Pfaff 3811-2/45 Instruction Manual page 66

Move the knife carrier 11 (fig. 7) in accordance with the requirement (screw 12).
Requirement:
.1 Switch on the edge trimmer (key
.2 Bring the upper knife to its lowest position.
.3 Lay the upper knife onto the stationary knife with a small amount of pressure (screw 13; fig. 7).
.4 Position the knife carrier 11 (fig. 7) a little out of alignment with the stationary knife (screw 15).
.1 Remove the air supply.
.2 Pull the stroke bar 20 downwards as far as it will go.
.3 Taking care that the stopper 16 is touching the eccentric 17, adjust eccentric 17 in accordance with
the requirement (screw 21).
.4 Replace the air supply.
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There should be approx. 1 mm between the left edge of the upper knife and
the left edge of the needle plate insert (fig. 6).
The upper knife 9 should touch the stationary knife with a small amount of
pressure (The knife skid must not hit the stationary knife!)
The upper knife 9 (fig. 8) should be slightly out of alignment with the
stationary knife (scissor effect).
When the stopper 16 (fig. 9) is touching the eccentric 17, there should be a
clearance of approx. 5 mm between the front edge of the housing and the
lever 19 (fig. 10).
, LED on, fig. 2).