Seiko SK-6 User manual

OPERATING
INSTRUCTIONS
MODELS
S^^-6/W-6F
SKM-26
SEIKO
SEWING
MACHINE
CO.,
LTD
TOKYO,
JAPAN
From the library of: Superior Sewing Machine & Supply LLC

SPEED:
ROTARY
HOOK:
BOBBIN:
NEEDLE:
NUMBER
OF
NEEDLE
THREAD:
FEED
MECHANISM:
.
STITCH
LENGTH
:
PRESSER
BAR
LIFT:
PRESSER
FOOT:
WORKING
SPACE:;.v
.
-vi:-
SPECIFICATIONS
SK-6,
SK-6P
1,200
r.p.m.
#32
34.50x15.6
mm
DDxl #
18-29
J
: One •/
Synthetic
#5-#
00
Drop
feed
1
(SK~6)^
•
Drop
feed
Drop
&
upper
feedv,
(SK—6P)
Maximum
13
mm
Maximum
13
mm
Flat
presser foot i
254mmX195mm.:
SKM-26 \
800
r.p.m.
• ; /
•
#32S
••••
[
34.50X15.6
mm
:•
i
^
DDxl
#18-29 '
V
Two
Synthetic
#2-#00
'
Maximum
8 mm
VV
Maximum
10
mm
-
Flat
presser foot & . :
roller presser foot
254
mm
X195
mm
"f^
• I :
!
..
From the library of: Superior Sewing Machine & Supply LLC

CONTENTS
Page
Setting Up the machine 2
Speed
of the machine 3
Oiling 4
Needle
and
thread
5^
g
Winding bobbins g
Inserting and removing the bobbin case and bobbin 7
Threading the machine 8
Preparing for sewing 9
Regulating the thread tension (SK only) 9
Regulating the thread tension (SKM only) 10
Adjusting the presser foot pressure 10
Adjusting the stitch length 10
Bulge guide of sewing material
(SKM
only) 10
Gauge parts (SKM only) H
One or three needle machine (SKM only) 11
Piping or beading
work
(SKM
only) 11
Dummy-joint finish with, knife
(SKM
only) 11
Two
roller presser feet (SKM only) 11
Adjusting the clearance between
needle
and hook (SK only) 12
Timing
between
the
hook and needle 12
Adjusting
the
height of
the
needle
bar
; 13
Adjusting
the
hook
retainer
bracket
14
Adjusting
the
height
of
the
feeder 14
Adjusting the feed bar hinged stud 14
Timing
between
needle
and
feeder
15
Adjusting
the
lift
of
presser
foot
and
upper
feeder
(SK-6P
only)
15
Adjusting
the
height
of
the
presser
foot
(SKM,
SK—6
only)
16
Adjusting the thread controller spring 16
Model
SK—6P
- 1 —
From the library of: Superior Sewing Machine & Supply LLC

ase
and
ma
ig material.
A
Fig. 2 To Install the
machine
on the table
Fig. 3 &
4'
To assemble the pedal
From the library of: Superior Sewing Machine & Supply LLC

ii'
s.
ti.'v30''~40
Fig. 5 The
proper
angle of the
pedal
i
Fig. 6 To ossemble the knee lifter (SKM-26 only)
SPEED
OF
THE
MACHINE
The
maximum
speed
for
machines
of class
SK
is 1,200
stitches
and
SKM-26
800
stitches
per
minute.
Machines
should be
run
slower
than
the
maximum
speed, until the parts which are in movable contact have become galzed by
their
action upon each
other.
From the library of: Superior Sewing Machine & Supply LLC

OILING
-
Do
not
operate
the
machine,
even
if
only
for
testing,
unless
it
has
been
properly oiled at every spot requiring lubrication.
The arrows on the
figures
7, 8, 9, 10 and
11
indicate
these
spots.
Oiling
must
be
done
at
least
twice
daily
when
the
machine
is
in
continuous
operation
to
assure
free
running
and
durability
of the
operating
parts.
ir I
i
r
V.
...
mESp
n
lol
®!5
From the library of: Superior Sewing Machine & Supply LLC

Fig. 11
NEEDLE
(SK Fig. 12, SKM-26 Fig.
13)
The
machine is set up to
use^DDxl
in size ranging from 18 to 29.
The
thickness of the sewing thread, which must pass freely through the
needle eye, determines
the
size of the needle.
To
insert the needle, turn the machine pulley toward you, until
the
needle
bar rise to its highest point, loosen
the
needle set screw (2) and put the needle
up into the needle bar as far as it will go, with the long groove of the needle
toward the left (SK), or toward you (SKM).
Then,
tighten the needle set
screw
securely.
From the library of: Superior Sewing Machine & Supply LLC

THREAD
twist
thread
is
to
be
used
for
needle,
to test for twist, hold a length
/ \ ^
of
thread
between
thumbs
and
index
J
\^
fingers
of
your
hands.
Turn
the
thread
counterclockwise.
F'g*
If it will twist tighter, it has a left twist.
If it unravels, it has a right twist.
The
bobbin can be wound with either left or right twist thread.
WINDING BOBBINS (Figs. 2 and 15)
The
bobbin winder is mounted on the table top with its pulley (5, Fig. 2)
in front of the driving belt so that the
pulley
will separate from the belt after
the bobbin has been wound with suflicieiit thread, push the bobbin on the
bobbin spindle (3 Fig. 15) as far as it will go.
Pass the thread from the thread stand downward through the eye (1, Fig. 15)
in
the
tension
bracket.
Then,
between
and
around the back of the tension discs (2
Fig.
15) hring
the
thread
forward
toward
the
bobbin
and
wind
from
below
in
clockwise
direc
tion several times around the bobbin. Push bobbin winder lever (4, Fig. 15)
downward until the wheel (5) contacts the drive belt and
start
the machine.
After
the bobbin is filled with thread, release will cause the wheel to disen
gage from the belt and winding will stop. Cut the thread and remove the
bobbin from the winder spindle.
The
adjusting screw (A, Fig. 15) can be turned in or out to increase or
decrease
the
amount
of
the
thread
wound
on
the
bobbin.
If
the
thread does not wind evenly on bobbins, loosen
the
screw (B, Fig. 15)
and move the bracket to the right or left as may berequired and tighten the screw.
Fig. 15
— 6 —
From the library of: Superior Sewing Machine & Supply LLC

INSERTING
AND
REMOVING
THE
BOBBIN
CASE
AND
BOBBIN
Turn
the balance wheel until the needle is above the needle plate.
Push the
retainer
(1, Fig. 16) to
the
left
like the figure 16, and remove the
bobbin case (2,
Fig.
16).
Pull up the latch (1, Fig. 17) and lift
the
bobbin from the bobbin case.
To
insert a full bobbin, raise
the
latch
in center of the bobbin case, and
place the bobbin on the center post of the bobbin case.
Be sure
that
the
thread
draws
out
from
tho
bobbin from left to
right.
Pull the thread into the
cut
(4,
Fig.
18) in
the
edge of
the
bobbin case, and
from you under the tension spring (5, Fig. 18). Then, pass its end from
the
back through the hole (6, Fig. 18) in
the
bobbin case.
Finally, push down the latch to retain the bobbin in position.
From the library of: Superior Sewing Machine & Supply LLC

• 1
Fig. 20
THREADING
THE
MACHINE
(SK
only)
B 1
\vWk
Raise
the
needle
bar
to
its
highest
1
the
thread into the hole (1)
JB
j
and
into
the
thread
guide
(2)
and
from
-^5
HBj
above
bet^veen
the
retaining
discs
(3),
«•
B
down
from
the
right,
under
and
be-
S'i
B '
Bi
tween
the
tension
disc
(4),
over
the
;
six
^
Vyy'SE-
-^B
spring
(5),
under
the
slack
thread
reg-
"Jspi '
ulator
(6),
up
through
the
guard
(7),
from right to left through the hole in
^PiSwwBfW
M
iiii.i
the
take
up
lever
(8),
down
through
Fig.
21
the thread guide (9), through
the
needle
bar thread guide (10), then from left to
right through the eye of the needle, leaving an end of the thread about 10cm long.
Fig.
21
,
THREADING
THE
MACHINE
J(
^8
(SKM
only)
^1^3
Raise
the
needle
bar
to
its
highest
||
above
between
the
retaining
discs
(3),
and
from
right
to left
around
the
ten-
,2 discs (4), over
the
spring (5), un-
I
JiS^\
5 n
'KB
der
the
slack
thread
regulator
(6),
up
\g
*
through
the
guard
(7),
from
right
to
r^[i
j.
,1
left
through
the
hole
in
the
take
up
lever (8),
down
through
the
thread
Fig.
22
through
the
needle clamp hole (11),
then through
the
eye of
the
needle
you, leaving the end of the thread about 10 cm long.
From the library of: Superior Sewing Machine & Supply LLC

PREPARING
FOR
SEWING
With
the
left
hand
hold
the
end
of
the
needle thread, leaving it quite
slack
from
the
end
to
the
needle.
Turn
the hand pulley toward you
until
the
needle
moves
down
and
up
again to its highest position, thus
catching the under thread.
Then,
pull the end of the needle
thread you are holding, then the
bobbin tliread will be
brought
up
with it through the needle hole in
the
needle plate.
mf
Fig. 23
TENSION
OF
THE
BOBBIN THREAD (Fig. 18)
If it is necessary to
alter
the
tension
on
the
bobbin
thread, slightly turn the screw
(7) to
the
right
to increase it
or
turn
the
screw
to
the
left
to
decrease
it.
~ Perfect stitching.
- Tight tension of needle
thread.
Loose
tension
of
needle
thread.
REGULATING
THE
THREAD
TENSIONS (SK only)
For ordinary stitching, the tension of the
upper and lower threads should be equal so
that
both
threads
are
in
the
center
of
the
goods.
If
the
tension on
either
thread
is
stronger
than on the other, imperfect stitching will
be
the
result.
A
correct
stitch
can
be usually
obtained
by adjusting the tension on the needle thread.
To
increase the tension,
turn
the thumb
nut
(1) to
the
right,
or to decrease
it,
turn
it
to
the
left.
If
the
thread is found to slip in the tension
discs
without
turning
them,
slightly increase
the
tension of
the
retaining discs by
turning
the,thumb
nut (3) to the right and decrease
the
pressure against
the
tension discs by turn
ing slightly the thumb
nut
(1) to the left.
— 9 —
Fig. 24
Fig. 25
From the library of: Superior Sewing Machine & Supply LLC

Fig. 26
Fig.
27
7*
REGULATING
THE
THREAD
TENSION
(SKM
only)
The
thread tensions of upper thread
(a) and lower thread (b) should be
equal
k
1.
Correct
tension
2. Tight tension of needle thread
3. Tight tension of bobbin thread
ADJUSTING THE TENSION OF THE
UPPER
THREAD
The
serrated nut (6) controls the tension of two
upper threads. To increase the tension, turn the
nut to right, or to left to decrease it.
ADJUSTING
THE
TENSION OF
THE
LOWER
THREAD
See
the
instructions
for
SK
machines.
ADJUSTING THE
PRESSER
FOOT
PRESSURE
(Fig. 7)
The
pressure of
the
presser foot is regulated by the screw (1).
To
increase the pressure, turn it to the right and to the left to decrease the pressure.
ADJUSTING THE STITCH
LENGTH
(Fig. 7)
Turn
the
balance wheel toward you, at
the
same time pressing on
the
feed
regulating
lever
(2)
until
it snaps
into
the
feed
driving
mechanism.
Continue
the
pressure on
the
lever and
turn
the
balance wheel
either
to or
from
you until the travel of the feed is such as to give the required length of stitch.
BBmmm
11,111
|||i||||iii|||i||ii^
'
V;
the
bulge
GUIDE
OF
^^^81
^
SEWING
MATERIAL
IS
Normally,
edge of
the
guide
(1)
comes
to
the
center
of
the
needle
plate.
To
adjust this, loosen
the
set
screw
(2)
and
move
the
guide
to
ward
the
arrow
direction.
The
shape of
the
guide
can
be
varied according to the sewing
purpose.
—
10
—
From the library of: Superior Sewing Machine & Supply LLC

GAUGE
PARTS
(SKM
only)
There are three kinds of gauge parts (needle clamps) as 3.5 mm 4.8 mm and
7.5 mm, according to your purpore, replace it to the required size.
ONE
OR
THREE
NEEDLE
MACHINE (SKM only)
One needle machine is used for decorative coarse
straight
stitching.
On three needle machine, either
the
right
or
left side (two needles) make
moccasin stitch and the other needle makes decorative coarse stitching.
Three
needle
machine
can also be used
for
only
the
decorative
coarse
stitching.
These stitcliings can be made by replacing
the
respective presser foot, needle
clamp, needle plate,
and
feeder.
PIPING
OR
BEADING
WORK
(SKM only)
Apiping work requires a special needle plate
having
a hole
through
which a coad is comming
out
for
the
work.
Fig. 31
DUMMY-JOINT
FINISH
WITH
KNIFE
(SKM only)
A
knife
fitted on the presser foot makes dummj'-joint finish on
the
shoe up
pers.
For
this work, knife and special presser foot with groove are required.
: I
roller
PRESSERS
(SKM
only)
roller pressers employing ball bearings
allow
the
curve
stitching
successfully.
t!
From the library of: Superior Sewing Machine & Supply LLC

ADJUSTING
THE CLEARANCE BETWEEN NEEDLE
AND
HOOK
(SK
only)
After
adjusting
the
center
of the needle to
the
hook point, adjust the liook
position so
that
the
clearance
between
the
needle
and
hook
becomes 0.1 to
0.2
mm,
when
the
hook point comes to 3.5 mm
from
the
upper end of the needle
eye.
Then,
tighten
three
screws (2).
I
|||,„
III
I
bushing
(3)
to
fit
snugly
bottom
of
the
hook
like
the
'Pq loosen the screw (4), at first
remove
the
bobbin
case
retainer
mil
ratchet (1,
Fig.
39).
Fig.
33
THE
TIMING
BETWEEN
HOOK AND
NEEDLE
(SK
only)
Loosen the hook set screws (2, Fig. 33), turn the hand pulley toward you
until
the
needle
bar
raises
to
3.8
mm
-from its lowest point.
—
-—
The
dimension
between
the
two
basic
lines (1) and (2) is 3.8
mm,
use it as a
standard.
I
Bring
the hook point (2,
Fig.
35) to
1-
^ L
tbe
center
of
the
needle
(1,
Fig.
35)
^ L
3.8mm
by
moving
the
hook
and
tighten
three
T
screws
(2,
Fig.
33).
Be
sure
that
there
is
no
clearance
be
tween
the
surface of
the
hook driving
C—shaft
bushing
and
the
hook
but
they
Fig.
34
move
smoothly.
THE
TIMING
BETWEEN
HOOK
AND
NEEDLE
(SKM
only)
.
Loosen
the hook set screws, turn the
balance
wheel
toward you until the
needle bar raises to 3.8 mm from its lowest position.
Bring
the
hook
point
(1, Fig.
36)
to the center
between
two
needles
(2)
and
(3),
then tighten the
hOok
screws,
at the
same
time,
set the
clearance
between
the needle and hook point
0.1mm
to 0.2 mm.
—
12
—
From the library of: Superior Sewing Machine & Supply LLC

ADJUSTING THE HEIGHT OF THE
NEEDLE
BAR
(SK only)
This
should be made
after
the
timing
between the needle
and
hoolc has been
determined.
Turn
the
balance wheel
toward
you so as to fit
the
center
of the
needle to the hook point (refer to Fig. 35).
Loosen
two
screws (1, Fig. 37), adjust the needle
2
down
so that the
upper
endof the
needle
] /
eye
comes
to
down
3.5
mm
from
the
hook
point,
asmrn-j-
^ Then, tighten the screws.
'
/"•
||
\ .
When
the
needle
bar
is
at
its
lowest
position,
/
\I|;3.8mm
adjust
the
needle
bar
bushing
up
and
down
so
as
I \
to
fit
the
bottom
of
the
,needle
bar
bushing
(3,
\ 1 Fig.
34)
and the
basic
line
(1, Fig.
34).
Further,
\ • y
turn
the
hand
pulley
toward
you,
confirm
whether
N.
the hook point comes to the center of the needle
•'
or not when the bottom of the needle bar bush-
Fig.
35
ing
fits
to the
basic
line
(2,
Fig.
24).
Ftg.
36
Fig. 38
Fig. 37
ADJUSTING THE HEIGHT OF THE
NEEDLE BAR (SKM only)
This
should be made
after
the timing between the
needle
and
hook
has
been
determined.
Turn
the balance wheel toward you so as to fit
the
center
of
the
left
needle to
the
hook point.
Loosen the screws (1, Fig.
.38),
adjust the needle
bar up or down so that the upper end of the
needle
eye comes to 3.5 mm down from the hook point,
at the same time, the two needles must be parallel.
Then,
tighten the screw (1, Fig. 38).
—
13
From the library of: Superior Sewing Machine & Supply LLC

ASSEMBLING
THE
HOOK
RETAINER
BRACKET
Fig.
39
This
must be done
after
adjusting
the
clearance
between
the
needle
and
hook.
Let
the retaining
spring
(2) contact
sufficiently, but not to bend,
with
the
hook (3) without
any
clearance, theri
tighten
the
screw (4) securely.
Excess
contact
between
the
two
makes
unnecessary
wear
and
noise.
ADJUSTING
THE
HEIGHT
OF
THE
FEEDER
Adjust
the
feed
motion
to
the
maximum
and
turn
the
balance
wheel
to
raise
the
feed dog to its highest position.
^Loose^
the^
screws
Fig.
40
Fig. 41
ADIUSTING
THE
FEED
BAR
HINGED
STUD
Fig.
42
When
the
feed dog is at its highest position, if it
is not parallel with the surface of
the
needle plate,
loosen
the
stud
screws (1)
and
turn
the
stud
(2) to
get
its parallel, then tighten
the
screws.
14
—
From the library of: Superior Sewing Machine & Supply LLC

TIMING
BETWEEN
NEEDLE
AND
FEEDER
The correct timing is as follows:
Adjust
the
feeding
motion
to
the
maximum
and
turn
the
balance
wheel
to
ward
you,
after
the
feed
dog
has
finished
its
feeding
motion
and
when
teeth
of
the
feeder
become
equal
height to the
surface
of the
needle
plate,
the
needle
reaches to the needle plate.
To
adjust
this,
pull
open
the
top
cover
(1),
loosen
three
screws
(3)
out
of
five
oil
the
feed
eccentric
adjusting
flange
coupling
(2)
and
move
the
feed
ec
centric adjusting
flange
(4) for the adjustment.
v.
V U-, M» y
VJ"
Fig. 43 Fig. 44
ADJUSTING
THE
UP
AND
DOWN
TRAVEL
OF
THE
FEEDER
(SK-6F,.SKM
only)
The
adjustment
of
the
up
and
down
travel
of
the
feeder
against
its
back
and
forth travel is made so that the teeth of the feeder rise to the highest point
at the
middle
position,
when
feeding
travel
is
the largest.
Loosen
two
screws
(5)
and
adjust
it
against
the
main
shaft
by
moving
the
feed lifting
cam
(6).
To
make
its
up
and
down
travel
faster,
turn
the
feed
lifting
cam
toward
driving
direction
and
to
make
it
slower,
turn
the
cam
toward
opposite
direction.
Be
sure
to
tighten
screw
pushing
the
screw
against
the
rod
(7)
not
to
make
any clearance axialy.
ADJUSTING
THE
LIFT
OF
THE
PRESSER
FOOT AND
UPPER
FEED
DOG
The thickness of the material sewn should control the height of the lift of
the presser foot and upper feed dog.
It
should
normally
be
just
high
enough
for
clearance
of the material.
Push
the
presser
bar
lifter
(i)'up,
loosen
the
screw
(2),
fit
the
needle
hole
of
the
presser
foot
(3)
to
the
needle
and
adjust
the
measure
13
mm
between
the
upper
surface
of
the
needle
plate
(4)
and
the
bottom
of
the
presser
foot
(3), then tighten the screw (2).
—
15
-
From the library of: Superior Sewing Machine & Supply LLC

S M
m
.h
Fig.
45
Lower
the
presser
bar
lifter
and
so adjust
the
both
lift to be always equal height by lossing
the
screw
(6) and moving the upper feeder (5) up and down,
when
turning
the
balance wheel.
When
raising
the
lift of the upper feed dog,
move
the
position of the lifting presser .bar bell
crank
driving
cam
shaft
(7)
and
the bell
crank
(8)
raise
the
position of
the
presser foot (5) by
the
knock pin.
Then
the
lift
of
the
presser foot (3)
must
be ad
justed according to
the
lift of
the
upper feeder (5).
ADJUSTING
THE
HEIGHT
OF
THE
PRESSER
FOOT
(SKM,
SK-6
only)
Raise the presser bar lifter (1) and so adjust the
(SKM-26)
I
between
the
bottom
of
the
presser
foot
(2)
and
the
I'-
•
adjust
this,
loosen
the
screw
(4),
fit
the
needle
h• I
gCSr
^
presser
foot
to
the
needle
by
moving
the_
I
fMY
f
presser
bar
(5)
up
or
down,
then
tighten
the
screw.
Fig.
46
ADJUSTING
THE
THREAD
CONTROLLER
SPRING
(SK,
Fig.
25,
SKM
Fig. 27)
Normally, the thread controller spring (4) should hold slack of the .upper
thread until the needle reaches to the goods, and it should pause.
To
adjust this, loosen the screw (5) and adjust it by turning the thread take
up
spring
regulator
(6).
To
strengthen the tension of the controller spring, loosen slightly the tension
screw stud (7) with a screw driver and turn the serrated nut to the right, to
lighten the tension, turn to the left. Then, tighten the tension screw stud.
—
16
—
From the library of: Superior Sewing Machine & Supply LLC

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Printed in Japai
From the library of: Superior Sewing Machine & Supply LLC
This manual suits for next models
2
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