EP0860529B1 - Module de commande pour commander les aiguilles d'un métier à tricoter - Google Patents
Module de commande pour commander les aiguilles d'un métier à tricoter Download PDFInfo
- Publication number
- EP0860529B1 EP0860529B1 EP98102296A EP98102296A EP0860529B1 EP 0860529 B1 EP0860529 B1 EP 0860529B1 EP 98102296 A EP98102296 A EP 98102296A EP 98102296 A EP98102296 A EP 98102296A EP 0860529 B1 EP0860529 B1 EP 0860529B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control module
- bending transducer
- bending
- module according
- active layer
- 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.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
- D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
- D04B15/78—Electrical devices
Definitions
- the invention relates to a control module for controlling the needles a knitting or knitting machine with a housing and at least one piezoelectric bending transducer arranged therein, wherein the bending transducer comprises a flat support body, which is at least on one side with a piezoelectric active layer and at a rear end is firmly connected to the housing.
- Such a control module is suitable for controlling the needles or stitch-forming elements of a textile machine, such as a knitting or knitting machine. This is particularly suitable Control module for use on a jacquard machine.
- to Pattern formation in the goods produced by a textile machine becomes the information whether a needle is forming a stitch is used or not, via a mechanical Obtained scan of the deflection of the bending transducer. Dependent a mesh is formed from the deflection of the bending transducer or not.
- a control module is known from US 3,961,501 A, at which the movable end or front end of the piezoelectric Bending converter with a guide part through which is assigned a for the elevation of each needle Part of a knitting machine depending on the passing from the deflection of the bending transducer to an operative position is pressed or not.
- the operative position is the stroke of a corresponding cam with the help of the uplifted part, for which also the technical term Circuit board is used on the appropriate needle transfer.
- every single needle of the Knitting machine can be controlled separately.
- the positioning speed of known bending transducers is sufficient not out of a theoretically possible knitting speed to reach.
- control module described in US 3,961,501 A is in similarly also known from EP 0 210 790 A2. Also here a number of bending transducers are combined in the control module, to control the working speed of the Increase textile machine.
- Such a control module is also from DE 39 33 149 C2 known.
- the bending transducer is at a rear end movably connected to the housing and additionally on one Center area rotatably supported. Through this between the ends of the bending transducer lying area is a reduction the response time of the bending transducer.
- a bending transducer must have a certain minimum length exhibit.
- Such a bending transducer must also be possible be wide and less than Have 200 microns. This is the only way to get one Achieve high electrical capacity of the bending transducer, so that with a normal operating voltage of approx. 50 V one can achieve sufficiently high deflection of the bending transducer.
- the housing of the control module must have a corresponding Have length, resulting in a control module with large dimensions leads. Furthermore, can be stored with such Bending converter only positioning or response times of no less than 2.5 milliseconds (msec.). The Working speed one with such a control module Equipped textile machine is still by the response time of the bending transducer limited.
- the object of the invention is to provide a control module based Specify piezoelectric bending transducer, which is a superior Has property in terms of response time.
- a control module to control the needles of a knitting or knitting machine, with a housing and at least one arranged therein piezoelectric bending transducer
- the bending transducer one includes flat support body, which at least on one side provided with a piezoelectrically active layer and on its rear end is fixed to the housing, wherein the ratio of the free length of the bending transducer to its Thickness ranges from 40 to 70.
- the free length of the bending transducer becomes the distance between the front, freely movable end and the location of the fixed connection to the housing at the rear end of the bending transducer Roger that.
- the invention does not take the path according to the opinion a relevant expert a bending transducer with high electrical capacity and resulting proportionately great length and width for a control module with high Response time to use. Rather, the invention proceeds from considering that the response time of a bending transducer largely determined by its mechanical vibration behavior becomes.
- the natural or resonant frequency of the bending transducer a significant factor. The higher the resonant frequency is, the easier a low one can be Response time can be achieved.
- Do extensive research show that with a bending transducer, in which the Ratio of its free length to its thickness in an area is between 40 and 70, resonance frequencies of more than 150 Hz. Bending transducers common until now however, have a ratio of length to thickness in one Range from 100 to 140, which results in resonance frequencies of not more than 100 Hz.
- response times of less than 2.5 msec can be based on the resonance frequency. achieve. Such response times are required, for example, to control the needles of a circular knitting machine in accordance with the maximum possible rotation speed of the knitting cylinder.
- a control module on the basis of such bending transducers, a productivity increase of a knitting machine, ie knitted goods in m 2 per unit time, can be achieved by approximately 50% compared to control modules which are equipped with conventional bending transducers.
- Conventional bending transducers only achieve response times of not less than 2.5 msec.
- the bending transducer is used to control the needles by applying a voltage or a potential difference of more than 100 V to the electrodes of the piezoelectric active layer, for example electrodes in the form of a Metallization, is actuated.
- a voltage or a potential difference of more than 100 V to the electrodes of the piezoelectric active layer, for example electrodes in the form of a Metallization.
- the support body be electrically conductive and as such an electrode Act.
- a flat electrode can have one, for example the piezoelectrically active layer applied metallization or a coating made of a conductive plastic his. The application of the potential difference or voltage can via connecting cables contacted with the corresponding electrodes happen.
- the piezoelectrically active layer all materials are suitable, which the piezoelectric or show the electrostrictive effect, it's special advantageous if the piezoelectrically active layer Piezoceramic is.
- a piezoceramic allows namely through their composition an adaptation to different Requirements, for example with regard to the coefficient of thermal expansion, the size of the piezoelectric effect or in terms of flexibility become.
- certain oxide ceramics e.g. on the base of lead zirconate titanium known, which excellent Have properties.
- the piezoelectric Effect shows is a polarization of the same in one homogeneous electric field of a few KV / mm required.
- a polar axis in the piezoceramic generated for the occurrence of the piezoelectric effect necessary is.
- the polar axis which in the direction of the shows the electric field used for polarization defines the so-called polarization direction of the piezoceramic.
- An increase in the deflection path of the bending transducer can be achieve if the bending transducer with a piezoelectrically active layer is provided. From the rest position of the bending transducer can be alternately Apply a potential difference to both piezoelectrically active ones Layers achieve a deflection on both sides and thus the deflection path compared to a one-sided coating Double the bending transducer.
- a piezoceramic Bending converter can be used to control the needles of the bending converter by applying a potential difference of more than 100 V.
- one of the piezoceramic layers is actuated, the electric field in the direction of polarization of the respective piezoceramic layer shows and each potential difference present at the other piezoceramic layer is zero.
- You can do this between the two outer ones Electrodes of the bending transducer a fixed predetermined potential difference be created and the supporting body or possibly itself between the support body and the respective piezoceramic Alternating internal electrodes switched to the respective potential of the outer electrodes become.
- the thickness of the bending transducer is advantageously in one Range from 500 to 900 ⁇ m. With such a thickness with a sufficiently high electrical capacity high mechanical resonance frequency and thus a low response time of the bending transducer. The free length of a such bending transducer can be reduced to 25 mm.
- the width of the bending transducer it is advantageous if this is in a range of 2 to 10 mm.
- a high flexibility and a high response time of the bending transducer can be achieved if the support body from a Fiber composite material exists.
- a fiber composite is, for example, a carbon or glass fiber reinforced Epoxy resin, depending on whether it is an electrically conductive or an electrically non-conductive support body is desired is.
- all other are fiber-reinforced Plastics imaginable as long as they are the required Have flexibility.
- control module provides for the control electronics on an electronic board to arrange and the rear end of the bending transducer on the Fasten the electronics board. This way a compact housing with small dimensions for the control module achieve.
- FIG. 1 is an advantageous embodiment in supervision of the control module according to the invention for use in a Jacquard circular knitting machine shown.
- a housing 1 In a housing 1 are 16 piezoelectric bending transducers 2 each with the same distance from each other and arranged parallel to each other. An upper housing part is not for reasons of clarity located.
- Each of the 16 piezoelectric bending transducers 2 is using a groove in a terminal block 6 on the respective rear end 5 firmly connected to the housing 1.
- Every bending transducer 2 is constructed from an electrically conductive Support body 3 in the form of a flat plate made of a carbon fiber reinforced Epoxy resin, which support body 3 on both sides each provided with a piezoelectrically active layer 4 is.
- the piezoelectrically active layer 4 is as one Lead-zirconate-titanium oxide ceramics designed so that the supporting body 3 and the respective piezoelectrically active layer 4 one almost identical in wide temperature ranges Have coefficients of thermal expansion.
- the surface of the piezoelectrically active layer 4 is for electrical contacting each with an electrode in the form of a thin one Provide metallization layer.
- Each bending transducer 2 is approximate along the entire length with an electrically insulating Surface coating provided for a light Achieve manageability. Only at the rear end 5 are the support body 3 and the two piezoelectric active layers 4 led to the outside, so that there easily control electronics can be connected.
- the electrical Contacting and wiring of the bending transducers 2 is shown in detail in Figures 3 and 4.
- each bending transducer 2 On the front, freely movable end 8 of each bending transducer 2 a cylindrical thickening 14 is clamped.
- the thickening 14 reaches into the rear part of one with the help of a Axis 12 on the housing 1 rotatably mounted rocker 10, the front End is formed as an elongated finger.
- the control module is used to control the needles Bore 20 in a vertical position, i.e. with one another piezoelectric bending transducers 2 attached.
- the corresponding board which has a hub on the assigned Knitting needle transfers, brought into an operative position or not.
- the corresponding circuit board is used for this the knitting cylinder in the appropriate place with a Provide cams so that when the Control module one cam or one board exactly one is assigned to piezoelectric bending transducer 2.
- Corresponding the operational position is a hub on the assigned Transfer knitting needle, which then results in a stitch formation is used.
- one of the rockers 10 kicks the cam of the associated one Do not use your finger to slide the board over Rocker 10 in contact, so that the board is not in the operational position. Accordingly, no stroke is opened transfer the associated knitting needle and consequently also not used to form a stitch.
- control electronics via connecting cables, connecting terminals or other electrical contacts with the piezoelectric bending transducers 2 connected.
- the control electronics can be attached to the housing 1 of the control module or with a corresponding length of the connecting cable attached to another part of the knitting machine become.
- FIG 2 is a particularly advantageous embodiment in supervision of the control module according to the invention shown.
- the structure corresponds essentially to the control module, which in Figure 1 is shown.
- the piezoelectric bending transducers 2 were compared by approximately 1/3 the bending transducers in Figure 1 shortened.
- control electronics 20 can function integrate the housing 1.
- Control electronics 20 and control module are compact in this way in a single housing 1 accommodated.
- Such a construction has the advantage that the electrical Connection cable between the control electronics 20 and the Bending transducers 2 can be kept very short, so that too Voltage pulses with high frequency applied to the bending transducer 2 can be.
- the control electronics 20 itself is on an electronics board 21 housed. Are symbolic corresponding to this in Figure 2 without further details electronic components 22 shown.
- Terminal block 6 For fixing of the respective rear end 5 of the bending transducer 2 is Terminal block 6 attached directly to the electronics board 21.
- the electronics board 21 itself is with the housing 1, here not shown, screwed.
- the detailed structure and the electrical contact a bending transducer 2 according to Figures 1 and 2 is based a perspective view shown in Figure 3. Out For reasons of clarity, this is the electrically insulating one Coating of the bending transducer 2 not shown.
- the bending transducer 2 is fixed at its rear end 5 in one Nut of the terminal block 6 clamped.
- the freely movable front end of the Bending transducer 2 movable over a cylindrical thickening 14 connected to a rocker 10, which via an axis 12 is rotatably attached to the housing 1.
- the one for the control module to control the needles of a circular knitting machine provided bending transducer 2 has a thickness 31 of 750 microns and a width 32 of 7 mm.
- the free length 30 measured from free end of the bending transducer up to its rear fastening point of the bending transducer is 38 mm, so the ratio the free length 30 of the bending transducer 2 to his Thickness 31 is 50.
- the support body 3 is, as already described on both sides with a piezoelectrically active Provide a layer made of a lead zirconate titanium oxide ceramic. There is a thin metallization on both sides for electrical contacting 7 on the respective piezoelectrically active Layer 4 applied. Both the support body 3 and the extend piezoelectrically active layer 4 applied on both sides facing away from the free end of the bending transducer Side to behind the terminal block 6.
- the support body 3 For electrical Contacting extends the support body 3 from a carbon fiber reinforced Epoxy over the length of the piezoelectric active layer 4.
- For electrical contacting are the support body 3 and the outer electrode acting metallization 7 of the respective piezoelectrically active Layer 4 via a solder contact 34 each with connecting cables 32 provided.
- the bending transducer 2 is with a so-called Provide three-pole connection.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Claims (10)
- Module de commande pour commander les aiguilles d'une machine à tricoter ou d'un métier à mailler, comprenant un boítier (1) et au moins un transformateur de flexion (2) piézoélectrique qui y est placé, le transformateur de flexion (2) comprenant un support (3) plat qui est muni au moins sur un côté d'une couche piézoélectrique active (4) et qui est relié solidement au boítier (1) sur son extrémité arrière (5),
caractérisé en ce que le rapport de la longueur libre (30) du transformateur de flexion (2) à son épaisseur (31) est compris entre 40 et 70. - Module de commande selon la revendication 1 caractérisé en ce que, pour commander les aiguilles, le transformateur de flexion (2) peut être actionné en appliquant une tension de plus de 100 V sur les électrodes de la couche active piézoélectrique (4).
- Module de commande selon la revendication 2 caractérisé en ce que la couche active piézoélectrique (4) est une piézocéramique et que le champ électrique obtenu en appliquant une tension est orienté en direction de polarisation (36) de la piézocéramique.
- Module de commande selon l'une des revendications 1 à 3 caractérisé en ce que le transformateur de flexion (2) est muni des deux côtés d'une couche active piézoélectrique (4).
- Module de commande selon l'une des revendications 1 à 4 caractérisé en ce que l'épaisseur (31) du transformateur de flexion (2) est comprise entre 500 et 900 µm.
- Module de commande selon l'une des revendications 1 à 5 caractérisé en ce que la largeur (32) du transformateur de flexion (2) est comprise entre 2 et 10 mm.
- Module de commande selon l'une des revendications 1 à 6 caractérisé en ce que le support (3) est en un matériau composite en fibres.
- Module de commande selon l'une des revendications 1 à 7 caractérisé en ce qu'un système électronique de commande (20) destiné à actionner le transformateur de flexion (2) est placé dans le boítier (1).
- Module de commande selon la revendication 8 caractérisé en ce que le système électronique de commande (20) est placé sur une platine électronique (21) et que l'extrémité arrière (5) du transformateur de flexion (2) est fixée à la platine électronique (21).
- Module de commande selon l'une des revendications 1 à 9 caractérisé en ce que l'on prévoit plusieurs transformateurs de flexion (2) placés parallèlement les uns aux autres.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19706755A DE19706755A1 (de) | 1997-02-20 | 1997-02-20 | Steuermodul zur Steuerung der Nadeln einer Textilmaschine |
DE19706755 | 1997-02-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0860529A2 EP0860529A2 (fr) | 1998-08-26 |
EP0860529A3 EP0860529A3 (fr) | 2000-03-22 |
EP0860529B1 true EP0860529B1 (fr) | 2003-05-02 |
Family
ID=7820956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98102296A Expired - Lifetime EP0860529B1 (fr) | 1997-02-20 | 1998-02-10 | Module de commande pour commander les aiguilles d'un métier à tricoter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0860529B1 (fr) |
JP (1) | JPH10245752A (fr) |
AT (1) | ATE239115T1 (fr) |
DE (2) | DE19706755A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1304701B1 (it) * | 1998-12-11 | 2001-03-28 | Vamatex Nuova Spa | Attuatore ad effetto piezoelettrico in particolare per l'applicazionenelle macchine tessili |
DE19919543C1 (de) * | 1999-04-29 | 2001-01-11 | Siemens Ag | Verfahren und Vorrichtung zur Funktionsprüfung von Biegewandlern, bevorzugt in Textilmaschinen |
DE10324663A1 (de) * | 2003-05-30 | 2004-12-30 | Siemens Ag | Vorrichtung und Verfahren zur drehzahlabhängigen Ansteuerung von Aktuatoren |
DE102007041636A1 (de) * | 2007-09-03 | 2009-03-05 | Argillon Gmbh | Biegewandlerelement sowie Biegewandlermodul |
JP5173644B2 (ja) * | 2008-07-25 | 2013-04-03 | ワックデータサービス株式会社 | 繊維機械用圧電アクチュエータ素子およびその製造方法 |
CN102154777A (zh) * | 2011-05-16 | 2011-08-17 | 江苏亿隆新能源科技发展有限公司 | 压电陶瓷选针器驱动片 |
CN102691165A (zh) * | 2012-06-18 | 2012-09-26 | 芮国林 | 电极位于压电陶瓷片同一面上的压电陶瓷驱动片 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2316794A1 (de) * | 1973-04-04 | 1974-10-17 | Mayer & Cie Maschinenfabrik | Strickmaschine mit mustereinrichtung |
JPS6228451A (ja) * | 1985-07-24 | 1987-02-06 | 渡辺靴下工業株式会社 | 編機用選針装置 |
JPH0694619B2 (ja) * | 1988-10-05 | 1994-11-24 | ワツクデータサービス株式会社 | 編機用選針装置 |
DE4442555C2 (de) * | 1994-11-30 | 1997-03-13 | Mayer Textilmaschf | Kettenwirkmaschine |
DE19635929A1 (de) * | 1995-09-29 | 1997-07-10 | Siemens Ag | Piezoelektrischer Biegewandler mit einer Trägerschicht |
-
1997
- 1997-02-20 DE DE19706755A patent/DE19706755A1/de not_active Ceased
-
1998
- 1998-02-10 DE DE59808110T patent/DE59808110D1/de not_active Expired - Lifetime
- 1998-02-10 EP EP98102296A patent/EP0860529B1/fr not_active Expired - Lifetime
- 1998-02-10 AT AT98102296T patent/ATE239115T1/de not_active IP Right Cessation
- 1998-02-20 JP JP10055805A patent/JPH10245752A/ja not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
EP0860529A3 (fr) | 2000-03-22 |
DE59808110D1 (de) | 2003-06-05 |
EP0860529A2 (fr) | 1998-08-26 |
ATE239115T1 (de) | 2003-05-15 |
DE19706755A1 (de) | 1998-08-27 |
JPH10245752A (ja) | 1998-09-14 |
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