US3057576A - Compound spinning bobbin - Google Patents

Description

Oct. 9, 1962 c. SCAGLIA COMPOUND SPINNING BOBBIN i Filed March 11, 1960 2 Sheets-Sheet 1 s4 5 w 18q A 30 180.32 4 s2 2 Oct. 9, 1962 Filed March 11, 1960 C. SCAGLIA COMPOUND SPINNING BOBBIN 2 Sheets-Sheet 2 United States Patent F 3,057,576 COMPOUND SPINNING BOBBIN Camille Scaglia, Bremhilla, Italy, assignor to M. Scaglia,

Societa per Azioni, Brembilla, Italy, a joint-stock company of Italy Filed Mar. 11, 1960, Ser. No. 14,232 9 Claims. (Cl. 242118.6)

The invention relates to bobbins adapted for holding large quantities of yarn wound thereon. More particularly, the bobbins are adapted for having yarn of synthetic fibers wound thereon.

When winding synthetic fibers on bob-bins, there is caused high stresses on the bobbius flanges which may cause separation of the bob-bins flanges from the bobbins cores.

It is an object of the invention to provide a bobbin wherein the flange and core are assembled elements of different material but yet are inseparable under the pressure exerted by yarns of synthetic fibers When the same is wound on the bobbin.

It is a further object of the invention to provide a bobbin as above described and wherein there is provided means for preventing entry of yarn into fissures between the core and flanges caused by the pressure of the yarn against the flanges.

It is a feature of the bobbin according to the invention that yarn of synthetic fibers can be wound continuously on the bobbin without breaking and loss of yarn.

It is a further feature of the bobbin according to the invention that it is easily manufactured and economical to produce.

According to the invention the bobbin comprises a tubular core element and a flange element on and encircling the core element. Only one of the elements is metallic. The bobbin additionally comprises means for securing the flange element to the core element to resist forces applied to the flange element by yarn wound on the bobbin and means for preventing entry of the yarn on the bobbin into the fissure formed between the flange element and the core element when the flange element is deflected under the action of the force exerted by the yarn wound on the bobbin.

More particularly, the above-noted means are constituted by an annular projection on and integral with the core element and extending radially outwardly thereof. The projection includes an inner ridge extending perpendicularly from the core element radially outward. A plu rality of teeth are provided on the projection extending radially outwardly therefrom. The flange element is provided with indentations for accommodating the teeth on the projection. The inner face of the flange element is coplanar with the ridge when the teeth are enmeshed in the indentations. Furthermore, the outer face of the flange element is tapered in part to form a seat and the core element includes an end portion which is engaged in the seat such that the flange element is retained against movement longitudinally along the core element by the annular projection and the end portion.

The manufacturing procedure of the bobbin defined above is characterized by the following steps; a first series of shoulders is formed on both ends of the metal core; opposite seats are cut in the flange bores; both ends of the metal core are inserted into such bores; the jutting sec tions of the core edges are flanged to bring them into engagement with the seats formed on the flanges, and finally plugs of resilient material are forced into the core ends, wherein they are held by the spring reaction exerted by the core ends and by the associated flanges.

Several embodiments of the invention are shown in .the accompanying drawings, which embodiments are in- 3,057,576 Patented Oct. 9, 19 62 ice tended to be descriptive of the invention and are not to be taken as restrictive of the invention.

In the drawings:

FIG. 1 is a partial sectional side elevation view of one of the bobbin ends.

FIG. 2 is a partial sectional side elevation view of a bobbin section, in the process of manufacture.

FIG. 3 shows a partial sectional side elevation view of a further embodiment of the bobbin.

FIG. 4 shows the bobbin of FIG. 3, just before the flanges are secured to the core.

FIG. 5 is a view of the bobbin in FIG. 3 showing in detail the relationship between the flange and the core when the flange is subjected to stress by the yarn.

FIG. 6 shows the bobbin as seen in the direction of arrow VI of FIG. 5.

FIG. 7 is a vertical sectional view of apparatus for forcing the plugs into both bobbin ends.

The bobbin as shown in FIGS. 1 and 2, comprises a metal core A, preferably of aluminium or its alloys, Whereon the flanges B, of wood or like suitable material, are secured. The flanges are positively held on both core ends by peripheral projections 10, formed near the ends of core A.

Each flange B is provided with a bore 12, wherein the end 14 of core A is inserted as explained in more detail hereinafter. A seat 16 is formed in the inside portion of the bore 12 to accommodate the previously described shoulder 10. A further larger seat 18 (see FIG. 2) with a steep wall, is formed on the outer portion of the bore, to accommodate the flanged edge 20 (FIG. 1) of the core end 14. V Plugs C, of suitably resilient material, are forced, in the manner which will be described in more detail hereinafter, into both ends of core A. It has been found that wood is the most suitable material for the plugs with the fibers of the wood running parallel to the axis of core A. Consequently, the plug provides practically uniform elasticity in all different radial sections. The outside diameter of plug C should be slightly larger than the inside diameter of the bore 12 or the core A. An axial bore 22 is provided in plug C. Plug C has a leading edge 24 formed in one end thereof, while a peripheral slot 26 is cut in the opposite end.

The core A is preferably formed from a metal tube, and the flanges are machined preferably from wood.

The flanges B are secured to core A in the following manner: The flanges B are forced on both ends 14 of core A until the seat 16, on each flange is engaged against the shoulder 10, and the adjacent portion of the core periphery, as shown in FIG. 1. Thereafter, the edge of core end 14 is formed with a flange and brought into contact with the wall of seal 18 of flange B to tightly secure the flange B onto the end of core A.

The bobbin is then placed into a bush (see FIG. 7) constituted by two symmetrical portions 50 and 52, having ends with crowns 54 provided with suitable abutments 56 for accommodating the flanges B.

The bush 5052, with the bobbin inserted therein, is fitted on a base plate 60, by inserting one of the crowns 54 into a seat 58 formed on the base plate. A ring 62 formed with a seat 64, similar to seat 58, and adapted for accommodating crown 54 of the bush, is placed on the upper end of the bush. Thus, both halves 50 and 52 of the bush are secured together to firmly support the bobbin therebetween.

A crown 66 on the upper end of ring 62 is formed with a flared bore 68, which has a smaller minimum diameter than the inside diameter of the tapered portion 14 of core A. The plug C is inserted into the bore 68, and is then forced thereinto, by a plunger 70 provided with a reference pin 7-2 until the groove 26, around the plug pe 3 riphery, engages the annular projection on the core end 14.

The plug C, due to its inherent elasticity undergoes compression shrinkage when it is forced into the bore 68 of ring 62. When the bottom of bore 68 has been reached by the plunger 70, the plug C is wholly inserted into the bore of core A, and groove 26 is engaged with the annular shoulder on the core end 14. The plug, due to the elastic pressure forces the end portion thereof against the bore 12 of flange B, thus positively ensuring the connection between the core A and the flange B.

After having removed the ring 62, the half- bushes 50 and 52 can be disengaged from base plate 60, and the bobbin can be removed. The bobbin is then subjected to finishing operations. Thus, for instance, the sides of flanges B are turned and burnished, while the plugs C are anchored to core A by internings 28.

In FIGS. 3 to 6 there is shown a modified embodiment of the bobbin, wherein similar or equivalent components are given the same reference designations.

In the embodiment in FIGS. 3-6, the core A near its ends is formed with projecting ridges 30, the inside walls thereof being substantially normal to the axis of core A.

Both ends 32 of said core are knurled, as shown in FIG. 4. As in the embodiments in FIGS. 1 and 2, the ends of the core A are flanged and engage the wall of a seat 180, formed on the flanges B.

According to the invention, the upper ends of the peripheral projections 30 are formed with radial, or substantially radial serrations 34, adapted to mesh with a similar, complemental serration 36, formed on a portion of the bore of each flange B.

The above construction prevents, in a simple and eflicient manner, the yarn from being caught; in the fissure formed (as a consequence of the pressure exerted by the yarn wound on the bobbin) between the flange B and the core A. In the embodiment of FIG. 4, when the flange B is deflected, a discontinuous or zigzag fissure is formed between the flange and the core A, due to the presence of radial serrations 34 and 36, which prevents the yarn from entering into the fissure, even when they are pressed against the fissure by the superposed yarn layers.

The above bobbin is manufactured in like manner as the bobbin illustrated in the FIGS. 1 and 2.

It is to be understood that modification and changes may be made in the embodiments described, particularly with regard to the manner in which the flanges are secured to the core.

Similarly, changes might be made in the form and arrangement of the serrations without departing from the spirit of the appended claims.

What I claim is:

1. A bobbin comprising a tubular core element, a flange element having an opening and encircling the core element, only one of said elements being metallic, said flange element having an inner and outer face, an annular projection on and integral with the core element and extending radially outwardly thereof, said projection including an inner ridge extending perpendicularly from said core element radially outwardly, a plurality of teeth on said projection extending radially outward therefrom, said flange element being provided with indentations for accommodating said teeth, the inner face of said flange elements being coplanar with said ridge with the teeth in said indentations, the outer face of said flange element being tapered in part to form a seat, said core element including an end portion engaged in said seat, said flange element being retained against movement longitudinally along the core element by said annular projection and said end portion.

2. A bobbin comprising a tubular core element, a flange element having an opening and encircling the core element, said elements being of dissimilar materials only one of which is metallic, an annular projection of quadrilateral shape on and integral with the core element, the projection including a ridge extending perpendicularly from said core element in a radially outwardly direction, a plurality of teeth on said projection and extending radially with respect to the core element, said flange element being provided with indentations for accommodating said teeth, said flange element having a face which is coplanar with said ridge with the teeth in said indentations, said core element including an outwardly flaring end which defines a space with said projection, said flange element having a shape corresponding to that of said space and extending therein with said teeth engaged in said indentations so that said flange element is prevented from moving relative to said core element.

3. A bobbin as claimed in claim 2 comprising a resilient plug in the tubular core element, said plug urging said core element into contact with said flange element to lock said elements together.

4. A bobbin as claimed in claim 2 wherein said projection includes a further ridge facing said flaring end of the core element, said further ridge being inclined with respect to said core element so that said space is divergent radially outwardly.

5. A bobbin as claimed in claim 2 wherein said outwardly flaring end of the core element is knurled to provide increased resistance to relative movement between said flange element and said core element.

6. A bobbin as claimed inclaim 3 wherein said plug is normally larger than the tubular core element, said plug being compressed in said tubular core element whereby said plug exerts radial forces on said tubular core element.

7. A bobbin as claimed in claim 2 wherein said flange element is wood.

8. A bobbin as claimed in claim 2, wherein the core element has opposite ends and a flange element is at each end.

9. A bobbin as claimed in claim 2, wherein said teeth are of triangular shape.

References Cited in the file of this patent UNITED STATES PATENTS 898,398 Wood Sept. 8, 1908 1,700,593 Oliver Ian. 29, 1929 1,839,223 Jones Jan. 5, 1932 1,892,356 Mills Dec. 27, 1932 2,000,372 Beck May 7, 1935 FOREIGN PATENTS 500,530 Italy Nov. 19, 1954 777,289 Great Britain June 19, 1957 1,163,894 France May 5, 1958

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