Seiko JW-8BL-20 User manual

OPERATING INSTRUCTIONS
FOR
JW-8BL-20 JW-28BL-20
JW-8BL-30 JW-28BL-30
SEIKO SEWING MACHINE CO., LTD.
TOKYO JAPAN
From the library of: Superior Sewing Machine & Supply LLC

OPERATING INSTRUCTIONS SEIKO JW SERIES MODEL
This is a guide to use of SEIKO JW series model long-arm high speed for heavy-
duty materials sewing machine with compound feed and walking foot feeding
mechanism, under the best condition.
Please read this guide thoroughly so that you may expect good performance.
Specifications
SINGLE NEEDLE
JW-8BL-20 JW-8BL-30
MAX. SPEED (s.p.m.)
1,600
MAX. STITCH (mm)
10
MAX. LIFT OF FOOT (mm)
20
NEEDLE
DY X3 (sandard No. 24) • SY5213 . 794
BOBBIN SIZE (mm)
37?>x 13
WORKING SPACE (mm)
508X153
762X153
BED DIMENSION (mm)
846X230
1,100x230
POWER REQUIRED (W) 400W,2P
MOTOR PULLEY DIA.(mm)
7Oi'^/ 6O0 (50/60HZ)
NET/GROSS WEIGHTSM^ 109/kgs. 151/kgs. 0.377/M3
TWIN NEEDLE
JW-28BL-20 JW-28BL-30
MAX. SPEED (s.p.m.)
1,500
MAX. STITCH (mm)
10
MAX. LIFT OF FOOT (mm)
20
NEEDLE
DY X3 (sandard No. 24) • SY5213 • 794
BOBBIN SIZE (mm)
37^.x 13
WORKING SPACE (mm) 508X153
762X153
BED DIMENSION (mm) 846 X 230 1,100x230
POWER REQUIRED (W) 400W, 2P
MOTOR PULLEY DIA.(mm) 60^/509* (50/60HZ)
NET/GROSS
WEIGHTS M^
112/kgs. 154/kgs. 0.377/M3
NEEDLE SPACING
3/16" (4.7 mm), 2-3/8" (60 mm). Standard 1/4"(6.4mm)
CODE EXPLANATION
J : Jumbo (Super Long Arm)
W : Horizontal Hook
B : Reverse Stitch
L : Large Hook & Bobbin
8 : Single-Needle with Compound Feed &Walking Foot
20: 508 mm (20 inch) Working Space
28: Twin-Needle with Compound Feed &Walking Foot
30: 762 mm (30 inch) Working Space
USE FOR
Tent, Sail Clodi, Rubberized Fabrics, Heavy Synthetic, Heavy Upholstery Materials, Fiber
Plate, Leather, etc.
From the library of: Superior Sewing Machine & Supply LLC

1
— INDEX
CONTENTS
Page
Setting up the machine 2
Caution before starting
the operation 2
Oiling 2 —3
Needle 3
Thread 4
Winding the lower thread on the bobbin 4
Removing
and inserting the bobbin 4
Threading the needle 5
Regulating the thread tensions 5
Adjustment of the stitch 6
Adjustment of the pressure 6
Reverse stitching 6
INSTRUCTIONS FOR ADJUSTMENT
Relative position of vibrating and lifting presser bar, also, of the needle
and the needle hole of the feeder 7
Adjustment of the height of the feed dog 7
Timing between
the hook and the needle 8
Adjustment of bobbin case opener 9
Adjustment of the height of the presser feet 9
Timing of the vibrating and lifting presser feet 10
Adjustment of the clearance for the vibrating and lifting presser feet 10
Adjustment of the thread controller spring 11
Replacement of the connection belt 11- 12
To re-engage the safety clutch 13
Adjustment of the built-in bobbin winder 14
Adjustment of the oiling for the hook saddle 14
Treadle assembly complete set 15
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SETTING UP THE MACHINE (Fig.1)
Setting up the machine on the table after removed two pieces of supporting
bolts (A) under the bed.
CAUTION BEFORE STARTING THE OPERATION
1. Do not operate the machine, even if only for testing and or idling, unless it
has been properly oiled at every spot and reservoir required lubrication.
During practice period the new machine should be oiled more frequency.
2. The machine pulley turns toward to the operator.
(The auxiliary hand wheel turns to clockwise.)
3. Do
not opearate the machine at maximum speed of 1,500 s.p.m., for starting
operation. To take practice operation at speed of 1,000 s.p.m., but opera
ting speed are to be changed to proper condition suitable for the materials in
case by case.
OILING (Figs.2,3,4&5)
1. Oil should be applied at each of the place designated by arrows in Fig. 2, 3,
4&5.
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2. To fill the oil for reservoir of hook saddle from the hole after taken out the
oil gauge (Fig. 6 A) and pour the oil until the oil level reached to the upper
reference line of the oil gauge (Fig. 6-1 B).
3.
When in continuous use, it should be oiled at least twice a day.
'J.
Fig. 6-1
NEEDLE (Figs.7 &8)
1. SEIKO JW series machines are set up to use standard needle of DY x 3
(standard No. 24) • SY5213 • 794.
The size of needle to be used should be determined by the size of thread,
type and thickness of the sewing materials.
2. To insert the needle, turn the machine pulley over toward you until the
needle bar moves up to its highest point, put the needle up into the needle
bar as deeply as it will go, with the long groove of the needle faced outside
(28BL).
Tighten the needle set screw securely.
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THREAD (Fig.9)
Normally, left twisted thread Is used for upper (needle) thread. (But, for left
side needle of twin-needle 288 L machine. It can be finished in fine results with
right twisted thread.)
Left Twist
Right Twist
WINDING THE LOWER THREAD ON THE BOBBIN (Figs. 10 &11)
1. Pass the thread through (1) - (4), and wind several times arround the bobbin
which set up to the shaft of bobbin winder. (5)
2. Press
the lever (6) to arrow direction, then the bobbin winds the thread auto
matically, In engage with the operation of the machine.
The bobbin will automatically be stopped after the bobbin is filled with
thread.
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Fig. 10
REMOVING AND INSERTING THE BOBBIN (Figs. 12 &13)
1. Draw
back the side plate (1) on the bed of the machine, and raise the hinged
latch (2) to avertical position, then remove and insert the bobbin.
2. Insert the bobbin and pull thread out about 4—5cm(3), then push down the
hinged latch (2) and draw the thread end under the tension spring (4).
3. When closing the side plate (1), leave just enough space for the thread to pass
through.
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THREADING THE NEEDLE
1. Pass the thread from thread guide (1) - eyeiet (2) - tension disc (3) - tension
thread guide (4) - guide (5) - thread take-up spring (6) - guide (7) - take-up
lever (8) - guide (7) - lowerguide (9) -self threading needle bar thread guide
(10) - through the eye of the needle (11),
(Remark) Wind the thread a single time to tension thread guide (4).
2. With
the left hand hold the end of the needle thread leaving it slack from the
hand to the needle. Turn the machine pulley over toward you until the
needle moves down and up again to itshighest point, thus catching the bobbin
thread, draw up the needle thread, and the bobbin thread will come up with
it through
the hole in the feed dog. Lay the threads back under the presser
feet and close the slide.
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REGULATING THE THREAD TENSIONS (Figs. 16 &17)
1. The tension on the needle thread is regulated by the thumb nut (Fig. 16 A).
2. The tension on the bobbin thread Is regulated by the screw of the tension
spring on the outside of the bobbin case (Fig. 17 A).
To increase the tension, turn over nut or screw to the right, and to decrease
the tension, turn over nut or screw to the left.
Fig. 16
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ADJUSTMENT OF THE STITCH LENGTH (Fig.18)
The length of stitch is regulated by pressing down the button (1) with left hand,
while turning the machine pulley (2) slowly with right hand in the condition of
setting the top of button (1) to the feed eccentric.
To increase the length of stitch, turn the machine pulley over toward you. To
decrease the length of stitch, turn the machine pulley to opposite direction.
When the desired length of stitch is obtained, operate the machine after fully
confirmed releasing the button (1) to the original position.
Fig. 19
ADJUSTMENT OF THE PRESSURE (Fig.19)
The pressure of the presser feet is regulated by the adjusting screw.
To increase the pressure, turn the screw to clockwise, and decrease it, turn the
screw to counter-clockwise.
REVERSE STITCHING (Fig. 20)
The chain for the feed reversing pedal is connected to the hook of feed reversing
lever (A) underneath of the bed of the machine.
To feed the work toward you, press down firmly on the feed reversing pedal,
and do not stop to press down on the way.
Fig. 20
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INSTRUCTIONS FOR ADJUSTMENT
RELATIVE POSITIOlU OF VIBRATING AND LIFTING PRESSES BAR, ALSO, OF THE
NEEDLE AND THE NEEDLE HOLE OF THE FEEDER (Figs.21 & 22}
1. The distance between the vibrating presser bar (1) and lifting presser bar (2),
after adjusting the feed eccentric so that there is no feed movement of the
needle bar, should be 15.5 mm (one needle) and 14.5 mm (two needle).
To adjust by the screws for connecting crank (3).
2. Normally, relative position of the feed dog against the needle, the needle
should be passed through the center of the needle hole of the feed dog.
To adjust by the screw for the feed rock shaft bell crank (4).
3. Securely tighten the screws after finished adjustment.
A I.
ADJUSTMENT THE HEIGHT OF THE FEED DOG (Figs. 23,24 & 25)
The maximum height of the feed dog from the surface of the needle plate is
normally 1.3 mm.
To adjust this height by the screw on the feed lifting cam fork of the feed bar
and raise or lower the feed dog, as may be required, and retighten thescrew (1).
1.3mm
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TIIVlliyG BETWEEN THE HOOK AND THE NEEDLE (Fig.26)
Set the feed eccentric with the button at no feeding position, and confirm the
length between vibrating and lifting presser bar should be 15.5 mm.
1. If the needle bar and sewing hook are correctly timed, the point of the hook
will be at the center of the needle when the needle raised 3.8 mm ± 0.5 mm
from the lowest point.
For the adjustment of timing, loosen 2screws (1) for hook driving gear, and
tap this gear to the right or left in clearance of 2 mm on the hook driving
shaft until the point of the hook Is at the center of the needle.
Tapping to the right gives on earlier hook timing, and to the left gives later
hook timing.
Except the above case, to adjust in changing gear condition between hook
driving gear (2) and hook shaft gear (3).
Securely tighten the 2 set screws for hook driving gear after finished adjust
ment.
2. Normal clearance between hook point and scarf of the needle is In 0.02 • 0.1
(1) Loosen two screws (4) and (5) for
hook saddle.
(2) Move hook saddle to right or left,
as may be required, until hook
point is as close to needle as pos
sible without striking it.
(3) Then securely tighten two screws.
(4) To check the needle with careful
attention free from bent before
adjustment.
3. Height of the needle bar (Fig. 27).
Normal clearance between top of the
eye of the needle and hook point is
2.2 mm.
In case the needle bar is incorrectly
set, loose the needle bar connecting
stud pinch screw (A) and place the
needle bar in correct position as re
quired above, then retighten the screw
(A).
Fig. 26
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ADJUSTMENT OF BOBBIN CASE OPENER (Fig.28)
1.
Turn the machine pulley or hand wheel (Fig. 31 D & E) until the top of the
opener is located at the distance from the needle plate.
2. In this position, adjust it so that the clearance between the inside edge of the
opener (A) and the top of the hook is about 0.3 - 0.8 mm.
3. Securely tighten the screw (B) after finished adjustment.
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Fig. 28
13
Fig. 29
ADJUSTMENT OF THE HEIGHT OF THE PRESSER FEET (Figs. 29,30 &31)
Normal distance between the surface of the needle plate (A) and vibrating pres-
ser foot at stopped position of the stop lever (C) is 19 mm.
When step on the lifting pedal, the stop lever (C) will be released by the lifting
lever (B).
1. To change the relative lift of the presser feet, loosen the screw (1) at the
above condition.
2. The height of lift of the presser feet is adjustable by moving the screw of
presser bar lifting bracket.
3. Normal distance between presser bar position guide bracket (3) and presser
(Dar position guide (4) is 7 mm.
Position of the vibrating presser foot to shift in left and right is to be adjusted
by the screw (2) for presser bar lifting bracket and the screw (5) for presser bar
position guide bracket.
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Fig. 30
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10
TIMING OFTHE VIBRATING AND LIFTING PRESSER FEET (Fig. 32)
The amount of lift of the vibrating and lifting presser feet
should be regulated according to thethickness of materials
being sewn.
The feet should lift just enough to clear the materials. 0
As a rule, the vibrating and lifting presser feet should lift
an equal height, but some grades of work may require that
they lift an unequal height.
To change the relative lift of the presser feet, loosen the
screw (A) for lifting rock shaft crank and move the vibra
ting presser bar upward or downward as required, then
securely tighten the screw (A),
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Upper Surface
Fig. 32
ADJUSTMENT DF THE CLEARANCE FDR THE VIBRATING AND LIFTING PRESSER
FEET (Fig. 33) (RE-ADJUSTMENT THE TIMING OF THE VIBRATING AND LIFTING
PRESSER FEET-Fig. 32)
The amount of the lift of the alternating feed for the vibrating and lifting pres
ser feet are to be adjusted by the lifting bell crank link screw stud (1).
To decrease the movement in setting the stud (1) at the upper position, and to
increase the movement in setting the stud (1) at the lower position. After setting
to the required position, securely tighten the stud (1) with nut (2).
The clearance for the vibrating and lifting presser feet are being adjusted at max
imum, so that the clearance of them should be adjusted according to the materi
als being sewn.
The timing position for the vibrating and lifting presser feet should be regulated
by Fig. 32.
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ADJUSTMENT OF THE THREAD CONTROLLER SPRING (Fig.34)
1. For more controller action on the thread, loosen the set screw (1) at the right
of the controller and set the stop lever, and for less action set the stop higher.
2. To strengthen the action of the controller spring on the thread, loosen the
spring stud screw (4) at the rear of the stop screw and turn the spring stud (5)
slightly to the left with ascrewdriver, or lighten its action turn to the right
and securely retighten the spring stud screw.
Fig. 34
REPLACEMENT OF THE CDNNECTIGN BELT
A.When the connection belt removed from the pulley for adjusting and or re
placing purposes of the parts, it should be replaced by the processes, as fol-
lowings: (Figs.
35 & 36)
1. Turn the machine pulley toward you so that placed the take-up lever (A)
at the highest position.
2. Turn the hook shaft with the fingers until the arrow mark on the hook
driving shaft bushing collar (2) and the red point mark on the hook driv
ing shaft bushing (1) are directly In line. Then replace the belt over the
the
upper and lower pulley.
Fig. 35
Fig. 36
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12
B. Replacement of the connection belt when damaged. (Figs. 37 & 38)
1. Remove the upper arm plate and reservoir.
2. Slide the connection belt (A) off from lower and upper belt pulley,
3. Loosen
the machine pulley adjustment screw (2) and two set-screws for
the machine pulley (3), then remove the machine pulley.
4. Loosen
the three screws in the arm shaft bushing (5) and remove the bush
ing (6).
5. Lift the belt up through the arm cap hole after removed the bushing (6) as
far as possible and draw it out through the space normally occupied by
the bushing.
6. Replace the connection belt as opposite processes as above for removing it.
7. Securely
tighten all the screws, so as to fit the arm shaft, firmly, free from
looseness.
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Fig. 37
Fig. 38
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13
TO RE-ENGAGETHE SAFETY CLUTCH (Figs. 39 &40)
The hook driving shaft and the shaft of the sewing hook are spllned to prevent
the hook from getting out of time. The safety clutch located In the lower belt
pulley prevents damage in the event of thread jamming in the sewing hook by
releasing the locking lever in the pulley.
1.
Take out jammed thread from the hook.
2. To re-engage the clutch, press down the lock stud (A), near the base of the
arm by left hand and turn the machine pulley backward slowly by right hand,
then the safety clutch will be released.
3. In
the case easily releasing the safety clutch, adjust the pressure by the screw
(B) for lower belt pulley after removed connection belt (C).
To increase
the pressure in turning the screw (B) to clockwise and to decrease
the pressure in turning the screw (B) to counter-clockwise.
Fig. 39
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14
ADJUSTMENT OF THE BUILT-IN BOBBIN WINDER (Figs.41 &42)
Adjust the volume of winding thread to the bobbin by the adjustment screw (1)
for the winder in turning it to up and down.
Remove the plate (2) on the front of the arm and adjust the slipage of the shaft
for the winder by the winder driving gear (3) in the arm shaft to shifting right
or left.
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ADJUSTMENT OF THE OILING FORTHE HOOK SADDLE (Fig.43)
Loosen
the screw for the oil adjustment dial (3) and adjust oil supply by turning
the oil adjustment dial (2). Maximum oil supply at the directly in line of the
point mark (1) on the hook saddle and the center line of the dial (2). Stop the
oil supply at the vertical position of the center line of the dial (2).
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15
TREADLE ASSEMBLY COMPLETE SET
a. Construct treadle assembly complete set as shown.
b. Chain 1 , 2 , 3 are strained tightly.
c. Chain 3 is hooked crank one side, and the other hook of chain 3 is dinged
the hole drilled stand horizontal plate.
Chain 3 is used as stopper to prevent treadle 4 is not hit by camfollower.
d. Screw 6 is drived tightly
after crank set up correctly.
Completion of Treadle Set
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-MEMO-
From the library of: Superior Sewing Machine & Supply LLC