US3532136A

US3532136A - Organs for grasping woof threads in inserting elements of stationary woof frames

Info

Publication number: US3532136A
Application number: US740934A
Authority: US
Inventors: Ramon Balaquer Golobart
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-07-13
Filing date: 1968-06-28
Publication date: 1970-10-06
Anticipated expiration: 1987-10-06
Also published as: FR1571925A; DE1760558A1; ES343664A1

Description

United States Patent Inventor Ramon Balaquer Golobart Calle Valls y Taberner 11, Barcelona, Spain Appl. No. 740,934 Filed June 28, 1968 Patented Oct. 6, 1970 Priority July 13, 1967 Spain No. 343,664

ORGANS FOR GRASPING WOOF THREADS IN INSERTING ELEMENTS OF STATIONARY WOOF FRAMES [50] FieldofSearch ..l39/122 127 [56] References Cited 7 UNITED STATES PATENTS 3,140,731 7/1964 Jones... 139/126 FOREIGN PATENTS 1,391,346 1/1965 France 139/122(N) Primary Examiner-Henry S. Jaudon Attorney-Christen & Sabol ABSTRACT: A gripping mechanism for pulling the weft 5 Claims 7 Drawing Figs thread through a loom is mounted on the lay beam of the loom U.S. Cl 139/122 and is provided i h j mem rs actuated by cam Int. Cl D03d 47/20 mechanisms at opp site ends of the laybeam.

Patented Oct; 6', 1970 3,532,136

Sheet 1 of8 Patented Oct. 6, 1970 3,532,136

shed ofa loom.

Elements for .inseningweft threads includeaiance, rod or flexible strip, which is reciprocatorilyrnovedthrough the sh ed of a loom to whose front end can be attaohed various types of mechanisms for gripping the weft thread, such as a hook, a loop or a clip. 7

These inserting elements usually need foroperatingthejaws h t ma th e t r d p n pe oh omplic e mechanisms in the area of gripping the weft thread at the mouth of the inserting element or else, must use remotecontrols; all of these arerather b ulky andheavy, which ..eause difficulties in applying other elements that arevital fonmalring cloth, such as selvage makers, cutting elements, suction elements, etc., and lead to diff culties in catching .the weft h eads w th dan o .de'hes the w e e d heh said mouths or jaws" pass thro responding mechanisms.

h Pr se i veh e h m a e m nati th ee rawhaeks and the lack of safety ,by performing with absolutereliability the task of the gripping mechanism, by,means @dfllicethat is extremely simple and free vof flaws, that does away completely ,with remote controls, that operates with great simplicity, that can be applied to any type of insertionkelement, whetherthey are rigid, .for exa mp l e, a rod or lance, or flexible, as for example asthip or band, and that ,inno way prevents the application of other elements that are vital for making cloth, such as selvage formers, cutting and suetion elements, etc While a the e met me de w th ehvd hserq sl mage o h w p h eaqe whe th ipp ng lement p se throu the shed. v r

The device, which is the object of the present invention, is m d up of e sh ppi m hanism with h el hs te b s i e a bayonet which in the vicinity of its tip has attached a stop of ugh the shed .with their cor;

y ieldablc material whichmakes up a stationary jaw, andiapx m te i h set ler 9 th en h r said ele ates bas there s a lie e Pi w i h piv tally's ppsrt a woar e e the end of the front arm of the lever serving to make the movable jaw press the weft threads against the yieldable stop, and the end of the back arm of said layer carrying a hinge joint for a rod, the free end of which is introduced so as to slide in a housing housed in a hinge joint ofa member that is fixed to the lengthened base, the rod-hinge joint unit being actuated by a recoil helicoidal spring that automatically causes the oscillation movement of the lever in both directions, for opening and closing of the mobile jaw. Said bayonetlike elongated base is also covered with a protecting shield along its whole length, which prevents, as it passes through the shed, the elements of t s pi theehhhi from eve n t e a p h ehd and damaging them.

- k The e d O p te t e ti of the e h ted ase an he fi m y.

attached to any type of inscrter element, whether it is rigid, as for example, a rod or lance, or flexible, for example, a strip or band.

For a better understanding of the invention, there is described below, with reference, to the accompanying drawings an embodiment by way of nonlimiting example.

FIG. 1 is a perspective view of the gripping mechanism in p h es t e ehteh h e t ea with. the P otes e fe the warp threads cut away along its entire length for greater visibility ofthc components.

2 is per ee v f st ppihsme h hism of FIG. I, also in closed position with the protector for the warp threads cut away.

G- 3 s per pect e f he g pping, m c nism. e responding to FIG. 2 but with thef protcctor for the warp threads in place.

FIGS 4 and are details of the spring-rod unit in the open, and closed positions ofthe mobile jaw ,2 FIGS .,6,and. 7 are schematic plan views of the operation of the gripping mechanism on each side of the loom, with the protector forthe .warpthreads cut away along its-cntire=lerigth for greater visibility of the components.

.In these figures, the gripping mechanism comprises a iengthened -bayonetlike shaped base, indicated ,bymimeralj'l providedlwith lengthwise wings Zand 3 bentrat right angles along one side and witha lengthwise wing 4, also.at ri ght an .gles, but on the opposite side, the latter being bent :again at rightangles, at a. slight distancerabove the base to overlie ,itin parallel relationship to constitute aiprotector -5,,for the 'warp threads, having ,c utouts ,6, FIG. 3, which besides eliminating weight, provide an outletfor dust orchaffwhichthe:repeated contactwiththeweft thread.7. can cause. I

The base and thewingdqboth ,terminateatthe forwardend in,a p oint 8 and adjacent;this.end,there1is attached-to the base ,a stop .9, made of a relatively yieldable material; positioned against the wing 4 to constitute thestationary jaw of the gripping mechanism. Alever 11 1, having opposing arms lZand l 3 is supportcd at a medialpoint for pivotal movementon a pin -l0 at tached ;to,the base at a distance from its'forwardrend 8. The arm 11:2terminates in a slightly curved ,clawtshapedgportion 15 .havingan irregularly curved surface :on-its innerrcon- ,vex portion whichcoacts with a complementariiyformed surfaceon the stop-9 ,tograspa weft thread7. Thetotheranm 13 of the lever terminates in a horizontal flat surface l-l6;having a margin on the outwardly facing side which rtapers inwardly (for a purpose which will be explained later) and Qanendmar gin which is provided with ,an inwardly curved recess 17 to serve as a bearing for the ball shaped end portion IS-of a rod 19. The other end 20 of this rodis slidablyrcceivedwina bore provided in a small housing 2'! which housing has a generally spherical end surface which is, .in turn, received in .a horizontally extending curved recess';2 2 formed in transversely extending member 23 attached to base land spaced, rearwardly from the .end 16 0! the pivotal lever 11. I

Rod 19 is surrounded by ,a recoil helicoidal spring 24, the ends of which bear respectively against the end portion 18,02 the rod and the housing 21 and, since the spring is under compression, tends to urge the housing 2I away from the end portion 18 at all times.

The rod 19 and the cooperating spring 24 act as a snap-action device which not only holds lever 11 in each of its two extreme positions, as exemplified respectively in FIGS, 1 and 2, but causes the lever to move almost instantaneously from one of these two positions to the other without noticeable delay.

The end 27 of the base 1 is provided with openings 30 to receive fastening members, such as screws 29, for attaching the gripping mechanism to a reciprocating arm 28 of a loom.

The operation is as follows:

During weaving of the cloth, the gripping mechanism, controlled by arm 28, FIG. 6, is introduced into shed 36 to engage the end of the weft thread 7 coming from a bobbin 37, with movable jaw 1,4 separated from stationary jaw 9, or in the open position, until it reaches the feed side of the loom, where the outer curved part of the movable jaw 14 hits stop 31, u ed n loom fra e of housing Zl against the force of spring 24 until a medial point is reached between the extreme positions of the lever, at

which point no further shortening of the distance between housing 21 and the ball shaped end 1 8,.wili occur. During all of the pivotal movement of lever 11 the ball shaped end 18 will merely pivot in the recess I7 but the spherical housing Z lv at the other end of the rod, which was located at the outer end. of. curved recess 22 at the st t? of movement of the lever (FIG. 5), will not only pivot on the surface of the recess but will also engage in a. slight transverse shifting movement in the recess (FIG. 4,) at about. the time the spring Ztthas reached maximum compression due to, shortening of the distance between the end portions. of rod. 1 9. At this position the pivot: point represented by recess 17 will pass. over a line extending;

between the pivot point represented by housing 21 and the pivot point of lever 11, allowing the spring 24 to begin ex-,

pansion and urge the free end of rod 19 to slide out from the bore in housing 21 and in the process quickly continue the further clockwise movement of lever l 1 until the end 16 of the arm has reached its extreme position, as shown in FIGS. 4 and 7, with the movable gripping jaw 14 in engagement with the stationary jaw 9 and gripping a weft thread 7 therebetween.

When the gripping mechanism, controlled by arm 28, pulling weft thread 7, returns and is introduced again into shed 36 and reaches the other side of the loom, FIG. 7, the projection of butt end 16 of arm 13 of lever 11, strikes stop 35 housed in loom frame 34, again causing compression and expansion of the recoil spring 24, and shifting of housing 21 but in the opposite direction, forcing end 20 of rod 19 to move in side its housing 21 and causing the instantaneous separation of mobile jaw 14 from stationary jaw 9, releasing weft thread 7. When the gripping mechanism makes its return trip, loose end 33 of weft thread 7 will slip through claw 15, said weft thread 7 being completely inserted along the entire length of the shed.

The details and characteristics used in embodying the objects of the present invention may be-varied in accordance with the scope of the invention, and also the recoil helicoidal spring may be replaced by two facing magnets, located in the side wings of the lengthened base, all still being within the scope of the invention, as defined in the annexed claims.

I claim:

1. In a weft gripping means for a weft inserting element of a loom, the combination comprising an elongated base, one end of the base being provided with a bayonet-shaped tip, a stationary jaw on said base adjacent said one end, a doubleended lever pivotally mounted at a medial point on said base, one end of said lever having an arm provided with a movable 5 jaw coacting with said stationary jaw for gripping a weft thread therebetween when in gripping position, and spring means connected between said lever and said base for urging said lever selectively in either direction to hold said movable jaw in gripping or nongripping position.

2. The invention defined in claim 1, wherein said spring means includes a rod and a recoil helicoidal spring surrounding said rod, one end of said spring being connected with said double-ended lever, the other end of the spring being connected with said base.

3. The invention defined in claim 2, wherein said lever is provided with a recessed portion for receiving one end of said rod in swinging abutting engagement therewith, and said base is provided with housing means within which the other end of said rod is received in swinging and longitudinally slidable engagement.

4. The invention defined in claim 1, wherein said one arm of the lever is curved for engagement with a stop, said stop being provided at one side of a l'oom to urge said lever toward the gripping position.

5. The invention defined in claim 4, wherein the other end of said lever is curved for engagement with a second stop, said second stop being provided at the other side of a loom to urge said lever toward the nongripping position.