Thread Regulator - Bernina B 590 Service And Maintenance Manual

5.11 Thread regulator

Checking the tension power:
• Thread an approx. 30cm long thread into thread regulator.
• Attach the two thread ends to the BERNINA tension spring
scales (006038 50.00).
• Slowly move the scales up.
• On moving the regulator spring, the tension value must be
between 14 g and 17g.
Note:
Ensure that the spring scales are gauged.
Adjusting the tension power:
• Slightly untighten screw 17 (T10).
• Turning the thumb wheel 16 will tighten or slacken the tension.
• Retighten screw 17 (T10).
Checking correct position:
•
The thread regulator spring 15 must sit on the
setting lever 12 (pict. 1 - rear side)
•
At the same time, the distance between spring
and cover must be 1.6mm (+/-0.3mm).
Adjusting the position:
• Slightly untighten screw 6 (T10).
• Using a small screwdriver and positioning aid 6a, adjust setting lever 12 until a distance of 1.6mm is
reached (pict. 2 - front side).
• Retighten screw 6.
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