EP1509646A1 - Vorrichtung und verfahren zum trennen eines fadens - Google Patents
Vorrichtung und verfahren zum trennen eines fadensInfo
- Publication number
- EP1509646A1 EP1509646A1 EP03755946A EP03755946A EP1509646A1 EP 1509646 A1 EP1509646 A1 EP 1509646A1 EP 03755946 A EP03755946 A EP 03755946A EP 03755946 A EP03755946 A EP 03755946A EP 1509646 A1 EP1509646 A1 EP 1509646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- blade
- movement
- armature
- electric drive
- 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
Links
Classifications
-
- 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
- D03D49/70—Devices for cutting weft threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H54/00—Winding, coiling, or depositing filamentary material
- B65H54/70—Other constructional features of yarn-winding machines
- B65H54/71—Arrangements for severing filamentary materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the invention relates to a device for cutting a thread, which has two blades, at least one of which can be moved relative to the other by means of an electric drive, and a method for cutting a thread.
- a device for cutting a weft thread for a weaving machine is known (DE 2230099), which has two blades which are movable relative to one another. This device is placed near the fabric edge to cut a weft thread that is picked up by a gripper and transported into the shed. To improve the cutting process, the blades are pressed against each other by spring force. One of the blades is driven by a cam system, which in turn is driven by the weaving machine.
- Such a device has the disadvantage that the speed of the movement of the blades during cutting is determined by the speed of the drive means, the speed of which is determined by the speed of the weaving machine.
- a device of the type mentioned at the outset is also known (EP 0284766 A1) which contains an electric drive motor as the drive. A problem with this known device is that the relative speed of the blades when cutting a thread is determined by the control and properties of the electrical drive means.
- the invention has for its object to provide a device of the type mentioned, in which the speed of the movement of the blades during the cutting process is independent of the speed of the loom or properties of an electric drive.
- the at least one movable blade can be moved by the drive against the action of at least one spring element into a position from which it can be moved back by means of the force of the at least one spring element in order to carry out a separation process.
- the invention offers the advantage that the speed of the movement of the blades is independent of the drive means and can therefore be selected depending on the thread to be separated, in particular a weft thread of a weaving machine.
- the speed of the relative movement between the blades is essentially determined by the natural frequency of the means that hold the movable blade and move with the blade.
- the use of the device according to the invention in weaving machines leads to the advantage that the speed of the separation is independent of the weaving speed of the weaving machine and independent of the response times and reaction times of the electrical drive means.
- the speed for cutting can be sufficient in all cases be set high enough to enable a perfect cutting of a weft thread. This is particularly advantageous if the weaving machine is operated at slow speed and a weft has to be separated or cut through.
- both blades can be moved into a supply with opposite movement by means of electric drives and can be moved back by means of spring elements. This means that significantly higher cutting speeds can be achieved than with a stationary and only one movable blade.
- the blade or blades are each held by means of pairs of leaf springs which are aligned transversely to the direction of movement of the associated blade and are arranged at a distance parallel to one another. Since the blades do not have to make too large movements and since the leaf springs themselves can have a relatively large length, it is possible in this way to move the blades essentially in a straight line without the need for guides.
- the blade or blades are connected to an armature containing at least one permanent magnet, to which an electromagnet is assigned.
- the two blades are provided with anchors, the permanent magnets of which are arranged such that they are opposed to one another with poles of the same name and in the disconnected position with poles of the same name.
- the anchors and thus also the blades attract each other while they are in the area in which the separation process takes place. This improves the cutting process.
- the anchors, and hence the blades repel while they are in the area of deployment, causing the Wear of the blades moving relative to each other is reduced.
- a common electromagnet is provided for the armatures of both blades, the permanent magnets of the armatures being oriented in opposite directions.
- the common electromagnet causes the two anchors to move with their blades in opposite directions when excited.
- the two units comprising the blade, anchor and leaf springs are designed for different natural frequencies.
- the natural frequency can be determined by the choice of the mass of the unit consisting of leaf springs, armature and blade and the choice of the spring characteristic of the leaf spring. It is advantageous if the speeds of the movement selected by the natural frequency are set so differently that the position in which the cutting takes place differs from the rest position when the electromagnets are not energized. It can thus be achieved that the device in rapier weaving machines is in a rest position, which is assumed when the electric drive means are not energized, above the fabric, so that the weft threads can pass under the device when struck. Nevertheless, the weft threads can be severed at the level of the fabric.
- a CAN bus system is provided for a control unit of the electric drive (s).
- the object is achieved by a method in which the electric drive moves the at least one blade against a spring force into a supply and this blade is moved back out of the supply to carry out a separation process at least by means of the spring force.
- the electric drive is activated while the associated blade is moved back out of the supply by means of spring force. This can be used to influence the speed and the course of the movement during the separation.
- the electric drive brakes the associated blade while moving back from the supply, in particular after performing the separation process.
- a signal dependent on the movement of an armature of the electric drive is formed, by means of which the course of the movement of the associated blade is monitored.
- This signal which consists for example of a voltage, serves as feedback for the control of the device according to the invention.
- FIG. 1 shows a device according to the invention in a rest position
- 2 shows the device according to FIG. 1, with some components being omitted to increase clarity
- FIG. 3 is a vertical section of FIG. 2,
- FIG. 4 shows the device according to FIG. 1 (with the omission of further components) in a provision
- Fig. 5 shows the device of FIG. 1 in a separation position
- FIG. 6 is a partial view in the direction of arrow F6 of FIG. 1st
- the device according to the invention shown in FIG. 1 has two blades 2 and 3 which are movable relative to one another and electrical drive means in order to move these blades 2, 3 relative to one another.
- the blade 2 is connected to an armature 5, which is held movably by means of leaf springs 6, 7.
- the blade 3 is connected to an anchor 8 which is movably held by means of leaf springs 9, 10.
- the leaf springs 6, 7 and 9, 10 are aligned transversely to the direction of movement of the blades 2, 3 and are arranged parallel and at a distance from one another.
- the anchors 5, 8 are each provided at their two ends with relatively long leaf springs 6, 7; 9, 10 held so that the armatures 5, 8 move essentially linearly.
- the ends of the leaf springs 6, 7; 9, 10 are held by means of a holder 11, in which they are clamped.
- the leaf springs 6, 9 and 7, 10 are made in one piece in the embodiment in the region of the holder 11.
- the holder 11 has a shaft 12 which is attached to a frame of a textile machine, for example by means of an arm 13.
- the shaft 12 is clamped between the arm 13 and a clamping element 14 and can thereby be tightened in any axial or radial position. be classified.
- the device according to the invention can be positioned relative to a textile machine in such a way that a thread can be cut or cut.
- the device according to the invention can be arranged in a rapier weaving machine in the direction of the weft thread in a predetermined position relative to the fabric.
- Holding elements 15 are additionally fastened to the holder 11 and carry an electromagnet 16 interacting with the armatures 5 and 8 and a control unit 17.
- the control unit 17 is connected to a control unit of the textile machine via a cable 18.
- the control unit of the textile machine sends signals to the control unit 17 in order to actuate the device 1 according to the invention synchronously with the textile machine.
- an electromagnet 16 which cooperates with an armature 5 or 8 has two mirror-symmetrically arranged iron cores for the armatures 5 and 8, i.e. two iron cores 19 for the armature 5 and two iron cores 20 for the armature 8.
- the iron cores 19, 20 are formed from plates.
- a pair of coils 21 are provided for the iron cores 19, 20, so that both electromagnets 16 are controlled by the same pair of coils 21.
- the coils 21 are each arranged around a central part 22 of the iron cores 19, 20 in the area of the armatures 5, 8.
- the iron cores 19, 20 are fastened to the holding elements 15 by means of screws.
- the iron cores 19, 20 are made in one piece, i.e. they consist of only one set of plates clamped together. As shown in FIG. 1, a housing 23 made of a non-magnetizable material is arranged around the electromagnets 16.
- each electromagnet 16 which cooperates with one of the armatures 5 or 8, is controlled with its own coil.
- two permanent magnets 24, 25 and two permanent magnets 26, 27 are accommodated in the armature 5.
- These permanent magnets 24 to 27 have a rod-like shape and have two poles.
- the north-south direction of the permanent magnets 24 to 27 runs perpendicular to the direction of movement of the armatures 5 and 8.
- the permanent magnets 24, 25 on the one hand and the permanent magnets 26, 27 on the other hand are each arranged in such a way that the non-identical poles adjoin one another.
- Each of the permanent magnets 24 to 27 has a length which corresponds approximately to the size of the movement of the associated armature 5 or 8 between a rest position when the coil is not excited and a position when the coil 21 is excited.
- the permanent magnets 24, 25 are oriented with their poles opposite to the poles of the permanent magnets 26, 27, so that when the coil 21 is excited, the armatures 5, 8 are each moved in the opposite direction. Because of this design, both armatures 5, 8 can be actuated with the same coil 21 or with a coil set 21.
- the blades 2, 3 are in a rest position, in which the coil 21 is not energized.
- the armatures 5, 8 move in the opposite direction to a position which is shown in FIG. 4. This position is called an open position or provision. In this position, the armature 5, 8 and thus the blades 2, 3 against the force of the leaf springs 6, 7; 9, 10 moves.
- the electromagnet 16 and the excitation current for the electromagnet 16 are of course on the strength of the leaf springs 6, 7; 9, 10 matched or the leaf springs 6, 7; 9, 10 are matched to the electromagnets 16 and the excitation current.
- the armatures 5, 8 are pressed apart somewhat, so that the blades 2, 3 are pressed against one another only with little force.
- a thread A to be separated or cut for example a weft thread in a rapier weaving machine, is brought between the blades 2 and 3. This can be done, for example, as described in DE 2230099.
- the armatures 5, 8 are actuated by the force of the prestressed leaf springs 6, 7; 9, 10 moved back from the supply so that they cut the thread A located between the blades 2, 3 in a cutting position, which is shown in FIG. 5.
- the poles of the permanent magnets 24 to 27 of the same name face each other, so that the armatures 5, 8 attract each other, which supports the cutting process.
- the cutting position is somewhat lower than the rest position shown in FIG. 2. This is because the blade 3 moves downward at a higher speed than the blade 2 moves upward.
- This speed difference results in the illustrated embodiment from a difference in the natural frequency between the unit consisting of blade 2, armature 5 and leaf springs 6, 7 and the unit consisting of blade 3, armature 8 and leaf springs 9, 10.
- the difference becomes in the speed of the movement, for example, caused by the fact that the unit with the blade 2 is heavier and thus moves more slowly than the unit with the blade 3.
- it is also possible to change the speed of the movement by changing the natural frequency of the unit in question on to- to achieve them, in particular by changing the mass of the unit or the spring stiffness of the leaf springs 6, 7; 9, 10.
- the coil 21 can also be controlled.
- provision can be made not to interrupt the excitation of the coil 21, but rather to let a relatively small current flow through the coil. In general, however, this is not desirable since the highest possible speed is advantageous in many cases for cutting. Therefore, in order to increase the speed of movement, a current can be passed through the coil 21 that is opposite to the current flowing through the coil 21 to bring the blades 2 and 3 into the condition shown in FIG. 4.
- the blades 2, 3 are also controlled by the electric drive means 4 during their movement from the provision.
- the bobbin 21 is briefly excited after cutting — for example as described above — in order to brake the blades 2, 3.
- the unit can then swing out freely until the rest position according to FIG. 2 has been taken up again. Swinging out is dampened because blades 2, 3 abut and rub.
- the coils 21 can be short-circuited after the separation process.
- the movement of the permanent magnets 24 to 27 generates a voltage which generates a current through the coils 21 when the coils 21 are short-circuited. As a result, part of the kinetic energy in the coils 21 is converted into heat. This can also increase the frequency of the process.
- the control unit 17 of the device according to the invention is connected to a CAN bus system via a cable 18, so that the electrical drive means, in particular the coil 21, can be controlled via this CAN bus system.
- control unit 17 is provided with means for detecting the course of movement of the blades 2, 3 during the movement and in particular the cutting movement. This can be done, for example, by measuring an electrical signal that arises in the coil 21 due to the permanent magnets 24 to 27 of the armatures 5, 8 that move relative to the coil 21.
- the cutting time can be determined on the basis of this signal.
- the cutting time can also be determined in another way, for example with the aid of optical sensors or as is known from WO 99/29946.
- this method can be used, for example, to compare the correct cutting time with the time at which the bobbin 21 is no longer excited.
- the point at which the drive means 4 are no longer excited is synchronized with the weaving cycle by setting the point in time at which the excitation ends within the weaving cycle in such a way that cutting is carried out at the right time within the weaving cycle.
- a correct setting of the time of the end of the excitation can be established for each cutting device without the properties of the leaf springs, the anchors or the blades influencing the synchronization of the cutting time with the weaving cycle.
- Such an adjustment can be implemented, for example, by setting the time at which the excitation of the bobbins 21 ends in relation to the position of the drive shaft of the rapier weaving machine in such a way that the armatures 5 and 8, which are retained in their provision, are attached to it Time to be released.
- the relative timing of the truncation with respect to the timing of the end of the excitation can then be used as a feedback value to adjust the timing of the termination of the excitation relative to the position of the drive shaft of the rapier weaving machine.
- the cutting time can be controlled by the control of the end of the excitation depending on the aforementioned predetermined position with respect to the position of the drive shaft and thus with respect to the Weaving cycle can be set or changed exactly.
- 1, 3 and 6 also show details of how the blades 2 and 3 are connected to the armatures 5 and 8.
- the leaf springs 7 are fastened to the armature by means of a clamping piece 28.
- a T-piece 30 is fastened on this clamping piece 28 by means of a screw.
- the blade 2 is fastened to this T-piece 30 by means of fastening means 31.
- the leaf springs 10 are fastened by means of a clamping piece 29.
- a T-piece 32 is fastened on this clamping piece 29 by means of a screw. Untitled.
- a leaf spring 33 is fastened to this T-piece 32 by means of a fastening means 34.
- this leaf spring 33 is for example by gluing, soldering or welding or the like.
- the blade 3 attached.
- the force with which the blades 2, 3 are pressed against one another can be set by fastening the T-pieces 30 and 32 relative to one another and due to the deformation of the leaf spring 33.
- the relative height of the blades 2 and 3 to one another can also be set by means of the fastening means 31 and 34.
- the blades 2 and 3 are ground in a known manner in order to cut optimally.
- the armatures 5 and 8 each have only one permanent magnet, for example the permanent magnet 25 or 26.
- Different speeds for the movement of the blades 2 and 3 can also be achieved in that the blades 2, 3 are controlled differently during the movement towards the cutting position by means of the electric drive means 4, by using permanent magnets with different strengths for the two armatures 5, 8 are used in that the electromagnets 21 are actuated differently, in that each armature 5, 8 is actuated by its own electromagnet or by a combination of the measures mentioned.
- an auxiliary coil can be provided for each armature 5, 8 in order to accelerate or slow down the movement of the armature 5, 8 during cutting.
- the ready position or ready position is essentially determined by the length dimensions of the permanent magnets 24 to 27.
- this position can be determined using sensors, for example with the help of optical sensors, which cooperate with the control unit 17.
- the control unit 17 can, for example, control the current supplied to the coil 21 in such a way that the armatures 5, 8 assume a predefined provision.
- the device according to the invention is not limited to use in a rapier weaving machine. It can easily be used in any other textile machine in which threads have to be severed, for example in air jet weaving machines, rapier weft weaving machines, water jet weaving machines, projectile weaving machines, other types of weaving machines, knitting machines, sewing machines and other textile machines.
- the device according to the invention has the advantage that it can be easily installed in any existing textile machine.
- a particular advantage is that a thread can be cut at a relatively high cutting speed, which can be set independently of the speed of the textile machine and independently or at least largely independently of the electrical drive means. The fact that both blades 2, 3 move relative to one another during cutting results in a higher cutting speed compared to the case in which one of the blades is stationary.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Combined Means For Separation Of Solids (AREA)
- Push-Button Switches (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE200200357 | 2002-05-31 | ||
BE2002/0357A BE1014859A3 (nl) | 2002-05-31 | 2002-05-31 | Inrichting en werkwijze voor het knippen van een draad. |
PCT/EP2003/005537 WO2003102283A1 (de) | 2002-05-31 | 2003-05-27 | Vorrichtung und verfahren zum trennen eines fadens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1509646A1 true EP1509646A1 (de) | 2005-03-02 |
EP1509646B1 EP1509646B1 (de) | 2008-04-16 |
Family
ID=29588510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03755946A Expired - Lifetime EP1509646B1 (de) | 2002-05-31 | 2003-05-27 | Vorrichtung und verfahren zum trennen eines fadens |
Country Status (8)
Country | Link |
---|---|
US (1) | US20060053602A1 (de) |
EP (1) | EP1509646B1 (de) |
CN (1) | CN1656266B (de) |
AT (1) | ATE392500T1 (de) |
AU (1) | AU2003232833A1 (de) |
BE (1) | BE1014859A3 (de) |
DE (1) | DE50309638D1 (de) |
WO (1) | WO2003102283A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1549794A2 (de) * | 2002-10-10 | 2005-07-06 | Lindauer Dornier Gesellschaft M.B.H | Verfahren zum steuern von komponenten eines arbeitsmittels in webmaschinen und webmaschine zur verfahrensdurchführung |
DE102008027131A1 (de) | 2008-05-30 | 2009-12-03 | Picanol N.V. | Vorrichtung zum Trennen eines Schussfadens |
IT1402740B1 (it) * | 2010-10-19 | 2013-09-18 | Btsr Int Spa | Dispositivo di taglio di un filo tessile durante la sua alimentazione ad un elemento operatore |
CN103485046A (zh) * | 2013-09-16 | 2014-01-01 | 浙江康立自控科技有限公司 | 纺织机械用切纱器 |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH335927A (de) * | 1954-12-10 | 1959-01-31 | Pfaff Ag G M | Fadenabschneideinrichtung an einer Nähmaschine mit einer im Drückerfuss aufgenommenen Nadelfaden-Abschneidvorrichtung und einer unterhalb der Stichplatte angeordneten Unterfaden-Abschneidvorrichtung |
DE1206390B (de) * | 1958-06-13 | 1965-12-09 | Karl Schroeder K G | Locher zum Lochen von Papier, Pappe, Karton od. dgl. |
CH540365A (it) * | 1971-06-21 | 1973-08-15 | Somet Soc Mec Tessile | Dispositivo di taglio dei fili di trama per telai di tessitura |
US3855890A (en) * | 1972-12-20 | 1974-12-24 | Xerox Corp | Slitter/perforator apparatus |
US3854356A (en) * | 1973-07-17 | 1974-12-17 | Amf Inc | Thread cutting and clamping means |
CH562672A5 (de) * | 1973-08-14 | 1975-06-13 | Apag Apparatebau Ag | |
CH568134A5 (de) * | 1974-02-20 | 1975-10-31 | Zellweger Uster Ag | |
US3998118A (en) * | 1974-11-08 | 1976-12-21 | Royal Business Machines, Inc. | Roll fed copier |
US4444174A (en) * | 1982-01-18 | 1984-04-24 | Plas Plugs Limited | Tile parting devices |
JPS60110480A (ja) * | 1983-11-21 | 1985-06-15 | Kanzaki Paper Mfg Co Ltd | カツタ−付きラベルプリンタ |
GB8403440D0 (en) * | 1984-02-09 | 1984-03-14 | British Telecomm | Cleaving apparatus |
JPH05163622A (ja) * | 1991-12-17 | 1993-06-29 | Teijin Seiki Co Ltd | 糸の切断方法および切断装置 |
CA2139980A1 (en) * | 1994-01-13 | 1995-07-14 | David Demarest | Suture cutting system |
CN2200653Y (zh) * | 1994-05-04 | 1995-06-14 | 黄耀 | 缝纫机的自动送料及裁断装置 |
IT1269801B (it) * | 1994-05-20 | 1997-04-15 | Nuovo Pignone Spa | Tagliatrama perfezionato per telaio ad aria |
JPH09224316A (ja) * | 1996-02-16 | 1997-08-26 | Yazaki Corp | 電線皮剥き装置及び電線皮剥き方法 |
JP3659525B2 (ja) * | 1996-02-16 | 2005-06-15 | アルフレッサファーマ株式会社 | 針付縫合糸の製造装置 |
US5911807A (en) * | 1996-09-27 | 1999-06-15 | Markem Corporation | Apparatus for cutting a continuously flowing material web |
EP1090726B1 (de) * | 1999-01-11 | 2004-06-16 | Beldex Corporation | Ritzwerkzeug |
US6536121B1 (en) * | 1999-08-06 | 2003-03-25 | Thk Co., Ltd. | Scribing apparatus |
US20030033922A1 (en) * | 2001-08-14 | 2003-02-20 | Scott Larry S. | Cutter assembly and housing |
-
2002
- 2002-05-31 BE BE2002/0357A patent/BE1014859A3/nl not_active IP Right Cessation
-
2003
- 2003-05-27 CN CN03812453.XA patent/CN1656266B/zh not_active Expired - Fee Related
- 2003-05-27 DE DE50309638T patent/DE50309638D1/de not_active Expired - Lifetime
- 2003-05-27 EP EP03755946A patent/EP1509646B1/de not_active Expired - Lifetime
- 2003-05-27 US US10/514,554 patent/US20060053602A1/en not_active Abandoned
- 2003-05-27 WO PCT/EP2003/005537 patent/WO2003102283A1/de active IP Right Grant
- 2003-05-27 AU AU2003232833A patent/AU2003232833A1/en not_active Abandoned
- 2003-05-27 AT AT03755946T patent/ATE392500T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO03102283A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50309638D1 (de) | 2008-05-29 |
WO2003102283A1 (de) | 2003-12-11 |
CN1656266B (zh) | 2010-11-03 |
BE1014859A3 (nl) | 2004-05-04 |
ATE392500T1 (de) | 2008-05-15 |
EP1509646B1 (de) | 2008-04-16 |
AU2003232833A1 (en) | 2003-12-19 |
US20060053602A1 (en) | 2006-03-16 |
CN1656266A (zh) | 2005-08-17 |
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Legal Events
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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 |
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17P | Request for examination filed |
Effective date: 20041026 |
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