6. Bobbin case opening settings
6.1 Bobbin case opening
The thread lever must pull the thread through between the bobbin case
and its holder.
In order for this passing through of the thread to occur unhindered, the
bobbin case must be opened at this instant.
This allows the desired seam pattern to be achieved with the lowest
possible thread tension.
False settings can have the following effects :
–
Thread breakage
–
Eyes on the underside of the cloth
–
Loud noises
6.1.1 Size of t he finger run
Standard checking
Dependent on the subclass-end-no., lever 3 s hould be eccentrically
bearinged approx. 3 to 4 mm.
–
Check the distances
Caution Risk of Injury !
Turnthemainswitchoff!
Set the eccentricity only with the sewing machine turned off.
Correction
–
Loosen nut 4.
Use the special wrench (Order No. 0367 250030).
–
Turn the eccentric.
Subclass-End-No. 3 Eccentricity approx. 3 mm
(Subclass-End-No. 4 Eccentricity approx. 4 mm)
–
Tighten nut 4 again.
ATTENTION !
After a correction of the size, the open gap and the timing of the
opening are to be checked and corrected, if necessary.
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