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Operation
Operating Instructions 878-M PREMIUM - 02.0 - 02/2018
Fig. 17: Setting needle thread tension
(1) - Pre-tensioner
(2) - Auxiliary tensioner
Setting pre-tensioner (1)
Set the pre-tensioner (1) so that it has the lowest tension possible,
but so high that, when taking out the sewn material after the
preceding trimming (when the tensioners (2) and (3) are switched
off), the thread is not pulled out of the pre-tensioner (1). (Pre-
tensioner (1) is not switched off at the top roller lifting).
Setting tensioners (2) and (3)
The machine can be equipped with a lever (4) for the auxiliary
tensioner (2) temporary switching off. In this case, two thread
tension values can be pre-selected and a good stitch tightening
can be achieved when sewing over a variable number of layers
of the sewn material with one seam.
1. Switch the auxiliary tensioner off (2) with the lever (4) and sewn
on a smaller numbers of layers.
2. Regulate the thread tension on the primary tensioner (3), until
a proper thread interlacing is achieved (see picture p. 36).
3. Switch the auxiliary tensioner on (2) by the lever (4) shifting
out and sew on a greater number of layers.
4. Regulate the thread tension on the auxiliary tensioner (2) until
a proper thread interlacing is achieved (see picture p. 36).
5. If the machine is not equipped with the lever (4), regulate the
tension by both tensioners (2) and (3) at the same time so that
their nuts are screwed approximately in the same height.
(3) - Primary tensioner
(4) - Lever
①
②
③
④
37
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