Tensioning device and spinning machine

Abstract

The invention relates to a tensioning device (10) for positioning at least one roller (6) of a spinning unit (200) and / or drawing device (100), comprising: - the at least one roller (6), - at least one belt (1), in particular a running belt, - at least one drawbar (4), wherein the tensioning device (10) is designed and configured to be switched from a functional state to a non-functional state; wherein the functional state is designed to position the at least one roller (6) by the belt (1) being designed and arranged to exert a pull on the roller (6), by the belt (1) being further designed and arranged to encircle a partial area (30) of the roller and a partial area (31) of the drawbar (4) such that a pull is transmitted from the drawbar (4) to the roller (6) by the belt (1);and wherein the non-functional state is characterized in that the tensioning device (10) is designed and configured such that, by pulling on the belt (1), the pull rod (4) is moved for the purpose of removing the belt (1) from the pull rod (4). This optimizes the effort required for repair and subsequent inspection.

Description

[0001] The present invention relates to a tensioning device comprising at least one roller, at least one belt, in particular a running belt, and at least one drawbar, wherein the tensioning device is designed and configured to be switched from a functional state to a non-functional state. The invention further relates to a spinning unit with a tensioning device according to the invention. The invention also relates to a spinning machine with a spinning unit and / or a tensioning device according to the invention.

[0002] In the textile industry, a clamping device is known, for example, from EP 2 573 230 B1, in which a clamping 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 sequence along a fiber bundle guide in one direction of fiber bundle extension.The tensioning device has a first support section designed to rotatably support a front lower roller, further has a second support section designed to rotatably support a middle lower roller, further has a pull rod designed to regulate the tension and position of a running belt placed around the middle lower roller, wherein a third support section is arranged on and projects from at least one of the first and second support sections and is designed to support the pull rod, wherein the third support section is designed to support the pull rod by being inserted into a recess formed in the pull rod.

[0003] The drive belt is subject to wear and tear and therefore needs to be replaced after a certain period. According to current technology, replacing the drive belt involves a downtime of the spinning machine. This downtime of the spinning machine thus incurs costs.

[0004] Based on the aforementioned prior art, the object of the invention is to improve and simplify the replacement of the belt, to accelerate the replacement as much as possible and thus to reduce the costs of replacing the belt.

[0005] The problem is solved by a clamping device having the features of claim 1. Furthermore, the problem is solved by a spinning unit having the features of claim 15. Furthermore, the problem is solved by a spinning machine having the features of claim 16.

[0006] Advantageous embodiments of the invention are the subject of the dependent claims.

[0007] According to one aspect, the problem is solved by a clamping device with the features of claim 1.

[0008] The tensioning device is designed and configured for positioning at least one roller of a spinning unit and / or drawing device. It comprises at least one roller, at least one belt (in particular a running belt), and at least one drawbar. The tensioning device is designed and configured to transition from a functional state to a non-functional state.

[0009] The functional state is designed to position the at least one roller by designing and arranging the belt, in particular a running belt, to exert a pull on the roller by further designing and arranging the belt, in particular a running belt, to encircle a partial area of ​​the roller and a partial area of ​​the drawbar in such a way that a pull is transmitted from the drawbar to the roller by the belt, in particular a running belt.

[0010] The non-functional state is configured in such a way that the tensioning device is designed and set up to move the pull rod by pulling on the belt, in particular the running belt. The movement is designed and configured to allow the belt, in particular the running belt, to be removed from the pull rod.

[0011] This allows the belt to be removed and replaced without dismantling the spinning mechanism and, in particular, without having to remove and / or take out the pull rod.

[0012] The movement of the pull rod is caused by the tension on the belt, as the pull rod is designed and positioned in such a way that it becomes movable when transitioning to a non-functional state. The belt is thus contracted according to its inherent elasticity and, in this respect, assumes a state that, from a materials science perspective, is more relaxed than the state in which the belt transmits tension from the pull rod to the roller. This relaxed state also makes it easier to pull the belt off the pull rod, thus saving time during removal. In other words, changing the belt is faster because, firstly, the belt is in a relaxed state and therefore easier to move, and secondly, because the relaxed state of the belt itself causes the pull rod to transition into a configuration that facilitates belt removal.

[0013] The drawbar can be arranged on a base body. The base body itself can be designed to rotatably support at least one roller. The bearing can be one-piece or two-piece. In particular, a lower part can be designed to hold a rotatable section of a roller guide. A corresponding upper part can be designed to be mounted on the lower part such that the roller guide is rotatably supported in the two concave, particularly cylindrical, cavities of the upper and lower parts. This allows the roller to rotate.

[0014] The roller (also called a pulley) can be, in particular, an actively driven roller, especially a lower roller. Since the roller is contacted by the belt under tension in a partial area, the belt can also move over the roller, which is why the belt can be a running belt. In its operating state, the running belt can rotate around the at least one roller in the partial area where it makes contact. The running belt can also rotate around the drawbar in its operating state in the partial area where it makes contact.

[0015] The functional state is, in particular, the state that is intended and designed for spinning yarn. For this purpose, a fiber bundle is stretched in a drawing device, in particular by passing it through a series of roller pairs. In particular, at least three roller pairs can be arranged, which the fiber bundle passes through successively. A belt can be wound around the (middle) lower roller, as described in detail, or around a (middle) upper roller in a partial section.

[0016] The tension and position of the belt (a position parallel to the stretching direction, in other words, a stretched position in the stretching direction; and a position perpendicular to the stretching direction, in other words, a longitudinal position) are primarily regulated by the tie rod. Thus, the tie rod's mounting condition affects the belt's tension and position. Changes in the belt's tension and position also alter the stretched state of the fiber bundle passing between the upper and lower rollers during operation. This can, for example, cause thickness variations in the fiber bundle, which is stretched by a stretching device to affect the bundle's quality. The belt may also be called a belt belt.

[0017] The tie rod can be designed and configured to regulate the tension and position of the belt, which, as described in detail, runs around at least one roller, particularly in the form of a (middle) lower roller, in a partial area around the roller, thereby contacting and tensioning it. Although the term "tie rod" is used here, it does not necessarily have to be cylindrical. Nor does it need to have a round or oval (partial) cross-section. Rather, the tie rod can also be a cuboid structure, which may also be provided with belt contact areas and belt contact edges. Therefore, the tie rod can also be referred to as a bridge or tie rail.

[0018] The belt contact area and / or the belt contact edge can be arranged and designed in such a way that the belt runs around the pull rod as gently as possible, even when a pull is exerted on the belt and it slides over the pull rod as a running belt.

[0019] In other words, tension can also be described as a (material) stress that is introduced into the belt by moving the tension rod relative to at least one roller. In other words, one can also say that the belt is tensioned.

[0020] There can be a range of motion between the at least one roller, which is under tension by the belt, and another roller, particularly in the form of a corresponding upper roller. This range of motion can be tightened by the tension of the belt, corresponding to the tension transmitted to the belt via the drawbar. In other words, the tension, via the drawbar, can allow for fine positioning of the at least one roller relative to at least one other roller, in order to adjust the quality of the fiber bundle during drawing.

[0021] A non-functional state is, in particular, a state in which no fiber bundle can pass through the arrangement of roller pairs (also called roller pairs). Furthermore, a non-functional state is, in particular, a state that allows the belt to be removed from the drawbar and / or the roller, especially for replacement. In In other words, a non-functional state can also be understood as a repair state and / or a belt replacement state.

[0022] It can be designed so that the transition from the functional state to the non-functional state is reversible. This allows for easy belt replacement and also a simple return to the functional state after the belt replacement.

[0023] The clamping device may be provided with at least one fastening device designed and arranged to connect the pull rod to a base body. Releasing this fastening device can change the clamping device from a functional to a non-functional state. The fastening device may be a screw with a corresponding thread (in a base body). The screw can be loosened, in particular, by two turns, thereby releasing the pull rod. This allows the pull rod to be loosened with a simple manual movement, thus enabling a transition between a functional and a non-functional state.

[0024] It can be provided that the transition from the functional state to the non-functional state occurs automatically, following the tension of the belt, without requiring any separate intervention from the user. In other words, this means in particular that, for the change from a functional state to a non-functional state, simply loosening the fastening device, especially the screw, is sufficient to move the belt from a tensioned state to a relaxed state, whereby this relaxation can cause movement of the pull rod.

[0025] At least one locking device can be provided, designed and arranged to lock the pull rod in at least one direction in the functional state. Additionally, this at least one locking device is further designed and arranged to release the pull rod in at least one direction in the non-functional state, allowing it to be moved by the pull of the belt. This allows the described movement to be restricted in a functional state, while the movement can be regained (i.e., restored) in the non-functional state. The movement can not only be regained, but the pull of the belt on the pull rod initiates its movement.

[0026] The locking device can protrude integrally from the pull rod. Alternatively, the locking device can protrude integrally from the base body. In other words, the locking device and the pull rod can be formed from a single piece. Alternatively, the locking device and the base body can be formed from a single piece. Furthermore, it can be provided that the at least one locking device, located in a corresponding receiving area in the base body or in the pull rod, locks the pull rod in its functional state. Hybrid designs are also possible, where part of the locking device is located in the pull rod and part in the base body. The same applies to the corresponding receiving areas.

[0027] It can be provided that at least one locking device is fixedly arranged in a socket on the pull rod. The at least one locking device locks the pull rod in a corresponding receiving area in the base body in the operating state. The socket can, in particular, be an interference fit that allows a pin to be pressed in such a way that it can no longer be removed. The friction of the pin against the outer walls and the pressure exerted on them by the interference fit are particularly high, such that removing the pin could cause damage to it. This allows for a simple locking mechanism to be implemented.

[0028] Alternatively, the at least one locking device can be fixedly arranged in a socket on the base body, with the at least one locking device locking the pull rod in a corresponding receiving area in the pull rod in the functional state. This socket can, in particular, be an interference fit as defined above. This allows for a simple implementation of the locking mechanism.

[0029] It can be provided that the at least one corresponding receiving area is designed and arranged in such a way as to specify a maximum clearance for the locking device in the corresponding receiving area in at least one direction, in order to move the locking device in the receiving area in at least one direction for transitioning to the non-functional state. This allows the clamping device to be transitioned from the functional state to the non-functional state.

[0030] The at least one corresponding receiving area can be designed and arranged to receive the locking device in the functional state, while prescribing maximum play. The receiving area can be contactless, particularly in one direction, such that maximum play is provided in that direction. This maximum play is specifically designed to allow movement of the locking device within the receiving area when transitioning to the non-functional state. This limits the movement of the pull rod when transitioning to the non-functional state. As previously described, the belt can move the pull rod when releasing it, for example, from a supporting body. The play of the locking device can limit this movement, preventing, for instance, the structure from completely disassembling.In other words, this means that the pull rod cannot fall off the base body supporting it because the play set by the at least one locking device is limited.

[0031] Alternatively, the at least one corresponding receiving area can be designed and arranged such that, in the functional state, it contacts the locking device. This enables locking. A clearance is provided to allow the contact with the area to be lost when the pull rod is moved into the non-functional state, or to allow contact with a different area when moving into the non-functional state. This limits the movement of the pull rod when moving into the non-functional state. As previously described, the belt can move the pull rod when it is released, for example, from a supporting body. The clearance of the locking device can limit this movement to prevent, for example, the structure from completely disintegrating.In other words, this means that the pull rod cannot fall off the base body supporting it because the play set by the at least one locking device is limited.

[0032] It may be provided that the at least one locking device is a longitudinal positioning pin, in particular a longitudinal positioning cylindrical pin. This locks and predefines a longitudinal position.

[0033] It may be designed so that moving the pull rod involves tilting it around a first axis. This primarily maintains the longitudinal position of the pull rod, but the tilting also allows the belt to be loosened so that it can be pulled off the pull rod.

[0034] Alternatively or additionally, the movement of the pull rod can be designed to involve rotation around a second axis. This ensures that the stretched and longitudinal positions are maintained at least at one point (rotation point and / or rotation tipping point). This allows the belt to be released so that it can be pulled off the pull rod.

[0035] At least one motion guidance device may be provided, designed and arranged to guide the movement of the drawbar when it is moved into the non-functional state. This at least one motion guidance device may, in particular, be designed to have a tilting point, a rotation point, and / or a rotation-tilting point. This point need not be a mechanically fixed connection, such as a joint, but may also be formed by contact with the drawbar when it is moved into the non-functional state.

[0036] Furthermore, it can be provided that the at least one motion guidance device interacts with the at least one locking device in such a way that the pull rod, during the transition to the functional state, moves into a position in which it assumes its final intended position, in order to secure it in this position to a supporting base body. This allows for a simple return of the pull rod to the functional state, which improves and simplifies positioning, thereby simplifying belt replacement and further reducing the time required for transitioning to the functional state.

[0037] Furthermore, it can be provided that the at least one motion guidance device interacts with the at least one locking device in such a way that the pull rod, during the transition to the non-functional state, moves into a predetermined position. This predetermined position can allow for particularly easy removal of the belt. In particular, it can be provided that the motion guidance device guides the transition movement of the pull rod from the functional state to the non-functional state, but also sets a limit to this movement in a first direction. The locking device, in particular, allows the transition movement but limits it to enforce a transition to the predetermined position.

[0038] It can be provided that the at least one motion guidance device is a position pin, which is arranged, in particular, in a socket of the base body. Alternatively, the position pin can also be formed integrally from the base body. The position pin can be arranged and designed such that it is received in a receptacle in the drawbar. The receptacle can be such that the drawbar moves relative to the position pin within a certain clearance of the receptacle when transitioning to the non-functional state. This enables a transition, with the motion guidance device guiding the movement. The clearance of the receptacle allows for motion guidance.

[0039] The positioning pin can be, in particular, a cylindrical positioning pin, i.e., it has a cylindrical shape. Alternatively, it can also be cuboid. The socket can, in particular, be an interference fit.

[0040] It can further be provided that the mounting for at least one motion guidance device is arranged in the drawbar, while the mounting for at least one locking device is assigned to a base body. In other words, this means that the respective mountings are assigned to different functional units. This allows them to interact and coordinate the transfer movement.

[0041] The base body can be designed as a lower roller carrier. This allows the drawbar to be assigned to a lower roller, particularly a middle lower roller. This assignment allows the belt to be placed around the lower roller, especially in the form of a middle lower roller.

[0042] It is possible for the base body to be formed in one piece. It is also possible for the base body to support the lower roller and to also incorporate a mounting area for attaching the drawbar in one piece.

[0043] It can be designed and positioned so that, in the operational state, the section of the drawbar that is encircled by the drive belt projects outwards. This allows the drawbar to be positioned in such a way that, in the non-operational state, the belt can be pulled off the drawbar and the at least one roller. This facilitates easy belt replacement.

[0044] A belt guide device can be provided, comprising at least one guide pin, a contact surface, and / or a contact edge. The guide pin can define a longitudinal position within which the belt can move. The contact surface can be formed within the pull rod, such that the belt only makes contact with the pull rod in the area of ​​the contact surface. This reduces friction as the belt rotates around the pull rod, thereby reducing wear and extending the belt's service life. Alternatively, multiple contact surfaces can be provided, with the belt not contacting the areas of the pull rod surface between them. The contact edge can be designed to deflect the belt as it rotates around the pull rod. This reduces the contact area and protects the belt, thus extending its service life.

[0045] It is possible for one of the rollers to be a front lower roller, a middle lower roller, and / or a third lower roller of a spinning unit. This allows the tensioning device described in detail to be applied to the rollers of a spinning unit.

[0046] From an independent perspective, the problem can be solved in particular by a stretching device comprising at least one clamping device, as described in detail. The stretching device can thus be described and characterized by the features, functions, and advantages of the clamping device. The above statements therefore also apply accordingly to a stretching device according to the invention. The stretching device forms a subunit of a spinning unit, which is why the stretching device can also be described and characterized by the features, functions, and advantages of the spinning unit. The following statements therefore also apply accordingly to a stretching device according to the invention.

[0047] From an independent perspective, the problem is solved in particular by a spinning unit comprising a clamping device according to the invention. The spinning unit can thus be described and characterized by the features, functions, and advantages of the clamping device and / or stretching device. The above statements therefore also apply accordingly to a spinning unit according to the invention. The spinning unit represents a sub-unit of a spinning machine, which is why the spinning unit can also be described and characterized by the features, functions, and advantages of the spinning machine. The following statements therefore also apply accordingly to a spinning unit according to the invention.

[0048] A spinning unit can have a series of roller pairs, with an upper and a lower roller interacting in such a way that a fiber bundle is guided through the roller pair. Several of these roller pairs are arranged. For example, a rear, middle, and front roller pair can be arranged and configured to form a drawing device. The rotational speed of the rollers can increase from the rear roller pairs towards the front roller pairs. The lower roller pairs are active roller pairs, meaning they are driven by a motor. The upper roller pairs are passive rollers, so-called follower rollers, meaning they follow the movement of the lower rollers by being frictionally connected to them. In particular, the upper rollers, as passive rollers, are not actively driven.

[0049] The fiber bundle is fed to the drawing device along the fiber bundle feeder in a so-called drawing direction and guided through it. During this process, the fiber bundle is stretched in order to spin it. The spinning unit also includes a spinning subunit, which takes over the spinning process after the fiber bundle has been stretched and thus prepared for spinning. In other words, the spinning unit comprises a drawing device and a spinning subunit, with the tensioning device potentially being associated with the drawing device.

[0050] The clamping device according to the invention can be assigned to one of the rollers, in particular a lower roller, and more specifically a middle lower roller. The base body can be the lower roller carrier, which is in particular formed in one piece.

[0051] From an independent perspective, the problem is solved in particular by a spinning machine comprising a spinning unit according to the invention and / or comprising a clamping device according to the invention. Thus, the spinning machine can be characterized and described according to the features, functions, and advantages of the spinning unit, which in turn can be described and characterized accordingly by the features, functions, and advantages of the clamping device. The above statements therefore also apply accordingly to a spinning machine according to the invention.

[0052] In summary, and in other words, the invention provides, in particular, a tensioning device used in a spinning unit, especially in a subunit of the spinning unit, the so-called drawing device. The spinning unit is used, in particular, in a spinning machine designed to spin yarn from a bundle of fibers. A simplified bridge positioning is proposed to facilitate easy belt changes. The drawbar can also be referred to as the bridge, while the running belt can also be called the belt.

[0053] In a modern textile machine, the bridge is positioned using traditional cylindrical pins. A screw is then used to tighten or loosen the bridge. These cylindrical pins are pressed into the one-piece lower roller carrier, which forms the base body. The pin bores are located in the bridge. Modern bridge positioning is achieved using these traditional cylindrical pins. However, this method of bridge positioning makes belt changes more difficult. The disadvantage is that loosening the screw does not allow the bridge to move. It remains rigidly in position due to the cylindrical pins protruding from the lower roller carrier. Therefore, the belt cannot be removed from the bridge. To change the belt, the bridge must be disassembled.

[0054] According to the detailed solution to the problem, the following configuration can be provided. The cylindrical pins can be pressed into the bridge as a locking device and used for longitudinal positioning. The corresponding longitudinal grooves, the corresponding receptacles, are located in the lower roller carrier. The cylindrical pin pressed into the lower roller carrier is specifically designed for positional positioning and engages in a corresponding slot in the bridge. The invention enables significantly faster and more efficient disassembly of the belt. By loosening the screw, particularly with two turns, the bridge can be tilted towards the belt in the direction of the load via the positional cylindrical pin, thereby reducing the belt's tension. This allows the belt to be easily pulled off the bridge. Removing the belt becomes necessary when the belt is worn and needs to be replaced.

[0055] Exemplary embodiments of the invention are described in more detail below with reference to the figures, which show schematically and by way of example: Fig. 1 a general overview of part of a stretching device with a clamping device; Fig. 2 a sectional view along line AA of the Fig. 1 by the stretching device according to the prior art; Fig. 3 a disassembled clamping device according to the prior art; Fig. 4 a sectional view along line AA of the Fig. 1 by the stretching device according to the invention; and Fig. 5 a disassembled clamping device according to the invention.

[0056] The same reference symbols are used for elements and structures that have the same effect and / or are of the same type.

[0057] Fig. 1Figure 1 shows an overview of part of a stretching device 100 with a clamping device 10 according to the invention. The general structure applies accordingly to the structure according to the invention, as described in relation to the Fig. 4 and Fig. 5 as described, as well as for the state of the art as described in Fig. 2 and Fig. 3 is described.

[0058] A drawing device 100 represents part of a spinning machine comprising several pairs of rollers, of which only the two lower rollers of a front lower roller 8 and a middle lower roller 6 are shown here. Each of these is associated with a corresponding upper roller, which are not shown here for clarity. A rear pair of rollers is also omitted for clarity. It can be provided that a fiber bundle (not shown) is guided in a drawing direction A from a rear pair of rollers, via the middle pair of rollers, to the front pair of rollers. The lower rollers are driven, as illustrated here by the motors 7 of the front lower roller 8 and the middle lower roller 6. In the case of the front lower roller 8, the power of the motor 7 is transmitted to an axle 3. The upper rollers are passive rollers that merely follow the movement of the corresponding lower rollers.The lower rollers are mounted to rotate within a lower roller carrier 16 as the base body. In particular, each roller can be assigned a one-piece lower roller carrier 16. The lower roller carrier 16 is arranged on a base 17.

[0059] Furthermore, a roller support section 5 can be provided in which the previously described rotating bearing takes place. The roller support section 5 can be composed of an upper part 5A and a lower part 5B to allow for easy replacement of the roller.

[0060] In the During operation, the roller pairs rotate, particularly with increasing speed, from the rear roller pair to the front roller pair. This stretches the fiber bundle to carry out a spinning process in the spinning subunit (not shown). The stretching device 100 and the spinning subunit together form a spinning unit 200. The stretching device 100 thus constitutes a subunit of the spinning unit 200.

[0061] To stretch the fiber bundle uniformly, a belt 1 is provided which contacts the middle lower roller 6 in a partial area 30 and thus partially encircles it. The belt 1 also encircles a drawbar 4, also referred to as a bridge, and contacts this drawbar 4 only in a partial area 31, more precisely only at the points on a guide surface 29 and on a guide edge 28 where it is deflected.

[0062] The belt 1 is a running belt that, in an active operating state, runs around the lower roller 6 and the drawbar 4. The middle lower roller 6 can be positioned relative to the front lower roller 8 and also relative to the corresponding upper roller (not shown). By positioning the drawbar 4, tension, i.e., a pull, is transferred to the belt 1. Depending on this pull, both the middle lower roller 6 is precisely positioned (fine positioning) and the running characteristics of the belt 1 are determined. Both of these factors are important for the stretching properties of the stretching device 100, as explained elsewhere. Because the belt 1 contacts and slides past the drawbar 4, it is subject to aging. For this reason, the belt must be replaced from time to time to prevent it from breaking, which could damage the machine. The belt replacement is carried out with regard to the Fig. 2and Fig. 3 explained in the prior art and compared with the inventive procedure based on the Fig. 4 and Fig. 5 compared.

[0063] Fig. 2 shows a sectional view along line AA of the Fig. 1 by means of the clamping device 10 according to the state of the art. Additional details are discussed here. For a description of the general structure, refer to the Fig. 1 referred back. The general structure of the Fig. 1 This applies accordingly to the inventive structure as it relates to the Fig. 4 and Fig. 5 is described.

[0064] In Fig. 2The drawbar 4 with guide surface 29 is shown in an assembled state, which corresponds to the functional state according to the prior art. The drawbar 4 is held in place by a screw 11. The screw 11 is arranged in a screw receptacle 9 in the drawbar. This screw receptacle 9 is specifically designed to receive the screw head and allows a screw shank to pass through the drawbar into a thread 12 in the lower roller carrier 16, the base body, in the assembled state. A longitudinal position is defined by longitudinal positioning cylindrical pins 13, which are arranged in press fits 15 in the lower roller carrier 16. The longitudinal positioning cylindrical pins 13 engage in the receptacles 14 in the drawbar 4, thereby locking the longitudinal position.

[0065] A belt side guide pin 34 can also be provided, which prevents the belt 1 from rubbing against the lower roller carrier 16. This belt side guide pin 34 is arranged in an interference fit 35 and terminates flush with the mounting area for the drawbar 4 of the base body. A socket 19 for a first belt side guide (not shown) is also provided in the drawbar 4. This belt side guide prevents the belt 1 from slipping off the drawbar 4. The belt side guides can be designed as belt side guide pins 34. Here, the belt 1 is held by the drawbar 4. For a belt change, the drawbar 4 must be removed, as shown in Fig. 3 This is shown because otherwise the belt 1 cannot be removed, as the tension on the belt 1 is too high to remove it manually from the drawbar 4 and / or from the middle lower roller 6.

[0066] Fig. 3Figure 1 shows a disassembled clamping device 10 according to the prior art to illustrate further details. It becomes clear that the longitudinal positioning cylindrical pins 13 are designed and arranged to engage in the receptacles 14 and thereby fix, i.e., lock, a longitudinal position. The belt side guide pin 34 terminates planar with the bridge receiving area 36 of the lower roller carrier 16. The longitudinal positioning cylindrical pins 13 are pressed into press fits 15 of the lower roller carrier 16 in the receiving area 36 of the drawbar 4 to ensure an irreversible connection with the lower roller carrier 16.

[0067] After loosening screw 11 and removing the pull rod 4 from screw receptacle 9, and simultaneously removing it from the thread 12 of the mounting area 36, ​​the pull rod 4 can be removed. This allows the tension on the belt 1 to be released, enabling the belt 1 to be removed from the pull rod 4 and the lower roller 6. A new belt 1 is then fitted, and the pull rod 4 must be reinstalled. This retensions the belt 1.

[0068] The lower roller support section 5B is shown, which has bores 18 to allow a connection with the upper part of the roller support section 5A.

[0069] Fig. 4 shows a sectional view along line AA of the Fig. 1by a clamping device 10 according to the invention. In addition to the lateral guide pin 20, a position-position cylindrical pin 21 can also be provided, which is pressed into the lower roller carrier 16 in an interference fit 22. Longitudinal position cylindrical pins 13 are also provided, which are located in interference fits 15 in the drawbar 4.

[0070] The position-position cylindrical pin 21 is arranged and designed to form contact with a corresponding receptacle 23 in the drawbar, which can coordinate movement when the screw 11 is loosened. The screw 11 does not need to be removed. Rather, it is sufficient to loosen it such that the two longitudinal position cylindrical pins 13 emerge from the corresponding receptacles 24 located in the base body 16, for example, by lifting the drawbar 4. This releases a tilting movement 27 and / or a rotational movement 32 about the tilting axis 37 and / or the rotational axis 32. This tilting movement 27 can be released about an axis 37, while the rotation can occur about a linearly independent axis. The position-position cylindrical pin 21 contacts a region of a corresponding receptacle in the drawbar 4 to coordinate and guide the movement of the drawbar 4.Alternatively, the longitudinal position cylindrical pins 13 in the corresponding receiving areas can have sufficient play to allow movement in the receiving areas, which permits a corresponding tilting movement 27 and / or rotational movement 32.

[0071] The belt 1 remains under tension after the screw 11 is loosened. This tension, however, necessitates a transitional movement of the pull rod 4 into a non-functional state after the screw 11 has been loosened, as the belt material dissipates the stored energy and contracts as soon as it can. This contraction is made possible by loosening the screw 11 and the interaction of the position-position cylindrical pin 21 with the corresponding receptacle 23, after the longitudinal-position cylindrical pins 13 have been removed from their corresponding receptacles 24. Alternatively or additionally, the receptacles 24 for the longitudinal-position cylindrical pins 13 can be provided with play, allowing a tilting movement 27 as soon as the screw 11 has been loosened, as described above.

[0072] The transition movement (tilting 27 and / or rotating 32) of the pull rod 4 into the non-functional state releases the belt 1, allowing it to be removed, particularly without completely disassembling the pull rod 4 from the mounting area 36. Specifically, the screw 11 may still be engaged with the thread 12.

[0073] Fig. 5 Figure 1 shows a disassembled clamping device 10 according to the invention. The illustration here serves only to provide a better overview of the structure, but as previously described, disassembly is not necessary to put the clamping device 10 into a non-functional state. In this context, functional and non-functional states refer specifically to the stretching device 100 and / or the spinning unit 200, with the transition being mediated by the configuration of the clamping device 10. According to the invention, a disassembly state is also included, which is shown here in Fig. 5shown, but this is not necessary for carrying out the removal of the belt 1 from the pull rod 4.

[0074] The drawbar 4 has press fits 15 in which the longitudinal positioning cylindrical pins 13 are fastened. These are arranged and designed such that the longitudinal positioning cylindrical pins 13 can be received in corresponding receptacles 24 with clearance, which are provided in the receiving area 36 of the lower roller body 16.

[0075] The pull rod 4 further has a bore for the screw 11 and a screw receptacle 9 to fix the pull rod 4 to the receptacle 36.

[0076] The receiving area 36 of the lower roller carrier 16 further includes the position positioning cylindrical pin 21, which can engage in a corresponding receptacle 23 of the drawbar 4 in order to lock the position in a functional state in coordination with the longitudinal position cylindrical pins 13.

[0077] The term "may" refers in particular to optional features of the invention. Accordingly, there are also further developments and / or embodiments of the invention that additionally or alternatively include the respective feature(s).

[0078] From the combinations of features disclosed herein, isolated features can also be selected as needed and, by dissolving any structural and / or functional relationship that may exist between the features, used in combination with other features to define the subject matter of the claim. Reference symbol list

[0079] 1 Belts, running belts 22 Long pin socket in the base body, press fit 2 Carrier section 3 axis 23 Long pin receptacle in the drawbar 4 Drawbar / bridge 24 Pin socket in the base body 5 Carrier section 25 Pin socket in pull rod 6 middle lower roller 26 Sheet metal 7 Motor 27 Direction of rotation around position cylinder pin / tilting movement 8 front lower roller 9 Screw receptacle 28 Guide edge 10 Clamping device 29 Guide surface 11 screw 30 Section of the belt that runs around the section of the roller 12 threaded socket 13 Longitudinal position cylinder pin / locking device 31 The section of the belt that runs around the pull rod 14 Pin holder in pull rod 32 Axis of rotation / Rotational movement 15 Pin socket in base body, press fit 33 Tilting direction around position cylinder pin 16 Base body, lower roller carrier 17 base 34 Belt side guide pin 18 Drilling 35 Mounting for belt side guide pin, press fit 19 Version 20 Side guide pin 36 Bridge area 21 Long pin / Positioning cylindrical pin / Motion guidance device 37 Tilting axle 100 Stretching device 200 Spinning unit

Claims

1. Tensioning device (10) for positioning at least one roller (6) of a spinning unit (200) and / or drawing device (100), comprising: - the at least one roller (6), - at least one belt (1), in particular a drive belt, - at least one drawbar (4), wherein the tensioning device (10) is designed and configured to be switched from a functional state to a non-functional state; wherein the functional state is configured to position the at least one roller (6) by the belt (1) being designed and arranged to exert a pull on the roller (6) by the belt (1) being further designed and arranged to encircle a partial area (30) of the roller and a partial area (31) of the drawbar (4), such that a pull is transmitted from the drawbar (4) to the roller (6) by the belt (1); and wherein the non-functional state is characterized by , that the clamping device (10) is designed and set up in such a way as to throughto move the pull on the belt (1) the pull rod (4), for removing the belt (1) from the pull rod (4).

2. Clamping device (10) according to claim 1, characterized by the fact that The transition from the functional state to the non-functional state is reversible.

3. Clamping device (10) according to one of claims 1 or 2, characterized by the fact that the clamping device (10) has at least one fastening device, in particular a screw (11), which is designed and arranged to connect the drawbar (4) to a base body (16), wherein loosening the at least one fastening device, in particular loosening the screw (11), in particular by two screw turns, changes the clamping device (10) from the functional state to the non-functional state.

4. Clamping device (10) according to one of the preceding claims, characterized by the fact thatat least one locking device (13) is provided, which is designed and arranged to lock the pull rod (4) in at least one direction in the functional state; and which is further designed and arranged to release the pull rod (4) movably in at least one direction in the non-functional state, for movement of the pull rod (4) by the pull of the belt (1).

5. Clamping device (10) according to claim 4, characterized by the fact thatthe at least one locking device (13) is fixedly arranged on the drawbar (4) in a socket (15), in particular a press fit, wherein the at least one locking device (13) locks the drawbar (4) in at least one direction in a corresponding receiving area (14) in the base body (16) in the operating state; or wherein the at least one locking device (13) is fixedly arranged on the base body (16) in a socket (15), in particular a press fit, wherein the at least one locking device (13) locks the drawbar (4) in at least one direction in a corresponding receiving area (14) in the drawbar (4) in the operating state.

6. Clamping device (10) according to claim 5, characterized by the fact thatthe at least one corresponding receiving area (14) is designed and arranged in such a way as to provide a maximum clearance for the locking device (13) in at least one direction in the corresponding receiving area (14) in order to move the locking device (13) in the receiving area (14) in at least one direction for a transition to the non-functional state.

7. Clamping device (10) according to one of claims 5 or 6, characterized by the fact that the at least one corresponding receiving area (14) is designed and arranged in such a way as to contact the locking device (13) with an area in the functional state for locking in at least one direction, wherein a clearance is provided, in such a way as to lose contact with the area when transitioning to the non-functional state by moving the pull rod (4) or in such a way as to contact another area when transitioning to the non-functional state.

8. Clamping device (10) according to one of claims 5 to 7, characterized by the fact that the at least one locking device (13) being a longitudinal positioning pin, in particular a longitudinal positioning cylindrical pin.

9. Clamping device (10) according to one of the preceding claims, characterized by the fact that the movement of the drawbar (4) is a tilting (27) about a first axis (32) and / or a rotation about a second axis (37).

10. Clamping device (10) according to one of the preceding claims, characterized by the fact that at least one movement guidance device (21) is provided which is designed and arranged to guide the movement of the drawbar when transitioning to the non-functional state.

11. Clamping device (10) according to one of the preceding claims, in particular according to claim 10, characterized by the fact thatthe at least one motion guidance device (21) is a position positioning pin, in particular a position positioning cylindrical pin, which is arranged in a socket (22), in particular a press fit, of the base body (16) and which is arranged and designed in such a way as to be received in a receptacle (23) in the drawbar (4) in such a way as to move the drawbar (4) relative to the position positioning pin (21) in a clearance of the receptacle (23) when transitioning to the non-functional state.

12. Clamping device (10) according to one of the preceding claims, characterized by the fact that the base body (16) is a lower roller carrier.

13. Clamping device (10) according to one of the preceding claims, characterized by the fact that the tie rod (4) is designed and arranged to project in the functional state with the part of the tie rod (4) that is encircled by the belt (1) in the functional state.

14. Clamping device (10) according to one of the preceding claims, characterized by the fact thatone roller (6) is one of a front lower roller, a middle lower roller and / or a third lower roller of a spinning unit (200) or a stretching device (100).

15. Spinning unit (200) comprising a clamping device (10) according to one of the preceding claims.

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