52 PFAFF
50.5 Positioning the top knife bracket and front top knife according to the needle
plate
Note: In carrying out the adjustment and checks make sure that the top and bottom knives
do not strike each other.
.1 Remove rear top knife (Fig. 4, screws 8).
.2 Push in top knife assembly 1 (Fig. 5, tighten screws 2 just a little)
50.5.1 Cutting angle of the front top knife
Requirement: Front top knife 9 (Fig. 5) must be diagonal by 0.1 mm to bottom knife 10
(cutting angle) and rest against it without any side pressure (Fig. 6)
.3 Push top knife bracket 1 so far forward that front top knife 9 rests lightly against bottom knife
(screws 2).
.4 Turn top knife bracket 11 (Fig. 5) to one side according to requirement (screw 12).
Check: with clearance gauge.
50.5.2 Cutting position of the front top knife
Requirement: The rear edge of front top knife 9 must be absolutely flush with the edge
marked in Fig. 7 (see arrow).
Adjustment: Position knife bracket 1 (Fig. 1) according to requirement (screw 13).
50.5.3 Cutting pressure of the front top knife
Requirement: There must only be enough cutting pressure as absolutely necessary.
After the cutting pressure is set, the diagonal of 0.1 mm (cutting angle) set
according to chapter 57.5.1 must not be less than 0.05 mm.)
.4 Take out filter 4
.5 Clean filter and bowl with petroleum.
.6 Blow filter out from the inside with compressed air.
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