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 a drawing device (100), having: - 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 constructed and arranged to be transferred from a functional state into a non-functional state; wherein the functional state is constructed to position the at least one roller (6) by the belt (1) being constructed and arranged to exert a pulling force on the roller (6), the belt (1) being further constructed and arranged to rotate around one section (30) of the roller and one section (31) of the drawbar (4) in such a way that the pulling force 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 constructed and arranged to move the drawbar (4) by the pulling force on the belt (1) in order to withdraw the belt (1) from the drawbar (4). Thereby the costs required for maintenance and subsequent inspection are optimized.

Description

TECHNICAL FIELD

[0001] The invention relates to a tensioning device having at least one roller, at least one belt, in particular a drive belt, and at least one tension rod, wherein the tensioning device is constructed and arranged to be transferred from a functional state into a non-functional state. The invention further relates to a spinning unit having the tensioning device of the invention. The invention further relates to a spinning machine having the spinning unit of the invention and / or the tensioning device of the invention. BACKGROUND

[0002] A tensioning device is known from EP 2 573 230 B1 in the textile industry, for example, having a plurality of roller pairs, for example 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 the direction of the fiber bundle draw. The tensioning device has a first support section designed to rotatably carry a front lower roller; also a second support section designed to rotatably carry a middle lower roller; also a tension rod designed to adjust the tension and position of a drive belt arranged around the middle lower roller, wherein a third support section is arranged on at least one of the first support section and the second support section and projects and is designed to carry the tension rod, wherein the third support section carries the tension rod by a recess inserted into the tension rod.

[0003] The drive belt wears out and thus has to be replaced after a certain time. In the prior art, the replacement of the drive belt is achieved by pausing the operation of the spinning machine. The spinning machine downtime thus results in costs. SUMMARY

[0004] In view of the above prior art, it is an object of the invention to improve and simplify the belt replacement, to accelerate the replacement process as much as possible, and thus to reduce the costs of replacing the belt.

[0005] The solution according to the invention to achieve the above object is a tensioning device. Another solution according to the invention to achieve the above object is a spinning unit. Another solution according to the invention to achieve the above object is a spinning machine.

[0006] According to one aspect, a solution according to the invention to achieve the above object is a tensioning device.

[0007] The tensioning device is for positioning at least one roller of a spinning unit and / or a drawing device and is correspondingly arranged and constructed. The tensioning device has at least one roller, at least one belt, in particular a drive belt, and at least one tension rod. The tensioning device is constructed and arranged to be transferred from a functional state into a non-functional state.

[0008] The functional state is formed in that the belt, in particular the drive belt, is constructed and arranged to exert a pulling force on the roller, and in that the belt, in particular the drive belt, is further constructed and arranged to rotate around one section of the roller and one section of the tension rod in such a way that the pulling force is transmitted from the tension rod to the roller by the belt, in particular the drive belt.

[0009] The non-functional state is formed in that the tensioning device is constructed and arranged to cause a movement of the tension rod by the pulling force on the belt, in particular the drive belt. The movement is effective in that the belt, in particular the drive belt, can be removed from the tension rod and is correspondingly arranged.

[0010] This enables the belt to be removed and replaced without having to dismount the tensioning device, in particular without having to dismount and / or remove the tension rod.

[0011] The movement of the tension rod by the pulling force on the belt is caused in that the tension rod is constructed and arranged to be movable when the non-functional state is entered. This causes the belt to contract and enter a state of relaxation in the material technology compared to the state in which the belt transmits the pulling force from the tension rod to the roller, on the basis of the inherent elasticity of the belt. Since this relaxed state is entered, the belt is more easily removed from the tension rod, which enables time to be saved when removing it. In other words, the belt is replaced more quickly, both because the belt is in a relaxed state and thus easily movable, and because the belt relaxation itself causes the tension rod to enter an arrangement in which the belt is easily removed.

[0012] The tension rod can be arranged on a base body. The base body itself can be constructed to rotatably support the at least one roller. The support can be of one-piece or two-part design. That is to say, in particular, a lower part can be constructed to hold the rotatable part of the roller guide. In this case, a corresponding upper part can be constructed, which can be mounted on the lower part, so that the roller guide is rotatably supported in two concave, in particular cylindrical, cavities of the upper and lower parts. The roller can be caused to rotate.

[0013] The roller, also referred to as a roil, in particular can be a driven roller, in particular a lower roller. The roller is contacted by the belt in a section under a pulling force, so that the belt can also be moved by the roller, so that the belt can be a drive belt. The drive belt can be caused to rotate around the at least one roller in the section in which it contacts the roller in the functional state. The drive belt can also be caused to rotate around the tension rod in the section in which it contacts the tension rod in the functional state.

[0014] The functional state is in particular the state in which the yarn is spun and the corresponding construction is used. To this end, the fiber bundle is drawn in the drawing device, in particular by passing the fiber bundle through a row of roller pairs. In particular, at least three roller pairs can be arranged, through which the fiber bundle is passed in succession. The belt can be wound around the aforementioned (central) lower roller in a certain section or correspondingly around the (central) upper roller.

[0015] The tension and the position of the belt (position in the direction parallel to the drawing direction, i.e. the drawing position in the drawing direction; position in the direction perpendicular to the drawing direction, i.e. the longitudinal position in the longitudinal direction) are in particular adjusted by means of the drawbar. The installation state of the drawbar thus influences the tension and the position of the belt. In the event of a change in the tension and the position of the belt, the drawing state of the fiber bundle passing between the upper roller and the lower roller in the functional state changes. This can for example cause thickness inhomogeneities in the fiber bundle drawn through the drawing device, thus influencing the quality of the fiber bundle. The belt can also be referred to as a Schürzenband.

[0016] The drawbar can be designed and constructed to adjust the tension and the position of the belt, which, as described above, surrounds the at least one roller, in particular the (central) lower roller, moves around the roller in a certain section and in the process contacts the roller and exerts a pulling force on it. Although reference is made herein to a drawbar, this is not necessarily cylindrical. It also does not necessarily have a circular or oval (partial) cross section. Rather, the drawbar can also refer to a square structure, in particular provided with a belt contact region and a belt contact edge. The drawbar can thus also be referred to as a bridge or a drawbar.

[0017] The belt contact region and / or the belt contact edge can be designed and constructed in such a way that the belt rotates as gently as possible around the drawbar even when a pulling force is exerted on the belt and the belt slides as a drive belt through the drawbar.

[0018] The pulling force can also be understood as the (material) tension introduced into the belt by the movement of the drawbar away from the at least one roller. In other words, the belt can also be said to be tensioned.

[0019] A certain movement gap can exist between the at least one roller, to which a pulling force is exerted by the belt, and a further roller, in particular in the form of a corresponding upper roller. This movement gap can be correspondingly tensioned by the pulling force of the belt, which corresponds to the pulling force transmitted to the belt by means of the drawbar. In other words, the pulling force can be used by means of the drawbar to finely position the at least one roller relative to the at least one further roller in order to adjust the quality of the fiber bundle when drawing.

[0020] The non-functional state is in particular a state in which no fiber bundle passes through the arrangement of the roller pair, also referred to as the roller pair. Furthermore, the non-functional state is in particular a state in which the belt can be removed from the drawbar and / or the roller in order to be replaced, in particular. In other words, the non-functional state can also be understood as a maintenance state and / or a belt replacement state.

[0021] The transition of the functional state into the non-functional state can be reversible. This facilitates the replacement of the belt and the retransition into the functional state after the belt has been replaced.

[0022] The tensioning device can have at least one fastening device which is constructed and arranged to connect the drawbar to the base body. The loosening of the at least one fastening device can cause the transition of the tensioning device from the functional state into the non-functional state. The processing device can be a screw which has a corresponding thread in the base body. In particular, the screw can be loosened by turning it two turns, thereby movably releasing the drawbar. This enables the corresponding relaxation of the drawbar by means of a manual action, which also enables the switching between the functional state and the non-functional state.

[0023] In particular, the transition from the functional state into the non-functional state can be carried out automatically after the belt has been tensioned, without having to intervene specifically by the user. In other words, in particular, the loosening of the fastening device, in particular the screw, is sufficient to switch from the functional state into the non-functional state, in order to transition the belt from the tensioned state into the relaxed state, wherein this relaxation can cause the movement of the drawbar.

[0024] At least one locking device can be provided which is constructed and arranged to lock the drawbar in the functional state in at least one direction. As an alternative, the at least one locking device is also constructed and arranged to movably release the drawbar in the non-functional state in at least one direction in order to enable the movement of the drawbar by means of the tension of the drive belt. This enables the limitation of the aforementioned movability in the functional state, but enables the movability in the non-functional state to be regained, i.e. to be re-established. This movability can not only be regained, but can also be activated by the tension of the belt on the drawbar.

[0025] The locking device can project integrally from the drawbar. As an alternative, the locking device can project integrally from the base body. In other words, the locking device and the drawbar can be formed integrally. In other words, as an alternative, the locking device can be formed integrally with the base body. Further, the at least one locking device locks the drawbar in the functional state in a corresponding receiving region in the base body or in the drawbar. A hybrid type can also be provided, in which a part of the locking device is arranged in the drawbar and a part is arranged in the base body. The same applies to the corresponding receiving region.

[0026] The at least one locking device can be arranged fixedly in a base on the drawbar. In this case, the at least one locking device locks the drawbar in the functional state in a corresponding receiving region in the base body. The base is in particular a press-in base, which enables a press-in of the pin in a manner that cannot be removed. The friction of the pin on the outer wall and the pressure of the press-in base thereon are in particular large, so that removal of the pin can cause damage. This enables locking in a simple manner.

[0027] Alternatively, the at least one locking device can be arranged fixedly in a base on the base body, wherein the at least one locking device locks the drawbar in the functional state in a corresponding receiving region in the drawbar. The base is in particular the press-in base defined previously. This enables locking in a simple manner.

[0028] The at least one corresponding receiving region is constructed and arranged to specify a maximum clearance of the locking device in the corresponding receiving region in at least one direction in order to move the locking device in the receiving region in the at least one direction in order to switch into the non-functional state. This enables the tensioning device to be switched from the functional state into the non-functional state.

[0029] The at least one corresponding receiving region can be constructed and arranged to accommodate the locking device in the functional state to specify a maximum clearance. In particular, the accommodation can be carried out non-contactingly in a certain direction, so that a maximum clearance exists in this direction. The maximum clearance is in particular set in such a way that the locking device in the receiving region is moved in order to switch into the non-functional state. This enables the movement of the drawbar to be limited as a result of the switching into the non-functional state. As mentioned previously, the belt can move the drawbar by means of the pulling force when the drawbar is released, for example, from the base body carrying the drawbar. The clearance of the locking device can limit this movement in order to prevent the structure from collapsing completely. In other words, the drawbar cannot fall from the base body carrying the drawbar, since the clearance set for the at least one locking device is limited.

[0030] Alternatively, the at least one corresponding receiving region can be constructed and arranged to contact the locking device with a region in the functional state. This enables locking. A clearance is provided in order to release the contact with the region by means of the movement of the drawbar when switching into the non-functional state or to contact another region when switching into the non-functional state. This enables the movement of the drawbar to be limited as a result of the switching into the non-functional state. As mentioned previously, the belt can move the drawbar by means of the pulling force when the drawbar is released, for example, from the base body carrying the drawbar. The clearance of the locking device can limit this movement in order to prevent the structure from collapsing completely. In other words, the drawbar cannot fall from the base body carrying the drawbar, since the clearance set for the at least one locking device is limited.

[0031] The at least one locking device can be a longitudinal positioning pin, in particular a longitudinal positioning cylindrical pin. Thereby, in particular the longitudinal position is locked and defined.

[0032] The movement of the drawbar can be a tilting about a first axis. Thereby, in particular the longitudinal position of the drawbar is maintained, but this tilting allows a certain slackening of the belt in order to pull it off the drawbar.

[0033] Alternatively or additionally, the movement of the drawbar can be a rotation about a second axis. Thereby, at least in one point the longitudinal position and the stretching position are maintained (point of rotation and / or point of rotation tilting). This allows a slackening of the belt in order to pull it off the drawbar.

[0034] At least one movement guide device can be provided, which is constructed and arranged to guide the movement of the drawbar when switching into the non-functional state. The at least one movement guide device can in particular be constructed such that it has one of a point of tilting, a point of rotation and / or a point of rotation tilting. This point does not necessarily have to be a mechanically fixed connection, such as a joint, but can also be caused by a contact of the drawbar when the drawbar is moved into the non-functional state.

[0035] Furthermore, the at least one movement guide device can interact with the at least one locking device in such a way that the drawbar enters a certain position when switching into the functional state, in which the drawbar reaches a final position in which the drawbar is fastened together with the base body carrying the drawbar. This allows a simple return of the drawbar into the functional state, thereby improving the positioning and thus simplifying the belt change and further shortening the time required for switching into the functional state.

[0036] Furthermore, the at least one movement guide device can interact with the at least one locking device in such a way that the drawbar enters a certain preset position when switching into the non-functional state. This preset position allows a very simple removal of the belt. In this case, the movement guide device can guide the transition movement of the drawbar from the functional state into the non-functional state, but this transition movement is limited in a first direction. The locking device in particular allows this transition movement, but limits it to enforce the transition towards the preset position.

[0037] The at least one movement guide device can be a positioning pin, which is in particular arranged in a base of the base body. Alternatively, the positioning pin can also be integrated with the base body. The positioning pin can be arranged and constructed to be accommodated in a socket in the drawbar. The socket is designed in such a way that, when switching into the non-functional state, the drawbar moves in a gap of the socket relative to the positioning pin. Thereby, a transition of the movement guided by the movement guide device is achieved. The gap of the socket can allow a certain movement guidance.

[0038] The positioning pin is in particular a positioning cylindrical pin, that is to say it has a cylindrical shape. Alternatively, it can also be square. The base is in particular a pressure base.

[0039] Furthermore, the socket of the at least one movement guide is arranged in the pull rod, while the socket of the at least one locking device is assigned to a base body. In other words, the respective sockets are assigned to the other functional units. In this way, they can interact and coordinate the transfer movement.

[0040] The base body can be a lower roller carrier. In this way, the pull rod can be assigned to a lower roller, in particular a middle lower roller. This correspondence makes it possible for the belt to be placed around a lower roller, in particular in the form of a middle lower roller.

[0041] The base body can be formed in one piece. The base body can also carry a lower roller and integrally have a fastening region for fastening the pull rod.

[0042] The pull rod can be constructed and arranged in such a way that, in the functional state, a section of the pull rod that is surrounded by the drive belt in the functional state protrudes. In this way, the pull rod is arranged in such a way that the belt can be pulled out of the pull rod and the at least one roller in the nonfunctional state. This makes it easy to exchange the belt.

[0043] A belt guide can be provided, which has at least one of a guide pin, an abutment surface and / or an abutment edge. The guide pin can limit the longitudinal position of the belt, which can be moved into this longitudinal position. The abutment surface can be constructed in the pull rod in such a way that the belt only comes into contact with the pull rod in the region of the abutment surface. This reduces the friction of the belt when rotating around the pull rod, which in turn reduces the wear of the belt and increases the service life of the belt. A plurality of abutment surfaces can also be provided, between which regions of the surface of the pull rod are not contacted by the belt. The abutment edge can be constructed in such a way that the belt is deflected when rotating around the pull rod. This reduces the contact surface and protects the belt, which in turn increases the service life.

[0044] The one roller can be one of a front lower roller, a middle lower roller and / or a third lower roller of a spinning unit. In this way, the aforementioned tensioning device can be transferred to a roller of a spinning unit.

[0045] According to one independent aspect, the solution to achieve the above-mentioned object of the present application is in particular a stretching device having at least one of the aforementioned tensioning devices. Thereby, the features, functions and advantages of the tensioning device can be described and characterized accordingly for the stretching device. Thus, the previous explanations apply equally to the stretching device of the present application. The stretching device forms a subunit of a spinning unit, and thus can be described and characterized accordingly for the spinning unit with the features, functions and advantages of the spinning unit. Thus, the following explanations apply equally to the spinning unit of the present application. The spinning unit forms a subunit of a spinning machine, and thus can be described and characterized accordingly for the spinning machine with the features, functions and advantages of the spinning machine. Thus, the following explanations apply equally to the spinning unit of the present application.

[0046] According to one independent aspect, the solution to achieve the above-mentioned object of the present application is in particular a spinning unit comprising a tensioning device of the present application. Thereby, the features, functions and advantages of the tensioning device and / or the stretching device can be described and characterized accordingly for the spinning unit. Thus, the previous explanations apply equally to the spinning unit of the present application. The spinning unit forms a subunit of a spinning machine, and thus can be described and characterized accordingly for the spinning machine with the features, functions and advantages of the spinning machine. Thus, the following explanations apply equally to the spinning unit of the present application.

[0047] The spinning unit can have a row of roller pairs, wherein one upper roller and one lower roller each interact to pass the fiber strand through the roller pair. A plurality of such roller pairs are arranged. By way of example, a rear roller pair, a middle roller pair and a front roller pair are arranged and constructed in such a way as to form a stretching device. The rotational speed of the rollers can increase from the rear roller pair to the front roller pair. The lower roller pair is a driven roller pair, i.e. a roller pair driven by a motor. The upper roller pair is a passive roller, i.e. a so-called driven roller, which follows the movement of the lower roller by virtue of a frictional connection to the lower roller. In particular, the upper roller is non-actively driven as a passive roller.

[0048] The fiber strand is fed into and through the stretching device along the fiber strand guide in the so-called stretching direction. In the process, the fiber strand is stretched for spinning. The spinning unit is also assigned a spinning subunit, which takes over the spinning after the fiber strand has been stretched and is ready for spinning. In other words, it can be said that the spinning unit comprises a stretching device and a spinning subunit, wherein the tensioning device can be assigned to the stretching device.

[0049] The tensioning device of the present application can be assigned to one of the rollers, in particular to the lower roller, in particular to the middle lower roller. The base body can be in particular a one-piece lower roller support.

[0050] According to one independent aspect, the present application provides a solution to the problem addressed above, in particular a spinning machine comprising a spinning unit according to the present application and / or comprising a tensioning device according to the present application. Thereby, the spinning machine can be characterized and described accordingly with the features, functions and advantages of the spinning unit, which in turn can be described and characterized accordingly with the features, functions and advantages of the tensioning device. The previous explanations apply accordingly to the spinning machine according to the present application.

[0051] In summary and in other words, the present application provides in particular a tensioning device for use in a spinning unit, in particular a subunit of a spinning unit, namely a so-called drawing device. The spinning unit is in particular for use in a spinning machine which is intended to spin a yarn on the basis of a fiber bundle. A simple bridge positioning is proposed here, so that the small belt can be easily exchanged. The draw bar can also be referred to as bridge, and the drive belt can also be referred to as small belt.

[0052] In modern textile machines, the bridge is in particular fixed and positioned by means of a conventional cylindrical pin. The bridge is then tightened or loosened with a screw. The cylindrical pin is in particular pressed in an integral lower roller carrier in the form of a base body. A pin hole is located in the bridge. The bridge is currently positioned by means of a conventional cylindrical pin. This type of bridge positioning, however, makes the exchange of the small belt more difficult. The disadvantage is that the bridge cannot be moved when the screw is loosened. The bridge is rigidly held in its position by the cylindrical pin which protrudes from the lower roller carrier. The small belt cannot thus be pulled out of the bridge. For the exchange of the small belt, the bridge has to be dismantled.

[0053] According to the solution to the problem addressed above, the following configuration can be employed. The cylindrical pin can be pressed in the bridge as a locking device and used for longitudinal positioning. A corresponding longitudinal groove, namely a corresponding socket, is located in the lower roller carrier. The cylindrical pin which is in particular pressed in the lower roller carrier is used for positioning, the cylindrical pin being located in the bridge in an elongated hole as a corresponding socket. The present application significantly optimizes the dismantling of the small belt in terms of time. By loosening the screw by means of in particular two turns, the bridge can be tilted in the load direction towards the small belt by means of the positioning cylindrical pin, so that the tension of the small belt is reduced. The small belt can thus be easily pulled out of the bridge. In the case of wear of the small belt, its pulling out is necessary for the exchange of the small belt. BRIEF DESCRIPTION OF DRAWINGS

[0054] Embodiments of the present application will be described in detail below with reference to the attached drawings, in which:

[0055] Figure 1 General overview of a drawing device with a tensioning device;

[0056] Figure 2 Drawing device in the prior art, along Figure 1cross-sectional view along the line A-A in

[0057] Figure 3 tensioning device according to the prior art;

[0058] Figure 4 is a general view of a part of a drawing-off device 100 with a tensioning device 10 according to the present application. This general structure is applicable both to Figure 1 cross-sectional view along the line A-A in

[0059] Figure 5 tensioning device according to the present application.

[0060] Elements and structures of the same action and / or of the same type are denoted by the same reference numerals. DETAILED DESCRIPTION

[0061] Figure 1 is a general view of a part of a drawing-off device 100 with a tensioning device 10 according to the present application. This general structure is applicable both to Figure 4 and Figure 5 the structure of the present application shown in Figure 2 and Figure 3 the prior art.

[0062] The drawing-off device 100 is part of a spinning machine comprising a plurality of roller pairs, of which only two lower rollers, a front lower roller 8 and a middle lower roller 6, are shown in the drawing. They each correspond to a corresponding upper roller, which is not shown here for reasons of clarity. The rear roller pair is likewise not shown for reasons of clarity. A fibre strand (not shown) is guided from the rear roller pair to the front roller pair along a drawing direction A via the middle roller pair. In the process, the lower rollers are driven, here by means of a motor 7 of the front lower roller 8 and the middle lower roller 6. The force of the motor 7 is transmitted to the axis 3 in the case of the front lower roller 8. In this case, the upper rollers are passive rollers, which merely follow the movement of the corresponding lower rollers. The lower rollers are rotatably supported in a lower roller carrier 16 as a base body. Each roller can in particular be assigned an integral lower roller carrier 16. The lower roller carrier 16 is arranged on a base 17.

[0063] A roller carrier section 5 for implementing the aforementioned rotatable support can also be provided. The roller carrier section 5 can consist of an upper section 5A and a lower section 5B, so that the rollers can be easily exchanged.

[0064] In the process, the roller pairs are in particular rotated with increasing speed from the rear roller pair to the front roller pair. The fibre strand is thereby drawn off in order to implement the spinning process in a spinning subunit (not shown). The drawing-off device 100 and the spinning subunit together form a spinning unit 200. The drawing-off device 100 is thus a subunit of the spinning unit 200.

[0065] For the corresponding uniform stretching of the fibre bundle, there is provided here a belt 1 which, in the zone 30, contacts the middle lower roller 6 and thus partially rotates around it. In the process, the belt 1 also rotates around the draw bar 4 (also called bridge) and contacts this draw bar 4 only in the zone 31, precisely in the places where the guide surface 29 and the guide edge 28 deflect it.

[0066] The belt 1 is here a drive belt which, in the active functional state, rotates around the lower roller 6 and the draw bar 4. The middle lower roller 6 can be positioned relative to the front lower roller 8 and relative to the corresponding upper roller (not shown). The tension, i.e. the pulling force, is transmitted to the belt 1 by positioning the draw bar 4. The middle lower roller 6 is precisely positioned (fine positioning) and the running properties of the belt 1 are defined in accordance with this tension. Both are of great significance for the stretching properties of the stretching device 100, which are described further herein. The belt 1 contacts the draw bar 4 and passes next to it, so that the belt 1 ages. In view of this, the belt needs to be replaced from time to time in order to prevent the belt 1 from breaking and thus to prevent machine damage. The procedure for replacing the belt in the prior art Figure 2 and Figure 3 is described and compared with the procedure according to the application shown in Figure 4 and Figure 5 .

[0067] Figure 2 A cross-sectional view along the line A-A in Figure 1 of the prior art tensioning device 10 is shown. Further details are explained here. The general structure is described in connection with Figure 1 . Figure 1 The general structure shown is also applicable to the structure of the application described in connection with Figure 4 and Figure 5 .

[0068] Figure 2 The mounting state of the draw bar 4 with the guide surface 29 is shown, which corresponds to the functional state in the prior art. The draw bar 4 is fixed by means of a screw 11. The screw 11 is arranged in a screw socket 9 in the draw bar. The screw socket 9 serves in particular to accommodate the screw head and to allow the screw shaft to pass through the draw bar into a thread 12 in the lower roller carrier 16 (base body) in the mounted state. The longitudinal position is defined by means of a longitudinal position cylindrical pin 13 arranged in a pressure seat 15 in the lower roller carrier 16. The longitudinal position cylindrical pin 13 is latched into a socket 14 in the draw bar 4 to lock the longitudinal position.

[0069] A belt lateral guide pin 34 can also be provided, which prevents the belt 1 from grinding on the lower roller carrier 16. This belt lateral guide pin 34 is arranged in a press-in seat 35 and is flush with the lying area of the pull rod 4. A seat 19 for a first belt lateral guide (not shown) is also provided in the pull rod 4. This belt lateral guide prevents the belt 1 from slipping off the pull rod 4. The belt lateral guide can be constructed as a belt lateral guide pin 34. The belt 1 is held by the pull rod 4 here. When replacing the belt, the pull rod 4 must be removed as shown, otherwise the belt 1 cannot be pulled out, since the tension on the belt 1 is too great for it to be pulled out of the pull rod 4 and / or the lower central roller 6 by hand. Figure 3

[0070] Figure 3 The tensioning device 10 according to the prior art is shown after removal, in order to show more details. As shown, the longitudinal position cylinder pin 13 is constructed and arranged to snap into the socket 14 and to secure (i.e. lock) the longitudinal position. The belt lateral guide pin 34 is flush with the bridge housing area 36 of the lower roller carrier 16. The longitudinal position cylinder pin 13 is pressed into the press-in seat 15 of the lower roller carrier 16 in the housing area 36 of the pull rod 4, in order to achieve an irreversible connection to the lower roller carrier 16.

[0071] After loosening the screw 11 and removing it from the screw socket 9 and from the thread 12, the pull rod 4 can be removed from the housing area 36. This allows the tension on the belt 1 to be relaxed, in order to remove the belt 1 from the pull rod 4 and the lower roller 6. A new belt 1 can then be fitted and the pull rod 4 must be reinstalled. The belt 1 is then tensioned again.

[0072] The lower roller carrier section 5B is shown in the figure, which has a drilled hole 18 for establishing a connection to the upper roller carrier section 5A.

[0073] Figure 4 A cross-sectional view along the line A-A in the tensioning device 10 according to the application is shown in the figure. In addition to the lateral guide pin 20, a positioning cylinder pin 21 can also be provided, which is pressed in a press-in seat 22 in the lower roller carrier 16. A longitudinal position cylinder pin 13 is also provided, which is in particular arranged in a press-in seat 15 in the pull rod 4. Figure 1

[0074] ​​The positioning cylinder pin 21 is arranged and designed to form a contact with a corresponding socket 23 in the pull rod, which contact is able to coordinate a movement when the screw 11 is loosened. In this process, the screw does not have to be removed. Rather, it is only loosened, for example, by lifting the pull rod 4 to disengage the two longitudinal position cylinder pins 13 from the corresponding sockets 24 arranged in the base body 16. The tilting movement 27 and / or the rotational movement 32 around the tilting axis 37 and / or the rotational axis 32 is thereby released. The tilting movement 27 can be released around the axis 37 during the rotation around the linearly independent axis. In this process, the positioning cylinder pin 21 contacts an area of the corresponding socket in the pull rod 4 in order to coordinate and guide the movement of the pull rod 4. Alternatively, the longitudinal position cylinder pin 13 in the area of the corresponding socket can have a sufficient clearance in order to achieve a certain movement in the socket, which movement allows the corresponding tilting movement 27 and / or the rotational movement 32.

[0075] The belt 1 is still under a certain tension after the screw 11 is loosened. However, this tension in particular causes a transition movement of the pull rod 4 into the non-functional state after the screw 11 is loosened, since the belt material reduces the stored energy and shrinks, if possible. This shrinking is achieved by loosening the screw 11 and the interaction of the positioning cylinder pin 21 with the corresponding socket 23 after the longitudinal position cylinder pin 13 is removed from the corresponding socket 24. As an alternative or additional solution, the socket 24 for the longitudinal position cylinder pin 13 is equipped with a clearance, which allows the tilting movement 27 in the case of loosening the screw 11 as described before.

[0076] The belt 1 is relaxed and removed by the transition movement of the pull rod 4 into the non-functional state (tilting 27 and / or rotation 32), in particular without the pull rod 4 having to be completely removed from the housing region 36. The screw 11 can in particular still be engaged with the thread 12.

[0077] Figure 5 The tensioning device 10 according to the application is shown in the disassembled state. This figure is only for a better understanding of the structure, but, as described before, the disassembly is not necessary in order to bring the tensioning device 10 into the non-functional state. The functional state and the non-functional state are in particular referred to the stretching device 100 and / or the spinning unit 200, wherein here the transition is achieved by the configuration of the tensioning device 10. That is, there is also a Figure 5 The shown disassembled state is not necessary for removing the belt 1 from the pull rod 4.

[0078] The pull rod 4 has pressure seats 15, in which the longitudinal position cylinder pins 13 are fastened. The pressure seats are arranged and designed in such a way that the longitudinal position cylinder pins 13 are accommodated in the corresponding sockets 24 with a gap in the housing region 36 provided in the lower roller body 16.

[0079] The pull rod 4 also has a bore for the screw 11 and a screw socket 9 in order to secure the pull rod 4 on the accommodation region 36.

[0080] The accommodation region 36 of the lower roller carrier 16 also has a positioning cylindrical pin 21 which can be snapped into a corresponding socket 23 of the pull rod 4 in order to lock the orientation in the functional state in coordination with the longitudinal position cylindrical pin 13.

[0081] "may" in particular indicates an optional feature of the application. There are therefore several refinements and / or embodiments of the application which, in addition or alternatively, have the respective features mentioned.

[0082] Isolated features can also be taken from the combinations of features disclosed herein, by removing the structural and / or functional interrelationships which can exist between these features, and in combination with other features, in order to delimit the subject matter of the claims.

[0083] List of reference signs

[0084]

Claims

1. A tensioning device (10) for positioning at least one roller (6) of a spinning unit (200) and / or a stretching device (100), comprising: -The at least one roller (6). -At least one belt (1). -At least one pull rod (4). The tensioning device (10) is constructed and configured to transition from a functional state to a non-functional state; The functional state is configured to position the at least one roller (6) such that the belt (1) is constructed and arranged to apply tension to the roller (6), and the belt (1) is also constructed and arranged to rotate around a section of the roller and a section of the at least one tie rod (4), thereby transmitting the tension from the at least one tie rod (4) to the roller (6) via the belt (1); and The non-functional state is characterized in that the tensioning device (10) is constructed and configured to move the at least one lever (4) by applying a tension force to the belt (1) in order to remove the belt (1) from the at least one lever (4). The tensioning device (10) has at least one fastening device, which is constructed and arranged to connect the at least one tie rod (4) to the base (16). The tensioning device (10) is further provided with at least one locking device (13), which is constructed and arranged to lock the at least one pull rod (4) in the functional state in at least one direction; and The at least one locking device is also constructed and arranged to movably release the at least one lever (4) in at least one direction in the non-functional state so that the movement of the at least one lever (4) is achieved by the tension of the belt (1).

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

3. The tensioning device (10) according to claim 1 or 2, characterized in that, By rotating two revolutions, the at least one fastening device is released, causing the tensioning device (10) to switch from the functional state to the non-functional state.

4. The tensioning device (10) according to claim 1, characterized in that, The at least one locking device (13) is fixedly arranged in the base on the at least one pull rod (4), wherein the at least one locking device (13) locks the at least one pull rod (4) in the functional state in at least one direction within the corresponding receiving area (14) in the base (16); or The at least one locking device (13) is fixedly arranged in the base on the base body (16), and the at least one locking device (13) locks the at least one pull rod (4) in the functional state in at least one direction in the corresponding receiving area (14) of the at least one pull rod (4).

5. The tensioning device (10) according to claim 4, characterized in that, The corresponding receiving area (14) is constructed and arranged to define the maximum gap of the locking device (13) within the corresponding receiving area (14) in at least one direction, so as to move the locking device (13) within the receiving area (14) in the at least one direction, thereby entering the non-functional state.

6. The tensioning device (10) according to claim 4 or 5, characterized in that, The corresponding receiving area (14) is constructed and arranged to contact the locking device (13) in one area in the functional state for locking in at least one direction, wherein a gap is provided so that the contact with the area can be released by the movement of the at least one lever (4) when entering the non-functional state, or contact with another area when entering the non-functional state.

7. The tensioning device (10) according to claim 4 or 5, characterized in that, The at least one locking device (13) is a longitudinal positioning pin.

8. The tensioning device (10) according to claim 1 or 2, characterized in that, The movement of the at least one lever (4) is tilting (27) about the first axis (32) and / or rotating about the second axis (37).

9. The tensioning device (10) according to claim 1 or 2, characterized in that, At least one motion guiding device (21) is provided, which is constructed and arranged to guide the motion of the at least one lever when the non-functional state is entered.

10. The tensioning device (10) according to claim 9, characterized in that, The at least one motion guide device (21) is a positioning pin arranged in the base of the base (16) and configured to be received in a socket (23) in the at least one pull rod (4) such that when the non-functional state is entered, the at least one pull rod (4) moves relative to the positioning pin in the gap of the socket (23).

11. The tensioning device (10) according to claim 1 or 2, characterized in that, The substrate (16) is the lower roller support.

12. The tensioning device (10) according to claim 1 or 2, characterized in that, The at least one pull rod (4) is constructed and arranged such that, in the functional state, the at least one pull rod (4) protrudes from a section surrounded by the belt (1) in the functional state.

13. The tensioning device (10) according to claim 1 or 2, characterized in that, The roller (6) is one of the front lower roller, middle lower roller and / or third lower roller of the spinning unit (200) or stretching device (100).

14. The tensioning device (10) according to claim 1, characterized in that, The belt (1) is a transmission belt.

15. The tensioning device (10) according to claim 1, characterized in that, The fastening device is a screw (11).

16. The tensioning device (10) according to claim 4, characterized in that, The at least one locking device (13) is fixedly arranged in the pressure seat on the at least one pull rod (4); or The at least one locking device (13) is fixedly arranged in the pressure seat on the base (16).

17. The tensioning device (10) according to claim 7, characterized in that, The longitudinal positioning pin is a longitudinal positioning cylindrical pin.

18. The tensioning device (10) according to claim 10, characterized in that, The locating pin is a locating cylindrical pin.

19. The tensioning device (10) according to claim 10, characterized in that, The positioning pin is arranged in the pressure seat of the base (16).

20. A spinning unit (200) comprising a tensioning device (10) according to any one of the preceding claims.

21. A spinning machine comprising a spinning unit (200) according to claim 20 and / or a tensioning device (10) according to any one of claims 1 to 19.

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