Melco EP 1 - Skipped Stitches and Needle Breaks

7-2
EP 1 Operation Manual Melco Embroidery Systems
Skipped stitches
Needle breaks
PROBLEM
POSSIBLE CAUSES
SOLUTIONS
Needles
Needle is bent or damaged
Replace needle
Incorrect needle for the thread
size being used
Replace with a compatible
needle
Needle is installed incorrectly
Install needle correctly (see
needle replacement section)
Needle depth
Needle bar lowest dead point is
incorrect
Adjust needle depth (refer to
the technical manual)
Rotary hook
Hook timing is incorrect
Adjust gap (refer to the
technical manual)
Hook point is dull
Replace hook
Upper/bobbin
tension
Bobbin thread does not feed
out smoothly
Replace the bobbin and/or
bobbin case
Upper thread does not feed out
smoothly
Adjust the upper tensions
Presser foot
A weak or broken presser foot
prevents the needle from
coming out of the fabric
smoothly
Replace or strengthen the
spring (refer to the technical
manual)
Thread
Thread twist is too tight
Use the appropriate thread or
consult the service department
for suggestions
Thread is too elastic to form an
adequate loop
Check spring
The check spring stroke is too
high
Adjust the check spring stroke
(refer to the technical manual)
The check spring tension is too
high
Decrease the tension
POSSIBLE CAUSES
SOLUTION
Needle is bent
Replace needle
Needle installation is incorrect
Install correctly (see needle replacement section)
Needle strikes the rotary hook
Adjust hook timing refer to the technical
manual)
Poor needle quality
Replace needle
Dull needle tip
Replace needle
Needle is too small for the fabric
Replace with compatible needle
Needle strikes the needle plate
Adjust position of the needle case (refer to the
technical manual)
Needle strikes the UTC
Reposition the UTC (refer to the technical
manual)