EP3139391A1 - Actuator for textile guide-needles - Google Patents

Abstract

Actuator arrangement for adjusting a laying needle of a textile machine or for moving another Verstellobjektes, with at least two variable transducers, which are arranged on opposite sides for coupling with the Verstellobjekt and actuated by electrical control, wherein the variable converter each designed as an electromagnetic variable converter and for generating a arranged magnetic field are arranged so that in their electrical control and actuation, a magnetic tensile force on the Verstellobjekt is exercisable.

Description

The invention relates to an actuator arrangement for adjusting a guide needle of a textile machine or for moving another Verstellobjektes with at least two actuators, which are arranged on opposite sides for coupling with the Verstellobjekt and actuated by electrical control. Furthermore, the invention relates to a method for moving or adjusting a guide needle of a textile machine or other Verstellobjektes in particular using said actuator arrangement, wherein two variable transducers are arranged on both sides of the Verstellobjektes and set in operative connection with this by respective electrical control. The adjustment or movement of the guide needle or other Verstellobjektes in the invention comprises both rotational movements such as pivoting about an axis or bending movements about an attachment point and linear or otherwise translational movements, for example, predetermined by a guide sliding movements.

Textile machines are known in the form of warp knitting machines with Jaquard control, in which several guide needles are divided on guide bars and due to electrical control commands individually and selectively displaceable or adjustable by at least one knitting needle division ( EP 0 583 631 B1 ). In order to simplify the Jaquard control, it is proposed to adjust the guide needles by means of piezoelectric transducers arranged on the guide bar and each associated with a guide needle, for which purpose a control voltage is applied to the piezoelectric transducers. Since piezoelectric transducers are relatively small components, a space-saving, the tight knitting needle division bill carrying installation can be achieved for the realized bending or variable converter, with a travel is achieved according to the knitting needle. Another advantage is the low power dissipation with which piezoelectric transducers can work.

A disadvantage of piezoelectric transducers is the low actuating force, which can be applied with them (see EP 2 053 149 A2 , Column 2, lines 46 and 47). This can lead to so-called "bounce" or rebound effects when the guide needle strikes a stop, which serves to limit the laying needle adjustment stroke. In order to reduce such vibrations when hitting the laying needle on the stop, it is after the above EP 0 583 631 B1 considered expedient to provide the guide needle stop with a permanent magnet.

In order to meet the high requirements on dynamic response in Jaquard devices and to avoid the mentioned disadvantages associated with piezoelectric transducers, is in EP 2 053 149 A2 proposed to provide an electropneumatic-mechanical adjusting device, which is set in operative connection with an actuator for displacing the guide needles and their leadership. However, the constructive implementation of the electropneumatic-mechanical concept leads, in view of the very limited space available for the individual components of the actuator to a complex construction with a variety of components, which in turn impairs the technical reliability.

It is the task underlying the invention to provide a comparison with the disadvantages of the prior art improved actuator device for textile machine guide needles or other Verstellobjekten. To solve the specified in claim 1 actuator assembly and specified in the independent claim 16 movement or adjustment method for guide needles or other Verstellojekte proposed. Optional, expedient invention training emerge from the dependent claims.

According to the invention, both sides of the Verstellobjektes, in particular the textile machine needle, each a magnetic field generator to form a magnetic traction, in particular one Elektrozugmagnet used to the Verstellobjekt or the guide needle linear and / or rotational, in particular bending strokes within predetermined dead centers or to issue attacks. In this case, an actuator arrangement with two electromagnetic transducers or Elektrozugmagneten is provided per Verstellobjekt. On the basis of the invention, electromagnetic variable converter, the adjustment movements with the necessary force and Perform dynamics. In this regard, an embodiment of the ferromagnetic or magnetizable material displacement object and its arrangement is operative between the two electromagnetic variable transducers, with a magnetic air gap formed between the displacement object and each of the electronically and / or electrically operated variable transducers, and that of the respective electromagnetic variable converter generated magnetic field for exerting a tensile force on the Verstellobjekt is aligned.

By means of the actuator arrangement according to the invention as a basic unit, it is also possible to realize a module with a plurality of adjoining guide needles which can each be adjusted by an actuator basic unit according to the invention.

The available space for the individual components of the actuator arrangement is very limited or narrow, especially in connection with textile machine guide needles. This is borne out by an optional invention training, according to which the electromagnetic actuator or Elektrozugmagnet comprises a printed circuit with coil, in particular non-conductive substrate or substrate (for example, plastic circuit board) with interconnects, hereinafter referred to as "PCB coil". In this case, one or more printed circuit boards, in particular copper tracks, are formed on one or more circuit boards, the course of which corresponds to an inductor or a coil for generating a magnetic field with a magnetic tensile force.

To achieve high tensile forces and associated high dynamic range, it is particularly advantageous to form the PCB coil in multilayer technology. In this case, the coil or its windings extends over several layers or over a plurality of superimposed and conductor tracks bearing planes. The advantage thus achieved consists mainly in the feasibility of higher numbers of turns for the PCB coil, which is accompanied by a corresponding increase in the magnetic tensile force. From practice-oriented design calculations it follows that in a board with 2 copper layers, a number of turns of the PCB coil of 10 and a board with 4 copper layers one Number of turns of the PCB coil of 20 is possible. With a guidewire width of 9 mm, a number of turns of 20 or 40 and with a guidewire width of 12 mm, a number of turns of 30 or 60 is conceivable.

In order to avoid, in the case of a module with a plurality of adjacent guide needles, that an electromagnetic transducer with its magnetic flux leakage affects a neighboring, another or adjacent electromagnetic transducer associated guide needle functionally impairing, according to an optional invention training the PCB coil or other electromagnetic Actuator with an iron or otherwise ferromagnetic body for magnetic inference put into operative connection. The advantage consists in a targeted bundling and guidance of the magnetic field lines, whereby little scattering losses arise. The return body can be made for example with sheet metal. According to an expedient embodiment, the PCB coil in order to prevent repercussions on adjacent, her unassigned guide needles or adjacent, other Verstellobjekten over its entire width or at least with a complete page on the return body placed in a preferably planar contact and secured there. The attachment can be done for example by sticking.

The stray magnetic flux, which could possibly inappropriately spread to neighboring Verstellojekte, can be further reduced if the PCB coil from the magnetic return body, preferably as far as possible, includes or surrounded or embedded in it with the proviso that even magnetic tensile forces on the adjustment object can be exercised to the required extent. This can be realized by the fact that the PCB coil not only with a longitudinal, broad or back, but also with its front or thickness sides rests full-flat on the yoke body. The targeted conduction of magnetic field lines while avoiding leakage flux is thereby further improved, and the magnetic tensile force on the Verstellobjekt reinforced. The latter is also an exemplary invention training, according to which one or more circuit boards of the PCB coil a recess or a Have breakthrough which or which is filled or interspersed by material of the ferromagnetic yoke body.

The achievement of higher tensile forces is also an optional invention training, according to which the return body is designed with a groove, groove or other recess on its surface, in which a PCB coil can be inserted. For this purpose, the course of the depression can be adapted to the contour of the PCB coil, in particular to cover positively with the PCB coil. It is expedient if the ferromagnetic yoke body, which optionally carries in a guide bar module with a plurality of guide needles on its two opposite sides each a PCB coil to which or according to the thickness of a PCB board is made thicker. Then, a groove can be impressed into the surface of the return body whose depth coincides with or corresponds to that of the board thickness of the PCB coil. The ferromagnetic return volume is thereby further increased and the occurrence further reduces magnetic leakage losses.

The mechanical stabilization is used when optional support means of non-ferromagnetic, non-magnetizable or at least only negligibly magnetizable, but thermally conductive material is used, to which the electromagnetic variable converter, in particular the PCB coil, and / or optionally mounted the ferromagnetic yoke body are. As a result, it is also possible to achieve or promote a dissipation of power loss or heat, in particular if the components mentioned lie flush against the support device. To realize a negligible magnetizability and the thermal conductivity is suitable as a manufacturing material for the support device or parts thereof, for example, aluminum and / or zinc.

In the context of embodiments according to the invention, the structuring of the carrying device into a base plate on which the electromagnetic transducers or PCB coils and / or the return body (s) are placed or applied with one side is expedient, and in a module carrier strip on which the PCB Coils or Electromagnetic transducer and / or the return body or bodies are mounted and / or supported with a different side. In particular, this embodiment has the advantage that the textile machine guide needle can be detachably held on the above-mentioned carrying device, in particular its module carrier strip. Thus, the actuator assembly according to the invention could first be supplied without laying needle to the operator of the textile machine and installed on the textile machine; The guide needles could then be mounted by the operator to the module support bar after installation of the actuator assembly, for example, be releasably supported.

An advantage which can be achieved with the heat-conducting base plate or module carrier strip is that the ferromagnetic return body can be attached, in particular attached or attached, over at least the largest part of its overall length, preferably in a flat-fitting manner. In addition to the improved heat dissipation as well as a mechanical stiffening is achieved, especially when the base plate and the module support bar are firmly connected together or integrally formed.

To control the energization of the electromagnetic transducer, in particular the PCB coil, and also to control their consumption of electrical power, the use of at least one electrical switching element in the coil circuit is appropriate. This also creates a simple way to timely actuation of the converter. The switching element can be accommodated to save space or within the support device, in particular within the base plate or module support bar.

An optional embodiment of the method according to the invention consists in that the adjusting object is given a stroke or a movement or adjustment up to a stop by energizing one of the electromagnetic variable transformers with a higher current intensity; for stable holding the Verstellobjektes the stop at shock then sufficient then a current with a lower current. Among other things, this results from the minimal air gap in the case of abutment with the stop, in the case of larger ones Suit forces are possible. In the context of the invention, it is expedient to carry out the electrical control of the plurality of electromagnetic torque converter or the generation of their magnetic tensile forces alternately with each other so that a defined adjustment can be done by one of the converter alone without influence of the other transducer with the highest possible dynamics.

• Figur 1 in perspektivischer Darstellung eine schematische Prinzipskizze eines Legenadel-Moduls mit einer Mehrzahl von nebeneinander angeordneten Legenadeln mit jeweils zugeordneten Paaren elektromagnetischer Wandler, und
• Figur 2 eine vereinfachte Schnittdarstellung gemäß Linie A-A in Figur 1.

Further details, features, combinations of features, advantages and effects on the basis of the invention will become apparent from the following description of a preferred embodiment of the invention and the drawings. These show in:

• FIG. 1 in perspective view a schematic schematic diagram of a guide needle module with a plurality of juxtaposed guide needles each having associated pairs of electromagnetic transducers, and
• FIG. 2 a simplified sectional view along the line AA in FIG. 1 ,

LIST OF REFERENCE NUMBERS

1

- Module carrier strip

2

- Leader needle

3

- Iron backrest bar

4

- Module carrier base plate

5

- PCB coil

6

- Copper railway

7

- Switch

8th

- Inner recess of the PCB coil

a

- distance

L

- Air gap

9

- stop body

10

- groove in the iron backbone body

According to FIG. 1 are on a module-carrier strip 1, projecting parallel to each other, several textile machine guide needles 2 with its respective end firmly attached. At their other, free ends of the guide needles 2 are provided with (not shown) thread guide elements and can be there from a stop body to another stop body (see FIG. 2 ) when a magnetically generated tensile force is applied thereto by a respective electromagnetic transducer. This leads to bending movements of the fixing needle 2 fixed at one end.

One each a needle 2 opposite, ferromagnetic iron backsets 3 are applied in a parallel arrangement on a thermally conductive, non-ferromagnetic module support base plate 4 heat transfer over its entire length and connected with its one end face to the module support bar 1 physically or thermally conductive, according to exemplary drawing, the module carrier strip 1 is placed vertically on the base plate 4. Between each two iron yoke strips 3, running parallel to them, the respective guide needle 2 back and arranged herbiegbar. The composite of carrier strip 1 and base plate 4 comprehensive support device 1.4 together with the associated, parallel guide needles 2 and iron yoke strips 3 represents a guide needle module.

To adjust the guide needles 2 as bending elements, the iron yoke strips 3 are provided on their sides facing the guide needles each with a PCB coil 5, so that each of the iron yoke strips 3 on both sides wear a PCB coil 5. Of the latter, only the multi-layered (for illustrative simplification) (according to example in FIG. 1 two-layered) running in turns, an inductance or coil forming, conductive copper tracks 6 drawn schematically. A two- or multi-layer board forms together with the running in turns copper tracks 6, the PCB coil 5. By means of a respective PCB coil 5 associated switch 7, the associated copper tracks 6 and turns are switched off or energized. In the current-carrying state goes from the currently switched PCB coil 5 on the assigned, directly opposing guide needle 2 aligned magnetic field, resulting in a force exerted on the ferromagnetic guide needle 2 traction results. The latter displaces or pivots the guide needle 2 as a firmly clamped at the end bending beam, with their free, thread-leading end towards a stop (see FIG. 2 ) is adjusted. In the guide needle module according to FIG. 1 let the individual guide needles 2 adjusted independently of each other, since the respective associated PCB coils 5 by means of the switch 7 are independently operable.

In the sectional view according to FIG. 2 are only schematically drawn from the PCB coils 5, the respective two- or multilayer boards. They each have an inner recess 8, which is filled with material of the respective iron yoke 3 for further reinforcement of the magnetic field generated by the coil turns. To isolate the copper tracks with respect to the iron yoke strips 3 can be applied to the respective PCB coil 5 Abdecklack. Preferably, the respective PCB coil 5 is fixed with its board body to the adjoining iron yoke 3 by gluing.

After the present sectional view of FIG. 2 are the PCB coils 5 over the largest part of its inner and / or outer periphery, in the example shown on at least three sides, of the iron yoke 3 includes or framed. It is desirable that the respective PCB coil is embedded or embedded in the iron backrest strip so that only its side of the guide needle 2 or the Verstellobjekt associated side remains free, so as not to interfere with the exercise of the magnetic tensile force on the guide needle 2. This can be realized for example with a groove 10, which is formed in the iron yoke 3 in the surface of the needle 2 facing the side facing. For this purpose, it is expedient if the iron backrest strip 3 has correspondingly more thickness, for example by being extended by one or both sides by the thickness of the PCB coil 5. The magnetic flux leakage and thus the reaction to adjacent PCB coils and guide needles can be noticeably reduced. This effect is further promoted by having a certain distance a from an outside of the PCB coil 5 is created to a nearest outer edge of the iron yoke. Accordingly, the PCB coil 5 is positioned in the respective iron yoke 3 inwards.

According to FIG. 2 there is a (variable by adjusting) air gap L between the iron yoke 3 and the PCB coil 5 on the one hand and the guide needle 2 on the other. The air gap L receives its minimum width when the free, a thread guide elements having end of the guide needle 2 is placed in abutment against a stop member 9 by a force exerted by a PCB coil 5 tensile force. The latter can be arranged, for example, at a distance from the closest PCB coil 5 or iron back-up strip 3.

With the actuator arrangement according to the invention, in particular with the according to in FIGS. 1 and 2 shown embodiment, magnetic tensile forces can be achieved, which allow very dynamic movements with the advantage that when planting the needle 2 to the stop body 9 due to the then smaller, minimized air gap L larger tightening forces are possible, which secure the system despite any vibration of the laying needle module , The inductance and the ohmic resistance of the PCB coils 5 give the dynamics of the current time constants in the microsecond range. After the short stroke movement of the needle 2 up to the contact with the stopper body 9, the power requirement can be reduced. Because the magnetic tensile force is inversely proportional to the air gap, so that the power requirement for holding the guide needle 2 is reduced to the stopper body 9.

If the current is controlled accordingly, the average power requirement per actuator or torque converter can be reduced. The resolvers or PCB coils 5 are operated with direct current.

Claims (16)

Actuator arrangement for adjusting a guide needle (2) of a textile machine or for moving another Verstellobjektes, with at least two variable transducers, which are arranged on opposite sides for coupling with the Verstellobjekt and actuated by electrical control, characterized in that the variable converter each as electromagnetic Actuators are designed and arranged to generate a magnetic field oriented in such a way that a magnetic tensile force is exerted on the Verstellobjekt in their electrical control and actuation. Actuator arrangement according to claim 1, characterized in that the electromagnetic converter comprises a printed circuit with coil - hereinafter referred to as "PCB coil" (5) -, wherein on one or more circuit boards one or more tracks (6) are formed, whose History is designed to form an inductor or the magnetic field generating coil. Actuator arrangement according to claim 2, characterized in that the PCB coil (5) is formed in multilayer technology, wherein the coil or its windings over a plurality of layers or over a plurality of superimposed and conductor tracks bearing planes extend. Actuator arrangement according to one of the preceding claims, characterized in that the electromagnetic variable converter or optionally the PCB coil (5) is set in operative connection with an iron or otherwise ferromagnetic body (3) for magnetic inference. Actuator assembly according to claim 4, characterized in that the PCB coil (5) or the other electromagnetic variable converter from the return body (3) comprises, surrounded or embedded in it with the proviso that even magnetic tensile forces on the Verstellobjekt (2) exercisable. Actuator arrangement according to claim 4 or 5, characterized in that the one or more circuit boards of the PCB coil (5) have a recess (8) which is filled or permeated by material of the ferromagnetic yoke body (3). Actuator arrangement according to one of claims 4-6, characterized in that the return body (3) has a groove (10), groove or other recess, wherein the PCB coil (5) is inserted or inserted. Actuator arrangement according to one of the preceding claims, characterized by a support means (1,4) made of non-ferromagnetic, non-magnetizable or at least only negligibly magnetizable, but heat-conducting material on which the PCB coil (5) or the electromagnetic converter and / or optionally the return body (3) are attached. Actuator arrangement according to claim 8, characterized in that the carrying device (1,4) a base plate (4), whereupon the electromagnetic transducer or PCB coils (5) and / or the one or more return body (3) applied with one side are, and / or comprises a module carrier strip (4), to which the PCB coils (5) or electromagnetic transducer and / or the one or more return body (3) are attached and / or supported with a different side. Actuator arrangement according to claim 9, characterized in that the ferromagnetic yoke body (3) over at least the greater part of its total length on the heat-conducting base plate (4) and / or module carrier strip (1) is attached. Actuator arrangement according to one of the preceding claims, characterized in that the PCB coil (5) or the electromagnetic variable converter is provided with an electrical switching element (7) for energizing and actuating. Actuator arrangement according to claim 11 and one of claims 8-10, characterized in that the switching element (7) of the electromagnetic actuator or the PCB coil (5) on or within the support means (1,4) is arranged. Actuator arrangement according to one of the preceding claims, characterized in that the guide needle (2) or the other Verstellobjekt formed with ferromagnetic material and disposed between the two electromagnetic actuators, wherein between the Verstellobjekt (2) and each of the electrically operated variable converter (5 ) a magnetic air gap (L) is formed. Actuator arrangement according to claims 13 and one of claims 8-10, characterized in that the guide needle (2) or the other Verstellobjekt designed as a bending element and with one end on the support means (1,4), optionally the module carrier strip (1 ) are attached. Method for moving or adjusting a guide needle (2) of a textile machine or other Verstellobjektes, in particular using an actuator assembly according to any one of the preceding claims, wherein two adjusting transducers disposed on both sides of the Verstellobjektes and set with this by respective electrical control in operative connection, characterized in that an electromagnetic variable converter (5) is used which is activated to generate a magnetic field which is aligned with the adjusting object (2) in order to exert a tensile force. A method according to claim 15, characterized in that the Verstellobjekt (2) by energizing one of the electromagnetic variable-speed converter (5) with a higher amperage is given a stroke or a movement up to a stop (9), and then to hold the Verstellobjektes ( 2) at the stop (9) the current is reduced to a lower current.

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