– 7 –
1. Turn the flywheel until the needle bar
comes to its lowest position,
and loosen the needle bar connecting setscrew
.
2. Determine the needle bar height.
Adjust the engraved marker line (marker line
A
for the DB needle
and marker line
C
for the DA needle) of the needle bar
to the
lower end of the needle bar lower metal
and tighten the needle
bar connecting setscrew
. (Be careful not to tighten the needle
bar connecting setscrew
too much.)
3. Determine the mounting position of the hook
.
Turn the three hook setscrews in the direction of flywheel forward
revolutions to raise the needle bar. In this direction, adjust the
engraved marker line (marker line
B
for the DB needle and marker
line
D
for the DA needle) to the lower end of the needle bar lower
metal
.
4. In this state, adjust the blade point
of the inner hook to the center
of the needle
so that a clearance of 0.04 to 0.1mm (goal value) is
secured between the needle
and the hook
. Since then, firmly
tighten the three hook setscrews.
(Cautions) 1. If this clearance is too small, the blade point of the
hook
may be damaged.
2. Too much clearance may give rise to stitch skipping.
<Information about the dry hook>
A dry hook (RP hook) is employed for the DDL-9000A-DS type.
For replacement, use the part numbers specified below.
The hook part numbers come in two types according to the specifications.
22890206 (without the needle guard)
22890404 (with the needle guard)
22890305 (22890206 with special surface treatment)
(Cautions) The dry hook (RP hook) tends to collect thread chips
and material dust. This can cause malfunction or
defective stitches. Periodic cleaning is required.
<Lubricated hook K: Available separately>
This is a hard blade point hook with a needle holder applicable to needle
size #9 (#65).
Where a thin needle has to be used for reasons of sewing processes,
this type of hook is applicable to the prevention of stitch skipping and
needle breakage.
Adjustment Procedure
Results of Improper Adjustment
About the needle bar
Specifications
Part No.
Needle shank
DDL-9000A-S
, A-DS
22886907
1.8mm
ø1.64
DDL-9000A-S
, A-DS
22887009
1.8mm
ø2.02
DDL-9000A-SH
40061767
2.3mm
ø2.04
Amount of
looper return
Summary of Contents for DDL-9000A
Page 14: ... 10 4 Feed locus and phase 1 Timing standard 2 Timing fast 3 Timing slow Standard Adjustment ...
Page 32: ... 28 8 Adjustment of the amount of feeding 4 Optional switch Standard Adjustment ...
Page 60: ... 56 11 Thread trimming unit 7 Replacement of the moving knife Standard Adjustment ...
Page 66: ... 62 11 Thread trimming unit 10 Adjustment of the drive arm stopper Standard Adjustment ...
Page 70: ... 66 12 Adjustment of the wiper DDL 9000A WB OB 2mm 1mm Standard Adjustment ...
Page 72: ... 68 13 Adjustment of feed lever pressure B A Feed lever Standard Adjustment ...
Page 112: ...MEMO ...
