US2775091A - Attachment for textile bobbin - Google Patents

Description

1956 LA VERNE R. GRAYBEAL ET AL $175,091

ATTACHMENT FOR TEXTILE BOBBIN Filed April 10. 1955 J if 2 Sheets-Shem 1 INVENTOR DONALD J. EDGAR LAVERNE R.GRAYBEAL ATTORNEYS Dec- 1956 LA VERNE R. GRAYBEAL ETAL 2,775,091

ATTACHMENT FOR TEXTILE BOBBIN Filed April 10; 1953 2 Sheets-Sheet 2 IN V EN TORS.

DONALD J. EDGAR ATTACHMENT FOR TEXTILE EOBBIN La Verne R. Grayheal and Donald J. Edgar, Elizabethton, Tenn, assignors to North American Rayon Con poration, New York, N. Y., a corporation of Delaware Application April 10, 1953, Serial No. 348,002

4 Claims. (Cl. 5734) The present invention relates to an attachment for a textile spool or bobbin of a ring twisting machine, and more particularly relates to an attachment for such bobbins to permit yarn packages to be produced having a magazine wrap or transfer tail.

In spinning packages of yarn from a continuous supply of artificial filamentary material such as rayon it is desirable to provide a short length of yarn at the beginning of the winding and twisting operation which is freely accessible and of usable quality after the bobbin or spool has been filled. Such a piece of yarn is commonly referred to in the textile art as a transfer tail and is used for securing directly to the outer end of another yarn package for the purpose of effecting a smooth transfer from a depleted bobbin to a full yarn package with out necessitating any interruption in the delivery of the yarn in creeling operations and the like.

Patent 2,431,323 discloses a method for starting thread on ring twister bobbins, with the parts being so constructed and arranged as to provide a short extension of the inner Winding of yarn for transfer purposes. The present invention envisions the use of the starting up method described in this patent. However, the pres ent invention provides means for holding the free end of the transfer tail with a firm but easily detachable grip with means being also provided for severing the yarn extending beyond the point of attachment.

In the patent referred to, the yarn is drawn through a groove or slot in the lower flange of a vertical ring twister bobbin and is allowed to wind around a concentric extension underneath the lower flange of the bobbin. However, in cases where relatively large bobbins are employed for heavy yarn packages the length of yarn or thread wound around the concentric exten sion tends to take a position tangent to the extension when the bobbin is in rotation. Due to the great centrifugal force, the amount of yarn on an increased diameter extension of the type to which the present invention is directed produces certain difliculties which our invention overcomes. When the transfer tail of the prior patent referred to is thrown beyond the outer periphery of the lower flange of the bobbin due to centrifugal force, it will strike the twisting ring and wipe off the lubricant therefrom, or it will tend to strike some part of the framework of the machine and thereby cause the transfer tail to become frayed and produce lint which pollutes the air and collects on the machines.

Various attempts have been made in the past to obviate this undesirable condition but none of these have proven entirely satisfactory for various reasons. One approach to a solution of the problem resides in the use of means for causing the ring to descend below the lower flange of the bobbin during the first several revolutions thereof so as to wind a transfer tail of several turns of yarn around an extension depending from the lower flange of the bobbin, after which the ring is returned to its normal path of reciprocation, either automatically or manually, with the leading end of the yarn being again returned through the slotted flange so as to be wound on the barrel of the bobbin. Due to the complicated and expensive nature of the mechanism usually required for modifying the path of travel of the traverse bar and ring this approach to a solution is not particularly desirable.

Attempts have also been made in the past to provide friction catches on the lower face of the bottom flanges of the spinning bobbin to catch and hold the transfer tail, but due to the fact that a separate manipulative step is often required in utilizing this added feature, these prior art devices have likewise been found lacking, particularly since such catches failed in their purpose after a short period of use.

it is therefore a principal object of the present invention to provide an attachment for a spinning and twisting bobbin which is simple in design and inexpensive but which is highly efficient in operation and which does not require any additional manipulative steps by the operator beyond the starting-up method set forth in U. S. Patent 2,431,323 previously referred to.

A further object is to provide means whereby the free end of the yarn transfer tail is clamped in a fixed position throughout the period of running time necesary to fill the bobbin, so that the free end of the transfer tail is prevented from extending beyond the outer periphery of the flange of the bobbin, thereby protecting the ring and traveler of the twister from the wiping action which occurs whenever the free end of the tail is permitted to contact these elements.

A still further object is to provide an attachment for a spinning or twisting bobbin whereby a transfer tail is provided of the same quality as that being thrown on the barrel of the spool and having the length thereof predetermined and substantially equal for all of the bobbins.

These and further objects will become apparent and understood from the description of the drawings and the claims which follow.

In the drawings:

Figure 1 is a slightly enlarged detail view showing the preferred form of cutting clip attachment according to the present invention with the various elements thereof disassembled.

Figure 2 shows an end view of a spinning and twisting bobbin with the attachment of the present invention shown secured thereto.

Figure 3 is an enlarged fragmentary elevation showing the position of the thread directing and gripping pad member with respect to the bobbin flange.

Figure 4 is a bottom plan View of the underside of the clip member showing the cutting edge thereof.

Figure 5 is a perspective view of a modified clip member.

Figure 6 is an end view similar to Figure 2 showing the modified clip member in position.

Figure 7 represents a slight modification of the attachment shown in Figure 5 and Figure 8 is a longitudinal fragmentary elevation showing the modified attachment of Figure 5 in position on the bottom flange of a bobbin.

Referring now to the drawings in more detail, the numeral lltl generally designates a spinning bobbin of the type to which the present invention is particularly adapted for use. The bobbin it] comprises an upper flange (not shown) connected to the lower flange 14 by means of the barrel 12 (Fig. 8). Depending from lower flange i4- is the concentric hub extension 16 which is flared outwardly from its point of attachment to the flange 14. The hub extension 16 is provided with slots 18 for driving engagement with a whirl (not shown). In other respects the arrangement and operation of the bobbin 10 is substantially as set forth in the aforesaid U. S. Patent No. 2,431,323.

The lower flange 14 of bobbin 10 is provided with the slot or groove 20 extending substantially at right angles to the barrel 12 and terminating at the point of attachment of the depending concentric hub extension 16.

. The preferred embodiment of the present invention is shown in Figs. 1 through 4, and comprises a cutting clip attachment 22 adapted to be secured to the bottom face of the lower flange 14 adjacent to slot 26 and tangentially to the outer circumference of the hub extension 16. The attachment according to the preferred embodiment, is comprised of a substantially flat section 24 of resilient material having one end 26 thereof extending at substantially right angles to the portion 24. The right angled portion 26 has one side thereof slightly recessed as shown at 28 (Figs. 1 and 4), and this recessed portion is provided with a cutting edge the function of which will be more fully described subsequently.

A resilient pad 34), which may conveniently be fabricated from felt or rubber, is firmly held beneath the portion 24 by means of screw 32 which extends through the holes 33 and 33' provided in the clip and pad. Pad 30 has the rolled free end 34 thereof extending at substantially right angles to the portion 24 of the clip member 22. To prevent displacement from its position on the bobbin a second screw 36 is provided to secure the attachment to the bobbin through the hole .37.

The portion 34 of the pad 30 acts to direct the thread or yarn beneath the pad 30, where the thread is gripped between said pad and the bottom surface of the flange 14.

In the embodiment shown in Figs. through 8 the pad member 30 is omitted and the resiliency of the clip attachment 38 is relied upon to provide the necessary gripping contact with the thread or yarn disposed beneath the clip. In this embodiment the attachment indicated generally at 38 is constructed from a material such as spring steel and is fabricated so as to produce the thread directing tongue portion 40, bowed portion 42, flat portion 44 and right angled portion 46 having the recess 48 cut in one side thereof. The recessed portion 48 is beveled at 47 (Fig. 5) to provide a cutting surface for the thread or yarn. This embodiment is attached to a bobbin by means of the holes 50 and 51 and the screws 50 and 51 as in the case of the preferred form. The position of this modification on the bobbin is substantially the same as previously described, except in this form, clip member 38 is a little longer and extends slightly beneath the flared portion of hub extension 16 as seen in Fig. 6.

In both embodiments of the invention the right angled portions 26 and 46 of the clip members 22 and 38 respectively fit into suitable slots prepared for the purpose in the underface of the lower flange of the bobbin. This arrangement holds the clip firmly against displacement and also presents the cutting edge in proper position to sever the excess yarn.

in Fig. 7 the thread directing tongue portion 40 is shown as slightly elongated and the bowed portion 42 slightly reduced in length. This modified form illustrates the changes in the form of construction which are possible to adapt the invention to the particular type yarn and denier being worked with. In the modified form of the invention the clip is provided with one or more pressure points between the clip and bobbin to insure a firm grip on the yarn tail.

Since the operation of both modifications of the invention is substantially the same the mode of using the present invention will be described as applicable to both modifications.

U. S. Patent 2,431,323 describes the steps of starting thread or yarn on a ring twister bobbin and this procedure can be employed in connection with the present invention Without further manipulative steps being re quired on the part of the operator. The leading end of the. yarn is lead through the ring and traveller and is directed around the hub portion 16 of the bobbin It as rotation of the bobbin is commenced. The free end of the yarn, after winding about one turn around the hub extension, is directed by the portion 34 of the preferred form, and by the tongue portion 40 in the modified form, to the thread gripping area beneath the pad 30, or the pressure points of the modified clip member 38, with any yarn extending beyond the position of the clip being efficiently severed automatically by the cutting surfaces on right angled portions 26 of the preferred form and 46 of the modification, as the bobbin commences normal rotation. Slot 20 leads the oncoming thread from the hub extension of the bobbin to the barrel portion 12. After the excess transfer tail is clipped, normal winding and twisting proceeds until the bobbin is filled and ready for dofiing.

The position of the cutting clip attachment can be varied on the bobbin depending upon the denier and origin of the yarn being twisted. However, in the twisting and winding of high denier yarn of cellulosic origin wherein large packages are built up with long dofling times, it has been found that the attachment (both forms) operates most efliciently when positioned as shown in the drawings, as advantage is taken of the position assumed by the free end of the transfer tail under the centrifugal force produced by high winding speeds. The transfer tail becomes gripped and severed almost automatically as rotation of the bobbin is commenced after following the threading steps set forth in the method of Patent No. 2,431,323.

While the preferred clip is shown as being of different form from the modification, it should be pointed out that the configuration shown in Figs. 58 can be used with the pad of Figs. 1-4 if desired, but since the modification is fabricated for use without the pad member 30, the form shown in Figs. 14 is preferred due to its simplicity of construction.

It should be pointed out also that the thread gripping and directing pad of the preferred form can be fabricated in one piece from rubber or other such moldable material in which case the rolled portion would be made solid. Also to provide complete insurance against displacement of the pad portion, it can be fabricated with a ribbed or rolled portion on each side of the holding clip, so that twisting of the pad becomes impossible.

While the cutting edge of the clip has been described as slightly recessed, a straight edge has been found to function satisfactorily in the preferred form.

To compensate for the weight of the clip attachment, a small portion of the bobbin flange can be removed to prevent an unbalanced condition. This removal can conveniently be effected adjacent to the free end of the clip, so as to serve a double function in aiding in the removal of the yarn transfer tail.

While the present invention is simple in construction it has been found to be extremely effective in use and has the advantage that existing spinning and twisting bobbins can be modified according to the present invention at a very small cost without in any way affecting the other parts of the equipment or requiring further manipulative steps on the part of the operators.

It is to be understood that further modifications are possible without departing from the scope of the present invention.

We claim:

1. A transfer tail holder and cutter for textile yarn wound onto a spool having a barrel and a flange secured to the bottom of said barrel, a hub extending from the bottom of said flange, said flange having a radially extending slot formed therein, the improvement comprising resilient clamping means for clamping the yarn transfer tail against the bottom surface of said flange, said resilient clamping means being oriented to face in a direction away from said slot so that said yarn transfer tail emerging from said slot to the under side of said flange may be wound around said hub and then clamped by said resilient clamping means, and means having a sharp edge positioned between said clamping means and said slot so that the free end portion of said yarn transfer tail may be severed from the clamped portion thereof.

2. A transfer tail holder and cutter for textile yarn wound onto a spool having a barrel and a flange secured to the bottom of said barrel, a hub extending from the bottom of said flange, said flange having a radially extending slot formed therein, the improvement comprising a clip member, means for attaching said clip member to the bottom of said flange adjacent to said slot, said clip member having resilient clamping means for clamping the yarn transfer tail against the bottom surface of said flange, said resilient clamping means being oriented to face in a direction away from said slot so that said yarn transfer tail emerging from said slot to the under side of said flange may be wound around said hub and then clamped by said resilient clamping means, said clip member having a sharp edge positioned between said resilient clamping means and said slot so that the free end portion of said yarn transfer tail may be severed from the clamped portion thereof.

3. A transfer tail holder and cutter for textile yarn wound onto a spool having a barrel and a flange secured to the bottom of said barrel, a hub extending from the bottom of said flange, said flange having a radially extending slot formed therein, the improvement comprising a clip member, means for attaching said clip member adjacent to said slot, resilient clamping means comprising a compressed pad held on the bottom surface of said 3 flange by said clip member, said pad clamping the yarn transfer tail againstthe bottom surface of said flange, said resilient clamping means being oriented to face in a direction away from said slot so that said yarn transfer tail emerging from said slot to the under side of said flange may be wound around said hub and then clamped by said pad, said clip member having a sharp edge positioned between said pad and said slot so that the free end portion of said yarn transfer tail may be severed from the clamped portion thereof.

4. A transfer tail holder and cutter for textile yarn wound onto a spool having a barrel and a flange secured to the bottom of said barrel, a hub extending from the bottom of said flange, said flange having a radially extending slot formed therein, the improvement comprising an elongated resilient clip member, means for attaching said clip member to the bottom surface of said flange adjacent to said slot, said clip member having one end thereof bent away from the surface of said flange to facilitate the clamping of the yarn transfer tail against the bottom surface of said flange, said last mentioned end of said clip member being oriented to face in a direction away from said slot so that said yarn transfer tail emerging from said slot to the under side of said flange may be wound around said hub and then clamped by said clip member,'

said clip member having a sharp edge for severing the free end portion of said yarn transfer tail from the clamped portion thereof.

References Cited in the file of this patent UNITED STATES PATENTS 621,218 Burr Mar. 14, 1899 964,084 Boswell July 12, 1910 1,811,352 Feugill et a1 June 23, 1931 2,261,239 Elvin et al. Nov. 4, 1941 2,582,696 Haythornthwaite Jan. 15, 1952

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