Specifications

11. Refer to Figure 2-44 and lift the connecting link off of the movable knife
assembly.
12. Check that the movable knife clears the UTC detection arm by physically moving
the knife under the UTC detection arm and back.
13. If the knife touches the arm, reshape the arm slightly until it clears then repeat
steps 9 through 12.
14. Re-attach the connecting link to the pin on the movable knife assembly.
Caution! When installing the covers, be sure not to pinch the UTC Assembly wires!
15. Re-attach the right side rotary hook cover, the needle plate, and the front bed
cover.
Sew Test
We now must actually embroider onto properly hooped material to prove the
adjustment is proper. A special design named UTCTEST comes on a disk with your
machine. Load the design into your EDS software or optional disk drive and send it
to the sewing peripheral.
The primary purpose of the UTC is to signal when the bobbin thread runs out or
breaks. The UTC has a mechanical arm that is bumped by the bobbin thread during
every stitch. When the sensor is not bumped for the number of consecutive stitches
that are set as "Bobbin Count," the machine stops, backs up, and beeps.
If the UTC is too close to the needle, it may not react reliably in detecting the
absence of bobbin thread. If the UTC is too far away from the needle, it may falsely
indicate that the machine is out of bobbin thread when it indeed has bobbin thread.
movable knife
UTC detection arm
connecting
link
lift connecting
link here
Figure 2 - 44
2 - 50 Head Section
EMC 10/4 Technical Manual Melco Embroidery Systems