4
(4). Speed control unit Forward / Backward function & force adjustment :
Delivery condition the inside torsion spring “E” is in position „1“.
After the adjustment of the outside springs (chap.3) the inside torsion spring (E) can be adjusted additionally.
a). Machine with foot lifter:
For machines with foot lifter solenoid, the lower blade of the spring must be placed in position1.
This causes a clear position for pedal half heeling position for sewing foot lifting without thread trimming.
The thread trimming will follow with pedal full heeling.
In this position of the spring blade the pedal force forward is lower than in position 2.
Attention: The parameter 70 has to be set onto OFF for machines with foot lifter solenoid.
b). Machine without foot lifter:
For machines without foot lifter solenoid the spring blade can be brought from position 1 to position 2.
Push with a small screw driver through the hole (F) and the blade will jump from position 1 to position 2.
The pedal forward force is higher in position 2 than in position 1.
Attention:
1. For machines without foot lifter solenoid the parameter 70 has to be set onto ON, that the thread trimming
happens in half heeling position of the foot pedal.
2. The reverse positioning of the springs blade (E) from position 2 to 1 can only be made after opening of the
speed control unit housing from inside.
F
sprin
position 1
E
E
From the library of: Diamond Needle Corp
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