Improvements in Driving Pulleys, applicable to Spindles of Spinning Machines.
Year: 1895

page_text: Date of Application, 30th Nov., 1895
Complete Specification Left, 12th Aug., 1896-Accepted, 28th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Driving Pulleys, applicable to Spindles of
Spinning Machines.
I, ERNST LIEBING, of Luisen Strasse 17, Berlin, in the Kingdom of Prussia,
Engineer do hereby declare the nature of this invention to be as follows:-
The driving of spindles in spinning machines as at present carried out suffers from
various inconveniences which make themselves felt in a very disturbing fashion
and principally in consequence of the fact that the spindles being driven at a very
high number of revolutions per minute even up to 5,000 revolutions cannot be
made to travel at the high speed by means of the usual pulleys with straight
smooth grooves. This circumstance is most felt when the strap is not drawn
extremely tight because as the spindles are only secured below whilst the upper
part is left free in order to remove and replace the spool a failure of rotation is
most liable to occur when the thread is at the upper end of the spool whereby a
certain catching of the spindle below is caused by the pull exercised by the thread
on the spool; this can in certain circumstances become so strong that the driving
band, especially if it has become rather slack, is no longer able to revolve the
spindle with the requisite speed so that the belt slips over the pulley without
carrying the spindle with it which frequently results in causing the 300 to
400 spindles in a spinning machine to all have various speeds, whereby of course
many breakages of the thread and unequal yarn results.
My invention has for its object to remove these difficulties in a simple
and efficient manner consisting essentially forming the groove of the pulley
and those of the driving drum of a suitable number of segments of a circle
connected one to the other and of suitable radius, the following always taking the
opposite curve to that of the foregoing one, that is to say the groove of the pulley
forms a series of curves more or less pronounced according to the purpose for
which the pulley is applied so that a line passing along the middle axis of the
groove will at each curve rest tightly against one side in such a manner as prevents
the escaping of the driving band as would easily occur were the bends too much
curved. These pulleys of my invention can be produced either in the form of two
halves cast separately and connected together, or the groove can be cut out of the
pulley by a suitably designed machine or the pulley might also be formed of two
pieces of strong sheet iron pressed to a suitable shape and secured together.
Dated this 30th day of November 1895.

page_text: Improvements in Driving Pulleys, applicable to Spindles of
Spinning Machines.
I, ERNST LIEBING, of Luisenstrasse 17, Berlin, in the Kingdom of Prussia,
Engineer, do hereby declare the nature of this invention, and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement :-
The driving of spindles in spinning machines as at present carried out suffers from
various inconveniences which make themselves felt in a very disturbing fashion
and principally in consequence of the fact that the spindles being driven at a very
high number of revolutions per minute even up to 5,000 revolutions cannot be
made to travel at the high speed by means of the usual pulleys with straight
smooth grooves. This circumstance is most felt when the strap is not drawn
extremely tight because as the spindles are only secured below whilst the upper
part is left free in order to remove and replace the spool a failure of rotation is
most liable to occur when the thread is at the upper end of the spool whereby a
certain catching of the spindle below is caused by the pull exercised by the thread
on the spool; this can in certain circumstances become so strong that the driving
band, especially if it has become rather slack, is no longer able to revolve the
spindle with the requisite speed so that the belt slips over the pulley without
carrying the spindle with it which frequently results in causing the 300 to
400 spindles in a spinning machine to all have various speeds, whereby of course
many breakages of the thread and unequal yarn result.
In order to obviate the various drawbacks above set forth in a simple and
certain manner, I have devised the invention herein set forth and illustrated in the
accompanying drawings.
Figure 1 shows a spindle with the invention in place consisting in the pulley
disc S provided with a serpentine curved groove.
Figure 2 shows a longitudinal section through the spindle.
Figure 3 shows the unrolled periphery of the band pulley and
Figure 4 the groove of one of the drums effecting the driving of the spindles.
On the second sheet of the drawings various modifications are illustrated, of
these:-
Figures 5 to 9 show a method of construction of the band pulley, and the same is
not constructed as in Figure 1 of cast iron but it is formed of two curved wrought
iron discs united by pressure by means of a ring or sleeve H. The said piece H
can, as shown in Figure 6, be shaped to form a guiding tube, or as shown in
Figure 7 consist simply of a ring provided with projections w the said projections w
being pressed on the putting together of the two discs S S¹ by simple pressure into the
corresponding depressions of the discs. Finally, the ring or sleeve can be entirely
dispensed with and replaced by leaving projections w (Figure 8) on the one disc S
which after the putting together of the two discs can be bent round upon the outer
side of the disc S¹.
The pulley represented in Figures 5 and 6 is constructed of sheet iron and
preferably in the following manner :-
Two sheet iron discs perforated in the centre for the passage of the spindle are
pressed into a waved shape by stamps or dies and then so connected together
that the pulley groove forms a wavy line as shewn in Figure 6, whereby the
elevations of the one disc correspond to the depressions of the other. The two
discs so disposed are then firmly connected together by means of a ring H having the
shape shewn in Figure 7, so that the rounded projections of the ring H are bent
outwards and pressed into the recesses of the folds (Figure 5). If however the
waved disc be closed above or below by a flat plate as shewn for instance in

page_text: Figure 6, then instead of the narrow ring (Figure 7) a longer piece of tube may be
used, and be secured to the surface of the disc.
Another modification is also that shewn in Figure 9 in which the spool
holder P serves immediately for the joining together of the discs S and S¹.
In the Figures 10-16 are shewn further modifications of the grooves of the
band pulleys, by means of which the driving band in the same way through
the formation of a serpentine line obtains a considerable increase of friction with
the object of a more perfect conveyance of energy.
The band pulley of my invention can obviously be made of any desired size and
strength and is applicable to other apparatus.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
An improved pulley characterised by the formation of the groove either in a
curved line, whereby in pulleys formed out of stamped plate, the curves serve at
the same time as a means of support, or the arrangement of alternately upper and
lower wedge shaped bodies in the straight or bent groove, serving to increase the
friction, and causing the driving band to form waves or curves.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.