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1) Adjustment of the presser pressure
1. Loosen the nut and turn the presser adjusting screw .
Turning in Direction
A
for strengthening
Turning in Direction
B
for weakening
2. Tighten the nut after adjustments.
* Standard value of the presser adjusting screw height
C
2) Adjustment of thread release changeover
1. When thread release changeover is adjusted, thread tension disc
floating can be cleared.
2. With the aid of the knee presser lifter and the AK unit, the thread
tension release function becomes effective when the presser
hardware is raised by more than 3.5mm. This causes the thread
tension disc to rise and no tension is exerted on the needle thread.
[Method of adjustment]
1. Remove the wiper unit. [OB Specifications excluded]
2. Remove the cap that is located behind the sewing machine.
Using a hexagonal wrench of 3mm, loosen the changeover screw
.
o Lowermost mounting: Thread tension release is possible with
the knee presser lifter. (Standard)
o Uppermost mounting: Thread tension release is impossible with
the knee presser lifter.
(Cautions) Even when thread tension release changeover is ON,
there is no problem because the thread tension release
function is available at the time of thread trimming.
o Adequate thread tension can be
maintained even when the knee
presser lifter is raised at the time
of heavy material processing and
sewing around the corner sec-
tions. Therefore, thread tension
error can be avoided.
Adjustment Procedure Results of Improper Adjustment
Specifications Height mm
C
DDL-9000B- S33 40 4
DDL-9000B-SH 28 60 6
DDL-9000B-MA 22 20 2
Presser
pressure N
Presser
pressure kg
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