US2177134A - Shuttle tension - Google Patents

Description

P. DOERSELN SHUTTLE TENSION Filed March 1. 1939 r Jil 0 i ii INVENTOR,

ATTORNEY.

Patented Oct. 24, 1939 UNITED STATES ATENT OFFICE 5 Claims.

This invention relates to shuttles for broad looms and its object is to provide such a shuttle with a tension means which shall be both efficient to control the tension and capable of being threaded without recourse to the usual hook or equivalent expedient for effecting threading. It is intended that, the quill or other thread-supply being usually already in the shuttle, the threading may be effected by a strain on the thread while maintaining it between the point of the pull and the quill in contact with a part of the tension means. This operation may be performed by hand or it may occur entirely automatically on the stroke of the shuttle in the appropriate direction, as in looms which either renew the thread-supply of the shuttle or replace the entire shuttle on exhaustion of weft or filling.

According to the invention, given the fixed structure of a shuttle having a top cavity, and in the cavity a quill or equivalent thread-supply arranged to deliver toward one end of said structure, there is a delivery-control device, as a lever, for the thread which is movable in the cavity and yieldingly urged to a given limit, and said device and structure have portions which, when said device is at said limit, intermesh with each other and together provide surfaces converging downwardly and forming between them an open intake-crotch for the thread, one of the parts formed by said structure and device having means to catch and obstruct upward displacement of the thread when it has been passed below the point of convergence of said surfaces. In practice, said surfaces converge toward a vertical longitudinal plane of the shuttle and said means is above a straight line between the quill and a surface of the shuttle structure, forward of its cavity, on which the thread may rest in the threading operation, whereby the ultimate tautening of the thread to straight state will cause it to underlie said means, which of course maintains it in controlled state.

In the drawing:

Fig. 1 is a. plan view of a shuttle embodying the invention and Fig. 2 is a right side elevation thereof;

Fig. 3 shows the shuttle body in plan, with the tension unit removed;

Fig. 4 is a section on line l4, Fig. 1;

Fig. 5 shows said unit in plan with the thread shown dotted as about to enter, and'shown in full as having entered, into control of said unit;

Figs. 6, 7, and 8 are respectively a right side, left side and rear elevation of said unit; and

Fig. 9 is a profile view of the parts of the sup port and lever of the tension unit directly active to control and tension the thread and showing the thread about to enter between them.

The shuttle body I has the usual cavity 2 to receive the quill or weft-thread-supply core 3 and in the cavity there may be the crossing groups of bristles 4 past some of which when the shuttle is initially threaded the thread springs to be thereupon held by the bristles against undue up or down displacement between the quill and the tension unit. The forward part of the cavity has its bottom elevated and forms a recess 5 shaped to receive and fit the tension unit, and communicating with this is a generally V-shaped opening 6 extending to the outer side of the shuttle body; extending forwardly from the recess is a top groove 7 in which the thread is to lie on the initial stroke of the shuttle to the left.

The tension unit includes a support which may be generally described as including a base 8, a longitudinally extending upright wall 9 and an upright ll opposed to and spaced from the rear end of the wall 9, both of these rising from the base.

The base 8 has a pair of depending lugs to to enter and fit sockets la in the bottom of the cavity; the support is held in the shuttle by a screw H extending through the near side of such body and tapped into the wall 9. Thus the support forms a part of the fixed structure of the shuttle.

The wall 9 is formed as follows: At its forward end and projecting therefrom forwardly and also laterally outwardly is a projection l2 formed to abut the rear side of opening 6 but to exist short of the forward side thereof, thus to leave a slot l3 which leads to an outlet M in the near side of the shuttle body, the ends of such outlet being afforded by thread-guide pins 55, one of which may be mounted in the body and the others in said projection. The shuttle body forward of the slot and said projection rearwardly of the slot are rounded off, as at it; so also is the top outer surface of the projection, as at i'i. The projection forms a horn or beak projecting forwardly-the slot being inclined, as shown-and also projecting inwardly, its terminus l8 extending more or less past a vertical longitudinal plane coincident with the gripping device 24. From the inner side of the wall 9 reach upper and lower series of three projections l9, those of one series being directly above those of the other, and each two projections, upper and lower, joined by a pin 28 which is set back from the ends of the two projections. The top projections are beveled, as shown, in the direction relatively away from the near side of recess 5. Each two projections and corresponding pin form what I term a thread rest of which the thread rest proper is the pin. The top surface of wall 9, where it includes the tops of the upper projections, is rounded off as indicated at 22.

The upright no is bifurcated as seen in end elevation, its crotch opening toward the far side of the shuttle. A vertical pivot pin 23 penetrates the two arms of the upright and on this: is fulcrumed a tension-lever serving as the deliverycontrol device and formed as will appear.

The wall 9 and upright ii) support the members of a well-known thread gripping means constructed as follows Two opposed upright blades 26, having their upper ends diverging, are confined in the space between wall 9 and upright It! by a pin 25 in wall 9 and penetrating the blades. A light spring 26 presses the blades against the upright, being arranged in a suitable bore in wall 9 and backed by an adjusting screw 21.

In this example the mentioned lever is formed of a suitable length of wire having one end developed as a coil 23. At equal intervals of its length it is formed with a series of rebends 29, all in the same plane substantially perpendicular to the axis of the coil and all projecting substantially perpendicularly to the alined intervening portions 3!} of the wire. All these rebends are bent upwardly, as at St, substantially rightangularly and all in the same plane, and their terminals are bent off at an upward incline toward the vertical plane of the portions til; in plan, these terminal portions, though parallel, may be diverted toward the front end of the shuttle. A light spring 32, coiled around pin 23 and having its ends engaged with coil 28 and the support, tends to hold the lever in the position shown, being adapted to yield to the lever when the latter is subjected to force tending to turn it anticlockwise, as that of the thread in threading the shuttle.

To prevent the thread finding an inoperative position under the lever, a pin 33 projects from the support well beyond the alined portions 39 of the lever.

Viewing those parts which are shown in Fig. 9 as they there appear, the lever being in its normal position, a crotch exists arranged to receive the thread a and which is formed by the downwardly converging surfaces of the lever terminals 31a and of those parts of the support which produce the upper projections I9. In a plane below this crotch are shoulders, being the under sides of said projections, and these form means to catch and obstruct upward displacement of the thread when it has been passed below the point of convergence of said surfaced Essentially, whether the operation of threading is done by hand or in the loom, the thread in the latter case being in some known way held while the shuttle moves to the left, such operation is as follows: The thread is subjected to a pull while resting the mentioned crotch and (it being understood that the point of convergence of the crotch above the level of the quill) with the thread initially held arched by the tension means. Under the pull and in the eifort to straighten, the thread crowds the lever away from the support, the lever shifting anti-clockwise, and in its ultimately straightened state assumes a position between the portions 3i of the lever and said support. Actually, in its straightened state it underlies the upper projections H), which thereafter prevent its upward displacement from b tween the lever and support. This will be so if the thread is supported forward of.the tension unit as well as by the quill back of it below the level of the means, as the upper projections it, which are to retain it against upward displacement.

While the horn i 2 is not indispensable it is present to insure inevitably the complete threading. That is to say, if for any reason the lever should be disposed temporarily not to respond to the pressure of the thread as the latter seeks to straighten when the shuttle moves to the left, then on the next pick to the right the thread would be cammed by the under side of the horn toward outlet I4, developing in a bight which would insure retraction of the lever and hence the complete threading.

Having thus fully described my invention, what I claim is:

1. In combination, with the fixed structure of a shuttle, the same having a top cavity and between said cavity and one end of the structure a top thread-supporting surface, and a thread-' supply in the cavity arranged to deliver toward one end of said structure, of a delivery-control device for the thread movable in the cavity between said supply and end and yieldingly urged to a given limit, said device and structure having portions which, when said device is at said limit, intermesh with each other and which together provide surfaces converging downwardly and form between them an open intake-crotch for the thread, one of the parts formed by said structure and device having means to catch and obstruct upward displacement of the thread when it has been passed below the point of convergence of said surfaces and said means being at a level above the thread when it extends straight from said thread-supporting surface to the threadsupply.

2. The combination set forth in claim 1 characterized by said device being a lever fulcrumed in said structure.

3. The combination set forth in claim 1 characterized by said device being a lever fulcrumed in said structure and having its fulcrum upright and between said coactive portions and the threadsupply.

' 4. The combination set forth in claim 1 characterized by said surfaces converging toward a vertical longitudinal plane of said structure.

5. In combination, with a shuttle body having a quill-receiving cavity, a recess relatively forward of and forming an extension of the cavity and a notch leading from the recess through one side and to the exterior of the body, of an elongated support arranged in and at the side of the recess adjoining said side of the body and spaced from the opposite side of the recess and having a forward horn-forming projection extending laterally into the notch and forming with the part of the body forward of said notch an upwardly open slot and a thread outlet with which the slot at its lower end communicates, said support having relatively rearward of the notch and arranged lengthwise of the shuttle a series of spaced thread rests each reaching from but short of said opposite side of the recess and beveled at its top in the direction away from the first-named side of the recess and providing below its bevel an overhanging thread-retaining shoulder, and

said support providing rearwardly of the series of rests a projection reaching toward said opposite side of the recess, a delivery-control lever fulcrumed on said projection on a vertical axis spaced from the first-named side of the recess and having a plurality of upstanding thread rest portions registering respectively with the spaces

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