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Operating instructions
Operating manual 806N Version 00.0 - 12/2012 75
The number of stitches you can make with the hook thread depends on
the type of thread and the material to be sewn. The procedure for estimat-
ing the approximate capacity is described in Section 5.6.2 Setting the
bobbin counter.
5.8.2 Adjusting the needle thread tension
Together with the hook thread tension, the needle thread tension influ-
ences the final appearance of the seam. It should be set so that the
desired seam appearance is achieved with the lowest possible tension.
Reliable operation of the thread cutter can also only be achieved with the
lowest possible pretension.
Figure 49: Adjusting the needle thread tension
You set the needle thread tension as follows:
1. Set the pretension so that the thread cutting functions reliably.
Perform a test run after making the setting and repeat the adjustment
until the desired result is achieved.
The pretension also affects the length of the needle thread end. This is
changed by turning the pre-tensioner:
Turning the pre-tensioner clockwise: Reduces the length of the
needle thread end X.
Turning the pre-tensioner counterclockwise: Increases the
length of the needle thread end X.
2. Adjust the pretension so that sewing is reliably performed and the
thread is also cut reliably.
Perform a test run after making the setting and repeat the adjustment
until the desired result is achieved.
3. Adjust the main tension so that the desired seam appearance is
achieve with the lowest possible tension.
Perform a test run after making the setting and repeat the adjustment
until the desired result is achieved.
(1) - Pre-tensioner
(2) - Main tensioner
(X) - Length of the needle thread end
77


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