Loop Lift - Bernina B 590 Service And Maintenance Manual

5.5.3 Loop lift

Check:
• Start machine in Service Program. Select test 5e.
• Use pinning tool 007937.50.00 to pin SW stepping motor =
center needle position (at 9 on 9mm SW machines, at 5 on
5.5mm SW machines).
• Use a size 130/705H TCN 80Nm needle.
• Set needle bar position as follows (loop lift):
o Set needle bar to BDC.
o Use loop-lift gauge 734571.70.01 to attach clamp from right
in such way that the machine is locked in BDC position
A).
o Move base body of gauge to right until needle bar is risen
by 2.618mm (pict. B).
•
Hook tip must be flush with left needle edge.
Adjustment:
• Remove loop lift gauge.
• Use pinning tool 007937.50.00 to pin stitch-width stepping motor =
center needle position.
• Slightly untighten second setscrew c2 (T10) on bevel gear in direction
of rotation.
• Adjust needle bar position again:
o Set needle bar to BDC.
o Use loop-lift gauge 734571.70.01 to attach
clamp from right in such way that the
machine is locked in BDC position (pict A).
o Move base body of gauge to right until
needle bar is risen by 2.618mm (pict. B).
• First setscrew is now accessible. Slightly untighten setscrew c1 (T10) on bevel gear in direction of
rotation.
• Turn bevel gear until the hook tip is flush with the left needle edge.
• Slightly push bevel gear against white wheel (undo clearance) and retighten first setscrew c1 at the
same time. The two gear wheels must run smoothly (no play, no clamping).
• Remove loop lift gauge.
• Retighten second setscrew c2 in direction of rotation.
• Check again and repeat setting if required.
• Recheck loop lift.
Front cover connected
Recheck:
• Start machine in Service Program.
BERNINA International AG Seestrasse 161 CH-8266 Steckborn
DRAFT – VERSION
5.5mm
pict
(
007937.50.00
734571.70.01
c2
c1
Schweiz Seite 96 von 172
9mm
A
B