Long thread trimmer (LFA)
Service Instructions M-TYPE DELTA - 00.0 - 12/2019 95
15.3 Adjusting the cutting pressure
Fig. 78: Adjusting the cutting pressure
The shape of the thread-pulling knife (4) automatically creates the required
cutting pressure as soon as the thread-pulling knife (4) and counter blade (2)
make contact.
Proper setting
In resting position, the hook thread clamp (3) makes contact with the thread-
pulling knife (4) without any pressure being applied. Any 2 threads with the
greatest strength used for sewing can be neatly cut simultaneously.
Disturbance
Disturbances caused by an incorrect setting:
• Increased knife wear when the pressure is too great
• Problems when sewing if the hook thread clamp is too high
• Problems in cutting the thread
To adjust the cutting pressure:
1. Open the throat plate slides ( p. 28).
2. Turn the handwheel until the thread-pulling knife (4) can be swung out
by hand.
3. Loosen the screw (1).
4. Loosen screws (6) on the hook thread clamp (3).
5. Loosen the screws (5).
(1) - Screw
(2) - Counter blade
(3) - Hook thread clamp
(4) - Thread-pulling knife
(5) - Screw
(6) - Screws
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