DURKOPP ADLER LP 2971, Инструкция по эксплуатации

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6.4.2 Adjusting the needle thread tension
Adjusting the pre-tensioner (1)
–
When the main tensioner (3) and supplementary tensioner (2) are
open, the needle thread must be under slight residual tension. This
residual tension is produced by the pre-tensioner (1).
The pre-tensioner (1) simultaneously affects the length of the end
of the severed needle thread, the starting thread for the next seam.
(Tensioner (1) is not switched off at the foot lifting).
Adjusting tensioners (2) and (3) with electro-magnetic control
–
Regulate the thread tension with the tensioner (3), till a good
thread loop is achieved (see below).
–
Regulate the thread tension with a tensioner (2), till a good thread
loop is achieved (see below).
–
Regulate the tension by both tensioners (2) and (3) at the same
time so that their nuts are screwed approximately in the same
height.
Correct interlacing of threads in the center
of the material
Needle-thread tension too weak
or
Hook-thread tension too strong
Needle-thread tension too strong
or
Hook-thread tension too weak
12
3
2
1