Operation Manual

Operation
Operating manual 275 Version 01.0 - 01/2016 31
5.6.2 Adjusting the hook thread tension
Figure 12: Adjusting the hook thread tension
The braking spring (3) and tensioning spring (2) together
determine the hook thread tension. The braking spring (3) also
prevents the bobbin from running on when the thread is cut.
Correct setting
• The thread interlacing should be exactly in the middle of the
material being sewn ( Section 5.6 Thread tension,
page 28).
• If the loose thread end is held tightly, then the spool housing
should slowly lower through its own weight when the
bobbin (1) is full.
• The total value of the hook thread tension should be applied
50% respectively through the braking spring (3) and the
tensioning spring (2).
Risk of injury from moving parts.
Switch off the sewing machine before adjusting the
hook thread tension.
WARNING
②
③
(1) - Bobbin (2) - Tensioning spring
(3) - Braking spring
①