US1724257A

US1724257A - of worcester

Info

Publication number: US1724257A
Authority: US
Publication date: 1929-08-13
Anticipated expiration: 1946-08-13

Description

Aug. 13, 1929. A. J. CHEVRETTE 1,724,257

SIDE SLIPPING WEFT DETECTOR FOR LOOMS Filed Dec. 15, 1926 f 5 w 4? IIII I -D 42 INVENTOF? Au'ausfl N I CHEVEE-TTE an indication.

Patented Aug. 13, 1929.

UNITED STATES PATENT. OFFICE.

AUGUSTIII J'. CHEVRETTE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T CROMP- TON 82: KNOWLES LOOM "WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SIDE- SLIPIPING WEFT DETECTOR 'FOR LOOMS.

Application filed December 13, 1926. Serial No.'154,407.

This invention, relates to improvements in loom weft detectors more especially tothe side slipping type, and it is the principal object of the invention to prov de a detector which will not give a false indication of exhaustion if brought in contact w1t h a con,- .ical portion of the yarn of a bobbm.

ft is common practice in many IIllllS to wind the yarn on the bobbins so that a conical surface is presented between the body of the yarn and the butt of the bobbin. When the usual side slipping detector is employed it cannot ordinarily be used so as to slide toward the butt of the bobbin 1n order to give indication because of the fact that the conical surface of the yarn aids the lateral movement of the detector and causes the latter to give a premature indication. 0n the other hand, when the weft is almost depleted it may have a conical surface which tapers toward the bobbin tip, and if the side slipping detector moves toward the tip to indicate, the conical surface'of yarn may cause the detector to slip and give too early it is an important object of my present invention to provide a pairof oppositively moving side slipping weft detectors arranged to operate correctly independently of the conical form of the yarn wound on the. bobbin.

It is a more particular object of my invention to provide a side slipping weft detector mounted on a longitudinally movable carrier held against improper angular motion by the 'controller for the actuator which initiates a change in the operation of the loom, as replenishment.

It is a still further object of my invention to provide a pair of side slipping detectors, each having its own center of rotation, the centers being spaced so as to provide a sufficient angle between each detecting surface without necessitating lengthening of the slot in the front wall of the shuttle through which the detector normally projects on detecting beat-s of the loom.

It is a more particular object of my invention to provide a pair of side slipping weft detectors formed alike but with parts so related that the detectors may be inverted one with respect to the other without interference and yet have the yarn engaging surfaces in horizontal alignment.

\Vith these and otherobjects which will appear as the description proceeds, my invention relates to the arrangements and combinations of parts hereinafter set forth, and more particularly pointed out in the claims.

In the accompanying drawings wherein. a

convenient embodiment of my invention is shown:

Fig. l is a top plan view of my weft detector, parts being in section and the detec- 4, Fig. 1,

Fig. 5 is a vertical section on an enlarged scale on line 5-5 of Fig. 1,

Fig. 6 is a perspective view of one of the detecting elements, and

Figs. 7 and 8 are diagrammatic views showing the relation of the detectors and full and respectively. 7,

Referring to the drawings, the loom frame 10 supports foot 11 of a weft replenishing mechanism more particularly though not necessarily of the multi-color type. Secured to the loom frame is a bracket 12 having an upstanding horn 13 provided with a longitudinal bore let in which is slidably mounted a controller pin 15. A block 16 reciprocat-es vertically in a guide 17 rigid with the bracket 12 and has pivoted thereon an actuator lever 18 one end of which moves vertically in a slot 19 in horn 13 transverse to the bore 14. The left end of the actuator is connected to an upwardly extending link 20. The block 16is given a downward movement on each detectingbeat of the loom when the lay is in its extreme substantially empty bobbins,

forward position and the controller 15 normally lies under the actuator lever 18.

The transferrer mechanism comprises an arm of the usual form having depending fingers 22 which support the lay engaging latch, not shown, by means of which the transferrer is brought downwardly on transferring beats.

' troller pin 15; the latter being held in The detector supporting means includes a stud 23 secured to the stand 12 and hav 35; mounted thereon for limited angular mot a bed 24, said bed being held yieldingly downward position by a spring 25 i posed between the bottom of said bed and fixed part of the bracket 12. An adjust: stop screw 26 limits downward motion or the bed and alfords means for var i vertical position of the detector. Ti ter thus far described, with the excep the particular form of the controller 15, i of common construction and forms no par of my present invention, being sub dantiall the same as the corresponding parts as forth in patent to Ryon :ljchOZ-EOfilEi.

My invention relates more particula l to the bobbin engaging" portion of the do" or and the devices operated therein, a d in carrying my invention into eiiect i provide the bed 24 with a pair of spaced upwardly extending bearings 30 through which e tends a detector carrier 31 which may be formed of tubular or solid stock, preferably circular in cross section. A collar 32 is secured adjustably to the carrier 31 by screw 33, said collar being located the bearings and receiving the thrust of a compression spring the r bearing 30. The carrier 31 project wardly from the forward bearing an; extended therethrough the bent end relatively to the carrier by screw this construction it will be seen that l troller wire 15 prevents angular mo of the sliding carrier 31 because of the that the end of the controller which e the bore 14 is to one side of the center or tors to be described hereinafter e alw s maintained in proper angular pOSlilOD With respect to the bobbin being demetedv The means for withdrawing the detector on transferring beats of the loom comprises a wire 36 secured to the upper part of C; 32 by screw 37, said wire extending wardly over the carrier 31 and then to the left as at 38 in Figs. 1 and 3 to be in front of one of the fingers 22. As the latter moves forward at the time of transfe" the ca rier is advanced and the controller pin moved from under the lever 18 and the d tecting elements about to be described are withdrawn from the path of the incoming bobbin.

That portion of the detecting element which has direct engagement with the surface to be detected comprises a pair of side slipping elements, each moving about an independent center fixed on carrier 31. itef-erring-to Figs. 1, d and 5 it will be seen that have broadened the rear end thereof so to have lateral extensions 41. The detector elements are substantially the same, one of which is shown at d2 in Fig. 6. Each detector is formed preferably, though not necessarily, of sheet metal and has a horizontal body portion a3 and a vertically extending roughened yarn engaging portion M on the rear end thereon, while the forward end is bent back on itself as at a5 and has aligned openings 46. A pivot pin i? is secured in the plate 40 and passes through the aligned openings 46, forming a pivot for the detector. Both detecting elemen s are the same, but in assembling i find it advantageous to have the horizontal portion 43 of one of the detectors extend from the underside of the plate 40 and a horizontal pornoof the other detector extend from the upper side of said plate, the purpose being to avoid interference between said portions 4:23 a d to permit free and uninterrupted swinging of the detectors about their piv The height of the yarn engaging portion such that both detecting surfaces are in substantial horizontal a ignment.

in order to hold the detectors yieldingly in the full line position shown in Fig. 1, there are provided a pair of springs i3, one for each detector, said springs being interposed between prongs 49 on the carrier an the detectors hold the latter yieldin in nonial posit-ion. These springs are indcpe dent of each other and permit each de tector to move independently of tin. thcr.

Under normal conditions, when a suineient supply of weft is present, the teeth of the vertical portions of the detectors will be embedded in the yarn of the surface to be detected and a swinging movement of said detectors will be prevented, the lay moving the carrier forwardly against the action of spring to move the controller from under the actuator 18. The latter will therefore move downwardly without interruption and the link 20 will remain at rest. lVhen insuilicient weft for continued weaving is present, however, the detecting elements 42 will slide along the bobbin B to the position shown in dotted lines in Fig. 1, the carrier 31 and controller 15 remaining at rest so that the downward movement of the i "ht hand end of actuator 18 is interrupted mus requiring the link 20 to be depressed to initiate replenishment as set forth in Patent #1,O30,7 l8. v

As shown in Fig. 7 one of the detectors aligned with the conical part of the bobbin and would slide to the left, but the other detector engages the cylindrical body of the yarn and false indication is prevented. Also, in Fig. 8, oneof the detectors is aligned with the conical part of a small bunch of yarn, but the angle is reversed from the previous condition and the detector is held against a false indicating movement. The detectors must both move to indicate and this movement does not occur until the yarn is'almost depleted.

A further feature of my invention relates to the fact that the detecting element may be inverted so as to assume a different angular position with respect to the bobbin. By disconnecting the controller and loosening the screw 33 the tubular carrier 31 can, be turned through 180 relatively to the stand or support 30. .This will permit the detecting element to be given a different set ting relatively to the fixed setting.

From the foregoing it will be seen that I have provided a very delicate form of weft detector having a pair of oppositively moving detecting elements, at least one of which must have direct engagement with the surface to be detected oneach detecting heat of the loom. If the bobbin be formed so that the detector extending to the left is out of engagement with the bobbin, the detector extending to the right will nevertheless engage the yarn and being restrained will move forwardly to prevent indication of weft eXhanstion. If, on the other hand, as exhaustion approaches, the bunch of yarn remaining on the bobbin is tapered toward the right to engage the detector extending to the left, but not the one extending to the right, indication will likewise be prevented. It will be seen that it is necessary for both detectors to be free to move and that a conical surface of yarn opposite either detector will not .cause indication, although if one detector alone were used a false indication might result. detectors are identical in construction but are so formed that they can be reversed, one

above and the other below the plate a0 and that the yarn engagin surfaces are disposed as to be in the same horizontal plane. It will. also be noted that the controller wire 15 serves to hold the carrier Bl and the detecting elements in proper angular position.

Having thus described my invention it will be apparent 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:

1. In a weft detecting mechanism for looms, a carrier yieldably held in detecting position, and a pair of substantially similar detecting elements, a pivotal connection on the carrier for each element, each element having a yarn engaging surface and the pair of yarn engaging surfaces being in substantially horizontal alignment, each element having a portion to cooperate with the pivot of the carrier and having connecting means between the yarn engaging and pivoting per tions, said elements being one reversed with respect to the other so that the yarn engaging Furthermore, it will be seen that theand pivoting portions may lie in" substan tially the same planes but the connecting portions will lie in different planes to avoid interference between the movements of the detecting elements.

In a weft detecting mechanism for looms, a fixed support, a carrier rotatably mounted in the support to. assume two dilfer ent angular positions relatively to the support, said carrier being slidably mounted in the. stand to move in a direction toward and from the surface being detected and a detector element pivoted on the carrier and having a detecting surface offset from the axis of the carrier, said detecting surface to be operatively disposed todetect for weft presence when the carrier is in eitherangular position relatively to the support.

3. In a weft detecting mechanism for looms, a stand, a carrier mounted in the stand for rotation relatively to said stand, said. carrier being slidably mounted in the stand to move in a direction toward and from the surfacebeing detected a pair of detectors moving in opposite directions and each having a detecting surface, said carrier capable of assuming two angular positions relatively to the stand so that the line join: ing the detecting surfaces may assume two positions relatively to the surface being detected. I

4. In a weft detecting 'mechanism for looms, a stand, a carrier mounted in the stand for rotation relatively to said stand, said carrier being slidably mounted in the stand to move in a direction toward and from the surfacebeing detected, a detecting element. movably mounted on the carrier,

said carrier and element being movable relatively to the. stand to assume two angular positions with respect thereto, and loom controller means operatively related to the carrier to hold the latter against angular move-- ment relatively to the stand in whichever angular position the carrier may be relatively to the stand.

5. In a weft detecting mechanism for looms, a stand, a carrier mounted in the stand for rotation relatively to said stand, said carrier being slidably mounted in the stand to move in a direction toward and from the surface being detected, a weft detector pivotally mounted on the carrier to move in a plane substantially parallel to the axis of the carrier, said carrier capable of assuming two dilferentangular positions relatively to the stand in each of which the detector is disposed for operative detecting coaction with the surface to be detected, and controlling means for the loom to hold the carrier in either of its angular positions relatively to the stand.

6. In a weft detecting mechanism for looms, a stand, a carrier mounted in the stand for rotating relatively to said stand,

lOO

said carrier being slidably mounted in the stand to move in a direction toward and from the surfacebeing detected, a weft detector pivotally mounted on the carrier to move in a plane substantially parallel to the axis of the carrier, said carrier capable of assuming two different angular positions relatively to the stand in each of which the detector is disposed for operative detecting coaction with the surface to be detected, controlling means for the loom to hold the carrier in either of its angular positions relatively to the stand, and a guide for the controller fixed relatively to the stand.

7. A detecting element for a weft detecting mechanism comprising a substantiall flat body portion, a yarn engaging detecting portion extending from one side of the flat body portion in a directionsubstantially perpendicular to the flat body portion, and paid element also having at the end thereof opposite the detector portion another portion extending from the flat body on the same side thereof as the detector portion and having provision to receive a pivotal support.

In a weft detector for a loom having a lay and a surface to be detected, a support held in fixed position, a carrier rotatably mounted in the support to assitin'ie two different angular positions relatively to the support, a pair of side slipping weft detectors, a pivot for said detectors mounted on the carrier, each detector having a detecting surface offset with respect to the pivot, the carrier and detectors moving forwardly and rearwardly in a line substantially perpendicular to the axis of the surface being detected, said detectors at exhaustion of weft moving transversely of the axis of the carrier and along and in contact with a denuded bobbin, said detectors being also capable of detecting weft presence in either angular position relatively to the support.

9. In a weft detector for a loom having a lay and a surface to be detected, a support held in fixed position, a carrier rotatably mounted in the support to assume different angular positions relatively to the support, a

pair of side slipping weft detectors, a pivot for said detectorsmounted on the carrier, each detector having a detecting surface off set with respect to the pivot, the carrier and detector moving forwardly and rearwardly in a line; substantially perpendicular to the axis of the surface being detected, said detectors at exhaustion of Weft moving transversely of the axis of the carrier and along and in contact with a denuded bobbin, said detectors being also capable of detecting weft presence in any angular position relatively to the support, controlling means for the loom to hold the carrier in any of its angular positions relatively to the stand, and a guide for the controller fixed relatively to the stand.

10. In a weft detector for a loom having a lay and a surface to be detected, a sup-port held in fixed position, a carrier rotatably mounted in the support to assume a plurality of different angular positions relatively to tae support, a pair of side slipping weft detectors, a pivot for said detector mounted. on the carrier, each detector having a detecting surface offset with respect to the pivot, the carrier and detector moving forwardly and rearwardly in a line substantially per 'iendicular to the bein detected, saiddetectors at exhaustion of weft moving transversely of the axis of the carrier and along and in contact with a denuded bobbin, said detectors being also capable of detecting weft presence in any angular position relatively to the support, and controlling means for the loom to hold the carrier in either of its angular positions relatively to the stand.

In testimony whereof I have hereunto affixed my signature.

AUGUSTIN J. CHEVRETTE.