Thread cutter
72 Service Instructions 867-M PREMIUM - 03.0 - 05/2017
15.3 Setting the cutting pressure
Fig. 61: Setting the cutting pressure
The shape of the thread-pulling knife automatically creates the required
cutting pressure as soon as the thread-pulling knife and counter blade
make contact.
Proper setting
In resting position, the hook thread clamp makes contact with the thread-
pulling knife 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 on if the clamping pressure is too high
• Problems in cutting the thread
To set the cutting pressure:
1. Open the throat plate slide ( p. 20)
2. Turn the handwheel until the thread-pulling knife (3) can be swung out
by hand.
3. Loosen the screw (1).
4. Position the thread-pulling knife (3) so that the arrow mark is exactly
next to the tip of the counter blade (2).
5. Turn the hook thread clamp (5) so that it rests against the thread-pulling
knife (3).
6. Turn the counter blade (2) so that it rests against the thread-pulling
knife (3).
7. Tighten the screw (1).
8. Check the position of the cutters, since the counter blade can easily
become warped when the screw is being tightened.
(1) - Screw
(2) - Counter blade
(3) - Thread-pulling knife
(4) - Screw
(5) - Hook thread clamp
(6) - Screw
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