Consew 206RBL-18 Parts list manual

________ .... S/nc81'8.98
DNSEW,
CONSOLIDATED SEWING MACHINE CORP.
L INDUSTRIAL SEWING & CUTIING EQUIPMENT
Model
206RBL-18
Operating Instructions
&
Parts Book

CONTENTS
1. MAIN PARTS NAMES .........................................................· ..... ·.· .... ·..............................................................1
2. SPECIFICATIONS ............................................................................................................................................1
3. WORK TABLE AND MOTOR .........................................................................................................................2
4. INSTALLATION ................................................................................................................................................3
4·1. Installing the rubber hinge and the corner rubber ................................................................................... 3
4·2. Installing the oil pan .................................................................................................................................... 3
4·3. Installing the machine head ....................................................................................................................... 3
4-4. Installing the spool pin ................................................................................................................................ 4
4-5. Installing the knee lifter assembly ............................................................................................................. 4
4·6. Installing the belt......................................................................................................................................... 5
4·7. Installing the bobbin winder....................................................................................................................... 5
4·8. Installing the belt guard {L) ......................................................................................................................... 6
4·9. Installing the thread stand .......................................................................................................................... 6
4·10. Lubrication ....................................................................................................................................................7
4-11. Checking the machine pulley rotating direction ....................................................................................... 8
5. PREPARATION BEFORE SEWING ................................................................................................................9
5-1. Installing the needle .................................................................................................................................... 9
5·2. Removing the bobbin case ......................................................................................................................... 9
5·3. Winding the lowerthread ......................................................................................................................... 10
5·4. Installing the bobbin case ......................................................................................................................... 10
5·5. Threading the upper thread...................................................................................................................... 11
5·6. Adjusting the stitch length........................................................................................................................ 11
6. SEWING ........................................................................................................................................................... 12
6·1. Sewing ....................................................................................................................................................... 12
6·2. Backtacking ...............................................................................................................;................................ 12
7. THREAD TENSION......................................................................................................................................... 13
7·1. Adjusting the thread tension .................................................................................................................... 13
7·2. Adjusting the presser foot pressure ........................................................................................................ 13
8. STANDARD ADJUSTMENTS ...................................................................................................................... 14
8·1. Adjusting the thread controller spring..................................................................................................... 14
8·2. Adjusting the height ofthe feed dog ....................................................................................................... 15
8·3. Adjusting the feed dog posi~ion (longitudinal) ....................................................................................... 15
8-4. Adjusting the positions of the needle and needle hole of the feed dog ............................................... 16
8-5. Adjusting the timing the needle with feed ..................,........................................................................... 17
8·6. Adjusting the height ofthe needle bar .................................................................................................... 17
B·7. Adjusting the timing between the needle and hook............................................................................... 18
8·8. Adjusting the clearance between rotary hook and opener (thread release finger) .............................. 19
8·9. Adjusting the clearance between feed forked connection and feed fork coliar.................................... 20
8·10. Adjusting the height ofthe presser feet .................................................................................................. 20
8·11. Adjusting the presser foot movement amount ....................................................................................... 21
8-12. Adjusting the timing of the vibrating presser foot ................................................................................. 22
8-13. Adjusting the feed regulator .................................................................................................................... 23
9. SAFETY CLUTCH MECHANISM ................................................................................................................. 24

1. MAIN PARTS NAMES
2. SPECIFICATIONS
1. MAIN PARTS NAMES
Needle bar-~_
Finger guard-~~
Vibrating
presser foot
--
'--- Lifting presser
foot
'---~ Feed dog
Feed regulating dial
'--- Bobbin winder
Safety clutch mechanism
<Rear of machine>

3. WORK TABLE AND MOTOR
.. Work Table
• When using a table made by another manufacturer, drill holes in the table as shown in the figure below.
• The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and
withstand the vibration of the sewing machine.
Work table processing diagram
-IK-I-"
Head rest hole
Motor mounting holes
026 Sea! depth 1
Knee lifter installation
position 81
~'or.;: l
Thread sland hille
51%0.3
+
+
+
>:::'f-t---T---+-+---l-+--T-----f',=t
4-2511 ~ .
JC===================t====~====±=~~±===============~-~ ~
~~~-------------------------7~1200----------------------------,1
A-A cross section B-B cross section
Oil pan installation pos~ion
15.5mm
.. Motor
ACAUTION
w8
40
All cords which are connected to the motor
should be secured at least 25 mm away from
any moving parts. Furthermore, do not ex-
cessively bend the cords or secure them too
firmly with
staples, otherwise there is the
danger that fire or electric shocks could oc-
cur.
O·Install
the correct belt guard which corre-
sponds to the motor being used.
<Motor>
• Select the correct motorfrom those listed in the table.
• Refer to the instruction manual for the motor for de-
tails on installing and using the motor.
<Motor pulley and V-belt>
• Select the correct motor pulley and V·belt
by referring to the table to suit the power
frequency of your area.
Sewing speed
2,000 spm
Power Motor
Single-phase 110V 2pole, 400W motor
Three-phase 220V 2pole, 400W motor
Frequency Motor pulley V-belt
50
Hz Motor pulley 55 41 inches
60 Hz Molor pulley 45 41 inches

4. INSTALLATION A CAUTION
1\:\. The sewing machine should only be in-
\..y stalled by a qualified technician.
O.Ask your
SEIKO dealer or a qualified elec·
trician for any electrical work that may need
to be done.
O.The sewing machine weights more than
29
kg. The installation should becarried out by
two or more people.
1\:\ • Do not connect the power cord until instal-
\y lation is complete, otherwise the machine
will operate if the treadle is pressed by mis-
take, which could result in injury_
A • Be sure to connect the ground. If the ground
~ connection is not secure, serious electric
shocks
will result.
o·Install the belt guard to the machine head.
4-1. Installing the rubber hinge and the corner rubber
4-2. Installing the oil pan
4-3. Installing
the machine head
1. Install the rubber hinge 0 on the table with nails
f).(Two places)
2. Install the
corner rubber e at the four corners of
the table with nails O.
Flt oil pan 0 into the opening in the table, and
secure it with 4 nails f).
(Refer to the work table processing diagram on
page
2.)
1. Insert the two bed hinge connections 0 into the
holes in the machine bed.
2. Fit the bed hinge connection 0 to the rubber hinge
f) and then place the machine head onto the cor·
ner rUbber e.
3. Tap the head rest 0 into the table hole.
NOTE: Tap the head rest securely into the table
hole.
If the head rest is not pushed in as
far as
it will go, the machine head will not
be sufficiently stable when it is tilted back.

4-4. Installing the spool pin
4-5. Installing
the knee lifter assembly
Insert the spool pin 0 into the installation hole, and
screw it in tightly.
1. Assemble the knee Jifter aSSembly 0 as shown in
the illustration.
NOTE: Make sure that the knee lifter stopper f)
is facing in the correct direction.
2. Install the knee lifter assembly 0 on the back of
the table with 4 screws &. (Refer to the worktable
processing
diagram on page 2.l
3. Adjust
the knee lifter.
1) Lower the presserfoot e by using the presser
bar lifter 0.
2) Loosen bolts 0, f) and O.
3) Adjust the position of the thrusting bar com-
plete cr!> so that the clearance between its
curvedsection
and the very bottom ofthe roller
CD is approximately 2 mm when the knee pad
ois at the stop position.
4) Securely tighten bolts 0, f) and O.
5) Press the knee pad 0 to raise the presser foot
e by 14 mm; then move the knee lifter stop-
per f) in the direction of the arrow so that it is
against the installation bracket projection @,
securely tighten the bolt ®.

4. INSTALLATION
4-6. Installing the belt
15-20mm
4-7. Installing the bobbin winder
1. Remove the screw 0 and remove the belt guard
'upper cover
8.
2. Tilt back the machine head, and then place the belt
oonto the motor pulley and the machine pulley.
3. Turn the nut 0 to adjust so thatthere is 15·20 mm
of deflection in the belt €) when it is pressed with
a finger with a force of 9.8 N
(1 kgf).
4. Insert the belt guard upper cover 8 into the belt
guard 0 from above the pulley,
and then tighten
it with the screw O.
1. Push down the bobbin set lever 0 as far as it will
go.
2. Place the bobbin winder pulley 8 so that it pushes
the belt0 by approximately 5 mm, and then place
the bobbin winder0
sO that it is parallel with the
belt no Ie in the work table.
3. Install the bobbin winder 0 to the work table with
the two screws
0.
4. Pull the bobbin set lever 0 back and check that
there is approximately 5 mm ofclearance between
the bobbin winder pulley 8
and the belt 0.

4-8. Installing the belt guard (ll
4-9. Installing the thread stand
1. Tilt back the machine head. and then remove the
V-belt from the motor pulley.
2. While tilting the machineforward. insert beltguard
(l) 0 into the belt guard fJfrom underneath, and
let
it rest there.
3. Place the V-belt back onto the pulley.
4. Install belt guard (L) 0 with the two screws 0 so
that there is no clearance between the belt guard
fJ and belt guard (L) 0 (position 0), and so that
the reverse lever e and the belt guard fJ are not
touching (positions ® and @).
Assemble the thread stand as shown in the illustra-
tion, and then install it to the work table.
* Securelytighten the nut 0 so thatthethread stand
does not move.

4-10. Lubrication .
ACAUTION
Do not connect the power cord until lubrication has been completed. otherwise the machine may
operate
if the treadle is pressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when handling the lubricating oil. so that no oil gets
into
your eyes or onto your skin, otherwise inflammation can result.
Furthermore. do not drink the oil under any circumstances. as
it can cause vomiting and diarrhoea.
Keep the oil out of the reach of children.
• The sewing machine should always be lubricated
and the oil supply replenished before it is used for the
first time,
and also after long periods ofnon-use.
• Use only the lubricating oil.
• Add 1·2 drops of oil in the places indicated by the arrows.
Add oil to other sliding parts also. while being careful to avoid oil leaks.
• Oiling must
be done at least twice daily in continuous use.
•
(JJ J..L-J-'V//
1
=
~t 1"·
',\
0 0 @
Dr ~:clc ~
@
Ill- 01
• )." 6)
~
! tf
J J 1/ P
\.:
i""
10..0 •
('
"= "
.-
t . .
'dC! Cf=i~
/ .
~
.
0
\J~
a
~
~

• For oiling to hook
Remove the oil plug 0 and pour oil until the oil surface reaches to the red line of the oil indicator 8. After
pouring oil, tighten the oil plug 0 securely.
• Oiling adjustment to hook
Loosen the nut g. adjust oiling by adjusting screwO.To increase oil flow, loosen the adjusting screw 0, to
decrease oil flow, tighten the screw
O. After oiling adjustments completed,tighten the nut 9 securely.
4-11. Checking the machine pulley rotating direction
A CAUTION
A • Do not touch any of the moving parts or place any objects against the machine while sewing. as
~ this may result in personal injury or damage to the machine. .
1. Insert the powercord plug into the wall outlet, and
then turn on the
power switch.
2. Depress the treadle and check that th.e direction
of rotation of
the machine pulley matches the di-
rection of the arrow O.
• If the direction of rotation is reversed, change the
direction of rotation to the correct direction while
referring to the instruction manual for the motor.

5. PREPARATION BEFORE SEWING
5-1. Installing the needle
A CAUTION
A • Turn off the power switch before installing the needle. The motor will keep turning even after the
f..:t:),. power is switched off as a result of the motor's inertia. Wait until the motor stops fully before
starting work. The machine
may operate if the treadle is pressed by mistake, which could result in
injury.
long groove --.;
5-2. Removing the bobbin case
1. Turn the machine pulley toward you to move the
needle bar to its highest position.
2. Loosen the screw
O.
3. Holding the needle e with its long groove facing
left, insert all the way into the needle bar.
4. Tighten the screw O.
A CAUTION
A • Turn off the powersupply before removing the bobbin case. The motor will keep turning even after
ill the power is switched off as a result of the motor's inertia. Wait until the motor stops fully before
starting work. The machine may operate
if the treadle is pressed by mistake, which could resultin
injury.
...- ..
., CDo
.......
1. Open the bed slide.
2. Pull the latch 0 of the bobbin case upward and
then remove the bobbin case.
3. The bobbin e will come out when the latch 0 is
released.

5·3. Winding the lower thread
A CAUTION
A .... , · Do not touch any of the moving parts or place any objects against the machine while winding the
lower thread, as this may result
in personal injury or damage to the machine.
...
.....
~
~
I I
M
•
~
X 0 X
Jfi
I(/!
1. Turn on the
power switch.
2.
Place the bobbin 0 onto the bobbin winder shaft
0 .
3. Wind the thread several times around the bobbin
o in the direction indicated by the arrow.
4. Push down the bobbin set lever e.
5. Raise the presser foot with the presser bar lifter.
6.
Depress the treadle. Lower thread winding will
then start.
7. Once winding of the lower thread is completed,
the bobbin set lever ewill return automatically.
• If the thread cannot be wound on evenly, loosen
the screw e and move the bobbin winder bracket
o to the side where there is less thread.
* Turn the adjustment screw (\) to adjust the bob·
bin winding amount .
• To increase the winding amount: Tighten the
screw .
• To decrease the winding amount: Loosen the
screw.
Thread winding amount Note:
5·4. Installing the bobbin case
The amount of thread wound onto the
bobbin should be a maximum of 80% of
the bobbin capacity.
A CAUTION
A • Turn off the power supply before installing the bobbin case. The motor will keep turning even after the
L.:t:). power is switched off as a result of the motor's inertia. Wait until the motor stopsfully before starting
work. The machine may operate
if the treadle is pressed by mistake. which could result in injury.
1. While holding the bobbin so thatthe thread winds
to
the right. insertthe bobbin into the bobbin case.
2. Pass the thread through the slot0 and under the
tension spring
0.
3. Pull the thread out through the hole in the end of
the tension spring 0.
4. Check that the bobbin turns clockwise when the
thread is pulled.
5. Hold the latch 9 on the bobbin case and insert
the bobbin case into the rotary hook.
6. Close the bed slide.
\

5-5. Threading the upper thread
A CAUTION
A • Turn off the power switch before threading the upper thread. The motor will keep turning even
Lh after the power is switched off as a result of the motor's inertia. Wait until the motor stops fully
before starting work. The machine
may operate if the treadle is pressed by mistake, which could
result
in injury.
5-6. Adjusting the stitch length
Turn the machine pulley and raise the thread take up
lever 0 before threading the upper thread. This will
make threading easier and it will prevent the thread
from coming out at the sewing start.
Stitch length can be set by turning the feed regulat-
ing dial O.
Numeric figures on the dial 0 show the stitch length
in
mm. The desired numeric figure on the dial 0
should be set at just above, while depressing the
revers lever 8 slightly.

6. SEWING
ita. CAUTION
A....• Attach all safety devices before using the sewing machine. If the machine is used without these
devices attached, injury may result.
A • Turn off the power switch at the following times. The motor will keep turning even after the power
L:!e1 is switched off as a result of the motor's inertia. Wait until the motor stops fully before starting
work. The machine may operate
if the treadle is pressed by mistake, which could result in injury.
• When threading the needle
• When replacing the needle and bobbin
• When not using the machine and when leaving the machine unattended
A • Do not touch any of the moving parts or place any objects against the machine while sewing, as
L:!e1 this may result personal injury or damage to the machine.
6~1. Sewing
Lower thread
1. While holding the upper th~ead with your fingers.
turn the machine pulley by hand toward you until
the lower thread
comes out onto the feed dog.
2.
Pull the lower thread toward you and check that it
pulls
out smoothly.
3. Turn on
the power switch.
4. Depress the treadle to start sewing.
When the reverse lever 0 is pushed, the material feed
direction will be reversed, and when it is returned to
its original position, the feed direction
will change back
to normal.

7. THREAD TENSION
7-1. Adjusting the thread tension
Upper thread ~ .,.,."""
Lower thread ---
Lower thread
Good even stitches
Upper thread tension too weak or lower thread tension too
strong
Upper thread tension too strong or lower thread tension
too weak
• Upper thread tension
The tension of the upper thread is adjusted using the
tension thumb
nut O.
To increase the tension of the upper thread, turn the
tension
thumb nut 0 to the right. To decrease ten-
sion, turn the tension thumb nut 0 to the left.
• lower thread tension
A CAUTION
A • Tum off the powerswitch before removing or
L.:!:':l inserting the bobbin case.
The
motor will keep turning even after the
power is switched off as a result of the
motor's inertia. Wait until the motor stops
fully before starting work. The machine
may operate if the treadle is pressed by
mistake, which could result in injury.
Adjust
by tuming the thread tension nut 0 until the bob-
bin case will not drop by its own weight while the thread
end coming out of the bobbin case is held.
7-2. Adjusting the presser foot pressure
More pressure ~ Less pressure
/""--
Adjust the presser foot pressure to lower as much as
possible so that the presser foot can properly hold
down material by turning the screw O.

8. STANDARD ADJUSTMENTS
A CAUTION
Maintenance and inspection of the sewing
machine should only be carried out by
qualified personnel.
Ask
your SEIKO dealer or a qualified elec-
trician to carry out any maintenance and
inspection of the electrical system.
If any safety devices have been removed,
be absolutely sure to re-install
them to their
original positions
and check that they op-
erate correctly before using the machine.
Turn off
the power switch and disconnect
the power cord from the wall outlet at the
following times, otherwise the machine
may operate if the treadle is pressed by
mistake, which could result in injury.
However, the
motor will keep turning even
after
the power is switched off as a result
of
the motor's inertia. Wait until the motor
stops fully before starting work.
• When carrying out inspection, adjust-
ment and maintenance
• When replacing consumable parts such
as the rotary hook
If the powerswitch needs to be left on when
carrying out some adjustment, be ex-
tremely careful to observe all safety pre-
cautions.
8-1. Adjusting the thread controller spring
.. Operating range of spring
Thestandard operating rangefor spring0 is 5-10mm.
1. loosen the screw e, and thenturn the thread con-
trollerspring
stop e to adjust the operating range.
• For more operating range, move the spring
stop e to the right.
• For less operating range, move the spring stop
e to the left.
2. Tighten
the screw 8 .
.. Tension of the spring
The standard tension for spring 0 is 0.39-0.78 N (40-
80g).
1. Loosen the tension thumb nut C) and screw 0.
2. Turn the tension stud 0 to adjust the tension.
• To increase the spring tension, slightlyturn the
tension stud 0 counterclockwise.
• To decrease the tension, turn the stud clock-
wise.
3. After adjustment, tighten the tension thumb nut
C) and screw 0.

8-2. Adjusting the height of the feed dog
The maximum height of the feed dog 0 from the sur·
face of the needle plate 6 is normally 1 mm. To ad-
just the height of the feed dog:
1. Tilt the machine head away from you. Turn the
pulley to raise the feed dog 0 to its highest posi-
tion.
2. Loosen the screw 8.
3. Raise or lower the feed dog 0 as necessary.
4. Tighten the screw 8.
8-3. Adjusting the feed dog position (longitudinal)
31.5mm
1. Change the feed amount to the smallest possible
setting.
2. Turn the pulley to raise thefeed dog 0 to its high-
est position.
3.
Tilt the machine head away from you.
4. Loosen the screw 6, and then move the feed rock
shaft crank 8
to adjust so that there is a distance
of 31.5mml from the
edge of the needle plate 0
to the center of the needle hole on the feed dog
O.
5. Securely tighten the screw 8.

8-4. Adjusting the Positions of the needle and needle hole of the feed dog
.. II
--~
~dlehOle
( __ center
Needle
Feed dog
I
Turning the pulley to lower the needle bar 0 slowly,
check whether the needle descends to the center of
the needle hole of the feed dog or not.
If the needle does not enter into the center of the hole:
1. Remove the cover and loosen the screw f) slightly.
2. Holding the needle bar rock frame e, move it as
may be required to get the correct position to the
feeder.
3. Tighten the Screw 8 and close the cover.

8·5. Adjusting the timing the needle with feed
Q -J:
--
~l
It is important that the timing relationship between
the needle on its downward stroke and the feed dog
movement
is maintained at all times. When the scart
of the needle on the downward stroke reaches
the top
surface of the feed dog, the feed dog
movement must
start. When adjustment is required, use the following
procedure to change the position of cam
O.
1.
2.
3.
4.
5.
6.
Change the feed amount to the largest possible
setting.
Loosen
the screw 6 for cover plate e and the
screw 0 for oil reservoir 0, and then remove the
cover plate e and the
oil reservoir 0.
Normally put the arrow mark 0 of the cam 0 on
the Vditch @ of arm shaft.
Turn the machine pulleyto the needle at 1
mm up
from its lowest point.
And. pushing the reverse lever up and down. turn
the
cam., and set this atthe point both the needle
and the feed dog rest.
After
positioning completed. tighten the each
screw securely.
8-6. Adjusting the height ofthe needle bar
<Needle bar highest point>
Needle plate
22.3mm
When the needle bar., is at its highest point. nor-
maUy the measurement between the surface of the
needle plate and the upper end of the needle eye is
22.3mm.
1. Loosen the screw 6 and move the setting posi·
tion of the needle bar., to get the correct posi·
tion,
2. Tighten the screw 6.

8-7. Adjusting the timing between the needle and the hook
2.4mm
O.02-0.1mm
After setting the needle bar heighl, set stitch length to
minimum, turn the machine pulley toward you until the
needte bar reaches its lowest point. Continue turning and
allow the needle bar to raise about 2mm while on its up-
ward stroke. With needle bar in this position, the point of
the sewing hook should be at the center of the needle,
and normallY,the measurement between the hook point·
and the upper
end of the needle eye should be 2.4mm,
further the clearance between the hook point and the
needle hollow should
be about 0.02 to 0.1 mm.
* If they are
not measured as above. perform the
adjustments below.
• Adjusting the timing
1. Loosen the three set screws O.
2. Turn the hookshaft 8 to align the hookpointwith
the center of the needle.
3. Tighten the three set screws 0 and re-check the
tim ing of the sewing hook.
• Adjusting the clearance
1. Loosen the two screws e slightly.
2. Move the hook 0 to the right orto the left as may
require.
• Please note one of the two screws e is placed
on
the V ditch of hook shaft. Therefore. keep
the screw on V ditch during adjustment.
3. Tighten the two screws e.