27. Adjusting the upper blade
Requirement:
With the upper blade at its lowest point, the upper and lower blades must overlap by 1.0 to 1.5 mm
while at the same time forming a right angle to the needle plate (figure 48).
Check:
● Turn the handwheel in the normal direction until the upper blade is at its lowest point.
● Check the overlapping of the upper and lower blades.
Setting:
● Turn the handwheel in the normal direction until the upper blade is at its lowest point.
● Loosen the screw 32 (figure 49).
● Adjust the overlap of the upper and lower blades by moving the upper blade 38.
● Tighten the screw 32.
● Loosen the screw 34 on the fixing collar 35 (figure 50).
● Adjust the upper blade 33 so that it forms a right angle with the needle plate.
● Tighten the screw 34.
Note:
To ensure that the upper blade switches on and off perfectly, there must be a clearance of 1.0 mm bet-
ween the fixing collar 35 and the drive lever 36.
Test:
● As described under “Check”.
46
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