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Патент USA US3095171

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June 25, 1963
Filed Aug. 1, 1957
FIG. 3.
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United States Patent 0 ’ ice.
Rawson Atwood, Rumson, and Charles C. L’Allemand,
Murray Hill, NJ.
Filed Aug. 1, 1957, Ser. No. 675,739
1 Claim. (Cl. 242-159)
Patented June 25, 1963
tively prevents any objectionable sloughing or axial move
ment of the yarn.
The invention in its broader aspect is not limited to any
particular construction ‘of bobbin, as for example, to a
bobbin composed of metal inner barrel with plastic cover
ing, but is applicable also to molded or turned bobbins
made of any of various materials, provided they may be
suitably microgrooved either by cutting, molding or press
This invention relates to improvements in textile
ing the groove in the surface of the bobbin.
In the particular bobbin shown by way of example, the
More particularly, the invention is concerned with pro
plastic cover is composed of an acrylonitrile copolymer
viding an improved bobbin surface which minimizes
such as marketed under the trade name Kralastic, although
sloughing or axial movement of yarn along the bobbin as
a variety of other thermoplastic or thermosetting resins
it is being wound.
may be employed. With this material, the cover 4 may
A bobbin embodying the invention in a preferred form
conveniently be manufactured in the form of tubing and
will now ?rst be described with reference to the accom 15 the microgroove may be pressed into the surface by means
panying drawing, the features forming the invention will
of a suitably grooved metal die.
then be pointed out in the appended claim.
The precise size and pitch of the microgroove may
In the drawing:
be selected with reference to the manufacturing processes
FIG. 1 is a side elevation of a bobbin embodying the
20 employed to produce it, the characteristics of the material
invention in a preferred form;
of which the bobbin surface is composed and the class of
FIG. 2 is an end elevation of the bobbin of FIG. 1;
service for which the bobbin is used. It will be noted that
FIG. 3 is ‘an axial section of the bobbin of FIG. 1;
FIG. 4 is a much enlarged developed elevation view of
a part of the surface of the bobbin, generally within the
area indicated by the circle 4-4-4 of FIGURE 1; and
FIG. 5 is a section on the line 5—5 of FIG. 4.
The improvement of the invention is applicable to bob
bins with a great variety of surfaces, structures, sizes and
proportions. However, for de?niteness ‘and by way of
example, the bobbin is shown herein with some complete
the size of the groove may be and preferably is very small
with reference to even very ?ne yarns, as even 15 denier
?lament has a diameter of about 1.7 mills, while 60 denier
?lament has a diameter of about 3.4 mills. In general,
the pitch or Aaxial spacing between adjacent grooves is at
least equal to and preferably is two to four times the
thickness of the ?lament, while the groove itself has a
depth and width which may be a very small fraction of
even a very ?ne yarn or ?lament diameter. For example,
a groove at a depth of .0002 has a depth and width
Referring to FIGS. 1-3, inclusive, the bobbin illustrated
amounting to only about 15% of the diameter of even a
is generally of the type shown in our previous application
fine ?lament such as 15 denier nylon. In general, groov
Serial No. 494,405, filed March 15, 1955, now Patent No. 35 ing having a depth in a range from about .0001” to .001"
2,953,317, for Spool. The bobbin comprises an inner
can be manufactured in a practical manner and furnish
barrel member 1, which may be of sheet steel or other
resistance to sloughing while not interfering with winding
material possessing the required strength, a drive end ?t
the yarn. In consequence, the characteristics of the bob
ting 2, a top end ?tting 3 and a plastic outer barrel ‘or
bin so far as winding and unwinding of the yarn are con
covering 4. The major part of the outer surface of the 40 cerned are practically una?ected land the surface is to all
barrel is, however, specially constructed or treated over
intents and purposes a smooth one. However, the groov
the shaded area 5 to minimize sloughing or axial move
ing presents suf?cient resistance to axial movement of
[HlBIlt of the yarn. While sloughing creates more of a prob
yarn in contact with the bobbin surface to prevent slough
lem in the lower deniers and in ?laments such as nylon,
ing in a very effective manner.
the invention has been found to be of utility within a 45
The preferred method of microgrooving the bobbin
denier range of 15 or even lower, up to 70 denier or even
surface consists in placing the plastic cover tube in a cavity
higher, and is of utility w'thout regard to the speci?c ma—
die having a sharp V-thread of the desired pitch, in the
terial of which the ?lament or yarn may be composed, and
case illustrated by way of example, 128 threads to the
wherever di?iculty due to sloughing is experienced.
inch, and expanding the plastic tube outwardly against the
The cover 4 of the spool illustrated is roughened or 50 cavity die under a pressure of 3,000e6v,000 psi The
ridged over the area 5 in a manner so as not to interfere
cover tube of the indicated acrylonitrile plastic and the
with the winding or unwinding of the yarn, while pre
wall thickness of .02. inch may be indented in this manner
venting axial slippage. The preferred form of surface
very readily. Under these conditions, there may be an
roughening is shown on a ‘much enlarged scale in FIGS.
indicated bite of the thread into the outer surface of the
4 and 5. As there shown, the surface of the bobbin is 55 plastic of about one-half a thousandth of an inch, resulting
circumferentially microgrooved. In the speci?c embodi
in a groove of somewhat less than this depth and depend
ment shown, the groove takes the form of a helix having
ing upon the amount of spring back. The size of the
an axial pitch or spacing between grooves of about 128
groove, for practical purposes, is not readily measurable,
to the inch, so that the indicated distance is in the neigh
but production may be controlled by the use of an ordi
borhood of .008 inch. The groove itself may vary in 60 nary pro?lometer, even though the indicated groove depth
dimensions, but it has been found in practice that a groove
obtained from such an instrument may be a rather arbi
having a depth of about .002” or even less is satisfactory.
trary ?gure. For example, it has been found that a satis
A microgroove of this type does not disturb the desirable
factory bobbin surface will give a pro?lometer reading of
surface characteristics of the bobbin in any way and e?ec
4 ,
about 20-40 micro inches (R.M.S.), using a conical Stylus
pitch of the groove being a small multiple of the yarn
diameter and the depth and width of the groove being a
fraction of the yarn ‘diameter, the yarn thickness being in
ter reading of about 4 micro inches ' (R.M.S.)
a range from labout 15 denier to about 70 denier, the
Without [departing from the invention in its broader
aspect, the grooving may extend over the entire surface 5 groove spacing being about .008” and the groove depth
being in a range from about .0001" to .091".
of the bobbin, although preferably the end ‘areas upon
with .0005 radius tip, Where an ungrooved bobbin of simi
lar construction and surface material will give a pro?lome
which no yarn is Wound are left smooth and ungrooved,
as indicated in the drawing. '
What is claimed is:
A textile package comprising a bobbin and yarn wound 10
thereon, the bobbin having a yarn Winding surface com
prising a microgroove indented in the bobbin surface, the
References Cited in the ?le of this patent
Synder ________________ __ Jan. 6, 1925
Perry ________________ __ Feb. 17, 1942
Broadbent et a1 ________ __ Nov. 17, 1953
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