Bernina 2500DCET Owner's manual

Instruction Manual

Overlocker / Serger

2500

DCET

Umschlag_GB.indd 1 10.10.2007 16:18:59 Uhr

Safety Instructions

3

IMPORTANT SAFETY INSTRUCTIONS

When using an electrical appliance, basic safety precautions

should always be followed, including the following. Read all

instructions before using this overlock sewing machine.

DANGER

To reduce the risk of electric shock:

1. The appliance should never be left unattended when

plugged in.

2. Always unplug this appliance from the electric outlet

immediately after using and before cleaning.

3. Always unplug before relamping. Replace bulb with the

same type rated max.12 volts/5 watts.

WARNING

To reduce the risk of burns, fire, electric shock or injury

to persons:

1. Do not allow this appliance to be used as a toy. Close

attention is necessary when this appliance is used by or

near children.

2. Use this appliance only for its intended use as described

in this manual. Use only attachments recommended by

the manufacturer as contained in this manual.

3. Never operate this appliance if it has a damaged cord or

plug, if it is not working properly, if it has been dropped

or damaged or dropped into water. Return the appliance

to the nearest authorized dealer or service center for

examination, repair, electrical or mechanical adjustment.

4. Never operate the appliance with any air openings blo-

cked. Keep ventilation openings of the sewing machine

and foot controller free from accumulation of lint, dust

and loose cloth.

5. Keep fingers away from all moving parts. Special care is

required around the sewing needle and knife.

6. Always use the proper needle plate. The wrong plate can

cause the needle to break.

7. Do not use bent needles.

8. Do not pull or push fabric while stitching. It may deflect

the needle causing it to break.

9. Switch the sewing machine off («O») when making any

adjustments in the needle area, such as threading needle,

changing needle, threading looper, or changing presser

foot and the like.

10. Always unplug the machine from the electrical outlet

when removing covers, lubricating or when making any

other user servicing adjustments mentioned in the

instruction manual.

11. Never drop or insert any object into any opening.

12. Do not use outdoors.

13. Do not operate where aerosol (spray) products are being

used or where oxygen is being administered.

14. To disconnect, turn all controls to the off («0») position,

then remove plug from outlet.

15. Do not unplug by pulling on cord. To unplug, grasp the

plug not the cord.

16. Basically, the machine should be disconnected from the

electricity supply when not in use.

17. This appliance is provided with double insulation (except

USA/CANADA). Use only identical replacement parts. See

instructions for servicing of double insulated products.

SERVICING DOUBLE-

INSULATED PRODUCTS

(except USA/CANADA)

In a double-insulated product, two systems of insulation are

provided instead of grounding. No grounding means is

provided on a double-insulated product nor should a means

for grounding be added to the product. Servicing a double-

insulated product requires extreme care and knowledge of

the system and should only be done by qualified service

personnel. Replacement parts for a double-insulated product

must be identical to those parts in the product. A double

insulated product is marked with the words «DOUBLE

INSULATION» or «DOUBLE INSULATED».

The symbol may also be marked on the product.

SAVE THESE

INSTRUCTIONS!

This overlock/cover stitch machine is intended for household

use only.

2500_DCE_1_englisch_neu 09.10.2007 14:32 Uhr Seite 3

4

Congratulations on the purchase of your BERNINA 2500DCET overlocker. You are now

the proud owner of an overlock sewing machine which fulfills every expectation in terms

of use and quality. The unique stitch selection and pre-set tensions make sewing easier

than ever and will give you years of pleasure.

Our comprehensive instruction manual takes you step by step through the features and

handling of your new machine. We also provide you with tips and suggestions for using

the various overlock stitches, roll hem, cover and chain stitch. On the last page of the

manual, you will find a list of optional accessories and BERNINA services which provide

even more scope for getting the most out of your new overlocker.

If you require any further information about your overlocker or sewing in general, please

do not hesitate to contact your BERNINA dealer who will be delighted to help you.

We wish you happy and successful overlocking.

BERNINA INTERNATIONAL AKTIENGESELLSCHAFT

BERNINA International AG, CH-8266 Steckborn

Dear Customer

Hanspeter Ueltschi

President

2500_DCE_1_englisch_neu 10.10.2007 15:23 Uhr Seite 4

Contents

6

11

14

23

24

30

31

35

38

42

48

51

53

55

57

58

59

60

61

67

70

71

72

74

76

77

78

5

Details of the machine

Setting up the machine

Functions and general operating instructions

Needles, thread, fabric

Stitch chart and stitch selection

Threading instructions for overlock, cover/chain stitch and top & bottom cover stitch

Overlock threading

Overlock test sewing and fine tuning

Cover/chain- and top & bottom cover stitch functions and general instructions

Cover stitch threading

Top & bottom cover stitch threading

Top & bottom cover stitch / Cover stitch test sewing and fine tuning

Chain stitch threading (position G)

Chain stitch test sewing and fine tuning

Converting from overlock to cover/chain stitch

Converting from cover stitch position F (4 thread cover stitch) top & bottom cover stitch (position H)

Converting from top & bottom cover stitch (position H) to cover/chain stitch position F

(4 thread cover stitch)

Converting from cover/chain stitch to overlock

Overlock practical sewing, needles and threads

Cover stitch/ top & bottom cover stitch practical sewing

Chain stitch practical sewing

Maintenance

Trouble shooting

Index

Technical information

Optional Accessories

Bernina publications

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 5

Details of the machine

6

View from the front

1 Stitch selection dial

2 Stitch display

3 Cloth plate/free arm

4 Stitch plate

5 Standard presser foot with tape guide

6 Cover stitch extension plate

7 Needle clamp

8 Sewing light

9 Needle stop

10 Safety control light

11 Carrying handle

12 Thread guide

13 Thread guide support

14 Support rod

15 Differential feed dial

16 Stitch length dial

17 Handwheel

18 Foot control socket

19 Machine socket

20 Power switch

21 Looper cover

22 Lower looper fine tuning (purple)

23 Needle R fine tuning (brown)

24 Needle C fine tuning (green)

25 Needle L fine tuning (yellow)

View from the front

26 Wiper fine tuning (grey)

27 Thread guide

28 Thread eyelet

29 Feeding link guide

30 Wiper

31 Finger guard

32 Wiper activating lever

33 Upper knife arm screw

BERNINA 2500DCET cover/chain stitch mode

BERNINA 2500DCET top & bottom cover stitch mode

25 24 23 22

16 15 20 17 19 18

21

12

13

10

9

8

7

3

4

5

6

14

2

1

11

27

28

29

30

33

32

31

26

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 6

Details of the machine

7

View from the front

1 Stitch selection dial

2 Stitch display

3 Cloth plate/free arm

4 Stitch plate

5 Standard presser foot with tape guide

6 Knife guard

7 Needle clamp

8 Sewing light

9 Needle stop

10 Safety control light

11 Carrying handle

12 Thread guide

13 Thread guide support

14 Support rod

15 Differential feed dial

16 Stitch length dial

17 Handwheel

18 Foot control socket

19 Machine socket

20 Power switch

21 Looper cover

22 Lower looper fine tuning (red)

23 Upper looper fine tuning (blue)

24 Needle C fine tuning (green)

25 Needle L fine tuning (yellow)

26 Cutting width dial

27 Roll hem selection lever

28 Cutting lines

29 Waste collector

30 Wiper fine tuning (grey)

31 Thread guide

32 Thread eyelet

33 Feeding link guide

34 Wiper

35 Finger guard

36 Wiper activating lever

BERNINA 2500DCET overlock mode

BERNINA 2500DCET overlock mode (Detailed)

25 24 23 22

16 15 17 19 18

21

12

13

10

9

8

7

6

5

3

4

26

27

28

29

14

11

2

1

20

35

34

36

30

31

33

32

A

3

2

4

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Details of the machine

8

View from the back

38 Thread stand

39 Foam pad

40 Spool stabilizers

41 Spool pin

42 First thread guide

43 Presser foot pressure control

44 Presser foot lifter

45 Light switch

46 Thread cutter

47 Foot control

48 Power cord

BERNINA 2500DCET overlock mode

41

40

39

38

42

43

44

45

46

47 48

Foot control:

Model Nr. YC-425

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 8

Details of the machine

9

View with looper cover open

1 Threading diagram

2 Upper looper (blue)

3 Lower looper (red)

4 Lower looper auto-threader

5 Lower knife

6 Lower knife setscrew

7 Upper knife

8 Conversion arm

Accessories in looper cover

The most important threading and machine accessories are

neatly stored in the looper cover and always to hand.

1 Household needles 130/705H (2x70, 3x80)

2 Small screwdriver

3 Tweezers

4 Brush/needle inserter

5 Needle and looper threader

6 Upper looper converter

7

1

2

3

5

6

4

8

2 3 1 4 6 5

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Details of the machine

10

Accessories

All other accessories are stored in the accessory bag and box.

1 Spool caps

2 Nets

3 Spare knife

4 Bulb holder

5 Large screwdriver

6 Oiler

7 Accessory bag

8 Dust cover

9 Deco guide

10 Seam guide right

11 Needle set JLx2 (3x 80)

12 Cover stitch presser foot *

13 Cover/chain stitch extension plate

14 Standard foot with tape guide

15 Knife guard

* Cover stitch presser foot

Instructions for using the cover stitch presser foot

(compensating foot) are on page 16.

Cover stitch:

Depending on whether your machine is delivered in

overlock or cover stitch mode, either of the accessories

13, 14 or 15 will be attached to the machine.

1

2

3

4

5

6

7

9

8

11

15

10

13

14

12

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 10

Setting up the machine

11

Attaching the foot control

2 1 3

5

4

2500DCET

Plug the foot control into the machine socket (1) on the

right side of the machine. Plug the power cord into the

machine socket (2) and into the mains socket (3).

Sewing speed

Decrease or increase the pressure on the electronic foot

control for fully variable speed control.

The maximum sewing speed for:

Overlock stitch mode A to E 1500 s.p.m.

Cover/chain stitch mode F and G 800 s.p.m.

Top&botom cover stitch mode H 500 s.p.m.

The maximum sewing speeds are automatically set by the

stitch selection dial.

Thread stand

Push the support rod firmly into the socket on the back of the

machine.

Raise the support rod (4) fully, turning slightly until the

positioning catches engage. Position the thread guide (5) on

the thread stand so that it is parallel to the machine.

Warning

This appliance has a polarized plug (one blade wider than

the other). To reduce the risk of electric shock, this plug is

intended to fit in a polarized main socket only one way.

If the plug does not fit fully in the polarized main socket ,

reverse the plug. If it still does not fit, contact a qualified

electrician to install the proper polarized main socket. Do not

modify the plug in any way (for USA, Canada only). For the

BERNINA 2500DCET use only the foot control model YC-425

(USA, Canada).

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 11

Setting up the machine

12

Waste collector

Hang the waste collector onto the opening provided on the

looper cover. It catches the cut-off fabric as you sew,

keeping your working area neat and tidy.

Thread, cones, spools

Cones or domestic spools in all sizes can be used on your

BERNINA overlocker.

Remove the stabilizers for household spools, but secure the

spools with the spool holder caps, rounded side downwards.

When sewing with large industrial spools, use the stabilizers

upside down, i.e. with the wider edge at the top.

Place the stabilizers on the spool pins when using thread

cones.

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 12

Setting up the machine

13

Placing the spool holder for the top & bottom cover stitch thread

Lift the foam pad (A), slide the guide tabs (C) of the spool

holder (B) into the guide of the upperside of the spool holder

from left to right into position (E) and press until tab (D)

clicks into the underside of rib (F).

B

D

C

A

E

F

D

C

E

F

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 13

14

Functions and general operating instructions

1

2

Power switch

The power switch is on the handwheel side of the machine in

front of the machine socket.

O = OFF

I=ON

Light switch

The light switch is positioned on the rear left side of the

machine to the left of the presser foot lifter.

1=ON

2 = OFF

Electronics/Safety/Needle stop

Your Bernina overlocker is equipped with electronic operating

and safety features.

Micro-safety switch:

When the looper cover is open, the electricity supply to the

motor is automatically interrupted. The machine will not sew

but the light remains on for threading etc.

Needle stop:

The Needle stop for overlock stitches (positions A to E) is

generally up, i.e. when you stop sewing, the needle(s) will

stop in their highest position, the ideal position for threading

or changing needles. To lower the needle(s), press the Needle

stop button (3).

The Needle stop for cover and chain stitch (positions F/G/H) is

generally down, i.e. cover and chain stitch formations end

with the needle in the fabric.

Safety control lamp:

The machine will not sew if it has not been prepared

correctly. When the foot control is depressed, the safety

control lamp will light up (4).

The control lamp also lights up when the presser foot is

raised, when the presser foot is swung out or the looper

cover is open.

Safety cut-out

If overheating should occur, the motor will cut-out after

2 seconds, after cooling down, sewing can be continued.

Note:

If you turn the stitch selection dial while sewing, the

control lamp will blink and the machine will stop.

4

3

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 14

Functions and general operating instructions

15

Handwheel

The handwheel turns counter-clockwise as on a household

sewing machine.

Looper cover

To open the looper cover, press to the right and tilt the cover

towards you.

To close the cover, push it up and press lightly to the left and

it will engage automatically.

Cloth plate / free-arm

The cloth plate can be removed to expose the free arm.

To remove pull to the left.

To attach press firmly to the right until it engages.

The free arm is ideal for sewing tubular items such as ribbing,

trousers and sleeve hems.

Two-step presser foot lifter

The presser foot lifter is positioned on the rear of the

machine above the presser foot.

To raise the presser foot, lift the presser foot lifter until it

engages (1).

It can be raised again to maximum height and held in this

position to provide more space between presser foot and

stitch plate for bulky items. (2).

Press the lifter down to lower the presser foot.

Note: When the presser foot is raised, all the tensions

are released making it easier to thread the machine.

WARNING: If sewing in top & bottom cover stitch mode,

when lifting the presser foot to its highest position (2),

do not use any force.

1

2

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16

Functions and general operating instructions

Swing-out presser foot

The swing-out foot (exclusive by BERNINA) provides easy

access for threading needles. It also makes it easier to change

the needles and insert band or elastic into the guide on the

foot.

To swing out:

· Raise the needles (Needle stop).

· Raise the presser foot and swing it out to the left.

To position for sewing:

· Push the foot from left to right until it engages.

· Lower the presser foot.

Note:

The machine will not run when the foot is swung-out.

An additional safety measure to prevent damage to

needle(s) or machine.

Note:

Cover stitch compensating foot:

To prevent damaging the needle points, the cover stitch

foot (accessory) should not be swung out.

Changing the presser foot

· Raise the needles (Needle stop)

· Raise the presser foot.

· Press the catch (1) to release the presser foot from the

clamp (2) and remove it to the left.

1

2

3

To attach the foot, place it under the shaft. The groove in the

shaft should line up exactly with the presser foot pin (3).

Lower the shank and the presser foot engages automatically.

The cover stitch presser foot (compensating foot – accessory)

is used together with the seam guide lines on the extension

plate and for work where precise guiding is necessary.

The cover stitch presser foot consists of a solid centre section

and two spring-loaded side sections. The indents on the

centre section (1) indicate the needle positions and act as

guides.

The spring-loaded side sections (2) guide the fabric and

prevent sideways movement. Perfect for topstitching hems

with elastic, folded edges, seams and ribbings as well as

bindings or sewing on lace or elastic.

Note:

Cover stitch compensating foot: To prevent damaging

the needle points, the cover stitch foot (accessory)

should not be swung out.

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 16

Functions and general operating instructions

17

Stitch length

Every stitch equals one complete feed-dog movement. The

amount of movement is determined by the selected stitch

length.

The stitch length is infinitely variable from 1–4 mm and can

be adjusted while sewing. Simply turn the stitch length dial in

the direction desired.

Most overlock work is done with a basic stitch length setting

of 2.5 mm (marking on the dial).

Most cover stitch work is done with a stitch length of

between 3 and 4.

Cutting width

Adjusting the cutting width for overlock stitches:

Turn the dial in the direction desired. The upper knife adjusts

automatically to the position of the lower knife.

The stitch width of overlock stitches is determined by the

cutting width and the needle(s) in use.

Note cover/chain stitch:

Cover and chain stitches are sewn without knives.

The upper knife and upper knife arm are fully raised

when the machine is in cover/chain stitch mode.

Position of knife: 1 2 3

Needle C: 3 mm 4 mm 5 mm

Needle L: 5 mm 6 mm 7 mm

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18

Functions and general operating instructions

Cutting width

Narrower cutting width:

If the edges of fine fabrics curl when being sewn, reduce the

cutting width by turning the dial to a lower number.

Wider cutting width:

If the loops formed on the fabric edge are too loose, increase

the cutting width by turning the dial to a higher number.

Differential feed

Your BERNINA overlocker is equipped with a front (1) and a

rear (2) feed dog. The two feed dogs move independently,

and the distance each feed dog travels can be adjusted

independently.

2

1

2

1.5

N (1)

0.7

Gathering effect

This is the most common use for differential feed and is to

prevent waving or fluting in knits or puckers in fine woven

fabrics.

The distance travelled by the front feed dog is greater than

that of the rear feed dog.

The front feed dog pushes the amount of fabric which the

rear feed dog can take up unstretched (knit) or unpuckered

(fine wovens) behind the needle(s) (e.g. 1.5 and 2).

Stretching effect

The opposite effect can be produced to prevent fine nylon

jerseys or closely woven fabrics from puckering.

The distance travelled by the rear feed dog is greater than

that of the front feed dog.

The front feed dog holds the fabric back so that the rear feed

dog can take up the fabric (slightly stretched) behind the

needle(s). (e.g. 0.7).

Adjusting the differential feed

Simply turn the dial in the direction desired for fully variable

adjustments while sewing. Test sew.

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 18

Functions and general operating instructions

19

Setting 2 1.5 N 0.7

Effect Gathering effect, Gathering effect, Normal feed Stretching effect,

flat seams flat seams pucker free seams

Overlock Thick or loose Fine to medium Woven fabrics Nylon jerseys,

knits, hand- knits weight knits, e.g. closely woven

sweatshirt, fabrics e.g

velours, interlock Charmeuse,

linings, satin, poplin.

4 thread Thick or loose Fine to medium Knits with the grain Sewing over seams

cover stitch knits, hand-knits weight knits

(5 thread

top & bottom

cover stitch)

3 thread Thick or loose Fine to medium Knits with the grain sewing over seams

cover stitch knits, hand-knits weight knits

(5 thread

top & bottom

cover stitch)

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 19

20

Functions and general operating instructions

Presser foot pressure

The presser foot pressure ensures perfect fabric feed. It is

factory adjusted to a medium setting.

Adjusting the pressure:

Push the lever in the direction desired.

H High pressure: For thick or stiff fabrics such as denim,

tweed, linen and for sewing on elastic.

N Normal pressure: Basic setting for most normal overlock

work.

L Low pressure: For light-weight or sheer fabrics such as

chiffon, georgette, batiste, linings.

Note:

Seams in knitted fabrics will wave if the presser foot

pressure is too high. Always set to «N» when sewing

knits.

Upper knife

Raise the needle(s) to their highest position (needle stop).

Open the looper cover, if sewing in overlock mode.

To raise the knife press the upper knife holder (1) to the right.

Turn the knob (2) clockwise until the knife

locks (3).

To lower, press the holder to the right and turn the dial (2)

counter-clockwise until it engages. The knife

engages in the cutting position.

12

3

2500_DCE_1_englisch_neu 09.10.2007 14:33 Uhr Seite 20

Functions and general operating instructions

21

Needle clamp

BERNINA 2500DCET needle clamp

There are three needle positions (L, C, R) each with its own

fixation screw.

Inserting needles

Needles can be inserted quickly and easily with the practical

needle inserter.

To remove:

· Raise the needles (Needle stop).

· Raise the presser foot and swing out or remove.

Loosen the fixation screw and remove the needle using the

inserter. Place the replacement needle, flat sides towards the

back, into the hole of the needle inserter (1) and insert

the needle in the appropriate hole as far as possible into the

needle clamp (2).Tighten the needle setscrew firmly (3).

Tip:

Insert the needle C first and then needle L. Needle L is

slightly higher than the needle C.

Use needle R for cover and chain stitch.

Needle positions

Needles are inserted into positions L, C or R depending on

the stitch selected, which produces different stitch widths.

Note:

The third needle position (R) is for cover and chain

stitch applications only!

Needle L and C

or Needle L

5–7 mm overlock

Needle C

3–5 mm overlock

2–3 mm roll hem

Needles L, C R

or needle L and R

5 mm cover stitch

Needles L and C

Needles C and R

2.5 mm cover stitch left or right of centre

Needles L, C, and R

5 mm top & bottom cover stitch

Needles L and C

2.5 mm top & bottom cover stitch

Needle R

Chain stitch

Note:

Remove all needle(s) not in use, and their

corresponding thread(s).

L

C

R

1

3

2

2500_DCE_1_englisch_neu 09.10.2007 14:34 Uhr Seite 21

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