WINDING MACHINE

The invention relates to a winding module (2) for a winding device for automatically winding coils for an electric machine, comprising a module structure (20), a needle carriage (24) having a needle (25), wherein the needle carriage (24) is mounted in the module structure (20) such that it can move along a first direction (R). The winding module (2) has a winding material clamping device (240) for clamping the winding material (8), which is designed to secure the winding material (8) against rotation and against shifting along the needle axis (250), wherein the winding material clamping device (240) is arranged in or on the needle carriage (24). The invention also relates to a module frame and a winding device having a module (2) of this type.

TECHNICAL FIELD

The present invention relates to a winding module and a module frame and a winding device having at least one winding module for winding coils for electrical machines.

PRIOR ART

Winding modules and winding machines are known. Thus, for example, it is known that a winding device which has a plurality of winding stations is used and that winding members are simultaneously wound with the needle winding technique.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a winding module which allows an improved winding method.

This object is achieved by the winding module according to claim1. Accordingly, a winding module for a winding device for automatically winding winding material is proposed. The winding material is in particular wire, for example, copper wire, of typical diameters, but particularly also diameters of 1 mm and more. The winding material is wound in this instance on a winding member, in particular in grooves of the winding member, in order to produce a coil for an electrical machine.

The winding module comprises a module stand. The module stand forms the frame of the winding module, in which the components of the winding module are received.

The winding module further comprises a needle carriage with a winding needle. The needle carriage is the carrier which carries the needle, wherein the needle is preferably releasably fastened in a fixed manner on or in the needle carriage. The releasability allows simple exchange of the needle. The needle is also referred to as a winding nozzle. The winding material is discharged in the direction of the winding member from the mouth opening thereof. The needle carriage is supported in the module stand in a displaceable manner in a first direction (Z stroke direction). The first direction is preferably the vertical direction during the correct winding use of the winding module, and therefore extends in the direction of gravitational force. However, it is also possible for the first direction to be located differently in space.

The above-mentioned object is now achieved in that the winding module further has a winding material clamping device for clamping the winding material which is configured in order to secure the winding material to prevent torsion about and to prevent displacement along the needle axis (or a longitudinal extent of the winding material) and this winding material clamping device is arranged in or on the needle carriage.

The winding material clamping device can be activated selectively so that it forms a rotation prevention member which prevents the winding material from rotating about its own axis with the rotation prevention member activated. The winding material clamping device further acts at the same time as a slip prevention member which prevents the winding material from moving in an undesirable manner in the longitudinal direction thereof in the winding material channel if the winding material clamping device is activated. Consequently, optimum control of the winding material during the winding process is provided. Typically, the winding material clamping device is activated at times between the winding phases in which the winding material is discharged out of the needle. During the winding phases, it is typically deactivated in order not to disrupt the running of the winding material.

The present invention is based on the recognition that the winding material clamping device can be integrated directly into the needle carriage, and therefore also moves during the winding with the needle carrier. This allows a particularly lightweight construction type, whereby a rapid winding runner can be produced. In particular, this clamping device no longer has to be fitted on an additional external axle, whereby weight and costs are saved.

The present invention particularly also allows a large number of rotors and/or stators to be wound at the same time with a plurality of teeth, wherein each tooth is preferably wound in sequence. The present invention is also advantageous if it is desirable to wind wire diameters of more than 1 mm.

In a preferred embodiment, the winding material clamping device has a clamping lever which is supported on or in the needle carriage. The clamping lever is movable between a clamping position and a release position. Preferably, the lever is fixed to a lever bearing and is pivotable. In the clamping position, that is to say, with the winding material clamping device activated, the clamping lever is pivoted in such a manner that it engages with the winding material which is located in the winding material channel and securely clamps it correctly. In the release position, the clamping lever is pivoted in such a manner that it releases the winding material during correct use so that it can be discharged by the needle to the winding member.

In a preferred development, the clamping lever is constructed as a two-armed lever. Preferably, the two lever arms are located in a manner inclined or angled relative to each other and particularly form an L-shaped lever. The L-shaped lever allows a compact construction with relatively long lever arms, which is optimum for the force redirection. Other lever shapes, such as, for example, a linear two-armed lever or a one-armed lever are also conceivable. Even a plurality of clamping levers can be provided.

In a development, the clamping lever is movable via a lever actuator.

The L-shaped clamping lever is particularly preferable wherein the lever actuator is surrounded at two sides by the L-shaped lever. In other words: preferably, the lever actuator is arranged between the two lever arms. This allows a particularly compact construction type.

In a preferred embodiment, the lever actuator has a movably supported eccentric element. Preferably, the eccentric element is supported in or on the needle carriage by means of an axle rotatably about the axle. The eccentrically projecting portion can then act on a lever arm of the lever in accordance with the rotary position. If the lever arm is itself supported on an axle, the lever arm can thus be pivoted by the eccentric element.

The return movement relative to this clamping lever movement which is caused by the eccentric element can, for example, be brought about by a resilient element, against which the eccentric element preferably acts indirectly via the lever. The clamping lever and/or the eccentric element can therefore be pretensioned, in particular in the clamping position, by means of a tensioning device. The tensioning device may have a resilient element, in particular a pressure spring and/or tension spring element, preferably a helical spring.

Preferably, this resilient element is adjustable. For example, there may be provided an adjustment screw in order to adjust the tension of the spring. As a result of the adjustability, it is possible for the winding material clamping device to be adjusted in a suitable manner with respect to the winding material, for example, the winding material diameter and/or the tension on the winding material. This is particularly the case when the pretensioned position is the clamping position and the actuation of the lever actuator brings about the movement into the release position. Other adjustment mechanisms can naturally also be used.

The lever actuator may preferably be actuatable via a hydraulic device, preferably a pneumatic cylinder, for moving the clamping lever. Other actuators, such as servo motors or magnetic actuators, can also be used in order to bring about the movement of the lever between the clamping position and the release position.

Alternatively, the winding material clamping device may also carry out the clamping engagement when the winding material clamping device is activated with a cylinder or a set of pincers or other means or clamping elements. The clamping elements are preferably pretensioned with respect to a movement direction so that only the other movement direction has to be actively brought about.

In a development, the needle carriage has a winding material channel which is preferably closed in a radially circumferential manner in order to guide the winding material through the needle carriage to the needle. Preferably, this winding channel extends centrally through the needle carriage. The term “centrally” is intended to be understood in this instance to mean that the winding material channel extends symmetrically with respect to a guided width, that is to say, for example, substantially centrally between any guide rails for the needle carriage and/or substantially centrally with respect to a guided height of the needle carriage in the direction of the guide rails (Z direction).

The guided height/width is intended to be understood to mean the distance between the outer support locations of the carriage with the guide; any overhang (that is to say, what extends behind the guide) is disregarded. If the carriage is a plate, therefore, which is guided along the thickness, a construction on the plate which projects freely and which does not have any direct contact with the guide does not count toward the guided height.

As a result of this central arrangement, that is to say, the central arrangement with respect to the guided width and/or height, the forces which are applied by the winding material during the winding to the needle carriage and consequently to the winding module can be optimally taken up. These forces act symmetrically with respect to the displaceable needle carriage. As a result, only minimal torques act on the needle carriage. The tendency to tip is minimized, which allows a particularly advantageous travel movement.

In a preferred embodiment of the winding module, the module stand has a guide device, wherein the needle carriage is guided on the guide device in the first direction. The guide device can preferably have at least one, preferably two or more, guide rail(s) which is/are opposite with respect to the needle carriage transversely to the first direction and which preferably extend(s) in the first direction. The needle carriage can be displaceably supported on these guide rails. Preferably, the needle carriage has for each guide rail a through-recess, through which the guide rail extends. As a result, a circumferentially closed enclosure of the guide rail is provided by the needle carriage, which allows a particularly precise and robust guiding. Preferably, the needle carriage engages on the guide rail via sliding, rolling or other suitable bearings and is thus displaceable in a low-friction manner.

In order to activate the winding material clamping device, the winding module further has a torque shaft in a preferred embodiment. A rotary movement from the outer side can be introduced into the winding module via this torque shaft and leads to the activation of the lever actuator, therefore in preferred embodiments to the rotation of the eccentric element.

The torque shaft preferably extends parallel with the at least one guide rail. The torque shaft itself can also provide a guiding action for the travel movement of the needle carriage. Preferably, the torque shaft is guided through the needle carriage. Preferably, the torque shaft extends substantially over the length of the at least one guide rail. As a result, the lever actuator which is displaceable in the needle carriage over the length of the guide rail(s) can be activated over substantially the entire travel path.

The present invention further relates to a module frame in which a plurality of the winding modules according to the invention can be inserted. To this end, the module frame has a large number of receiving members, preferably 2, 3, 4, 5, 6, 7, 8 or more receiving members for winding modules, wherein preferably at least one winding module is inserted in the module frame. Preferably, an even number of receiving members is provided. The receiving members are configured to releasably fix the plurality of winding modules. For each winding application, the suitable number of modules can readily be inserted. This modularity allows a particularly versatile use of the module frame or module or the winding device as a whole.

The module frame is a fixed frame for mounting a plurality of winding modules for the simultaneous winding of a plurality of coils. As a result of the fixed spatial connection of the inserted winding modules, the module frame can then be moved as a whole in order to bring about an additional stroke movement, the Y stroke, in addition to the needle carriage movement (Z stroke). Preferably, the Z direction and the Y direction are substantially perpendicular to each other. In particular, the Z direction can extend in the vertical direction (for example, in the direction of gravitational force) and the Y direction can extend in the horizontal direction (as, for example, along the winding table).

For the purposes of the present description, therefore, the movement of the needle carriage in the module frame is referred to as the Z stroke movement, and the movement of the module frame is referred to as the Y stroke movement. The third spatial direction movement (X stroke movement) can then be carried out, for example, by a switching unit which can bring about a rotational movement about the Z axis. The Y and Z stroke directions and preferably also the X stroke direction are preferably substantially perpendicular to each other, respectively.

The present invention is particularly suitable for a needle winding technique. However, other techniques can also be used.

In a development, the module frame comprises a single rotation element or at least a pair comprising a first and a second rotation element. The rotation element can be coupled to any winding module so that a rotational movement of the at least one rotation element can be converted into the travel movement of any carriage (Z stroke) which is located in the module frame. Therefore, the rotational movement of the single rotation element or at least one pair comprising a first and a second rotation element can be introduced into the winding module via the coupling.

Preferably, in the development of the module frame with a pair comprising rotation elements, the first and second rotation elements of the pair are supported in a rotatable manner on or in the module frame with spacing from each other in the first direction, preferably substantially over a height of the winding module. Thus, for example, the rotational movement can be introduced from the module frame from below and from above into the winding module.

In a development, the module frame further has a coupling device which converts the rotational movement of the single rotation element or the pair of rotation elements into the travel movement of the at least one needle carriage which is located in the module frame. Accordingly, the coupling device is coupled in terms of movement to the single rotation element or coupled in terms of movement to at least one rotation element of the at least one pair comprising a first and second rotation element, wherein the coupling device is further connected in terms of movement to the needle carriage so that the needle carriage can be moved in the first direction via the rotational movement of the single rotation element or the at least one rotation element of the at least one pair comprising a first and second rotation element. In this case, the coupling of the needle carriage and the connection device is preferably readily releasable in order to assemble the winding module rapidly in the frame and disassemble it again.

It is particularly preferable in the embodiments with a pair of rotation elements for the rotational movement of the first and second rotation element of the pair to be coupled, for example, by a synchronization drive, such as a thread or a belt drive. A synchronous and cleanly guided movement is thereby possible, which helps to achieve a particularly high winding speed.

In a development of the module frame, the first rotation element is a first shaft or a first disk which is supported on a first shaft, in particular a toothed disk, and the second rotation element is a second shaft or a second disk which is supported on a second shaft, in particular a toothed disk. The coupling device can then be configured as a belt drive and may further have a carriage belt for forming a belt drive with the first and second rotation element.

The carriage belt is preferably configured as a toothed belt and the first and second rotation elements of the pair are preferably configured as toothed disks; together, they form a toothed belt drive.

It is particularly preferable for the module frame to have one or two shaft(s), wherein on each shaft one disk per winding module receiving member is provided. Via this disk, the rotational movement of the single rotation element or the pair of rotation elements can then be coupled from the frame into the module, which leads to the linear Z movement of the needle carriage.

A configuration with two shafts and accordingly one disk per shaft for each winding module or each receiving member is particularly preferable, wherein the carriage belt forms a belt drive with these two belts. In this case, first and second belt ends can preferably be fixed via clamping plates to the first or second rotation element (therefore, to the shaft or the disks which are fitted to the shaft in a rotationally secure manner).

The carriage belt preferably extends in the first direction. As a result, a particularly simple conversion of the rotational movement of the at least one rotation element into the linear movement of the needle carriage is possible.

The open belt allows simple coupling of the needle carriage to the belt drive. In particular, the belt has to be guided only once by or on the carriage. In particular, the winding material has to be guided only once by the belt with an open belt. For the purpose of simple disassembly of the module from the module frame, the belt can be releasably fixed directly to the needle carriage. The open belt can in particular be releasably fixed to the needle carriage via a clamping plate integrated in the needle carriage so that the belt can be disconnected simply by releasing the clamping plate from the needle carriage.

In a development, therefore, the carriage belt is releasably fixed to the needle carriage, preferably via a clamping plate which is fitted to the needle carriage. Other possible fixing means are also conceivable.

In order to obtain a movement of the needle carriages which is as synchronous as possible, it is preferable for all the single rotation elements and/or the first and second rotation elements to be driven, preferably via at least a first servo motor or via precisely one single first servo motor. The movement can further be made uniform by the provision of synchronization drives. Thus, for example, in modules with two shafts the two shafts can be coupled via a synchronization drive, for example, at least one additional belt drive. These synchronization drives can preferably be provided at the end of the shafts on the module frame.

Therefore, a module frame is preferable wherein the first and second shafts are connected in a rotationally secure manner via at least one additional synchronization device, preferably in such a manner that the shafts rotate in the same direction; and wherein the synchronization device preferably has a synchronization belt which is preferably configured as a toothed belt.

In a preferred embodiment, therefore, the Z stroke of all the winding modules inserted can be brought about via a single first servo motor.

The single first servo motor is preferably coupled via a first belt drive to the/the first rotation element(s) and preferably via a second belt drive to the/the second rotation element(s), if present.

The belt drives which are mentioned herein preferably have a tension disk, via which the tension of the belt can be adjusted.

In principle, the belt drives mentioned herein can also be replaced by toothed wheel gear mechanisms, push rods or other movement transmission elements.

An object of the present invention is to provide a winding device which allows an improved winding of coils, preferably using the needle winding technique.

This object is achieved by the features of claim13. Accordingly, there is proposed a winding device for automatically winding, preferably using the needle winding technique, winding material, in particular wire in grooves of a winding member, in order to produce a coil for an electrical machine, in particular an armature or externally grooved stator. The winding device comprises a machine frame, a table plate having at least one switching unit for receiving and switching (X stroke) the winding member, and a module frame according to the invention (for the synchronous Y stroke, see below), as described herein, wherein the at least one winding module according to the invention (which allows the Z stroke), as described herein, is preferably fixed in the module frame in such a manner that the first direction (Z) is perpendicular to the second direction (Y). Since the switching unit preferably causes a rotational movement of the winding member perpendicularly to the table plate, that is to say, in the Z direction, the X stroke is then substantially perpendicular to the Y stroke and Z stroke.

In a development of the winding device, the module frame is movable relative to the table plate in a second direction and thus all the winding modules which are fixed in the module frame are movable in the second direction (Y stroke).

Preferably, the winding device has at least one, preferably precisely one single, second servo motor for moving the module frame in the second direction.

According to a particularly preferred embodiment, therefore, a single first servo motor for bringing about the Z stroke (of each winding module) and a single second servo motor for bringing about the Y stroke (entire module frame) are provided. This allows an easy, cost-effective and reliable construction of the winding device. The X stroke can then be brought about via one or more third servo motors. Therefore, one or more third servo motors can be provided, wherein, in the case of a plurality of third servo motors with each third servo motor at least one, preferably precisely two or more, switching unit(s) can be switched at the same time (for example, via a coupling by means of a belt drive).

According to a development of the winding device, there are provided 2, 3, 4, 5, 6, 7, 8 or more preferably individually removable winding modules in the same module frame, wherein preferably an even number of 2, 4, 6, 8 or more winding modules are or can be fixed in the module frame.

In a preferred development of the winding device, a plurality or all of the winding material clamping devices which are received in the respective needle carriages of the winding modules are coupled to each other, preferably coupled in terms of movement via a push rod. It is particularly preferable for a plurality or all of the winding material clamping devices to be actuatable via one, preferably the same, hydraulic device, preferably a hydraulic, in particular pneumatic, cylinder. However, other actuation devices are also conceivable in this instance, for example, a Bowden cable or electric motors. According to the present invention, the winding module according to the invention, the module frame according to the invention and the winding device according to the invention can be used to wind coils, in particular armatures or externally grooved stators, for an electrical machine. In this case, there is preferably used as the winding material wire, in particular wire having a diameter of from 0.5 mm to 2 mm, preferably of more than 1 mm, preferably from 1 mm to 1.5 mm.

DESCRIPTION OF PREFERRED EMBODIMENTS

With reference toFIGS. 1 to 11, preferred embodiments of the present invention will now be described. In this instance, metal wire8is used as the winding material.

FIG. 1shows a winding device1having a machine frame10. The winding device1further has a control cabinet41, a wire supply42, a wire clamping and cutting unit43for suspending the wire in commutators7, a loading handling unit44and a switching unit6. Furthermore, the winding device1has a module frame12having a large number of winding modules2.

The machine frame10is welded and assembled from square steel pipes. A table plate11which acts as a base for additional functional groups is fitted in the machine frame10. The machine frame10is partially provided with a safety sheeting101. The safety sheeting101may comprise grooved profiles of aluminum. Doors are secured with door protection retention members. Other constructions are possible.

The control cabinet41has an operating panel for operating the winding device1. The control cabinet41is integrated at the rear side in the machine frame10. The operating panel411is rotatably suspended on a boom412in front of the winding device101.

FIG. 2is a cross-section through the winding device1according toFIG. 1. In the foreground (bottom right), one of the winding modules2can be seen and is fitted in the module frame12. The module frame12is itself supported on the table11in the machine frame10. The module frame12is arranged in a linearly displaceable manner on a guide device46(Y stroke). A first guide rail461of the guide device46can be seen inFIG. 2, which rail461extends in the Y direction.

The loading handling unit44is shown above the module frame12. The loading handling unit44has two laterally arranged supports441on which there is provided a runner441which extends transversely relative to the support441. The loading handling unit44has two supports441which are arranged laterally in the winding device1on the table11and which each have an extension arm442. The extension arms442are arranged parallel with each other and are freely movable via two servo motors in two axes. The synchronization of the two extension arms442is carried out via a drive rod in the drive axle of the motors. The movement of the extension arms442is brought about via a circumferential toothed belt443in a crosswise arrangement. This drive concept is also referred to as “T-bot”. A pneumatic rotary unit444is flange-mounted on the extension arm442at both sides. The receiving bar445, which is rotatably supported by means of the rotary units444for the product grippers446, is located between these rotary units444. Two grippers446are always arranged opposite each other per winding module2. This double gripper system allows loading and unloading in a state released from the winding process. The sequence is as follows: after a product7is completely wound with the coil5, one gripper446approaches, a tension unit is released, the handling unit44travels away upward, rotates through 180° and inserts the unwound product7with the other gripper446in the tension unit. This is carried out simultaneously for all the winding modules2. After the handling unit44has moved away, the winding process can be started. At the same time, the unloading of the wound stators onto a support45(waiting position) or a material carrier is now carried out.

FIG. 2further shows a portion of the wire clamping and cutting unit43for suspending the wire8on commutators. The unit43is arranged above the winding module2. The unit43contains two main functions, that is to say (i) a clamping sleeve presses the start wire8via a vertical, pneumatic drive into a groove base of the first hook on the commutator so that the first windings can be wound; and (ii) via a horizontal, pneumatic drive, a blade receiving sleeve is moved in rotation via a toothed rack. Via a cutting edge of the outer sleeve, the wire8is separated and bent around the hook by the blade member. The wire end is thereby prevented from touching the wire8in the adjacent hook.

FIG. 3shows the module frame12in a front view. The module frame12has two trapezoidal side walls which are connected to each other via a base plate and a strut which is arranged opposite and parallel with respect to the base plate. A first shaft121extends in the upper region between the side walls over the entire length of the module frame12. A second shaft122which also extends over the entire length of the module frame12is arranged with spacing from the first shaft121in the Z direction. The first shaft and second shaft121,122are connected to each other in a rotationally secure manner laterally via a synchronization drive128. To this end, disks which are arranged in a rotationally secure manner are fitted to each shaft121,122at the end in each case. Toothed disks of the synchronization drive128which are spaced apart from each other in the Z direction are now coupled in terms of movement via a closed toothed belt. A tension disk which ensures the correct tension of the belt of the belt drive128is provided centrally between the toothed disks which are connected via the belt drive.

Six equidistantly distributed winding modules2are arranged over the length of the frame12. The first shaft121and the second shaft122each have for each winding module2a first toothed disk123and second toothed disk124which are fitted in a rotationally secure manner on the shaft121,122, respectively. Therefore, there are provided on the first and second shafts121,122six first toothed disks123and six second toothed disks124. In embodiments having more or fewer receiving members for winding modules2, naturally a corresponding number of first and second toothed disks123,124can be provided. The receiving members on the module frame are therefore distinguished by the toothed disks and corresponding fixing means for fixing the respective module stand20.

Via a first servo motor51, which engages on the first shaft121via a first belt drive126and on the second shaft122via a second belt drive127, both shafts121,122are driven by motor and coupled in terms of movement via the synchronization drives128.

FIG. 4shows the module frame12in a rear view. It can be seen that module stands20of the winding modules2are each screwed to the base plate and to the upper strut of the frame12in the receiving members.

FIGS. 3 and 4further show that the module frame12is supported on the guide device46, which has the first guide rail461and the two additional rails462,463. The module frame12has travel units465which are associated with the guide rails461to463and on which the module frame12can then be moved on the rails461to463. In principle, fewer rails would naturally also be sufficient, in particular the two outer rails461,462provide a stable guide and the third guide rail463reduces the play further.

The module frame12is now moved in the Y direction via a second servo motor S2which engages on the module frame12via a rod464which extends in the Y direction and which makes it movable in the Y direction (Y stroke).

FIG. 5is a cross-section through the winding device1. The wire supply42, which is arranged on the table11of the machine frame10, can be seen. The wire supply42is provided with wire brakes and a wire compensation mechanism. The wire supply42supplies the wire via a guide hose. After a preliminary brake432, the wire8is wound around a Vulkollan-coated braking roller433of the magnetic powder brake (540°) and guided in a vertical direction around a first redirection roller434after a 90° redirection around a second redirection roller435and, from there, back to the compensation roller436. The compensation roller436is pressed against the winding module2on a guide carriage437in a horizontal direction by a pneumatic cylinder438with free-running properties. This compensation pressure is adjusted via a proportional valve via a control unit. Thus, it is ensured that during the winding process loose wire8is never produced and the wire drawing remains constant. The individual wire unrollers (not shown) are screwed behind the winding module2on the table plate11of the winding device1and are thus accessible for changing the wires in an optimum manner.

Furthermore, on the left-hand side,FIG. 5shows the module frame12and a winding module2with a module stand20, the first shaft121having the first toothed disk123is again arranged in the upper region of the winding module2and the second shaft122having the second toothed disk124is arranged in the lower region. The two toothed disks123,124are coupled in terms of movement via an open toothed belt1250of a connection device125, which belt extends in the Z direction. The toothed belt1250is fixed on the needle carriage24. The needle carriage24is further arranged between two guide rails261,262which are provided in the winding module2and are thus displaceable via movement of the shafts121,122along the guide rails261,262in the Z direction. The guide rails261,262are guided through the recesses246(through-openings) through the needle carriage24. The needle carriage24is provided in the region of the recesses246with bearings2460so that it is possible for the needle carriage24to slide along the guide26with as little friction as possible.

The winding member7, which is tensioned on the switching unit6, is located in front of the module2. The winding member7has a large number of teeth72which are separated via grooves72. The winding module2has a needle carriage24which is displaceable in the Z direction and which has a needle25, from which the wire8is inserted in the grooves71for winding round the teeth72, whereby the coil5is formed.

FIG. 6shows the winding module2in a perspective view from above.FIG. 7shows the winding module2in the frame12in a side view.

The substantially parallelepipedal module stand20having the central through-opening can be seen. The two guide rails261and262are laterally fitted. The needle carriage24is arranged so as to be displaceable in the Z direction between these rails261,262.

The needle carriage24has an additional through-opening for the introduction of a torque shaft2421. The torque shaft2421engages on a winding material clamping device240which is arranged in the needle carriage24.FIG. 6shows how the wire8is guided through an opening into the interior of the needle carriage and is discharged again at the opposite end by the needle25along the needle axis250(seeFIG. 7).

FIG. 7further shows the first belt drive126, via which the first servo motor S1engages on the first shaft121. The tension disk of the first belt drive126can also be seen.

The details of the connection device125can further be seen inFIG. 7. The first belt disk123having a tooth arrangement1231is connected to an upper portion1251of the toothed belt1250of the belt drive125via a clamping plate1222. The belt125is guided through the opening2470(seeFIG. 8) through the needle carriage24and securely clamped with the clamping plate247(see alsoFIGS. 6 and 8). In the lower region1252, the belt1250is connected to the lower second toothed disk124with a tooth arrangement1241via an additional clamping plate1222. In the situation according toFIG. 7, it can be seen that the belt1250is then already largely wound around the toothed disk124and engages with the tooth arrangement1253in the tooth arrangement1241of the disk124, and the needle carriage24is therefore located in a lower position.

FIGS. 6 and 7also show the clamping lever241of the winding material clamping device240.

FIGS. 8 and 9show a cross-section through the needle carriage24, whereby the winding material clamping device240can be seen. The winding material clamping device240has the clamping lever241, which can be pivoted as required via a lever actuator242. The winding material clamping device42further has an eccentric element242. The clamping lever241is a two-armed clamping lever having a first arm portion2411and a second arm portion2412. The lever241is constructed in an L-shaped manner and is arranged in a substantially L-shaped recess245in the needle carriage24centrally with respect to the Z direction. The lever241is pivotably supported on the lever bearing2413in the needle carriage24.

The clamping lever241interacts with the eccentric element242via the first arm portion2411. The eccentric element242is arranged in a rotationally secure manner on the torque shaft2421, which forms the axis of the eccentric element242. If the torque shaft2421is now rotated, the eccentric element242also rotates accordingly.FIGS. 8 and 9show that the eccentric element242is an eccentric disk which can press on the first lever portion2411depending on the rotation position with a thickened portion and can thus press the clamping lever241which is pretensioned in the clamping position into the release position.

Via the second arm portion2412, which extends substantially parallel with the winding material channel243, the clamping lever241can engage in the clamping position with any wire8which is introduced in the winding material channel243and can securely clamp it at that location so that it does not twist about its own axis or slip in the longitudinal direction thereof. To this end, the lever arm2412is provided with a clamping element2427which makes direct contact with the wire8. The abutments2428are provided opposite the clamping element2427so that an optimum clamping location in the needle carriage24can be provided. The second lever portion2412tapers toward the free end thereof. Furthermore, the engagement location of a resilient element2424is located at the free end of the lever arm2412for pretensioning the lever241in the clamping position. The resilient element2424is constructed as a pressure spring which can be adjusted in terms of the tension thereof via the adjustment screw2426.

FIG. 9also shows an inlet opening into and an outlet opening out of the needle carriage24, which openings are provided for the introduction of the wire8. The inlet opening and the outlet opening are connected by the winding material channel243. The winding material channel243extends substantially centrally between the two guide rails261,262and substantially centrally with respect to the Z extent of the needle carriage24. Torques on the needle carriage24are thereby minimized.

FIG. 10shows a hydraulic device3for moving the respective torque shafts2421. The torque shafts2421are connected at the lower end via L-shaped pieces331to a push rod33which extends parallel with the table11. This push rod33is connected via an articulation34to an actuation piston rod32which is supported in a pneumatic actuation cylinder31of the hydraulic device3. Therefore, with the actuation of the actuation cylinder31the push rod33is moved forward or backward with respect to the cylinder31so that the L-shaped connection pieces331and therefore the torque shaft4421are rotated. Accordingly, therefore, the eccentric elements2422of the mounted winding modules2can be rotated by the actuation of the hydraulic device3.

FIG. 11shows the switching unit6has a switching axle62and is supported by a double-row of ball bearings63in a receiving housing which is inserted in the table plate11. The drive is produced via a toothed belt drive61. A tension unit comprising a set of tensioning pincers is inserted in the receiving mandrel64. This set of tensioning pincers is configured for the shaft diameter of the winding member7and is tensioned via a disk spring assembly. In order to release this tension, pressure can be applied from below with a mandrel against the disk spring assembly. The set of tensioning pincers thereby opens because it is lifted off a cone. The switching axles62are driven in pairs via a toothed belt drive61. A third servo motor S3is fitted so as to be offset laterally centrally relative to the axles62. This switching unit6can now be fitted several times and allows machine variants with4,6or8winding spindles. In place of tensioning units with sets of tensioning pincers (tensioning of shafts), receiving members for stators can also be provided with tensioning mandrels (tensioning in holes).