SINGER W1422 - Manual (Page 13)

1. By raising or lowering the presser foot lifter, the presser foot
goes up and down respectively.
2. For additional clearance, the foot lifter can be raised higher to
sew on heavy fabrics.
RAISING OR LOWERING THE PRESSER FOOT
REGULATING THE PRESSER FOOT PRESSURE
(Patch-O-Matic)
To release the pressure, push ring |A) downwards. This causes the
regulator to spring up to its highest position. The material is now
free from any pressure of the presser foot.
For sewing thin or light materials, push regulator |B) down just a
little to provide the light pressure required.
If you are sewing thick or heavy materials, push the regulator |B)
farther down to increase the pressure on the material.
ring (A)