Readjusting Hook Position In Sewing Direction / Hook Eccentric - Pfaff 3538-20/02 Adjustment Manual

Adjustment
13 Readjusting hook position to sewing direction / hook eccentric
.05.10
Adjusting the maximum stitch length
Checking the hook driving eccentric
14
Rule
When the needle bar is positioned 4.2 mm after b.d.c. and stitch length regulation is
4.5 mm, the hook point should be at the needle midpoint.
4
3
Fig. 13 - 10
Move the needle bar to a position 4.2 mm after b.d.c. by turning the handwheel.
Secure the c-clamp to the needle bar in this position so that the upward movement of
the needle bar is blocked.
Adjust the bracket 1 (screw 2) according to the rule.
Turn the handwheel against the direction of rotation until the c-clamp lays fl at again.
Measure the clearance between the hook point and the edge of the needle - the clear-
ance should be 3.3 mm.
In the event that this differs, turn the handwheel in the direction of rotation until the c-
clamp lays fl at again and make the following adjustment:
Measured value is larger than 3.3 mm, turn the eccentric 3 (screw 4) so that the hook
moves to the left by half the value of the measured difference.
Measured value is smaller than 3.3 mm, turn the eccentric 3 (screw 4) so that the hook
moves to the right by half the value of the measured difference.
Restore the setting indicated in the rule after a correction has been made to the eccen-
tric 3.
Maintain stitch length regulation for the next setting.
1
2