National Sewing Machine Co B350 User manual

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MODE L VXs65/SE305
E NG LISH
191565-0-15
PRINTED IN TAIWAN

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CONTENTS
2
4
5
II
1.1 Knowing Your Sewing
Machine 2
PRINCIPAL PARTS,
ACCESSORIES
INSTALLING MACHINE HEAD. . . .
OPERATING YOUR SEWING
MACHINE
Connecting plugs . .
Controll ing sewing speed.
VARIOUS CONTROLS.
Pattern dial
Stitch length dial . . .
Stitchwidthdial ... ....... '.
Reverse sewing lever
Height of feed dog. .
PRESSER FOOT. ,
NEEOLE. .......8
Howtochangetheneedle. . . . . . . . I
How to check the needle. , . . 8
Twinneedle .... I
Goldenstretchstitchneedle. . . . . . . I
NEEDLE PLATE. .......10
RELATIVE CHART OF SEWING
MATERIAL, NEEDLE AND THREAD . 1O
SEW-LIGHT. ....11
Sew-lightswitch knob . /:, .. , . .11
Howtochangethebulb . . . . . . . . .11
UPPER (NEEDLE} THREAD . . . . . .12
LOWER (BOBBIN} THBEAD, ., . . . 13
Howtowindbobbin. .....13
How to remove and insert bobbin
case, .....,.14
Howtothreadbobbin.case ., . . . . . 14
Howtopulluplowerthread. . . . . . 15
THREADTENSION. .,..,16
Upperthreadtension. ....16
Lowerthreadtension. ....16
2.lStraight Stitching 18
How to start sewing ! , ,
How to change s'ewing direction
How to finish your sewing project
How to remove f inal sewing f rom
machine .
How to sew very thin material
How to guide your material
3.|Zigzag Stitching 20
Simple zigzag stitch
Satin stitch
4.1 Decorative Stitches 21
5.1 Buitt-in Stitches 22
Triplestretchstitch ....22
Elasticoverlockstitch .l.ZZ
Elasticstitch ...23
Blind'ltitch ....24
Scallopstitch ...25
6.1 Buttonholes and
Button Sewing 26
Buttonholes ....26
Buttonsewinq ........28
T.lAttachments 29
Narrowhemming. ...29
Zipperinsertion ...30
Darning' ......31
Clothguide . . . .31
S.lVarious Other Stitches 32
20
20
5
5
5
6
6
6
7
7
7
8
Gathering
Attaching lace
Appliqueing
Cord ing
Monogramming and embroidering
32
32
33
33
34
9.1 Maintenance and Care
of Your Machine 35
- Cleaning ......35
18
18
19
19
19
19
How to oil sewing machine
Check list for better sewing ....36
....38
-1-
Repackingthemachine . . . . . . . . .39

Knowing Your Sewing Machine
@
@
@-@ @
@
@
1. Stitch Length Dial
2. Stitch Width Diat
3. Thread Take-up Lever
4. Face Plate
5. Upper Thread Tension Dial
6. Slide Plate
7. Feed Dog Button
8. Pattern Dial
9. Reverse Sewing Lever
10. Thread Cutter
1 1. Presser Foot Screw
12. Presser Foot (Zigzagl
1 3. Needle Ptate lZigzagl
14. Shuttle Hook
1 5. Bobbin Case
16. Feed Dog
17. Needle
18. Needle Clamp Screw
19. Threid Guide and Bobbin Winder Disc
20. Spool Pins
21. Bobbin Winder Device
22. Balance Wheel
23. Stop Motion Knob
24. 3-prong Socket
25. Presser Foot Lifter
26. Sew-light Switch Knob (Button)
-2- -3-

J Accessories I
The following accessories are provided with your sewing machine. These accessories are design-
ed to help you sew easily and perfectly. For more details, see each page listed. lnstalling Machine Head
1. Loosen two s6t screws to
permit hinge pins located
in the back of the cabinet
or base of portable case
to enter.
2. lnsert hinge pins into 3. Tighten
. openings at the back of securely.
sewing machine bed.
1. Straight Stitch Foot
2. Straight Stitch Needle plate
3- Narrow-hemmer Foot
4. Euttonhole & Button Sewing Foot
5. Daring Foot
6. Zipper Foot
7. Cloth Guide with Screw
8. Needle Pack (A)
1O. Bobbins
11. Sew{ight Bulb
12. Seam Ripper
13. Screw Driver (Large & Small)
14. Oiler
(Regular Single Needle No. 14 ..... 3 pcs.)
9. Needle Pack (B) 1 set
(Twin Needle ..... 1 pce.
Golden Stretch Stitch Needle ..... 2 pcs.)
pce.
pce,
pce.
pce.
pce.
set
set
4 pcs.
1 pce.
1 pce.
2 pcs.
1 pcc.
See page
18
18
29
26 &28
31
30
31
8
I
13
11
27
36&37
Operating Your Sewing Machine
CONNECTING PLUGS
1. First connect the three-prong plug into
the machine.
2. Then connect the electric supply plug
into a wall outlet.
Caution
When changing needle, bobbin or
light bulb, or when sewing machine is
not in use, it is recommended that
electrical supply plug is disconnected
to avoid electrical hazards.
CONTROLLING SEWING SPEEO
P,lace foot on foot control as shown in
i I lustrat ion.
When foot control is pushed down lightly,
. machine will run at a low speed.
When pressure on foot control is increased,
machine will pick up speed.
When foot control is released, machine will
stop.
NOTE:
1. Care should be taken that nothing is placed on foot control when machine is not in use.
2. A new sewing machine or one that has not been in use for a long period of time should be
oiled as per instruction on pages 36 and 37. After oiling be sure to wipe up any excess oil.
The above illustrated accessories are provided with this machine.
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-4- -5-

STITCH WIDTH D]AL
PATTERN OIAT
0
LENGTH DIAT
Your built-in pattern sewing machine enables
you to obtain perfect buttonholes and
various utility stitches, such as triple stretdh
stitch, elastic stitch. etc., by simply solect-
ing the pattern on this dial.
1. Raise needle to its highest position,
2. Simply turn the dial and set the pattern
you desire at the setting point.
NUMBERS AND 6TIiCHES OF PATTERN
1. General zigzag Stitch and Straight
stitch.
2. Triple Stretch Stitch .
3, Elastic Overlock Stitch.
4. Elastic Stitch.
5. Blind Stitch.
6. Scallop Sritch.'
A.B.C.D. Automatic Buttonhole.
The stitch lengih is regulated by turning
the stitch lengrh dial.
Numerals beside the dial represent the
stitch length. THE HTGHER THE NUM-
BER, THE LONGEB THE STITCH.
The "0" means that the material is not fed.
The "F" area is used for making a SATIN
STITCH (a close zigzag stitch) and this
stitch is used for making decorative patterns.
is varied according to the material and thread
must observe the feeding of the material.
STITCH
The .zigzag width is regulated by operating
the stitch width dial.
Numerals beside the dial represent the width
'of stitch. THE HIGHER THE NUMBER,
THE WIDER THE STITCH.
The "O" means straight stitch only.
NOTE: 1. Do not move the dial while the
needle is in the material.
2. When using twin needle,'dial
should always be set at under
,. ,,3,'.
To sew in reverse, depress sewing lever in
direction of R-arrow as far as it will allow.
Hold lever in this position until you wish to
sew forward. When lever is released it will
spring back in position and you will sew in
forward direction.
Reverse sewing is used for back-tacking and
reinf orcement.
HEIGHT OF FEED DOG
Aciording to diagram below, regulate height of feed dog by using drop feed button.
The dial position needed to obtain the satin stitch
being used. To determine exact dial position, you
REVERSE SEWING LEVER
Drop feed Height of feed dog Sewing purpose
Down
AA (No feeding)
Button sewing
Darning, Mending,
Embro idering,
Monogramming
Up
,* (Feeding)
General sewing
-6- -7 -

Presser Foot trvrf:eglr -
Your sewing machine is specially constructed for optional twin needle sewing. You can use
either one or two colors of upper thread.
Make sure that the two threads used to
thread twin needle are of the same weight.
, lf thread is not of the same weight, stitching
will be faulty.
INSERTION OF TWIN NEEDLE .
lnsert in same manner as single needle.
Flat.eide of needle should face toward back
and longgroove should face you.
THREADING OF TWIN NEEDLE
Follow instructions for single needle thread-
ing (see page 12]r, but thread each needle
separately. The groove should face you.
' NOTE FOR TWIN NEEDLE SEWING
1. Use ZIGZAG NEEDLE PLATE.
2. Use ZIGZAG PRESSER FOOT.
3. Set stitch width dial at under "3".
I Golden Slretch Stitch Needle
Loosen
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X-€y
X€X
You will find various kinds of presser feet for
special use in the accessory box.
According to your sewing needs, it may be neces-
sary to change presser foot.
TO CHANGE THE PRESSER FOOT
1. Raise needle to its highest position.
2. Raise presser foot.
3. Loosen Presser foot thumb screw and remove
presserfoot.
Place groot'ed side of the new presser foot
against the flat of the presser bar.
Tighten thumb screw.
4.
-5.
HOW TO CHANGE THE NEEDLE
1. Raise needle to its highest position.
2. Loosen needle clamp screw and remove old
needle.
3. lnsert new needl€ up into needle clamp hole as
far as it will go against the needle stop. Make
sure the falt side of the needle faces toward the
back and the l6ng groove toward you.
4. Tighten needle clamp screw securely.
HOW TO CHECK THE NEEDLE
1, The sewing needle must always be straight and
sharp for smooth sewing.
2. To check if needle is bent, place flat side of
' needle down as shown in illustration at left.
Because the popularity of stretch fabrics
STITCH NEEDLE" has been developed.
sewing machine.
With thE ,,GOLDEN STRETCH STITCH
easily.
continues to grow, a special "GOLDEN STRETCH
A package is enclosed in the accessory box of your
NFEDLE" you can sew any type of stretch fabric
You will find that when using the "GOLDEN STRETCH STITCH NEEDLE" you will not
skip stitches and your sewing will be neat and prdfessional even on the mostadvanced stretch
fabrics of today.
Needle stop J/ / ^ Loo""n
-8- -9-

The needle plate which has the wide open-
ing for the needle can be used for both zig-
zag and straight stitch sewings.
However, when you sew an extremely light
material in straight stitch, we recommend
that you use straight stitch needle plate
which has a small hole.
Use straight stitch presser foot when you
changed needle plate to straight stitch
needle plrte,
TO CHANGE NEEDLE PLATE
1. Raise needle to its highest position.
2. Raise presser foot,
3. Draw slide plate out toward you.
4, Fit holes of needle plate to the guide
screws and put on.
I Sew-t-ight
Turn this knob in any direction to switch
lisht on and off . (110/1 15 V AREA)
Push this button to switch light on and off .
Q2OI24O V AREA}
HOW TO CHANGI THE BULB
Loosen
1 . Swing open face plate.
2. Remove bulb by turning counter'
clockwise.
3, Replace bulb and swing face plate to
close-
NCTE: 1 ) Disconnect electric pltig f rom
wall outlet before removing
bulb.
.2) Always use COBRECT SPARE
BULB.
, MAXIMUM INPUT OF LAMP
12 W ..'."..'- 110/1 15 V AREA
15 w ..".."'. 2201240 v AREA
1.
2. Select correct size of needle and thread from above chart
Use the same size thread for upper and lower threads.
SEW.LIGHT SWITCH KNOB (BUTTONI
Straight stitch
needle plate Zigzag stitch
needle plate
SEWING MATERIALS NEEDLE
SIZES THREAD SIZES
VERY THIN Fine tricot, Fine lace,
Thin linen, Silk, Tulte,
Chiffon ICotton:8O-120
Synthetic
Fine Mercerized Cotton
LIGHTWEIGHT Organdy, Jersey, Voile,
Taffeta. Synthetics Sil k,
Bat iste 11 Cotton:60-80
Silk: "A"
Synthetic
Mercerized 50
MEDIUM Cotton, G ingham, Poplin,
Percale, Pique, Satin, Vel-
vet. Lightweight wool,
Fine corduroy, Suitings 14 Cotton:50-60
Silk: "A"
Synthetic
Mercerized 5O-60
HEAVY Denim, Gabardine,
Tweed, Corduroy 16 Cotton:40-50
Mercerized Heavy Dutv
VEFIY HEAVY Canvas, Overcoating,
Upholstery 18 Cotton:30-40
Mercerized Heavy Duty
NOTE:
-10- - 11 -

Upper (Needle) Thread
Before threading, raise presser foot and
take-up lever to the highest position.
Then place spool of thread on the spool pin.
1. Pass threid through the eye of upper
thread guide.
2. Pass tfread between upper thread
tension discs from the upper side of
guide pin.
3. Bring thread down and up through
thread guard from left to right so that
thread picks up the thread check spring.
4. Pass ihread into the eyelet of the thread
take-up lever from left to right.
5. Bring down again and pass thread
through the thread guides.
6. Thread needle from front to back and
draw the thread out about 2 inches
(5 cm).
NOTE:
IF THE THREADING ORDER IS NOT
CORRECT, THREAD BBEAKAGE,
STITCH SKIPPING, WRINKLING OF
FABRIC WILL OCCUR.
Tighten
1. Loosen stop motidn knob by turning it
toward You. 2. Plaie an empty bobbirr on the bobbin
winder Pin.
4. Wind the thread a few times around
' the bobbin clockwise and PUsh the
bobbin toward bobbin presser' Start
the machine gently.
5. Bobbin stops winding when f ull'
6. Push the bobbin to the left and remove
it. Tighten stop motion knob securely'
3. Place thread spool on the spool pin and
take thread through bobbin winder
tension disc.
HOW TO WIND BOBB]N
1. afqFUpperthread
2. At-Guiae pin
Bobbin winder Pin
. r Bobbin
-'t2 -- 13 -

TH READ
HOW TO REMOVE ANO INSERT BOBBIN CASE
HOW TO THREAD BOBBIN CASE
TO REMOVE BOBBIN CASE
1. Raise needle to its highest position.
2. Open the shuttle cover by turning it
down.
3. Pull and open the latch of bobbin case.
4. Pull out bobbin case from the shuttle.
TO INSERT BOBBIN CASE
1. Raise needle to its highest position.
2. Holding bobbin case latch with metal
finger'of case pointing up, fit it into
the notch at the top of shuttle race.
3. Push case back fully making sure the
case is in the proper position and release
the latch.
NOTE:
(A) Four inches (10 cm) o{ thread should
be drawn out and left out of case.
(B) Latch of bobbin case should be open
fully to prevent bobbin coming out of
case.
(C) lf bobbin case is not placed back in
machine properly it will come out
f rom the shuttle immediately af ter
starting to sew.
1 . Raise needle and Presser
foot to the highest Posi'
tion. Wlth left hind, hold
the end of uPPer thread
and with right hand, turn
balance wheel toward You
until the needle moves
down and uP again to
its highest Position.
2. Now upper thread catch-
es the lower. thread in a
looP. Pull thread toward
you so that lower thread
will come uP in a large
loop from the Presser
foot.
3. Pull both threads under
the toes of Presser foot
and Place them to the
rear leavinq about 4
inches {10 cm).
1. Pull trailing thread into
the slot of case. 2. Unwind about 4 inches (10 cm) of thread f rom the
bobbin. lnsert wound
bobbin into bobbin case.
3. Pull thread to the left
under tension spring until
thread enters into delivery
eye.
HOW TO PULL UP LOWER
-14- - 15 -

Thread Tension
It is important that tension of upper and lower threads be equal to prevent puckering of ma-
terial or other problems.
It is recommended that a test sample be made before starting to sew.
UPPER THREAD TENS]ON To regulate thread tension, merely turn
thread tension dial with left thumb after
lowering the presser foot.
THi FIIGHER THE NUMBER. THE
TIGHTER THE TENSION.
To increase tension: Turn dial downward
to large number.
To decrease tension: Turn dial upward to
smaller number.
NOTE: The zigzag stitch requires less upper
thread tension than straight stitch.
LOWER THREAD TENSION Although lower thread tension has already
been adjusied at the factory, when sewing
very thin or heavy material it may have to
be read,usted.
To regulate the lower thread tension,
turn small screw on the tension spring of
the bobbin case with the small screw driver.
To increase tension: Turn the small screw
clockwise very slight-
ly.
To decrease tension: Turn the screw coun-
ter-clockwase very
sl ightlY.
INCORRECT STITCH. (B'
___-1lr
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Tension of upper and lower threads should
be equal, just sufficiently strong to lock
both threads in material.
Perfect stitching appears flat with no
puckering of material-
The upper thread lies on the surface of
the material by pulling the lower thread
up as shown.
This is caused by tight tension on the upper
thread or loose tension on the lower thread-
To correct this, turn the upper thread
tension {ial to a lower number.
When perfect stitch cannot be obtained by
only upper thread tension dial, adjust the
bobbin tension accordingly.
The lower thread lies on the under surface
of the material by pulling upper thread
down as shown.
This is caused by loose tension on the upper
thread or tight tension on_ the lower thread.
To correct this, turn the upper thread
tension dial to a higher number.
lf perfect stitching cannot be obtained by
changing upper thread tension, adjust the
bobbin tension.
NOTE: lt is recommended tha, test samples are marle before starting to sew.
PEBFECT STITCHING
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-16- - 17 -