ADJUSTING THE MOVEMENTS OF THE VARIOUS GROUPS
OF PARTS IN RELATION TO EACH OTHER
(TIMING THE MACHINE)
To obtain a continuous and satisfactory performance from the
machine, the movements of the various groups of parts in
relation to each other must be adjusted (timed) in such a manner
that the actions of these parts repeat themselves regularly at
certain fixed time intervals. In the following are explained the
most important timing procedures, omitting operations which are
solely performed on the assembly line in the factory where the
machines are made.
For each timing procedure is also mentioned the corresponding
timing gauge which should be part of the mechanic's equipment.
Furthermore, whenever possible, a general rule for the timing
procedure in question is given, in case the corresponding timing
gauge should not be available to the mechanic.
Timing, performed in accordance with the rules set down in the
following chapters, is indispensable when:
One or several elements of a group of parts have been
replaced
whose actions depend on those of another group of parts, or
when
entire groups of parts, depending on each other, must be
removed
and replaced.
It is necessary to check the proper function of a group of parts in
relation to another group of parts, the movements of these
groups
depending on each other.
Certain disturbances must be eliminated which interfere with the
proper progress of sewing.
The following five interdependent adjustments are essential:
The timing of the movements of shuttle and needle bar.
The timing of the movements of feed dog and needle bar.
20
Copyright -2004
Содержание Supernova
Страница 1: ...Instructions For Servicing The Necchi Supernova Sewing Machine 1 Copyright 2004...
Страница 15: ...15 Copyright 2004...
Страница 17: ...Fig 11 Fig 12 Fig 13 17 Copyright 2004...
Страница 23: ...False needle Fig 18 False needle Fig 19 23 Copyright 2004...
Страница 43: ...Fig 38 43 Copyright 2004...
Страница 49: ...49 Copyright 2004...
