Patent Application
20240199370
The present invention relates to a device for positioning a roller or for tensioning a belt that has at least one roller, at least one belt, in particular a running belt, at least one tension rod and at least one guide device. The invention further relates to a drawing device having a device according to the invention. The invention also relates to a spinning unit having a device according to the invention and/or a drawing device according to the invention. The invention further relates to a spinning machine having a device according to the invention and/or having a spinning unit according to the invention and/or a drawing device according to the invention.
In the textiles industry, a device for tensioning a belt in a drawing device is known, for example from EP 2 573 230 B1, in which a drawing device has a plurality of roller pairs, such as a rear roller pair, a middle roller pair and a front roller pair. The rollers are arranged in this order along a fiber bundle guide in a drawing direction of the fiber bundle. The drawing device has a first support portion which is configured to rotatably support a front bottom roller, has a second support portion which is designed to rotatably support a middle bottom roller, and also has a tension rod which is designed to regulate a tension and position of a running belt which is placed around the middle bottom roller, wherein a third support portion, which is arranged on at least one of the first support portion and the second support portion and protrudes therefrom and is designed to support the tension rod, wherein the third support portion is designed to support the tension rod by being inserted into a recess formed in the tension rod.
The running belt is subject to wear and, for this reason, has to be changed after a certain time. According to the prior art, changing the running belt is connected to a pause of the runtime of a spinning machine. The standstill of the spinning machine is thus associated with costs.
Starting from the aforementioned prior art, it is an object of the invention to improve and simplify the changing of the belt, to accelerate the changing as much as possible and thus to reduce the costs of changing the belt. Furthermore, it is an object of the invention to improve the repeatability of changing the belt in order to improve the overall changeover process.
The object is achieved by a device having the features of claim 1. The object is also achieved by a drawing device having the features of claim 10 and by a spinning unit having the features of claim 11. The object is further achieved by a spinning machine having the features of claim 13.
Advantageous embodiments of the invention are the subject matter of the dependent claims.
According to one aspect, the object is achieved by a device having the features of claim 1.
The device is designed for positioning at least one roller of a drawing device and/or a spinning unit. Alternatively or additionally, the device is designed for tensioning at least one belt of a drawing device. The belt can also be designed as a running belt, or referred to as a running belt or apron. Alternatively or additionally, the device is designed for tensioning a belt in at least one spinning unit. In the following, the device is referred to as a tensioning device irrespective of its purpose, whether it is provided for positioning the roller or for tensioning the belt. The tensioning device has at least one roller which is rotatably mounted. Furthermore, the tensioning device has at least one belt which is designed in particular as a running belt. Furthermore, the tensioning device has at least one tension rod and at least one guide device for contacting the belt at at least one contact point. The guide device serves to guide the belt during operation of the at least one roller (functional state, operating state). The tension rod and the roller are designed and arranged in such a way that the belt is arranged for operation in such a way that it runs around at least part of the roller in a contact region. Furthermore, the tension rod and the roller are designed and arranged in such a way as to arrange the belt for operation so that it runs around at least part of the tension rod. Furthermore, the tension rod and the roller are designed and arranged relative to each other in such a way that the belt runs around the tension rod and the roller in a tensioned manner when the at least one roller is in operation. The belt, in particular between the tension rod and the roller, can be guided by the at least one guide device during circulation. The at least one guide device is arranged in particular in such a way that the belt can be guided by the at least one guide device during circulation between a front end of the tension rod, which faces away from the roller in the direction of circulation, and a front end of the roller which faces the tension rod or the rear end of the tension rod in the direction of circulation. The at least one guide device is arranged and designed to make the roller, in particular in the form of a lower roller, reversibly accessible. This accessibility is thereby used in particular to remove the belt. Alternatively or additionally, the accessibility is used for threading the belt. In particular, the relative positions of the roller, tension rod and/or belt remain unchanged with respect to one another while making the roller accessible. This improves the positioning of the individual components after a belt change and facilitates the belt change. This reduces the holding time (standstill in a non-functional state) of a corresponding drawing device that is equipped with a corresponding tensioning device, and therefore also the holding time of a corresponding spinning machine. This saves resources and reduces costs.
A tensioning device is in particular the functional group consisting of the at least one roller which is rotatably mounted, the at least one belt, the at least one tension rod and the at least one guide device for contacting the belt at at least one contact point. The process of contacting the belt at the contact point serves in particular to guide the belt during operation of the at least one roller when it is circulating around at least part of the roller and around at least part of the tension rod. The tensioning device can also be designed as a drawing carriage and be designated accordingly. A drawing carriage can be one of several drawing carriages that arrange upper and lower rollers to form roller pairs, and, combined, several roller pairs arranged one behind the other in the drawing direction of a fiber bundle to draw the fiber bundle form a drawing device.
The roller can in particular be rotatably mounted in a bearing block. The bearing block can be made up of one part, two parts or multiple parts. In particular, it may thus be provided that a lower part is designed to hold a rotatable part of a roller guide. A corresponding upper part may be formed which can be mounted on the lower part such that the roller guide is rotatably mounted in the two concave, in particular, cylindrical cavities of the upper and lower parts. The roller can thereby rotate.
The roller (also known as a roll) can, in particular, be an actively driven roller, in particular a lower roller. Since the belt contacts the roller in a section when it is under tension, the belt can also be moved via the roller, which is why the belt can be a running belt. In a functional state, it can run around the at least one roller in the portion where it contacts the roller and can run around the tension rod in the portion where it contacts the tension rod.
The functional state is, in particular, the state which is provided and correspondingly designed to spin a yarn. For this purpose, a fiber bundle is drawn in a drawing device, in particular by passing it through a series of roller pairs (arranged on the drawing carriages described above). In particular, at least three pairs of rollers (per three drawing carriages, especially at the top and bottom) can be arranged, through which the fiber bundle passes one after the other. In a portion, a belt can be wound around the (middle) lower roller or accordingly around a (middle) top roller.
Operation takes place in particular in this functional state. The functional state is designed for positioning the at least one roller by the belt, in particular the running belt, being designed and arranged for exerting a tension on the roller, by the belt, in particular the running belt, being further designed and arranged to run around a portion of the roller and a portion of the tension rod such that a tension is transferred from the tension rod to the roller or vice versa via the belt, in particular the running belt. In particular, this also tensions the belt.
The tension and position of the belt (a position in a direction parallel to a drawing direction, in other words, a drawing position in the drawing direction, and a position in a direction perpendicular to the drawing direction, in other words, a longitudinal position in the longitudinal direction) are regulated, in particular by the tension rod and/or roller. Thus, a mounted state of the tension rod or of the roller influences the tension and the position of the belt running around the tension rod and the roller. If the tension and/or the position of the belt should change, a drawing state of a fiber bundle, which passes between the upper and lower rollers in the functional state, changes. This can cause, for example, a thickness irregularity to occurs in the fiber bundle being drawn by a drawing device influencing the quality of the fiber bundle. The belt may also be called an apron.
The tension rod may be provided and designed such as to regulate the tension and/or the position of the belt, a portion of which, as described in detail, runs around the at least one roller, in particular in the form of a (middle) lower roller, and which belt contacts said roller and tensions it. While a tension rod is mentioned here, it does not necessarily have to have a cylindrical shape. It also does not have to have a round or oval (partial) cross-section. Rather, the tension rod may also be a cuboid structure, which is also, in particular, provided with belt contact regions and belt contact edges. The tension rod can therefore also be referred to as a bridge or tension rail.
Alternatively or additionally, the roller or the bearing of the roller can be provided and designed in such a way as to regulate the tension and position of the belt. In particular, the position of the roller or the bearing of the roller for positioning the roller in the drawing direction can be designed to be adjustable in a defined manner. In other words, the belt can be tensioned as required in a state in which it runs around the tension rod and the roller as described above via an adjustable, specifically variable, relative position of the tension rod with respect to the roller, or vice versa.
The belt contact region and/or the belt contact edge may be arranged and designed such that the belt runs around the tension rod as gently as possible, even if tension is exerted on the belt and said belt slides over the tension rod as a running belt.
In other words, tension can also be a (material) tension which is introduced into the belt by moving the tension rod away, relative to the at least one roller. In other words, it can thus also be said that the belt is tensioned.
Between the at least one roller, which is tensioned by the belt, and another roller, in particular in the form of a corresponding top roller, there may be room to maneuver. It may be provided that this clearance is tightened accordingly by the tension of the belt, corresponding to the tension transferred onto the belt by means of the tension rod. In other words, this means the tension can provide fine positioning of the at least one roller with respect to at least one other roller by means of a tension rod to adjust the quality of the fiber bundle during drawing. Alternatively or additionally, the belt is in contact with the fiber bundle to be drawn (not necessarily the roller around which the belt runs), as a result of which the tension of the belt also directly influences the process of drawing the fiber bundle, since fine adjustment of the process of drawing the belt corresponds to a fine adjustment of the contact behavior as the fiber passes by.
A non-functional state is, in particular, a state in which no fiber bundle can run through the arrangement of the roller pairs (also known as pairs of rollers). A non-functional state can be configured such that the belt is removed from the tensioning device and therefore fiber bundle drawing cannot be performed. In particular, a non-functional state is a state which allows the belt to be removed from the tension rod and/or from the roller, in particular, to exchange it. In other words, a non-functional state can thus also be understood to mean a repair state and/or a belt change state. Alternatively, the state can also be referred to as a maintenance state.
A drawing device can comprise a plurality of tensioning devices, in particular an upper and a lower tensioning device, for example for a front, middle lower roller or a front, middle upper roller. These can form a main drafting zone which is the region in a drawing device where a fiber bundle is drawn at high draft values in preparation for spinning a yarn. A drawing device can be formed by a plurality of drawing carriages which each represent upper and/lower drawing carriages and therefore form a roller pair arrangement as previously described.
The fibers of the fiber bundle lose their cohesion in particular in this main drawing zone. The drawing device, also referred to as a drawing frame, can therefore be designed in particular as a belt drawing frame of the type described at the outset. In this case, the fiber bundle is guided in particular between the clamping lines of two rollers, a so-called roller pair, by the belts of the tensioning devices. The drawing device can be designed as a so-called double-belt drawing frame in which two tensioning devices as described above can be arranged opposite each other in the region of the main drafting zone, wherein a belt is guided by an upper and a lower roller in each case and can be deflected toward the second roller pair by a deflection device from the fiber guiding direction into the return direction so that the fiber bundle is guided between the upper and lower belts.
The belts are in particular designed as endless belts which are guided in particular around the drivable roller, in particular the drivable lower roller, and the tension rod. In particular, the tension rod holds the belt, in particular the lower belt, at the pretension required for operation, as described above. The belt can be driven in particular via the drivable roller, wherein the drive torque can usually be transmitted from the roller to the belt via a frictional connection with an opposite belt, in particular an upper belt or an upper roller.
A guide device can be designed to guide the belt, in particular laterally. This guidance in particular influences the quality of the spun yarn. Advantageous fiber guidance of the fiber bundle or an advantageous drafting quality are responsible for a uniformly spun yarn by uniformly drafting the fiber bundle. Due to the main draft in a belt drawing frame, in particular in the region of the belt guide, correct guidance of the belt in this region is of decisive importance.
The guide device is in particular designed in such a way that the belt is guided laterally in order to prevent the belt from traveling across the roller and/or the tension rod. This also allows the corresponding counterpressure to be achieved in a main drafting zone as described in detail.
The interaction with the guide device also contributes in particular to the wear of the belt. However, this contribution is less than the contribution to wear made by the roller and the tension rod and by interaction with the fiber bundle.
Therefore, in particular, wear of the belt due to interaction with the fiber bundle to be drawn as well as due to abrasive contact with the tension rod has a negative effect on the quality of the fiber bundle. For this reason, the belt must be changed after a certain amount of time. The process of changing the belt should be made very easy and must also lead to particularly reproducible threading of the belt in order to ensure the reproducible quality of the resulting fiber bundles.
Removing the belt and threading the belt can be used in particular to replace an old, worn belt with a new, unused belt. As far as possible, the relative positions of the roller, tension rod and/or belt to each other should remain unchanged in order to ensure corresponding reproducible quality, or the belt change should result in a reproducible relative position.
At least one guide device can be provided which is arranged and designed in particular in such a way as to make the roller reversibly accessible without changing the relative positions of the belt, the roller and the tension rod when making said roller accessible. As a result, the belt can be removed (only the relative position of at least the belt, ideally only the belt to the roller and tension rod) by moving and/or removing the guide device in order to subsequently remove or thread the belt. In other words, this means that the relative position of the roller, tension rod and belt is not changed when the roller is made accessible, but only when the belt is removed. In this case, the relative positions of the roller and the tension rod relative to one another can also be maintained while removing or while threading the new belt.
In this case, the guide device of the tensioning device is further designed and arranged in particular in such a way that the at least one belt can be removed from the tensioning device without having to cut the belt. It is also possible to remove the belt without removing the corresponding roller (from the device). In particular, the tension rod does not have to be moved, loosened and/or removed either. The corresponding components and/or assemblies thereby remain in particular in the device. For this reason, somewhat time-consuming reassembly, especially with subsequent fine adjustment of the roller and/or tension rod, can be avoided. Replacing the belt is also easier.
The guide device can in particular be moved in such a way that the roller, in particular the lower roller and/or the upper roller, is accessible in order to pull the belt off the roller and off the tension rod without changing the relative position of these three relative to one another when the corresponding roller is exposed. This increases the reproducibility of the belt replacement process, reduces the duration of the non-functional state and therefore the downtime of the device, which has a direct beneficial effect on the costs of operating the machine.
According to one aspect, the guide device can be arranged and designed in such a way as to interrupt the contact between the guide device and the at least one belt. In this case, the at least one roller, the at least one belt and the at least one tension rod can be designed and arranged in such a way as to retain their positions relative to one another when the contact between the guide device and the belt is interrupted. In particular, a belt change is thereby facilitated because the roller becomes more easily accessible. This also saves resources, which has a positive effect on the costs of changing the belt.
The interruption of the contact is to be understood here in particular in that the contact point described in detail or a contact region between the belt and the guide device is released.
In other words, this means that the guide device can be arranged so as to be movable relative to the arrangement consisting of the roller, tension rod and belt. It is therefore the guide device that is moved and not one, or even all, of the other components, in order to make the roller accessible, in particular to allow the belt to be (more easily) changed.
According to a further aspect, the guide device can be arranged to be reversibly removable relative to at least one of the at least one roller, the at least one belt and/or the at least one tension rod in order to remove the guide device so that the belt can be removed from the tension rod and/or roller, wherein the relative position between the guide device, the belt and the roller is maintained when the guide device is removed. This makes it possible to dismantle the guide device, which in turn simplifies belt replacement.
Alternatively or simultaneously, the guide device can be reversibly mountable relative to at least one of the roller, the belt and/or the tension rod in such a way that the guide device (i.e., also the guide element) can be mounted after the belt has been threaded onto the tension rod and/or the roller. This means that mounting takes place after threading. In particular, the relative position between the guide device, the belt and the roller is maintained when the guide device is mounted. This makes it possible to mount the guide device which makes it easier to change the belt.
Here, “alternatively” refers to the fact that mounting or removal can take place. “Simultaneously” is intended to make it clear that the guide device and the tensioning device are designed and arranged for reversible removal (reversible therefore means that there is a remounting step). According to this aspect, the guide device is therefore not only moved, but in particular a physical disassembly process occurs, for example in the form of a physical disconnection from a mounting point at which the guide device is arranged.
According to a further aspect, the roller can be rotatably mounted in a bearing block. In this case, the bearing block and the guide device form a functional unit which is designed and arranged in such a way that, when the functional unit is mounted, the belt is contacted at a contact point by the guide device. A simple assembly consisting of a bearing block and guide device therefore enables corresponding contacting of the belt and guidance of the belt that this initiates. This simplifies the production of the contact and in particular improves the reproducibility of the guidance.
The function described here is therefore a process of bringing the guide element into contact with the belt. In particular, the belt is pulled onto the roller and tension rod in such a way that contact with the guide element is ensured.
According to a further aspect, the bearing block is designed to be at least partially removable in order to remove part of the bearing block from the functional unit in order to interrupt the contact between the guide device and the belt.
Alternatively or simultaneously, the removable part of the functional unit of the bearing block can be mounted in such a way as to mount the removable part of the bearing block in the functional unit in order to establish the contact between the guide device and the belt after the belt has been threaded onto the tension rod and/or the roller.
Here, “alternatively” refers to the fact that mounting or removal can take place. “Simultaneously” is intended to make it clear that the guide device and the tensioning device are designed and arranged for reversible removal (reversible therefore means that there is a remounting step). According to this aspect, the guide device is physically removed together with part of the bearing block, for example in the form of a physical separation from a mounting point of the functional unit on which the functional unit and/or the guide device is/are arranged. In this case, the bearing block can be designed in two parts or in multiple parts, in particular in such a way that part of the bearing block can be removed together with the guide device in order to make the roller, which is rotatably mounted in the bearing block, accessible.
According to a further aspect, the bearing block can be reversibly removable from a base in such a way that the bearing block can be removed from the tensioning device in order to interrupt the contact between the guide element and the belt. A belt change can thereby easily be carried out without the bearing block and/or the guide device as a physical barrier making the belt change more difficult.
In particular, the base can be designed as a pedestal so that it can interact with a sliding guide such that the bearing block can be pushed into an end position for mounting, or such that the bearing block can be removed from the tensioning device by being pushed out. As a result, the guide device together with the bearing block can be removed from the tensioning device as a collective functional unit in order to make the roller accessible for a belt change. The bearing block can also be designed in two or more parts, wherein initially a first part can be removed from the bearing block in order to then remove the other part of the bearing block or the other parts of the bearing block from the tensioning device without moving the roller mounted in the bearing block in its position relative to the tension rod and the belt.
Alternatively or simultaneously, the bearing block can be reversibly mountable on a base in such a way that the bearing block can be inserted into the tensioning device in order to reestablish the contact between the guide element and the belt after the belt has been threaded onto the tension rod and/or the roller. In this case, the bearing block, together with the guide device as a functional unit, can therefore be remounted after the belt has been threaded onto the tension rod or the roller. A belt change can thereby easily be carried out without the bearing block and/or the guide device as a physical barrier making the belt change more difficult.
Here, too, reference is made to the meaning of “alternatively or simultaneously” given elsewhere. This shall not be repeated for reasons of readability and compactness.
In particular, the base can be designed as a pedestal having a sliding guide, as described above. Here and elsewhere, the sliding guide can serve as a rail that allows the pedestal to slide over. The pedestal can alternatively be designed as a sliding guide which allows the bearing block to slide over the pedestal.
Here, too, the bearing block can be designed in two or more parts, as described elsewhere. This shall not be repeated for reasons of compactness.
According to a further aspect, the bearing block can be removable from the tensioning device in parallel with an axis of rotation of the at least one roller in order to remove the belt from the tension rod and the roller. In particular, the bearing block can be removable from the tensioning device in parallel with an axis of rotation of the at least one roller by it being possible for it to be drawn out of the tensioning device in parallel with the axis of rotation via a sliding guide. This allows for easy removal of the bearing block, together with the guide device, in order to remove the physical barrier in front of the roller and/or tension rod to facilitate belt replacement.
Alternatively or simultaneously, the bearing block can be insertable into the tensioning device in parallel with an axis of rotation of the at least one roller after the belt has been threaded over the tension rod and the roller. In particular, the bearing block can be insertable into the tensioning device in parallel with an axis of rotation of the at least one roller by it being possible for it be inserted into the tensioning device in parallel with the axis of rotation via a sliding guide. This allows for easy remounting after the physical barrier in front of the roller and/or tension rod has been removed, as described above.
Here, reference is made to the meaning of “alternatively or simultaneously” given elsewhere. This shall not be repeated for reasons of readability and compactness.
According to a further aspect, the bearing block can be reversibly fastened at a right angle to a drafting plane by means of a fastening device. The drafting plane is thereby formed by the above-described main drafting zone. This simplifies mounting and removal of the bearing block with the guide element to make changing the belt quicker and easier.
According to a further aspect, the pedestal and the sliding guide can be designed such that they interact in such a way as to form a maximum insertion of the bearing block. The maximum insertion is designed in such a way that the bearing block and the guide device can be positioned reproducibly with repeated insertion. The reproducible insertion takes place in particular relative to the at least one roller and/or the at least one tension rod.
According to an independent aspect, the object can be achieved, in particular, by a drawing device which has at least one tensioning device, as described in detail. The drawing device, as well as the tensioning device, are to be understood as defined and described in detail. This makes it easier to remove or change the belt and correspondingly simplifies and improves maintenance of the drawing device. Time and resources are thereby saved.
According to an independent aspect, the object can be achieved in particular by a spinning unit comprising a tensioning device as described above. Alternatively or additionally, the spinning unit can also comprise a drawing device, as described in detail. This makes it easier to remove or change the belt and correspondingly simplifies and improves maintenance of the drawing device. Time and resources are thereby saved.
In addition to drawing the fiber bundle in the drawing device, a spinning unit also enables a finished yarn to be spun. For this purpose, the spinning unit also has in particular a spinning device in which the yarn is finished.
According to a further aspect, the drawing device and/or the tensioning device can be arranged and designed in such a way that the mounted guide element is accessible for removing the guide element in such a way that the positions of the roller, the belt and the tension rod relative to one another and/or relative to the spinning unit and/or relative to the drawing device are maintained while removing the guide element. This makes it easier to change the belt and improves the reproducibility of rethreading a replacement belt.
Alternatively or simultaneously, the drawing device and/or the tensioning device can be arranged and designed in such a way that the roller and/or the tension rod, when the guide element has been removed, can be accessed for threading the belt over the roller and/or the tension rod. In particular, the positions of the roller and the tension rod relative to each other and/or relative to the spinning unit and/or relative to the drawing device are retained when the belt is threaded and/or when the guide element is mounted. Reproducibility of the threading process is thereby improved.
Here, reference is made to the meaning of “alternatively or simultaneously” given elsewhere. This shall not be repeated for reasons of readability and compactness.
According to an independent aspect, the object is achieved in particular by a spinning machine comprising a spinning unit as described in detail. Alternatively or additionally, the spinning machine can have a tensioning device as described in detail. Also alternatively, the spinning machine can have a drawing device as has been described in detail.
According to a further aspect, the spinning machine and/or the tensioning device can be arranged and designed in such a way that the mounted guide element is accessible for removing the guide element in such a way that the positions of the roller, the belt and the tension rod relative to one another and/or relative to the drawing device and/or relative to the spinning unit and/or relative to the spinning machine are maintained while removing the guide element.
It may be provided that the one roller is one of a front bottom roller, a middle bottom roller and/or a third bottom roller of a spinning unit. The tensioning device described in detail can thus be transferred to the rollers of a spinning unit. Accordingly, all features, functions and the associated advantages that describe and/or characterize any of the independent aspects can be transferred to any other independent aspect. In other words, a drawing device, a spinning unit and/or a spinning machine can be described and characterized by the features, functions and advantages of the tensioning device. This also correspondingly applies to the features, functions and advantages of the spinning machine and/or the spinning unit and/or the drawing device, which can describe and characterize the tensioning device.
In summary, and in other words, an apron guide element, in particular a lower apron guide element, previously described as a guide device, can be combined with a removable roller bearing block, in particular a lower roller bearing block. The apron, in particular lower apron, in a drawing frame is a wearing part. The apron corresponds to the belt described thus far. “Apron” is used as a diminutive in the terminology, but does not indicate a size ratio in the sense of “smaller” or “smaller than”. The apron can be cut to remove it. A new part, a new apron, can be pulled on under the aspects of handling in mass production (fast, simple, uncomplicated) in order to enable the advantages described above. At the same time, the position of all the lower roller components can be very precise in order to improve the quality of the yarn to be produced. Known apron guides remain permanently in their position, and the new apron is placed between the guide surfaces. The embodiment described here can combine maximum positioning precision of the roller, in particular the lower roller, and further in particular the bottom apron travel during operation with handling-friendly replacement of the belt, in particular the bottom apron. Due to the fact that the guide element can be pulled off with the bearing block, the operator is in particular not forced to “thread past” a rigidly installed guide element during the threading.
In order to be able to install a new apron, in particular a bottom apron, after an old apron has worn out, an opening or, in other words, access to the roller, in particular to the lower roller, must be created. A bearing block is in particular designed to be removable for this purpose. In particular, this bearing block has an integrated apron guide element. In particular, this forms a functional combination of the guide element with a removable bearing block. The bearing block can be fastened at a right angle to the drafting plane by means of a screw. This in particular offers the advantage of good accessibility for the operator combined with reproducible positioning of the bearing block.
The apron, in particular lower apron, does rub in particular against the guide lug (another word for the guide device or part thereof by which contact with the apron is or can be produced). This causes wear, wherein the apron wears faster in particular as a result of spinning mode than due to the aforementioned guide wear, which is why the measure can be implemented advantageously. Any designs can be implemented in the form of a drawing frame with individual drives, in conveyor technology, in the field of applications with belt travel (conveyor belts, power transmission belts) and others.
In the following, exemplary embodiments of the invention are described in more detail with reference to figures, showing schematically and by way of example:
The same reference signs are used for elements and structures having the same effect and/or of the same type.
Here, two guide devices 20 are shown by way of example which guide the belt when circulating around the roller 6 and when sliding over the guide edge 28 and the guide surface 29. The belt is contacted and guided at contact points 21. Due to the guidance, here in the form of lateral guidance, the belt runs smoothly around the roller 6 and the guide edge 28, where it is deflected while circulating, back to the roller 6 and the guide surface 29. The occurrence of lateral movements of the belt 1 is also prevented, which would have a negative effect on the tension of the fiber bundle (not shown), which in turn would adversely affect the quality of the spun yarn in the spinning unit 200.
The drawing device 100 shown here is a lower drawing device, which is why the roller 6 is an active lower roller which is driven by means of a motor 7. As shown here, this motor 7 can be arranged below the assembly of a lower tensioning unit. In the case of an upper tensioning unit, this motor can be absent, since the upper rollers are generally not actively driven, as explained in connection with
The roller 6 is rotatably mounted in a fixed bearing block 2. This can also be the bearing block 2 in which the drive 42 transmits the rotational movement of the motor 7 to the rotational axis 3. Opposite this is a functional unit 5, which acts as a bearing block 25(?) with a guide device 20. In a simple embodiment, the guide device 20 can be a metal plate 26 that can counteract the guide pressure at a contact point 21 at which it contacts and thus guides the belt 1 as it rotates around the roller 6 and the tension rod 4. However, a flat body, as shown for example by the guide devices 20, can also be arranged, as shown in
The guide device 20 is arranged here with a screw 15 on the functional unit 5. This is accessible from the outside. This means that the screw 15 is accessible to the user of the drawing device 100 or the spinning unit 200. In this case, this can open a cover (not shown) in the spinning unit 200, for example, as a result of which the screw 15 is presented to the user, which allows said user to loosen the guide device 20. By loosening the screw 15, the guide device 20 can be folded away, in this case downward, whereby the contact with the belt 1 is released, as a result of which there is no longer a contact point 21. The roller 6 is thereby accessible. The belt 1 can be removed, for instance by cutting it. By loosening the screw 15 and subsequently folding away the guide device 20, the roller 6 is made accessible, but the relative positions of the roller 6, the belt 1 and the tension rod 4 remain unchanged.
Furthermore, the functional unit 5 can be designed such that the guide device 20 remains firmly connected to the bearing block 25. The guide device 20 can, for example, also be integrally connected to the part which functions as the bearing block 25. The functional unit 5 therefore fulfills the function of guiding the belt 1 during operation, as well as the function of the bearing block 25. The functional unit 5, as shown here, can be locked in a maximum insertion position via a screw 14. The functional unit 5 rests on a base 19 which functions as a pedestal. In this case, it is pushed onto the pedestal by means of a sliding guide 18. The sliding guide 18 projects over the pedestal 19 at the edges on the left and right with respect to the sliding direction, which determines the sliding direction. This is formed in parallel with the rotational axis 3, whereby, after loosening the screw 14, the functional unit 5 can be pulled out laterally, i.e., perpendicularly to the drafting plane, or perpendicularly to the drawing direction of the yarn. The roller 6 is thereby made accessible. When the functional unit 5 is released, the positions of the belt 1, the tension rod 4 and the roller 6 relative to one another are retained. The guide device 20 is brought out of contact with the belt 1 to make the roller 6 accessible, and the contact point 21 is released. However, the rotational axis 3 remains stationary here when the functional unit 5 has been removed, since it is held by the fixed bearing block 2. The tension rod 4 may also be held on the side of the fixed bearing block 2 only by a mounting bracket 32. As a result, after removal of the functional unit 5, it is possible to pull the belt 1 off the roller 6 and the tension rod 4 without cutting it, if necessary. A new belt can also be threaded onto the roller 6 and the tension rod 4 without having to take into consideration a physical blockage by a fixed bearing block 2 or a guide device 20. After the new belt 1 has been mounted on the tension rod 4 and the roller 6, no further fine adjustment of the tension rod 4 and the roller 6 is necessary. This saves a lot of time which can be used for operating the spinning unit 200. Thereby, the cost of operation is greatly reduced. Instead, the functional unit 5 is simply pushed back in up to a maximum insertion point specified by the pedestal 19 with the sliding guide 18 and reproducibly locked in place by a fastening system, in this case by a screw 14.
The tension rod 4 is shown with the guide edge 28 and guide surface 29 in a mounted state. The guide edge 28 also serves as a deflection edge which deflects the belt 1 back in the direction of the roller 6. The tension rod 4 can be mounted on both sides of the belt 1 by a mounting bracket 32 which does not touch the belt 1 and does not guide it. The tension rod 4 is mounted in the mounting bracket 32 via the screw holder 9 using screws (not shown here). For reasons of clarity, the mounting bracket 32 is only schematically indicated here. Alternatively, however, the tension rod 4 can also protrude into the tensioning device 10 by having a mounting holder 32 only on one side of the belt 1, as described above. The screw holder 9 is designed in particular to accommodate a screw head and allows a screw shank to pass through the tension rod 4 into a thread of a mounting bracket 32, such as a lower roller support or a base body 24, in the mounted state.
The tensioning unit 10 is arranged on a drawing frame carriage 17 which can be inserted into a drawing device 100 by means of locking clamps 22. The tensioning unit 10 can also form a corresponding drawing carriage 17. After the drawing carriage 17 has been inserted into the drawing device 100, the drawing carriage 17 can be fastened in the drawing device by a screw 13. A fiber bundle guide 50 is also shown here by way of example which feeds the fiber bundle to the roller pair (upper roller here not shown here).
“Can” in particular refers to optional features of the invention. Accordingly, developments and/or embodiments of the invention also exist which additionally or alternatively have the corresponding feature or the corresponding features.
From the combinations of features disclosed in the present case, isolated features can also be taken as needed and used by resolving a structural and/or functional relationship possibly existing between the features in combination with other features for delimiting the subject matter of the claim.
| Number | Date | Country | Kind |
|---|---|---|---|
| 503225 | Dec 2022 | LU | national |
