Adjusting The Thread Hook - JUKI MF-7900 Series Engineer's Manual

(10) Adjusting the thread hook

WARNING :
As the work is performed while the power is ON, never touch the switches other than the necessary
one so as to prevent accidents caused by the malfunction of switches.
B
❶
❺
❼
❽
Loosen setscrews ❶ .
1.
Shift the air cylinder base (general asm.) ❷ in direction A. Temporarily tighten setscrews ❶ .
2.
* When sliding the air cylinder base (general asm.) ❷ in the direction A, the thread hook ❻ moves to
the direction C.
When sliding the air cylinder base (general asm.) ❷ in the direction B, the thread hook ❻ moves to
the direction D.
In this state, fix the switch ❸ of topmost solenoid valve with the ON state.
3.
Turn the handwheel to align the tip of left needle ❹ with the center of looper ❺ .
4.
Temporarily tighten setscrews ❼ and ❽ . Adjust the clearance provided between the left needle ❹
5.
and the thread hook ❻ to 0 to 0.05 mm when the left needle ❹ and the top end of thread hook ❻ are
aligned in lateral direction. Then, tighten setscrew ❼ and setscrew ❽ in the written order.
* If setscrew ❽ is tightened first, the thread hook ❻ will be likely to turn clockwise, making the correct
positioning of the thread hook difficult.
(Caution) Carry out adjustment with thread hook ❻ shifted to the right by its backlash.
❷
A
When the needle moves in
the descending direction.
❹
1/2
– 167 –
❸
❹
0 to 0.05 mm
(Clearance)
C
❺
❻
D