JUKI MB-1373, MB-1377 Instruction Manual
ENGLISH
MB-1373,1377
INSTRUCTION MANUAL
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
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 –
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 –
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 –
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 –
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