Pfaff 1422-900/81 Service Manual page 15

2 Manual cutting test
.13
Requirement
1. When thread catcher 1 is on its forward stroke, it must not carry bobbin thread 3
forward too.
2. When thread catcher 1 is in its front position, bobbin thread 3 must be approx. 2 mm
behind the prong of thread catcher 1.
3. After the trimming action, both needle- and bobbin thread must be perfectly cut, and
bobbin thread 3 retained.
Fig. 2 - 09
Sew a few stitches.
Turn off the on/off switch.
Carry out cutting test manually.
Check Requirement 1 and readjust thread catcher 1 according to Chapter 2.05 Thread-
catcher height if necessary.
Check Requirement 2 and readjust thread catcher 1 according to Chapter 2.06 Thread-
catcher position if necessary.
Check Requirement 3 and readjust bobb-thread retaining spring 2 according to Chapter
2.09 Bobbin-thread retaining spring if necessary.
2
3
1
2 mm
1
Adjustment
2 - 10