US1895781A - Thread holder for weft replenishing looms - Google Patents

Description

Jan. 31, 1933. H BURTON THREAD HOLDER FORWEFT REPLENISHING LOOMS Filed March 22, 1932 snuentor Harm) H Burton 4 v (in. ornegs Patented Jan. 31, 1933 UNITED, STATES PATENT OFFICE HARRY n. BURTON, or wnBsTRR, MAssAcnUsn Ts, nssreivo To c oivirToN a KNOWLES Loom woRKs, or woncEsTRn, MAssAcnUsnTrsqA co PoR TIon on] MASSACHUSETTS THREAD HOLDER FOR WEF'I nnrtnn snine Looms Application filed March 22, 1932. Serial No. 600,461.-

This invention relates to improvements in weft end controllers for weft replenishing looms and it is the general object of the invention to provide means for preventing reverse movements which would permit the thread ends to become slack.

In one form of thread holder adapted more particularly though not necessarily to multicolor weft replenishing looms there are provided travelling surfaces. which have frictional engagement with the weft ends extending from the reserve bobbins. A vibration motor is provided to drive these friction ,surfaces in such a direction as to keep the threads. taut. In the construction of the motor there is a pawl to co-act with a ratchet, vibration of the loom operating through a weighted mass to give the pawlworking strokes. If

the pawl, which'inisome instances is made; in the form of alight leaf spring, is movedfrom its normal position to a position on the opposite side of a line joining the axis of the rotary ratchet and a point adjacent the anchorage'of the pawl on the weighted mass.

the ratchet together with the travelling friction surfaces will move in the opposlte dlrection and therefore slacken the weft ends,

defeating the purpIose for which the mechaa nism is devised. 11 certain other instances the pawl whenthrownto its lmproper position will lock the travelling surfaces 'so that they are not free to perform their proper functions.

It is an important object of my present invention to provide means which will .pre-- vent the actuating pawl from moving to a position which will permit 'it to produce of the device .ation I i With-these and other objects in. view. which.

will appear as the description proceeds,.myz, inventlon resld-es 1n the combination and. ar

and 1 rangement of parts hereinafter described set forth in the claims.

Inthe accompanying drawing, wherein a.- convenlent embod ment of my invention. is

set forth, A c Fig. 1 is'a front elevationof a. portion of the loom having appliedythereto' the .form of thread holder towhich my invention; relates,

Fig. 2 is an endelevation, on'an enlarged scale taken in the direction of arrow 2, Fig. 1, Flg. 3 1s a horizontal section on line 3-3;

of Fig. 2,

Fig. {L is an end removed and showing the preferred form of my invention, and, 1

' Fig. 5-is a view similar to Fig. 4=rbut showing a modification of my invention. Referring to Fig. 1, I have shown a loom frame 10 and a magazine 11 preferably' of the multicolor type provided with reserve bobbins 12 from which extend the weft ends. W. The tie rodl3 forming a part-of the magazine has secured thereto an arml f -which projects outwardly and downwardly as seen inFig. 1.

n A foot 15 on the arm 14 supports'a casing or box 16. A weight 17 is mountedwin the box on the bottom of two upwardly extending springs or resilient supports 18 which are in turn supported by nuts 19. to the frame of the box. "As shown in Fig. 4 a'pawl 20 may extend from the left hand end of the weight toward the right hand end to have engagement with a ratchet wheel 21 mounted on a as a whole "during oper;

elevation taken in the direction of arrow .4, Fig. 3, with thev cover shaft 22. The latter has a bearing 23 formed as part of the casing and has secured to the outer end thereof a thread tensioner 24 toothed as shown in Fig. 2. 1 i

The tensioner 24 meshes with the teeth of a second tensioning member 25'mounted on an adjustably positioned shaft '26. The

shaft 26 extends through a bearing 27 sepa-.

rate from the casing and extending through a horizontal slot 28, and the horizontal posi-x tion of the bearing member 27 can be ad justed by means ofscrews'29 which extend through slots 30 in thebearing and are threaded into the box. The toothed members 24 and are mounted to rotate freely so that a comparatively slight force is needed to turn them, and they moves to the. right as viewed in Fig. 4 the Q ratchet will'be given a slight rotary move ment. 'Whilethe members 24 and 25 must be free to respond to the vibrational'force of the weight 17 yet they are suificiently resistiveto retrograde movement to retainthe 2 position they occupy when the pawl 20 is at the end of its working stroke. This can be. accomplished by the fit of the shafts in their bearings or by means of a friction plate s 32 interposed between the box 16 and the I lleft'jhand facesof the members 24 and 25, as

shown-in F ig.- 3. Duringcontinued opera tion of the loom the toothed members'are rotated in opposite directions as suggested by the'arrow A in Fig. 2 to exert a downward 35 pull on the threads r s The matter thus far described of itself forms no part of my present invention and may be substantially the same as shown in prior applications bearing Ser. Nos. 47 8,429 and 569,586 to which reference may be had for a fuller-understanding of the construetionand operation ofthe mechanism I In carrying the preferred form of my in- M vention into effect I provide an extension 50 erably adjacent the ratchet 21 and as shown in Fig. .4 over the ratchet engaging end of the pawl 20. The finger is sopositioned as to permit free working strokes of the pawl but is positionedto prevent the working end of the pawl from moving above a line joining the axis of shaft 22'and the left hand end of the pawl adjacent the point where the 7 latter is secured tothe weight 17, thus giving assurance that the ratchet together with the members 24 and 25 willalways rotate in the,

proper direction; Sometimes in clearing the thread holders of undesired threads or in drawing down the weft ends so that they will be sufficiently taut the operator will turn one or the other of'the toothed members 24 or 25 by'hand and if'an' attempt should be made to turn these members inthewrong direction'the finger 51 will'act as an'ef'fective 1' stopgforthepawl and prevent such move-- havinga finger 51 which is positioned pref-f heretofore, except that instead 'of thefinger 51 there is providedfa pawl 60 which isan extension of the resilient-hanger 61 for the weight 17 The nut62 holds the resilient hangerin' place and also'positions the restraining end of the stop pawl 60. A lug63 rigid with the box 16 prevents buckling of the spring pawl so that the latter is always operative to preventretrograde"movement of the;- ratchet-21 even though the pawl 20 should" move to J the dotted line :positionshown ;in Fig. 5.,

From the foregolng it will be seen that Iv have provided a's'imple means to' prevent the pawl from assuming such, a relation wlth rement; It will be observed from Fig. 4 that the spect to the ratchet as will result in retrograde movement'of the members 24 and 25.

In the preferred form any'su ch retrograde movement will ultimately move the operating end of thepawl against the finger'51, after which further retrograde movement will be prevented, whereas in the modified form the pawl 60 operates to prevent retro-i grade movement of'the ratchet even though the driving pawl should become/improperly positioned. It is to be understood that the form shown in Fig. 5 is but one of several forms of stop ratchets which may be used;

but as shown herein as-part of' one of the resilient supports for the actuating weight. It

is to be understood that aslight amountiof retrograde movement can properly take-place in both forms ofthe invention, but what I:

aim to prevent is a-substantial retrograde movement which would have the 'efl'ect'of turning the geared members 24 and 25 sufficiently to move the weft ends W in a reverse direction. c

Having thus described my inventioniit will be seen that changes and modifications may be made therein by those skilled in the'art without departing from the spirit and scope of the invention and I do not wish to be limited to the details'herein disclosed, but what I claim is: a I

1. In a m thread holder having a travelling thread engaging surface and a vibrat ing mass, a'ratchet operatively connected to the travelling surface, a pawl carried by the vibrating mass to engage the ratchet and means to prevent the pawl'from giving the ratchet a substantialv retrograde movement.

2. In a loom thread holder having a travv elling thread engaging surface and a vibrating mass, a ratchet operatively connected to the travelling surface, a-p'awl'moving with mal operation to give the ratchet a direct feeding movement, and means to prevent said pawl from giving the ratchet a substantial retrograde movement.

3. In a loom thread holder having a travelling thread engaging surface and a vibrating mass, a ratchet operatively connected to the travelling surface, a feeding pawl effective normally to move the ratchet in a direct movement, a stop pawl to engage the ratchet and prevent retrograde movement thereof, the first named pawl effective to give the ratchet a direct movement.

4. In a loom thread holder having a pair of coacting thread engaging elements, a bearing member for one of said elements capable of movement to locate said elements at different distances from each other, a vibrating weighted mass, a ratchet movable with one of said elements, a pawl movable by the vibrating mass to engage the ratchet and effective to give the latter a direct feeding movement, and means carried by the bearing to limit movement of the pawl in one direction and thereby prevent the pawl from giving the ratchet a retrograde movement.

In testimony whereof I have hereunto affixed my signature.

HARRY H. BURTON.

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