Adjusting The Needle Thread Clamping Arm; Adjusting The Draw-Out Amount Of The Looper Thread - JUKI MH-481 Manuel D'utilisation

28. ADJUSTING THE NEEDLE THREAD CLAMPING ARM (MH-481-4, MH-481-5, MH-484-4,
MH-484-5)
WARNING :
To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be
sure that the motor has totally stopped rotating in prior.
Tension guage
29. ADJUSTING THE DRAW-OUT AMOUNT OF THE LOOPER THREAD (MH-481-4, MH-481-5,
MH-484-4, MH-484-5)
WARNING :
To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be
sure that the motor has totally stopped rotating in prior.
1
The standard amount of looper thread is drawn out when looper thread draw-out lever 1 is spaced 3 mm from
the thread path hole in cam thread guide 2 immediately before the thread trimmer is actuated. Loosen nut 3 and
make adjustment by moving cam thread tension release slide block 4 to the right or left.
For certain types of needle, the looper thread may slip off the looper. In such a case, make adjustment so that a
longer thread is drawn out.
Needle thread clamping arm
3
2
– 25 –
The function of the needle thread clamping arm is to
clamp the needle thread which was handled by the wip-
er in order to prepare for the following sewing works.
Adjust the tension of the spring so that the clamping
pressure is in a range of 30 to 40 g when the cotton
needle thread No. 60 is being pulled out. This pressure
is common to all kinds of sewing threads. Therefore,
you do not need to change the aforementioned pressure
every time after a thread is replaced.
* Adjust it with care not to apply uneven pressure to
the spring.
Looper thread
4