56 PFAFF
57.8.2 Cutting angle of the rear top knife in relation to the hook knife
Requirement: Hook knife 20 must be at a diagonal to rear top knife 7 (without lateral
pressure) by 0.05 to 0.1 mm (cutting angle, Fig. 15).
.1 Switch on trimming mechanism (key , LED on, Fig. 13).
Switch on step-cut (feather-cut) trimming mechanism (key , LED on.)
.2 Disconnect compressed air.
.3 Move hook knife 20 to the cutting position by means of cylinder 21 (unit must move freely and
without lateral play!)
.4 Set rear top knife 7 in cutting position (balance wheel).
.5 Set hook knife 20 in relation to hook knife 7 so that cutting angle corresponds with
requirement (screw 22).
.6 Re-connect compressed air.
57.8.3 Cutting pressure between rear top knife and hook knife
Requirement: The cutting pressure must only be as much as absolutely necessary.
After the cutting pressure is set, the diagonal position of hook knife 20 in relation to rear top knife 7
(cutting angle), set in chapter 50.8.2, must not be less than 0.05 mm.
Adjustment: adjust stop 23 (Fig. 14, screw 24).
Note: Make sure that cylinder 21 (Fig. 14) always moves through the full stroke limited by
stop 23.
Therefore, no lint must be allowed to collect in the area of stop 23 (arrow in Fig. 14).
When the rear top knife loses sharpness, increase the cutting pressure by means of
screw 24.
Do not increase the cutting pressure too much, or the hook knife may break!
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