US2019952A - Shuttle bobbin and method of making the same - Google Patents

Description

Nw., 5, w35 C. E. CHAFFIN y www SHUTTLE BOBBIN AND METHOD OF MAKING THE SAME Filed April 10,' 1954 INVENTOR, .fezfem ATTORNEY.

Patented Nov. 5, 1935 l' UNITED STATES SHUTTLE BOBBIN METHOD F MAKING T HESAME Clarence E. Challin, Sprinsleld, Mass.

Application April 10, 1934, Serial N0. 719,944

This invention relates to improvements in shuttle bobbins, and the method of making the same.

By the term shuttle bobbin, it is to be under- 5 stood as referring to the wound spools of thread that are used in the 'shuttle of a sewing machine, usually of the rotary shuttle type, or of the oscillating type.

An object of., the present invention is to provide l0 a shuttle bobbin that is constructed entirely of paper, thus lessening the expense of the article and improving it in other ways.

A further object is to provide a shuttle bobbin, in which the disc-shaped paper ends are formed with reinforcing ribs, or spokelike construction,

for providing a. frictional resistance in the shuttle of the machine, when idling, and also to lessen, or prevent, back lash.

A further object is to provide the ends of the shuttle bobbin with a double thickness of paper, for the purpose of providing. stiffer and stronger side walls, whereby the two ends will hold, or retain their shape very much better.

A further object is in the manner of attaching the ends, or discs, to the paper core, by means of glue-covered tabs which are an integral part y of one of the layers of the disc and are located, or projected, into the opposite ends of the paper core and before the moisture on the glue-covered tabs has had time to dry, after -being moistened by any suitable means. Y A

A further feature of my invention is in using the two layers, or strips, of paper, for building up the end discs, one having glue, or other adhesive substance on one surface and the other strip without any adhesive on either of its sur- 4 faces. The two strips, one of which is provided with spaced openings, are then attached, or secured, to each other, after first moistening the glue-covered strip. A suitable punch is next moved against the gummed strip, and through an opening on the plain strip, to pierce the gummed strip and at the same time, form a plurality of gummed tabs, which tabs are then, while still moist, moved against the inner surface of the paper core with this punch, or tool. The result of this operation is to quickly and rmly secure the end discs of paper, having a double thickness, to the ends of the paper core. This operation on the shuttle bobbin prevents any of the glue from coming into direct contact with the wound thread on the core: it being understood that the core has 'first been wound before the end discs of paper are attached thereto.

A further object of the ribbed discs is to prevent the possible spilling of the threadinside of the shuttle bobbins case, when the thread is being used, or drawn off from the bobbin. The ribs, or spokelike structure of the discs also provide spaces, or recesses, on their inner surfaces, 5

into which the mass of vthread is moved, after the end discs have been attached to the opposite ends of the cor'e, when pressure is applied to the attached discs, by means of dies having depressions therein. This last operation serves to produce l@ a shuttle spool -of the desired length, or thickness. Another feature of the ribbed, or stiffened discs, is to cause them to always remain at .right angles to the axis of the core.

The invention, briefly, is to first wind the 15 thread on a paper, or other core, with the mass of thread terminating near the opposite ends of the core; next, securing together the two strips of paper, one of which is gummed, and the other is provided with spaced openings; next', forming 20 discs out of the two layers of paper, then forming tabs in the gummed strip of the disc and projecting and pressing the tabs into the opposite ends of the core for securing, or attaching, the discs to the ends of the core and, next, forming the a ribs or spokelike surfaces on the two end discs, by compressing the mass of thread and the core,

in order to produce a nished article of the right. dimensions, as will be fully described.

Referring to the drawing: 30

Fig. 1 is an end view of the nished shuttle bobbin, showing the ribs, or spokelike structure, onV one of the end discs.

Fig. 2 is a side view of Fig. 1.

Fig. 3 is an enlarged, detail, sectional view of 35 the nished shuttle bobbin, showing the gummed means for securing the end discs to the core.

'Fig. 4 indicates a strip of ungummed paper ,formed with the equally spaced openings.

Fig. 5 is a strip of paper that is gummed on 40 one of its surfaces.

Fig. 6 illustrates the two paper strips, showny in Figs. 4 and 5, after being secured together with the adhesive, which shows through the 45 openings in the ungummed strip.

Fig. '1 illustrates the openings in two strips of paper, after several of the end discs have been punched, or removed therefrom.

Fig. 8 shows one of the two ply paper discs 50 with the adhesive on one disc showing through the opening of the ungummed disc.

Fig. 9 is an enlarged, sectional view on the line 9-9 of Fig. 8, showing the adhesive between the two layers.

Fig. 10 shows the gummed strip, after being slitted to form the tabs.

Fig. 11 shows the gummed tabs projected through the opening of the ungummed disc.

Fig. 12 is a View, showing the implement, or punch, in position for slitting the gummed strip, after one of the discs, shown in Figs. 8 and 10, have been placed on the end of the wound core.

Fig. 13 shows the punch, after slitting the gummed strip to form the tabs and moving the gummed tabs into the end of the core for securing the disc to the core, and

Fig. 14 shows the two dies for forming the radial ribs, or spokelike structure in the discs, and for compressing the mass of wound thread, in order to produce a finished article of the 4correct size, or length.

Referring to the drawing in detaik- I indicates the finished shuttle bobbin having the wound thread 2, known in the art as universal-winding. The oppositely located end pieces, or discs, are indicated at 3 and 4, which are formed with the raised, radial ribs, or spokelike elevations 5, and raised circular part 5", it being understood that both of the discs 3 and 4 are formed with these ribs, or spokelike elevations and the raised, circular portion 5".

Referring now to the detail construction cf the discs 3 and 4, both of which are alike, these discs are formed with two thicknesses, or layers, of paper, and are built up, or made, as follows: 5 indicates a strip of ungummed, or plain paper, of suitable quality having the equally spaced circular openings 6 along its center line. 1 indicates a strip of paper of the same width as 5 having applied to one of its surfaces the glue, or adhesive, indicated at 8. Suitable means is provided for moistening the adhesive and then the f two strips are secured together by suitable mech,-

anism, not shown, for producing the article, shown in Fig. 6, which comprises a strip of paper of double thickness. 'I'his built-up strip is then subjected to a punching process which cuts out, or removes the discs 9, shown in Fig. 8, and an enlarged view in Fig. 9. The openings I0 in Fig. 7 indicate the removal of the discs 8. Next, one of the discs, shown in Fig. 8, is placed on the wound core I2, as shown in Fig. 12, against the thread 2. A suitable punch, or tool I2', having the sharp edges I2", is passed through the openings 6 for engaging the reverse, or ungummed, side of the gummed surface 8 of the strip T, as shown in Fig. 12, in order to slit the same to form the tabs I I, four of which are shown in Fig. 10. The tool I2', of the arrow, not only forms the tabs II, but moves them into the inside of the core I2, and forces them into clos'e contact with the inner surface of the core, so that they can adhere thereto, as shown, in Fig. 13. In Fig. 11, the gummed tabs II are shown projected above the inner surface of the disc 9, as indicating their position, when inserted in the ends of the core I2. tached to the opposite ends of the core and thread, the two die members I3 and I4, preferably heated, having the circular projections I5 and I6, and depressions I'I, circular depressions 5" and inclined surfaces I8, are moved in opposite directions, as shown by the arrows I9 and 20, in Fig. 14, towards the opposite ends of the mass of wound thread 2. The projections I5 and I6 will enter the opposite ends of the core and engage the gummed tabs II. 'I'he die members I3 and I4 operate to compress the mass when moved in the direction After the two end discs have been atof wound thread, 2, to form the finished shuttle bobbin of Fig. 2, of the desired length. The thread, at the ends of the core, is also moved into the depressions, into the ribs, or spokelike portions 5 and circular portion 5". This construction lessens, or retards, or largely overcomes, the back lash, when the shuttle bobbin is in use. The inclined surfaces I8 of the die members I3 and I4 will forn the inclined, inwardly bent edges 2I of the nished discs. The adhesive 1, between the two layers of the end discs. serves to materially strengthen the end discs and assists in retaining their permanent shape.

It should be observed that the integral, annular, gummed portion 22, (see Figs. 3 and 11) of the gummed strip 1, which is formed by spacing the points at the bottoms of the recesses between the V-shaped tabs I I, from the plane of the inner surface of the disc 9, will serve to materially strengthen the discs 3 and 4 and the ends of the core I2. As shown, the length of this annular, integral portion 22 is substantially, but not necessarily, equal to the length of the V-shaped tabs I I.

It is to be understood that I do not limit myself to the use of paper exclusively, as I may, if desirable, use other suitable material.

It should be stated that I do not confine myself to the idea of attaching, or securing, one end disc at a time to the core, as described, but I may, if desired, attach both of the discs at the same time.

What I claim is:-

l. A shuttle bobbin comprising, a paper core member and end discs composed of flexible material and having a plurality of plies, one of the plies of each of the discs having an opening and the other a plurality of gummed tabs projecting through the opening and located within the core.

2. The method of producing a shuttle bobbin having a core and end discs which consists in rst winding the thread on its core, then forming disc members each with two layers of flexible material, one of the layers having an opening, the other layer having an adhesive thereon for securing the two layers together, then, forming tabs in the adhesive layer at the opening in said layer,

then, placing one of the discs on each end of the core, then, passing an implement through the openings in the discs for forming and moving the gummed tabs against the inner surface of the core, whereby the discs are permanently secured to the core, then, subjecting the wound thread on the core for compressing to the desired thickness.

3. A method for forming discs of paper which consists in providing two strips of paper one having an adhesive on one of its surfaces and the other without any adhesive thereon but with spaced openings therein, then, moistening the gummed strip and securing the ungummed strip thereto, then cutting discs from the combined strips, then forming tabs in the gummed portion of said discs where they are exposed through the openings in the ungummed portion.

4. A shuttle bobbin comprising, a core member, end discs composed of a plurality of layers of paper one of the layers having gummed tabs which are located in the ends of the core and which serve to retain the layers on the ends of the core, said discs having elevations and depressions therein.

5. As a-n article of manufacture, an end piece 0r disc for shuttle bobbins, said disc being composed of two layers of paper one of the layers having an opening, the other layer having an 75 adhesive on one of its surfaces, V-shaped tabs formed in the layer having the adhesive and which tabs project beyond the inner surface of the non-adhesive layer, the bottoms of the recesses between the V-shaped tabs 'terminating at points that are spaced from the piane of the inner surface of the disc whereby, an annular strip of strengthening material is formed.

6. As an article of manufacture, a disc mem? ber composed of layers of paper which are coextensive with each other and with an adhesive therebetween, one of the layers having an opening and the other a plurality of gummed tabs.

7. The method of producing a shuttle bobbin having a core and end discs, which consists in rst winding the thread on its core, then forming disc members each with two layers of exible ma.- terial, one of the layers having an opening, the other layer having an adhesive thereon for securing the two layers together, then placing one of the disc members on each end of the core, then, passing an implement through the openings, in the discs, for forming and moving gummed tabs against the inner surface of the core, whereby the discs are permanently secured tothe core.

8. Steps in the method for forming a unitary disc of paper which consists in-providing strips of paper one having an adhesive on one of its surfaces and another without any adhesive thereon but with spaced openings therein, then, mois- 5 tening the gummed strip for securing the ungummed strip thereto, then forming a disc from the combined strips, then, forming tabs in the gummed portion of said disc where it is exposed through the opening in the ungummed portion of said disc.

9. A shuttle bobbin comprising, a core member and end discs secured to the core, the discs having tabs with adhesive thereon which enter the core for securing the discs to the core and an adhesive ring portion formed as an integral part of the tabs that engages the ends of the core for strengthening purposes.

10. As an article of manufacture, a disc member composed of a plurality of flat co-extensive layers of paper with an adhesivetherebetween,

one of the said at layers of paper having an opening and another having a plurality of gummed tabs projecting through the opening.

CLAREN CE E. CHAFFIN.

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