JUKI LK-1900B series, Руководство инженера

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Adjustment procedures Results of Improper adjustment
1. If the dimensions of 0.3 x 8 mm are not secured, retouching is
required with the aid of an oil stone.
Dimension A
(mm)
Part No. Name of part Remarks
0.8 14103253 Inner hook presser A Conforming to Specifications F and M as standard
1.3 14103352 Inner hook presser B Conforming to Specifications S as standard
1.7 14103659 Inner hook presser C Conforming to Specifications H as standard
1.9 B1817210DAD Inner hook presser D Optional
Adjustment procedures Results of Improper adjustment
The standard stroke of thread take-up spring
❶
is 8 to 10 mm, and
the pressure at the start is 0.1 to 0.3N.
1) Adjusting the stroke
Loosen setscrew
❷ , and turn thread tension (asm.) ❸ .
Turning it clockwise will increase the moving amount and the
thread drawing amount will increase.
2) Adjusting the pressure
To change the pressure of the thread take-up spring
❶ , insert a
thin screwdriver into the slot of thread tension post
❹
while screw
❷ is tightened, and turn it. Turning it clockwise will increase the
pressure of the thread take-up spring
❶
. Turning it counterclock-
wise will decrease the pressure.
Example of the thread tension
When using the sewing machine for the first time, adjust the thread
tension referring to the table below.
Thread Material Needle thread
tension setting
Thread take-up spring moving amount
[Thread drawing amount]
Strength
Tetron thread #50 Wool 30 to 35 10 mm [13 mm] 0.1N
Spun thread #50 Wool 50 to 55 10 mm [13 mm] 0.2N
Spun thread #60
(Needle thread clamp OFF) T/C broad
30 to 35 8 to 10 mm [11 to 13 mm] 0.1N
Cotton thread #50 Denim 35 to 45 10 mm [13 mm] 0.1N
Cotton thread #20 Denim 35 to 45 8 to 10 mm [11 to 13 mm] 0.1N