13.3 Counter knife and underthread clamp
Standard checking
The clearance between the blade of the counter knife 1 and the slider
guide 3 should be “X” mm.
(x=26mmwitha26mmq bobbin / x = 25 mm with a 32 mm q bobbin)
The knives s hould securely cut with the least possible pressure of the
counter knife on the thread pulling knife 2. This is normally the case w hen,
with the knives half overlapped, the counter knife blade just touches the
thread pulling knife.
During the trimming sequence the underthread clamp 4 should firmly clamp the
underthread so that it is securely caught by the needle thread during sewing-on.
Trim the threads with the manually operated thread pulling knife. Pull the
thread out of the clamp and thereby check the clamping effect. If the clamping
effect is too great or too small, then the underthread clamp must be set again.
Caution Risk of Injury !
Turnthemainswitchoff.
Set the counter knife and underthread clamp only with the sewing
machine turned off.
Correction
Counter knife
–
Loosen screws 7 and 8.
–
Align the counter knife carrier.
The above points must be met.
–
Tighten screws 7 and 8 again.
Underthread clamp
–
Loosen screws 5 and 6.
–
Align the underthread clamp 4.
The above points must be met.
–
Tighten screws 5 and 6 again.
ATTENTION !
When the pressure of the counter knife is set too high, then
this leads to increased knife wear. A false s etting of the
underthread clamp can lead to sewing-on problems.
54
3
4
5
6
7
8
1
2
“X”
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