-
Minor adjustment of the feed dog.
In case the machine, after the above described adjustments have
been carried through, does not yet feed correctly, check the
following points:
The pressure of the foot on the fabric is not correct. When adjust-
ing the pressure of the foot, keep in mind that:
Thick and heavy fabrics require a greater pressure than thin
and light fabrics.
Light pressure is required for fine and sheer fabrics so as to
prevent damage to the fabric.
The teeth of the feed dog are worn out. A visual inspection of the
feed dog, and feeling the sharpness of its teeth by touching
them
gently, usually is sufficient to determine whether the feed dog is
worn to such a degree as to necessitate its replacement with
a
new feed dog.
HOW TO CONTROL THE PRESSURE OF THE PRESSER FOOT
The pressure is controlled with the aid of the pressure
regulating thumb No. 85322 (see Fig. 61).
By loosening the pressure regulating thumb screw, the pressure of
the presser foot can be released. Make certain that the presser
foot always exerts a certain pressure upon the fabric.
The pressure upon the fabric increases gradually as the pressure
regulating thumb screw is turned down. The number scale in front
of the face plate, in connection with the presser bar index pin No.
85325, indicates the pressure exerted at the moment by the
presser bar spring No. 26050 upon the presser foot. In this
connection it should be mentioned that there is a well defined
though loose interdependence between the pressure imposed by
the presser bar spring and the tension of the upper thread.
Namely:
70
Copyright -2004
Summary of Contents for Supernova
Page 1: ...Instructions For Servicing The Necchi Supernova Sewing Machine 1 Copyright 2004...
Page 15: ...15 Copyright 2004...
Page 17: ...Fig 11 Fig 12 Fig 13 17 Copyright 2004...
Page 23: ...False needle Fig 18 False needle Fig 19 23 Copyright 2004...
Page 43: ...Fig 38 43 Copyright 2004...
Page 49: ...49 Copyright 2004...
