JUKI FLS-350N Series Quick start guide

R
ENGINEER’S MANUAL
29311107
No.01
Electronic Handstitching Machine
FLS-350N Series

PREFACE
This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance
of the machine.
The Instruction Manual for this machine intended for the maintenance personnel and operators at an apparel
factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, Adjustment
Procedures”, “Results of Improper Adjustment”, and other important information which are not covered in the
Instruction Manual.
It is advisable to use the relevant Instruction Manual and Parts List together with this Engineer’s Manual when
carrying out the maintenance service of this machine.
Regarding the motor for the sewing machine with automatic thread trimmer, separately refer to the Instruction
Manual for the motor and Engineer’s Manual. In addition, for the control panel, refer to the Instruction Manual
for the control panel.
This manual gives the “Standard Adjustment” on the former page under which the most basic adjustment value
is described and on the latter page the “Adjustment Procedures” and “Results of Improper Adjustment” under
which the steps of adjusting procedure, and stitching errors and troubles arising from mechanical failures are
described.

CONTENTS
1. SPECIFICATIONS ...................................................................................... 1
2. EXPLANATION OF UNITS......................................................................... 2
(1) Configuration .............................................................................................................2
(2) Operation panel (1Operation panel) .......................................................................3
3. EXPLANATION OF STITCH LENGTH COMPENSATION FUNCTION..... 5
(1) Function.....................................................................................................................5
1) In case the upper stitch becomes small...........................................................................................5
2) In case the upper stitch becomes large ...........................................................................................5
(2) Operation...................................................................................................................5
4. NEEDLE BAR CURVE AND TIMING ADJUSTMENT CHART ................. 6
5. STANDARD ADJUSTMENT ...................................................................... 8
(1) Before making the adjustments ................................................................................8
(2) Adjusting the home position (adjusting the graduation)............................................8
(3) Adjusting the needle bar groove cam and the left looper cam ...............................10
(4) Adjusting the needle bar.........................................................................................12
1) Adjusting the height of the support cylinder of the upper needle bar.............................................12
2) Adjusting the height of the support cylinder of the lower needle bar .............................................12
3) Adjusting the timing of transferring the needle ..............................................................................14
4) Centering the needle bar ...............................................................................................................14
(5) Adjusting the needle guide claw .............................................................................16
1) Adjusting the needle and the needle guide claw ...........................................................................16
2) Adjusting the thread tension of the needle guide claw ..................................................................16
3) Adjusting the timing of opening/closing the tubular cam of the needle guide claw........................18
(6) Adjusting the thread path guide..............................................................................18
(7) Adjusting the thread haul lever ...............................................................................20
1) Cam timing.....................................................................................................................................20
2) Adjusting the thread haul lever ......................................................................................................20
(8) Adjusting the brush cam .........................................................................................22
(9) Adjusting the hook finger ........................................................................................22
1)Adjusting the movement amount of the hook finger .......................................................................22
2) Adjusting the rotating shaft and the tension spring........................................................................24
3) Adjusting the clearance between the hook finger and the needle .................................................24
(10) Adjusting the hook finger to release the thread tension .......................................26
(11) Adjusting the eccentric amount of the eccentric pin .............................................26
(12) Adjusting the lower feed .......................................................................................28
1) Adjusting the feed eccentric boss and the lifting cam....................................................................28
2) Adjusting the height of the lower feed dog and the throat plate.....................................................28
(13) Adjusting the upper feed dog and the lower feed dog ..........................................30
(14) Adjusting the presser foot.....................................................................................30
(15) Adjusting the upper feed eccentric shaft ..............................................................32

(16) Adjusting the left looper ........................................................................................32
(17) Adjusting the right looper cam..............................................................................34
(18) Adjusting the right looper......................................................................................34
1) Adjusting the right looper pin .........................................................................................................34
2) Adjusting the relationship between the right looper and the needle ..............................................36
(19) Adjusting the position of the ellipse gear..............................................................36
(20) Adjusting the lower looper ....................................................................................38
1) Adjusting the lower looper arm ......................................................................................................38
2) Disassembling and assembling the lower looper...........................................................................38
(21) Adjusting the command block and the proximity sensor ......................................40
(22) Adjusting the feed, reverse stitching position, and the proximity sensors ............40
(23) Adjusting the needle stopping position.................................................................42
(24) Adjusting the tension of the timing belt of the feed stepping motor......................44
(25) Adjusting the threader needle during replacement...............................................44
(26) Adjusting the angle of the foot pedal, and the foot pressure of the pedal (FLS-350N only) ..... 46
(27) Servomotor controller box connection diagram ....................................................46
(28) Disassembling/assembling the needle bar...........................................................48
(29) Removing the snap ring when disassembling the needle bar ..............................50
6. ELECTRICAL COMPONENTS ................................................................ 52
(1) Printed circuit boards in the control box..................................................................52
7. MAINTENANCE AND INSPECTION ....................................................... 53
(1) Electrical components.............................................................................................53
(2) Mechanical components.........................................................................................53
(3) Consumable parts replacing period table ...............................................................55
8. ERROR CODES ....................................................................................... 56
9. TROUBLES AND CORRECTIVE MEASURES ....................................... 57
(1) Mechanical components.........................................................................................57
(2) Electrical components.............................................................................................59
10. TIME CHART.......................................................................................... 61
11. CIRCUIT DIAGRAM ............................................................................... 62
(1) Layout drawing of the control box...........................................................................62
(2) Circuit diagram........................................................................................................63
(3) Cable wring diagram...............................................................................................64
12. DRWAING OF THE TABLE ................................................................... 65

−1−
1. SPECIFICATIONS
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Item
Model
Sewing speed
Stitch length
(Max. total length of
top/bottom stitches)
Reversefeedstitching
Stitch specifications
Needle *
Thread
(Thread recommended
by JUKI)
Thread length
Type of stitch
Feed type
Change-overofupper
and lower stitch
mechanism (Cloth
feed mechanism)
Threading
Presser foot lifting
method
Presser foot lift
Material thickness
Safety mechanism
Lubricating oil
Grease
Dimensions
Weight of machine
Input power voltage
Power consumption
Motor
Specifications
FLS-350NA
140 to 400 rpm
(300 rpm or less for
synthetic thread)
* It is necessary to change the needle bar when changing the needle size.
0.6 mm to 8 mm
(Up to 16 mm)
FLS-350N
120 to 400 rpm
(300 rpm or less for
synthetic thread)
FLS-351NA
140 to 300 rpm
(250 rpm or less for
easing in of fullness)
0.6 mm to 8 mm
(Up to 16 mm)
In case of easing in of
fullness with synthetic
thread : 0.6 mm to 3 mm
(Up to 6 mm)
ORGAN DPN-1032B/32
KANAGAWA
Co. KNK400mZ
FUJIX Co. KING FIT #60
(Synthetic thread)
Sewing thread 1,200 mm
or less
Actuated by push-button (Stitch length is fixed at 1 to 2 mm for both top / bottom stitches)
1-needle, 1-thread, special stitching (handstitching type)
Short-long stitch Saddle stitch
Top and bottom feed type
Change of upper and lower stitch feed amount by a stepping motor
Manual operation
By a knee-lifter lever
7 mm (when the knee-lifter lever is used)
Max. 2.5 mm
Drum cover open / close protection switch (when opening the drum cover, the sewing machine is not
actuated even when the foot pedal is depressed.)
JUKI New Defrix Oil No. 2 (equivalent to ISO VG32)
ESSO TEMPLEX Grease N2 containing 10g (Part No. 13552206)
Main unit : 1,070 mm (width) X 660 mm (depth) (FLS-350N : 715 mm) X 1,120 mm (height)
Table : 1,200 mm (width) X 800 mm (depth) X 870 to 910 mm (height)
300Kg
700W
SC-1 SC-380
Single phase :
100V, 200V 50 / 60 Hz Single phase : 200V, 220V, 230V, 240V, 380V, 50 / 60 Hz 3-phase : 200V, 220V, 230V, 240V, 380V, 50 / 60Hz
FLS-350NB
140 to 300 rpm
ORGAN DPN-1032B/49
ACE CROWN
Tetoron #8
Sewing thread 1,000
mm or less
ORGAN DPN-1032B/38
FUJIX Co. KING handstitching machine thread
(for light-weight materials)
FUJIX Co. KING FIT #60 (Synthetic thread)
Sewing thread 1,200 mm or less

−2−
2. EXPLANATION OF UNITS
(1) Configuration
!1
!4 !5
!6
!7
!8
!9
@0
@1
@2
@3
1Operation panel
2Reverse stitch switch
™The machine perfomes reverse stitching as long as the push-button is held pressed. The machine resumes
normal stitching when the push-button is released.
(Caution) Reverse stitching should be carried out at the lowest speed within the range of 1 to 3 stitches.
3Sewing machine light
™It lights up when turning the knob mounted on the top of the lamp.
™The lamp support rod is flexible and can be tilted as desired.
(Caution) Unless the power switch is turned ON, the lamp will not light up since the lamp is not energized.
4Handle
This handle can be operated manually.
5Main power switch
™Press the “1” side of the switch, and the control circuit will be energized.
The indicator lamps on the control panel will light up, and the motor that controls the feed mechanism and
the sewing machine will be actuated to retrieve the origin.
™Press the “0” side of the switch, and the power to the machine will be turned OFF.
6Knee-lifter lever
Shift the lever to the right, and the presser foot will go up.
7Drum cover opening/closing knob
When loosening the knob and opening the cover, the safety device will be actuated, and the sewing machine
will not be actuated even when the foot pedal is depressed.
@4
@5
@6
@7
@8
@9
31
1
2
4
5
6
7
8
9
!0
!2
!3

−3−
8Sewing machine foot pedal
™The machine changes the sewing speed from low to high by gradually increasing depressing the front part
of the foot pedal.
™After releasing the foot pedal, the needle will stop at the intermediate resting position in its stroke. (The
needle has two different intermediate resting positions.)
™When this side of the foot pedal is depressed, the needle will stop at the upper position.
™The lowest speed is fixed at 140 rpm (120 rpm) (Depending on the specifications).
9Table fixing clip
™It is used when opening/closing or fixing the machine table.
!0 Presser lifter fixing knob
™The presser foot and the top feed dog can be fixed with this knob.
!1 Slide plate
™The drum and underside of the throat plate can be observed by shifting the slide plate.
!2 Thread trimming blade
™The blade is used to cut and hold the thread.
!3 Table
!4 Head cover
™Open the head cover when replacing the needle.
™Open the head cover when disassembling the needle bar for cleaning.
!55 Eye-guard
™It is a cover that protects eye from a broken needle that jumps out of position.
!6 AC servo-motor
!7 Control box
!8 Needle threading lever
™It is used to thread the needle.
!9 Caster
@0 Adjusting bolt
@1 Thread stand (packed in the accessory box)
@2 Thread guide
™This is a guide that works when drawing thread placed on the spool rest rod.
@3 Stitch ruler
(2) Operation panel (1Operation panel)
@4 Sewing speed LED indicator
The LED lights up to indicate the sewing speed specified by the setting variable resistor locating on the right of
the LED.
@5 Stitch length LED indicator
The LED lights up to indicate the stitch length specified by the setting variable resistor locating on the right of
the LED.
@6 Sewing speed setting variable resistor
Turning this variable resistor clockwise will increase the number of revolutions.
@7 Stitch length setting variable resistor
Turning this variable resistor clockwise will increase the stitch length.
@8 Right side/wrong side stitch indicator
This indicates whether the stitch length is on the upper side or on the lower side.
@9 Stitch selector switch
Pressing the push-button switch changes the right side stitches to the wrong side stitches.

−4−

−5−
3. EXPLANATION OF STITCH LENGTH COMPENSATION FUNCTION
(1) Function
When changing over the upper stitch length or the lower stitch length (turn ON/OFF the stitch length changing
switch.), it is ideal if the stitches are as illustrated in the figure below.
However, there may rarely be some machines, which make the sticthes as shown in the figure below when the
short sticth length is changed to upper stitch or lower stitch.
1) In case the upper stitch becomes small
2) In case the upper stitch becomes large
As shown in the above figure, the upper stitch is not the same as the lower stitch when the stitch length is
changed.
At this time, adjust the stitch length changing variable resistor so that the upper and lower stitches become the
same by adding the stitch length of section (b) of the above figure.
(2) Operation 1) In case of a > a’
1In case of a > a’, the lower stitch is larger than the
upper stitch. Add the compensation amount to the
upper stitch length.
In this case, press up the stitch length change switch,
and adjust the stitch length change variable resistor
so that the lower stitch becomes the same as the upper
stitch.
2) In case of a < a’
2In case of a < a’, add the compensation amount to
the lower stitch length as the upper stitch is larger than
the lower stitch.
In this case, press down the stitch length change
switch, and adjust the stitch length change variable
resistor so that the lower stitch becomes the same as
the upper stitch.
Upper stitch
Lower stitch
Change-over of
stitch length
a = a’
Upper stitch
Lower stitch
aa’
Upper stitch
Lower stitch
Upper stitch
Lower stitch
a
a’
a
Change-over of
stitch length
In case of a > a’
Upper stitch
Lower stitch
Upper stitch
Lower stitch
a
a’
a
Change-over of
stitch length
In case of a < a’
Stitch length
change switch
Up
Small
Stitch length change
variable resistor
Down
Large
(b)
(b)

−6−
4. NEEDLE BAR CURVE AND TIMING ADJUSTMENT CHART
1
• Adjusting the home
position (5.-(2))
• Adjusting the needle bar
groove cam and the left
looper cam (5.-(3))
• Adjusting the lower feed
(5.-(12))
• Adjusting the feed
eccentric boss and the
lifting cam (5.-(12)-1)
• Adjusting the presser
(5.-(14))
2
• Adjusting the height of
the upper needle bar
support cylinder
(5.-(4)-1))
• Adjusting the height of
the lower needle bar
support cylinder
(5.-(4)-2))
• Adjusting the timing of
transferring the needle
(5.-(4)-3))
• Centering the needle bar
(5.-(4)-4))
3
• Adjusting the needle and
the needle guide claws
(5.-(5)-1))
• Adjusting the timing of
opening/closing the
tubular cam of the needle
guide claw (5.-(5)-3))
• Adjusting the thread
tension of the needle
guide claws
(5.-(5)-2))
4
• Adjusting the lower
looper (5.-(20))
Points to be adjusted for each timing
10˚ 20˚ 30˚ 40˚ 50˚ 60˚ 70˚ 80˚ 90˚ 100˚ 110˚ 120˚ 130˚ 140˚ 150˚ 160˚ 170˚ 180˚
2˚
42˚
29.4˚
72.4˚ 75.4˚ 90˚
Needle bar
(upper)
Needle bar
(lower)
12 438

−7−
56 7
5
• Adjusting the thread haul
lever (5.-(7))
6
• Adjusting the thread path
guide (5.-(6))
• Adjusting the hook finger
(5.-(9))
• Adjusting the hook finger
to release the thread
tension
(5.-(10))
7
• Adjusting the left looper
(5.-(16))
• Adjusting the right looper
cam (5.-(17))
• Adjusting the right looper
(5.-(18))
(8)
• Adjusting the brush cam
(5.-(8))
180˚ 190˚ 200˚ 210˚ 220˚ 230˚ 240˚ 250˚ 260˚ 270˚ 280˚ 290˚ 300˚ 310˚ 320˚ 330˚ 340˚ 350˚ 360˚
209.4˚
222˚
270˚
252.4˚
182˚
360˚
360˚
255.4˚

−8−
Standard Adjustment
Standard Adjustment
5. STANDARD ADJUSTMENT
(1) Before making the adjustments
(2) Adjusting the home position (adjusting the graduation)
330˚ 0˚300˚270˚
270˚
255.4˚
252.4˚ 2˚
240˚210˚180˚
Handle
Aluminum plate
Upper dead point
Lower stop
section
Upper stop section
(Home position)
Handle
1
Gear box frame
Arrow mark
Angle board
Handle Main unit table
FLS-350N FLS-350NA • NB
FLS-351NA
FLS-350N FLS-350NA • NB
FLS-351NA

−9−
Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures
Adjustment of the respective functions is indicated by angle board
affixed to the surface of the handle.
Angle indicated by the arrow mark on the gear box cover is the angle
shown in the respective adjustment procedures.
™If the home position shifts, the timing
adjustment cannot be made.
The home position is indicated by “ 0˚ ”, and the standard of all timing
adjustments. The home position alignment is performed by
determining the 2˚ position.
Adjustment procedure
1) Turn the handle, and stop the needle bar when it starts coming
down from the upper stop position. At this time, loosen the
setscrews (6 pcs.) in the angle board 1so that the arrow mark
points to 2˚. After adjusting the position, fix the angle board.
The upper stop position is slightly lower than the upper dead point,
and located at a place where the height of the needle bar does
not change for a certain section. Be careful not to mistake it for
the upper dead point.
2) Turn the handle. The place where the arrow mark points to “ 0˚ ”
is the home position.

−10 −
(3) Adjusting the needle bar groove cam and the left looper cam
Guide metal
fitting
Cord
Setscrew D
V belt
Angle board
Gear box cover
Left looper cam
configuration
Fixing holes
Positioning
hole ø8
Groove cam wheel
Setscrew B
Setscrew A
Left looper cam
ø8
C
4-ø9
125mm
120 mm
F
Standard Adjustment
FLS-350N
FLS-350NA • NB
FLS-351NA
Setscrew D
V belt
Gear box cover
C
Guide metal
fitting
Cord
F
Angle
board

−11 −
Disassembly procedure
1) Loosen setscrew C, and remove the gear box cover.
2) Loosen setscrew F, and turn the guide metal fitting fixing the
synchronizer. Then remove the synchronizer.
3) When loosening setscrew Dlocated inside the angle board, the handle
and synchronizer can be removed together.
4) Remove the V belt.
5) Remove setscrewBinthe groovecam wheel,and drawout the groove
cam wheel from the center shaft.
6) Loosen setscrew A, and remove the left looper cam.
Assembly procedure
In case of FLS-350N
1) Bring the left looper cam setscrew tap to the up and down position of the
rotating shaft.
2) Install theleft loopercam asillustrated in thefigure, andtighten setscrew
A.(Placetheleftloopercamfixingholesandthetapatthesamepositions
as when they were removed.)
3) When attaching the groove cam wheel, insert a ø8 pin supplied as an
accessoryintotheholeinthegroovecamwheel.Afteradjustingtheposition
of the groove cam wheel and the left looper cam, tighten setscrew B .
When setting the groove cam wheel on the left looper cam, first fit it over
the center shaft. Then fit the cam follower in the groove of the groove
cam while pressing the lower cam follower outward (the upper cam
follower can be easily fitted in the groove).
Afterboth camfollowers havebeen properlyfitted inthegroove, position
them quietly taking care not to allow them to come in contact with each
other. When attaching the handle, allow the ø8 positioning hole in the
left looper cam to face exactly toward the right-hand side, and allow the
0˚ scale of the angle board to face upward. Refer the adjustment to item
5-(2) “Adjusting the home position”.)
★When the positioning holes of the left looper cam and the groove
cam wheel are faced exactly toward the right-hand side, the upper
end section becomes “ 0˚ ”.
In case of FLS-350NA • NB and FLS-351NA
1) Bring the left looper cam setscrew tap to the up and down position of the
rotating shaft.
2) Install theleft loopercam asillustrated in thefigure, andtighten setscrew
A.(Placetheleftloopercamfixingholesandthetapatthesamepositions
as when they were removed.)
3) When attaching the groove cam wheel, insert a ø8 pin supplied as an
accessoryintotheholeinthegroovecamwheel.Afteradjustingtheposition
of the groove cam wheel and the left looper cam, tighten setscrew B .
When setting the groove cam wheel on the left looper cam, first fit it over
the center shaft. Then fit the cam follower in the groove of the groove
cam while pressing the lower cam follower outward (the upper cam
follower can be easily fitted in the groove).
After the both cam followers have been properly fitted in the groove,
slowly place the groove cam until it will go no further taking care not to
allow them to come in contact with each other. When attaching the
handle,allow theø8positioning holeinthe leftloopercam tofaceexactly
toward the right-hand side, and allow the 0˚ scale of the angle board to
face upward. Refer the adjustment to item 5-(2) “Adjusting the home
position”.)
★When the positioning holes of the left looper cam and the groove
cam wheel are faced exactly toward the right-hand side, the upper
end section becomes “ 0 ˚ ”.
™If the position shifts, the timing
between the left looper cam and the
needle bar shifts, and they come in
contact with each other.
Adjustment Procedures Results of Improper Adjustment

−12 −
1) Adjusting the height of the support cylinder of the upper needle bar
2) Adjusting the height of the support cylinder of the lower needle bar
Upper needle bar
Setscrew B
Setscrew A
Arm
Upper eccentric pin
Bush
Locknut
Needle bar
Surface of the
throat plate
Elevating boss
Upper eccentric pin
Crank slide block
Support cylinder of
the upper needle bar
Gauge
A
12 ±0.2 mm
Lower needle bar
Setscrew B
Lower eccentric pin
Arm
Setscrew A
Support cylinder of
the lower needle bar
Gauge
Support cylinder of the
upper needle bar
Support sleeve B
23.2 ±0.2 mm
(4) Adjusting the needle bar
Standard Adjustment

−13 −
Adjust so that the distance from the support cylinder of the upper
needle bar to the support cylinder of the lower needle bar is 23.2 ±
0.2 mm when they come closest to each other in their stroke (35˚ to
37˚).
Loosen setscrew A, and using the gauge adjust the height of the
support cylinder of the lower needle bar. When finely adjusting the
height of the support cylinder of the lower needle bar, loosen setscrew
B, and turn the lower eccentric pin.
Apply the minus tolerance when adjusting the distance between the
support cylinders when they come closest to each other in their stroke
Open the throat plate on the left-hand side, and use the gauge with
turned upside down.
Dimension B of the gauge is 23 mm.
* Perform this adjustment after checking that 4-(4)-1) “Adjusting the
height of the support cylinder of the upper needle bar” has been
performed.
™If the height shifts, needle
transferring cannot be properly
made, causing needle breakage.
™If the closest distance shifts, needle
tranferring cannot be properly
made, causing needle breakage.
Bring the support cylinder of the upper needle bar to its lower stop
position (within the range of 42˚ to 209.4˚). Loosen two setscrews A,
and adjust so that a distance of 12 ±0.2 mm is obtained between the
throat plate and the support cylinder. When finely adjusting the
distance, loosen setscrew B, and turn the upper eccentric pin.
Dimension A of the gauge is 12 mm.
Adjustment Procedures Results of Improper Adjustment

−14 −
3) Adjusting the timing of transferring the needle
4) Centering the needle bar
Locknut
Adjustment nut
Rubber washer
Upper
needle bar
Needle
Lower
needle bar
Rubber washer
Locknut Adjustment nut
Elevating
boss
Support cylinder
Stop pin
Retaining ring
Engraved line Support sleeve
Side view
Pin Connection groove
Front view
A
Standard Adjustment
1
1

−15 −
Loosen the upper and lower locknuts 1to loosen the adjustment
nuts. Turn the handle by hand to bring the needle to the transfer
position.
1) Adjusting the upper needle bar components
1The needle is tranferred from the upper needle bar to the lower
needle bar.
2Turn the adjustment nut counterclockwise until the needle
nearly leaves the upper needle bar. (Turning the adjustment
nut counterclockwise will bring the needle to a position where
it will remain in the upper needle bar, or turning the nut
clockwise will bring the needle to a position where it will leave
the upper needle bar. Find a position in between the
aforementioned two positions.)
3Give the adjustment nut a 1/2 to 3/4 clockwise turn, and fix the
nut with the locknut.
2) Adjusting the lower needle bar components
1When the needle is transferred from the lower needle bar to
the upper needle bar, bring the needle to the position where it
nearly leaves the lower needle bar as in the case of transferring
the needle from the upper needle bar to the lower needle bar.
Then give the adjustment nut a 1/2 to 3/4 counterclockwise
turn, as viewed from above. Then fix the adjustment nut with
the locknut.
After the adjustment, penetrate the needle into the material to check
that the needle is securely caught.
™Check that the needle does not
move up or down (from up to down,
from down to up) after transferring
the needle.
™Check the catching of the needle
when the material used becomes
thick. If the catching is not proper,
causing needle breakage.
To confirm, check whether the
threading needle smoothly enters
the needle eyelet.
™If the adjustment is not proper,
wobbling and irregular stitch length
will occur.
After disassembling the needle bar or if stitch wobbling or upper/
lower irregular stitch length occurs, adjust the center of the needle
bar.
1) Adjusting the center of the needle bar using the support cylinder
Change the direction of the groove of the needle bar connection
of the elevating boss by 90˚. At this time, draw out the retaining
ring and stop pin from the support ring, and also change the
direction of the support sleeve by 90˚.
2) Adjusting the center of the needle bar using the support sleeve
If the direction of the needle bar connection is not changed, change
the direction of the support sleeve by 180˚.
Perform adjustment 1) or 2), and align the center of the upper
needle bar with the center of the lower needle bar.
Carefully check the direction of the support sleeve. (The long
groove in section Ashould look sideways as observed by the
operator.)
An engraved line has been made at the time of delivery. So use it
as reference when disassembling or assembling the needle bar.
Adjustment Procedures Results of Improper Adjustment

−16 −
1) Adjusting the needle and the needle guide claw
2) Adjusting the thread tension of the needle guide claw
(5) Adjusting the needle guide claw
Setscrew A
Needle guide claws
Slide block Needle
guide claws
Needle
a
bb
Slide case
Slide block
Needle guide
claw 1Needle guide
claw 2
Slide block
Slide case
Setscrew ALever
Bracket
P
1
2
Standard Adjustment