Edge Trimming System; Trimming Movement; Neutral Point; Knife Height - Pfaff 3822-1/22 Instruction Manual

49 Edge trimmer system
49.1

Trimming movement

Requirement:
.1 Switch on trimming mechanism (key
.2 Set needle bar at top of its stoke (balance wheel).
.3 Adjustment: turn eccentric 1 until top knife is at top of its stroke (screws 2, Fig. 3).
49.2 Neutral point (no cutting movement)
Requirement:
.1 Switch off trimming mechanism (key
.2 Turn eccentric pin 3 (Fig. 3) so that eyes of levers 4 and 5 are aligned with each other (screw 6).
.3 Turn lever 7 until top knife is motionless when balance wheel is turned (screw 8).
49.3

Knife height

Requirement:
.1 Remove presser foot
.2 Switch on trimmer (key
.3 Set top knife in lowest position (balance wheel).
.4 Position top knife 9 (Fig. 5) according to requirement (screws 10).
46 PFAFF
(only on 3822-1/22)
Top dead centre of needle bar (= adjustment hole "5", Fig. 1) = top of knife
stroke.
When the trimming mechanism is disengaged and the balance wheel is
turned, there must be no up- or downward movement.
When the knife is in its lowest position the front of the cutting edge must be
about 0.5 mm under the top needle plate surface (Fig. 4)
, LED on, Fig. 2)
, LED on, Fig. 2).
, LED off, Fig. 2).