Short thread cutter (KFA)
Service Instructions 867 - 04.0 - 10/2019 79
10. Loosen all 4 screws (6) on the set collar and push the set collar (6) as
far as it will go and against the control cam (7).
11. Tighten all 4 screws on the set collar (6).
12. Check the loop stroke ( p. 50).
16.4 Adjusting the counter blade
Fig. 65: Adjusting the counter blade (1)
Proper setting
The thread must be reliably cut using little pressure. The pressure is built
up starting at the marking (2).
Any 2 threads with the greatest strength used for sewing can be neatly cut
simultaneously.
Checking the proper setting
To check the proper setting of the counter blade:
1. Turn the handwheel until the thread-pulling knife (1) can be swung out
after the latch is triggered.
2. Swing out the thread-pulling knife (1) manually. To do this, press
the lever with the roller (3) to the right against the control cam (4).
3. Insert 2 threads into the thread-pulling knife (1).
4. Turn the handwheel until the knife swivels down.
5. Check whether the sewing threads have been cleanly cut and pressure
is built up starting at the marking (2).
Disturbance
Disturbances caused by an incorrect setting:
• Increased knife wear when the pressure is too great
• Problems in cutting the thread
(1) - Thread-pulling knife
(2) - Marking
(3) - Roller
(4) - Control cam
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