Operation Manual

5. Optional Equipment
Electromagnetically Operated Upper Thread Catcher
5.1 General
The sub-class 558-221301 has the the electro-magnetically operated upper thread
catcher as standard equipment.
All other sub-classes can, on request, be outfitted with it at the factory or have it
retrofitted.
Function
The electromagnetically operated upper thread catcher grabs the upper thread
immediately after the thread cutting procedure and hold it clamped. When sewing the
next buttonhole it places it in the right seam.
The means:
•
Secure seam beginning even in light, loose weaves.
•
Beginning stitches drawn fast.
•
Trimming of the underside of the buttonhole is unnecessary because the starting
thread is overcast.
Parts set required for the retrofitting
Retrofitting attachment: Order no. 558 10002
Factory attachment: Order no. 558 10012
ATTENTION !
By equipment with the upper thread catcher in the individual sub-classes the following
points are to be observed:
558-231391 The maximum sewing length with thread catcher function is 32 mm.
For sewing lengths above 32 mm the upper thread catcher must be
deactivated (see chapter 2.2).
558-251301 The max. sewing length with thread catcher function is 42 mm.
For sewing lengths above 42 mm the thread catcher must be deactivated.
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