EP3933084B1 - Métier à tricoter à chaîne avec un mécanisme de changement de direction - Google Patents

Métier à tricoter à chaîne avec un mécanisme de changement de direction Download PDF

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Publication number
EP3933084B1
EP3933084B1 EP20182789.6A EP20182789A EP3933084B1 EP 3933084 B1 EP3933084 B1 EP 3933084B1 EP 20182789 A EP20182789 A EP 20182789A EP 3933084 B1 EP3933084 B1 EP 3933084B1
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EP
European Patent Office
Prior art keywords
drive
knitting machine
warp knitting
machine according
arrangement
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.)
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Application number
EP20182789.6A
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German (de)
English (en)
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EP3933084A1 (fr
Inventor
Jürgen List
Ahmad Al Ahmad
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.)
Karl Mayer Stoll R&D GmbH
Original Assignee
Karl Mayer Stoll R&D GmbH
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Karl Mayer Stoll R&D GmbH filed Critical Karl Mayer Stoll R&D GmbH
Priority to EP20182789.6A priority Critical patent/EP3933084B1/fr
Priority to CN202110093289.6A priority patent/CN113930892B/zh
Publication of EP3933084A1 publication Critical patent/EP3933084A1/fr
Application granted granted Critical
Publication of EP3933084B1 publication Critical patent/EP3933084B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
    • D04B27/24—Thread guide bar assemblies
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
    • D04B27/24—Thread guide bar assemblies
    • D04B27/26—Shogging devices therefor
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/06—Needle bars; Sinker bars
    • D04B27/08—Driving devices therefor

Definitions

  • the present invention relates to a warp knitting machine according to the preamble of claim 1.
  • Such a warp knitting machine is, for example, from GB 1 133 027 A known.
  • Another warp knitting machine showing the features of the preamble is off U.S. 3,464,236 A known.
  • Knitting tools work together to form stitches of a knitted fabric.
  • Knitting tools include knitting needles, also known as working needles, and guide needles.
  • the knitting needles must therefore carry out a rising and a falling movement in a machine formation cycle.
  • the guide needles must guide threads of a chain around the knitting needles. Accordingly, in a stitch formation cycle, they are moved parallel to the longitudinal direction in one direction, then transverse to the longitudinal direction, parallel to the longitudinal direction in the opposite direction and transverse to the longitudinal direction back again.
  • the movement of the guide needles parallel to the longitudinal direction is also referred to as "offset movement".
  • the bars are usually driven by a main shaft.
  • the main shaft has several connecting rod sections which are engaged by connecting rods which act on the bars via lever linkages.
  • vibrations in the operation of the warp knitting machine are a problem that can limit, for example, the operating speed of the warp knitting machine.
  • WO 92/13127 A1 shows a warp knitting machine, in particular a galloon crochet machine, with a summation gear that has a plurality of displacement elements and a displacement element arranged between them. Each displacement element has two different thicknesses. Depending on the thickness of the displacement element that is shifted between the displacement elements, there is a different movement of a guide bar connected to the summation gear.
  • EP 3 081 681 A1 shows a knitting tool bar with a body that has a knitting tool holder.
  • An absorber arrangement is provided in the body, which has a spring with variable stiffness.
  • EP 3 159 43 A1 shows another warp knitting machine with at least one spring arrangement, which is arranged in a thread tension compensation device between a warp beam and a knitting area.
  • This spring arrangement has a gas spring.
  • the object of the invention is to keep vibration problems small.
  • a rotating main shaft is therefore dispensed with for this bar and the movement of the bar is generated by a translational movement of the drive ram.
  • This movement is parallel to the bar in question.
  • the change of direction gear now converts this movement parallel to the bar into a movement approximately perpendicular to the bar.
  • This movement can be carried out via a lever arrangement that certainly corresponds to a conventional lever arrangement can be transferred to the bar.
  • vibration loads are also caused by changing forces.
  • the drive ram must be moved back and forth. However, these forces act in the longitudinal direction of the bars and thus also in the direction in which the warp knitting machine has its greatest extent. The warp knitting machine is therefore significantly stiffer in this direction than transversely to the longitudinal direction. This is also a measure to keep vibration problems small.
  • the direction change gear has a wedge surface arrangement.
  • a wedge surface arrangement has at least one wedge surface which is inclined to the longitudinal direction of the bar. When the wedge surface arrangement is moved parallel to the longitudinal direction, it displaces an element lying against the wedge surface arrangement transversely to the longitudinal direction.
  • the wedge surface arrangement preferably has a wedge surface which is detachably fixed on the drive ram.
  • the wedge surface can thus be displaced parallel to the longitudinal direction on the drive ram until it has reached its predetermined position. In this position, the wedge surface can then be fixed on the drive ram, for example by a clamp.
  • changes in the operating behavior of the warp knitting machine can also be achieved in a simple manner by shifting the wedge surface on the drive ram. For example, individual bar movements may be triggered sooner or later.
  • the wedge surface is preferably formed on a wedge surface carrier which is round in cross-section transversely to the longitudinal direction.
  • the wedge surface carrier can have a circular cross section, for example.
  • the direction change gear preferably has a recirculating ball guide.
  • the recirculating ball guide keeps friction that occurs between the wedge surface and an element driven by the wedge surface small.
  • the bar is preferably connected to the change-of-direction gear via a lifting ram and the drive ram passes through the lifting ram or the lifting ram passes through the drive ram.
  • the lifting ram acts on a lever linkage, which in turn causes the movement of the bar.
  • the term "lifting ram" is chosen here for reasons of clarity. In many cases, the lifting ram will move approximately parallel to the direction of gravity. But this is not mandatory. If the lifting ram passes through the driving ram or the driving ram through the lifting ram, then one can use a continuous lifting ram and a continuous driving ram and still achieve a relatively even distribution of force on these two elements.
  • the drive arrangement preferably has a spring arrangement which acts transversely to the longitudinal direction.
  • the spring arrangement can be used here as an "energy store”.
  • the spring assembly is loaded when the bar moves from a neutral position and relaxes again when the bar moves back to the neutral position. The same can apply to a movement of the barre out of the neutral position in the other direction.
  • the spring assembly is matched to the movement of the bar and associated drive assembly so that it resonates at a rated operating speed.
  • the drive arrangement only has to apply minor drive forces, namely forces that are necessary to compensate for the losses due to friction and the like. If the bar is deflected upwards from its rest position, which can also be referred to as the neutral position, for example, lifting work must be performed and the spring arrangement is tensioned.
  • the bar now has potential energy and span energy. When the bar reaches its top dead center, it changes direction and moves back. The potential energy and clamping energy is converted into kinetic energy, which reaches its greatest value when passing through the neutral position. With further movement, this kinetic energy is converted back into clamping energy until the bottom reversal point is reached. When the bar then moves back up, the clamping energy is converted back into kinetic energy. This cycle continues periodically. An initially introduced energy is largely retained. You only have to compensate for friction losses that occur in bearings and during the knitting process in order to keep the bar moving permanently.
  • the spring arrangement preferably has variable rigidity. You can then adjust the stiffness of the spring assembly to different operating conditions. For example, when the warp knitting machine is started up, the spring arrangement can be operated with a relatively low level of rigidity, so that the drive arrangement does not have to overcome an additional high spring force. With increasing working speed of the warp knitting machine, the rigidity of the spring arrangement can then be increased.
  • the spring arrangement has at least one gas spring.
  • a gas spring which can be operated with compressed air or another gas, for example, allows the stiffness of the spring arrangement to be adjusted in a simple manner.
  • the drive arrangement preferably has a plurality of drive motors which act on different bars via drive rams. So you can use a separate drive motor for each bar. This has the added benefit that the movements of the bars are no longer all through one main wave are coupled to each other. Rather, each bar can be controlled individually, so to speak, so that the cooperation of the knitting tools can also be changed. For example, you can change the knock-off by letting the sinker intervene sooner or later in the stitch-forming process. This opens up new possibilities for the design of knitted goods.
  • the drive arrangement preferably has at least two change-of-direction gears, each with a drive tappet, the drive tappets being driven in opposite directions.
  • the drive rams then have wedge surface arrangements with opposite inclinations. If two drive rams are driven in opposite directions to one another, then they also generate reaction forces directed in opposite directions, which act on the machine bed of the warp knitting machine. These oppositely directed reaction forces can then at least partially balance each other out, so that the sum of the forces acting on the machine bed can be kept small and vibration excitation can accordingly also be kept small.
  • Drive motors of the drive rams are preferably arranged at opposite ends of the warp knitting machine in the longitudinal direction. This makes good use of the available space.
  • At least one drive motor is preferably designed as a linear drive.
  • a linear drive can have a rotary motor, for example, which acts on a nut via a screw spindle, which in turn drives the drive plunger. With such a linear drive, movements of the drive ram can be controlled very precisely in a simple manner.
  • At least one drive motor is designed as a rotary drive.
  • the rotary drive can be driven, for example, via a pot eccentric, a cam or a connecting rod.
  • the warp knitting machine 1 shows a warp knitting machine 1 with a machine bed 2 in a highly schematic form.
  • the warp knitting machine 1 has several bars, not shown in detail, of which each bar carries knitting tools.
  • the bars are suspended from levers 9, 10 driven by a drive assembly located in the machine bed 2.
  • the bars have a longitudinal direction.
  • the longitudinal direction corresponds to the width direction of the in 1 illustrated warp knitting machine 1, so the extension from left to right based on the representation of 1 .
  • each drive ram 3-6 is connected to a drive motor 7,8.
  • the drive motors 7, 8 are arranged at one end of the warp knitting machine 1.
  • the drive motors 7 , 8 can also be arranged at both ends of the warp knitting machine 1 .
  • the drive motors 7, 8 drive the drive rams 3-6 in a translatory manner, ie parallel to the width direction of the warp knitting machine 1 or in the longitudinal direction of the bars.
  • each of the levers 9, 10 carrying a bar is connected via a plurality of lifting rams to the drive rams assigned to the respective bar.
  • a lifting ram 11 is shown here, which connects a lever 9 to the drive ram 3 .
  • the drive ram 3 is used here to generate a movement of a foundation bar
  • the drive ram 4 is used to generate a movement of a slide bar
  • the drive ram 5 is used to generate a movement of a comb bar
  • the drive ram 6 is used to generate a movement of a needle bar.
  • the drive ram 3 is moved back and forth in the direction of the double arrow 12 by the drive motor 7 .
  • the lifting ram 11 on the other hand, must be moved in the direction of a double arrow 13 perpendicular to the first-mentioned direction (double arrow 12).
  • the drive arrangement has a change of direction gear 14 which, in the present case, is designed as a “wedge gear” and has a wedge surface arrangement with a wedge surface 15 .
  • the wedge surface arrangement has a wedge surface carrier 16 which has, for example, a cylindrical outer contour.
  • the drive ram 3 is passed through a bore 17 in the wedge surface carrier 16 and fixed to the drive ram 3 by clamps 18 , 19 .
  • the clamps 18, 19 can be released. This has several advantages.
  • the wedge surface carrier 16 can be positioned relatively precisely on the drive ram 3 . This positioning can be changed, if desired, in order to change the performance of the warp knitting machine 1.
  • the lifting ram 11 is provided with a guide 20 through which the wedge surface carrier 16 is guided.
  • a recirculating ball guide 21 is provided between the guide 20 and the wedge surface carrier 16, so that the wedge surface carrier 16 and the guide 20 can interact with little friction.
  • the lifting ram 11 is moved upwards over the wedge surface 15. In a corresponding manner, the lifting ram 11 is moved downwards when the driving ram 3 is moved to the left.
  • the lifting ram 11 is provided with a spring arrangement 22 .
  • the spring assembly 22 may be positioned on either side of the guide 20 as shown.
  • the spring arrangement 22 serves as an energy store.
  • the upper part of the spring assembly 22 is compressed when the lifting ram 11 moves up and relaxes when the lifting ram 11 is moved down.
  • the lower part of the spring assembly 22 is compressed when the lift ram 11 moves down and relaxes when the lift ram 11 moves up.
  • the directions refer to the representation of the 3 .
  • a neutral position of the lifting ram 11 which corresponds to a neutral position of the bar driven by the lifting ram 11 , the spring arrangement 22 does not exert any forces on the lifting ram 11 . Provision can be made for only one half of the spring arrangement 22 to become effective when the lifting ram moves out of the neutral position in one direction. However, it can also be provided that the spring arrangement 22 becomes effective overall.
  • the spring assembly 22 When a bar is raised from its neutral position, the spring assembly 22 is tensioned and so to speak stores tension energy. Tensioning can take place in that a compression spring is compressed. It is also possible that a tension spring is tensioned. When the bar has then reached its upper reversal point, the clamping energy is at its maximum. When the bar is then moved back down, the clamping energy, i.e. potential energy, is converted into kinetic energy. When passing through the neutral position, the clamping energy is minimal and the kinetic energy is maximal. With further movement of the bar, the spring arrangement 22 is tensioned in the opposite direction and thereby stores tensioning energy again. This clamping energy is in turn used to move the bar up. This cycle continues periodically. The energy supplied at the beginning is retained, so that you only have to compensate for losses that occur gradually in bearings due to friction and during the knitting process, in order to keep the bar permanently in the periodic movement.
  • the spring arrangement 22 is dimensioned in such a way that it resonates at a predetermined working speed of the warp knitting machine 1 .
  • the drive arrangement with the drive ram 3 and the drive motor 7 as well as the direction change gear 14 only has to apply relatively small forces, namely the forces necessary to overcome losses caused by friction and the like.
  • the spring assembly 22 is shown here schematically as a helical spring.
  • the spring arrangement 22 has a variable rigidity. It can thus be taken into account that the drive motor 7 does not have to additionally overcome the force of a very stiff spring arrangement 22 when the warp knitting machine is started up, ie when the working speed is increased. So you can make the stiffness of the spring assembly 22 smaller at low speeds than at higher speeds.
  • the spring arrangement 22 it is preferable for the spring arrangement 22 to be designed with a gas spring.
  • FIG. 4 shows a modified embodiment, in which the same elements are provided with the same reference numbers.
  • the drive ram 3 no longer passes through the wedge surface carrier 16 , but the wedge surface carrier 16 is arranged above the drive ram 3 .
  • the lifting ram 11 has an opening 23 through which the drive ram 3 is guided.
  • the wedge surface carrier 18 is in turn fastened to the drive ram 3 with clamps 18 , 19 .
  • the drive motor 7 is arranged on the other side of the drive ram 3 in this case, to show that the drive motors 7, 8 can be provided at both ends of the warp knitting machine 1.
  • the wedge surface carrier 6 is arranged above the drive ram 3 . However, it can also be arranged below the drive plunger 3 .
  • FIG. 5 now shows a detail of the warp knitting machine 1 with two drive rams 4, 5.
  • the drive ram 4 is provided with a wedge surface 15', which is inclined from top left to bottom right, while the drive ram 5 is provided with a wedge surface 15'', which is provided from left down to the top right.
  • Each drive ram 4, 5 acts on a lifting ram 11. However, these two lifting rams 11 are arranged one behind the other, so that only one lifting ram 11 can be seen. If the two lifting rams 11 are to be moved in the same way, for example both upwards, the drive ram 4 is moved in the direction of an arrow 24 from left to right and the drive ram 5 is moved in the direction of an arrow 25 from right to left.
  • the two drive rams 4, 5 are therefore driven in opposite directions, so that the reaction forces resulting from the drive of the drive rams 4, 5 on the machine bed 2 can be at least partially compensated.
  • the drive motors 7, 8 can be designed as linear drives.
  • a rotary motor can be used, for example, which drives a spindle on which a non-rotatably held nut is arranged, which in turn is connected to the respective drive ram 3-6.
  • the drive motor or motors 7, 8 can also be designed as rotary drives.
  • a rotary motor can again be provided, which acts via an eccentric or another cam disk or via a connecting rod in the respective drive ram 3 .
  • the drive rams 3-6 are moved translationally, namely parallel to the longitudinal direction of the bars, ie in the width direction of the warp knitting machine.
  • the warp knitting machine 1 has its greatest rigidity in this direction.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Claims (13)

  1. Métier à tricoter à chaîne (1) avec plusieurs barres, qui comportent respectivement une direction longitudinale et un système d'entraînement agissant sur les barres transversalement à la direction longitudinale, qui comporte au moins un moteur d'entraînement (7, 8), sachant que le système d'entraînement comporte au moins un poussoir d'entraînement (3-6) déplaçable par le moteur d'entraînement (7, 8) dans la direction longitudinale, qui agit sur au moins une barre par un mécanisme de changement de direction (14), caractérisé en ce que le mécanisme de changement de direction (14) comporte un système à face cunéiforme.
  2. Métier à tricoter à chaîne selon la revendication 1, caractérisé en ce que le système à face cunéiforme comporte une face cunéiforme (15) définie de façon amovible sur le poussoir d'entraînement (3-6).
  3. Métier à tricoter à chaîne selon la revendication 2, caractérisé en ce que la face cunéiforme (15) est constituée sur un support à face cunéiforme rond (16) en section transversalement à la direction longitudinale.
  4. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le mécanisme de changement de direction (14) comporte un guidage à recirculation de billes (21).
  5. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la barre sur laquelle agit le mécanisme de changement de direction est reliée au mécanisme de changement de direction (14) par un poussoir (11) et le poussoir d'entraînement (3-6) traverse le poussoir (11) ou le poussoir (11) traverse le poussoir d'entraînement (3-6) .
  6. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le système d'entraînement comporte un système à ressort (22) agissant transversalement par rapport à la direction longitudinale.
  7. Métier à tricoter à chaîne selon la revendication 6, caractérisé en ce que le système à ressort (22) présente une rigidité modifiable.
  8. Métier à tricoter à chaîne selon la revendication 6 ou 7, caractérisé en ce que le système à ressort (22) comporte au moins un ressort pneumatique.
  9. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le système d'entraînement comporte plusieurs moteurs d'entraînement (7, 8), qui agissent respectivement sur différentes barres par le biais de poussoirs d'entraînement (3-6).
  10. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le système d'entraînement comporte au moins deux mécanismes de changement de direction (14) avec respectivement un poussoir d'entraînement (4, 5), sachant que les poussoirs d'entraînement (4, 5) sont entraînés en sens inverse.
  11. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 10, caractérisé en ce que des moteurs d'entraînement (7, 8) des poussoirs d'entraînement (3-6) sont disposés aux extrémités du métier à tricoter (1) opposées dans la direction longitudinale.
  12. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'au moins un moteur d'entraînement (7, 8) est constitué comme un entraînement linéaire.
  13. Métier à tricoter à chaîne selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'au moins un moteur d'entraînement (7, 8) est constitué comme un entraînement par rotation.
EP20182789.6A 2020-06-29 2020-06-29 Métier à tricoter à chaîne avec un mécanisme de changement de direction Active EP3933084B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20182789.6A EP3933084B1 (fr) 2020-06-29 2020-06-29 Métier à tricoter à chaîne avec un mécanisme de changement de direction
CN202110093289.6A CN113930892B (zh) 2020-06-29 2021-01-25 经编机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20182789.6A EP3933084B1 (fr) 2020-06-29 2020-06-29 Métier à tricoter à chaîne avec un mécanisme de changement de direction

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EP3933084A1 EP3933084A1 (fr) 2022-01-05
EP3933084B1 true EP3933084B1 (fr) 2022-06-22

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1133027A (en) * 1966-06-14 1968-11-06 Mayer Textilmaschf Improvements in and relating to raschel knitting machines
US3464236A (en) * 1968-01-31 1969-09-02 Bassist Rudolf G Knitting machine employing compensating motion for knitting effect thread
DE4113953A1 (de) * 1991-01-24 1992-07-30 Textilma Ag Kettenwirkmaschine, insbesondere haekelgallonmaschine
JP3856068B2 (ja) * 1998-11-16 2006-12-13 Ｙｋｋ株式会社 細幅クロッシェ編機における複合編針の作動機構
EP3081681B1 (fr) * 2015-04-15 2017-03-22 Karl Mayer Textilmaschinenfabrik GmbH BARRE POUR ÉlÉMENTS DE TRICOTAGE Á MAILLES JETÉES
ES2959420T3 (es) * 2015-10-23 2024-02-26 Karl Mayer Stoll R&D Gmbh Máquina de tejido de punto por urdimbre

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CN113930892B (zh) 2024-05-17
EP3933084A1 (fr) 2022-01-05
CN113930892A (zh) 2022-01-14

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