Vibrating Presser Foot/Lifting Presser Foot Vertical Stroke Adjustment - Brother b831 Service Manual

Increase
/
Decrease
Feed dog
[io] VIBRATING PHESSER FOOT AND LIFTING PRESSER FOOT VERTICAL STROKE ADJUSTMENT
★ The vibrating and lifting presser feet move up and down in alternate steps.
* The vibrating and lifting presser feet will normally rise the same distance.
Loosen wing nut O and tighten the walking bar eccentric crank O at the center of the long axis.
Loosen bolt O-
Lower both the vibrating O and lifting O presser feet to the needle plate O.
Turn the main pulley. Stop when the thread take-up crank O is level as shown in the figure.
Make sure there is no play in the walking bar shaft O-