JUKI MS-3580 Serie Manual De Instrucciones página 121

Trouble
4. Needle edge blunting 4-1) Needle entry
4-2) Rear needle guard
4-3) Contact with the rear
Cause (1)
1-A) Front/rear and right/left
2-A) Improper position of the
3-A) Too often contact
of the looper
− 49 −
Cause (2) Check and corrective measures
Refer to the standard adjustment values.
needle entry seems
to be awkward in
conjunction with the
needle hole of the
throat plate.
Clearance check between rear needle
guard and needle
front-to-rear direction
Refer to the standard adjustment values.
$- 6. Adjust the looper movement locus to
between the rear of make the contact level appropriate when
the lower looper and
the lower looper moves backward.
the needle tip
Refer to the standard adjustment values.