EP0442024A1 - Nouveau système d'introduction du fil de trame dans un métier à tisser et son entrelacement par formation de foules variables - Google Patents

Nouveau système d'introduction du fil de trame dans un métier à tisser et son entrelacement par formation de foules variables Download PDF

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Publication number
EP0442024A1
EP0442024A1 EP90111349A EP90111349A EP0442024A1 EP 0442024 A1 EP0442024 A1 EP 0442024A1 EP 90111349 A EP90111349 A EP 90111349A EP 90111349 A EP90111349 A EP 90111349A EP 0442024 A1 EP0442024 A1 EP 0442024A1
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EP
European Patent Office
Prior art keywords
weft
interlacing
inclusion
sheds
entry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90111349A
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German (de)
English (en)
Inventor
Jaime Tuset Rovira
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0442024A1 publication Critical patent/EP0442024A1/fr
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
    • D03D41/005—Linear-shed multiphase looms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C13/00—Shedding mechanisms not otherwise provided for

Definitions

  • the present Patent of Invention relates to a new system of entry and inclusion of the weft thread in a weaving machine and its interlacing by the formation of sheds of variable plane.
  • the current looms and weaving machines are based on the following systems: weft pullers, nippers with transfer, projectile, air nozzles, water nozzles, two-phase, flat undulating sheds, and circular machines.
  • weft threads are subjected to high tensions, which increase with the speed of insertion.
  • the loom with shed of variable plane of the present invention is a machine of new design whose basic elements are its simplicity, absence of enormously heavy and rigid masses in intermittent motion, on the contrary, its operation is rotatory and continuous.
  • the loom with shed of variable plane does not insert wefts transversely, and therefore it eliminates the intermittence of the introduction of these threads, and therefore also eliminates the intermittence of the batten.
  • the weft is introduced from the rear forward and enters simultaneously over its entire width.
  • the width therefore, is not a limitation of the speed of weft insertion.
  • the loom may have any desired width; the time of weft insertion is always the same; in practice the loom will have several times the width of a conventional one.
  • the batten is of a different design; it is a cylinder with numerous cams, it acts in a rotatory manner and continuously compresses the approaching wefts, and when they reach its sphere of action they are displaced and compressed toward the weaving line.
  • weft threads will simply be tensioned, disposed in weft-holding devices located behind the interlacing mechanisms, and therefore subjected to insignificant tensions.
  • the interlacing devices which at the same time constitute the shed, will have an approximate length of 5 mm, and therefore the friction zone will be this only, and there will be contact once and for a very short time, for the warp as well as for the weft threads; the defibering that may occur will be very little and the detachment of dust from the sizing materials also very limited.
  • the wefts have a very limited number of colors; in the system of the shed of variable plane there may be up to 400, as many different colors as there are grooves in the weft-holding device; this gives it color combination options not attainable with the conventional systems.
  • the speed of the machine is estimated at a minimum of 1500 insertions per minute; to this must be added that as the introduction is simultaneous over the entire width, the output will be determined by the width of each machine.
  • the new system of entry and inclusion of the weft thread in the weaving machine of the present invention consists of a main shaft (1), provided at its ends with a flywheel (2) of six arms. Each of them serves as support for a weft-holding cylinder (3).
  • this cylinder On its envelope or outer surface this cylinder has fluted strips whose purpose is to accommodate the weft threads, to which end there are holes for the passage of the outside air on the bottom of the grooves.
  • the shaft of this cylinder (3) is also hollow and perforated.
  • a distributor (8) At one end of shaft (1) is a distributor (8), provided with joints connected by flexible tubes to the weft-holding cylinders.
  • a vacuum pump (9) creates a vacuum in said distributor (8) and exhausts through the holes in the outer surface of the weft-holding cylinder, thus keeping the weft threads adhering to said surface.
  • the assembly of the main shaft, flywheel and weft-holding cylinders rotates about said axis, and also each cylinder rotates about its axis.
  • the necessary auxiliary mechanism, bearings (4), (5) and (6), supports (7) and drives are provided.
  • the weft transporting mechanism consists of fastening rings (10), concentric with the weft-holding cylinder (3), which takes and fastens one end of the weft threads.
  • the drive wheel (15) and the guide wheels (16) on bearings (12) facilitate the shifting.
  • the reduction gear is mounted on a carriage (13) which in turn supports the guide wheels.
  • the actuation of this reduction gear is obtained by means of current connector rollers (18).
  • the entire assembly is fireproofed.
  • a stop mechanism at end of stroke actuates the trigger (11) which by an angular displacement moves one of the two fastening rings (10) relative to the other, to release the weft threads.
  • the weft fastening and cutting mechanism is mounted at the front end of the weft-holding cylinder (3) and on the cylinder head (19), by means of a sleeve (20) with cap (76) which serves as support for a knife-holding disk (23), counter-knife (21) and knife (22) with sharp teeth at their periphery, and which, acting like scissors, produces the cutting of the wefts.
  • the assembly operates in the following steps:
  • actuators On the arm of the support (26) are situated two actuators, one (27) which at the proper moment actuates and angularly displaces the knife relative to the counter-knife, producing the cut, and actuator (75) which similarly to (27) actuates and displaces the clamping disks.
  • the washers (24) and the retention ring (28) maintain said knife, counter-knife and clamping disks at the end piece of the cylinder shaft (25).
  • Thread guide (50) formed by a cylindrical tube (30) provided with a fixed axle (29), relative to which it can rotate, which action is favored by a series of ball bearings (31) and (35), provided for this purpose.
  • the separating rings (32) and covers (33) complete the mechanism.
  • a support made up of a body (37) and a foot (41) comprises an axle (36), and serves as support for the axle of the thread-guide (29); the spring (38), which can receive an initial tension by means of the sleeve (39) and the threaded sleeve (40), acts as shock absorber, so that properly adjusted it forms part of the warp tension regulating mechanism.
  • the warp is in contact with the thread guide (50), which like the support (37) have been described before.
  • the thread-guide assembly and supports transmit the tension variations of the warp threads to the actual regulator, by means of the angle lever (47).
  • This entire assembly constitutes the warp tension regulating mechanism.
  • the warp tension regulating device has been described above, for which a system has been devised, the regulating device may be any other of those found on the market, but it would substantially reduce the operating time of the machine in question, due to the number of stoppages that would have to be made when changing lower and upper beams so that the efficiency of the machine would be substantially reduced.
  • the creel must not be of conventional type in view of the volume they occupy, but of a new design as in an existing experimental prototype, where, if the threads so require, they can also be sized and dried at the exit from the creel and while the weaving machine is in operation.
  • a reduction gear (45), of constant speed, acts directly on the speed variator which by means of its belt transmits movement to the beam.
  • the weft-holding cylinder (3) rotates on its hollow and perforated shaft (53) to exhaust and evacuate the interior of the cylinder, the effect indicated in figure 1 being obtained.
  • an end piece (54) is disposed, through which, when appropriate, compressed air is introduced.
  • This air passes through the nozzle (55) to a collector (56) also provided with outlet orifices, whence the air is conducted to the outside traversing the holes in the cylinder (3), thus detaching the weft threads.
  • the collector (56) is arranged as indicated in the detail of Sheet #6, so that it always remains in the same position, without rotating, on the shaft (53) . This is so owing to the action of the counterweight (57), compensated with a spring (58).
  • the counterweight and spring are secured to a support (59) which permits rotating the shaft (53) by means of the ball bearings (60).
  • Weft inclusion system The weft having been detached, its transport occurs by air jet; for this there are duly oriented dispersers (66) and (67) which convey the unwound weft (70) bertweem the warps (68) and (69), and the interlacing mechanisms (74), up to the batten disk (52) which compresses them in the fabric, thus carrying out the inclusion of the weft over its entire width and all at once.
  • the mechanism of connection of the weft-holding cylinders permits weaving in variable widths, which can be several times greater than the current maximum widths; to avoid deformations due to the length and weight thereof that would occur, they are limited by means of intermediate supports, hence the need for the mechanism of connection of the weft-holding cylinders illustrated in Sheet #8.
  • joining of the weft-holding cylinders (3) is done by means of their common shaft (53).
  • Said shaft is interrupted and mounted on a coupling sleeve (61) which permits passage of the vacuum flow and at the same time also lets pass compressed air from the air chamber (64) circulating through the air passages (63).
  • On shaft (53) are mounted several ball bearings (65) which facilitate the rotation of the shaft.
  • the interlacing of the warp and weft threads is done with an assembly of interlacing mechanisms by which the fabric is formed.
  • the interlacing mechanism consists of a series of identical cylinders as can be seen in figures 9-2 and 9-3.
  • Each cylinder is formed by two equal suitably assembled parts, the development of which is shown in figure 9-1.
  • Each warp thread is passed according to the path shown schematically in figure 9-1, and of variable thickness -e-, in accordance with the titer and type of yarn to be worked.
  • the cylinder constituted by the assembly of the two above described pieces, of outside diameter ⁇ e, figure 9-2, will rotate in both directions a number of degrees suitable for the weave being made, while the weft thread will move between the two flat parts of the guide cylinder, and meanwhile the two assembled pieces will rotate bringing their respective grooves into coincidence with the horizontal through which the weft passes up to the opposite end where it will come out, thus permitting the passage of the weft in perfect horizontal position.
  • This two-piece cylinder will be provided with a toothed rim on its surface in the manner of a toothed cylinder, whose pitch -g- and tooth height -f- will be suitable for the outside diameter ⁇ e of the cylinder, as the latter can vary according to titer and material to be worked.
  • threads For cloth to be made, threads must be interlaced with picks. Each warp thread is conducted by each of the interlacing mechanisms, one thread per mechanism.
  • the weft thread is supplied from the weft inclusion system, figure 7, and it is forced to follow the path marked in figures 9-2 and 9-3, along the axis X-X, so that it traverses the entire length L in horizontal position.
  • the two-piece cylinder rotates to the right and then to the left, or vice versa, a certain number of degrees, thus permitting that the grooves existing between the two assembled pieces are, by means of these rotations, in perfect synchronism with the groove of the central axis X-X, so that the weft can move through the interlacing mechanism and simultaneously the crossing of the warp threads takes place, so that the thread of the upper part of the interlacing mechanism passes to the lower part, and the second thread which is in the second interlacing mechanism in the lower part passes to the upper part, whereby the position of the warp threads will have changed, a crossing thereof taking place, whereby the first crossing of the weft thread has occurred, whereby the first pick is crossed in front.
  • the first mechanism which carries the warp thread in the upper part descends, and simultaneously the second mechanism, the one which carries the second warp thread and is present in the lower part, ascends, whereby a new crossing occurs, this time in the posterior part of the first pick.
  • the shed has two phases; in the first it occurs by rotations of the interlacing mechanisms, and in the second by means of the up and down movement of the interlacing mechanisms, and therefore it constitutes a shed of variable plane.
  • the mechanism of figure 10 is the one which produces the rotations, the separation, and the approximation of the cylinders or cylinder assemblies which constitute the interlacing mechanism or mechanisms, which bring about and govern the formation of the two stages of the shed, called because of this special characteristic, shed of variable plane, to distinguish it from the conventional looms or weaving machines whose shed takes place as some heddles go up and others go down but the threads always move in a single vertical plane.
  • This mechanism is formed by two worm type screws (75), provided with double grooving (two threads running in opposite direction to each other), so as to produce, continuously and without interruptions, rotations in one direction and then in the opposite direction, of the toothed rims (76) which in this manner will rotate a certain number of degrees, in order to place the groove thereof in horizontal line and coincident at all times with the horizontal shaft divided into two parts (77), in a manner synchronized and coincident with the passage of the weft, so that the weft passes always following a horizontal path, and simultaneously the toothed rims permit the passage of the weft through their grooves causing the warp threads to change position, in order thus to permit the change of place of the warp threads, whereby the crossing of these threads is obtained; the one which initially was in high position now occupies the low position and vice versa.
  • the upper part of the support axles (77) of the rims are joined to the box (78) which supports the assembly with the upper worm, by means of a supporting tie-rod (86), while the lower part of the support axles of the rims are joined to the box which supports the assembly of the lower worm, by means of another supporting tie-rod (86).
  • the actuation of the worm screws will be produced by the eccentric (79) in its rotational movement.
  • This eccentric will have its inner perimeters toothed, having two, four or more cams whose height will be a function of the opening of the shed, that is, of the separation between toothed rims (80); the worm screws return to the neutral position, and in order that their thread will not come in contact with the toothed rims supported by the opposite worms, the thread will be omitted, so that they alone will drive the toothed rims a certain number of degrees in one direction and then the same number (of degrees ) in the opposite direction.
  • the toothed eccentric (79) is integral with the shaft (82), from which it receives movement, and the same eccentric (79) also serves to separate and approach the worms and the toothed rims (77) joined to them, so that they separate from the neutral line, leaving enough space for a second pick to pass between the odd and even rim assemblies.
  • the shed opens, the pick passes, and a return to the neutral position occurs, that is, the shed closes, whereby the second phase of the shed takes place; this justifies the name of shed of variable plane; rotations are carried out in one and then in the opposite direction and, after opening, passage of the second pick and closing.
  • the eccentric (83) moves the wheel (84) which turns simply due to the profile of the eccentric, as there are no toothed grooves in this case, since the only thing that matters is to raise and lower the assembly of cylinders of worms; this occurs by means of the tie-rod (85), which raises and lowers them as a function of the displacement of the cams of the eccentric (83).
  • the toothed wheels (81) will continue to rotate and with them the worms (75), first in one and then in the opposite direction, then the screws will approach and stay as needed for the passage of a new pick, that is, as in the initial position.
  • the mechanism of figure 10 is one of the possible existing mechanisms for producing the movement of the variable plane shed devices, as for example, replacing the thread or serrations by friction systems or devices or the like, etc.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP90111349A 1990-02-15 1990-06-15 Nouveau système d'introduction du fil de trame dans un métier à tisser et son entrelacement par formation de foules variables Withdrawn EP0442024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9000442 1990-02-15
ES9000442A ES2027094A6 (es) 1990-02-15 1990-02-15 Procedimiento de entrada e inclusion del hilo de trama en una maquina de tejer y su ligado por la formacion de caladas de plano variable.

Publications (1)

Publication Number Publication Date
EP0442024A1 true EP0442024A1 (fr) 1991-08-21

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EP90111349A Withdrawn EP0442024A1 (fr) 1990-02-15 1990-06-15 Nouveau système d'introduction du fil de trame dans un métier à tisser et son entrelacement par formation de foules variables

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EP (1) EP0442024A1 (fr)
ES (1) ES2027094A6 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392489A (en) * 1944-07-26 1946-01-08 Martin Archworth Weaving apparatus
US3636986A (en) * 1969-12-22 1972-01-25 Texaco Inc Open back shed loom
CH543621A (de) * 1972-04-14 1973-10-31 Rueti Ag Maschf Einrichtung zum Bilden von Gewebebindungen
GB2115021A (en) * 1982-02-10 1983-09-01 Ostoja Darko Loom having shed-forming weaving discs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392489A (en) * 1944-07-26 1946-01-08 Martin Archworth Weaving apparatus
US3636986A (en) * 1969-12-22 1972-01-25 Texaco Inc Open back shed loom
CH543621A (de) * 1972-04-14 1973-10-31 Rueti Ag Maschf Einrichtung zum Bilden von Gewebebindungen
GB2115021A (en) * 1982-02-10 1983-09-01 Ostoja Darko Loom having shed-forming weaving discs

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Publication number Publication date
ES2027094A6 (es) 1992-05-16

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