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6 6
Sewing
·Wear protective gears for safety. Operation without them may lead to physical injuries.
·Turn off the machine in the following situations.
If the operator mistakenly steps on the pedal with the plug in, the machine will start automatically and
can cause severe injuries.
- When inserting upper thread
Notice
- When replacing bobbin or needle
- When the machine not in use or the operator leaving the work place.
6-1. Sewing
1. Press ON button of power switch ①.
2. Lamp on the program unit ② turns on and machine is ready
to operate.
3. Control sewing conditions by using program unit ②.
(See user's manual of Fortuna IV.)
4. Step on the pedal to operate.
6-2. Adjusting thread tension
Sewing Type
1. Lower Thread Tension Adjustment
If you turn the tension adjustment screw① of hook
clockwise, the tension of lower thread would increase. If
your turn the screw counterclockwise, the tension would
decrease as shown in figure 32.
Cause
Good sewing in balance
Upper thread tension is too weak
Lower thread tension is too strong
Upper thread tension is too strong
Lower thread tension is too weak
②
Troubleshooting
Make upper thread tension strong or
make lower thread tension weak
Make upper thread tension weak or
make lower thread tension strong
Weak
Strong
①
[ Figure 31 ]
①
[ Figure 32 ]
25
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