EP0084471A1 - Schnelldrehende schützenlose Webmaschine - Google Patents

Schnelldrehende schützenlose Webmaschine Download PDF

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Publication number
EP0084471A1
EP0084471A1 EP83400026A EP83400026A EP0084471A1 EP 0084471 A1 EP0084471 A1 EP 0084471A1 EP 83400026 A EP83400026 A EP 83400026A EP 83400026 A EP83400026 A EP 83400026A EP 0084471 A1 EP0084471 A1 EP 0084471A1
Authority
EP
European Patent Office
Prior art keywords
crowd
machine
distance
frames
weft
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.)
Granted
Application number
EP83400026A
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English (en)
French (fr)
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EP0084471B1 (de
Inventor
Yves Juillard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alsacienne de Construction de Material Textile
Alsacienne de Constructions Mecaniques SA
Original Assignee
Alsacienne de Construction de Material Textile
Alsacienne de Constructions Mecaniques SA
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Publication date
Application filed by Alsacienne de Construction de Material Textile, Alsacienne de Constructions Mecaniques SA filed Critical Alsacienne de Construction de Material Textile
Publication of EP0084471A1 publication Critical patent/EP0084471A1/de
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Publication of EP0084471B1 publication Critical patent/EP0084471B1/de
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • 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

Definitions

  • the present invention relates to the textile industry and, more particularly, shuttleless weaving machines in which the weft thread is inserted into the shed by means of a weft pass consisting of one or two rigid needles (most often, two needles animated by opposite alternative movements which exchange the thread substantially in the middle of the width), or by a projectile, or by any other device allowing the weft thread to cross the crowd.
  • the invention relates more particularly to weaving machines of large width, weaving at least 140 cm wide.
  • the breaks in the warp yarn come partly from the fatigue of the yarn (alternating elongations, number of elongation cycles undergone by each point of the yarn, wear of the yarns by circulation in the smooth, percussion between the threads of the two layers forming the crowd when the layers cross) and, on the other hand, the impact of a moving organ, for example a weft insertion needle, against a chain when the crowd is badly opened and two wires have remained hooked to each other at the cross (formation of Y).
  • the warp threads are unwound from the beam, pass over a rear thread-carrying roller, then through the heddle eyelets carried by several frames and then through the comb.
  • the weft thread is inserted into the crowd in front of the comb, by the weft needles activated by their drive mechanism, then the weft thread thus deposited is pressed by the comb against the edge of the already formed fabric.
  • the distance a between the facade and the first frame is between 120 and 250 mm, while the total opening angle of the crowd is generally around 25 ° (2 x 12 ° 5) without exceeding 30 ° (2 x 15 °), so as not to impose excessive alternative elongations on the warp threads.
  • the object of the invention is to remedy these drawbacks of conventional weaving machines and to allow them to operate at a much higher rate than hitherto, for example around 400 to 500 strokes / minute, without increasing the average frequency. timetable of stops, this result being obtained, mainly, thanks to a relatively new arrangement of the chain control bodies.
  • the subject of the invention is a shuttleless weaving machine, in which the warp threads unwinding from the beam pass over a rear thread holder, then through the eyelets of the heddles carried by several frames, then through the teeth. of the comb to finally reach the front line where the fabric is formed, said machine being characterized in that the first frame is arranged at a distance a from the front line and at a distance b from the rear thread holder such that the ratio ⁇ is equal to or greater than 10.
  • the abovementioned ratio b is of the order of 12 to 15.
  • this new arrangement makes it possible to use a larger crowd opening angle than in the past, for example between 30 ° and 35 ° (2 x 15 to 2 x 17.5).
  • Figure 1 is not to scale in the horizontal and vertical directions and that only the first frame C 1 and the second frame C 2 have been shown which divide the chain in two layers 20-20 ', while the number of frames is generally much greater.
  • the distance a is that measured between the facade line 14 and the first frame C 1
  • the distance b is that measured between this first frame C 1 and the rear thread holder 6.
  • the depth a + b or a '+ b' of the loom is identical.
  • One of the causes of breakage of a chain wire is the fatigue of the wire caused by the alternating elongations which it undergoes because of the movement of raising and lowering of the frames.
  • E the ratio between the length AB of the wire ( Figure 4) in the middle position (at the crossroads) and the length AC + CB when the crowd is at full opening, it is obvious that E depends on a and report .
  • FIG. 5 shows the variation in the elongation rates at the first frame as a function of the opening angle a of the crowd.
  • Curves 1-2-3 relate to traditional trades with respective ratios of 5, 7 and 9.
  • Curves 4-5-6- 7 relate to trades according to the invention having respectively ratios from 11, 13, 15 and 17.
  • the fatigue rate becomes 0.32, i.e. an 18% reduction despite an appreciable increase in the opening angle of the crowd, an increase which is very favorable, as we will see later, in the case of threads which do not uncross well, but which, in conventional trades cannot be applied since it increases the rate of elongation (see FIG. 4).
  • Another cause of fatigue is the wear caused by the circulation of the wire 20 in the heald eyelet 8-8 'with each movement of the frames C 1 , C 2 ...
  • part of this elongation can be compensated by a lateral flexion of the healds, but if the elongation is significant it is the wire which ends up moving in the heald eyelet and this friction produces wear of the wire, source of breakage.
  • FIG. 6 shows the two plies of warp threads 20-20 ′, the front line 14, the eyelets 8-8 ′ of the heddles carried by the first two frames C 1 -C 2 and the bisector AB of the fcu- le.
  • ADC Y-component angle
  • FIG. 6 represents the formation of a "Y" of maximum angle e on a conventional loom, with normal crowd (for example where a ′ is of the order of 130 mm) and we have represented, at the same scale, in FIG. 7, the formation of a "y" of the same maximum angle ⁇ on a "reduced crowd” loom in accordance with the invention (for example where a is of the order of 65 mm) with opening from the crowd 2a.
  • Y of angle less than 8 can also form, closer to the facade, in the area DA, but these Y are less harmful since they are further from the line where is filed the frame.
  • the frames which are subject to alternating displacements of fairly large amplitude, have fairly large heights, so that to be sufficiently rigid, they always have a thickness of between 10 and 16 mm, the thickness the most common being 12 mm.
  • the thickness of the frames can be reduced without inconvenience.
  • the frames have a thickness e which does not exceed 7 mm.
  • Another cause of fatigue and breakage of the warp threads is the number of alternating cycles of elongation that each point of the thread undergoes, from the moment it leaves the beam to the moment it reaches the front line. To reduce this fatigue, it is therefore desirable to reduce this number of cycles.
  • the distance a is less than 75 mm (an advantageous dimension being 70 mm) and that the ratio - is advantageously 15.
  • the depth a + b of the loom in accordance with the invention would be 1120 mm, a reduction of 25.3%.
  • the number of alternating cycles of elongation undergone by one point of the thread before being woven is reduced in the case indicated above. also 25.3% compared to what happens on a traditional job, which further distances the thread from its critical rate of fatigue and reduces the number of breaks.
  • the depth is chosen between 900 and 1200 mm, so as to obtain the best compromise between the advantages obtained.
  • the opposite reciprocating movement of the two weft-passing needles can be produced by any known mechanism, for example by a conventional mechanism called “diamond", but according to a preferred embodiment, which will be described in About FIG. 11, a so-called “balanced Cardan circle” mechanism is used, such as that described in French patent No. 2,477,586.
  • the large width machine (for example equal to or greater than 1 meter 40) shown diagrammatically in FIG. 10 comprises a frame 31 which supports a beam 4 from which the warp threads 2 unfold in any known manner.
  • the beam is shown in the upper part of the machine, but it can occupy any other position well known to those skilled in the art.
  • the weft threads 12 are unwound from one or more reels such as 32 placed outside the machine.
  • the weft threads are inserted, in a known manner, using two needles 13-13 'each performing an alternating movement, the elongated maximum tion leads the pliers 33-33 'substantially in the middle of the width.
  • the weft thread brought by the needle 13 is then taken by the needle 13 'which makes it travel the second half of the crowd.
  • the comb 10 driven by the leaf 34 cups the newly inserted pick against the front line of the fabric 16 which is wound on the roller 18.
  • each of the needles 13-13 ' is controlled by a mechanism 35-35' describing a Cardan circle and communicating to the corresponding needle a sinusoidal movement.
  • Such a mechanism when produced according to the aforementioned patent makes it possible to actuate the needles, with safe exchange of the weft thread, at a rate of approximately 450 to 600 strokes / minute.
  • the mass and the amplitude of movement of the parts in reciprocating motion prevent correct operation at such rates.
  • the frames have a stroke reduced by about half (see Figures 8 and 9) and their weight is much lower, since their thickness does not exceed 7 mm instead of 12 mm on average on a conventional loom.
  • the height of the comb therefore its weight, is also reduced by about half and its stroke, at the level of the bisector of the crowd, does not exceed approximately 50 mm (44 mm for a distance a of 65 mm) instead of 100 mm approximately on a conventional loom.
  • FIG. 11 shows the different phases of a weaving cycle during which the mechanism 35-35 ′ for actuating the needles describes the circumference y.
  • the pliers 33-33 'of the needles 13-13' exchange the weft in the middle of the width. Between E and F, the needles 13-13 'stand out in such a way that at F the pliers 33-33' have reached the edges of the width, then continue to move back to G. Then they start in the opposite direction and the needle 13 grasps the thread 12 around H, just before entering the crowd, and transports it to the middle of the width where the clamp 33 reaches E.
  • the needles are completely pulled out of the crowd and it is during this period that the comb is struck and at least part of the movement of the frames to change the crowd, so that the crowd is completely open when the needles re-enter the crowd (point H).
  • the FGH arc measures approximately 120 ° (1/3 of the cycle) because the inertia of the entire comb and leaf, as well as that of the frames, prevents the duration of the strike from being reduced .
  • the inertia of the organs driven by an alternating movement is much lower and it is possible to actuate these organs on a much reduced arc of the machine cycle, for example 90 ° or 100 ° only for the movement of the leaf.
  • the speed of the clamp 33 animated by a sinusoidal movement is proportional to the sine of the angle. This speed is therefore greater in H than in H '. If the weft thread 12 is gripped by the clamp 33 takes place at H ′, the shock absorbed by the thread 12 will be less, therefore the risk of breakage will be reduced.
  • the hands 13-13 will benefit from an increased cycle time (260 to 270 ° instead of 240 °) for the useful portion of their stroke in the crowd.
  • FIG. 13 A part of a loom according to the invention is shown diagrammatically in FIG. 13 in which the weft is inserted by means of a system called "inertia", for example of the kind described in French patent No. 2,477. 587.
  • the pick to be inserted forms a loop of which one strand is held and the other free.
  • the latter is accelerated to a given speed which gives the wire kinetic energy proportional to its mass. This kinetic energy is used to propel the loop through the crowd; the loop moves gradually until the end of the free strand has reached the edge opposite the side of the launch.
  • the launching system with inertia can essentially comprise: a deliverer 41 delivering the pick 12 into an accumulation member 42; insertion rollers 43; a turntable 44 provided with clamps 45-46; and a knife 47.
  • the pick is launched, in a loop, in crowd F, by the launching rollers 43.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP19830400026 1982-01-20 1983-01-05 Schnelldrehende schützenlose Webmaschine Expired EP0084471B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8200839A FR2520013A1 (fr) 1982-01-20 1982-01-20 Machine a tisser sans navette a grande vitesse
FR8200839 1982-01-20

Publications (2)

Publication Number Publication Date
EP0084471A1 true EP0084471A1 (de) 1983-07-27
EP0084471B1 EP0084471B1 (de) 1985-04-17

Family

ID=9270155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830400026 Expired EP0084471B1 (de) 1982-01-20 1983-01-05 Schnelldrehende schützenlose Webmaschine

Country Status (6)

Country Link
EP (1) EP0084471B1 (de)
JP (1) JPS58126347A (de)
BR (1) BR8300250A (de)
DE (1) DE3360114D1 (de)
FR (1) FR2520013A1 (de)
PL (1) PL240226A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477587A1 (fr) * 1980-03-05 1981-09-11 Albert Moessinger Dispositif pour l'insertion d'un fil de trame dans la foule d'un metier a tisser
FR2477586A1 (fr) * 1980-03-07 1981-09-11 Alsacienne Constr Meca Dispositif de commande de l'insertion de trame dans un metier a tisser sans navette et metier a tisser pourvu d'un tel dispositif

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477587A1 (fr) * 1980-03-05 1981-09-11 Albert Moessinger Dispositif pour l'insertion d'un fil de trame dans la foule d'un metier a tisser
FR2477586A1 (fr) * 1980-03-07 1981-09-11 Alsacienne Constr Meca Dispositif de commande de l'insertion de trame dans un metier a tisser sans navette et metier a tisser pourvu d'un tel dispositif

Also Published As

Publication number Publication date
EP0084471B1 (de) 1985-04-17
BR8300250A (pt) 1983-10-25
PL240226A1 (en) 1983-08-29
FR2520013A1 (fr) 1983-07-22
FR2520013B1 (de) 1984-03-23
JPS58126347A (ja) 1983-07-27
JPS6125818B2 (de) 1986-06-17
DE3360114D1 (en) 1985-05-23

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