Correct thread interlacing in the center
of the material
Needle-thread tension too low
or
hook-thread tension too high
Needle-thread tension too high
or
hook-thread tension too low
6.5 Switching the thread tensioner on/off
All machines
–
When pulling the hand lever (1) towards the operator, the
tensioners (3) and (4) are switched off.
–
Tensioner (2) is never switched off.
Manually controlled machines (without the thread trimming)
–
Tensioners (3) and (4) are mechanically switched off when the foot
is lifted with a hand or knee lever.
Machines with the thread trimming
–
Tensioners (3) and (4) are switched off with an electric magnet or
pneumatic cylinder at the foot automatic lifting. If the automatic foot
lifting at the machine stop is pre-selected, the tensioners are
switched off, but temporarily only, so that the switching off electric
magnet does not overheat.
–
Tensioners (3) and (4) are also switched off temporarily during the
trimming cycle.
–
Tensioners (3) and (4) are not switched off at the foot lifting with
the hand or knee lever.
13
GB
1
2
3
4
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