Bobbin Case Opening; General; Setting Of The Bobbin Case Opening - Duerkopp Adler 550-867 Service Instructions Manual

2.7

Bobbin case opening

2.7.1

General

2.7.2

Setting of the bobbin case opening

3
The thread lever has to pull the thread through between the bobbin
case and its holder.
For the thread to slip through without any hindrance the bobbing case
must be opened in this particular moment.
That way the desired seam pattern can be achieved with the least
thread tension possible.
Wrong settings can have the following consequences:
–
Thread breakage
–
Eyes on the seam's bottom side
–
Loud noises
2 1
Caution: Risk of injury!
Turn off the main switch.
Check and set the bobbin case opener only when the machine is
switched off.
Standard checking
The bobbin case opener 3 has to open the hook center 2 just enough
for the sewing thread to pass unimpededly between the bobbin case
dog 1 and the gap of the stitch plate. The opening gap X depends on
the thickness of the sewing thread.
–
Turn the handwheel and check, whether the bobbin case opener
opens the hook center wide enough.
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