BERNINA International AG Seestrasse 161 CH-8266 Steckborn Schweiz Seite 116 von 172
DRAFT – VERSION
1
398142.03.0
+
5.12.2 Lower-thread tension (basic setting)
Check:
• Use white cotton thread DMC 50 BLANC 652010.20.++ for gauging.
• Use no. 0033924.70.00 gauge to adjust lower thread tension.
• The bobbin case is inserted into the weight gauge in the same way as into the hook.
• Hold free end of thread firmly and let the bobbin case and setting weight (without additional weight)
hang free.
• The bobbin case must not move downwards.
• After attaching an additional 3-gram weight 398142.03.0+ the
thread should unwind fast (unwinding speed: 1m/2-4 sec.).
Adjustment:
• Use a small screwdriver to adjust the lower thread tension by
turning the bobbin case spring screw as appropriate.
• Turn screw counterclockwise (to left) to slacken .
• Turn screw clockwise (to right) to tighten.
To Next Page
