Mitsubishi Electric LU2-4652-B1T User manual

A180E557P02
INSTRUCTION MANUAL
SINGLE-NEEDLE LOCKSTITCH COMPOUND-FEED
AUTOMATIC UNDERTRIMMER
INDUSTRIAL SEWING MACHINES
LU2-4652-B1T
MODEL

PRECAUTION BEFORE STARTING OPERATION
1 Safety Precautions
  

  󱐯

  󱐯

  

  

  

2 Precaution before Starting Operation
  

  

  

 
  
3 Precaution for Operating Conditions
  

  
  

INTRODUCTION





CONTENTS
PREPARATION FOR OPERATION  
1  
2  
3  
4  
5 
6 
USAGE PRECAUTION  
1     
2     
3 
4  
5  
6  
7  
HOW TO USE  
1  
2 
3 
4 
5 
6 
7  
8 
9 
:  
A 
B 
C  
D  
E  
F 
G  
H 
I 
J
  
K  
L 
M  
N  
O  
P 
Q 
R  
S 
T
  
U  
SPECIFICATIONS  

1 Installing the air cylinder assembly
   

 
   
 
2 Connecting the electric cables to the control box

   󰴤

   󰴥󰴦
   󰴥   
 󰴧  󰴧
󰴦 󰴧  
   󰴨󰴧

   󰴩  󱠄  
󰴪
   󰴫
󰴪
   󰴬
󰴭
Drivinglink
Nylon
washer
Bracket
Backofthearm
Bolt
Aircylinderassembly
Pin
PREPARATION FOR OPERATION
—1 —

   󰴮
󰴰
 󰴯

   󰴤


⑥④Bport ⑬Bport
⑬Aport
④Aport
⑦Aport
INporttotheair
supplysource
Kneeswitch
LF-FM-CFT
(Option)
①
Urethanetube
OPTIONBOPTIONAF・L S.M
⑪
⑫
②
③
⑤
⑨
⑩
⑧
Aircylinderassembly
PREPARATION FOR OPERATION
—2 —

3 Adjustment of the stitch length before trimming






   
   
 

   

















A
Shaft
Nut
Knuckle
PREPARATION FOR OPERATION
—3 —

4 Operation speed adjustment of instant alternating air cylinder
   󰴤


   󰴥


5 Height adjustment of the automatic
presser foot lifter


   
   

①
②
Stopper
Backofthearm
PREPARATION FOR OPERATION
—4 —

PREPARATION FOR OPERATION
6 Adjustment of the needle stopping position
1 . Adjustment of “UP” position


  
  
   󱠄
2 . Adjustment of “Down” position


  
  
   󱠅
3 . 

Timingmark
Whitemark
Blackmark
Upposition
Downposition
Adjustingtool
UP
later
earlier
DOWN Timingoftheneedle
Ⓐ
Ⓑ
—5 —

1 Lubrication ( 1 )





  
   
USAGE PRECAUTION
Oillevelmark
2 Lubrication ( 2 )





—6 —

5 Precaution for the built-in type detector
  

 󱐯

  󱐯
󱐯

󱐯󱐯

 
6 Installation of the belt cover
  

  
7 Precaution on operation
   󱐯
   

   

   

3 Lubrication condition


4 Adjustment of lubrication to the
rotating hook
USAGE PRECAUTION
Oilsightwindow
Adjustingscrew
IncreaseDecrease
Nut
—7 —

1 Installation of the needle
Note: Before installing the needles, be sure to turn o󱐯 the power.
HOW TO USE
Longgroove
leftside
2 Winding of the bobbin thread
Note: When bobbin thread is wound, keep the presser foot lifted.
Adjustment ●Tension of wound thread 

●Conically wound thread 

●Amount of wound thread 


Windingtension
adjustmentnut
Evenwinding
amountof80%
offullcapacity
Windingamount
adjustmentscrew
Threadguide
—8 —

HOW TO USE
①
Threadtension
releasingbutton
③
②
④
⑤
⑥
⑦
⑧
⑩
⑪
⑫
⑬
⑭
⑨
3 Selection of the thread






4 Threading of the needle thread
  
 

 
  

 


Stwistthread
Ztwistthread
A B A AB
—9 —

5 Adjustment of feed (stitch)
length and backstitch




󱐯
 







6 Setting of the bobbin
   
   

7 Adjustment of the needle
thread guide







  
   



  
HOW TO USE
Touchbackswitch
Feedlengthsettingdial
Reversesewinglever
Bedslide
Hook
Bedslide
Thread
—10 —

8 Threading of the bobbin thread
   󰴤
󰴥
   






9
Adjustment of the bobbin thread tension
: Balance of threads tension
A
Adjustment of the needle thread tension


Pre-tensionnut
Tighten
Loosen
Tighten
Loosen
Threadtensionnut
B
Adjustment of the presser foot pressure


Weaken Strengthen
HOW TO USE
Thread
①
② Opener
Loosen Tighten
Threadtensionscrew
A○
B×
C×
Balancedtension
Tighttheneedlethreadtensionor
loosethebobbinthreadtension
Loosetheneedlethreadtensionor
tightthebobbinthreadtension
—11 —

C
Adjustment of the outside presser
foot and inside presser foot
1 . Adjustment of alternating movement
   



   


   




   

2 .
To change the balance of the alternating movements
between the outside presser foot and inside presser foot
   


󰴤

󰴥

󰴦󱠄

󰴧

󱠄
󰴨




      


 

󱠄
󱠄
 

Rubber
plug
Matchingmark
Alternatingstrokeadjustingdial
Inside
presserfoot
Outside
presser
foot
2.0to6.0mm
Feedliftingrock
shaftcrank(right)
Rubberplug
Ⓐ
SecondscrewⒶ
Firstscrew
Uppereccentricfeedliftingcam
HOW TO USE
3 . How to install the upper eccentric feed lifting cam
   


   

󱠄

—12 —

D Instant alternating switch




 








 







 



E The stopper screw for adjusting
the maximum alternating stroke









 

 
 

 
Stopperscrew
Nut
Instantalternatingswitch
Alternatingstrokeadjustingdial
Stopperscrew
Specialscrew
Nut
Redmark
(positionat6mm)
HOW TO USE
—13 —

F
Installing the feed regulator bracket







   󱠄




   
   

󱠅


󱠆
G Adjustment of the alternating
stroke sensing potentiometer




   󱐯
   

   


   


   󱠇

 

   
󱠄

 

   

Feedliftingrock
shaftcrank(right)
Feedregulatorshaft
Feedregulatorbracket
42.6mm
2.3mm
Ⓑ
Ⓐ
Ⓒ
Potentiometer
42.6mm
Ⓓ
Ⓐ
HOW TO USE
   󱠇

   

󱐯

 󱐯
 


 
—14 —

H Timing between the rotating
hook motion and the needle
motion



   
   󱠄 󱠅 󱠆
 

   


   


   󱠄 󱠅
 󱠅
   

󱠆
 


   

   



HOW TO USE
Tipof
thehook
0.05mmorlower
0.05mm
（a）Positionoftheneedlebar:
Thelowestposition
（b）Positionoftheneedlebar:
2.4mmliftedpositionfrom(a)
ScrewⒶ
ScrewⒷ
ScrewⒸ
—15 —

I
Adjustment of the feed dog height


 


 


 

Adjustment of the feed dog height
   
   


   
   


   
The feed dog height is factory-adjusted to 1.0 mm.
HOW TO USE
Throatplate
Feeddog
1.0mm
Feedbar
screw
Feedbar
—16 —

J
Relationship between the rotating
hook motion and the thread take-up
lever motion




   

   



   


K
Relationship between the rotating
hook motion and the opener motion
   


   󱠄

   
󱠅

HOW TO USE
Timingbeltpulley
Timingmark(arrow)
Blacklineonbossoflowershaftbearing
Timingbelt
Approx.0.2mm
Opener Openerholder
ⒶScrewⒷ
—17 —