Operation Manual

Operation
Operating manual 275 Version 01.0 - 01/201630
Pre-tensioner
The pre-tensioner (1) holds the thread in position while the main
tensioner is open when cutting the thread.
The pre-tensioner (1) also determines the length of the initial
thread for the new seam when the thread is cut:
Figure 11: Adjusting the needle thread tension: Pre-tensioner
In the basic position, the upper side of the adjusting wheel for the
pre-tensioner (1) is flush with bolt (2) in the center.
To adjust the pre-tensioner:
• Shorter initial thread:
Turn the adjusting wheel (1) clockwise.
• Longer initial thread:
Turn the adjusting wheel (1) counterclockwise.
Sequence
Check the tension of the needle thread after making major
changes to the pre-tensioning. If necessary, adjust the main
tension in order to achieve the desired result.
(1) - Pre-tensioner (2) - Bolt
①
②