US2420216A - Shuttle and bobbin for looms - Google Patents

Description

L May 6, 1947.

wf L. WILLIAMSON SHUTTLE AND BOBBIN FOR LOOMS Filed March 20, 1945 Patented May 6, 1947 OFFICE SHUTTLE AND BOBBIN FOR LOOMS Walter Leo Williamson, Glen Iris, Melbourne, Victoria, Australia Application March 20, 1945, Serial No. 583,720 In Australia April 27, 1944 3 Claims.

This invention relates to shuttles and bobbins or pirns as utilized in looms for weaving various kinds of textile fabrics and is more particularly concerned with arrangements for detachably retaining the bobbins within the shuttles for carrying out weaving operations.

Various arrangements are in existence for this purpose. According to one arrangement a loose or detachable spindle upon which the bobbin is mounted is provided at one end with an enlarged head to limit movement of the bcbbin thereof. The other end of the spindle protrudes for a substantial distance beyond the adjacent end of the bobbin and has a recess to fit around a cross pin at one end of the shuttle so that after the recessed end of the spindle, with the bobbin thereon has been positioned beneath the cross pin, the assembly may be pressed downwardly with a swinging movement about the cross pin so that the protruding portion of the spindle forces a pair of springs jaws open and then allows them to move inwardly Iwhereby the spindle is detachably held in an operative position within the shuttle.

According to another known arrangement the spindle is pivotally anchored near one end of the shuttle and has a longitudinally extending portion in the form of a leaf spring which provides a frictional grip within the bore of the bobbin, a spring device being provided to co-operate with the inner end of the spindle in order to releasaby lock the assembly in position.

With the foregoing and other arrangements it is found that a very considerable proportion of the length of the shuttle is occupied by the mounting or retaining' means for the spindle and that the bobbin has necessarily to be much shorter than the shuttle.

Bearing in mind that in weaving operations it is necessary at comparatively frequent intervals to replace the spent bobbins by fresh bobbins, it is a matter f the utmost importance from the economic point of View that the maximum amount of yarn should be carried by the bobbin and that the changing of bobbins may be accomplished in a speedy and simple manner.

The invention aims to achieve this object and, by way of comparison, it may be mentioned that for a given sized shuttle it becomes possible to utilize bobbins having suicient yarn to operate for say 5 minutes as compared with 3 minutes where a conventional shuttle and bobbin arrangement is employed.

A description, aided by reference to the accompanying drawings, will now be given of one practical way in which the invention may be carried into eiiect but it is to be understood that various modifications, renements and/or additions may be included without departing from the spirit and scope of the invention as defined by the appended claims.

In the drawings,

Figure l is a sectional elevation of a shuttle and bobbin, according to one embodiment of the invention, showing the parts in operative position.

Figure 2 is a sectional elevation of the left hand end, showing the bobbin spindle swung upwardly for interchanging of the bobbins.

Figure 3 is a cross-section on line of Figure 2.

Figure 4 is a persepective view of a detail.

Figure 5 is a plan view of Figure 1, omitting the bobbin.

In accordance with the illustrated embodiment the bobbin spindle S is adapted to be pivoted about a cross pin l which is located relatively close to one of the usual conical ends 8 0f the shuttle 9. For this purpose the respective end Ea of the spindle, which is of enlarged cylindrical or hollow form, has opposed jaws Il projecting lengthwise therefrom provided with apertures to receive the cross pin l. The axis of pin l bisects the longitudinal center line of the spindle and so provides for maximum leverage of the spindle and avoids downward swinging of any part when the spindle is being swung outwardly from its normal position. The cylindrical or hollow end portion of the spindle, slidably accommodates a plunger l2 which is urged outwardly by spring I3 and co-operates with guide or cam plates it located near the cross pin, such plates having recesses i6 (Figure 2 and 3) so that when the spindle 6 is swung downwardly into the shuttle, as in Figure 1, the plunger l2 is forced Aby spring I3 into the recesses of the cam plates,

so that the spindle is firmly but releasably held in operative position.

vThe recesses it in the plates It are advantageously of V-shape and the plunger has a V- shape nose l2a for co-operation therewith. While the main body oi the plunger is preferably cylindrical, the nose l2c may have flat sides which bear against the inner faces of the spindle jaws H whereby rotation of the plunger is prevented.

The enlarged hollow end 6a of the spindle may merge by way of a tapered portion 6b into the main part of the spindle to which it is secured in any suitable manner and which will be of the usual diameter.

The bobbins as indicated at l1 in Figure 1, are considerably longer, say about 20% longer, than the usual bobbins.

One end portion Vla of the improved bobbin is of hollow partially frusto-conical formation so that it gradually increases in diameter complementarily to the frusto-conical or tapered portion 6b of the spindle 6 and is provided near its outer extremity with an external circumferential groove I8, forming a beaded flange I9 at its adjacent extremity.

The yarn is wound upon the bobbin in the usual or any suitable manner and in view of the abnormal length thereof it will be apparent that a much greater length of yarn may be carried by the bobbin than by a conventional bob-bin.

To place a bobbin into operative position, the spindle S is swung upwardly about the cross pin 'I into a suitable angular position as indicated in Figure 2. To do this, it is merely necessary to apply upward pressure to the rear part of the spindle, so that the plunger nose l2 a is withdrawn from its locking recesses l5 and rides along the edges of the plates I,

The bobbin is then placed lengthwise upon the upstanding spindle with the hollow tapered end ll'a lowermost and litting fairly closely around the corresponding end of the spindle. The spin* dle and bobbin are then forced downwardly by a swinging movement about the cross pin l and as they arrive in a horizontal position (Figure l) they are automatically locked by the spring pressed plunger i2 and the guide plates ll.

In order to prevent undesired lengthwise movement of the bobbin along its spindle, a tongue 2l stationarily mounted in the shuttle il may project into groove I8 in the enlarged end of the bobbin as seen in Figure 1.

It will be appreciated from the foregoing that the adoption of a hollow construction for the inner end of the bobbin spindle and the utilization of the resulting cavity for the spring pressed plunger represents an important feature in savingspace within the interior of the shuttle and thus enables bobbins of considerably greater length than hitherto to be employed. It follows therefrom that each bobbin will carry a substantially increased amount of yarn so that the period between changing of the bobbins is equally increased whereby weaving operations may proceed with considerably less interruptions and time and labour for changing of bobbins will be reduced.

As bestJ seen in Figurei, the guide or cam plates l and the tongue 2l are advantageously in the form of a unit adapted to be secured by pins 22 extending across a cavity 23 formed in the shuttle near one end.

It is to be understood that although the construction and arrangement hereinbefore described is considered at present to be preferred, the essential features of the invention as defined in the appended claims, may be embodied in other constructions and arrangements that would be apparent to persons versed in the art.

Having now described my invention what I 4 claim as new and desire to secure by Letters Patent is:

1. In a shuttle and bobbin assembly for looms, the combination of a shuttle, a bobbin-carrying spindle, means pivotally connecting one extremity of said spindle to the shuttle near one ex. tremity of the latter so that the spindle may be swung outwardly about a transverse axis from an operative position within the shuttle, said axis bisecting the longitudinal center line of the said spindle, and a locking device, including a stationary part and a part which is movable axially of said spindle, which prevents inadvertent swinging movement of said spindle rom said operative position while permitting deliberate swinging movement of the spindle out of the shuttle to render the spindle accessible ior bobbin changing, and which is automatically reset into locking condition by return swinging movement of said spindle.

2. A shuttle and bobbin assembly for looms, comprising a shuttle having a cavity near one extremity, a pin extending transversely across said cavity, a bobbin-carrying spindle having a jawed formation projecting lengthwise from one end for pivotally connecting the spindle to said pin, the axis of the pin bisecting the longitudinal center line of said spindle and a resilient locking device extending axially in relation to said spindle between said pivot pin and said end of the spindle and comprising a, stationary indent member and a detent member slidable lengthwise beyond said end of the spindle, the mutually engaging surfaces of said members of the locking device being symmetrical in relation to the longitudinal center line of the said spindle.

3. For use in a shuttle and bobbin assembly of the character indicated, a bobbin-carrying spindle having an end adapted to receive an axially disposed plunger and a spring for projecting said plunger lengthwise beyond the end of the spindle, and a, jawed formation projecting lengthwise from said end of the spindle beyond the plunger when it is in a fully projected position, for cooperation with a pivot pin, the axis of which bisects the longitudinal center line of said spindle, whereby to pivotally retain the spindle to said shuttle.

WALTER LEO WILLIAMSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 344,625 Claus June 29, 1886 731,856 Castor June 23, 1903 793,581 Hartman June 27, 1905 169,505 Wright Nov. 2, 1875 636,207 Kinney Oct. 3l, 1899 FOREIGN PATENTS Number Country Date 467,651 British June 21, 1937 19,556 British 1907

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