Specifications

The second part of checking under thread presser is to check if the bobbin thread is
in fact being held in place.
1. While the machine is still turned OFF, remove the font bed cover and disconnect
the connecting link from the movable knife drive arm by lifting it from the front
pin (see Figure 2-28.)
2. Pull the movable knife forward with a small hex wrench hooked behind it.
3. Leaving the bobbin case in the rotary hook, pull off some bobbin thread, and
drape it over the movable knife (see Figure 2-30).
4. With the bobbin thread draped over the movable knife from back to front,
gently hold the thread so there is some slack and then push the knife back until
the thread is cut. This cut should be clean, and should not be frayed.
If the thread is frayed you may need to replace the spring knife, movable knife, or
both.
5. The "top" thread should be loose and fall away, because it has no support. The
"bottom" thread should be held in place under the movable knife by the under
thread presser.
6. If the under thread presser does not provide the required action, replace it and
check using steps 2 to 4 again.
7. After you are satisfied with the under thread presser action, re-attach the
connecting link and front bed plate (see Figure 2-28).
Movable Knife
Home Position
The movable knife home position is where the knife stops under the spring knife
after completing a trim cycle. This position is shown in Figure 2-32. Notice that
when properly positioned, the part of the rear tip of the movable knife that slopes
away from the top surface is showing in front of the leading edge of the spring
knife.
To check that the movable knife is at home position, perform these steps:
1. If the front bed plate is not installed, install it now.
2. Turn the machine power ON.
WARNING! Keep clear of the moving parts that are exposed during the operation
of the next steps.
3. Set "home" when prompted to set home on the display.
2 - 38 Head Section
EMC 10/4 Technical Manual Melco Embroidery Systems