Test Buttonhole - Bernina activa 125 Service Manual

14 Test Programmes
Mechanical fine adjustment
4
Function of the automatic buttonholing device
What is to be tested
Automatic buttonhole compensation
1
What to adjust
Initial state of service programme.
Feed-dog at its highest point.
Mount the buttonhole foot.
Secure the buttonhole filter
No. 008 961.70.00 to the presser foot
bar. Lower presser foot and simulta-
neously press both buttonhole but-
tons.
If the stitch formation is not absolutely closed after
electronic compensation, a fine adjustment can be made
with the balance regulating shaft 3.
Procedure:
Remove the balance knob 1.
•
Loosen screw 2.
•
Turn the balance regulating shaft 3 as required.
•
Turning in a clockwise direction
Turning in an anticlockwise direc-
The balance knob (marker pin) can now be brought into
•
the basic position 4.
Tighten the screw 2.
•
Replace the balance button.
•
Normal condition
The feed-dog will move to and fro,
until the compensation has been
achieved.
If no compensation is possible, then
the programme will terminate the test
after ca. 3 seconds.
3
2