This invention relates to a new device for supporting the spindle
foot in spinners and twisting frames which, since it has a highly constant elastic
behaviour and stability over time as well as considerable simplicity of construction,
enables effective and economic elastic isolation of the vibrations of the spindle
foot from the fly frame or spindle holder with a consequent drastic reduction in
As is known, in spinners and twisting frames the ever faster rotation
of the spindles achieved by means of a drive belt which presses against the spindle
pulley, inevitably gives rise to considerable dynamic loads which are transmitted
to the spindle feet and from these, through the fly frame, to the entire structure
of the spinner or twisting frame with a consequent intolerable increase in noise
and a considerable worsening of textile characteristics due to the vibrations
produced on technologically critical organs such as the drawing cylinders.
In the current state of the art, attempts have been made to avoid
such problems by interposing an elastic element, usually an elastomer, between
each spindle foot and the said fly frame.
In this way, the said dynamic loads are substantially absorbed by
the elastic element and thus are only partially trasmitted to the fly frame.
Such a solution, however, involves a series of problems which do
not guarantee certain and lasting operation. In fact, the elastomer used is an
element which does not give the certainty of a constant performance for all the
spindles in that its elasticity depends on various factors such as the mixture
batch type, vulcanisation times, etc., and therefore it is highly unlikely that
it will be the same for all the elastic elements used. Moreover the elastomer,
subjected to the action of a constant and localised radial load as occurs in this
field of textile technology where the drive belt always pushes on the same side,
in time tends to cause permanent distortion with the result that the spindle foot
would in time assume an intolerable inclination to the vertical plane. Lastly,
the elastomer has no stability in time in that it is subject to ageing and tends
to degenerate, particularly in the presence of oils.
The aim of the present invention is precisely to avoid such problems
and provide a device to support the spindle foot which has above all a very simple
construction and is therefore economical, and also always has a well-defined constant
elastic behaviour as well as high stability in time.
This is essentially achieved by eliminating the use of any rubber
pad or elastomeric elastic element and interposing between the fly frame or spindle
holder and each spindle foot, to isolate elastically the vibrations of the spindle
foot and ensure that only a small proportion of these vibrations is transmitted
to the spindle holder, a container for the said spindle foot in which the elasticity
is achieved by means of one or more drawings in its surface depending on the degree
of elasticity required.
More precisely, the spindle foot supporting device, in order to fix
elastically the said spindle foot to the fly frame or spindle holder of spinners
and twisting frames, is characterised according to the present invention in that
it comprises a container into which the said spindle foot fits with a slight clearance,
the said container being rigidly secured at the top to the said fly frame or spindle
holder and comprising at the bottom a laminar body with at least one drawing inwards
or outwards of the said container, the bottom end of which is rigidly secured by
drive fitting, welding or gluing to the bottom end of the said spindle foot or
directly, if necessary after the appropriate enlargement of the said end of the
spindle foot, or by means of an adaptor bush integral with the said spindle foot.
Clearly, in this way considerable constructional simplicity is achieved
in that the device, apart from having a linear form, may be made by means of simple
plastic distortion of the material without any costly machining operation. Moreover,
drawing allows a precisely-controllable easily-repeatable elasticity which, since
it enables the distortions to be kept within the elastic field, always guarantees
that there will be a return to the initial conditions without any undesired consequences.
According to a preferred embodiment of the present invention, in
order to prevent dirt or dust from entering the chamber defined by the said small
clearance between the spindle foot and container, on the top of the said container
is an elastic seal.
The invention shall now be described in greater detail with reference
to the attached drawings which show preferred forms of practical embodiment given
purely by way of example but in no way limiting in that technical or constructional
variants may always be made without going beyond the scope of the present invention.
In the said drawings:
- Fig. 1 is a cutaway view in partial perspective of a spindle foot and its spindle,
elastically fixed to the fly frame or spindle holder by means of a supporting device
made according to the invention;
- Fig. 2 is a front cutaway view of Fig. 1;
- Fig. 3 is a partial front cutaway view of the spindle foot support according
to a variant of the invention;
- Fig. 4 is a front cutaway view of the spindle foot support according to another
variant of the invention.
With reference to the Figures, 1 shows a spindle foot within which
is supported rotatably, by means of bearing not shown in the Figure, rod 2 of a
spindle 3 which supports cop 4 and is rotated by a belt 5 (see Fig. 1) acting on
a pulley 6.
The said spindle foot 1 is then fixed elastically to the fly frame
or spindle holder 7 by means of a supporting device comprising a container 8 into
which fits the said spindle foot 1 with a small clearance 9, the said container
being rigidly secured at the top to the said spindle holder 7 by means of a flange
10 which butts against the bottom surface of the said spindle holder 7 and a tightening
The said container 8 also has at the top an elastic seal 12 capable
of closing the said clearance 9 and continues down to the bottom as a laminar body
13, with at least one drawing 14, the bottom end of which is rigidly secured to
the bottom end of the said spindle foot 1 by means of an adaptor bush 15 integral
with the said spindle foot 1.
By contrast, according to a variant of the invention shown in Fig.
3, the bottom end of the said laminar body 13 is rigidly secured directly to the
bottom end of the said spindle foot which for this purpose has an appropriate
enlarged part 1'.
Moreover, the said drawing 14 of the said laminar body 13 may be
directed towards the outside of container 8 as shown in Figs. 1-3, but may also
be directed towards the inside of the said container 8 which for this purpose must
have a thickness 16 of its body as well as adopt a thickness 17 of the said adaptor
bush 15 which are sufficient to contain the said drawing 14 as is clearly shown
in Fig. 4.