Basic Setting Of Knee-Operated Presser-Foot Lifter (Fhs); Thread Tension; Thread Tension Release - Bernina 330 Service And Maintenance Manual

5.9 Basic setting of knee-operated presser-foot lifter (FHS)

Check position:
•
The distance between needle bar centre and lifter lever end
should be approx. 160mm.
Correction of position:
•
Insert lifter lever into seat 11.
•
Loosen screw 10 (T20).
•
Position lifter lever as required.
•
Retighten screw 10 (T20).
Checking of presser-foot lever release:
•
Raise presser-foot lever.
•
Turn upper-thread tension adjustment wheel to 10.
•
When the knee-operated lifter lever is actuated, the presser-foot
lever must release (drop).
Correction of presser-foot lever release:
•
Loosen screw 4 (T20).
•
Turn eccentric 3 until the presser-foot lever releases (drops).
•
Retighten screw 4 (T20).
•
Check thread-tension release mechanism and correct if necessary (release lever must stand free).
•
Set upper-thread tension adjustment wheel back to basic setting.

5.10 Thread tension

5.10.1 Thread tension release

Check:
•
Lower presser-foot lever.
•
Release lever 44 must not touch the pressure
piece 1 – neither at 0 nor 10 position of the
adjusting wheel.
•
Raise presser-foot lever and set upper-thread
tension adjustment wheel to 10.
•
The distance between the tension discs must
be minimum 0.3mm.
Correction:
•
Raise presser-foot lever.
•
Set upper-thread tension adjustment wheel to
10.
•
Loosen lock nut 7.
•
Use adjusting screw 8 to set pressure piece distance to minimum 0.3mm.
•
Retighten lock nut 7.
BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland
11
4
7
44
8
1
0.3mm
10
3
42