Adjusting the thread tensioning plate
66 Service Instructions 869-M PREMIUM - 00.0 - 07/2018
13.3.2 Checking the adjusted thread tension using a mechanical
thread scale
Fig. 52: Checking the adjusted thread tension (1)
To check the adjusted thread tension:
1. Insert the needle thread as shown above.
2. Feed the needle thread through the thread lever and the thread scale.
3. Pull the thread to the left at a consistent rate of speed.
Important
The thread must be pulled off horizontally.
4. Set the thread tension to level 1 (1%) at the control panel.
The thread scale should show a tension of 190±12 cN.
5. Set the thread tension to level 2 (50%) at the control panel.
The thread scale should show a tension of 720±50 cN.
6. Set the thread tension to level 3 (99%) at the control panel.
The thread scale should show a tension of 1600±100 cN.
Important
After completing the settings, you need to seal the magnets and the 4 nuts
that keep the magnets in place at the thread tensioning plate with sealing
wax (see figure 7).
7. Remove the locking peg from the machine.
8. Remove the needle thread from the thread scale.
9. Remove the thread scale.
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