dorina 77 - Sewing machine PFAFF - Free user manual and instructions

USER MANUAL dorina 77 PFAFF

1. Always beware of the up-and-down movement of the needle and do not turn your attention from the machine while it is running.
2. When changing the needle, the sewing foot, the bobbin or any other parts, always disconnect the machine by pulling the plug out of the wall socket.
3. Do not place anything on the foot control, otherwise the machine will start inadvertently, or the control or motor may burn out.
4. The maximum permissible power for the sewing lamp bulb is 15 watts.
5. When using your sewing machine for the first time, place a piece of waste fabric under the sewing foot and run the machine without thread for a few minutes. Wipe away any oil which may have appeared.

Contents

The parts of Model 72. 4-5

The parts of Model 75.

The parts of Model 77.

Detachable workplate, Models 75 and 77. . . . . . . . . . . . . . . . . . . . . . . . . . . 10

How to use the foot control. 11

The sewing lamp 11

Table of needles, threads and fabrics. 12

Inserting the needle. 13

The stitch selector, Model 72.

The stitch selector, Model 75. 14

The stitch selector, Model 77. 15

Colour code selector. 15

Stitch length selector and reversing button. 16

Regulating the thread tensions.

Regulating the sewing foot pressure (Patch-O-Matic) . . . . . . . . . . . . . . . . . . . 18

Dropping the feed. 18

Removing and inserting the bobbin case and bobbin, Model 72.

.Removing and inserting the bobbin case and bobbin, Models 75 and 77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winding the bobbin 21

How to wind correctly. 22

Threading the bobbin case. 23

Threading the needle thread. 24

Drawing up the bobbin thread. 25

Sewing with straight stitch. 26

How to begin sewing.

How to turn corners. 27

How to finish sewing. 27

Applications for the free arm of Models 75 and 77. 28 29

Sewing tubular - shaped articles on Models 75 and 77 30

Sewing with a twin needle 31

Tricot zigzag stitch, Models 75 and 77. 32

Triple, straight stretch stitch, Models 75 and 77. 33

Feather stitch, Model 77 34

Overlock stitch, Models 75 and 77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-36

Sewing buttonholes 37

Sewing on buttons 38

Sewing in zip fasteners 39

Hemming. 40

Sewing blind hems, Model 72.

Sewing blind hems, Models 75 and 77.

Embroidery 4

Cleaning the shuttle race 4

Cleaning the feed dog 4

How to oil the machine. 4

Drive belt tension. 47-4

Faults and how to remedy them

The parts of Model 72

Technical diagram of a sewing machine with numbered parts for identification

1 Sewing foot pressure regulator (Patch-O-Matic)
2 Bobbin winder tension
3 Take-up lever
4 Thread guide
5 Top cover
6 Spool pins
7 Stitch selector
8 Bobbin winder spindle
9 Bobbin winder stop
10 Hand wheel
11 Stitch length selector
12 Reversing button

13 Bedplate
14 Needle thread tension
15 Needle bar
16 Needle holder with fixing screw
17 Bedplate cover
18 Sewing foot
19 Needle plate
20 Sewing foot fixing screw
21 Presser bar
22 Thread guides
23 Face plate

The parts of Model 75

Technical diagram of a sewing machine with numbered parts for identification

1 Sewing foot pressure regulator (Patch-O-Matic)
2 Bobbin winder tension
3 Take-up lever
4 Thread guide
5 Top cover
6 Spool pins
7 Stitch selector
8 Bobbin winder spindle
9 Bobbin winder stop
10 Hand wheel
11 Stitch length selector
12 Reversing button

13 Bedplate
14 Needle thread tension
15 Needle bar
16 Needle holder with fixing screw
18 Sewing foot
19 Needle plate
20 Sewing foot fixing screw
21 Presser bar
22 Thread guides
23 Face plate
25 Free arm
26 Detachable workplate

The parts of Model 77

Technical diagram of a sewing machine with numbered parts for identification

1 Sewing foot pressure regulator (Patch-O-Matic)
2 Bobbin winder tension
3 Take-up lever
4 Thread guide
5 Top cover
6 Spool pins
7 Stitch selector
8 Bobbin winder spindle
9 Bobbin winder stop
10 Hand wheel
11 Stitch length selector
12 Reversing button

13 Bedplate
14 Needle thread tension
15 Needle bar
16 Needle holder with fixing screw
18 Sewing foot
19 Needle plate
20 Sewing foot fixing screw
21 Presser bar
22 Thread guides
23 Face plate
24 Colour code selector
25 Free arm
26 Detachable workplate

Detachable workplate, Models 75 and 77

The detachable workplate increases the sewing area for ordinary sewing operations.

Removing

Lift the end of the workplate near to the lug and pull it away.

Fitting

Push the workplate over the free arm of the sewing machine until its lug snaps into the notch in the arm.

Note: The detachable workplate is removed to allow sewing of tubular articles.

Line drawing of a sewing machine with a cutting tool and base plate (no text or symbols)

Lug Notch

How to use the foot control

Place the control in a position where you can reach it easily with your foot. Turn the hand wheel towards you and press the pedal down. The harder you press the pedal the faster the machine sews.

The sewing lamp

* Switch

The sewlight switch is found on the back of face plate.

* Changing the bulb

Bulb Type (A): To remove — Turn counter-clockwise

To replace — Turn clockwise

Bulb Type (B): To remove — Push and twist counter-clockwise

To replace — Push and twist clockwise

* Bulb

Use a 15-watt bulb.

Caution!

Before leaving the machine, changing parts or doing any other work on it, always remove the mains plug.

Never place anything on the foot control, otherwise the machine will start unintentionally, or the control or motor may burn out.

Line drawing of a foot pressing down on a mechanical component with a curved arrow indicating motion (no text or symbols)

Diagram showing two mechanical or electrical device configurations with labeled parts and directional arrows indicating rotation or movement.

(A) (B)

Tables of needles, threads and fabrics

Type of Fabric	Thread		Needle
	Type	Size	Size	Point Style
Bed linenFine linenMuslim	Cotton	50 or .60	8070-8070-80	130/705or130/705 H
Dress fabrics, such as brocade,satin ottoman, taffela, georgette,crape, chiffon, batiste, blousefabrics and poplin shirting	Silk	100/3	70-80
	Cotton or mercerizedcotton	60-80
Suttings and mantings'	Silk	100/3	80-90
Twill, denim	Cotton	40	80-100
Heavy linen	Cotton	40-50	80-100
Burlap	Cotton or linenLinen	30-4040	90-100
Terry cloth, chenille goods,knitted pile fabric for bathrobies,corduroy	Cotton	50	70-90
	Silk	100/3
Cotton, rayon staple fabrics	Cotton	50-60	70-80
Jersey fabrics (synthetic)	Synthetic	70-120	70-80	130/705 H
	Cotton	60
Lastex, Helanca fabrics	Synthetic	60-70	70-90	130/705 H
	Silk	40-60
Foambacks	Synthetic	60-70	70-80	130/705 or130/705 H
	Silk	40-60
Jersey fabrics (wool)Woolens	Silk	100/3	80	130/705 H
	Mercerized cotton	60-80	70-90	130/705
Cotton curtainsSynthetic curtains	Mercerized cottonSynthetic thread	60-80120	70-8070-80	130 silk
Acela, leatherette, oilcloth	Cotton	60	80	PCL
Elastic corsetry fabrics, firmcorsetry fabrics, corset satin	Synthetic thread	60	70-90	130/705
	Cotton	40
Leather	CottonLinen	3040	80-100	130 LL
Decorative stitching	Embroidery thread	30-50/80	60-80	130/705
	Heavy embroidery thread		90-100
	Buttohole silk		90-100
	Embroidery andderming thread	70	80
Lycre, rubberizedfabrics	Syntheticor cotton	12060-80	80-90	130/705 SKF

Diagram showing various blade tool configurations with checkmark and cross symbols indicating selection or positioning.

(As to the size of needles, please see rear cover page.)

Inserting the needle

To insert the needle proceed as follows:

Turn the hand wheel towards you until the needle is at the top.

Loosen the needle fixing screw.

Turn the needle with the flat side facing away from you.

Push the needle in its hole as far as it will go.

Tighten the needle fixing screw securely.

Stop ① ② ③

Technical diagram showing hands operating a mechanical device with numbered parts and an arrow indicating direction of movement.

The stitch selector, Model 72

Turn the selector until the symbol of the stitch you require is at the setting mark. If you set the symbols left ☐ or middle ☑ the machine will sew straight stitches with the needle in the left or middle positions.

Set to the range marked www- the machine will sew zigzag stitches of the width selected.

If you are using twin needles the zigzag stitch width must not be set outside the range marked =.

The symbols: □ ▢ ▪ are for sewing buttonholes.

The stitch selector, Model 75

Turn the selector until the symbol of the stitch your require is at the setting mark.

The white symbols are for straight stitch, zigzag stitch and utility stitch seams.

[Figure]

straight stitch, left needle position

[Figure]

straight stitch, middle needle position

V.

zigzag stitches in widths from 1 to 5 mm

If you are using twin needles the zigzag stitch width must not be set outside the range marked = .

14.57

m = 311

Stretch stitch

Stretch blind stitch

三

Overlock stitch

Triple straight stretch stitch

Red symbols

[Non-Text]

Sewing buttonholes without turning the fabric

The stitch selector, Model 77

Turn the selector until the symbol of the stitch you require is at the setting mark.

The white symbols are for straight stitch, zigzag stitch and utility stitch.

○

straight stitch, left needle position

[Figure]

straight stitch, middle needle position

W

zigzag stitches in widths from 1 to 5 mm

If you are using twin needles the zigzag stitch width must not be set outside the range marked =.

A

Stretch stitch

Z

Fancy stitch

A

Stretch blind stitch

Red symbols

Sewing buttonholes without turning the fabric

The blue symbols are for super-utility-stitch seams

Triple straight stretch stitch

W

Triple zigzag stretch stitch, from 1 to 5 mm

Feather stitch

Overlock stitch

Fancy stretch stitch

Colour code selector

Before you begin to sew, set the lever of this control to the colour of the stitch symbol you have selected. The arrow on the lever shows the colour range set.

White and red range

Blue range

Stitch length selector and reversing button

To change the length of the stitches proceed as follows:

Turn the selector so that the number for the required stitch length is at setting mark A. The numbers indicate the stitch lengths in mm. The lower the number, the shorter the stitch.

Sewing backwards*:

To sew backwards, push the reversing button fully in and hold it there until the machine has made the number of stitches you need. When you let go of the button the machine will sew forwards again:

* Reverse sewing is very useful as a means of strengthening or securing a seam.

0 0.5 1 2 3 4 Stitch lengths

A 2 3 0

Hand-drawn diagram of a rotary dial with numbered segments and an arrow indicating clockwise direction

Regulating the thread tensions

needle thread tension correct bobbin thread *The thread tension is normally regulated by altering the needle thread tension.

Correct regulation of the thread tensions is important for obtaining durable and tidy seams. If one of the tensions is not correct, untidy seams will be the result. The tensions are regulated as shown in the illustrations.

Remarks: *The correct tension setting depends on the fabric used. It is best to try out which is the best tension on a piece of waste material.

increase needle thread tension

→

If the bobbin thread runs in a straight line on the underside of the material, the needle thread tension is too loose.

decrease needle thread tension

or

decrease bobbin thread tension

If you cannot remove this fault by increasing the needle thread tension, you may have to decrease the bobbin thread tension as shown in A.

increase bobbin thread tension

If the needle thread runs in a straight line on the top side of the material, the needle thread tension is set too tight. If the latter is set at number 4 or lower this fault should not normally occur. If it does, it is perhaps necessary to increase the bobbin thread tension as shown in B.

Regulating the sewing foot pressure (Patch-O-Matic)

To release the sewing foot pressure, push ring A downwards. This causes the regulator to spring to its highest position. The material is now free of any pressure from the sewing foot.

For sewing thin or light materials push regulator B down just a little to provide the light sewing foot pressure required. If you are sewing thick or heavy materials push the regulator farther down to increase the pressure of the sewing foot on the material.

Technical diagram showing two mechanical assembly steps labeled A and B, with arrows indicating process direction.

Dropping the feed

Embroidering and darning are best carried out with the feed mechanism disengaged. This is done by setting the stitch length selector at ☐, which drops the feed and allows the material to be moved freely under the needle. The feed starts its normal function again as soon as you turn the stitch length selector to "0" or beyond it.

Technical diagram of a rotary dial with labeled segments and pointer

Removing and inserting the bobbin case and bobbin, Model 72

Line drawing of a sewing machine needle stitching fabric, showing hand operating the blade (no text or symbols)

1

Line drawing of a sewing machine needle stitching fabric (no text or symbols)

2

Line drawing of a hand using a sewing machine to adjust a small object (no text or symbols visible)

3

1. Lift the sewing foot by raising the lifting lever.
2. Turn the hand wheel towards you until the take-up lever is at the top.
3. Open the bedplate cover. Lift the bobbin case latch and pull the bobbin case out with the bobbin inside. Release the latch and the bobbin will fall out. As long as you hold the bobbin case latch open the bobbin cannot drop out.

To insert again just reverse the above order.

Removing and inserting the bobbin case and bobbin, Models 75 and 77

1. Raise the sewing foot and turn the hand wheel towards you until the take-up lever is at the top.
2. Open the arm cover.
3. Lift the bobbin case latch and pull the bobbin case out with the bobbin inside. Release the latch and the bobbin will fall out. As long as you hold the bobbin case latch open the bobbin cannot drop out. To insert again just reverse the above order.

Line drawing of a sewing machine needle and base (no text or symbols)

Line drawing of a sewing machine needle with a hand operating the base (no text or symbols)

Line drawing of a hand operating a sewing machine with tools (no text or symbols)

3

Winding the bobbin

Hold the hand wheel firmly with your left hand and undo the locking screw with your right hand (turn towards you).

Place a reel of thread on pin 1. Pass the thread through the eyelet and under the disc of winder tension 2.

Thread the bobbin through one of its holes from the inside outwards and place the bobbin on winder spindle 3.

Push both spindle and bobbin towards the back so that the bobbin winder stop fits into the bobbin.

Now let the machine run until the bobbin stops, then push the spindle away from the stop and cut the thread.

Tighten the locking screw on the hand wheel again.

locking screw

Technical diagram of an electromagnetic device with labeled components and wiring connections

Mechanical assembly diagram showing a pin inserted into a flange with a bolt hole, next to a cylindrical housing and a directional arrow (no text or symbols)

How to wind correctly

The thread must be wound onto the bobbin evenly.

If the thread piles up at the bottom, loosen the fixing screw of the winder tension and set the tension a little higher.

If more thread is wound on at the top of the bobbin, push the winder tension down a little.

After adjustment, do not forget to tighten the fixing screw!

lower higher loosen tighten screw

Set the winder stop so that the bobbin is filled to about 34 with thread. The bobbin must stop turning when the required amount of thread is wound on. If the amount of thread is not correct, loosen the screw and move the winder stop as shown in the illustration above.

Threading the bobbin case

Hold the bobbin between the thumb and forefinger of your right hand and pull off a few inches of thread.

bobbin case bobbin

Hold the bobbin case in your left hand as shown in the drawing and place the filled bobbin inside.

slot

Pull the thread into the slot in the edge of the bobbin case.

tension spring thread eyelet

Now pull the thread under the tension spring and into the thread eyelet.

Inserting the bobbin case

* When inserting the bobbin case in the machine make sure the latch snaps into place property on the steps of (see page 19 and 20).

Technical diagram of a sewing machine with numbered components for identification

Threading the needle thread

Move the take-up lever to its top position by turning the hand wheel towards you.

Lift the sewing foot by raising the presser bar lifter, and thread the machine as follows:

Pass the thread through guides 1 and 2. Hold the reel of thread with your right hand and pass the thread from the right between tension discs 3, and then upwards. When you do so, the thread passes under the tension guide and thread check spring on its own.

Pass the thread from right to left through take-up lever 4, then through thread guides 5 and 6 and through guide 7 at the bottom end of the needle bar.

Thread needle 8 from the front and pull about six inches of thread through the eye.

Technical diagram showing mechanical assembly with labeled components and directional arrows

Technical diagram of a mechanical device with numbered components and rotation arrows indicating motion direction

Drawing up the bobbin thread

needle thread

Hold the end of the needle thread with your left hand. Turn the hand wheel slowly towards you until the needle moves down then up again and the take-up lever is at its highest point.

needle thread bobpin thread

Pull the needle thread slowly. The bobbin thread will now come up through the needle hole in a loop.

bobbin thread needle thread

Pull about four inches of each thread under the sewing foot and through to the back.

Sewing with straight stitch

Sewing foot: . . . . . . zigzag foot

Stitch selector: ..... or

Colour code selector: . . white/red (Model 77)

Stitch length selector: . . 1 to 4

Indications in the different operations concerning the colour code selector only apply to Model 77.

How to begin sewing

Place the material under the sewing foot.

Hold the thread ends loosely with your left hand and turn the hand wheel towards you with your right hand so that the needle enters the material to begin sewing. Let the sewing foot down onto the fabric and press the pedal to start the machine.

Zigzag foot

needle thread

How to turn corners

Stop the machine at the corner so that the needle is down in the material, then lift the sewing foot.

Turn the fabric about the needle.

Lower the sewing foot and continue sewing.

Diagram of a sewing machine needle stitching fabric, showing angle and direction (no text or symbols)

How to finish sewing

At the end of the seam, press the reversing button in order to sew a few securing stitches.

Stop the machine so that the take-up lever is at the top. Lift the presser foot and pull the material out from the back.

Cut the thread using the cutter let into the presser bar, or a pair of scissors. Leave about five inches of thread hanging from the needle eye.

Line drawing of a sewing machine needle stitching fabric (no text or symbols)

Applications for the free arm of Models 75 and 77

Line drawings of fashion items including handbags, dresses, and skirts (no text or symbols)

Here are a few examples of the kind of work you can do with the help of the free arm of your machine.

Sewing tubular-shaped articles on Models 75 and 77

The free arm is particularly suitable for sewing or darning tubular articles such as sleeves, trousers or socks.

Line drawing of a sewing machine with a base and handle, no text or symbols present

Line drawing of a sewing machine needle stitching fabric (no text or symbols)

How to use: Place the article over the free arm, lower the sewing foot and begin to sew, guiding the material lightly with your hands.

Sewing with a twin needle

Pretty coloured patterns can be made by sewing with two needles and different-coloured threads.

Sewing foot: . . . . . . zigzag foot

Stitch selector: ..... range: = 0 to 2

Stitch length selector: . . 0.5 to 1 (for stretch stitch use length "4")

Colour code selector: . . white/red normal

blue stretch

Set the stitch width between 0 and 2 in range = , on the stitch selector, but not higher than 2 or a needle may break. Insert the twin needle in exactly the same way as a single one (flat side away from you).

Place two reels of thread on the spool pins.

The machine is threaded in the same way as with a single thread, except that the threads are divided at the tension, passed between separate discs, separately through the thread guides at either side of needle bar and through the two needle eyes.

Note: Before starting to sew place the two round felts provided in the accessories over the spool pins. To turn a corner with twin needles you have to take the needles out of the fabric or they will be twisted or broken.

The twin needle for this machine has its shank on the left. Needles with their shank in the middle can only be used for straight stitch at needle position middle

Diagram showing a hand holding a tool with a knob and arrow indicating direction, alongside a separate diagram of two blades.

left guide right guide

Line drawing of a sewing machine needle and foot (no text or symbols)

Tricot zigzag stitch, Models 75 and 77

This stitch is very suitable for darning tears. It can also be used for reinforcing stretch materials and sewing on fabric parts.

Sewing foot: . . . . . . zigzag foot

Stitch selector: .....

Colour code selector: . . white/red

Stitch length selector: . . 0.3 to 4

Set the machine as described at the left and begin to sew.

Line drawing of a sewing machine needle stitching fabric, with no text or symbols present

Note:

Use the blue-marked needle in the accessories or a needle with hollow clearance, No. 130/705 H-S. This will prevent stitch skipping.

Triple, straight stretch stitch, Models 75 and 77

If you wish to sew stretch fabrics, this is the right stitch to use to avoid thread breaking. It is also very suitable for seams that need great strength, e.g. crutch seams or pocket seams.

Triple straight stretch stitch

Sewing foot: . . . . . zigzag foot

Stitch selector: . . . . .

Colour code selector: . . blue

Stitch length selector: . . 4

Triple zigzag stretch stitch

Sewing foot: . . . . . . zigzag foot

Stitch selector: . . . . . Wwww

Colour code selector: . blue

Stitch length selector: . 4

Note: Use the blue-marked needle in the accessories or a needle with hollow clearance, No. 130/705 H-S. This will prevent stitch skipping.

Feather stitch, Model 77

This stitch is suitable for fancy effects ...

Sewing foot: . . . . . . zigzag foot

Stitch selector: .....

Colour code selector: . . blue

Stitch length selector: . . 4

... and for sewing stretch fabrics.

Simple line drawing of a rectangular object with a curved base and textured top (no text or symbols)

The image contains no text or characters.

Overlock stitch, Models 75 and 77

With this seam it is possible to provide raw edges, especially on easily fraying fabrics, with a good-looking and lasting edge finish.

Sewing foot: . . . . . . zigzag foot

Stitch selector: .....

Colour code selector: . . blue

Stitch length selector: . . 4

Place the fabric under the sewing foot so that the stitches are made over the edge.

Lower the sewing foot and begin sewing.

Guide the material lightly as shown right.

Sew on a piece of waste fabric to check the stitch setting.

The overlock stitches are placed correctly when the needle just misses the fabric edge when descending on the right.

Line drawing of a sewing machine needle stitching fabric (no text or symbols)

ewing buttonholes

the buttonhole mechanism fitted in this machine makes it possible to sew buttonholes in a short time without by turning of the material.

Sewing foot: . . . . . . buttonhole foot

Stitch selector: . . . .

Colour code selector: . . white/red

Stitch length selector: . . 0.3 to 1,1 (red sector)

change the ordinary sewing foot with the transparent foot for sewing buttonholes.

ark the location and length of the buttonhole on the fabric using a pencil or tailor's chalk.

find out the most suitable stitch length it is best to sew a sample buttonhole in a piece of waste fabric.

for thick fabrics for thin fabrics

buttonhole foot

Sewing buttonholes (continued)

Set the stitch selector at " 1" and sew slowly until the seam is long enough, then stop the machine at B.

Set the selector at "4 2" and sew about five stitches until the needle is at point C.

Set the selector at "3 [1] " and sew until the right seam is as long as the left one, then stop the machine with the needle at point D.

Set the selector at "4 2" and sew about five stitches until the needle is at point E.

To secure the seam, set the stitch selector for zigzag at ☐ and sew a few stitches.

Cut the buttonhole open carefully using a seam ripper, taking care not to damage the end tacks. If you need more prominent buttonholes, use a filler thread.

Please note: before the stitch selector can be moved to another symbol the needle must be at the top.

ewing on buttons

Sewing foot: . . . . . . button sewing foot

Stitch selector: .....

stitch width: . . . . . . . depending on holes in button

Colour code selector: . . white/red

Stitch length selector: . .

Exchange the ordinary sewing foot with the button sewing foot.

Place a button on the material so that its holes are crosswise to the sewing direction and the left hole is under the needle.

Set the stitch selector at "☐" and turn the hand slowly towards you. Make sure the needle enters the left hole.

Lower the button sewing foot onto the button.

at the stitch selector at a stitch width that allows the needle to enter the right hole in the button when you turn the hand wheel.

ow five or six stitches slowly.

at the stitch selector at "●" and sew three or four securing stitches.

case note: move the needle to the top before setting the stitch selector to the right width.

Stitch width

Sewing in zip fasteners

Sewing foot: . . . . . . zip foot

Stitch selector: ..... or

Colour code selector: . . white/red

Stitch length selector: . . 1 to 4

Move the needle to the top and screw on the zip foot.

Loosen the screw on the zip foot and set the foot so that the needle can enter into the left hole. Tighten the screw again.

Now sew on the right half of the zip.

Set the needle at the top again, loosen the screw and move the sewing foot to the left so that the needle can enter the

right hole. Tighten the screw on the sewing foot. Now sew on the left half of the zip.

zip foot

screw right needle hole

lemming

hemmer

Sewing foot: . . . . . . hemmer

Stitch selector: .....

Colour code selector: . . white/red

Stitch length selector: . . 2 to 4

fold over the fabric edge by about 18 " and place it under the foot. Secure the folded edge with a few stitches, take out the workpiece and draw the hem into the hemmer foot by pulling on the threads. Lower the sewing foot and sew the hem. During sewing, fold the fabric to the left a little and allow it to run into the hemmer foot.

Make sure that the fabric does not move under the right half of the foot. The fabric must be fed into the scroll of the hemmer sufficiently so that the workpiece edge runs freely through the notch of the foot.

Close-up of a sewing machine needle stitching fabric (no text or symbols visible)

Close-up of hands operating a sewing machine needle (no visible text or symbols)

Sewing blind hems, Model 72

Sewing foot: . . . . . . zigzag foot

Stitch selector: ..... Wwww

stitch width 3 to 5 mm

Stitch length selector: . . 2 to 4

Attachment: . . . . . . blind stitch hemmer

Turn the hand wheel until the feed dog is below the needle plate surface. Lower the sewing foot.

Loosen the sewing foot fixing screw in order to place the hem guide between the screw and the sewing foot.

Tighten the sewing foot fixing screw and make sure guide A is in the middle of the two prongs of the sewing foot.

Place the fabric with the wrong side up and fold the hem over to the required width (No. 1).

Fold the fabric over again so that the lower fold protrudes by about 5 mm (5/32") (No. 2).

Place the workpiece under the sewing foot so that the double folded edge is up against the hemmer guide.

Lower the presser foot and sew, making sure the double folded edge C runs along the guide.

Fold the fabric apart. The hem (No. 3) is now finished.

40

Technical diagram of a sewing machine with labeled parts A, B, and C, showing mechanical components and alignment indicators.

Sewing blind hems, Models 75 and 77

Sewing foot: . . . . . . zigzag foot

Stitch selector: .....

Colour code selector: . . white/red

Stitch length selector: . . 2 to 4

Attachment: . . . . . . blind stitch hemmer

Turn the hand wheel until the feed dog is below the needle plate surface. Lower the sewing foot.

Loosen the sewing foot fixing screw in order to place the hem guide between the screw and the sewing foot.

Tighten the sewing foot fixing screw and make sure guide A is in the middle of the two prongs of the sewing foot.

Place the fabric with the wrong side up and fold the hem over to the required width (No. 1).

Fold the fabric over again so that the lower fold protrudes by about 5 mm (5/32") (No. 2).

Place the workpiece under the sewing foot so that the double-folded edge is up against the hemmer guide.

Lower the sewing foot and sew, making sure the double-folded edge C runs along the guide.

Fold the fabric apart. The hem (No. 3) is now finished.

A hem guide B C

Embroidery

Remove sewing foot

Stitch selector: ..... Wwww stitch width 3 to 5

Colour code selector: . . white/red

Stitch length selector: . . #

Place the fabric in an embroidery hoop. Set the stitch length selector at "##". Lower the sewing foot. Hold the embroidery hoop firmly with both hands.

While you are sewing the pattern move the embroidery hoop slowly and do not allow your fingers to get near to the needle. (Set the needle thread tension a little looser so that the bobbin thread is not pulled through to the top side). *The required embroidery pattern can be marked on the fabric with a pencil or tailor's chalk.

embroidery hoop

Illustration of a medical procedure showing hands performing a procedure with instruments (no text or symbols visible)

Cleaning the shuttle race

This machine is equipped with a shuttle race cleaner, which means it will be seldom necessary to clean the shuttle race. However, should it be necessary to check the race, proceed as follows:

Move the needle bar to its top position. Open the bedplate cover or the arm cover and take out the bobbin case.

Turn both catches outwards and take out the shuttle race ring.

Carefully remove the shuttle and clean the inside of the shuttle race with a soft brush.

To replace the parts just reverse the above procedure.

Even very slight damage to the shuttle or shuttle race can make both parts unusable.

catch shuttle race cleaner catch shuttle shuttle race ring bobbin bobbin case

Cleaning the feed dog

In order to make sure there are no disturbances in operation of the machine it is important to clean the feed dog of dust and thread waste as often as possible.

Remove the needle plate as shown in the illustrations on the left.

Clean the feed dog with a brush as shown on the right.

Replace the needle plate.

Note:

After cleaning, apply one or two drops of sewing machine oil to the holes as shown in the illustration on the right above.

Line drawing of a sewing machine needle and screwdriver (no text or symbols)

Mechanical assembly diagram showing a tool interacting with a component (no text or symbols visible)

Line drawing of a sewing machine needle and base with arrows indicating movement (no text or symbols)

Technical line drawing of a mechanical assembly with no visible text or symbols

How to oil the machine

The oil holes are marked with arrows in the illustrations below. Before oiling, they should be wiped clean. Apply one or two drops of a non-resinous sewing machine oil. If the machine is in constant use, this should be done every two or three days. If the machine should not run well after being out of use for a long period, apply a few drops of paraffin (kerosine) to the oil holes and run the machine fast with all covers on for about one minute. Before using the machine again oil it in the usual way. After oiling do not forget to sew first on waste fabric in order to soak up any excess oil.

Mechanical sewing machine component (no visible text or symbols)

Model 72, 75, 77

Cross-sectional diagram of a vehicle showing internal components and structural elements (no text or labels)

Model 72, 75, 77

Technical line drawing of a mechanical device with internal components (no visible text or symbols)

Model 72

Drive belt tension

If the motor no longer drives properly or the drive belt has just been renewed, the drive belt tension has to be adjusted. To do this:

Unscrew and take off the belt cover

Loosen the fixing screw of the motor bracket (see ill. below).

Push the motor bracket downwards to a position in which you can push the belt inwards by about 5 mm (3/16") (see ill.), then tighten the screw again.

Caution: never adjust the belt too tight or you may damage the motor or the machine!

5mm (3/16")

Faults and how to remedy them:

Needle thread breaks
Cause:	Remedy:
Needle not properly threadedThread tension too tightSomething is wrong with the needleThread is too heavy for needleThread check spring is brokenNeedle not properly insertedNeedle plate, shuttle or sewing foot damaged	Thread properlyLoosen tensionReplace needleChangeHave a new spring fittedInsert needle properlyReplace
Bobbin thread breaks
Bobbin thread entangled because of incorrectly wound bobbinBobbin thread not under tension spring on bobbin case	Wind bobbin correctlyThread bobbin correctly
Stitches are left out
Needle not properly fitted on needle barNeedle bent or bluntNeedle worn	Fit needle properlyReplaceReplace
Needle breaks
Needle bentNeedle not properly fittedFabric too heavy or too hardYou are pulling on the fabric	ReplaceFit needle properlyUse needle of correct sizeDo not pull

Faults and how to remedy them

Thread forms loops
Cause:	Remedy:
Thread tension not properly regulatedNeedle thread not properly threaded and/or bobbin threadnot properly woundThread size not suited to fabricThread check spring not working properly	Read instructions for regulating needle- and bobbin thread tensionThread machine properly and/or wind bobbin thread correctlySee "Fabrics, threads, thread sizes and needles"Have spring replaced
Shrinking or puckering of the seam
Tension too tightSewing foot pressure too strong	Read instructions for regulating needle- and bobbin thread tensionsRead instructions for regulating sewing foot pressure
Irregular stitches
Needle- and bobbin thread of poor qualityBobbin thread unevenly wound	Use top quality threadsRe-wind bobbin
Machine does not run freely and makes a noise
Machine needs oilingDust and thread in shuttleWrong oil used, has now clogged machineDrive belt tension too tight	Read instructions on how to oilRead instructions on how to clean shuttle raceClean machine carefully and re-oil with top quality oilLoosen tension of drive belt

Size of needles
U.K.	W. Germany	U.S.A.	U.K.	W. Germany	U.S.A.
3	40		19	120	046
4	45	019	20	125	048
5	50	019	21	130/140	051
6	55	022	22	150/160	054
7	58/60	022	23	170	067
8	62	025	24	180/190	073
9	65	027	25	200	080
10	70	029	26	230	090
11	75	030	27	250	100
12	80	032	28	280	-
13	85	034	29	300	120
14	90	036	30	-	-
15	95	038	31	350	140
16	100	040	32	380	156
17	105	040	33	400	156
18	110/115	040	34		172