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Thread cutter
16.3 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.
Correct setting
In the rest position, the lower thread clamp makes contact with the thread-
pulling knife without any pressure being applied. Two threads with the
greatest strength for sewing can be neatly cut simultaneously.
Faults caused by an incorrect setting
• Increased knife wear when the pressure is too great
• Problems when sewing on if the hook thread clamp is too high
• Problems in cutting the thread
Cover
• Throat plate slide
Figure 60: Setting the cutting pressure
(1) - Counter-blade screw
(2) - Counter-blade
(3) - Thread-pulling knife
Setting steps
1. Turn the handwheel until the thread-pulling knife (3) can be swung out
2. Loosen the counter-blade screw (1).
3. Position the thread-pulling knife (3) such that the arrow mark is exactly
4. Turn the lower thread clamp (5) such that it rests against the thread-
5. Turn the counter-blade (2) such that it rests against the thread-pulling
6. Tighten the counter-blade screw (1).
Service manual H867 Version 00.0 - 08/2013
WARNING
Risk of injury
Switch the sewing machine off before you check and set the
counter-blade and the lower thread clamp.
(
Section 4.4.5 Opening and closing the throat plate slide, page 13)
by hand.
next to the tip of the counter-blade (2).
pulling knife (3).
knife (3).
(4) - Fastening screw
(5) - Lower thread clamp
(6) - Lower thread clamp screw
73
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