Light

should be as light as possible to be

sufﬁcient to obtain the proper stitch

formation.

Stitch Length

Adjustment

Figure 20

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

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

4.1

4.2

4.3

Machine Head

Cleaning

Oil Change

and Filter

Cleaning

Safety

Inspection

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

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SINGER 321D User manual

Brand: SINGER

Model: 321D

Category: Sewing machines

Type: User manual

This manual is also suitable for

321K

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SINGER 321D User manual

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SINGER 321D User manual

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