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Shaft) which obtains its rotary movement from the revolving
balance wheel. The balance wheel, which is securely fastened
to the right hand end of the arm shaft, is driven by a belt from an
electric motor. The various movable parts of the sewing machine
obtain their respective movements from the rotary of the arm shaft
with the aid of connecting rods, cranks, levers etc. . . . Below the
bed of the machine is mounted the oscillating shaft (driver shaft),
to the left end of which is firmly attached the shuttle carrier. By
means of a crank connecting rod, and oscillating rock shaft, a
slide block and a shaft crank, the rotary movement of the arm
shaft is transformed into the oscillating movement of the carrier
shaft. The shuttle carrier, in turn, imparts the oscillating
movement to the oscillating shuttle which moves back and forth
inside of the shuttle race. The forward and backward, as well as
the up and down movements of the feed dog, are also obtained
from the rotary movement of the arm shaft by means of connect-
ing rods, rock shafts and a feed bar below the bed of the machine.
The up and down movement of the needle bar, as well as that of
the thread take-up lever, is also derived from the rotary
movement of the arm shaft by means of cranks and a
connecting link.
The bobbin case is placed on the post inside the oscillating
shuttle and then pressed into the oscillating shuttle. The
oscillating shuttle, after its point has entered the loop of the
needle thread, makes a partial revolution, just sufficient to carry
the enlarged loop of the needle thread over and around the
bobbin case and then lets it slide off easily from the oscillating
shuttle. After the rising thread take-up lever has pulled the
needle thread away from the oscillating shuttle, the shuttle
returns to its starting position. This oscillating movement of the
shuttle is repeated at every stitch.
To the arm of the machine are also attached the tension
mechanism for the needle thread (upper tension), and the
various thread guides which lead the thread from the spool to
the needle.
In the upper portion of the arm, the Automatic Device is installed,
consisting of a mounting plate on which the cam-carrying
bushing and the other component parts are assembled. The
Automatic mechanism is driven by a suitable cam mounted on
the upper shaft. The SUPERNOVA machine is provided with a
built-in motor inside the arm, as well as a transformer which
feeds the sewing light at 12 V and the motor at two different
voltages giving two different speeds.
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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...