JUKI DDL-9000A, Engineer'S Manual

Page: 55 / 113

– 51 –
[9000A-SS, A-DS, A-M ]
The distance is 0.5mm between the knife thread guide and the blade
tip of the counter knife .
In this case, the distance is 4mm between the needle center and the
blade tip of the counter knife .
The blade tip of the counter knife is located 0.6mm above the mounting
face.
[9000A-SH]
The distance is 6mm between the needle center and the blade tip of the
counter knife .
(Cautions) 1. The blade sharpness is changed when the blade
mounting angle is changed for the blade tip of the
counter knife . The sharpness becomes best when
the blade section of the counter knife coincides
exactly with that of the moving knife .
2. When the counter knife is adjusted or replaced,
examine the blade sharpness, without fail. Also
adjust the mounting angle of the counter knife .
Loosen two the counter knife setscrews and adjust the position of
the counter knife .
(Cautions) The window (hole section) of the knife thread guide
shall be adjusted so that the needle enters the center
of the hole section.
When the counter knife is adjusted
to the right:
o The bobbin and needle thread
drawing length becomes longer
than the standard by the distance
of knife movement and the length
of the needle thread remaining at
the needle tip becomes longer.
(There is a time lag in thread
trimming.)
When the counter knife is adjusted
to the left:
o The bobbin and needle thread
drawing length becomes shorter
than the standard by the distance
of knife movement and the length
of the needle thread remaining at
the needle tip becomes shorter.
(There is a time reduction in thread
trimming.)
Adjustment Procedure Results of Improper Adjustment