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Operation
Operating Instructions 827/827-M - 01.0 - 02/2019
4.7.1
Setting the needle thread tension
Fig. 10: Setting the needle thread tension
①
②
③
④
(1) - Bolt
(2) - Pre-tensioner
Setting the pre-tensioner
When main tensioner (3) and additional tensioner (4) are open, a
small amount of residual tension of the needle thread is required.
This residual tension is generated by the pre-tensioner (2).
The pre-tensioner (2) also affects the length of the cut needle
thread end and, thus, the length of the initial thread for the new
seam.
To set the pre-tensioner:
1.
Turn the pre-tensioner adjusting wheel (2) until the front side
is flush with the bolt (1).
• Shorter initial thread: Turn the adjusting wheel (2) clock-
wise
• Longer initial thread: Turn the adjusting wheel (2) counter-
clockwise
(3) - Main tensioner
(4) - Additional tensioner
29
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