Operation Manual

Operation
36 Operating Manual 967 version 00.0 - 11/2013
Setting needle thread tension on Classic machines
For Classic machines, the key (3) can be used while sewing to
switch to a second thread tension, e.g., if different material should
be used in the middle of a seam.
Fig. 18: Setting needle thread tension on Classic machines
1. Set the tension on the auxiliary tensioner (4), sew a test seam
and cut the thread.
 The end of the thread in the needle should be between
60 - 80 mm.
If the thread is shorter:
Gradually reduce the tension on the auxiliary tensioner until
the desired length is reached.
If the thread is longer:
Gradually increase the tension on the auxiliary tensioner until
the desired length is reached.
2. Press the key for switching thread tension (3)
until the LED turns off.
 The auxiliary tensioner (1) will release pneumatically.
3. Sew on material requiring a low needle thread tension and
regulate the tension on the primary tensioner (2) until the
proper thread interlacing is reached.
4. Press key (3) to switch thread tension.
 The key illuminates and the auxiliary tensioner (1) engages.
5. Sew on material requiring a high needle thread tension and
regulate the tension on the auxiliary tensioner (1) until the
proper thread interlacing is reached.
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(1) – Auxiliary tensioner
(2) – Primary tensioner
(3) – Key on keypad for switching thread tension
(4) – Pre-tensioner
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