FR2478683A1 - PINCES TYPE WEAVING - Google Patents

Abstract

The invention relates to a weaving loom of the pliers type. AN OSCILLATING BODY 7 ALLOWS TO COMMUNICATE OSCILLATORY MOVEMENTS TO TWO FLEXIBLE RIBBONS SUPERIMPOSED 3, 3 THROUGH CIRCULAR GUIDES 2 AND STRAIGHT 5, 5 AT THE FREE ENDS OF THE RIBBONS 3, 3 ARE FIXED CROSS-GOING CLAMPS 6, 6 RESPECTIVELY TWO OPEN CROWDS, SHAPED IN SUPERIMPOSITION BY CHAIN THREADS, SO AS TO GET TWO WEFT THREADS ON THE GO, AND INSERT THEM IN THE TWO CROWDS ON RETURN. THE INVENTION ALLOWS SIMULTANEOUS MANUFACTURING OF TWO FABRICS, OVERLAPPED.

Description

1. The invention relates to a loom,

  more particularly of the clamp type.

  There is already known, and widely used, a gripper-type weaving machine, with which textile fabrics are woven by inserting weft threads into a shed by means of two heads.

  tongs, designed to each perform a movement

  back and forth under the action of a ribbon of

  flexible portion, fixed at one end to a drive wheel, which can itself be driven oscillatingly, a gripper head being attached to the other end of the flexible insertion strip,

  to insert weft threads into a crowd.

  When weaving a textile fabric, the threads of

  are arranged in the form of a large

  on the side of the loom, and they are brought to a first gripper head, which grabs the weft thread out of the shed and carries it through the first half of the shed to the middle thereof, o he is transferred to one. second gripper head which, in turn, introduces the weft yarn, coming from the middle of the shed, through the second half of the shed, and releases the weft yarn as soon as

that he came out of the crowd.

  However, with such a known gripper loom, such as the speed of rotation of the

  drive wheel is limited to a certain amount

  theirs by the drive mechanism of the ribbon of

  flexible production of textile fabrics.

  the is naturally limited; in addition, as the weft thread may not be transferred between the first and second gripper heads, in the middle of the crowd, the quality of the fabrics may be

  altered when this occurs during weaving.

  The invention makes it possible to produce a gripper-type weaving machine whose productivity in

  textile fabrics is remarkably increased in comparison

  parison of that of a traditional craft, of the type

defined above.

  Another object of the invention is to

  a pliers-type loom in which the absence of transfer of a weft thread during weaving is completely eliminated or reduced to

a minimum.

  Another object of the invention is to

  a pliers-type loom that allows

  to weave simultaneously two kinds of textile fabrics

tiles.

  Another object of the invention is to

  a gripper-type loom, which allows

  makes it possible to use a very wide variety of weft threads, such as gold or silver threads, fiberglass threads, etc., that it is very difficult,

  if not impossible, to weave with a traditional craft

that of this kind.

  The gripper type loom according to

  the invention comprises two super-clamp gripper heads

  designed to be inserted simultaneously, by means of flexible insertion tapes, into two superposed crowds which are simultaneously formed

  starting from two groups of weft yarns

  yen a comb and two smooth, in the usual way

  if that. In a preferred embodiment of the invention, the insertion of the weft threads into the corresponding crowds takes place in such a way that the weft threads, which are each arranged, outside the crowds, in the form of a large reserve, on the side of the machine opposite to the side by which the gripper heads are sent, are grasped by the corresponding gripper heads at the ends of the machine.

  their course in a sense, that they are then trans-

  carried separately through the entire length of the crowds, outwardly of said crowds, near the side by which the gripper heads are sent,

  while the gripper heads move in the

  sense, and that they are finally released, at this

  place, by the corresponding clamp heads.

  According to another characteristic of the invention, the flexible tapes used for the insertion

  frames are superimposed in

  respective interior portions of ribbed, arcuate guide elements which are arranged in a vertical plane of

  in a circle, one of the

  mites of each ribbon being attached to the periphery

  of a ribbons driving wheel, or to an ex-

  tremity of a drive lever, so that the center of the drive wheel ribbons, or else

  the other end of the drive lever is

  attached to an axis arranged to be driven so as to oscillate around the center of the circle on the periphery

  of which the guide ribbon elements are arranged

  while the other ends of the ribbons

  flexible, having passed through guiding

  straight ribbons arranged horizontally in the direction of movement of said flexible ribbons,

  are securely fastened to the corresponding gripper heads

  dantes, rectilinear ribbons guide elements being arranged so that said gripper heads release the weft son at the end of their return stroke. By the foregoing, we understand that, as

  the loom according to the invention makes it possible to weave simul-

  two textile fabrics, identical or different,

  rents, one can easily obtain a productivity almost double that of a loom

  clamp type, provided that the

  flexible tapes are practically the same

  than in the case of a traditional craft of the type to

  pliers. In other words, one can manufacture

  Twice as much fabric as with the conventional rapier type loom, using the same installation surface, and fabrics can be woven using almost half the electricity per unit area. of cloth, than with a conventional claw type craft. In addition, the

  according to the invention has a relative constitution

  easy way, thanks to which its adjustment is

  and the probability of failure is reduced. An advantage of the invention according to the invention is that the noise generated during operation is reduced; a measurement showed that the noise produced is almost two

  less than that of a traditional craft. In-

  with the loom according to the invention, as the weft threads are gripped by the gripper heads outside

  crowds, and that they are transferred, through

  the length of the crowds to the opposite side of them, unlike a trade

  such a classic, where the weft is transferred

  d from one to another clamp heads in the middle

  of the crowd, it can be considered as highly im-

  probably the absence of transfer of the weft thread from one clamp head to the other, which was one of the

  defects of the conventional craft, the clamp type. They-

  follows that the textile fabrics made by the trade

  according to the invention have a superior quality. In-

  because the absence of transfer of

  me by the heads of pliers is excluded, the loom

  ser according to the invention makes it possible to use a wide variety of weft threads, for example gold threads,

  silver, fiberglass, etc., so that.

  various kinds of fabrics can be made

  yen of a single trade according to the invention, and yet with a productivity higher than that of a conventional trade.

  These objects of the invention, as well as

  very, will appear more easily on reading

  the following description with reference to the drawings

  of several forms of implementation of the

  tion only as an example.

  Figure 1 is an elevation view

  of the frame-support of ribbons which is one of the constituent elements of a first mode of execution

of the craft according to the invention.

  Figure 2 is a rear elevational view of

  lateral support of the support frame of flexible ribbons

of Figure 1.

  Figure 3 is a section of the guiding elements

  of rectilinear ribbons along line III-111 of the

figure 2.

  FIG. 4 is a section of a ribbed guide element, arched along the line IV-IV of FIG.

figure 2.

  Figure 5 is a section of the rack and

  its guide along the line V-V of Figure 1.

  Figure 6 is a view similar to that

  Figure 2, but showing a second mode of exe-

  execution of the support frame of flexible ribbons.

  FIG. 7 is a sectional view of an arcuate ribbed guide element along line VII-VII of FIG.

figure 6.

  FIG. 8 is a plan view, at most

  large scale, the clamp head of Figure 2.

  FIG. 9 is a section of the rectilinear ribbon guide element along line IX-IX of FIG.

Figure 8.

  Figure 10 is a schematic view of

  two superimposed crowds, a comb and two

  his, necessary to train the crowds and execute

threshing.

  We will first consider Figures 1, 2

  and 6; a support frame of flexible ribbons, 1,

  the general configuration of an erected panel having a semicircular upper edge and a rectilinear transverse base at its lower end, is provided on one of its vertical surfaces with

  the upper part of a series of guide elements

  ribbons, arcuate, 2, spaced apart substantially on a circle, except for a portion substantially in one of the upper quarters, the arcuate outer surfaces of the ribbons, 2 , disposed substantially on the upper half of the ribbonsupport holder, 1, preferably being arranged to reach the level

  the semi-circular upper edge of the said support structure

  Ribbons 1. In the embodiment of FIG. 6, each of the ribbon guide members, arcuate, 2, has a U-shaped section, which opens inwards, the interior width of which corresponds to the width.

  a flexible ribbon, $ 3

  corresponds to twice the thickness of a ribbon 3, as shown in FIG. 7, whereas, in the embodiment shown in FIG. 2, each of the ribbon-guide elements, arched, 2, has a section of

  rectangular shape, one of the big sides, that is

  that is, one of the inner sides being split lengthwise

  tudinally in the middle and having a width

  which corresponds to the width of the flexible ribbon

  ble, 3, and a depth that corresponds to twice

  the thickness of a ribbon 3, as shown in FIG.

  4. In the first case, the guide-ru-

  bans, arcuate, 2, are attached to the support frame of

  so that their open side is directed towards the in-

  as shown in Figure 6. In the

  xth case, the guide-ribbon elements, arcuate, 2, are

  attached to the support frame 1 so that their parts

  slit is directed inwards, as shown in Figure 2.

  As shown in Figures 1 and 6, coaxial

  at the center of the circular series of guide ribbon elements, arcuate, 2 is rotatably disposed a driving wheel 8,

  diameter almost corresponds to the inner circumference

  of the guide-ribbon elements, 2, the wheel of

  8 is fixed on a shaft 10, rotatably mounted in the support frame 1, and carrying a pinion 11, fixed on its part which de-

  passes the outer surface of the support frame 1, oppo-

  where the guide elements are arranged

  ribbons, 2. With the pinion It meshes a rack

  13, which, as shown in Figure 5, is supported by

  vertically inside a rectangular support

  12, so as to be able to move relatively

  with the latter, the support 12 being fixed vertically

  at the outer face of the support frame 1. A

  main shaft 14 suitably disposed horizontally

  in the lower region of the support frame 1, carries a crank arm 15> which is fixed at its front end, and a rod 16, hinged by

  one end at the free end of the arm of

  15, is articulated by its other end to

  the lower end of the rack 13,

  that said rack 13 is connected functionally

  to the main shaft 14. Thus, conventionally, when the main shaft 14 is driven

  in a continuous manner, the rack 13 performs a

  back and forth, through the crank arm 15 and the connecting rod 16, so that the tape drive wheel 8 makes a pivotal movement of a predetermined angle, in one direction or the other, through

  at the meshing of the pinion 11 with the rack 13.

  As shown in Figure 6, two flexible ribbons

  3,3, each having a predetermined length, are

  produced in the interior space of the guide elements

  ribbons, arched, 2, so as to overlap, and at this

  inside the elements 2, their faces

  are arranged around the outer periphery of the drive wheel of the ribbons 8, a space being provided between them. In the embodiment of FIG. 6, the ribbons 3, 3 are arranged independently of the ribbons of the outer periphery of the drive wheel / 8, so that one of their ends is fixed around the circumference of the wheel. ribbons, 8, while their remaining parts surround the rim

  wheel 8 in the opposite direction of the hands of a

  be, and move away tangentially from the wheel of

  8 of the ribbons at its upper part,

  shown in Figure 6, after which the flexible ribbons

  3, 3 are guided separately in a substantially horizontal direction. In a similar way to the embodiment shown in FIG. 2, and explained

  further, near the tape support frame 1 is dis-

  placed in the direction where the flexible tapes 3, 3 move away from the tape drive wheel 8, a vertical support, 26, parallel to the tape support unit 1, and designed to support two guide-ribbon elements, straight, - 55, that is to say that they are fixed to the vertical support 26, to its

  upper extremity, so as to be arranged

  one on top of the other, and practicing

  parallel to a plane tangent to the top of the drive wheel of the ribbons 8, in the direction where the flexible ribbons 3, 3 move away from the wheel

  Training Ribbons-8. As shown by the

  3, each of the rectilinear ribbons, has a substantially rectangular hollow section, its inner width substantially corresponding to that of the flexible ribbon 3, and its inner height corresponding substantially to the thickness of a ribbon

  3, a longitudinal slot being formed in its middle

  place and open upward, the ribbon guide element further having a predetermined length.

  We will now explain more fully

  the method for mounting the flexible strips 3 on the rectilinear guide elements, 5, 5 and

  the driving wheel of the ribbons 8. After in-

  troduces one end of each of the flexible strips 3, 3 into the interior space of the respective rectilinear guide elements 5, 5 by their

  open ends opposite the driving wheel.

  ribbons 8, we introduce the ribbons together

  flexible 3, 3 in the respective spaces of the ele-

  2, arranged in a circle on one of the sides of the tape support frame, 1, so that the front ends of the ribbons 3, 3 engage simultaneously simultaneously in the space of the tape guide element, 2, which is at the very top of the support frame 1, and then in the space of the adjacent element 2, and so on. Finally, the front ends of the flexible strips 3.3,

  after leaving the space of the last of the

  2 (which is sufficiently spaced from the first not to hinder the movement of the flexible strips 3, 3 when they extend substantially horizontally out of the space of the guide element 2 at the very top or for enter it)

  are firmly attached to the edge of the drive wheel.

  ribbons 8, by any appropriate means, such as

  indicated above. In this case, the length of each

  each of the flexible ribbons 3 is chosen in practice such that, when its front edge attached to the edge of the drive wheel of the ribbons 8, is in one of the extreme positions of the wheel 8, where it is surrounded , practically all around, by the flexible ribbons 3,3, as

  shown in Figure 6, its other end is

  near the end of the tape guide element

  tiligne, 5, opposite to the training wheel of the

bans 8.

  The other end of each of the ribbons 3

  is provided with a gripper head, 6, which, like the

  FIGS. 8 and 9 comprise a clamp body

  plate-shaped, 30, rigidly connected, by its former

  posterior tremity, at the terminal part, free,

  flexible tape 3, in the longitudinal direction

  of it, and going a little beyond the surface of

  the ribbing guide element, rectilinear, 5, its width being a little smaller than that of the ribbon

  flexible 3, a hook 20 formed at the anterior end

  upper part of the clamp body 30 so as to form a

  opening 19 turned backwards, a lever

  be 17, having a fulcrum close to its ter-

  anterior mineral, on the underside of the body

  clamp 30, so that its anterior marginal portion

  co-operates with the inner marginal

  of the hook 20, to define the opening 19, of

  to enclose a weft thread between them when

  said anterior marginal portion of the lever

  be 17 is thrust in abutment against the inner edge

  hook 20, while the posterior end portion

  the said curved lever 17 is designed to make contact, by its outer marginal part, with the front end of one of the upper flanges,

  21, defining the upper wall of the space

  interior of the rectilinear ribbons guide element 5, as seen especially in FIG. 9; a spring

  with a blade 18 is fixed rigidly by its end pos-

  at the bottom surface of the clamp body 30

  so that the anterior terminal part of the res-

  Fate 18 abuts against the curved lever 17, at its inner marginal portion, near its portion mounted on the clamp body 30, but in an area opposite the front end portion of the lever 17, relative to the pivot. it is thus understood that the inner and anterior marginal portion of the curved lever 17 is usually thrust in abutment against

  the inner marginal part of the hook 20 by the

  tion of the leaf spring 18, which always tends to rotate the curved lever 17 counterclockwise about its fulcrum on the clamp body 30, as seen in FIG. 8, as long as the gripper head 6 is spaced apart from the rectilinear tape guide element 5; however, when the gripper body 30 is pulled towards the rectilinear tape guide member 5 by rotation of the tape drive wheel 8 clockwise relative to FIG. 6, and that the outer and rear marginal portion of the curved lever 17 comes into contact with the inner terminal angle of the upper flange,

  21, of the ribbons guide element, rectilinear, 5, the

  Curve 17 is forced to rotate clockwise with respect to FIG.

  against the force of the leaf spring 18, which suppresses

  me the stop between the inner marginal part

  and front of the curved lever 17 and the mar-

  Inner and anterior ginale 20

clamp body 30.

  Figure 2 shows another mode of execution.

  invention; instead of the training wheel

  ribbons, 8, which is shown in the figure

  6, a drive lever, 7, is used to

  horizontally drag the flexible strips 3, 3, in oscillations, at the same time as the gripper heads 6, 6 fixed at their free ends. In the embodiment shown in FIG. 2, the rear end of each of the flexible strips 3, 3 is connected to the free end of the driving lever.

  7, which is fixedly mounted on a shaft 10, itself

  rotatably carried in the center of the portion of the tape support frame, 1, as in the embodiment of FIG. 6. In this case also, several tape guide members, arcuate, 2, are

  arranged in a circle on one of the surfaces of the building

  tape support, 1, so that some of them are arranged around the upper peripheral portion of the tape support frame, 1, each of the 1.2 guide members 2 having, as shown

* Figure 4, a rectangular general configuration

  hollow section and having a width-and

  an interior height which generally corresponds

  the width and twice the thickness of each flexible ribbon 3, as indicated above. In addition, the ribbons guide element, arched, 2, presents,

  in the center of its inner wall, a long groove

  for the free passage of the ter-

  1.0 minal, free, of the training lever 7, where the

  ends of the flexible ribbons 3 are fastened together

  when the training lever is turned

  7, the driving of said lever 7 taking place

  through a mechanism similar to this

  1.5 him from the embodiment shown in FIGS.

6 and 7.

  With regard to the essential parts

  allowing them to perform weaving, like

  10 schematically, they comprise two superimposed shuttle paths (not shown),

  each being arranged horizontally and practically

  aligned with the straight guide-ribbon elements

  5, 5 so that the gripper heads 6, 6 can

  wind regularly on the turnip roads-

  corresponding to you when the heads of pliers 6, 6 are

  back-and-forth as a result of

  flexible tapes 3, due to the oscillating movement of the tape drive wheel, 8,

  or the training lever, 7. In addition, a

  24 and two smooth 25, 25 are also arranged to be operated synchronously to form two crowds, 9, 9, superimposed, starting from two groups of warp son, 40,40 'in the conventional manner, well known; the gripper heads 6, 6 are

  designed to fit respectively into the

  the 9, 9, simultaneously. Since the process

  above weaving and the mechanism for this purpose

  are similar to those of the traditional occupations of this

  species, apart from the formation of two super-crowds

  asked 9, 9, it seems superfluous to describe them in detail. We will describe below the operation

  of the device according to the invention, which is

  different from that of traditional

this genre.

  When turning the drive wheel

  8, or the drive lever 7,

  counter clockwise relative to

  Figure 6 or 2, starting from the

  presented, using the main tree'14 and by

  through the crank arm 15, the biel-

  16, the rack 13, the pinion II and the armature

  10, the flexible ribbons 3, 3, as well as the

  6, 6, placed at their free ends, are successively expelled from the inner spaces of the guide-ribbon elements, arcuate, 2, and the gripper heads 6, 6 are respectively forced to leave the end portions of the guide-ribbon elements. ,

  rectilinear lines, 5, 5, which are opposed to the wheel of

  ribbons, 8, or the training lever

  7, to fit simultaneously and separately in the crowds 9, 9; at the end of their journeys through the corresponding crowds 9, 9, the heads

  pliers 6, 6, seize corresponding weft threads

  pigs arranged outside the crowds 9, 9, opposite the drive wheel of the ribbons, 8, or the driving lever, 7, by means of the hook

  and the inner and anterior part of the

  curve 17 and the gripper body 30, thanks to the

  In this case, as the weft threads can be transferred from the large reserves corresponding to the gripper heads 6, 6,

  by any appropriate means, well known in this gen-

  It is not necessary to describe completely here how the weft threads are gripped by the gripper heads 6, 6.

  that the weft threads are thus seized by the heads

  clamps 6, 6, the drive wheel is rotated.

  8, or the drive lever 7, in the opposite direction, thus in a clockwise direction, to bring the flexible ribbon 3 inside the spaces of the successive guide ribbon elements 2, so that the gripper heads 6, 6 are removed respectively through the crowds

  9, 9 to insert the corresponding weft threads.

  Thus, once the gripper heads 6, 6 have been returned to their initial positions, the rotation of the drive wheel of the ribbons, 8, or the lever

  of training, 7, stops, and, at the same time, thanks

  this at the abutment between the outer and rear marginal portion of the curved levers 17 of the gripping heads 6, 6, and the anterior end of the flanges 21 of the guide-ribbon elements, rectilinear, 5, 5, the

  curved levers 17 are released from any cooperative

  with the previous marginal parties and

  the hooks 20 of the clamp body 30,

  the force of the leaf springs, 18, so that the weft threads are released from the gripper heads

  6, 6, and the insertion of the frames is complete.

  It is therefore understood that, by repetition of the above operating cycle, two textile fabrics can be woven simultaneously by means of a

  only one job, so that they are super-

posed.

  In the description above, we have

  explained in detail the modes of execution of the invention

  as examples, but many variations can be made by those skilled in the art without

depart from the scope of the invention.

3.5

Claims (3)

R E V E N D I C A T I 0 N S   1. A weaving machine of the pliers type,   characterized by the fact that it includes two ribbons   flexibles arranged to be trained simultaneously   in an oscillating motion, means for forming two overlapping crowds from two groups of warp yarns, in synchronism with the oscillatory movement of the flexible ribbons, and   clamp heads attached respectively to the ends   flexible ribbons, so that they can be   wind seize weft threads on an outer side   crowds when said gripper heads are formed   to cross the corresponding crowds thanks to the oscillatory movement of flexible ribbons in   meaning, and that said gripper heads can   the weft threads into the corresponding crowds   when moving to the other side   outside the crowds, thanks to the oscillating movement   flexible ribbons in the other direction, from which it follows that the weft yarns are then released from the   corresponding gripper heads and that a cycle of   we are finished with the weft threads.   2. Loom according to claim 1, characterized in that the flexible tapes are housed in the respective interior spaces of a series of guide elements-ribbons, arcuate, which are arranged in a circle in a vertical plane, and that one end of each of the flexible ribbons is attached to the edge of a ribbon drive wheel,   or at the free end of a training lever   in such a way that it can be turned   the inner circle of this circle, coaxially with it, and that, after the flexible ribbons have respectively crossed the interior spaces of rectilinear guide ribbon elements arranged in superposition opposite said circle in the direction of exit of the ribbons, the other ends of said ribbons are   fixed respectively to the gripper heads.   3. Loom according to claim   2, characterized in that each pin head   it comprises a substantially band-shaped gripper body and arranged to be connected by its end.   posterior to the end of the flexible ribbon cor-   respondent, a hook formed in the earlier part   of said clamp body and having a   rearward facing, a curved lever having a fulcrum on the clamp body, and   an earlier marginal part arranged to   against the inner marginal part of the   opening, and a posterior terminal   arranged to abut against the terminal part of   the ribbons guide element, rectilinear, and   a leaf spring rigidly connected by one end   mated to the clamp body, so that its other ex-   tremity always asks for the terminal part   the curved lever towards the marginal   interior of said opening.