U.S. patent application number 10/827758 was filed with the patent office on 2004-10-28 for pervious semi-rigid bobbin of molded plastics material for spools of yarn intended for treatments in dye works.
Invention is credited to Romagnoli, Tiziano.
Application Number | 20040211860 10/827758 |
Document ID | / |
Family ID | 32983183 |
Filed Date | 2004-10-28 |
United States Patent
Application |
20040211860 |
Kind Code |
A1 |
Romagnoli, Tiziano |
October 28, 2004 |
Pervious semi-rigid bobbin of molded plastics material for spools
of yarn intended for treatments in dye works
Abstract
On its cylindrical wall the bobbin has adjacent longitudinal
rows of holes (5) of substantially rectangular shape with the short
sides (5A) orientated circumferentially and the long sides (5B)
curving towards the inside of the hole, the holes in one row being
offset with respect to those in adjacent longitudinal rows in such
a way as to create undulating longitudinal linear structures (9)
between the longitudinal rows of adjacent holes (5); the curved
longitudinal edges of each hole can lie alongside each other in the
intermediate zone following uniform radial compressive stressing of
the transverse cross-section of the bobbin, while longitudinal
shortening of the bobbin is made easier.
Inventors: |
Romagnoli, Tiziano; (Prato,
IT) |
Correspondence
Address: |
MCGLEW & TUTTLE, PC
1 SCARBOROUGH STATION PLAZA
SCARBOROUGH
NY
10510-0827
US
|
Family ID: |
32983183 |
Appl. No.: |
10/827758 |
Filed: |
April 20, 2004 |
Current U.S.
Class: |
242/604 ;
242/118.1; 242/605 |
Current CPC
Class: |
D06B 23/045 20130101;
B65H 75/10 20130101 |
Class at
Publication: |
242/604 ;
242/605; 242/118.1 |
International
Class: |
B65H 075/18 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 22, 2003 |
IT |
FI2003U000045 |
Claims
What I claim is:
1. An injection molded bobbin of plastics material for the
formation of spools of yarn wound into turns on it for processing
especially in dye works and subsequent unwinding of the yarn,
wherein the cylindrical wall of said bobbin has adjacent
longitudinal rows of substantially rectangular holes with the short
sides orientated circumferentially and long sides curved inwards
towards the hole, and having the holes in one row offset with
respect to those in adjacent longitudinal rows in such a way as to
create undulating longitudinal linear structures between the
longitudinal rows of adjacent holes as a result of which the curved
longitudinal edges of each hole can lie alongside each other in the
intermediate zone following radial compression stress bringing
about a substantially uniform reduction in the transverse
cross-section of the bobbin, while longitudinal shortening of the
bobbin is made easier as a result of the undulation in the said
linear structures.
2. Bobbin according to claim 1, wherein the holes in the adjacent
rows are offset by approximately half a step.
3. Bobbin according to claim 2, wherein the ends of each bobbin
have shapes which are capable of ensuring both mutual centering
between axially superimposed bobbins and the formation of a space
between the opposite surfaces in order to receive the turns of the
stock yarn.
Description
[0001] Bobbins of injection molded plastics material, with
perforations so as to render the tubular walls pervious, are also
used for treatments in dye works where these bobbins--with the
wound spool on them--are subjected to specific stresses, in
particular centripedal radial stresses due to the shrinkage which
the yarn undergoes during the dyeing treatment. This gives rise to
a reduction in the transverse cross-section of the bobbins and also
considerable longitudinal elongation which causes complications
during the processing stages to which the bobbin is subjected. For
this reason it is desirable to have control over the length of the
bobbin.
[0002] In a previous patent (Utility Model No. 247,836, filed on
Mar. 26, 1999) provision was made for a bobbin which had adjacent
longitudinal rows of rectangular or square holes on its cylindrical
wall with the holes in one row offset with respect to those in
adjacent longitudinal rows in such a way that the longitudinal
edges of each hole can be brought near to each other in the
intermediate zone as a result of centripedal radial compression
stresses, bringing about a substantially uniform reduction in the
transverse cross-section of the bobbin; longitudinal shortening of
the bobbin is virtually impossible, especially when cold and
without simultaneous radial restriction.
[0003] This invention avoids these disadvantages and offers other
advantages which will be apparent from a reading of the following
text.
[0004] The invention relates to a bobbin of injection molded
plastics material for the formation of spools of yarn upon it wound
into turns particularly for treatments in dye works and subsequent
unwinding of the yarn, the bobbin having adjacent longitudinal rows
of holes of substantially rectangular shape along its cylindrical
wall with the short sides orientated circumferentially and the long
sides curved towards the interior of the hole; in addition to this
the holes in one row are offset with respect to those in adjacent
longitudinal rows in such a way that the longitudinal linear
structures between the longitudinal rows of adjacent holes are
undulating. In this way the curved longitudinal edges of each hole
can approach each other in the intermediate zone following radial
compression stress. This makes possible a substantially uniform
reduction in the transverse cross-section of the bobbin as a
consequence of the centripedal radial stresses, while longitudinal
shortening of the bobbin can easily be controlled, this being
encouraged by the undulating shape of the longitudinal linear
structures located between adjacent rows of holes.
[0005] The drawing shows one possible embodiment and in
particular:
[0006] FIGS. 1 and 2 show the bobbin in question in side view in
partial cross-section, in its original configuration and in the
configuration deformed after use,
[0007] FIGS. 3 and 4 show two magnified details in FIG. 1, and
[0008] FIG. 5 shows a detail of the manner of axial coupling
between superimposed bobbins.
[0009] As illustrated in the appended drawing, a bobbin 1 has in
its upper part a contact surface 1B from which there extends a
small step 2B followed by the annular terminal zone of cylindrical
surface 2 terminating at 2A. One or more relatively slender slots
3, with an orientation slightly inclined with respect to the
circumference, are provided in cylindrically shaped zone 2: the
slot or slots are defined by outer edges 3A and 3B which incline
towards slot 3. Slots 3 and edges 3A and 3B are slightly inclined
so as to extend in such a way that they are present over almost the
full height of terminal cylindrical zone 2, this zone 2 being
designed to receive the turns of the stock yarn. An inner wall 4
defining an intermediate space I within terminal cylindrical zone 2
extends from upper extremity 2A. Reinforcing rings may be provided
in intermediate space I between its opposite surfaces.
[0010] Upper terminal cylindrical zone 2 serves to receive a
particular number of turns of yarn S indicated in FIG. 5 and
indicated diagrammatically and only in part in FIG. 4. At slots 3
and inturned edges 3A and 3B with terminal connections 3C the
aforesaid turns are caused to penetrate and concentrate in slot or
slots 3 until they come into contact with an inner wall A, and may
also be slightly deviated from walls 4 halfway along each of slots
3. Penetration of turns S into slots 3 ensures that the turns of
stock yarn S are retained to prevent the possibility of the complex
of these turns of stock yarn becoming undone during the handling
suffered by the bobbin when the spool of yarn specifically
comprising the portion of stock yarn constituted by turns S is
formed on it. In addition to this it is easy to remove this yarn
from slots 3 when acting on the end of the stock yarn in order to
carry out the operations necessary for use of the yarn.
[0011] In order to ensure axial positioning between superimposed
spools and space for the turns of stock yarn S on the outer surface
of terminal cylindrical zone 2, bobbin 1 is shaped internally at
the base 1E (see FIGS. 1, 2 and 4) with a stepped surface 1F. In
this way, when two bobbins are superimposed (see also in particular
FIG. 5) the terminal edge 1G of base 1E of overlying bobbin 1 is
supported on the contact surface 1B of bobbin 1 underneath, but
surface 1F of the overlying bobbin is almost in contact with the
surface of terminal zone 2 of the bobbin beneath, step 2B ensuring
mutual centering of the two superimposed bobbins. This also ensures
sufficient space between the surface of zone 2 of the bobbin
beneath and stepped inner surface 1F of base 1E of the overlying
bobbin to prevent any forcing and deviation of the turns of stock
yarn S which are wound onto the surface in upper cylindrical zone 2
of the overlying bobbin when the bobbins are mounted one above the
other.
[0012] The central zone intended for winding of the spool of yarn
is permeable because of the presence of a plurality of longitudinal
rows of holes 5, each of which holes 5 has a shape lying within a
rectangular outline. More particularly each hole 5 is defined by
two transverse straight short sides 5A and two curved long sides 5B
of opposing convexity; short sides 5A of adjacent holes 5 in one
longitudinal row of holes define a segment 7 which corresponds
substantially to the center of convexity of the curved side 5B of
the holes in adjacent rows of holes, the holes in each row being
offset by one half step; in other words transverse segments 7
separating holes 5 in each longitudinal row from each other
correspond to the intermediate length of curved longitudinal side
5B of holes 5 in the adjacent rows. In order to obtain a half-step
shift in holes 5 in one row in comparison with those in adjacent
rows, alternate rows have at their ends an upper hole 5X and a
lower hole 5Y of very much smaller longitudinal dimensions.
[0013] The shape of the central zone of the bobbin is therefore
uniformly permeable with circumferential alignments defined by
segments 7 alternating with spaces lying between the central
projections of the curvature of sides 5B of adjacent holes 5, while
the longitudinal rows of holes 5 are separated by undulating
longitudinal linear structures 9 defined by the curved sides 5B of
circumferentially adjacent holes 5.
[0014] Both undulating linear structures 9 and transverse segments
7 are relatively slender.
[0015] With this arrangement a structure is obtained which is
firstly very permeable in the zone of the central cylindrical wall
of the bobbin having holes 5, with the advantage of the uniformity
which is effectively achieved when dyeing with liquids which pass
through holes 5 from the interior of the bobbin and the mass of
yarn wound onto the bobbin in turns. Secondly the structure
described is sufficiently rigid and light, with the advantage of
requiring a limited quantity of material for formation of the
bobbin, for the same strength and rigidity. Thirdly, in the course
of the treatment which it undergoes when handling the wound thread
and in particular during dyeing treatment, the bobbin in question
offers the possibility of easier longitudinal yielding than
previously known bobbins having a different hole shape, offering
the possibility of reducing the diametral dimensions of the bobbin,
before treatment of the yarn wound onto it as well, through
stresses caused particularly by the shrinkage which the yarn in the
spool wound onto the bobbin undergoes during dyeing treatments. In
fact longitudinal linear structures 9, which are slightly
undulating, also encourage longitudinal yielding when cold and
therefore axial shortening of the bobbin, as well as encouraging
restriction of the cross-section of the bobbin in a radial
direction during dyeing treatments.
* * * * *