Needle-Bar Support; Needle Bar - Bernina B 590 Service And Maintenance Manual

4.3.13 Needle-bar support

Disassembly of needle-bar support
• Remove the covers (see 4.1)
• Remove thread take-up cover (see 4.3.8 Thread take-up cover).
• Remove LED sewing light (see 4.2.6).
• Untighten screw 40 (T10 M3x4.5). Turn setting knee away.
• Unhook tension spring 50.
• Unhook tension spring 21.
• Pull needle-bar support to front completely 30. Slide needle-bar cam out of joint 31.
Assembly of needle-bar support:
•
Reinsert needle-bar cam into joint a.
•
Position needle-bar support on head-frame plate.
•
Rehook tension spring 37.
•
Position setting knee, adjust (no play or clamping), retighten screw 40 (T10 M3x4.5).
•
Use pinning tool 002733.50.00 to pin drive pinion.
•
Make sure that the zigzag segment is in the centre.
•
Rehook tension spring 50.
•
Refit thread take-up cover.
•
Adjust needle span (see 5.4.2
•
Adjust stitch-width stop (see 5.4.3
•
Adjust threader head level (
•
Refit covers (
see 4.1
•
Carry out a functional check. Sewing-off.

4.3.14 Needle bar

Disassembly:
• Remove needle-bar support
(see 3.3.7).
• Unhook spring 1.
• Untighten setscrew b (T6 M3x4) and remove needle-bar guide 033145.70.00.
• Disengage needle bar 3 by pressing catch 2, then slide it down and out of needle-bar support.
Assembly:
• Insert needle bar 3 into needle-bar support from underneath. Insert needle-bar cam into needle-bar
guide 033145.70.00 while keeping catch 2 pressed.
• Rough-set the needle-bar guide and secure setscrew b (T6 M3x4).
• Rehook spring 1.
• Refit needle-bar support (see 3.3.7)
• Adjust threader (see 4.9).
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see 5.8.1
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