EP4202099A1 - Needle board and method of mounting a needle board - Google Patents

Abstract

A needle board (10) for attachment to a needle bar (8) of a needling machine (2), which is used to strengthen a fibrous web (4), comprises a carrier plate (26) with a receiving device (28) in which a plurality of in a row arranged needle modules (14) is received, and a fluid-actuable clamping device (30) which is set up to fix the plurality of needle modules (14) in the receiving device (28) at least in a first direction (Y).

Description

The present invention relates to a needle board and a method for equipping such a needle board, which is suitable for attachment to a needle bar of a needling machine that is used to strengthen a fibrous web.

A fiber web is usually fed to a needling machine at an inlet and is conveyed in the needling machine in a conveying direction of the fiber web to a needle zone. In the area of the needle zone there is at least one needle bar with a needle board attached to it, which is equipped with needles for strengthening the fibrous web. The needles condense the web of fibrous web by being pierced into the web of fibrous web and pulled out again at high frequency in a direction of piercing. The resulting product is a bonded fleece. The most varied forms of needling machines are known to those skilled in the art, including double-needle machines in which two needle bars are used for needling from above and below, or needling machines in which the needle bar is moved with the fibrous web during the bonding process in the conveying direction of the fibrous web.

Efforts are being made to increase the density of the needles of a needle board and thus the needling of the fibrous web in order to optimize the properties of the bonded fleece. However, this compression of the needles is limited due to shape and position tolerances in the manufacture and assembly of the needles, the needle boards, the hold-down and throat plates and the resulting increased risk of collision between the needles and the hold-down and throat plates. In the event of a collision, the needles could break, which is an unacceptable risk in many applications.

It is an object of the present invention to provide a needle board for a needle machine and a method for equipping such a needle board, which make it possible to increase the needle density.

This object is solved by the subject matter of claims 1 and 15, respectively.

A needle board according to the invention for attachment to a needle bar of a needling machine, which is used to strengthen a fibrous web, has a carrier plate with a Recording device, in which a plurality of needle modules arranged in a row is accommodated, each needle module of the plurality of needle modules having a plurality of needles. Furthermore, the needle board has a fluid-actuable clamping device, which is set up to fix the plurality of needle modules in the receiving device at least in a first direction.

In this way, the plurality of needle modules can be moved in the receiving device, freely positioned and aligned before the needle modules are fixed in their position. When aligning the needle modules, any dimensional deviations that occur can be taken into account. In addition, needle modules with a small number of rows of needles can be precisely manufactured and thus positioned as individually as possible. Despite the high density of needles on the needle board, a collision with other components of the needling machine, such as hold-down and needle plates, can be reliably avoided. The fluid-actuated clamping device is particularly well suited for fixing the plurality of needle modules since it is simple in design and actuation and can be easily integrated into the needle board.

The needle modules of the plurality of needle modules are preferably arranged one behind the other in a second direction in a row in the receiving device. The second direction is preferably oriented perpendicular to the first direction. Each needle module preferably has a module carrier and a plurality of needles which are accommodated in the module carrier and are preferably firmly connected to it. For example, the module carrier is made of plastic and the plurality of needles is cast or injected into the module carrier.

The plurality of needles of each needle module is preferably arranged in at least one row, with the at least one row of needles preferably extending in a third direction that is perpendicular to the first and second directions. The needles of a row are then arranged one behind the other in the third direction. Each needle module of the plurality of needle modules can have, for example, between one row and five rows of needles, preferably between one row and three rows of needles, more preferably exactly one row of needles. This allows the rows of needles to be as independent as possible, particularly with regard to hold-down and needle plates align and the needle modules are easy to produce. Not all needle modules have to have the same number of rows of needles.

The first direction, the second direction and the third direction preferably define a Cartesian coordinate system. In a preferred embodiment, the first direction is oriented substantially vertically and the second and third directions are oriented substantially horizontally. The second direction preferably extends parallel to a longitudinal direction of the needle board, which is aligned parallel to a working width of the needling machine, and the third direction preferably extends parallel to a conveying direction of the fibrous web.

The needle board can also have a plurality of receiving devices, the receiving devices preferably being arranged one behind the other in the third direction. A plurality of needle modules arranged in a row is then received in each receiving device of the plurality of receiving devices. All of the features and advantages described here with regard to the receiving device can therefore be transferred analogously to a plurality of receiving devices, which is why a separate description is dispensed with.

The clamping device is preferably a pneumatically actuatable clamping device. For example, the clamping device can be actuated by means of compressed air, which enables a particularly simple and cost-effective implementation. However, the use of other gases is also conceivable, as is the design of the clamping device as a hydraulically actuatable clamping device, which is actuated by means of a hydraulic fluid.

In a preferred embodiment, the clamping device is set up to bring about a holding force on the plurality of needle modules and/or the receiving device, at least in the first direction. The holding force fixes the needle modules at least in the first direction and can act directly on the needle modules and/or the receiving device. The clamping device particularly preferably fixes the plurality of needle modules in the receiving device in a form-fitting manner in the first direction and in a force-fitting manner in the second and/or third direction.

A certain amount of play between the needle modules, in particular the module carriers, and the receiving device is advantageous for inserting the plurality of needle modules into the receiving device and moving or aligning the needle modules in the second direction in the receiving device. By applying the holding force by means of the clamping device, the plurality of needle modules is then fixed at least in the first direction, for example by positive locking between a part of the receiving device and a component of the needle board or the carrier plate. Furthermore, the holding force can be sufficient to bring about a non-positive or frictional connection between the needle modules and the receiving device, so that these are also fixed in the second and third direction.

The clamping device can be adjustable between an actuated state and an unactuated state. The plurality of needle modules is preferably displaceable when the clamping device is in the non-actuated state for inserting and removing the needle modules, and is fixed in the receiving device when the clamping device is in the actuated state.

In one embodiment, the clamping device comprises at least one clamping element, which has a first state in which the plurality of needle modules can be moved in the receiving device, and a second state in which the at least one clamping element is expanded compared to the first state and the plurality of Sets needle modules in the receiving device. The first state of the clamping element can correspond to the non-actuated state of the clamping device and the second state of the clamping element can correspond to the actuated state of the clamping device. In this way, the clamping device is designed as simply as possible and without complex mechanics. In the second state, the at least one clamping element effects the holding force.

The clamping device can be actuated in that the at least one clamping element is vented in the first state and is pressurized in the second state. The at least one clamping element can be subjected to pressure by supplying fluid, in particular by compressed air. The at least one clamping element can therefore preferably be connected to a fluid source, for example a pump. For this purpose, the at least one clamping element can have at least one connection and/or a valve.

The at least one clamping element is preferably set up to independently maintain the second state. This can be achieved in that the at least one clamping element has a non-return valve, which enables fluid to be fed into the clamping element and prevents fluid from escaping of its own accord from the clamping element. Thus, no permanent fluid supply is required, which means that the needle board can be used flexibly and, in particular, does not require a connection to a fluid supply while the needle machine is in operation.

A particularly simple design of the at least one clamping element is made possible if the at least one clamping element is designed as a hose, in particular as a compressed air hose. On the one hand, the hose easily forms a fluid line for distributing the fluid in the needle board to actuate the clamping device, can be easily installed in the needle board and, in the second state, provides an even pressure distribution on the plurality of needle modules or the receiving device in order to To act clamping element of the clamping device.

So that the at least one clamping element can act uniformly on the plurality of needle modules or the receiving device, it preferably extends parallel to the second direction. The at least one clamping element can extend in the second direction along the entire receiving device. However, it is also conceivable to arrange several clamping elements one behind the other in the second direction.

A space-saving design and the most direct possible application of force can be achieved in that the at least one clamping element is accommodated in the receiving device. If there are several receiving devices, at least one clamping element is preferably received in each receiving device. Uniform force transmission and the avoidance of jamming between the needle modules and the receiving device can be achieved if two clamping elements, for example two hoses, are received in the receiving device. The two clamping elements are then preferably arranged symmetrically with respect to the plurality of needle modules, for example symmetrically with respect to a central plane or plane of symmetry of the needle modules, which is defined parallel to the first and to the second direction.

In a preferred embodiment, the receiving device is movably mounted in the first direction relative to the carrier plate and can be moved between a release position and a clamping position by means of the clamping device. The stroke of the receiving device between the release position and the clamping position can be 1 to 5 mm, preferably 1 to 2 mm.

The receiving device is in the release position when the at least one clamping element is in the first state. The receiving device is in the clamping position when the at least one clamping element is in the second state. In the release position there can be sufficient play between the plurality of needle modules and the receiving device in order to move the needle modules in the receiving device. By actuating the clamping device, in particular by converting the at least one clamping element into the second state, the receiving device can be moved into the clamping position, whereby the play between the plurality of needle modules and the receiving device is initially reduced and finally eliminated. The plurality of needle modules is then fixed in a form-fitting manner in the first direction.

For example, the needle board can include a contact element that is firmly connected to the carrier plate and is at least partially accommodated in the receiving device. On a side facing away from the carrier plate, the contact element has a contact surface against which an upper side of the plurality of needle modules can bear. The needles protrude from the respective module carrier on an underside of the needle modules opposite the upper side of the needle modules. In this case, the plurality of needle modules is received in the first direction between the contact element and the receiving device.

The contact element can have at least one fold that extends parallel to the second direction. The at least one fold can form a cavity in the contact element or between the contact element and the carrier plate and can be used to accommodate the at least one clamping element. The contact element preferably has two oppositely aligned folds running parallel to the second direction. The folds are arranged on a front side and a back side of the abutment element with respect to the third direction.

In a preferred embodiment, a first section of the receiving device extends into the cavity formed by the at least one fold. The at least one clamping element is received between the at least one fold and the first section of the receiving device. If the at least one clamping element is transferred to the second state, it moves the first section and thus the receiving device in the direction of the carrier plate. As a result, the plurality of needle modules is pressed against the receiving element.

The receiving device preferably comprises a first and a second receiving element which are opposite to one another in the first direction and receive between them the clamping device and the plurality of needle modules, the needles of the plurality of needle modules extending out of the receiving device, preferably between the first and the second receiving element. A longitudinal direction of the first and the second receiving element is preferably aligned parallel to the second direction and the first and the second receiving element form a guide for the needle modules running parallel to the second direction. The receiving device is thus designed as simply as possible, while the needle modules are reliably received and at the same time can be displaced parallel to the second direction. The first and the second receiving element preferably extend in the second direction over the entire width of the receiving device. However, it is also conceivable to arrange a plurality of first or second receiving elements one behind the other in the second direction. The first and the second receiving element can be formed, for example, from sheet metal, in particular sheet steel.

The first and the second receiving element are designed to carry the plurality of needle modules. Together, the first and the second receiving element can form the guide for moving the plurality of needle modules parallel to the second direction. In particular, each of the two receiving elements includes a support section for this purpose, on which an edge region of the module carrier of the plurality of needle modules rests. More precisely, each module carrier comprises a first edge area and a second edge area opposite the first edge area, with the at least one row of needles of the respective needle module extending from the first to the second edge area. The first edge area can then rest on the support section of the first receiving element and the second edge portion may rest on the support portion of the second receiving member.

In a preferred embodiment, the first and the second receiving element are each essentially C-shaped. In this case, the first and the second receiving element each have three limbs, with a first limb parallel to the carrier plate, a second limb at one end of the first limb perpendicular to the carrier plate and a third limb at an end of the second limb opposite the first limb extends parallel to the support plate. The third leg of the first and second receiving element preferably forms the support section of the respective receiving element. The first leg of the first receiving element and the first leg of the second receiving element can together form the first section of the receiving device, which is arranged in the cavity formed by the at least one fold of the contact element. The at least one clamping element is then arranged between the first leg of the first or second receiving element and the contact element.

The clamping device can act directly on the plurality of needle modules or, in particular if the receiving device is movably mounted relative to the carrier plate, can act on the receiving device.

In all of the embodiments, the needle board can further comprise a fluid-actuable release device which is set up to bring about a counterforce in a direction opposite to the holding force in order to release the plurality of needle modules in the receiving device. It may be that the at least one clamping element (e.g. in the form of a hose) cannot easily be converted back into the first state, for example due to incomplete or delayed venting, the elasticity of the material of the at least one clamping element and/or a bias of the same. The opposing force counteracts this in order to be able to insert or remove the majority of needle modules as simply as possible.

In an embodiment in which the clamping device acts on the receiving device and the receiving device is movably mounted relative to the carrier plate, the release device preferably transmits the counterforce to the receiving device.

In order to enable a simple and cost-effective construction, the release device preferably includes at least one pressure element. The at least one pressure element can be designed analogously to the at least one clamping element, for example with regard to its design or its structure, the actuation and the number of pressure elements, so that the features described in this regard can be transferred analogously to the at least one pressure element. The number of pressure elements preferably corresponds to the number of clamping elements, and a pressure element is assigned to each clamping element in order to counteract this. Two pressure elements are therefore preferably also provided for each receiving device, which are arranged symmetrically to the receiving device or to the plurality of needle modules.

The at least one pressure element can also have a first and a second state, with the at least one pressure element being expanded in the second state compared to the first state. The design of the at least one pressure element as a hose, in particular as a compressed air hose, is particularly suitable for this purpose. In the first state, the at least one pressure element produces essentially no counterforce, while in the second state it produces the counterforce and releases the plurality of needle modules in the receiving device.

In a preferred embodiment, the needle board comprises a plurality of layers arranged one on top of the other, with the carrier plate forming a first layer of the plurality of layers. The plurality of layers is preferably arranged one on top of the other in the first direction.

The plurality of layers may further include a further panel forming a second layer of the plurality of layers, the further panel and the backing panel being spaced apart from one another. The further plate is preferably arranged above the carrier plate in the first direction. The carrier plate and the further plate can have a thickness in the first direction which is between 5 and 10 mm, preferably between 6 and 8 mm.

The at least one pressure element is preferably arranged outside the receiving device. In this embodiment, the at least one pressure element can be accommodated between two layers of the plurality of layers of the needle board, for example between the carrier plate and the further plate. In this case, the further plate acts as an abutment for the at least one pressure element, so that the counterforce caused by this is exerted in a targeted manner on the receiving device in the first direction.

Despite the multi-layer structure of the needle board, its weight and dimensions should be kept as low as possible. It is therefore preferred that the carrier plate and/or the further plate are made of fiber-reinforced material.

In order to arrange the carrier plate and the further plate at a defined distance from one another, it is preferred that the plurality of layers also includes a third layer, which is formed by at least one spacer element. The at least one spacer element is arranged in the first direction between the carrier plate and the further plate. A plurality of spacer elements is preferably provided, which each extend parallel to the second direction and which are arranged spaced apart from one another in the third direction. Thus, between each two adjacent spacer elements of the plurality of spacer elements, an intermediate space is formed, which is delimited at the top by the further plate and in which a pressure element can be accommodated.

The at least one spacer element can be designed, for example, as a strip or flat profile, preferably made of aluminum. The at least one spacer element can have a thickness in the first direction that is between 3 and 8 mm, preferably between 5 and 6 mm.

Instead of a plurality of spacer elements, it is also conceivable for the at least one spacer element to be essentially plate-shaped and to include at least one recess in order to form a cavity for accommodating the at least one pressure element.

A pressure element is preferably arranged in each case in the first direction above a clamping element. In general, the release device can include at least one transmission element, the at least one pressure element using the counterforce of the at least one transmission element transmits, preferably to the receiving device. The at least one transmission element can be designed as a pin or bolt, for example. A plurality of transmission elements is preferably assigned to each printing element, the transmission elements which are assigned to the same printing element being arranged one behind the other in the second direction. The carrier plate can comprise a plurality of through openings, the number of which corresponds to the number of transmission elements and in which the transmission elements are accommodated.

The at least one transmission element preferably extends from the at least one pressure element through a through-opening in the carrier plate to the receiving device, in particular to the first section of the receiving device or to the first leg of the first or second receiving element. In this way, the release device can exert the opposing force on an upper side of the first section of the receiving device, while the clamping device can exert the holding force on the underside of the first section of the receiving device.

During operation, a puncture direction of the plurality of needle modules in the web to be consolidated is aligned essentially parallel to the first direction. Accelerations therefore act on the plurality of needle modules essentially parallel to the first direction. In the first direction, the plurality of needle modules is fixed by the clamping device, in particular in a form-fitting manner between the first and the second receiving element and the carrier plate or the contact element. In the second direction, the needle modules of the plurality of needle modules can basically be displaced relative to one another and the holding force can be sufficient to positively fix the plurality of needle modules in the second direction. In the third direction, too, the plurality of needle modules can be fixed in a correspondingly non-positive manner.

In some applications, however, it is also desirable to move the needle board with the fibrous web in the conveying direction while it engages with it. During the oscillating movement, the needle board also experiences a movement component parallel to the third direction. In this case it is possible that the acceleration forces overcome the adhesive force of the needle modules or that the receiving device, in particular the first and the second receiving element, is deformed.

In all embodiments of the present invention, the needle board can therefore have a spreading device which is set up to bring about a securing force on the receiving device at least in the third direction. The securing force in turn can be used to fix the plurality of needle modules in the third direction in a form-fitting manner in the receiving device. Additionally or alternatively, the securing force can fix the plurality of modules in a non-positive manner. The spreading device can therefore ensure that the plurality of needle modules is fixed in the receiving device even during accelerations in the third direction.

The securing force can be designed in such a way that it deforms the receiving device, in particular the first and/or the second receiving element, in the direction of the module carrier of the plurality of needle modules and thereby fixes them in the third direction, preferably in a form-fitting manner between the first and the second receiving element.

The spreading device can comprise at least one spreading element which tapers from a foot section in the direction of the carrier plate. The at least one spreading element can be designed, for example, in the form of a strip that extends parallel to the second direction.

The foot section of the at least one spreading element is preferably arranged below the third leg of the first and/or second receiving element in the first direction and comprises a support area for the third leg. From the foot section, the at least one spreading element runs at least partially along the second leg of the respective receiving element. The position of the at least one spreading element can be adjustable relative to the carrier plate, for example by screwing the spreading element to the needle board.

First, the at least one spreading element is located at a distance from the carrier plate that allows the receiving device to be arranged in the release position. If the receiving device is then transferred into the clamping position, the at least one spreading element can be moved parallel to the first direction in the direction of the carrier plate. Due to the tapered design of the at least one expansion element, the first and/or the second receiving element becomes increasingly numerous in the third direction deformed by needle modules. The securing force essentially acts on the second leg of the first or second receiving element.

If a plurality of receiving devices is provided, a spreading element is preferably arranged between two adjacent receiving devices. Each spreading element can then engage the second receiving element of one receiving device under the first receiving element of the adjacent receiving device and spread them apart.

As an alternative to each spreading element, a fluid-actuable clamping means can also be used inside or outside the respective receiving device, which is constructed analogously to the clamping elements described above, runs in the first and second direction and exerts a clamping force on the needle modules in the third direction.

The present invention also relates to a needling machine for needling a nonwoven web, the needling machine comprising a needle bar arrangement which comprises a needle bar and at least one needle board according to the invention which is attached to the needle bar. In this way, a needling machine is provided which is suitable for very high needle densities without having an increased risk of needles colliding with hold-down or throat plates of the needling machine.

The needling machine preferably has a first main shaft on which a first main connecting rod is mounted eccentrically, which connects the first main shaft in an articulated manner to the needle bar arrangement. As a result, an oscillating movement of the needle bar arrangement can be implemented in the puncture direction, with the puncture direction preferably being aligned essentially parallel to the first direction.

In order to achieve a substantially elliptical path of movement of the needle bar arrangement, the needling machine can furthermore have a second main shaft, on which a second main connecting rod is eccentrically mounted, which articulately connects the second main shaft to the needle bar arrangement. The first and second main shafts preferably rotate in opposite directions.

The fibrous web to be bonded is moved through the needling machine in a conveying direction that is aligned essentially parallel to the third direction. In the area of the needle bar arrangement, the fibrous web is preferably accommodated between a hold-down device and a throat plate of the needling machine, which are arranged above or below the fibrous web and have openings for the entry or passage of the needles of the plurality of needle modules.

In the case of high needle densities, the hold-down plate in particular can be designed as a wire plate which comprises a plurality of stationary wires running parallel to the conveying direction. The wires are spaced from each other in the second direction. During operation of the needling machine, one needle row of the plurality of needle modules preferably passes between two adjacent wires and enters the fibrous web. Accordingly, it is necessary for the needle modules to be positioned in the second direction such that the rows of needles are arranged between the wires in order to avoid collisions.

The at least one needle board is preferably detachably connected to the needle bar so that the needling machine can be equipped with different needle boards or the at least one needle board can be easily fitted with the plurality of needle modules outside of the needling machine.

In a preferred embodiment, the needling machine comprises a further fluid-actuated clamping device which is set up to fasten the at least one needle board to the needle bar. This enables easy and safe assembly of the needle board.

For better differentiation, the clamping device of the needle board for fixing the plurality of needle modules in the receiving device is also referred to herein as the first clamping device and the clamping device of the needling machine for fastening the needle board to the needle bar is also referred to as the second clamping device.

The second clamping device can also be a pneumatically actuated clamping device, comprising at least one second clamping element, preferably in the form of a hose, which can be adjusted between a first and a second state. The Characteristics of the first clamping device can therefore be transferred essentially analogously to the second clamping device. In particular, the at least one second clamping element runs parallel to the second direction.

In a preferred embodiment, the needle bar includes a front and a rear shoulder. The front paragraph is directed forward in the conveying direction. The rear paragraph is directed backwards in the conveying direction. A second clamping element of the second clamping device is arranged in each case on an upper side of the front and of the rear shoulder facing away from the needle board.

Furthermore, a clamping angle, more precisely a front and a rear clamping angle, is provided in each case. The front and rear clamping angles preferably each comprise a first leg which is arranged essentially parallel to the needle board and above the respective second clamping element, a second leg which extends downwards from the first leg next to the needle bar, and a third leg which extends parallel to the first leg in the direction of the needle board and engages with the needle board. The at least one second clamping element is consequently accommodated between the front or rear step of the needle bar and the first leg of the front or rear clamping bracket.

If the needle board comprises a plurality of layers, a fold, in which the third leg engages, is preferably formed between two layers of the plurality of layers. For example, this fold is formed between the carrier plate and the other plate of the needle board. This can be achieved in that the at least one spacer element is less wide in the third direction than the further plate.

If the clamping elements of the second clamping device are in the first state, the needle board can be detached from the needle bar or attached to it. If the clamping elements of the second clamping device are in the second state, the needle board is pulled upwards by means of the clamping brackets and pressed against the needle bar and is fixed to it.

• Einsetzen einer Mehrzahl von Nadelmodulen in eine Aufnahmeeinrichtung, die an einer Trägerplatte des Nadelbretts angebracht ist, wobei sich Nadeln der Mehrzahl von Nadelmodulen in eine erste Richtung erstrecken und die Nadelmodule der Mehrzahl von Nadelmodulen in der Aufnahmeeinrichtung in einer zweiten Richtung, die senkrecht zur ersten Richtung ausgerichtet ist, hintereinander angeordnet und relativ zueinander beweglich sind;
• Erzeugen einer Relativbewegung zwischen dem Nadelbrett und einer Einstelleinrichtung, wobei die Einstelleinrichtung eine Mehrzahl von Einstellelementen umfasst, die parallel zueinander angeordnet sind und sich in einer dritten Richtung erstrecken, die senkrecht zur ersten und zur zweiten Richtung ausgerichtet ist;
• Ausrichten der Mehrzahl von Nadeln an der Mehrzahl von Einstellelementen durch die Relativbewegung zwischen dem Nadelbrett und der Einstelleinrichtung;
• Festlegen der Mehrzahl von Nadelmodulen in der Aufnahmeeinrichtung nach dem Ausrichten mittels einer fluidbetätigbaren Klemmeinrichtung.

The present invention further relates to a method for equipping a needle board that is intended for attachment to a needle bar of a needling machine, the method comprising the following steps:

• inserting a plurality of needle modules into a receptacle attached to a support plate of the needle board, needles of the plurality of needle modules extending in a first direction and the needle modules of the plurality of needle modules in the receptacle in a second direction perpendicular to the first direction aligned, arranged in tandem and movable relative to each other;
• Generating a relative movement between the needle board and an adjustment device, the adjustment device comprising a plurality of adjustment elements which are arranged parallel to one another and extend in a third direction which is perpendicular to the first and second directions;
• aligning the plurality of needles on the plurality of adjusters by the relative movement between the needle board and the adjuster;
• Securing the plurality of needle modules in the receiving device after the alignment with a fluid-actuable clamping device.

In this way, the needle modules that have already been manufactured can be aligned precisely, taking into account dimensional deviations, in order to avoid collisions during operation, as described at the outset for the needle board according to the invention.

The method is particularly preferably used to equip a needle board according to the invention. All of the features and advantages described with reference to the needle board can therefore be transferred analogously to the method according to the invention and vice versa.

The needle board can be loaded outside of the needle machine in the setting device, with the needle board and the needle modules being particularly easily accessible. The plurality of adjustment elements is then preferably designed in accordance with the hold-down plate, in particular designed as a wire plate. In this case, the plurality of adjusting elements can be formed by a plurality of wires. However, it is also conceivable to equip the needle board in the needle machine, in which case the hold-down plate can form the setting device.

The plurality of needle modules is inserted into the receiving device and can initially be moved in the second direction. The relative movement preferably takes place parallel to the longitudinal or puncture direction of the needles, which can correspond to the first direction. During the relative movement between the needle board and the setting device, the needles of incorrectly aligned needle modules can touch the respective adjoining setting element. Since the plurality of setting elements is arranged in a stationary manner, the needle module in question is then displaced in the second direction during the relative movement until they would no longer collide with one another when they are moved again in the puncture direction. Preferably, each row of needles is then arranged between two adjacent adjustment elements. The majority of cartridges are now properly aligned and ready to be locked. It is also possible for the relative movement to have a component in the second and/or the third direction. For example, the needles of the plurality of needle modules can first be arranged between the adjustment elements and the needle board or the adjustment device can then be vibrated in order to bring about a distribution and alignment of the plurality of needle modules.

• Erzeugen einer Haltekraft in der ersten Richtung auf die Mehrzahl von Nadelmodulen und/oder die Aufnahmeeinrichtung mittels der Klemmeinrichtung; und
• Formschlüssiges Festlegen der Mehrzahl von Nadelmodulen in der ersten Richtung und kraftschlüssiges Festlegen der Mehrzahl von Nadelmodulen in der zweiten Richtung sowie vorzugsweise der dritten Richtung durch die Haltekraft.

The step of determining the plurality of needle modules preferably includes the following steps:

• generating a holding force in the first direction on the plurality of needle modules and/or the receiving device by means of the clamping device; and
• Positive locking of the plurality of needle modules in the first direction and non-positive locking of the plurality of needle modules in the second direction and preferably the third direction by the holding force.

If the needle board is fitted outside of the needling machine, the needle board can be inserted into the needling machine after it has been fitted with the plurality of needle modules and the plurality of needle modules have been fixed. In the needling machine, the needle board is preferably fastened to the needle bar by means of the second clamping device.

Since the plurality of clamping elements of the first clamping device preferably maintain the second state independently, they can after the setting of the plurality of Needle modules are separated from a suitable fluid supply, so that the needle board is unhindered when loaded.

If the needle board includes a spreading device, as described above, the method can also include actuating the spreading device after the plurality of needle modules have been fixed by means of the first clamping device in order to positively secure the plurality of needle modules in the third direction as well. The actuation of the spreading device preferably includes moving the at least one spreading element in the direction of the carrier plate, as a result of which at least one receiving element of the receiving device is deformed.

Fig. 1

zeigt eine schematische Ansicht einer Nadelmaschine.

Fig. 2

zeigt eine Querschnittsansicht einer Nadelbalkenanordnung mit einem erfindungsgemäßen Nadelbrett.

Fig. 3

zeigt in vergrößerter Ansicht einen Ausschnitt der Querschnittsansicht nach Fig. 2.

Fig. 4

zeigt in vergrößerter Ansicht einen Ausschnitt der Nadelbalkenanordnung nach Fig. 2 in einer Querschnittsansicht in einer anderen Schnittebene.

Fig. 5

zeigt schematisch eine Einstelleinrichtung zum Ausrichten einer Mehrzahl von Nadelmodulen des Nadelbretts.

Further features and advantages of the present invention emerge from the following description with reference to the accompanying drawings.

1

shows a schematic view of a needle loom.

2

shows a cross-sectional view of a needle bar arrangement with a needle board according to the invention.

3

shows a detail of the cross-sectional view in an enlarged view 2 .

4

shows a detail of the needle bar arrangement in an enlarged view 2 in a cross-sectional view in a different section plane.

figure 5

shows schematically an adjustment device for aligning a plurality of needle modules of the needle board.

In 1 the basic structure of a needle loom 2 is shown schematically. The needling machine 2 serves to consolidate a fibrous web 4 which is fed to the needling machine 2 in a conveying direction F and which passes through the needling machine 2 in the conveying direction F. The needling machine 2 comprises a needle bar arrangement 6 with a needle bar 8 and at least one needle board 10 which is detachably fastened to the needle bar 8 . The needle board 10 has a plurality of needles 12, which are part of a plurality of needle modules 14, which are in the Figures 2 to 5 are shown in detail.

To solidify the fibrous web 4 , the needles 12 are moved up and down in an oscillating manner in a puncture direction E and thereby penetrate the fibrous web 4 . The puncture direction E is preferably aligned essentially perpendicularly to the conveying direction F.

In order to penetrate as deeply as possible into the fibrous web 4 or, if necessary, to be able to penetrate it, the needling machine 2 can have a throat plate 18 in a needle zone 16 in which the needle bar arrangement 6 is also arranged. The needle plate 18 supports the fibrous web 4 in the needle zone 16 and has openings into which the tips of the needles 12 can enter if they penetrate the fibrous web 4 . In order to pull out no or as few fibers as possible from the fibrous web 4 when the needles 12 are pulled out of the fibrous web 4, the needling machine 2 also has a hold-down plate 20 in the needle zone 16. The hold-down plate 20 is arranged above the fibrous web 4 and holds the fibrous web 4 and in particular whose fibers back when the needles 12 are pulled out. The hold-down plate 20 has openings through which the needles 12 can pass.

Since it is difficult with high needle densities due to the very small distance between the needles 12 to provide a corresponding number of openings and to align them precisely with the needles, the throat plate 18 and the hold-down plate 20 can be designed as wire plates. Each wire plate comprises a plurality of wires arranged in a stationary manner and aligned parallel to the conveying direction F. The wires of the plurality of wires are arranged at a distance from one another in a direction perpendicular to the conveying direction F and to the piercing direction E in order to allow the needles 12 to pass through. For example, each row of needles 12 arranged parallel to the third direction can pass between two adjacent wires.

The needling machine 2 also has a first main shaft 22 on which a first main connecting rod 24 is mounted eccentrically. The first main connecting rod 24 articulately connects the first main shaft 22 to the needle bar assembly 6. In some applications, the needling machine 2 also includes a second main shaft and a second main connecting rod, which are designed analogously to the first main shaft 22 and the first main connecting rod 24.

In 1 a Cartesian coordinate system is also shown, which has a first direction Y, a second direction Z and a third direction X. Preferably, the first direction Y is oriented substantially vertically and the second direction Z and the third direction X are oriented substantially horizontally. The conveying direction F is preferably aligned parallel to the third direction X and the puncture direction E is aligned parallel to the first direction Y.

In 2 the needle bar arrangement 6 with the needle bar 8 and the needle board 10 is shown in more detail in a cross-sectional view, the section plane being defined by the first direction Y and the third direction X. The needle board 10 includes a carrier plate 26 with at least one receiving device 28 in which a plurality of needle modules 14 is received. In the embodiment shown, five receiving devices 28 are provided, which are arranged next to one another in the third direction X and each of which receives a plurality of needle modules 14 . The receiving devices 28 are constructed analogously, which is why only one receiving device 28 is described in more detail, the features of which can be transferred analogously to any number of receiving devices 28 .

The needle board 10 also includes a fluid-actuated clamping device 30, which is also referred to as the first clamping device 30 and preferably has at least one first clamping element 32, here two first clamping elements 32a, 32b. The first clamping device 30 and the way it works are described with reference to FIG Figures 3 and 4 described in more detail.

The needle bar arrangement 6 can comprise a second fluid-actuated clamping device 34 which can have at least one second clamping element 36 and here has two second clamping elements 36a, 36b. The second clamping device 34 is provided for fastening the needle board 10 to the needle bar 8 . For this purpose, the needle bar 8 can have a front shoulder 38 and a rear shoulder 40 which protrude forwards and backwards from the needle bar 8 with respect to the conveying direction F. A second clamping element 36a, 36b is arranged on each of the shoulders 38, 40 and extends parallel to the second direction Z.

In this exemplary embodiment, the second clamping device 34 also includes a rear first clamping bracket 42 and a front second clamping bracket 44. The first and second clamping brackets 42, 44 clamp the needle board 10 to the needle bar 8. For this purpose, each of the two clamping brackets 42, 44 has a first leg 42a, 44a extending substantially horizontally and above the respective shoulder 38, 40, a second leg 42b, 44b extending substantially vertically downwardly from the first leg 42a, 44a adjacent the respective shoulder 38, 40, and a third leg 42c, 44c, which extends from the second leg 42b, 44b essentially horizontally in the direction of the needle board 10. The third leg 42c, 44c engages with the needle board 10 by extending, for example, into a fold 46 formed on the needle board 10, which is also referred to as a needle board fold.

The second clamping elements 36a, 36b are preferably adjustable between a first and a second state, being expanded in the second state compared to the first state. If the second clamping device 34 is designed as a pneumatically actuable clamping device 34, the second clamping elements 36a, 36b can be designed as hoses, in particular as pneumatically actuable pressure hoses. If the second clamping elements 36a, 36b are in the first state, the first and second clamping brackets 42, 44 are lowered and the needle board 10 can be inserted or removed parallel to the second direction Z. If the second clamping elements 36a, 36b are in the expanded second state, the first and second clamping brackets 42, 44 are raised by the clamping elements parallel to the first direction Y and the needle board 10 is thereby pressed against the needle bar 8. In this way, the needle board 10 is firmly attached to the needle bar 8 .

Further details of the needle board 10 are provided below with reference to FIG Figures 2 to 4 described.

The plurality of needle modules 14 are arranged one behind the other in the second direction Z in the receiving device 28 . Each needle module 14 has a module carrier 48 in which the needles 12 of the needle module 14 are accommodated. Each needle module 14 preferably has only one row of needles 12, the needles 12 being arranged in a row one behind the other in the third direction X. The plurality of needle modules 14 is such accommodated in the receiving device 28 that a longitudinal direction of the needles 12 extends parallel to the puncture direction E.

The receiving device 28 is designed in such a way that the needle modules 14 of the plurality of needle modules 14 can be inserted or pushed into the receiving device 28 , can be displaced in the receiving device 28 parallel to the second direction Z and are held by the receiving device 28 . The receiving device 28 can comprise a first receiving element 50 and a second receiving element 52, the longitudinal direction of which preferably extends parallel to the second direction Z. The first and second receiving members 50, 52 oppose one another in the third direction and receive the plurality of needle modules 14 therebetween, with the needles 12 extending out of the receiving means 28 between the first and second receiving members 50, 52.

In order to carry the plurality of needle modules 14, each receiving element 50, 52 comprises a support section 54, 56, on which a respective edge region 48a, 48b of the module carrier 48 rests. The first edge area 48a and the second edge area 48b of each module carrier 48 lie opposite one another and the at least one row of needles of the respective needle module 14 extends between the first and the second edge area 48a, 48b.

As shown, the first and second receptacles 50, 52 may be generally C-shaped. The first and second receiving elements 50, 52 each have a first leg 50a, 52a, a second leg 50b, 52b and a third leg 50c, 52c, respectively. The first leg 50a, 52a and the third leg 50c, 52c are arranged parallel to one another and the second leg 50b, 52b extends substantially perpendicular to the first and third legs between them. The third leg 50c, 52c of the first or second receiving element 50, 52 can form the respective support section 54, 56 on which the module carrier 48 rests.

The needle board 10 can also include a contact element 58 which is firmly connected to the carrier plate 26, for example screwed. On a side facing away from the carrier plate 26, the contact element 58 has a contact surface 60 against which an upper side of the plurality of needle modules 14 can bear.

In order to fix the plurality of needle modules 14 in the receiving device 28 , the receiving device 28 can be movably mounted in the first direction Y relative to the carrier plate 26 . For example, the contact element 58 has two oppositely aligned folds 62, 64 running parallel to the second direction, namely a rear fold 62 and a front fold 64. The folds 62, 64 form a cavity between the contact element 58 and the carrier plate 26, in which a first portion of the receiving device 28 can extend into it. The first section of the receiving device 28 is formed, for example, by the first legs 50a, 52a of the first and the second receiving element 50, 52. The first section of the receiving device 28 can thus move up and down between the contact element 58 and the carrier plate 26 and is at the same time secured on the carrier plate 26 with respect to the first direction Y.

The first clamping device 30 is set up to fix the plurality of needle modules 14 in the receiving device 28 at least in the first direction Y, in particular by exerting a holding force on the plurality of needle modules 14 and/or the receiving device 28 in the first direction Y. As a result, the first clamping device 30 fixes the plurality of needle modules 14 in a form-fitting manner in the first direction Y and in a force-fitting manner in the second and third directions.

The first clamping device 30 is preferably adjustable between an actuated and an unactuated state. For this purpose, the first and the second clamping element 32a, 32b can have a first state in which the plurality of needle modules 14 can be moved in the receiving device 28, and a second state in which the first and the second clamping element 32a, 32b are opposite to the first State are expanded and set the plurality of needle modules 14 in the receiving device 28. The first and the second clamping element 32a, 32b preferably extend parallel to the second direction Z.

The first clamping device 30 is preferably designed as a pneumatically actuatable clamping device, with the first and the second clamping element 32a, 32b each being formed by a hose. The clamping device 30 is actuated by the supply of air, the first and the second clamping element 32a, 32b being transferred from the first state into the second state.

The first and the second clamping element 32a, 32b are preferably accommodated in the receiving device 28. In the illustrated embodiment, the clamping elements 32a, 32b are accommodated in the cavity formed by the folds 62, 64 between the abutment element 58 and the carrier plate 26. More precisely, the first clamping element 32a is arranged on the rear fold 62 of the abutment element 58 and is accommodated between the abutment element 58 and the first leg 50a of the first receiving element 50 . The second clamping element 32b is arranged on the front fold 64 of the abutment element 58 and is received between the abutment element 58 and the first leg 52a of the second abutment element 52 .

If the first and the second clamping element 32a, 32b are transferred into the second state, they move the first legs 50a, 52a of the contact elements 50, 52 parallel to the first direction Y upwards since the folds 62, 64 of the contact element 58 are stationary.

In 3 and 4 the clamping elements 32a, 32b are shown in the second state. In this state, the first and the second clamping element 32a, 32b bring about the holding force on the first and the second receiving element 50, 52 of the receiving device. The plurality of needle modules 14 is pressed upwards and against the contact element 58 by means of the receiving elements 50 , 52 . The plurality of needle modules 14 is then received in a form-fitting manner between the contact surface 60 of the contact element 58 and the support sections 54, 56 of the receiving elements 50, 52. The friction between the plurality of needle modules 14 and the contact element 58 and the receiving elements 50, 52 can be sufficient to fix the plurality of needle modules 14 also in the second and the third direction Z, X in a non-positive manner.

In order to return the first and second clamping elements 32a, 32b to the first state, they can be vented. In addition, the needle board 10 can comprise a fluid-actuable release device 66 which causes a counter-force in a direction opposite to the holding force, as a result of which the plurality of needle modules 14 in the receiving device 28 are released. This may be necessary, for example, in order to vent or compress the clamping elements 32a, 32b sufficiently.

In particular, when the first clamping device 30 acts on the receiving device 28 , the release device 66 can also act on the receiving device 28 . In the illustrated In the embodiment, the release means 66 acts on the first and second receiving members 50, 52 to move them back down in opposition to the movement effected by the first clamping means 30. For this purpose, the release device 66 preferably comprises at least one pressure element 68, here a first pressure element 68a and a second pressure element 68b. The first and the second pressure element 68a, 68b can be designed analogously to the clamping elements 32a, 32b. This means that the pressure elements 68a, 68b are preferably formed by pneumatically actuable hoses and extend parallel to the second direction Z.

The first and second compression members 68a, 68b have a first state and a second state, with the compression members 68a, 68b being expanded in the second state relative to the first state. In the second state, the first and the second pressure element 68a, 68b bring about the opposing force. The pressure elements 68a, 68b preferably maintain the second state independently.

The number of pressure elements 68a, 68b preferably corresponds to the number of clamping elements 32a, 32b, so that each pressure element 68 is assigned to a clamping element 32 and can counteract this. The release device 66 can comprise at least one transmission element 70, with each pressure element 68a, 68b being assigned at least one transmission element 70a, 70b, via which it acts on the receiving device 28. The at least one transmission element 70 can be designed as a bar that runs parallel to the second direction Z, or, as here, as a pin. In this case, a plurality of transmission elements 70 is preferably provided for each pressure element 68, the transmission elements 70 being arranged one behind the other in the second direction Z.

The support plate 26 includes a plurality of through-openings 72a, 72b, the number of which corresponds to the number of transmission elements 70 and in which the transmission elements 70 are accommodated. Each transmission element 70a, 70b extends from the pressure element 68a, 68b, to which it is assigned, through one of the through-openings 72a, 72b to the receiving device 28, in particular to the first section of the receiving device 28, which is here through the first legs 50a, 52a of the first and second receiving element 50, 52 is formed.

If the first and the second pressure element 68a, 68b are transferred into the second state, they bring about the counterforce directed downwards on the transmission elements 70a, 70b, since they are supported upwards in the needle board 10. The opposing force is transmitted via the transmission elements 70a, 70b to the first and the second receiving element 50, 52, which are thereby moved downward if the opposing force is greater than the holding force or the clamping elements 36a, 36b are vented. The form fit between the needle modules 14 and the receiving device 28 is released and the needle modules 14 can be moved and removed.

One or more release devices 66 can be accommodated in the needle board 10 in a particularly advantageous manner in that the needle board 10 comprises a plurality of layers arranged one on top of the other. The backing plate 26 forms a first layer of the plurality of layers and another plate 74 forms a second layer of the plurality of layers. The carrier plate 26 and the further plate 74 are arranged at a distance from one another and the pressure elements 68 of the at least one release device 66 are arranged between the carrier plate 26 and the further plate 74 . In the needle bar arrangement 6, the further plate 74 is preferably in contact with the needle bar 8, for example with an upper side facing away from the carrier plate 26.

The plurality of layers may further include a third layer formed by at least one spacer element 76 arranged between the carrier plate 26 and the further plate 74 in order to position them at a defined distance. As in 4 As can be seen, the plurality of layers is preferably firmly connected to one another, for example screwed.

The layers of the plurality of layers of the needle board 10 are preferably dimensioned such that they form the needle board folds 46 in which the first and second clamping angles 42, 44 of the second clamping device 34 engage. For example, for this purpose the further plate 74 protrudes in the third direction X on both sides beyond the at least one spacer element 76 .

Exactly one essentially plate-shaped spacer element 76 can be provided, which includes corresponding recesses for receiving the pressure elements 68 of the release device 66 . In the illustrated embodiment, the needle plate 10 includes a A plurality of spacer elements 76a, 76b, 76c, 76d, 76e which are formed separately from one another and whose longitudinal direction extends parallel to the second direction Z and which are arranged at a distance from one another in the third direction X. In this way, each pressure element 68 of the at least one release device 66 can be accommodated in an intermediate space between two adjacent spacer elements 76 .

Additional securing of the plurality of needle modules 14 in the receiving device 28 in the third direction X can be achieved by at least one spreading device 78 which is set up to bring about a securing force on the receiving device 28 at least in the third direction X. As a result, the plurality of needle modules 14 can be positively fixed in the third direction X. In particular, the spreading device 78 deforms the first and/or the second receiving element 50, 52 in such a way that the plurality of needle modules 14 are fixed in the third direction X in a form-fitting manner.

The spreading device 78 comprises at least one spreading element 80, which is assigned to one of the first and the second receiving element 50, 52. A spreading element 80 is preferably assigned to each receiving element 50 , 52 of the receiving device 28 or the plurality of receiving devices 28 . If several receiving devices 28 are provided next to each other, as in 2 shown, a spreading element 80 can be arranged between two adjacent receiving devices 28 and thus assigned to the first receiving element 50 of one receiving device 28 and to the second receiving element 52 of the adjacent receiving device 28 .

The at least one spreading element 80 has a foot section 82, which is preferably arranged below the respective receiving element 50, 52 in the first direction Y. For example, the foot section 82 can form a support area for the third leg 50c, 52c of the first and second receiving elements 50, 52, respectively. The at least one spreading element 80 extends upwards from the foot section 82 along the second leg 50b, 52b of the respective receiving element 50, 52. The at least one spreading element 80 is particularly preferably designed to taper from the foot section 82 in the direction of the carrier plate 26 . The at least one spreading element 80 can extend in the form of a strip parallel to the second direction Z, or a plurality of spreading elements 80 can be arranged one behind the other in the second direction Z.

In order to bring about the securing force on the receiving device 28, the position of the at least one spreading element 80 relative to the carrier plate 26 is preferably adjustable. As shown, the spreading element 80 can be screwed to the needle board 10 for this purpose. The screw connection 84 preferably extends from an upper side of the plurality of layers, here formed by the upper side of the further plate 74, through the plurality of layers and into the at least one spreader element 80. As a result, the position of the at least one spreader element 80 can be changed at any time prior to fastening of the needle board 10 can be set on the needle bar 8, since the screw connection is accessible from the top. When the screw connection 84 is tightened, the spreader element 80 moves toward the carrier plate 26 , while loosening the screw connection 84 moves the spreader element 80 away from the carrier plate 26 .

As in 3 and 4 shown, the receiving device 28 is in a clamping position in which the plurality of needle modules 14 is fixed in the receiving device 28 . If the at least one spreader element 80 is now moved in the direction of the carrier plate 26, the narrowing of the spreader element 80 in particular causes an increasing securing force on the receiving elements 50, 52 in the third direction X and their deformation until they come into contact with the module carrier 48 of the needle modules 14.

The correct positioning of the plurality of needle modules 14 can be ensured by this measure even with horizontal accelerations in the conveying direction F. At the edges of the needle board 10 arranged at the front and rear in the third direction X, stops 86 can also be provided, which are preferably made of carbon fiber reinforced material. The stops 86 extend parallel to the second direction along the needle board 10 and can be screwed to the carrier plate 26, for example. The stops 86 support the frontmost or rearmost support element 80 in the third direction X in the third direction X, in order to prevent a deformation of the latter during acceleration in the third direction X.

Based on the needle board 10 according to the Figures 2 to 4 will be further referred to figure 5 a method according to the invention is described. To equip the needle board 10 with needle modules 14, the plurality of needle modules 14 are first inserted into the at least one receiving device 28, where the needle modules 14 are arranged one behind the other in the second direction Z and are movable relative to one another. The recording facility 28 is for this purpose preferably in the release position, the first clamping device 30 in the unactuated state. The pressure elements 68 of the release device 66, if present, can be in their second state.

A relative movement is then generated between the needle board 10 and an adjustment device 88, which is shown schematically in figure 5 is shown. The adjustment device 88 comprises a plurality of adjustment elements 90 which are arranged parallel to one another and extend in the third direction. The adjusting elements 90 can be formed by wires, for example, and can be arranged in a stationary manner. The adjustment device 88 can be a separate device outside of the needle machine 2 or can be formed by the throat plate 18 or the hold-down plate 20 of the needle machine 2 . If the adjustment device 88 is a separate device, the adjustment elements 90 are preferably designed to correspond to the stitch and/or hold-down plate 18, 20 of the needle machine 2 in order to align the needle modules 14 in a suitable manner. Consequently, it is preferred that the plurality of adjustment elements 90 define the pitch of the needle modules 14 in such a way as is desired in the needling machine 2 .

The relative movement is at least a stroke of the needle board 10 and the adjustment device 88 relative to one another parallel to the first direction Y, as indicated by the arrow B. The relative movement between the needle board 10 and the setting device 88 aligns the plurality of needles 12 of the plurality of needle modules 14 on the plurality of setting elements 90 . If a needle 12 hits an adjustment element 90, the relative movement causes it to slide along the adjustment element 90, as a result of which the needle module 14, which includes this needle 12, is displaced in the second Z direction. This can already lead to the needle modules 14 being correctly aligned.

However, it is also conceivable for the plurality of needles 12 to be initially arranged between the plurality of adjustment elements 90 as a result of the relative movement in the direction of movement B, possibly to be displaced somewhat in the process, as just described, and then as a result of a further movement component of the relative movement at least in the second direction Z align more precisely. The relative movement can then include both a component in the first direction Y and in the second direction Z. For example, the needle board 10 or the adjustment device 88 is vibrated.

If the plurality of needle modules 14 is correctly aligned, the plurality of needle modules 14 is fixed in the receiving device 28 by means of the fluid-actuable first clamping device 30, as already described in detail.

If a spreading device 78 is provided, it can be actuated after the plurality of needle modules 14 have been fixed. For this purpose, the spreading elements 80 are moved in the direction of the carrier plate 26, for example by tightening the screw connection 84, so that the receiving elements 50, 52 receive the plurality of needle modules 14 in the third direction X in a form-fitting manner between them.

If the setting device 88 is designed as a separate device, the method finally includes inserting the needle board 10 into the needling machine 2 . In order to position the entire needle board 10 correctly on the needle bar 8, after the needle board 10 has been inserted into the needling machine 2 and before the second clamping device 34 is actuated, the method can also include the step of moving the needle bar 8 in the puncture direction E in order to insert it through a Hub to align the needles 12 and thus the needle board 10 on the hold-down plate 20 and/or the needle plate 18. The needle board 10 is thereby correctly positioned on the needle bar 8 and can then be fixed on the needle bar 8 by actuating the second clamping device 34 .

In addition, adjusting screws (not shown) can be provided in order to align the segments of the needle board 10 arranged on the needle bar 8 or the several needle boards 10 arranged on the needle bar 8 with one another in the case of segmented needle boards 10 or several needle boards 10 on the same needle bar 8, in particular in the direction Z, to ensure.

The present invention consequently provides a needle board and a method which, taking into account the dimensional deviations of the components of the needle board, enable correct positioning of the plurality of needles 12 of a needle bar 8 and thus a very high needle density.

Claims (16)

Needle board (10) for attachment to a needle bar (8) of a needling machine (2), which is used to strengthen a fibrous web (4), the needle board (10) having: a carrier plate (26) with a receiving device (28) in which a plurality of needle modules (14) arranged in a row is accommodated, each needle module (14) of the plurality of needle modules (14) having a plurality of needles (12), and a fluid-actuable clamping device (30) which is set up to fix the plurality of needle modules (14) in the receiving device (28) at least in a first direction (Y). Needle board (10) according to Claim 1, characterized in that the clamping device (30) is set up to bring about a holding force on the plurality of needle modules (14) and/or the receiving device (28) at least in the first direction (Y) and thereby preferably fixing the plurality of needle modules (14) positively in the first direction (Y) and non-positively at least in a second direction (Z), which is oriented perpendicularly to the first direction (Y). Needle board (10) according to Claim 1 or 2, characterized in that the clamping device (30) comprises at least one clamping element (32, 32a, 32b) which has a first state in which the plurality of needle modules (14) in the receiving device ( 28) is movable and has a second state in which the at least one clamping element (32, 32a, 32b) is expanded compared to the first state and fixes the plurality of needle modules (14) in the receiving device (28). Needle board (10) according to Claim 3, characterized in that the at least one clamping element (32, 32a, 32b) is designed as a hose, preferably as a compressed air hose. Needle board (10) according to Claim 3 or 4, characterized in that the at least one clamping element (32, 32a, 32b) is received in the receiving device (28). Needle board (10) according to one of Claims 3 to 5, characterized in that the receiving device (28) is movably mounted in the first direction (Y) relative to the carrier plate (26), the receiving device (28) being connected by means of the clamping device (30) is movable between a release position and a clamping position, the receiving device (28) being in the release position when the at least one clamping element (32, 32a, 32b) is in the first state, and the receiving device (28) being in the clamping position when the at least one clamping element (32, 32a, 32b) is in the second state. Needle board (10) according to one of the preceding claims, characterized in that the receiving device (28) comprises a first and a second receiving element (50, 52) which lie opposite one another and between them the clamping device (30) and the plurality of needle modules (14 ) with the needles (12) of the plurality of needle modules (14) extending out of the receiving device (28). The needle board (10) according to claim 2, characterized in that the clamping device (30) acts on the receiving device (28) and the needle board (10) further comprises a fluid-actuable release device (66) arranged to act in a direction opposite to the holding force to cause a counter force on the receiving device (28) in order to release the plurality of needle modules (14) in the receiving device (28). Needle board (10) according to Claim 8, characterized in that the needle board (10) comprises a plurality of layers arranged one above the other, the carrier plate (26) forming a first layer of the plurality of layers, the release device (66) having at least one pressure element ( 68, 68a, 68b) sandwiched between two layers of the plurality of layers of the needle board (10). The needle board (10) of claim 9, characterized in that the plurality of layers further includes a further panel (74) forming a second layer of the plurality of layers, the further panel (74) and the backing panel (26) being spaced from one another are arranged and receive the at least one pressure element (68, 68a, 68b) between them. Needle board (10) according to Claim 9 or 10, characterized in that the release device (66) comprises at least one transmission element (70), the at least one pressure element (68, 68a, 68b) being pressed onto the receiving device by means of the at least one transmission element (70). (28) works. Needle board (10) according to Claim 2, characterized in that the needle board (10) has a spreading device (78) which is set up to move at least in a third direction (X) which is perpendicular to the first and to the second direction (Y, Z ) is aligned to bring about a securing force on the receiving device (28) in order to positively define the plurality of needle modules (14) in the third direction (X) in the receiving device (28). Needling machine (2) for needling a fibrous web (4) with: a needle bar assembly (6) comprising a needle bar (8) and at least one needle board (10) according to any one of claims 1 to 12 attached to the needle bar (8); and a first main shaft (22) on which a first main connecting rod (24) is eccentrically mounted, which articulately connects the first main shaft (22) to the needle bar assembly (6). Needling machine (2) according to Claim 13, characterized in that the needling machine (2) comprises a further fluid-actuated clamping device (34) which is set up to fasten the at least one needle board (10) to the needle bar (8). Method for equipping a needle board (10), which is provided for attachment to a needle bar (8) of a needling machine (2), comprising the following steps: Inserting a plurality of needle modules (14) into a receiving device (28) which is attached to a carrier plate (26) of the needle board (10), needles (12) of the plurality of needle modules (14) moving in a first direction (Y) extend and the needle modules (14) of the plurality of needle modules (14) are arranged one behind the other in the receiving device (28) in a second direction (Z) which is oriented perpendicularly to the first direction (Y) and are movable relative to one another; Generating a relative movement between the needle board (10) and an adjustment device (88), the adjustment device (88) comprising a plurality of adjustment elements (90) which are arranged parallel to one another and extend in a third direction (X) which is perpendicular to the first and second direction (Y, Z); aligning the plurality of needles (12) on the plurality of adjusters (90) by relative movement between the needle board (10) and the adjuster (88); Securing the plurality of needle modules (14) in the receiving device (28) after the alignment by means of a fluid-actuable clamping device (30). The method of claim 15, characterized in that fixing the plurality of needle modules (14) comprises: Generating a holding force in the first direction (Y) on the plurality of needle modules (14) and/or the receiving device (28) by means of the clamping device (30); and positive fixing of the plurality of needle modules (14) in the first direction (Y) and non-positive fixing of the plurality of needle modules (14) at least in the second direction (Z) by the holding force.

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