Bernina B 570 - Thread Take-Up Lever and Thread Regulator Spring; Thread Regulator Spring

BERNINA International AG Seestrasse 161 CH-8266 Steckborn Schweiz Seite 80 von 172
DRAFT – VERSION
4.3.18 Thread take-up lever and thread regulator spring
Disassembly:
• Remove the covers (see 4.1
)
• Remove thread take-up cover (see 4.3.12).
• Remove micro switch bracket screw (T10) (thread tension release when presser foot is raised).
• Untighten screw (T20) and u-bolt so far as to be able to slide link shaft out.
• Fold shaft to front and slide thread take-up lever to left and out of shaft.
Assembly:
• Slide thread take-up lever back onto shaft to the right.
• Fold link shaft to back and bring under u-bolt. Slide take-up lever to right and retighten screw (T20)
and u-bolt.
• Position micro switch bracket and micro switch properly, taking care that the positioning knob sits
properly and the contactor runs in the guiding fork. Retighten screw (T10).
• Refit thread take-up cover (see 4.3.12
).
• Refit covers (if appropriate) (see 4.1).
4.3.18.1 Thread regulator spring
Disassembly:
• Remove head cover.
• Untighten screw 17 (T10 M3x5).
• Remove thumb wheel 16.
• Remove regulator spring 15.
Assembly:
• Refit regulator spring 15.
• Refit thumb wheel 16, taking care that regulator spring slides into bore.
• Refit screw 17 (T10 M3x5). Retighten slightly.
• Adjust thread regulator spring (see 5.11).
• Retighten screw 17 (T10 M3x5).
• Refit head cover.