US3376899A - Selvedge forming means in looms weaving two fabrics simultaneously - Google Patents

Description

April 9, 1968 J. TUBAU QUINTANA 3,376,899

SELVEDGE FORMING MEANS IN LOOMS WEAVING TWO FABRICS SIMULTANEOUSLY Filed Jan. 12, 1966 3 Sheets-Sheet 1 INVENTOR JUA/V 77/840 QU A ZM/A April 1968 J. TUBAU QUINTANA 3,376,899

SELVEDGE FORMING MEANS IN LOOMS WEAVING TWO FABRICS S-IMULTANEOUSLY Filed Jan. 12, 1966 3 Sheets-Sheet 2 INVENTOR JUAN 7019,40 Ql/l/VfiJ/VA April 9, 1968 TUBAU QUINTANA 3,376,899

SELVEDGE FORMING MEANS IN LOOMS WEAVING TWO FABRICS SIMULTANEOUSLY Filed Jan. 12, 1966 5 Sheets-Sheet 5 INVENTOR. \JUAN JUBAU QUINTANA BY *1; d yew AGT United States Patent 3,376,899 SELVEDGE FORMING MEANS IN LOOMS WEAV- ING TWO FABRICS SYLMULTANEOUSLY Juan Tubal: Quintana, :Calle de Sta. Joaquina de Vedruna 1, Berga, Barcelona, Spain Filed Jan. 12, 1966, Ser. No. 520,241

Claims priority, application6Spaiu, Jan. 23, 1965,

3 Claims. (a. 139-44 ABSTRACT OF THE DISCLOSURE A selvedge forming device for shuttleless looms for producing two parallel fabrics simultaneously comprises two grid-like selvedge-warp thread guiding frames arranged in parallel relationship and adapted to effect respective reciprocating movements in opposed sense for imparting to the selvedge-warp threads corresponding lateral displacing and crossing movements in order to interlace them with the respective weft threads so as to form compact selvedges in the two fabrics.

In horizontal and vertical shuttleless looms adapted to produce two parallel fabrics simultaneously, selvedge formation causes difficulties, chiefly because of the shortage of available space between the two fabrics; the conventional selvedge-formin g mechanisms cannot be received between the two fabrics without interfering with one another in a way likely to reduce operating speed and cause stoppages of the loom.

This invention obviates all these disadvantages and enables the single loom to produce two parallel fabrics simultaneously even when the distance between the two fabrics is very reduced, down to the extent that the impression is given that only a single fabric is being manufacturedv Consequently, a loom of this kind requires no more working space than does any conventional loom.

In the improvements according to the invention, a sup-port member is disposed at a stationary part of the loom on each side of fabric width and comprises a first grid-like frame and a second grid-like frame for forming two selvedges simultaneously in two fabrics, the frames being disposed one opposite another and being adapted to slide between one another, towards and away from one another, towards the warp yarns of the selvedge and being operated either by the loom healds or by means of cams or by any other known system, the function of one of the frames being to move towards and away from one another the warp yarns of the selvedge of the two warp layers of the same sense of the two sheds, while the function of the other frame is to move towards and away from one another, and gradually shift laterally, the warp yarns of the other two warp layers of the same sense of the two sheds of the selvedge, the two frames each como prising a gridor mesh-like system of bars which are alternately long and short and which are provided according to the number required by selvedge width and which are connected at one end to the base of the corresponding frames and which are provided at the other and free end with twoyarn-guiding passages or orifices or the like through which the warp selvedge yarns extend to form the two selvedges, one for each fabric.

Each of the frames-both the convergent and the divergent-is guided in its respective support member by means of a rod slidable therein, opposing springs being provided for each frame to produce return movements 3,376,899 Patented Apr. 9, 1968 opposed to the operating movements in both the frames and simultaneously with later-a1 reciprocating displacements of one of the two frames, in order that, as the two frames move towards one another with their corresponding bars and with the resulting slight lateral shift of one of the two frames, the warp selvedge yarns of each shed cross at each pick through the shed, so that when the weft is wrapped around, two selvedges, one for each fabric, are formed.

The bars of the two frames, of two different lengths, are inserted in parallel manner and by pairs, a short bar alternating with a long bar in each frame, the difference in length at the centre of the yarn guides corresponding to the distance existing between the two layers of the same sense of the two warp sheds, the longer bars of a frame coinciding in their approach movement with the shorter bars of the opposite frame while the shorter bars of the first frame coincide in their approach movement with the longer bars of the second frame, the arrangement of the yarn carriers with which the bars are formed for the selvedge warp yarns leading to two sheds and therefore to two selvedges, one for each fabric. Consequently, as the frame performing the straight movement towards and away from the other frame operates, the pairs of bars of the rectilinearly moving frame move towards one another the selvedge yarns of one warp layer of one fabric and the selvedge yarns of the warp layer of the same sense of the second fabric, and the opposite frame performing the movement towards and away from the other frame with the slight lateral shift also moves towards the rectilinearly moving frame, and the pairs of long and short bars of the non-rectilinearly moving frame move towards one another, but with a lateral shift, the remainiug selvedge yarns of the warp layer of opposite sense of one fabric and the remaining selvedge yarns of the warp layer of the latter sense in this second fabric. The yarn guides of the long bars of the rectilinearly moving frame are adapted to cross over and pass beyond the short bars of the opposing frame which performs the slight lateral shift, and simultaneously the yarn guides of the short bars of the rectilinearly moving frame are adapted to cross over and pass beyond the long bars of the non-rectilinearly moving frame, so that two warp sheds are formed for the selvedges, one for each fabric, and when the weft yarns corresponding to each fabric pass through such sheds, in alternate relationship with the rectilinear approach and separation movement-of one frame and the approach, separation and slight lateral shift of the other frame simultaneously, the warp yarns of the selvedge of each fabric are interlaced with the or each weft yarn of each fabric.

At the next pick of the or each weft yarn through the two sheds and at the approach of the rectilinearly moving frame and the non-rectilinearly moving frame, the shift thereof now being in the opposite direction to the shift performed during the previous pick, the warp yarns of the selvedge of one warp layer of one fabric and the warp yarns of the selvedge of the other layer of the 8?.1'116 sense of the second fabric take up a position on the opposite side in respect of the previous pick, so that when the weft yarns are introduced through the two latter sheds formed one each by each fabric the weft yarns of each fabric are interlaced with the warp yarns of each fabric, the lateral crossover to both hands of the warp selvedge yarns with their respective weft yarns leading to the formation of compact selvedges in the two fabrics,

For a better understanding of the invention a description will now be given of an embodiment thereof, reference being made to the accompanying exemplary drawings wherein:

FIG. 1 is a plan view of the system in the normal position;

FIG. 2 is an inverted plan view of the system shown in FIG. 1;

FIG. 3 is a plan view of the system during the first phase when the two frames are moving towards one another and one of the frames is performing a slight lateral shift;

FIG. 4 is a plan view of the system in the second phase in which the two frames are moving towards one another and one frame is performing a slight lateral shift, but in the opposite direction as compared with FIG. 3',

FIG. 5 is a view in side elevation of the system at some time during formation of the two sheds, and

FIG. 6 is a perspective view of the device embodying the invention, shown assembled to a shuttleless loom adapted to produce two parallel fabrics simultaneously, only fragmentary parts of the loom being illustrated.

Referring to FIGS. 1 and 2, the selvedge forming mechanism according to the invention is secured to a stationary part of the loom frame by means of a lug or the like 1 and screw 2. The lug 1 is rigidly connected to a support member 3. Mounted at the other end of the support member 3 to form a right-angle therewith is a plate 4 formed with a circular guide orifice 5 and with a rectangular slotlike guide orifice 6. A small right-angled support member 7 is formed on the support member 3 at the end near the lug 1 and comprises two parallel plates or the like 8, 9 each formed with a slot 10, 11 through which journals or pins or the like 12, 13 of a slide block 14 extend. The slide block 14, which can be seen in FIG. 5, is rigidly connected to an arm 15. Said arm is formed to include two lateral projections 16, 17 enabling the arm 15 to be actuated laterally from either side. The arm 15 extends through the rectangular orifice 6 in the plate 4, and the other end of the arm 15 has secured to it a plate 18 forming part of a frame A. Said frame A is comprised of long bars 19 and short bars 20 mounted on plate 18.

Two opposing helical springs 21, 22 have one end secured to the pins or the like 12, 13 and the other end secured to the small right-angle support member 7, for return movement purposes.

Registering with the circular orifice or passage 5 is a guide 23 in which a rod 24 can perform a parallel sliding movement. Secured to the end 25 of the rod 24 is a plate 26 forming part of a second frame B comprising external membering 27 and long and short rods 28, 29, respectively. Opposing helical springs 31, 32 have one end secured to the plate 4 and the other end secured to a cross beam 33 to provide the return movement for the second frame B.

FIG. 3 shows the phase in which the two frames A, B are moving towards one another, the movement of the frame B being a rectilinear converging movement-produced by thrust on the cross beam 33 which transmits its movement to the rod 24, the same being rigidly connected to and perpendicular to the cross beam 33 and being guided to ensure its rectilinear movement in the orifice 5 and the guide 23 of the plate 4 (FIG. 2). The frame A performs a converging movement plus a slight lateral shift or deviation in one direction, such deviation being produced by actuation of the lateral projections 16 and 17 to tilt the arm 15 to the extent permitted by clearance in the slot 6. As a result of such action the yarn guides 34 of the long bars 28 and the yarn guides 35 of the short bars 29 of frame B have crossed from one side to the other and passed beyond the yarn guides 36 of the short bars 29 and the yarn guides 37 of the long bars 19 of the frame A. The crossing of the warp yarns of the two warp layers of each shed in one direction initiates formation of the selvedge for each fabric. On the next pick the crossover effect is reversed because a thrust is applied to the other lateral projection of the arm 15.

FIG. 4 shows how the clearance in the slot 6 allows the arm 15 to tilt, so that the yarn guides 34 of the long bars 28 and the yarn guides 35 of the short bars 25 of frame B have crossed over and passed beyond the yarn guides 36 of the short bars 20 and the yarn guides 37 of the long bars 19 of the frame A, with the result that the crossing over of the warp yarns of the two warp layers of each shed in the opposite direction in respect of the previous pick have completed formation of the two selvedges.

FIG. 5 is a view in side elevation which corresponds to FIGS. 3 and 4 and which gives some idea of the formation of the two sheds C, D formed as a result of the movement in one direction as in FIG. 3 and the movement in the opposite direction as in FIG. 4, the wefts 38, 39 being received in the sheds.

With reference to FIG. 6, the perspective view of the device corresponds to the view in side elevation of FIG. 5, the two frames A and B being illustrated in the position shown in plan view in FIG. 4. The device is secured by means of the lug 1 and the screw 2 to a stationary support arm 40 of the loom frame 41. The different elements of the device which are visible in FIG. 6 are designated with the same reference numerals as in FIG. 1 to 5. At 42 and 43, there are illustrated frame portions of the loom healds, each of which is provided with an upwardly extending projection 44 and 45, respectively, adapted to act, alternately, during their reciprocating movement on the stationary guides 43 and 49, on the lateral projections 16 and 17 of the arm 15 carrying the frame A, and on the cross beam 33 connected through the rod 24 to the frame B. As shown in FIG. 6, the projection 44 pushes the lateral projection 17, and the projection 45 pushes the cross beam 33 in the sense of the arrows shown in FIG. 4. The reciprocating movement of the frame portions 42 and 43 of the loom hcalds is caused in any conventional manner in unison with the picking movement of the loom reed and the loom slay 51. As the said frame portions 42 and 43 of the healds act on the frames A and B through their upwardly extending projections 44 and 45, the lateral projections 16 and 17 of the arm 15 carrying the frame A, and the cross beam 33 connected through the rod 24 to the frame B, these frames are also operated in unison with the reciprocating movement of the healds. At 46 and 47, there are illustrated fragmentary parts of the two parallel fabrics produced simultaneously.

What I claim is:

1. A selvage forming device for looms producing two fabrics simultaneously and provided with two warp layers to form two sheds comprising a first frame and a second frame mounted on the loom frame and being operative to form two selvages simultaneously in the two fabrics, the frames being disposed in parallel relationship for reciprocating movements between an operating position and a return position, the first of said frames being adapted to move towards and away from the planes of the warp yarns, the second frame being adapted to move towards and away from the planes of the warp yarns while shifting alternately laterally on each movement towards said warp yarns, the two frames each comprising a plurality of alternately arranged long and short bars forming a grid like system, said bars being connected at one end to a base of the corresponding frame and forming at the other end yarn guides through which the warp selvage yarns extend.

2. The selvage forming device as claimed in claim 1 comprising members supporting said frames on the loom, guide rods arranged slidably in said support members for movement of the frames into their operating position, springs connected to each frame to produce movement of the frames into the return position simultaneously with the lateral reciprocating displacements of the second of said frames, in order that as said frames move towards one another with their corresponding bars and with the resulting slight lateral shift of said second frame, the Warp selvage yarns of each shed cross at each shed formation.

3. The selvage forming device as claimed in claim 1 wherein the length of said alternately arranged long and short bars differs at the center of the yarn guides by a length corresponding to the distance between the two layers forming the two warp sheds, the longer bars of the first frame cooperating with the shorter bars of the second frame to form one selvage shed while the shorter bars of the first frame cooperate with the longer bars of the second frame to form a second selvage shed.

References Cited UNITED STATES PATENTS 438,781 10/1890 Simpson 139--54 1,272,532 7/1918 Robison et al. 139-20 1,872,935 8/1832 Gordon 139-54 FOREIGN PATENTS 97,989 3/ 1897 Germany.

10 HENRY S. IAUDON, Primary Examiner.

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