Knife Pressure - Pfaff 900/56 Service Manual

Adjustment
15

Knife pressure

22
Requirement
When half of front edge of catcher 3 has passed the knife cutting edge, knife 4 should
contact the edge of the thread catcher with light pressure.
4
Loosen screws 1 slightly.
Turn balance wheel to set needle bar 10 mm before b.d.c.
Operate engaging lever 2.
Turn balance wheel until half of front edge of catcher 3 has passed cutting edge of knife 4.
Maintain position and adjust position of knife 4 according to the requirement.
In this position, tighten screws 1.
For a cutting test, turn balance wheel to set catcher 3 at forward point of reversal.
Place two threads into thread catcher hook and turn balance wheel until catcher 3 returns
to starting position.
Increase knife pressure, if necessary.
Check this adjustment according to the requirement.
On two-needle machines, make adjustment twice.
1
3
-900/56
1
4
3
-900/61
2