US1728160A

US1728160A - Self-threadihg loom shuttle

Info

Publication number: US1728160A
Authority: US
Publication date: 1929-09-10
Anticipated expiration: 1946-09-10

Description

SePt- 10, 1929. G. A. LITCHFIELD 1,728,150

SELF THREADING LOOM SHUTTLE Filed OCC. 12, 1927 lIr\\ www@ I v "'fjs 4 v 7 d' fwn/WMM.

Patented Sept. 10, 1929.

UNITE@ Pialhltil" OFFICE.

GEORGE A. LITCHFIELD, OF SOUTHBRIDGE, MASSACHUSETTS. ASSIGNOR TO LITCH- FIELD SHUTTLE COMPATY, OF SOU'IHBRDGE, MASSACHUSETTS, A CORPORATION OF INIASSACHUSETTS.

SELF-THBEADING LOOIJI SHUTTLE.

Application filed October 12, 1227.

This invention relates to loom shuttles, and particularly to those of the self-threading type in which the thread or `yarn is required to automatically 'thread itself after a fresh bobbin has been inserted in the bobbin chamber of the shuttle.

The present improvements are intended to provide a construction that will7 to the greatest possible degree, facilitate the easy and 10 certain threading` of the shuttle, while` reliably preventing the accidental escape of the yarn therefrom after it has been threaded.

In the efforts to produce a threading construction that will be proof against untlireading, the practical tendencyhas been toward providing means for over-hanging the thread passage, such means being usually so arranged as to obstruct or impede the usual threading of the shuttle. My present improvement is designed to provide threading means which will, to the greatest possible degree, facilitate passage of the thread into the yarn-admitting passage without obstruction, while providing an adjacent thread passage so arranged that the yarn must pass from the admission slot into the thread passage, while making it virtually impossible for the yarn to escape from the thread passage into the admission iLiiassage or slot. Furthermore, means are provided-` intermediate of the forward and rear ends of the passage, to choke or restrict the ballooning of the yarn both for the purpose of providing any desired tensioning' of the yarn and also to prevent the ballooning' from carrying it out of the thread passage and thus lead to possible cle-threading of the yarn. One advantage of the present improvement is that it is exceedingly simple and inexpensive to construct in exactly the form and proportions desired, and avoids the troublesome practice in vogue heretofore of attempting to cast the thread-block in an open or distorted shape and thereafter bend the parts of the thread-block into their desired final position or relationship after it has been machined.

In the accompanying drawings I have illustrated a form of construction and arrange ment embodying' the principles of this invention, in which Serial No. 225,770.

Figure l is a plan View of the forepart of a shuttle containing my improved threading block properly secured therein.

Figure 2 is a cross sectional View on the plane 2 2 of Figure l.

Figure 3 is a detail plan View of the threaded block detached from the shuttle.

Figure 4 is a rear end elevation of the same.

Figure 5 is a side elevation of the threader block as viewed from the outlet side of the shuttle.

Figure (i is a bottom plan View of the threader block.

Figure 7 is a front elevation of the threader block.

Figure 8 is a detail View in rear elevation of the threader block-casting before it is machined in the manner hereinafter described.

ln practice, the shuttle body a has the usual forepart provided with the threader block containing recess c in which the threading block is firmly secured by the usual locking bolt lO passing transversely through its rear- Yard bottom portion. As usual also7 the block-receiving recess is provided with a lateral outlet passage (l for permitting the delivery ofthe yarn in the weaving operation.

The threader block l comprises a rear portion occupying about one-half the length of the block that is wide enough to extend substantially beyond the medial axis of the shuttle. on both sides, and is partly subdivided by a longitudinal vertical slot located to form the main deflecting member 3 and the supplemental deflecting member 4. the former having a forwardly projecting continuation of conoidal form forming a detlecting beak 2, terminating in a downwardly extending tapered tip 2n. lying adjacent to the opposite vertical wall of the forward portion c of the recess c, the beak overhanging the outlet passage rl into which the inthreading yarn is deflected by the downwardly and rearwardly inclined surface of a deflectinghorn 5, arranged at the forward end of the threader block.

As clearly shown in Figures 2, 4 and 7, the top surface of the rear half of the threaderblock casting is formed with oppositely inclined or curved, downwardly extending surfaces forming a sort oit elongated convei throat tlnough the rear half ot the threauinLV block. This converging throat or trough can be readily slotted longitudinally toany desired width, according to the sine oit the yarn that the shuttle is intended to use, this forming a vertical admission or inlet passage without the slightest obstruction to the admission of the yarn to the bottom thereof.

The main rear portion 3 is longitudinally bored or drilled to any desired diameter` according to the range ot yarn to be used, as shown at 3a, this bore extending in substantial parallelism with the admission slot l` through the rear h alf of the thread block, and being divided or separated from the admis'- sion passage by the depending lip portion 3" of the main rear member By means ot a breach the lower portion of this vertical. separating wall 3l can be cut awayv to form a narrow longitudinal. communicating slit for the passage of the yarn Jfrom the bottom portion of the admission slot into the yarncon- .tining passage 3a. These operations are readily7 performed so as to give each or passage the desired width or diameter to suit the particular requirements oi' the various sizes of yarn, whether cotton, silh or wool, for which the shuttle is intended.

It will be noticed that the forwardly eirtending inner edge of the conoidal bealr` 2 is lfterally offset with relation to the admission slot l, and its inwardly sloped surface at this point forms a continuation of the similarly sloped surface of the rear member 8 to insure the deflection of the yarn into the bottom of the slot la. It will also be noticed that the longitudinal slot l, and the inner edge 2b ot the beak, while arranged in laterally offset planes, are disposed in planes slightly oblique to the longitudinal medial axis of the shuttle so that it these two planes be continued they will intersect different portions o'l' the side vall c2 of the forepart recess through which the yarn passes in the inthreading operation. rEhe downwardlf,1 entending tapered tip 2 is located in closel proxin'iity to the opposing portion of the wall c2, the intervening space here being preterably very slightly narrower than the diameter of the yarn to be used but not sufficiently narrow to prevent easy passage of the yarn under and around this tip as it is deflected downwardly by the :forward edge of the defleeting horn 5.

In line with the undercut portion 5L ot the forward horn 5 is mounted the usual wear pin 6, which may be of hardened steel or porcelain, around which the yarn maires a quarter turn as it passes through the lateral outlet passage CZ.

A telt plug 7 is inserted in the threadblock so as to pass through the varn passage 32, intermediate oit the ends thereof, and to avoid obstruct-ing the communicating slit forming the entrance to the thread passage 8, this intermediate plug is set obliquely in the threader block, thus confining the ballooning to the upper portion oit the yarn pas This arrangement of the yarn-retardw infr and clicking member i' permits the suiticient freedom oitl the yarn uncoiling over the end ot the bobbin, while it makes it virtually impossible for the yarn to accidentally escape from the yarn passage since its revolution, while unwinoing, is in a direction that guides itaway from any tendency to pass out through the communicating slit and, furthermore, owing to the considerable length or elongation ot the pa rtitiou wall 3l, there is not the opportunity for a loop of the yarn to pass out of this elongatee slot, such as is aliorded when only a narrow or short obstruction is provided against the escape ot' the yarn.

rlhe main deiiecting` surface for inverting the yarn into the shuttle, of course, is formed by the inwardly sloped surface extending trom the rear of the member 3 to the vt'orward point end of the beak, while the opposing` rear member il does provide an inward and downward detlecting surface when the ballooning yarn impinges upon that side of the admission slot. The member a also iforms a bra-'3e :tort receiving and supporting the inward thrust of the pressure exerted by the spring-pressed shuttle bei; arm against the cut away and weakened orepart wall on the inlet side of the shuttle, and this prevents the splitting of this wall which often result-s from such pressure. The member il is provided with a lateral boss la seated in a suitably formed socket or vertical recess to aid in holding the shuttle threader in precisely the correct position, and this anchoring is 'turther supplemented by a depending lug 8 seated in a corresponding recess in the bottom l ,U or the portion of @ne torepart. The forward end or apex of the conoidal beak 2, instead ot being depressed or bent downwardly, in an elevated plane a substantial. oistanee above the bottom of the detlecting horn so that there is no tendency to prevent the yarn from readily slipping around the dspendingtip oli the beak into delec'ting en. Ugement with the forward inclined edge ot e horn 5. Indeed the yarn has the utmost freedom or' ingress for the inthreading movement, while, owing to the construction and relation of the parts described, accidental escape from its proper threaded position is practicallimpossible under actual conditions oi" service.

That I claim is:

l. A self-threading shuttle embracing in its construction a shuttle tore-part termed with a block-receiving recess, Aa threading block secured therein, the rear haliz ot said block being provided with a threadedmit ting slot between vertical parallelI walls whose upper surfaces are oppositely inclined liti ETSO

throughout their length to lead the thread into the bottom of said slot, the portion on the inlet side of said slot being longitudinally bored to form a longitudinal thread passage substantially parallel with said slot.` the intervening depending wall being cut away slightlyY above the level of the bottom of said slot 'to form an elongated slit for the admission of the thread from said slot into said thread passage, the upper portion of the block, forwardly of said slot, forming :1 deflecting conoidal beak terminating in a downward projecting tip in proximity to the opposite side wall of the thread block recess.

2. A threading' block for insert-ion in the block-receiving recess of a shuttle foreparl', embracing in its construction a longitudinal block whose rear portion is substantially oil'- set beyond the inner edge of its forward portion and is provided Vith an elongated vcrtical longitudinal admission slot forming a downward continuation of convergent top surfaces on opposite sides of the slot beyond the medial axis of the shuttle from let side. the block being also pr longitudinally bored thread aga rrr-fending alongside the vertical slot on the outlet side thereof and having eomniunicalion wir said slot through an elongated narrow slit located at the bottom of t-he slot. the foi-wa rd portion of the block forming a conoinal beak, and having an underneath horn whose ferward edge is inclined rearwardly and doi-rnwardly to guide the yarn downwardly and rearwardly into the thread-eye of the shuttle.

3. A thread block for insertion into a receiving' recess in the forepart of a shuttle` embracing a conoidal surfaced forwardly extending beak whose ai iproxiniatel v strai inner edge extends slightly beyond the uiedial axis of the shuttle and a rearward portion laterally offset beyond the inner edge of the beak, said offset portion extending' approximately half the length of the bloei; and being vertically slotted throughout il" length and having downwardly sloped convergent top surfaces leading into said slot. a longitudinally disposed yarn passage extending alongside said slot and separated therefrom except at the bottom by a vertically depending elongated partition wall arranged to prevent the lateral escape of yarn from said passage.

fl. A thread block for insertion into a receiving recess in the forepart of a shuttle, embracing a conoidal surfaced forwardly extending' beak whose approximately straight inner edge extends slightly beyond the mcdial axis of the shuttle and a rearward portion laterally offset beyond the inner edge of the beak, said offset portion extending approximately half the length of the block and being vertically slotted throughout its length and having downwardly sloped couvergent top surfaces leading into said slot,

a. longitudinally disposed yarn passage extending alongside said slot and separated therefrom except at the bottom by a vertically depending elongated partition wall arranged to prevent the lateral escape of yarn from said passage, a yarn-retarding member inserted obliquely through said passage intermediate of its ends.

5. A thread block for insertion into a receiving recess in the forepart of a shuttle, embracing a conoidal surfaced forwardly extending beak whose approximately straight inner edge extends slightly beyond the medial axis of the shuttle and a rearward portion laterally offset beyond the inner edge of the beak, said offset portion extending approximately half the length of the block and being vertically slotted throughout its length and having downwardly sloped convergent top surfaces leading into said slot, a longitudinally disposed yarn passage extending alongside said slot and separated therefrom except at the bottom by a vertically depending elongated partition wall arranged to prevent the lateral escape of yarn from said pas-. sage, means inserted in said passage intermediate of its ends to restrict the ballooning and frictionally retard the yarn traveling to ard the shuttle outlet, while leaving the space below said partition clear for the ingress of the yarn.

G. A threading block for insertion in the forepart of a loom shuttle, embracing in its construction a tapered forward portion terminating at its apex in a downwardly extending tip in close proximity to the opposing interior wall ofthe shuttle forepart, and a rear portion formed with downwardly sloped convergentfaces forming an elongated deflecting trough beyond the medial axis of the shuttlesaid trough being continued downwardly by an elongated vertical slot, the rear part being also provided with a circularly bored longitudinal passage extending parallel to said slot and having lateral communication therewith at its bottom only by means of an elongated slit, thereby presenting no obstacle to the ingress of yarn into said passage while preventing its lateral escape therefrom.

T. A threading block for insertion into the forepart of a loom shuttle having extending longitudinally through its rear portion side by side a cylindrical thread passage, and a narrow vertical inlet slot separated therefrom by an elongated partition wall extending nearly to the common level of the bottoms thereof, and having a forwardly extending' tapercd beak provided with a depending rearwardly inclined underneath dellecting horn for guiding the inthreaded yarn to the thread-eye of the shuttle.

ln witness whereof, I have subscribed the above specification.

GEORGE A. LITCI-IFIELD.