JUKI AMS-221EN Series Engineer's Manual page 61

Adjustment Procedures
Make adjustments according to the standard adjusting values.
o To increase the vertical presser speed, turn the knob
B.
o To decrease the vertical presser speed, turn the knob
A.
o Too much noise is generated
in Direction
o The presser does not rise.
in Direction
– 57 –
Results of Improper Adjustment
when the presser is lowered.