54 PFAFF
50.6 Neutral point of top knife movement
Requirement: When the trimming mechanism is switched off, the top knives must be
motionless.
Switch of trimming mechanism (key , LED off, Fig. 8).
Set link 14 (Fig. 9), while turning the balance wheel, so far forward or backward that the top
knives become motionless (screw 15).
50.7 Setting top knife at highest point
Requirement: The top knife must be set at the highest point of its stroke
Adjustment: eccentric screw 16 (screw 17).
50.8 Positioning the rear top knife and hook knife (after changing top knives)
(For adjustments required after a new top knife bracket is fitted, please see chapter 57.11.)
50.8.1 Lateral position of the rear top knife to hook knife
Requirement: The rear edge of rear top knife 7 (Fig. 11) must be flush with hook knife 20
(see arrow in Fig. 11).
.1 Remove front top knife 9 (Fig. 10, screws 18).
.2 Loosen knife retaining screws 8 (Fig. 12) and position rear top knife to side according to
requirement.
.3 Continued on page 56.
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