11.10 Bobbin Case Holding Wire
Function
The bobbin case holding wire 1 holds the top of the bobbin case and
the bottom in a certain position counter to the turning movement of the
hook.
The needle thread loop guided around hook is pulled between the
sprung holding wire 1 and the edge 2 of the top of the bobbin case.
The holding wire 1 assures an unhindered through-feed of the thread
over the nose 7 of the bottom of the bobbin case and through the
recess in the needle plate.
Settings
–
There must be a thread through-feed gap of 0.6 to 1 mm between
the edge 7 of the securing nose and the edge of the needle plate
recess.
In this position the edge 8 of the top of the bobbin case lies about
parallel to the needle plate.
The gap assures a through-feed even with thicker sewing threads.
At the same time a sufficient jumping-back of the top of bobbin
case during the through-feed of the thread at the edge 2 is made
possible.
–
The holding wire 1 must extend 13 mm out of the plate 5 and lay
on precisely in front of the edge 2 of the top of the bobbin case 9.
1
2
7
8
9
10
3
4
5
6
0,6 - 1 mm
57
