EP3987094B1 - Shed-forming device - Google Patents
Shed-forming device Download PDFInfo
- Publication number
- EP3987094B1 EP3987094B1 EP20742480.5A EP20742480A EP3987094B1 EP 3987094 B1 EP3987094 B1 EP 3987094B1 EP 20742480 A EP20742480 A EP 20742480A EP 3987094 B1 EP3987094 B1 EP 3987094B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heddle
- shed
- warp thread
- yarn
- forming device
- 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.)
- Active
Links
- 238000009941 weaving Methods 0.000 claims description 32
- 244000208734 Pisonia aculeata Species 0.000 claims description 15
- 238000011161 development Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C3/00—Jacquards
- D03C3/24—Features common to jacquards of different types
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C3/00—Jacquards
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/04—Control of the tension in warp or cloth
- D03D49/12—Controlling warp tension by means other than let-off mechanisms
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/04—Control of the tension in warp or cloth
- D03D49/12—Controlling warp tension by means other than let-off mechanisms
- D03D49/14—Compensating for tension differences during shedding
Definitions
- the invention concerns a shed-forming device comprising a jacquard device with a number of heddles for positioning at least one associated warp thread, wherein each heddle is connected to a pull-back element for exerting a downward force on the heddle.
- one or more weft threads are inserted into a shed formed between the warp threads.
- the various warp threads In order to weave according to a predefined weaving pattern, the various warp threads must be correctly positioned in each shed relative to one or more levels at which weft threads are inserted.
- a jacquard machine is used for positioning several warp threads differently in each shed.
- Positioning takes place by means of heddles which are connected to respective hooks via cords, wherein each heddle has a heddle eye.
- the hooks can be moved up and down by means of upwardly and downwardly moving knives, and selected by selection means so as to be held or not held in one of a number of possible positions.
- Each warp thread extends through a heddle eye of a heddle, so that each different position of the heddle corresponds to a different position of the warp thread.
- each heddle is connected to a pull-back spring which is provided for exerting a downward force on the heddle.
- the extension of the spring In the lowest position of a heddle, the extension of the spring is at its smallest, so that the downward force exerted by this pull-back spring on the heddle is then at a minimum.
- the pull-back spring is selected such that this minimum force is still just sufficient to allow the hook connected to the heddle to engage correctly on a selection edge of a knife.
- a shed forming device according to the preamble of claim 1 is known from FR 3 047 744 A1 .
- the warp threads which extend through the heddle eye also exert an upward force on the heddle. This is the result of the yarn tension in these warp threads.
- the pull-back spring In this lowest position, the pull-back spring must therefore exert a downward force on the heddle which is greater than said upward force, and the resulting downward force must also be just sufficient to allow the selection hook to engage on a selection edge of a knife. Consequently, this minimum downward tensile force may not be too small.
- the object of this invention is to remedy these disadvantages.
- the shed-forming device comprises, per heddle, a yarn tensioning element which is provided to change the yarn tension in at least one associated warp thread
- the shed-forming device comprises a control or steering unit which is provided, in cooperation with the respective yarn tensioning elements, for steering or controlling the yarn tension in at least one associated warp thread separately for each heddle, such that the total downward force on the heddle is brought to a specific value or varies according to a specific profile.
- the tension profile in the warp yarn can be steered or controlled by means of a shed-forming device according to this invention such that at all times, the combined effect of the yarn tension and the spring exerts a downward force on the heddles which is sufficiently large to achieve a good shed formation but reaches lower top values than with existing shed-forming devices. This means less wear, less yarn damage and a lower energy consumption.
- pull-back elements may be selected which are not as powerful. In the lowest heddle position, the yarn tension can still be steered or controlled to a lower value than with the existing shed-forming device. The pull-back element must then provide a lower force in order to achieve the minimum required downward force.
- the steering or control system may also be designed to allow the total downward force during the weaving process to take a number of successive values which are predefined.
- certain machine parameters such as machine position or machine speed, or data connected with the weaving pattern or weave structure, may be made available to the steering or control system in order to be taken into account in determining the target value for the total downward force.
- Said profile may be selected for example from a collection of two or more reference profiles or two or more reference series, such as e.g. tables or files, with at least one reference value for the yarn tension.
- a suitable reference profile or reference series may be selected.
- each yarn tensioning element comprises a roller which is driven by a motor and is in contact with at least one warp thread, and is intended to rotate in the one or the other direction of rotation in order to move said warp thread in a direction opposite the feed direction of the warp threads, or to move the warp thread or to facilitate the movement thereof, so as to move with the movement thereof (i.e. a moving warp thread) in a direction which is the same as the feed direction of the warp threads, in order to increase or decrease respectively the yarn tension in said warp thread.
- the pull-back elements may be any type of element which is designed to exert a force, such as amongst other elements in which the force is supplied at least partially by a pneumatically driven element and/or by force of gravity.
- these are elements in which the downward force is supplied at least partially, and preferably exclusively or mainly, by an elastically deformable element.
- the pull-back elements are springs.
- the yarn tensioning device preferably comprises measuring means in order, in at least one warp thread or in several (at least two) warp threads which form a part group, to measure the yarn tension or a variable which is a measure of the yarn tension.
- a steering unit is also provided with means for repeatedly or continuously comparing the measured yarn tension, or the variable which is a measure of the yarn tension, with a reference value, and when a difference is established between the measured yarn tension or variable on the one hand and the reference value on the other, generating a control signal for driving a yarn tensioning element (e.g. by adapting the current with which the motor is controlled or by adapting the motor torque) such that the difference between the measured value and the reference value is reduced.
- a yarn tensioning element e.g. by adapting the current with which the motor is controlled or by adapting the motor torque
- a control unit preferably comprises a regulator which is provided, on setting a specific target value for the yarn tension, to generate a control signal for driving a yarn tensioning element (e.g. by adapting the current with which the motor is controlled or by adapting the motor torque) such that the target value is approached or reached.
- the regulator is preferably a regulator of the type with "feed-forward control”.
- machine parameters may also be made available, such as the machine position or machine speed, or data connected with the weaving pattern or weave structure, and one or more of these parameters may be used for control or steering.
- the yarn tensioning device comprises for example detection means for detecting the status of one or more yarn tension influencing circumstances during weaving, and/or comprises storage means and/or data-processing means in order to predefine the time or phase of the weaving process at which the yarn tension influencing circumstance occurs, for example on the basis of the weaving pattern and/or on the basis of the proposed path of warp threads between the yarn store and the fabric.
- a control system is applied using a "bidirectional forced feed-forward function". This means that, on a change of movement of the yarn, the yarn tensioning unit intervenes to facilitate this change so as to react more quickly.
- a weaving machine (1) in cooperation with a jacquard device (2) is installed next to a bobbin creel (3), and a beam stand (4) with four rollers (40)-(43) each containing a yarn store is arranged in the space between the weaving machine (1) and the bobbin creel (3).
- a yarn tensioning device (6) is installed in the space between the bobbin creel (3) and the weaving machine (1), and consists of a yarn tensioning module (20) which extends in the horizontal direction parallel to a vertical plane containing the front sides (30a) of the plurality of mutually adjacent creel units (30).
- the yarn tensioning module (20) consists of two panel-like carriers (21), (22) with a flat outer surface, which run symmetrically relative to a horizontal plane towards each other in the direction of the weaving machine (1), wherein they converge and join together at an angle.
- the yarn tensioning module (20) has a V-shaped profile viewed in a vertical cross-section.
- Each carrier (21), (22) carries a large number of rows of yarn tensioning elements (8) placed closely adjacent to each other.
- a guide tube (10) is provided for guiding the warp thread without tension to a respective yarn tensioning element (8).
- the warp threads are moved further from the yarn tensioning elements (8) to a grid (100) with the same width as the yarn tensioning module (20) but with a smaller height. From the grid (100), the warp threads (11), (12) run to the weaving machine (1) where they pass through the heddle eye of a respective heddle (16), (17), shown symbolically by a vertical line with a circular widening which depicts the heddle eye.
- a respective pull-back spring (18), (19) exerts a downward force on each heddle (16), (17).
- FIG. 1 shows the situation of the prior art with the straight line (S1) which runs from the top row of bobbins in the bobbin creel (3) firstly through the grid (X) of an existing installation and then on to the grid (100), and the straight line (S2) which runs from the bottom row of bobbins in the bobbin creel (3) via the grid (X) of an existing installation and then on to the grid (100).
- the grid (X) does not form part of the installation according to this invention and is merely added to the figure in order, by comparison with the prior art, to be able to present an effect of the invention.
- the lines (S1), (S2) show the size of the angles (relative to a horizontal plane) at which the warp yarns are brought to the grid (X) and then on to the grid (100) according to the prior art, and consequently the angle which the supplied warp threads then take.
- the heddles (16), (17) are moved up and down in order to position the warp threads (11), (12) correctly according to the predefined weaving pattern.
- the pull-back springs (18), (19) in their lowest position provide the necessary downward force for allowing the shed formation to proceed correctly, but must also overcome the upwardly directed force which is a consequence of the yarn tension.
- graph line G1 shows the development of the downward force which the springs (18), (19) exert on the heddle (16), (17) (on the left vertical axis, in N) of a pile-forming pile warp thread
- graph line G2 shows the development of the alternating upward and downward component of the force (in N) which is exerted on the heddle (16), (17) as a result of the yarn tension in the pile-forming pile warp thread.
- the latter force is referred to in brief below as the "yarn tensioning force”.
- Graph line G4 shows the position of the heddle eye (in mm on the vertical axis on the right-hand side).
- Graph line G3 shows the development of the sum of the spring force and the yarn tensioning force. Here we see two high peaks (P1), (P2) of this total force.
- the graph line G3 shows the forces to which the different machine components are subjected. It should be noted that the graphs in figures 2 and 3 show the forces which are the result of movements of a single pile warp thread, whereas on a typical face-to-face weaving machine for example, 32,000 pile warp threads or more may be present.
- Figure 3 shows the development of the spring force and the yarn tensioning force on the heddle of a pile-forming pile warp thread when the yarn tension is controlled or steered so as to achieve lower peak values and a lower mean of the sum of the spring force and yarn tensioning force.
- a spring may be used with a lower spring constant and a lower spring pretension force (0.15 N lower) - this is the downwardly directed spring force when the heddle is in its lowest position.
- the pretension force may be lower because, thanks to the steering or control of the yarn tension, less upward yarn tensioning force is exerted by the pile warp thread.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Woven Fabrics (AREA)
Description
- The invention concerns a shed-forming device comprising a jacquard device with a number of heddles for positioning at least one associated warp thread, wherein each heddle is connected to a pull-back element for exerting a downward force on the heddle.
- During successive weft insertion cycles on a weaving machine, one or more weft threads are inserted into a shed formed between the warp threads. In order to weave according to a predefined weaving pattern, the various warp threads must be correctly positioned in each shed relative to one or more levels at which weft threads are inserted. A jacquard machine is used for positioning several warp threads differently in each shed.
- Positioning takes place by means of heddles which are connected to respective hooks via cords, wherein each heddle has a heddle eye. The hooks can be moved up and down by means of upwardly and downwardly moving knives, and selected by selection means so as to be held or not held in one of a number of possible positions. Each warp thread extends through a heddle eye of a heddle, so that each different position of the heddle corresponds to a different position of the warp thread.
- To allow the shed formation to take place correctly and to facilitate the downward movement of the hooks, each heddle is connected to a pull-back spring which is provided for exerting a downward force on the heddle. In the lowest position of a heddle, the extension of the spring is at its smallest, so that the downward force exerted by this pull-back spring on the heddle is then at a minimum. The pull-back spring is selected such that this minimum force is still just sufficient to allow the hook connected to the heddle to engage correctly on a selection edge of a knife.
- A shed forming device according to the preamble of
claim 1 is known fromFR 3 047 744 A1 - In the lowest position of the heddle, the warp threads which extend through the heddle eye also exert an upward force on the heddle. This is the result of the yarn tension in these warp threads. In this lowest position, the pull-back spring must therefore exert a downward force on the heddle which is greater than said upward force, and the resulting downward force must also be just sufficient to allow the selection hook to engage on a selection edge of a knife. Consequently, this minimum downward tensile force may not be too small.
- When the heddle is moved to a higher position by the knife, the downward spring force increases proportionally with the upward movement of the heddle, so as to finally reach a value which is much greater than necessary. As a result, the mean tension on the warp threads is much higher than necessary. A higher tension means more wear on machine components, more extensive and more frequent damage to the warp threads themselves, and more energy consumption of the machine.
- The object of this invention is to remedy these disadvantages.
- This object is achieved by providing a shed-forming device with the features specified in the first paragraph of this description, wherein according to this invention, the shed-forming device comprises, per heddle, a yarn tensioning element which is provided to change the yarn tension in at least one associated warp thread, and the shed-forming device comprises a control or steering unit which is provided, in cooperation with the respective yarn tensioning elements, for steering or controlling the yarn tension in at least one associated warp thread separately for each heddle, such that the total downward force on the heddle is brought to a specific value or varies according to a specific profile.
- The tension profile in the warp yarn can be steered or controlled by means of a shed-forming device according to this invention such that at all times, the combined effect of the yarn tension and the spring exerts a downward force on the heddles which is sufficiently large to achieve a good shed formation but reaches lower top values than with existing shed-forming devices. This means less wear, less yarn damage and a lower energy consumption.
- In addition, pull-back elements may be selected which are not as powerful. In the lowest heddle position, the yarn tension can still be steered or controlled to a lower value than with the existing shed-forming device. The pull-back element must then provide a lower force in order to achieve the minimum required downward force.
- The steering or control system may also be designed to allow the total downward force during the weaving process to take a number of successive values which are predefined. In some cases also certain machine parameters, such as machine position or machine speed, or data connected with the weaving pattern or weave structure, may be made available to the steering or control system in order to be taken into account in determining the target value for the total downward force.
- Said profile may be selected for example from a collection of two or more reference profiles or two or more reference series, such as e.g. tables or files, with at least one reference value for the yarn tension. During weaving then, for example on the basis of machine parameters and/or weaving pattern data, a suitable reference profile or reference series may be selected.
- In a preferred embodiment, each yarn tensioning element comprises a roller which is driven by a motor and is in contact with at least one warp thread, and is intended to rotate in the one or the other direction of rotation in order to move said warp thread in a direction opposite the feed direction of the warp threads, or to move the warp thread or to facilitate the movement thereof, so as to move with the movement thereof (i.e. a moving warp thread) in a direction which is the same as the feed direction of the warp threads, in order to increase or decrease respectively the yarn tension in said warp thread.
- The pull-back elements may be any type of element which is designed to exert a force, such as amongst other elements in which the force is supplied at least partially by a pneumatically driven element and/or by force of gravity. Preferably, these are elements in which the downward force is supplied at least partially, and preferably exclusively or mainly, by an elastically deformable element. In a most preferred embodiment, the pull-back elements are springs.
- The yarn tensioning device preferably comprises measuring means in order, in at least one warp thread or in several (at least two) warp threads which form a part group, to measure the yarn tension or a variable which is a measure of the yarn tension. Preferably, a steering unit is also provided with means for repeatedly or continuously comparing the measured yarn tension, or the variable which is a measure of the yarn tension, with a reference value, and when a difference is established between the measured yarn tension or variable on the one hand and the reference value on the other, generating a control signal for driving a yarn tensioning element (e.g. by adapting the current with which the motor is controlled or by adapting the motor torque) such that the difference between the measured value and the reference value is reduced.
- A control unit preferably comprises a regulator which is provided, on setting a specific target value for the yarn tension, to generate a control signal for driving a yarn tensioning element (e.g. by adapting the current with which the motor is controlled or by adapting the motor torque) such that the target value is approached or reached. The regulator is preferably a regulator of the type with "feed-forward control".
- In a particular embodiment of a steering or control unit, machine parameters may also be made available, such as the machine position or machine speed, or data connected with the weaving pattern or weave structure, and one or more of these parameters may be used for control or steering.
- If one or more yarn tension influencing circumstances differ for different part groups of warp threads, then in this weaving machine different reference yarn tension profiles may be determined for these part groups, and these reference yarn tension profiles may be adapted separately and if necessary differently in the different part groups during the weaving process, according to circumstances which have changed during the weaving process. The yarn tension may thereby on average be kept slightly lower while the maximum values of the yarn tension are not as high.
- The yarn tensioning device comprises for example detection means for detecting the status of one or more yarn tension influencing circumstances during weaving, and/or comprises storage means and/or data-processing means in order to predefine the time or phase of the weaving process at which the yarn tension influencing circumstance occurs, for example on the basis of the weaving pattern and/or on the basis of the proposed path of warp threads between the yarn store and the fabric.
- Preferably, in this weaving machine and according to the method of this invention, a control system is applied using a "bidirectional forced feed-forward function". This means that, on a change of movement of the yarn, the yarn tensioning unit intervenes to facilitate this change so as to react more quickly.
- Further particular features of this shed-forming device are described in the claims.
- The invention is now explained further with reference to the more detailed description which follows of a possible embodiment of a jacquard machine according to this invention. It is emphasised that the device and method described are merely examples of the general principle of the invention, and thus may in no way be regarded as a limitation of the scope of protection specified in the claims or of the area of application of the invention.
- In this detailed description, reference signs are used to refer to the attached figures, in which:
-
Figure 1 is a diagrammatic side view of a structure of a weaving machine and a bobbin creel with associated yarn tensioning device; -
Figure 2 is a graph showing the following for a pile-forming pile warp thread in a number of successive weft insertion cycles during weaving, according to the prior art:- the development of the position of the heddle eye (in mm),
- the development of the upward or downward component of the force (in N) which is exerted on the heddle as a result of the yarn tension in the pile-forming pile warp thread,
- the development of the downward spring force exerted by the pull-back spring on the heddle of the pile warp thread (in N), and
- the development of the sum of the downward spring force (in N) on the heddle and the upward or downward component of the force (in N) which is exerted on the heddle as a result of the yarn tension in the pile-forming pile warp thread.
-
Figure 3 is a graph showing the following for a pile-forming pile warp thread in a number of successive weft insertion cycles during weaving with a controlled or steered yarn tension according to the invention:- the development of the position of the heddle eye (in mm),
- the development of the upward or downward component of the force (in N) which is exerted on the heddle as a result of the yarn tension in the pile-forming pile warp thread,
- the development of the downward spring force exerted by the pull-back spring on the heddle of the pile warp thread (in N),
- the development of the sum of the downward spring force (in N) on the heddle and the upward or downward component of the force (in N) which is exerted on the heddle as a result of the yarn tension in the pile-forming pile warp thread, and
- the mean of said sum of forces.
- In a particular installation, a weaving machine (1) in cooperation with a jacquard device (2) is installed next to a bobbin creel (3), and a beam stand (4) with four rollers (40)-(43) each containing a yarn store is arranged in the space between the weaving machine (1) and the bobbin creel (3).
- A yarn tensioning device (6) is installed in the space between the bobbin creel (3) and the weaving machine (1), and consists of a yarn tensioning module (20) which extends in the horizontal direction parallel to a vertical plane containing the front sides (30a) of the plurality of mutually adjacent creel units (30). The yarn tensioning module (20) consists of two panel-like carriers (21), (22) with a flat outer surface, which run symmetrically relative to a horizontal plane towards each other in the direction of the weaving machine (1), wherein they converge and join together at an angle. The yarn tensioning module (20) has a V-shaped profile viewed in a vertical cross-section. Each carrier (21), (22) carries a large number of rows of yarn tensioning elements (8) placed closely adjacent to each other. For reasons of clarity, only three yarn tensioning elements (8) are shown for each carrier (21), (22). For each warp thread which is guided from a respective bobbin in the bobbin creel (3) to the weaving machine (1), a guide tube (10) is provided for guiding the warp thread without tension to a respective yarn tensioning element (8).
- The warp threads are moved further from the yarn tensioning elements (8) to a grid (100) with the same width as the yarn tensioning module (20) but with a smaller height. From the grid (100), the warp threads (11), (12) run to the weaving machine (1) where they pass through the heddle eye of a respective heddle (16), (17), shown symbolically by a vertical line with a circular widening which depicts the heddle eye. A respective pull-back spring (18), (19) exerts a downward force on each heddle (16), (17).
- According to the prior art, the warp threads are supplied in stretched state from the bobbin creel (3) to a first grid (X).
Figure 1 shows the situation of the prior art with the straight line (S1) which runs from the top row of bobbins in the bobbin creel (3) firstly through the grid (X) of an existing installation and then on to the grid (100), and the straight line (S2) which runs from the bottom row of bobbins in the bobbin creel (3) via the grid (X) of an existing installation and then on to the grid (100). For the sake of clarity, the grid (X) does not form part of the installation according to this invention and is merely added to the figure in order, by comparison with the prior art, to be able to present an effect of the invention. - The lines (S1), (S2) show the size of the angles (relative to a horizontal plane) at which the warp yarns are brought to the grid (X) and then on to the grid (100) according to the prior art, and consequently the angle which the supplied warp threads then take.
- During weaving, the heddles (16), (17) are moved up and down in order to position the warp threads (11), (12) correctly according to the predefined weaving pattern. The pull-back springs (18), (19) in their lowest position provide the necessary downward force for allowing the shed formation to proceed correctly, but must also overcome the upwardly directed force which is a consequence of the yarn tension.
- If the heddle is moved to a higher position for shed formation, the downward spring force increases proportionally with the upward movement of the heddle in order finally to reach a value which is much greater than necessary.
- On
figure 2 , for a number of successive weft insertion cycles (the state of the main shaft of the weaving machine is shown on the horizontal axis in degrees), graph line G1 shows the development of the downward force which the springs (18), (19) exert on the heddle (16), (17) (on the left vertical axis, in N) of a pile-forming pile warp thread; and graph line G2 shows the development of the alternating upward and downward component of the force (in N) which is exerted on the heddle (16), (17) as a result of the yarn tension in the pile-forming pile warp thread. The latter force is referred to in brief below as the "yarn tensioning force". - For the sake of clarity, where a force (spring force or yarn tensioning force) is marked as negative in
figure 2 and3 , this means that the force is pulling the heddle upward. This is clear for example because the yarn tensioning force is negative in the graph regions where the heddle is in its lowest position. It is evident that the force exerted by the yarn tension on the heddle then has an upwardly directed component which pulls the heddle upward. - Graph line G4 shows the position of the heddle eye (in mm on the vertical axis on the right-hand side).
- Graph line G3 shows the development of the sum of the spring force and the yarn tensioning force. Here we see two high peaks (P1), (P2) of this total force. The graph line G3 shows the forces to which the different machine components are subjected. It should be noted that the graphs in
figures 2 and3 show the forces which are the result of movements of a single pile warp thread, whereas on a typical face-to-face weaving machine for example, 32,000 pile warp threads or more may be present. -
Figure 3 shows the development of the spring force and the yarn tensioning force on the heddle of a pile-forming pile warp thread when the yarn tension is controlled or steered so as to achieve lower peak values and a lower mean of the sum of the spring force and yarn tensioning force. - Because of this steering or control, also a spring may be used with a lower spring constant and a lower spring pretension force (0.15 N lower) - this is the downwardly directed spring force when the heddle is in its lowest position. The pretension force may be lower because, thanks to the steering or control of the yarn tension, less upward yarn tensioning force is exerted by the pile warp thread.
- In
figure 3 , the same indications (G1), (G2), (G3) and (G4) are used for the graph lines as onfigure 2 , with the same meanings: namely the development of the downward spring force (G1), the development of the yarn tensioning force (G2), the development of the sum of the spring force and the yarn tensioning force (G3), and the position of the heddle (G4). The left vertical axis gives the values of the forces (in N), and the right vertical axis gives the values of the positions of the heddle (in mm). The horizontal axis gives the state of the main shaft of the weaving machine in degrees. - Graph line (G5) - the dotted line - gives the value of the mean of said sum of the spring force and yarn tensioning force.
- It is clear from graph line (G3) that for the total force on the heddle, the high peaks have disappeared (compare with
figure 2 , peaks P1 and P2). In addition, the mean value of this total force is lower. In the design without a steering or control system (figure 2 ), the calculated mean of this total force is 2.91 N, while in the design with control system, this total force is 2.72 N (graph line G5 onfigure 3 ). - These effects mean a lower load on the machine, wherein again it must not be forgotten that the values from the graphs show the forces which are the result of the movements of a single pile warp thread, whereas on a typical face-to-face weaving machine for example, 32,000 pile warp threads or more may be present.
- The advantageous aspects of this invention are not restricted to pile warp threads but also apply to warp threads of another type which are positioned by the jacquard device, or to single-face weaving machines.
Claims (5)
- Shed-forming device comprising a jacquard device (2) with a number of heddles (16), (17) for positioning at least one associated warp thread (11), (12), wherein each heddle is connected to a pull-back element (18), (19) for exerting a downward force on the heddle (16), (17), wherein the shed-forming device comprises, per heddle (16), (17), a yarn tensioning element (8) which is provided to change the yarn tension in at least one associated warp thread (11), (12), and that the shed-forming device comprises a control or steering unit which is provided, in cooperation with the respective yarn tensioning elements (8), for steering or controlling the yarn tension in at least one associated warp thread (11), (12) separately for each heddle (16), (17), characterised in that the yarn tension is steered or controlled by the control or steering unit such that the total downward force on the heddle (16), (17) is brought to a specific value or varies according to a specific profile.
- Shed-forming device according to claim 1, characterized in that each yarn tensioning element (8) comprises a roller which is driven by a motor and which is in contact with at least one warp thread, and which is intended to rotate in the one or the other direction of rotation in order to move said warp thread (11), (12) in a direction opposite the feed direction of the warp threads, or to move the warp thread (11), (12) or to move with the movement thereof or to facilitate the movement thereof in a direction which is the same as the feed direction of the warp threads, in order to increase or decrease respectively the yarn tension in said warp thread.
- Shed-forming device according to claim 1 or 2, characterized in that parameters of the jacquard device (2) or of a weaving machine (1) cooperating with the jacquard device, or data or parameters connected with the weaving pattern, are made available to the control or steering unit in order to be taken into account in determining the target value for the total downward force.
- Shed-forming device according to any of the preceding claims, characterized in that it comprises a storage unit in which two or more reference yarn tension profiles and/or two or more reference series of at least one reference value for the yarn tension are stored, and that the control or steering unit is provided to select a reference profile or reference series from this collection in order to use these as target value(s) or a succession of target values for steering or control.
- Shed-forming device according to any of the preceding claims, characterized in that the pull-back elements are springs (18), (19).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE20195403A BE1027384B1 (en) | 2019-06-20 | 2019-06-20 | Shed-forming device |
PCT/IB2020/055789 WO2020255066A1 (en) | 2019-06-20 | 2020-06-19 | Shed-forming device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3987094A1 EP3987094A1 (en) | 2022-04-27 |
EP3987094B1 true EP3987094B1 (en) | 2023-12-27 |
EP3987094C0 EP3987094C0 (en) | 2023-12-27 |
Family
ID=67225951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20742480.5A Active EP3987094B1 (en) | 2019-06-20 | 2020-06-19 | Shed-forming device |
Country Status (5)
Country | Link |
---|---|
US (1) | US20220316103A1 (en) |
EP (1) | EP3987094B1 (en) |
CN (1) | CN113825866B (en) |
BE (1) | BE1027384B1 (en) |
WO (1) | WO2020255066A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1027386B1 (en) * | 2019-06-20 | 2021-01-27 | Vandewiele Nv | Weaving method with regulation or control of the yarn tension in warp threads and weaving machine for producing a fabric according to this weaving method |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2421539A (en) * | 1944-10-12 | 1947-06-03 | Uxbridge Worsted Co Inc | Loom reversing mechanism |
GB795371A (en) * | 1954-03-25 | 1958-05-21 | Jardine John Ltd | Improvements in or relating to textile machines employing a jacquard |
CH547370A (en) * | 1972-01-06 | 1974-03-29 | Vnii Legkogo Textil Masch | Warp yarn tensioner - with tension adjustment for use on looms |
JPS5434460A (en) * | 1977-08-22 | 1979-03-13 | Nissan Motor | Warp tension adjusting apparatus of weaving machine |
CH635627A5 (en) * | 1979-03-01 | 1983-04-15 | Sulzer Ag | DEVICE FOR ADJUSTING THE TENSION OF A TENSIONING BOOM OF A LOOPPING MACHINE. |
CH660758A5 (en) * | 1983-03-16 | 1987-06-15 | Huemer Franz Xaver | DEVICE FOR REGULATING THE TENSION AND FOR MONITORING THE CHAIN THREADS ON A ROTARY WEAVING MACHINE. |
US4662407A (en) * | 1986-02-12 | 1987-05-05 | Albany International Corp. | Method and apparatus of controlling warp tension on a weaving loom |
JP2710046B2 (en) * | 1986-12-04 | 1998-02-10 | 津田駒工業 株式会社 | Warp tension control method for pile loom |
DE3852518T2 (en) * | 1987-05-08 | 1995-05-04 | Tsudakoma Ind Co Ltd | Method and device for controlling the tension of the pile warp thread. |
EP0350447B1 (en) * | 1988-07-08 | 1992-03-25 | GebràDer Sulzer Aktiengesellschaft | Warp tension control process and loom with a warp-tensioning device |
JP2894709B2 (en) * | 1988-12-28 | 1999-05-24 | 株式会社豊田中央研究所 | Warp speed controller |
FR2726011B1 (en) * | 1994-10-25 | 1996-12-20 | Staubli Sa Ets | NEW REMOVABLE HARNESS FOR JACQUARD MECHANICS |
EP0897026A3 (en) * | 1997-08-14 | 1999-07-07 | Lindauer Dornier Gesellschaft M.B.H | Method for controlled warp tensioning in the manufacture of more especially cord fabric for vehicle tyres on a weaving device and weaving device for carrying out this method |
JP3321412B2 (en) * | 1998-05-11 | 2002-09-03 | 津田駒工業株式会社 | Easing method |
FR2808812B1 (en) * | 2000-05-15 | 2002-07-19 | Staubli Sa Ets | METHOD AND DEVICE FOR DETECTING ABNORMALITY IN THE CROWD OF A JACQUARD BUSINESS |
BE1014071A3 (en) * | 2001-03-27 | 2003-03-04 | Wiele Michel Van De Nv | DEVICE FOR STRESS ON BRINGING IN POOL CHAIN YARN IN A weaving. |
DE10203068A1 (en) * | 2002-01-26 | 2003-08-07 | Mageba Textilmaschinen Vertrie | Loom with a warp beam |
JP2004011065A (en) * | 2002-06-07 | 2004-01-15 | Tsudakoma Corp | Pile loom |
TWI303679B (en) * | 2003-06-12 | 2008-12-01 | Textilma Ag | Loom |
EP1607501B1 (en) * | 2004-06-18 | 2007-07-25 | SCHÖNHERR Textilmaschinenbau GmbH | Method and device for shedding jacquard patterned pile warp yarns in a face to face weaving machine |
FR3047744B1 (en) * | 2016-02-15 | 2018-02-02 | Safran | JACQUARD TYPE FABRIC FOR MANUFACTURING A 3D WOVEN PREFORM |
US10851481B1 (en) * | 2016-11-29 | 2020-12-01 | Apple Inc. | Robotic weaving equipment |
CN106854792B (en) * | 2016-12-23 | 2019-02-26 | 东华大学 | The device and method that warp tension is compensated based on three-dimensional loom fabric tissue |
BE1027386B1 (en) * | 2019-06-20 | 2021-01-27 | Vandewiele Nv | Weaving method with regulation or control of the yarn tension in warp threads and weaving machine for producing a fabric according to this weaving method |
-
2019
- 2019-06-20 BE BE20195403A patent/BE1027384B1/en active IP Right Grant
-
2020
- 2020-06-19 US US17/620,581 patent/US20220316103A1/en active Pending
- 2020-06-19 CN CN202080036347.5A patent/CN113825866B/en active Active
- 2020-06-19 EP EP20742480.5A patent/EP3987094B1/en active Active
- 2020-06-19 WO PCT/IB2020/055789 patent/WO2020255066A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20220316103A1 (en) | 2022-10-06 |
CN113825866A (en) | 2021-12-21 |
BE1027384A1 (en) | 2021-01-21 |
WO2020255066A9 (en) | 2021-12-02 |
EP3987094A1 (en) | 2022-04-27 |
EP3987094C0 (en) | 2023-12-27 |
WO2020255066A1 (en) | 2020-12-24 |
BE1027384B1 (en) | 2021-01-28 |
CN113825866B (en) | 2024-04-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7111647B2 (en) | Weaving machine and method for weaving pile fabrics and spacer for such a weaving machine | |
US6092559A (en) | Device for controlling warp threads for the production of leno fabrics on a textile machine | |
CN113924391B (en) | Weaving method for controlling or regulating yarn tension in warp yarn and loom for producing fabric using the weaving method | |
EP3987094B1 (en) | Shed-forming device | |
EP0742297B1 (en) | Thread-tensioning and pull-back device for weaving machine | |
CN105220322A (en) | A kind of warp-feeding mechanism, the Rapier looms comprising this warp-feeding mechanism and control method | |
KR101557248B1 (en) | Method and weaving machine having an apparatus for monitoring thread overtension | |
CN104727007B (en) | The continuous feeding system of warp of active of carbon fiber weaving | |
US7493920B2 (en) | Shed forming device and weaving machine provided with such a shed forming device | |
CN113891964B (en) | Arrangement of a weaving machine and a yarn storage device with a matched yarn tensioning device | |
EP0461524A1 (en) | Weft yarn presenting device for gripper looms | |
EP3987092B1 (en) | Weaving machine with device and method for detecting variations in pile-forming | |
CN105926140A (en) | Sample loom capable of being used for weaving three-dimensional orthogonal multi-layer fabric and weaving method thereof | |
GB2051149A (en) | Weaving Tubular Fabrics | |
US10508366B2 (en) | Jacquard machine, face-to-face weaving machine comprising at least one jacquard machine, and method of setting up a jacquard machine | |
CN103582725B (en) | Rapier looms and corresponding weaving techniques | |
EP3121320A2 (en) | Device for adjusting the tension of the pile warp yarns in a terrycloth weaving loom | |
JPH04136228A (en) | Jacquard style opening device and feed device | |
ADANUR et al. | RP WALKER | |
KR20140034489A (en) | Natural fiber warp supplying method, weaving method and textile by the method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20220107 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230504 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20230830 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602020023424 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
U01 | Request for unitary effect filed |
Effective date: 20240123 |
|
P04 | Withdrawal of opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20240126 |
|
U07 | Unitary effect registered |
Designated state(s): AT BE BG DE DK EE FI FR IT LT LU LV MT NL PT SE SI Effective date: 20240131 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240328 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240328 |