US1643360A - Shuttle - Google Patents

Description

spt" R. N. ALLEN SHUTTLE Filed June 11, 1924 2 Sheets-Sheet 1 I N VEN TOR.

W ATTORNEY.

Se t. 27, 1927.

R. N. ALLEN "SHUTTLE Filed June 11. 1924 2 sums-sheet 2 a I INVENTOR.

. A TTORNY.

Patented Sept. 27, 1927.

warren srarss rum? {eerie-E.

ROBERT: 1v. ALLEN, or Marianna Messaciiusririrs} ASSIG1\I OR"TQ U.'S; romaine SHUTTLE 00., or PROVIDENCE, arrenarsrniw, acea-roanrron open-one ISLAND.

SHUTTLE.

Application filed June 11, 1924. Serial No. 719,318;

My invention is an improvement in shuttles, particularly of the self threading type for weft replenishing looms. It is particularly adapted for those having a metallic threading b'lock positioned on the side of the eye and extending over into the threading chamber in a direction which corresponds with the normal unwinding path of the yarn as it unwinds from the bobbin.

It is an improvement on the type of shuttle shown in patents to Snow of June 29, 1920, No. 1344,73 1, and of Feb. 22, 1921, No..1,369,806 to Stetson Jan. 2 1923 No. 1,440,505 and patent to Allen, Oct. 28, 1913, No.'1,076,935.

I find that on this type of shuttle where the guide part of the threading block eX-' tends down in the direction of the path of the unwinding yarn in many types of Work it is not necessary to have any overlap or scroll at the back but merely a guide hookor finger, the end of which comes fairly close to the bottom or side whereby the yarn as it spins around in unwinding is automatically guided and kept in the threading chamber.

To prevent a loop forming on this back guide it is desirable that itv should taper down so that if the yarn is thrown from the bobbin and does loop, it willslip oil at the next pick.

I find however that while on the first pick when the new bobbin is introduced in the shuttle the yarn is substantially straight and under tension and slips easily into place, at the beginnin of the second or return pick there is necessarily a slackness in the yarn amounting to from 6 to 12 inches and this is not instantly taken up. As a result if the yarn has a tendency to kink or if it happens to fall over, away from the eye and up under the front hook, the thread on this pick does not pass through the eye of the shuttle. The yarn has a tendency to kink upward and to utilize this tendency I form this particular type of front guide and also modify the front \edge of the threading block to cooperate with it.

This takes the place of any overlapping shield at the front which may be'ne cessary if the front guide finger-isof a diilerent form; I

In my construction, I find moreover it is not necessary to have a front hook raking backward as well as a back hook raking forward, and while prefer to have a. back hook or guide which rakes forward, I have the back edge of the guide and the front edge of the guide both raking forward so that the yarn cannot betrapped between them. I

My construction is much simplified and as it conforms to the natural. movement of the yarns and threads so easily it is very difficult for the yarn when it once has passedunder the frontguide, to escape therefrom. On the first pick there are several forces operating on the thread. There is the pull in the direction of the axis, the unwinding from the bobbin depending on the direction of the wind, and more or less tendency to balloon, depending somewhat on the distance between the friction intheshuttle eye and the position on the length ofth'e bobbin, where the thread is unwinding. IVhen unwinding from the tip the tendency to balloon is different from when it is" unwinding from thehead. There is another force which is the result of the blow ofthe picker. This gives more or less of a jerk or snap to the thread, sometimes throwing it to a considerable extent. i

I have/utilized all these forces and have eliminated various unnecessary parts thereby producing an exceedingly simple shuttle eye. It is possible to produce such a simple shuttle eye by die-casting, using a relative ly soft alloy-to make, in a few operations, a very smooth, satisfactory product.

However when using any metal and especially a soft metal it is necessary to prevent the thread from riding in any one position over the top, or in any one position over the front of the horn as it will eventually cut a groove and this groove will cut the thread.

- on the second pick, the thread should slip down over the horn into the side eye and should stay there, where the horn and the arrangement ,of parts should keep it' from unearthing.

In the drawings, Fig. 1 is aplan View of the eye end of a shuttle: with my preferred form of shuttle eye in. position,-and wi th a I bobbin and the thread running therefrom, shown in full lines asiit is positioned during the first pick, and in dotted linesduring part of the second pick.

Fig. 2 is an. elevation of the shuttle block. as from the left-of Fig. 1, looking. towards the point. or team; the,- bottom as shown on the drawing, removed from the shuttle, two common positions of the thread being shown, one in full lines and the other in dotted lines.

Fig. 3 is a view from the right of Fig. 2.

Fig. 4: is a view from the left of Fig. 2.

Fig. 5 is a view of the back of Fig. 2.

Fig. 6 is a view from the front as shown by the arrow on section line 66 of Fig 1.

Fig. 7 is a view similar to Fig. 3 showing my shuttle block as it comes out from the die-casting.

Fig. 8 is a front view similar to Fig. 3 of a modification.

Fig. 9 is a View similar to Fig. 5 of another modification.

Fig. lOis a plan view similar to Fig. 1 of still another modification.

S is a shut-tle of the self-threading type for automatic looms, having the usual bobbin chamber 10 for the bobbin B from which the thread is unwound in the direction of the arrow in Fig. 1. 12 is the thread chamber which extends forward in continuation of bobbin chamber 10, and 13 is the delivery passage which extends still further forward from the threading chamber.

H represents the shuttle eye in the wood, and this connects with the threading chamber 12 through the slot 15 cut away from the delivery passage 13. 8 represents the metal tip of the shuttle.

This eye His what is known as a left eye as it is at the left when looking towards the tip 8 of the shuttle.

F represents a metallic threading block which is set into a recess inthe wood of the shuttle and is shown as fixed therein by means of a screw 36 which passes through a hole in the wood of the shuttle and a hole in the block, in a well known manner. Preferably there is also at the bottom of block F, the projection 34 which fits into a recess in the wood of the shuttle.

32 is the horn and 33 the thread pin, both of well known'form. l

My improvement is more particularly useful in connection with a certain type of threading block such as shown in patents to Snow and Allen referred to herein and as shown at F in Figs. 1 to 7 in which there is a thread directing guide plate G which extends from the top thereof and from the top side of the shuttle, down and out at 22 into the threading chamber 12, or that part of the threading chamber which is enclosed in the threading block itself indicated at 9 in Fig. 1.

In Figs. 1 to 8 there is at or near the back athread retaining guide hook or member 24: which is in extension of the sloping part 22 of guide plate G. As this together with the part 22 of guide plate G extends in the same direction and proximate the normal unwinding path of the thread asit unwinds on the firstplck of the shuttle in a maga somewhere nearly coincides with the center or axis of the passage 9 as should be the case and as shuttles are ordinarily constructed.

It is clear that when once in the passage 9, the unwinding thread will travel around in the direction of the arrow as'it unwinds from the bobbin, and there will be very lit tle likelihood of its unthreading even if there is no overlap locking device such as shown in certain other patents.

The special feature of this device is the thread trapping front finger 19 which extends from and under the front partof guide plate G down and forward and narrows from its base 27 to its tip 28. i

As shown in Fig. 1 by the full lines, the thread A is in the position which is shown on the first pick, where the shuttle is movlng away from a point beyond 8 and the thread is under tension .at the same time that it is unwinding. It will naturally slip around the guide member 2 1 into the cham ber 9 and down between front finger 19 and the wood through passage 14, shown clearly in Fig. 6 although these two approach each other closely, because the unwinding of the thread throws it into the trough indicated at 5, and it slides down over G and the part 15 cut away from the wood.

lVhen once in at the left of finger 19 on the first pick, on the second pick as the thread A is caught between the warp threads which have shifted and the lay is moving back, before the shuttle is picked, it is moved away so that the thread extends diagonally, as shown by the dotted lines at 2 in Fig. 1,

.the tendency before the second pick being to prevent it from unthreading around or under finger 19. At the second pick however there is a certain amount of slack in the thread, anda certain amount of kinking illustrated at 3 and t in Fig. 2. This slackness continues from the position where the shuttle starts back until it is an equal distance in between the warp threads, and it is at this slack period when the thread, because of kinking, air currents and various other forces, occasionally unthreads and slips back so that it runs over the shuttle block instead of slipping into the eye as it should. In Figs. 2, 3 and 4 I illustrate this. v

Thee'xtending of finger 19 down and forward serves to prevent such unthreading and as it tapers from 27 to 28, if the thread should loop around it, the loop will slip off. To further prevent the thread from run ning over the top at the point 27 or the point which'substantially corresponds with it in Fig. 10, I prefer to change the shape of the front edge 16 from the customary curved shape shown at 90 in Fig. 10 to a straight edge 16 running directly from the base 27 of the front finger 19 to the side eye H. This front edge 16 together with the front finger l9 cooperating with the position of the shuttle on the second pick make it almost impossible either for the thread to unthread or to run at a particular point over block F.

In Fig. 2, I show an oven-head friction L extending through a hole and an underneath friction 85 extending through a hole 84 whereby the thread is held very closely in position.

As shown in Fig. 7 the fingers or guides 19 and 24 are first formed straightened out, and then they are easily bent around to the desired positions.

In Fig. 8, I show the top front finger as bent around into a hook while in. the Figs. 3, 4; and 6 it is bent down at 19 to a vertical position. Either form may be used.

In Fig. 9, I show a front trapping finger 82 which may be of either form but the bottom front edge 83 of the guide plate is not cut away as it is at 37 in Fig. 5 but extends in a very slight curve or straight back to the back guide 81.

In Fi 10, I show a block K with a front trapping finger 92 of substantially the same shape as 19 from which the front edge 9O curves forward from the base of finger 92 back to edge H, leaving a sort of hollow at 95 in which there is danger that a thread may catch and run.

I show a single friction 91 underneath and near the middle of threading block K, and the guide plate 93 extends from the top side of the shuttle only a very short distance into the threading chamber indicated at 9%. This serves to help keep the thread A in position,

eye, a bobbin chamber and a threading chamber in continuation thereof which connects with the eye, of a thread directing guide plate which extends from the top side of the shuttle in the same direction and proximate the normal unwinding path of the thread as it unwinds on the first pick of the shuttle in a magazine loom into the threading chamber; such guide plate having a thread trapping front finger which extends from and under its front part down and forward and which narrows to its tip, said guide plate also having its front edge extending from the base of said finger in a eye, a bobbin chamber and a threading chamber in continuation thereof which connects with the eye, of a thread directing guide plate which extends from the top side of the shuttle in the same direction and,

proximate the normal unwinding path of the thread as it unwinds on the first pick of the shuttle in a magazine loom into the threading chamber; such guide plate having a thread trapping front finger which extends from and under its front part down and forward and which narrows to its tip, said guide plate also having its front edge extending from the base of said finger in a substantially straight direct-ion back towards the shuttle eye and having a thread retaining guide book which extends from and under its back part.

3. The combination in a shuttle having an eye, a bobbin chamber and a threading chamber in continuation thereof which connects with. the eye, of a thread directing guide plate which extends from the top side of the shuttle in the same direction and eye, a bobbin chamber and a threading chamber in continuation thereof which connect with the eye, of a thread directing guide plate which extends from the top side of the shuttle into the threading chamber,

such guide plate having a thread trapping front finger which extends from and under its front part down and forward and which narrows to its tip, said guide plate also having a thread retaining guide hook which extends from and under its back part.

5. The combination in a shuttle having an eye, a bobbin chamber and a threading chamber in continuation thereof which connects wit-h the eye, of a thread directing guide plate which extends from the top side of the shuttle into the threading chamber; such guide plate having a thread trapping front finger which extends from and under its front part down and forward and which narrows to its tip.

ROBERT N. ALLEN.

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