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Патент USA US2125034

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‘July 26, 1938.
'r. 1.. SHEPHERD
Filed March 18, 1936
Patented July 26, 1938
2425,34 ‘
UNITED. Starts earls-r 0 Fri es
2,125,034 "
Thomas Lewis Shepherd, London, England
Application March 18, 1936, Serial No. 69,544
In Great Britain May 15, 1934
5 Claims.
This invention is a continuation in part to
my main application No. 11,720 ?led the 18th of
March, 1935, and relates to elastic rubber, ?la
merits, threads or yarns, termed in this speci?ca
tion “rubber threads”, which are intended to be
used in the manufacture of fabric, clothing, lace
work and the like or parts thereof or for wearing
apparel of any description.
The object of the invention is to provide an
improved method and apparatus for forming rub
ber threads.
The invention will be pointed out in the accom
panying claims.
The invention will be described by way of eX
15 ample with reference to the accompanying draw
ing, in which:—
Figure 1 is a diagrammatic View of the prepara
tion of a thread;
Figure 2 shows the doctor knife, the printing
20 roller, and the belt in longitudinal view, for con
venience of illustration not in the same ‘relative
position as in Figure 1.
Figure 3 illustrates the formation of other
Two of such shapes may be inferred by refer
ence to Figure 3, which shows how an octagonal
section thread may be produced, and also a 10
thread half of which is semicircular, the other
half triangular. Threads of various shapes may
be formed for the purpose of increasing the grip
which covering windings will have upon it, and
also», when the threads are not covered, of lessen- 15
mg the slip between thread and fabric.
By using an intermediate roller I ?nd that the
supply of latex or rubber solution to the main
roller may be arranged to approximate to require
ments, and that it has advantages in this respect 20
‘over running the main roller itself dipping in the
solution, especially when the intermediate roller
is doctored, for instance as shown by the doctor
it in Figure 1.
In this form a rubber solution or latex is fed
from a tank 1/ by means of an intermediate roller
2 to a roller I!) which is grooved as shown at H
carried by the belt and solidi?ed by the usual
in Figure 2, the cross-sectional size of the grooves
of which will correspond with the diameter of
the ?laments or threads it is desired to produce.
The feeding of the solution or dispersion to such
a grooved roller i0 is controlled by a doctor blade
or member l2 which will remove any excess of
at I5 in Figure 2. The roller may be constructed
to have a plain surface.
The shapes of the recesses or grooves in the
doctor blade and, if grooves are provided, in the
roller are arranged to suit requirements, and I
have found that a variety of shapes may be pro
duced by these means.
solution or dispersion from the circumference of
the roller in between the grooves and at the same
time will shape the upper surface of the threads
which it forms.
The roller I0 is kept in rotation and is arranged
adjacent an endless belt l3 passing over a roller
40 Ill, such belt being designed to have line contact
with the roller H] as shown so as to remove there
from and carry forward continuous ?laments or
threads of solution or dispersion from the tank y,
carried in each groove in the roller so that the
45 ?laments or threads may be said to be printed
upon the moving belt. The threads pass on to
an endless belt or on to a belt in the form of
a band of paper or other material between the
roller and endless belt and in that way be brought
‘50 adjacent to a suitable heating apparatus or over
steam heated cylinders so as to dry the threads.
The full cross section of a thread is formed
partly by the cross-sectional form of the recesses
or grooves II and partly by complementary re
55 cesses or notches in the doctor blade as indicated
The threads of rubber solution or latex are
methods, that is, in the case of either rubber solu
tion or latex, by a drying process or, in the case
of latex, by a coagulating process. They are then
separated from the belt and treated or used as
desired. The threads in the example pass on
to a belt upon which they are rendered solid by
coagulation or drying or both. It is possible how
ever to coagulate or dry or both upon the roller.
The rubber or latex solution used is a solution
of rubber or an aqueous dispersion of rubber par
ticles and the consistency must be such that the
threads retain their shape on the belt and on the
roller, except when in?uenced by the doctor blade
or blades.
The rubber solution or latex may be formed
into threads by a doctor by being applied to a
moving belt and being moved past a stationary
doctor which is provided with recesses. In such
a case the belt may also be provided with re-
cesses, The doctor and grooves in the upper part
of Figure 2 might serve to illustrate this, since
the cross section of the thread would be formed
in an analogous manner.
Having now described my invention, what I 50
claim as new and desire to secure by Letters Pat
ent is :
1. Apparatus for forming rubber thread, con
sisting of a rotating roller, a stationary recessed
doctor adjacent said roller, means for applying 55
a rubber-containing fluid to said roller, and
means for removing rubber thread from said
2. Apparatus as claimed in claim 1, in which
the means for applying said rubber containing
fluid consists of a further roller and a doctor
blade cooperating therewith.
3. Apparatus‘ as claimed in claim 1, in which
the roller has grooves which register with the
10 recesses in the doctor.
4. Apparatus as claimed in claim 1, in which
the means for applying said rubber containing
fluid consists of a further roller, and in which the
?rst mentioned roller has grooves which register
with the recesses in the doctor.
5. Apparatus for forming rubber thread, con
sisting of a moving surface, a groove on said sur
face for shaping the under side of the thread,
a stationary doctor adjacent to the path of said
surface and contacting with said surface on both
sides of the groove, and a recess in said doctor
for shaping the upper side of the thread.
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