Page 1
ENGLISH
MB-1373,1377
INSTRUCTION MANUAL
Page 2
CONTENTS
1. SPECIFICATIONS ........................................................................................................... 1
2. PREPARATION OF THE SEWING MACHINE
2-1. Installation ..........................................................................................................................................1
2-2. Lubrication ..........................................................................................................................................2
2-3. Attaching the needle ..........................................................................................................................2
2-4. Attaching the needle bar cover ......................................................................................................... 3
2-5. Attaching the button tray assembly .................................................................................................3
2-6. Threading the machine ...................................................................................................................... 3
................................................................ 1
3. ADJUSTMENT OF THE SAWING MACHINE ................................................................. 4
3-1.
Thread tension adjustment........................................................................................................................ 4
3-2.
Adjustment of the thread pull-off lever .................................................................................................... 4
3-3. Adjusting the tension lever ...............................................................................................................4
3-4. Adjusting the nipper ..........................................................................................................................5
3-5. Adjusting the thread tension guide on the face plate ..................................................................... 5
3-6.
Needle-to-looper relation .................................................................................................................................... 5
3-7. Position of the needle guide .............................................................................................................6
3-8. Height of the button clamp ................................................................................................................6
3-9. Work pressing force ..........................................................................................................................6
3-10.
Adjustment of the button clamp stop lever .....................................................................................6
3-11. Timing of thread tension release .................................................................................................... 7
3-12. Setting for 2- or 4-hole buttons .......................................................................................................7
3-13. Setting a number of stitches ........................................................................................................... 8
3-14. Adjusting the position of the stop-motion ..................................................................................... 8
3-15. Adjusting the position of the moving knife ...................................................................................9
3-16. Clearance between the button clamp lifting lever and the adjusting screw ..............................9
3-17. How to set the L-shaped lifting rod ................................................................................................ 9
3-18. Knot-tying mechanisms ................................................................................................................10
(1) Adjusting the knot-tying connecting plate
(2) Adjusting the knot-tying arm stopper ............................................................................................10
(3) Adjusting the knot-tying notch ......................................................................................................10
(4) Changeover of with/without knot-tying ......................................................................................... 11
3-19. Adjusting the thread tension controller No. 3
(1) Assembly procedure
(2) Adjustment ...................................................................................................................................12
....................................................................................................................12
.....................................................................................10
............................................................................. 12
4. MAINTENANCE, SUBCLASS MODELS AND ATTACHMENTS .................................. 13
4-1. How to connect the metal ttings of the belt ................................................................................13
4-2. Subclass models ............................................................................................................................. 13
4-3. Attachments ......................................................................................................................................14
(1) Attachments for shank buttons (Pearl buttons) (Z033)
(2) Attachment for the rst process of wrapped-around buttons (Z041) ............................................15
(3) Attachment for the second process of wrapped-around buttons (Z035) ......................................16
(4) Attachment for snaps (Z037) ........................................................................................................16
(5) Attachment for metal buttons (Z038) ............................................................................................17
4-4. Motor pulley and belt
....................................................................................................................... 17
................................................................15
5. TROUBLES AND CORRECTIVE MEASURES ............................................................. 18
Page 3
1. SPECIFICATIONS
MB-1373 MB-1377
Sewing speed
Number of stitches 8, 16 and 32 stitches
Feed amount Lateral feed 2.5 to 6.5mm
Longitudinal feed 0, 2.5 to 6.5mm
Button size
Needle used
Lubricating oil
Noise
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 84 dB; (Includes KpA = 2.5 dB); according to ISO 10821-
C.6.3 -ISO 11204 GR2 at 1,300 sti/min.
Normal 1,300 sti/min (Max. 1,500 sti/min)
Longitudinal feed 0, 2.5 to 4.5mm
10 to 28 mm
TQx1 #16 (#14 to #20) TQx7 #16 (#14 to #20)
JUKI New Defrix Oil No. 1
2. PREPARATION OF THE SEWING MACHINE
2-1. Installation
Put rubber cushion 1 on the table,
2
5
6
7
place the machine head on the rubber
cushion and x it to the table using
screws 2, plain washers 3 and nuts
4
7
Lateral feed 2.5 to 6.5mm
. Attach “S” chain hook 6 and chain
to stop motion trip lever 5.
3
4
1
– 1 –
Page 4
2-2. Lubrication
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
2
!3
4
3
!2
6
!4
5
7
!5
8
!0
9
!6
!1
1) Open the side cover, and apply JUKI New Defrix Oil No. 1 to the
portions shown by the red marks 1 to !3 (8 : MB-1377 only).
(Apply approximately 1 cc of oil to the respective lubricating
places one to two times a week.)
2) Loosen connecting screw !4, tilt the machine head backward
and apply grease (JUKI designated grease) to crossed helical
gear !6 and worm gear !7.
3) Check, approximately once a week, that oil amount is sufcient
to reach the top of the oil felt placed inside the bed mounting
base. If the amount of oil is insufcient, add an adequate amount
of oil. At this time, also apply oil to crank rod !5.
2
[Caution at the time of lubricating]
Take care not to allow speed slowing friction
1.
wheel 1 and friction plate 2 to be clogged with
1
oil to prevent them from the deterioration of
retardation performance. In addition, when the
components are clogged with oil, wipe the oil
from them.
2.
Take care not to allow the machine belt to
be clogged with oil to prevent it from the
deterioration.
!7
2-3. Attaching the needle
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
1
Use a standard needle of TQx1 #16.
★
Loosen setscrew 1 and hold needle 2 with the long
groove facing toward you. Then fully insert it into the
hole in the needle bar, and tighten setscrew 1.
– 2 –
Page 5
2-4. Attaching the needle bar cover
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
4
3
2
1
2-5. Attaching the button tray assembly
1
1) Loosen screw 2 and remove thread guide 3.
Place needle bar guard 1 under thread guide
2)
and attach thread guide 3 so that lever 4
3
comes to the center of it at the start of the ma-
chine.
3) Fix the cover with screw 2.
Insert the posts of button tray 1 in hole on the right
of the machine sub-base and tighten each setscrew
. If it is difcult for the operator to pick up the but-
2
tons on the right side, change it to hole 3 on the left
side.
3
2
2-6. Threading the machine
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
!4
A
!6
!7
!8
@0
@1
!5
!9
!3
!1
!2
!0
9
8
7
5
4 3
6
2
1
Thread the machine head in the order of 1 to @1 as shown in the illustration given above. Then, pass the
thread through the needle eye from the front for approximately 60 to 70 mm as you depress nipper releasing
knurled thumb nut A.
* Standard needle is TQ X 1 #16.
– 3 –
Page 6
3. ADJUSTMENT OF THE SAWING MACHINE
3-1.
Thread tension adjustment
2
3-2.
Adjustment of the thread pull-off lever
1
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
3
2
Tension post No. 1 1 is used to adjust the thread
tension to sew on the button and a relatively low
tension will be enough. Tension post No. 2 2 is
used to adjust the thread tension applied to the root
of the button sewing stitches. This tension must be
determined according to the type of thread, fabric
and thickness of the button and must be higher than
that of tension post No. 1 1. Turn the tension nuts
clockwise to increase or counterclockwise to reduce
the thread tension.
A
At the time of X
stitching
B
To adjust the thread pull-off lever 1, insert a screwdriver through an opening in the machine arm side cover
(left), loosen screw 2 and adjust the position of nipper bar block (rear) 3 to the left or the right. If the end of
thread is drawn from arrow hole A in the button after sewing, change the position of nipper bar block (rear) 3
to the left. Move the lever to the right when the thread end comes out from arrow hole B.
3-3. Adjusting the tension lever
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1) When the machine is in the stop-motion state,
loosen screw 1.
2) Tighten setscrew 1 so that there is a clearance
of 8 to 10 mm as a standard between the end of
thread tension guide 3 and end of lever 4.
After the adjustment, make sure that the
thread path is within the slot as illustrated in
Fig. A when the machine starts.
If the thread paths do not coincide with each
other, loosen screw 2 in the tension thread
guide and adjust it properly.
2
8 to 10 mm
A
3
1
4
– 4 –
Page 7
3-4. Adjusting the nipper
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1) Provide a 0.4 to 0.6 mm clearance
1
4
0.4 to 0.6 mm
2
3
between nipper block 2 and nipper
1
ing the thread while the machine is in
operation.
2) Loosen screw 3 and move nipper bar
block 4 to the right or the left.
3-5. Adjusting the thread tension guide on the face plate
If the formation of seams at the start of sewing is
failed and the seams are formed on the way even
1
when the thread pull-off lever is adjusted, turn thumb
nut 1 (double nut) to decrease the thread tension.
to prevent the nipper 1 from hold-
3-6.
Needle-to-looper relation
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
3
TQx1
1
2
Adjust the needle-to-looper relation as follows :
★
1) Depress the pedal fully forward, turn the needle driving pulley in the normal sewing direction by hand to
bring down the needle bar to the lowest position of its stroke and loosen screw 1.
(Adjusting the needle bar height)
2) Adjust the height of the needle bar using the top
two lines engraved on the needle bar
TQx1 needle and using the bottom two lines for
the TQx7 needle. Align the upper line A with the
bottom end face of needle bar bushing (lower)
and tighten screw 1. At this time, tighten the
3
screw so that groove C of the needle faces the
front.
TQx7
2
A
2
2
for the
6
B
C
4
5
(Looper position)
3) Loosen screws 4 and turn by hand the needle driving pulley until lower line B of two lines aligns with
the bottom end face of needle bar bushing (lower) 3.
4) By keeping the machine in this state, align looper blade
with the center of the needle and tighten screws 4.
5
5) Loosen screws 6 and provide a 0.01 to 0.1 mm
clearance between the looper and the needle.
Tighten screws 6.
– 5 –
Page 8
3-7. Position of the needle guide
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
0.05 to 0.1 mm
1
3-8. Height of the button clamp
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
4
3
1
A
2
Loosen screw 2 and provide a 0.05 to 0.1 mm clear-
ance between the needle guide 1 and the needle
by moving the needle guide 1 to the left or the right
when the needle is in the lowest position.
1) The standard clearance A between the rear side
of the bottom face of button clamp jaw lever 1
and the top surface of feed plate 2 is 8 mm at
the position where the machine has stopped after
sewing.
2) To adjust the height of the button clamp unit,
loosen screw 3 in the button clamp lifting hook
and move button clamp lifting hook 4 up or
down.
3-9. Work pressing force
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
2
3-10.
Adjustment of the button clamp stop lever
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
28.5 to
29.5 mm
2
The standard work pressing force is by providing a
28.5 to 29.5 mm between the top end of nut 1 and
the bottom end of pressure adjusting bar 2.
Turn nut 1 to adjust it.
When clamp screw 1 is loosened in the state of
stop-motion, button clamp jaw levers 3 opens/closes with button clamp stop lever 2. Set a button to
the correct position and x button clamp stop lever
at the position where taking in and out of the but-
2
ton is easily performed with clamp screw 1.
3
– 6 –
Page 9
3-11. Timing of thread tension release
Turn the needle driving pulley as you draw the thread in the direc-
B
tion of arrow mark A and you will nd a point at which the tension
discs on the tension post No. 2 release the thread. At this moment,
the standard distance from the top end of the needle bar bushing
(upper) to the top end of the needle bar is 44 to 47 mm (in case of
A
the needle of TQ X 7, 54 to 57 mm).
Perform the following adjustments especially when the undermentioned troubles occur frequently.
1
Loosen nut 1, insert the blade of a screwdriver to the top slot of
the tension post No. 2 and turn it in the direction of arrow mark B
to lower the height of the thread oating bar and in the opposite
direction to raise the height.
Phenomenon Height of thread oating bar
1.When the stitch made on the wrong side of the
workpiece is too loose ;
2.When the thread is broken at the time of stop-motion ; Make the needle bar slightly lower.
3.When the thread is broken frequently ; Make the needle bar slightly lower.
Make the needle bar slightly higher.
3-12. Setting for 2- or 4-hole buttons
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
MB-1377
1
B C A
[In case of MB-1373]
Lengthwise feed
★
Push down lengthwise feed
adjusting lever 1 and set it to
“0” for 2-hole buttons or a corresponding amount for 4-hole
buttons.
Crosswise feed
★
Loosen nut 2 and set section A of pointer 3 to a
corresponding amount. Then
tighten nut 2.
Perform the adjustment after
confir m i n g th at th e sewing
2
3
m a ch in e is lo c a t ed at th e
position of the stop-motion (refer
to "3-14. Adjusting the position
of the stop-motion", p.8).
Measure the distance between two
holes in a button and set equally cross-
A
wise and lengthwise feed regulators for
4-hole buttons.
[In case of MB-1377]
Lengthwise feed
★
Push down lengthwise feed adjusting lever 1 and set it to "0" for -2-hole
buttons or a corresponding amount for 4-hole buttons by the respective
procedures below according to the sewing methods.
X stitch : Set the lengthwise feed adjusting lever to the position corre-
sponding to the amount for the button within the range of A.
U-sharp stitch : Set the lengthwise feed adjusting lever to the position cor-
responding to the amount for button within the range of B.
When setting the lengthwise feed adjusting lever to the position of
C (outside of range of setting the lever), not only the sewing cannot
be performed but also trouble will be caused. Do not set the feed
adjusting lever at the position of C.
Crosswise feed
★
Loosen nut 2 and set section A of pointer 3 to a corresponding amount.
Then tighten nut 2.
Before operating the machine, ensure that the needle enters the
center of each hole in the button.
– 7 –
Page 10
3-13. Setting a number of stitches
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
To change the number of stitches, open the left-hand side cover and change the number of stitches using
stitch number adjusting screw 1 and stitch number adjusting lever 4 (optional).
How to adjust 16 stitches
How to adjust 8 stitches
★★
★
1
To make 8 stitches, loosen stitch number adjusting
screw 1 and x it to the position as shown in the
illustration.
How to adjust 32 stitches
★
4
When stitch number adjusting screw 1 being set for
"8 stitches" has arrived at the left end, loosen stitch
number adjusting screw 1 and x it to the position
as shown in the illustration.
In the state of 16 stitches, stitch number adjusting
gear roller 2 which is attached to the large gear 5
comes to the lower side, assemble stitch number
3
5
2
adjusting lever 4 (supplied as accessories) using
hinge screw 3 (supplied as accessories).
3-14. Adjusting the position of the stop-motion
Adjust so that claw 1 of the stop-motion cam comes
2
1
in contact with stop-motion hook 2 when the sewing
machine completes the sewing and stops.
1
Wh e n re pl a c in g th e mo tor pu l le y an d
changing the sewing speed from 1,300 sti/
min to 1,500 sti/min, and vice versa, be sure
to re-adjust the position of the stop-motion.
3
4
[Adjusting procedure]
• When the stop-motion hook comes in
contact with the stop-motion cam and
rebounds, (When there is a clearance
A
B
between claw 1 and stop-motion hook 2)
loosen two stop-motion position adjusting
screws 3, turn stop-motion adjusting cam 4
in the direction of A, and x stop-motion position adjusting screws 3.
• When the stop-motion hook stops before it
comes in contact with the stop-motion cam claw
Loosen two stop-motion position adjusting
screws 3, turn stop-motion adjusting cam 4
in the direction of B, and x stop-motion position adjusting screws 3.
– 8 –
Page 11
3-15. Adjusting the position of the moving knife
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Adjust the position of the moving knife by means of
thread trimming gauge 1 that comes with the unit as
an accessory.
When the presser has completely lifted at the stopmotion position (refer to
tion of the stop-motion", p.8
that the clearance between thread trimming connecting plate (front) 2 and the end face of the slit of
throat plate 3 is 10 to 11 mm.
Tilt the sewing machine. Remove the oil shield of
the bed. Loosen two nuts 4. Adjust the position of
the moving knife by moving connecting screw 5
back and forth using the gauge you have inserted
as a guide. When you loosen nuts 4, try to position
thread trimmer connecting joint 6 so that it is nearly
leveled.
2
10 to 11 mm
6
5
3
1
4
"3-14. Adjusting the posi-
), it is the standard
If the moving knife is not correct (the distance between 2 and 3 is too short),
10.5mm
11.5mm
the yoke slide may interfere with the thread separating claw. In this case,
adjust the clearance provided between thread trimmer connecting plate (front)
and the end face of the slot in throat plate 3 to 11 to 12 mm using the "11.5
2
mm" side of gauge 1.
In the case the position of the moving knife is not correct (the distance between 2 and 3 is too long), thread may remain on the wrong side of material.
To prevent this, adjust the aforementioned clearance to 10 to 11 mm using the
"10.5 mm" side of the gauge.
3-16. Clearance between the button clamp lifting lever and the adjusting screw
Provide a 0.5 mm clearance between the end face of
button clamp lifting lever 1 and adjusting screw 2
0.5 mm
at the stop-motion position (refer to
the position of the stop-motion", p.8
"3-14 Adjusting
) and tighten
with adjusting screw nut 3.
2
3
1
3-17. How to set the L-shaped lifting rod
6
4
3
5
2
1
Put moving knife push-back spring 2, stop-motion
rubber cushion washer 3, stop-motion rubber cushion 4 and stop-motion rubber cushion washer 5, in
this order, to L-shaped lifting rod 1. Make the jaw
of the machine arm come into close contact with the
end face of the stop-motion rubber cushion washer
at the stop-motion position (refer to
the position of the stop-motion", p.8
"3-14 Adjusting
) and set the
L-shaped lifting rod without a play. Then tighten it
with screw 6.
– 9 –
Page 12
3-18. Knot-tying mechanisms
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
(1) Adjusting the knot-tying connecting plate
2
3
1
Loosen screws 1 and adjust so that a clearance of
1 to 1.5 mm is provided between the needle 2 and
the knot tying plate 3 when the roller of the knot-
tying arm gets on the outmost periphery of the knot-
tying notch.
After the adjustment, ascertain that the needle
does not come in contact with the knot-tying
plate.
1 to 1.5 mm
(2) Adjusting the knot-tying arm stopper
1
2
3
4
(3) Adjusting the knot-tying notch
30 to 35 mm
1
When starting the sewing machine and the roller of
knot-tying arm does not come into contact with the
knot-tying notch, loosen screws 3 and adjust with
stopper 4 so that outside periphery 1 of the needle
hole almost aligns with top end 2 of the knot-tying
plate.
Loosen screws 1 and adjust so that the roller of the
knot-tying arm comes in contact with the knot-tying
notch when the needle bar goes up at the fourteenth
stitch as high as 30 to 35 mm (40 to 45 mm when a
TQ x 7 needle is used) above the needle bar upper
bushing.
– 10 –
If two knot-tying notches are to be installed
(w it h o u t cr o s so ve r st i t ch ) , ma k e the
aforementioned adjustment at the 6th and
14th stitches.
Page 13
(4) Changeover of with/without knot-tying
1
To make “with knot-tying”, pull knot-tying changeover
knob 1 toward the front and place it to the position
in the gure.
To make “without knot-tying”, pull knot-tying change-
over knob 1 toward the front and place it to the
position in the gure.
1
– 11 –
Page 14
3-19. Adjusting the thread tension controller No. 3
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Depending on the product to be sewn, the needle
can pierce the thread of the previous stitch when it
enters the same point twice during sewing (8th, 16th,
24th and 32nd stitches). This results in thread trimming failure and thread breakage. (When the needle
enters the same needle entry point as the previous
stitch, the button clamp does not move. As a result,
the thread is likely to slacken and the needle pierces
the slackened part of the thread.)
If the phenomenon where the thread gets hung up on
the looper and does not leave there frequently occurs,
use the thread tension controller No.3 (asm.) (part
Thread
(1) Assembly procedure
Looper
number: 40112426) for the thread take-up spring.
In addition, the aforementioned trouble
can be prevented more effectively by the
use of a ball-point needle instead of the
current one.
1
2
4
5
3
(2) Adjustment
After the completion of assembly, check the following:
× : The state where the thread is slackened
Put the top end of thread take-up spring 1
into the hole in the thread take-up spring
base 2.
Remove screw 4 from tension control-
ler No. 3 mounting plate 3. Then, tighten
thread tension controller No.3 (asm.) 5 for
the thread take-up spring with that screw.
1)
Check the thread take-up amount
Turn the handwheel by hand to carry out sewing.
Adjust so that the thread is not slackened at the
moment when the needle penetrates the material.
Adjust by moving the spring to the left position
counterclockwise that the thread is not slacked.
If you turn the spring counterclockwise exces-
sively, the thread take-up amount will be excessively increased, resulting in slip-off of the thread
from the needle eyelet.
:
○
The state where the thread is tensed
– 12 –
1. The thread is not tensed unless the
thread loop has been formed. Be sure
to check how the thread is tensed at
the 2nd stitch or later.
2.
At the time of adjust-
ment, this hole is
used as a guide to
determine the bestsuited position.
Page 15
2) Adjust the pressure of the thread tension control-
ler.
To allow the thread take-up spring to take effect,
adjust so that the pressure of the thread tension
controller plate is slightly decreased.
At this time, adjust so that the pressure of the
tension controller No. 2 is slightly increased. This
will effectively prevent the needle from piercing
Slightly lower than the standard adjustment
Slightly higher than the standard adjustment
the thread of the previous stitch.
3) Correctly adjust the looper timing.
Thread loop may not be smoothly formed since the spring is adjusted so that the thread is not slackened
at the moment when the needle penetrates the material. Be sure to adjust the looper timing with accuracy
so as to operate the sewing machine smoothly.
If the looper timing is excessively advanced, the looper may fail to catch the loop smoothly.
4. MAINTENANCE, SUBCLASS MODELS AND ATTACHMENTS
4-1. How to connect the metal ttings of the belt
Tighten connecting screws 1 of the belt so that the
screws protrude approximately 1.5 to 2 mm from the
reverse side as the standard.
1. When assembling the belt to the pulley
1
1.5 to 2mm
4-2. Subclass models
and rotating the motor after closing the
side cover, confirm that the side cover
does not interfere with the metal tting of
the belt.
2. Ta ke ca r e not to al l o w the be l t to be
clogged with oil when assembling it.
MB-1373 MB-1373-11
8, 16, 32 stitches 8, 16, 32 stitches
– 13 –
Page 16
4-3. Attachments
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
5
2
4
1
3
1) In order to install the attachment on the machine,
you may have to remove button clamp mecha-
nism 1 or feed plate 2.
2) Detach the snap ring from button clamp installing
stud 3, and you will be able to remove button
clamp mechanism assembly 1. Remove screw
, and you can remove feed plate 2.
4
The only feature that makes the difference
between the attachment of MB-373NS and
that o f MB -377NS i s bu tton cl amp l ifting
hook 5.
Use Flat buttons Shank buttons
Large-size Medium-size General
MB-1373
MB-1377
Schematic
drawing
Remarks Button size :
Use Wrapped-around buttons Metal buttons
MB-1373
MB-1377
Schematic
drawing
Remarks
Z201 Z202 Z033 Z037
A
B
Button size :
A : 3 to 6.5 mm
B : ø20 to ø28 mm
First process Second process General
Z041 Z035 Z038 Z039 Z044
A
Thread shank height
A : 5.5 mm
A : 3 to 5 mm
B : ø12 to ø20 mm
A
B
Button diameter : Less than 16 mm
Shank size :
Thickness : 6 to 5 mm
Width : 3 to 2.5 mm
Stay button Labels
Common to
Z041
Snaps
Snap size :
A : 8 mm
Stitch width :
3 to 6.5 mm
– 14 –
Page 17
(1) Attachments for shank buttons (Pearl buttons) (Z033)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
(INSTALLATION)
Remove both the button clamp mechanism assembly and the feed plate from the machine and install
attachment 1 in place. Loosen screws 3 and adjust
button clamp bracket 4 to permit the needle to
come down in the middle of the needle slot in shank
button adaptor 2. Attach button clamp feed plate 5
using screws 7 in the way that it permits the needle
to come down in the middle of the needle slot in feed
plate 6. Insert the top end of button clamp stud 8
into an opening in the jaw of the machine arm and
fasten it by screw 9.
!4
!5
2
6
!6
!3
!8
8
9
!2
!9
!7
4
5
@0
!0
7
!1
1
3
(ADJUSTMENT AND OPERATION)
1) Loosen screw !2, let feed plate 6 recede 0.5 to 1.0 mm from the left end of button clamp jaw lever 2
and retighten screw !2.
2) Set a button in place, loosen screws !3 and !4 and align shank button holding clamp !5 with the center of
the button.
3) Shank button holding clamp !5 must give proper pressure to the button so that the button stays steadily
in position while being sewn. Loosen a setscrew in thrust collar !6 and rotate the thrust collar until shank
button holding clamp !5 provides proper pressure.
4) You may x button clamp block !7 in a convenient position for operation.
1. When you x the thrust collar, ensure that button clamp rotating shaft !8 does not play axially in its
bracket.
2. Adjust lifting hook @0 and stopper pin !1 so that L-shaped lifting rod roller !9 does not come in
contact with button clamp bracket 4.
(2) Attachment for the rst process of wrapped-around buttons (Z041)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
3
1
(INSTALLATION)
Attach wrapped-around button foot 1 to the ordinary
button clamp jaw levers using screw 2 and guide
pin screw 3.
Align foot 1 with the jaw levers so that they permit a
button to rest in the middle.
(ADJUSTMENT AND OPERATION)
Adjustment and operation are almost same as those
for the at buttons, but you must adjust the thread
pull-off lever to provide more amount of thread in
order to make the thread loose below the button for
thread shank formation. (refer to
the thread pull-off lever
", p.4
)
"3-2.3-2.
Adjustment of
– 15 –
Page 18
(3) Attachment for the second process of wrapped-around buttons (Z035)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
(Z035)
(INSTALLATION)
Remove the button clamp mechanism assembly, but-
ton clamp pressure adjusting bar and feed plate from
the machine and install attachment for the second
4
2
5
3
process of wrapped-around buttons 1. When you
install a Z035 attachment, you must remove also the
L-shaped lifting rod.
Insert moving knife push-back spring 3, washer
, cushion 5 and washer 4 in spring guide shaft
4
in this order. Make certain that the stop-motion
2
7
8
6
mechanism has completely engaged, and install the
attachment assembly in place in the way that cush-
ion 5 comes in close contact with the surface of the
1
machine arm without play.
(ADJUSTMENT AND OPERATION)
1) Loosen screw 6 and adjust the thread shank length by moving guide (large) 7 and guide (small) 8 in
line with the point of needle entry.
2) Set a button (tilt it slightly for easy insertion) and pass the thread as the arrow shows.
3) Set the lengthwise feed to “0”.
(4) Attachment for snaps (Z037)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
4
1
3
(INSTALLATION)
Remove the button clamp mechanism assembly
and the feed plate. Set both the crosswise feed and
lengthwise feed graduated plates to “4 mm”. Install
snap clamp feed plate 1 in the way that the needle
drops evenly at four corners of its square opening.
Install snap attachment assembly 2 on the machine,
place a snap on the snap clamp jaw levers and make
sure that the needle drops accurately in each hole in
the snap. If necessary. loosen hex head screws 3
and adjust the position accurately. Lastly, make sure
that the concave section on the bottom face of snap
clamp slide guide 4 accurately matches the convex
section on snap clamp feed plate 1.
– 16 –
Page 19
(5) Attachment for metal buttons (Z038)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
!4
!6
8
9
!7
4
!9
!8
(INSTALLATION)
Remove both the button clamp mechanism assem-
bly and the feed plate from the machine and install
attachment 1 in place. Loosen screws 3 and adjust
button clamp bracket 4 to permit the needle to
come down in the middle of the needle slot in metal
button adaptor 2. Attach button clamp feed plate 5
using screws 7 in the way that it permits the needle
to come down in the middle of the needle slot in feed
plate 6. Insert the top end of button clamp stud 8
into an opening in the jaw of the machine arm and
!2
2
6
!3
!1
!0
!5
5
1
3
7
fasten it by screw 9.
(ADJUSTMENT AND OPERATION)
1) Loosen screw !0, let feed plate 6 recede 1.0 to 1.5 mm from the left end of button clamp jaw lever 2
and retighten screw !0.
2) Set a button in place, loosen screws !1 and
and align metal button holding clamp !3 with the center of
!2
the button.
3) Metal button holding clamp !3 must give proper pressure to the button so that the button stays steadily
in position while being sewn. Loosen a setscrew in thrust collar !4 and rotate the thrust collar until metal
button holding clamp !3 provides proper pressure.
4) You may x button clamp block !5 in a convenient position for operation.
1. When you x the thrust collar, ensure that button clamp rotating shaft !6 does not play axially in its
bracket.
2. Adjust lifting hook !9 and stopper pin !8 so that L-shaped liting rod roller !7 does not come in
contact with button clamp bracket 4.
4-4. Motor pulley and belt
1) For this machine a single-phase or 3-phase 200 watts (1/4 HP) induction motor is used.
2) Use a V belt.
3) The sewing speed depends on the diameter of the motor pulley as listed below ;
Hz sti/min Motor pulley part No.
1,500 40038291 ø 76
50
1,300 40038298 ø 64.5
1,500 40038298 ø 64.5
60
1,300 40042229 ø 57
mm
The pulley of 50Hz and 1,300 sti/min is in common with that of 60Hz and 1,500 sti/min.
★
The rotating direction of motor is counterclockwise when viewed from the motor pulley side.
★
Be careful not to rotate in reverse direction.
When replacing the motor pulley and changing the sewing speed from 1,300 sti/min to 1,500 sti/min and
★
vice versa, be sure to re-adjust the position of the stop-motion. (Refer to
of the stop-motion", p.8
.)
"3-14. Adjusting the position
– 17 –
Page 20
5. TROUBLES AND CORRECTIVE MEASURES
TROUBLES CAUSES CORRECTIVE MEASURES
1. Thread breakage
2. The machine forms a
seam after it has run
for a while instead of
forming it from the start
of sewing.
3. Buttons are not sewn
tightly
4. The last back-tack stitch
is poorly tensed.
5. The rst stitch trails
relatively long thread
from the right side of the
button.
6. Thread trimming failure
in the state of stopmotion
The yoke slide does not move in the correct
1
way.
The tension lever has been improperly adjusted.™Properly adjust the tension lever.
2
The thread tension post No. 2 fails to release
3
the thread at correct timing.
Lifting amount of the button clamp jaw unit is
4
excessive.
The thread nipper catches the thread.
5
The nipper has been improperly adjusted.
(The clearance is too small.)
The needle does not enter the center of the
6
holes in the button.
The needle is too thick for the diameter of the
7
hole in the button.
The thread pull-off lever has been improperly
1
adjusted.
Tension of the thread tension guide on the
2
face plate is excessive.
The yoke slide does not move in the correct
1
way.
The thread tension post No. 2 fails to release
2
the thread at correct timing.
The thread tension post No. 2 does not give
3
sufcient tension.
The needle does not enter the center of the
4
holes in the button.
The work pressing force is too high or too low.
5
The tension lever has been improperly adjusted.™Properly adjust the tension lever.
1
Timing of the knot-tying plate is incorrect.
2
The nipper has been improperly adjusted.
3
(The clearance is too large.)
The thread pull-off lever does not work properly.
The thread tension post No. 2 fails to release
1
the thread at correct timing.
The needle hits the edge of the holes in the
2
button.
The thread nipper fails to press the thread.
3
Adjust the timing of forward, backward and
™
sideways of the yoke slide.
Make the thread release timing slightly earlier.
™
Adjust the lifting amount of the button clamp jaw
™
lever to 8 mm.
Adjust the position of the nipper bar block.
™
Adjust the button clamp jaw lever holder.
™
Replace the needle by a thinner one.
™
Adjust the thread tension guide on the face plate
™
so that it provides a lower tension.
Properly adjust the tension lever.
™
Adjust the timing of the motion of the yoke slide at
™
each end.
Make the thread release timing slightly later.
™
Tighten the tension nut of tension post No. 2.
™
Adjust the button clamp jaw lever holder.
™
Adjust the work pressing force properly.
™
Advance the timing of the knot-tying plate.
™
(Adjustment of the knot-tying notch)
Adjust the nipper with the nipper bar block.
™
Adjust the thread pull-off lever by the nipper bar
™
block (rear).
Make the thread release timing slightly later to
™
give more tension to the stitches.
Adjust the button clamp jaw lever holder.
™
Adjust the nipper bar block.
™
7. Thread trimming failure
8. The needle thread is
cut in two places on the
wrong side of the fabric.
9. Button trails too long
thread after thread
trimming.
10. Length of thread
remaining, after thread
trimming, on the wrong
side of the material
varies.
The work pressing force is too high.
4
The moving knife does not separate the
1
thread on the fabric with its separation nail.
The needle does not enter the center of the
2
holes in the button.
The last stitch skips.
3
The moving knife thread separation nail is too
4
high or too low.
The moving knife is set in wrong place.
1
The moving knife thread separation nail is too
2
high or too low.
Timing of the moving knife motion is wrong.
1
Lifting amount of the button clamp jaw unit is
2
excessive.
Position of the moving knife is not correct.
1
Lifting amount of the button clamp jaw unit is
2
excessive.
– 18 –
Adjust the work pressing force by the pressure
™
adjusting nut.
Adjust the position of the moving knife.
™
Adjust the button clamp jaw lever holders.
™
Adjust the looper.
™
Adjust the height of the moving knife thread
™
separation nail.
Adjust the position of the moving knife when the
™
machine is in the stop-motion state.
Adjust the height of the thread separation nail.
™
Adjust the position of the moving knife.
™
when the machine is in the stop-motion state.
Adjust the lifting amount of the button clamp jaw
™
lever to 8 mm.
Adjust the position of the moving knife when the
™
machine completes stop-motion. (10 to 11 mm)
Adjust the lifting amount of the button clamp jaw
™
lever to 8 mm.
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