Duerkopp Adler 558 Operating Instructions Manual page 81

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The cam 6 connected with the length setting slide operates the switch b2. The
thread catcher lowers.
Through the slide of the opener lever 8 onto the opener 7 the thread catcher is
opened.
Via the curve plate 3 it is swung in front of the needle to grip the upper thread.
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During further lowering the opener lever 8 falls off the opener 7.
The thread catcher closes.
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After cam 6 has run over the switch b2 the thread catcher with the clamped thread
moves back into the upper position.
Opener lever 8 thereby slides past behind opener 7 without being operated.
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