US1613487A - Thread guide for shuttles - Google Patents

Description

Jan. 4,1927. w 3,487

I. SNOW THREAD GUIDE} FOR SIHUTTLESQ Filed May 14, 1925 r/as IN V EN TOR.

Patented Jan. 4%, 1927.

UNITED STATES ISAA Q SNOW, OF LAWRENCE, MASSACHUSETTS.

THREAD GUIDE FOR SHUTTLES! 'Application filed May 14, 1925 Serial No. 30,217.

In an automatic loom when the bobbin is I shifted, it is desirable that at the first pick the yarn should automatically slip under a front guide finger or hook and it is also desirable that it should slip under a back guide finger or hook. During the second pick, when the shuttle is thrown back, if every thing functions properly, the yarn should slip down into the .eye of the shuttle over the front of the horn, thence up behind the horn and in front of the pin. When once in this position it is highly desirable thatit should stay there.

Ordinarily the horn keeps it in place but at the beginning ofthe second pick and of every-pick thereafter, there is a period during which the eye of the shuttle is traveling to the selvage edge of the cloth, whenthe yarn has several inches ofslack. During this slack period, there is a tendency for the yarn to kink, and also some tendency for it to drop and slip out from under the horn and also from under the front guide finger or hook. WVhen the yarn begins to kink, almost anything may happen to it, and occasionally it happens that it slips up and runs over the top of the shuttle block or guide plate.

When this happens, it is advantageous to have a back guide finger, guard or hook, to keep the yarn from slipping entirely back to the bobbin. If the yarn does slip entirely over the-shuttle eye block and runs over the side of the shuttle, it must break.

My present invention refers particularly to this back guide finger or hook which is so shaped that it allows the yarn to slip down over its outside and thence to its inner side, but is so shaped at the front as to accomplish my purpose.

This purpose is to keep the yarn down as near as possible to the axis of the bobbin so that it will pull off or run 011' evenly without jerking, and will rethread by passing under the front hook and horn, more easily than if it was held up high.

In the drawings, Fig. 1 is a plan View of a shuttle with my improvement.

Fig. 2 is an elevation of the shuttle block removed, as viewed from the top of Fig. 1. V

Fig. 3 is a front elevation of the shuttle block removed from the shuttle. V

Fig. it is a back view of the shuttle block,

Fig. 5 is a diagrammatic view. similar to Fig. 2, showing also the relative position of the bobbin.

, Fig. .6 is a rear view of a modified form.

Fig. 7 is a sideelevation of Fig. 6.

Fig. 8 is a detail of a modification.

.Fig. 9 is a detail of another modification.

Fig. 10 is a detail of another modification.

Fig. 11 is a side elevation similar to Fig. 2 of another modification.

Fig. 12 is a plan view of the nose of Fig. 11.

S is a shuttle of the self-threading type for automatic looms, having the usual bobbin chamber 10 for the bobbin B from which the thread A 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 H is what is known as a left eye, as it is at the left when looking towards the tip 8 of the shuttle. I

F represents. a metallic threading block which is set into a recess 4 in the 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 3t 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.

My improvement is more particularly useful in connection with a certain type of threading block 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 thread ing bloek'its-elf indicated at 9 in Fig. 1.

In Figs. lYto 5, there is at or near the back a thread retaining guide hook or finger 2,8 which is in extension of the sloping part 22 of guide plateGQ 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 as it unwinds on the first pick of the shuttle in a magazine loom, that is in the direction ofthe arrow in Fig. 1, it is clear that it will slip into the part 9 of the threading chamber 12.

This isprovided the axis U.V. of the bobbin B somewhere nearly coincides with the bottom 10 or axis of the passage 9 as should be the case and as shuttles are ordinarily constructed. 7

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

The guide plate or guide wall G which is shown as beingpart' of or starting at the top of shuttle block F, extends down in passage 9 as part of the outside wall of back finger 28 and of front finger 16. These fingers are in extension thereof. 7

I prefer to form on the other side of passage 9, that is the side opposite eye H, a thread rest 40, which preferably slopes down from the front end 41 to the back end 42.

It also preferably slopes from the side next to the wood or opposite the eye, down towards the eye.

The front finger 16 may be slightly hooked as shown in Figs. 3 and 4, or it may be formed as at 17 in Figs. 6 and 7 that is, extending down straight. As shown at 17 it may extend forward to a point or may be blunt as at 16. The back edge, of back finger 28 slopes forward, and its front edge slopes in a substantially straight line from a point at 23 down and back to a point 24 near its tip, and thence forward to the tip 25 forming an angular notch.

As shown by the dotted line XY, in Fig. 5, the bottom edge of the front finger and of the back finger should be on or slightly above any projection of the top edge of thread rest 40 so that the threadwill have a straight passage. As shown in Figs. 2 and 5, there may be a jog or cut at 4A, leaving a slight recess 42. This helps to prevent the thread from ballooning and slipping by the tip 25 of the back finger.

The purpose of the sloopc from 28 to 2st is as shown in F lVhenever the yarn slips out from under the front finger it is desirable that it should slip down low as shown at Ain Fig. 5, rather than in the dotted line position T for the reason that on the next pick, if it is held down, it is more likely to slip under front finger 16, and ret-hread. 7

As shown in Figs. 6 and 7, a guide plate may be extended into a front finger 17 of tapering form and which extends down straight and into a back finger '51, similar to 28 while a thread rest 54 may extend from the front 52 to the back 53 in a straight fiat plane sloping down and in.

On the other hand as shown in Fig. 8 the thread rest (30 may have a recess 61 into which the tip end 62 of the back finger 65 may extend.

As shown in Fig. 9, the thread rest 71 may extend up at 72, a little behind the point of back finger 70.

As shown in Fig. 10 the thread rest 81 may project slightly above the tip 83 of back finger 80, such tip 83 extending down into a recess 82 which is open at the back.

As shown in Figs. 11 and 12, the front guide finger may be replaced by a nose 90 of well known form and the back edge 91 of back guide finger 92 may slope down and back instead of down and front.

It is highly desirable that in every type.

the back guide finger should taper from its top such as 23, 55 and 93, to its tip as 25, 56 and 95, so that if a loop forms as at R in Fig. 7, it will slip off the tip and not cause the thread to break.

I claim:

1. The combination in an'automatically threading shuttle having in one side an eye in the wood, a shuttle block recess, and a passage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide plate which extends down into the recess away from the I eye, and is formed at the front with a guide finger which extends downward, and at the back with a back guide finger which extends down and has a back edge which slopes forward and a front edge which slopes in a substantially straight line down and back to a point near its tip and thence forward forming an angular notch, both guide fingers be ing in extension of the guide plate.

2. The combination in an automatically threading shuttle having in one side an eye in the wood, a shuttle block recess, and a pas-- sage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide plate which extends down into the recess away from the eye, and is formed at the front with a guide finger which extends downward, and at the back with a back guide finger which extends down and has a back edge which slopes forward and a front edge which slopes in a substantially straight line down and back to a point near its tip and thence forward forming an angular notch, both guide fingers be ing in extension of the guide plate; and a thread rest which extends up in the recess opposite the eye and which slopes down therefrom towards the eye, and from the front to the back from below the front finger to a point just below the lower end of the back finger.

3. The combination in an automatically threading shuttle having in one side an eye in the wood, a shuttle block recess, and a passage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide plate which extends down into the recess away from the eye, and is forn'ied at the back with a back guide finger which extends down and has a back edge which slopes forward and a front edge which slopes in a substantially straight line down and back to a point near its tip and thence forward and down in a taper to its tip forming an angular notch, the outer side of said guide finger being in extension of the guide plate. r

4. The combination in an automatically threading shuttle having in one side an eye in the wood, a shuttle blockrecess, and a passage connecting the eye with the recess; of a shuttle block fastened in said recess having at the top a guide plate which extends down into the recess away from the eye, and is formed at the back with a back guide finger which extends down and has a front edge which slopes in a substantially straight line down and back to a point near its tip and thence forward and down in a taper to its tip forming an angular notch,

ISAAC SNOW.

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