DEVICE FOR POSITIONING A ROLLER OR FOR TENSIONING A BELT, DRAWING DEVICE, SPINNING UNIT AND SPINNING MACHINE COMPRISING SUCH A DEVICE

Abstract

The invention relates to a device for positioning at least one roller in a drawing device and/or in a spinning unit, and/or for tensioning at least one belt, in particular a running belt, in a drawing device and/or in a spinning unit, wherein the device comprises: the at least one roller which is rotatably mounted, the at least one belt, in particular a running belt, at least one tension rod, and at least one guide device for contacting the belt at at least one contact point for guiding the belt during operation of the at least one roller.

In order to improve and simplify the process of changing the belt, the at least one guide device is arranged and designed in such a way as to make the lower roller reversibly accessible for removing the belt and/or threading the belt, in particular without changing the relative positions of the roller, tension rod and/or belt to one another.

Claims

1. A device (10) for positioning at least one roller (6) in a drawing device (100) and/or in a spinning unit (200), and/or for tensioning at least one belt (1), in particular a running belt, in a drawing device (100) and/or in a spinning unit (200), wherein the device (10) comprises: the at least one roller (6) which is rotatably mounted, the at least one belt (1), in particular a running belt, at least one tension rod (4), and at least one guide device (20) for contacting the belt (1) at at least one contact point (21) in order to guide the belt (1) during operation of the at least one roller (6), wherein the tension rod (4) and the roller (6) are designed and arranged in such a way that the belt (1) is arranged for operation in such a way that it runs around at least part of the roller (6) in a contact region (30), and wherein the tension rod (4) and the roller (6) are designed and arranged in such a way that the belt (1) is arranged for operation in such a way that it runs around at least part of the tension rod (4), wherein the tension rod (4) and the roller (6) are designed and arranged relative to one another in such a way that the belt (1) runs around the tension rod (4) and the roller (6) in a tensioned manner during operation of the at least one roller (6), wherein the belt (1) can be guided by the at least one guide device (20) during circulation, and wherein the at least one guide device (20) is arranged and designed in such a way that the roller (6), in particular designed as a lower roller, is reversibly accessible for removing the belt (1) and/or threading the belt (1), in particular without changing the relative positions of the roller (6), tension rod (4) and/or belt (1) to one another.

2. The device (10) according to claim 1, characterized in that the guide device (20) is arranged and designed in such a way as to interrupt the contact between the guide device (20) and the at least one belt (1), the at least one roller (6), the at least one belt (1) and the at least one tension rod (4) being designed and arranged in such a way as to retain their positions relative to one another when the contact between the guide device (20) and the belt (1) is interrupted.

3. The device (10) according to claim 1, characterized in that the guide device (20) is arranged so as to be reversibly removable relative to at least one of the at least one roller (6), the at least one belt (1) and/or the at least one tension rod (4) in order to remove the guide device (20) so that the belt can be removed from the tension rod (4) and/or the roller (6), the relative position between the guide device (20), the belt (1) and the roller (6) being maintained when the guide device (20) is removed; or the guide device (20) being reversibly mountable relative to at least one of the roller (6), the belt (1) and/or the tension rod (4) in order to mount the guide device (20) after the belt has been threaded onto the tension rod (4) and/or the roller (6), the relative position between the guide device (20), the belt (1) and the roller (6) being maintained when the guide device (20) is mounted.

4. The device (10) according to claim 1, characterized in that the roller is rotatably mounted in a bearing block (25), the bearing block (25) and the guide device (20) forming a functional unit (5) which is designed and arranged in such a way that, when the functional unit (5) is mounted, the belt (1) is contacted at a contact point (21) by the guide device (20).

5. The device (10) according to claim 1, characterized in that the bearing block (25) is designed to be at least partially removable in order to remove part of the bearing block (25) from the functional unit (5) in order to interrupt the contact between the guide device (20) and the belt (1); or the removable part of the functional unit (5) of the bearing block (25) being mountable in such a way as to mount the removable part of the bearing block (25) in the functional unit (5) in order to establish the contact between the guide device (20) and the belt (1) after the belt (1) has been threaded onto the tension rod (4) and/or the roller (6).

6. The device (10) according to claim 1, characterized in that the bearing block (25) can be reversibly removed from a base (19), in particular on a pedestal with a sliding guide (18), in such a way that the bearing block (25) can be removed from the device (10) in order to interrupt the contact between the guide element (20) and the belt (1); or the bearing block (25) being reversibly mountable on a base (19), in particular on a pedestal with a sliding guide (18), in such a way that the bearing block (25) can be inserted into the device (10) in order to reestablish the contact between the guide element (20) and the belt (1) after the belt has been threaded onto the tension rod (4) and/or the roller (6).

7. The device (10) according to claim 1, characterized in that the bearing block (25) can be removed from the device (10) in parallel with an axis of rotation (3) of the at least one roller (6), in particular by it being possible for it to be pulled out of the device (10) in parallel with the axis of rotation (3) via a sliding guide (18) in order to remove the belt (1) from the tension rod (4) and the roller (6); or the bearing block (25) being introducible into the device (10) in parallel with an axis of rotation (3) of the at least one roller (6), in particular by it being possible for it to be inserted into the device (10) in parallel with the axis of rotation (3) via a sliding guide (18) after the belt (1) has been threaded over the tension rod (4) and the roller (6).

8. The device (10) according to claim 1, characterized in that the bearing block (25) can be reversibly fastened at a right angle to a drafting plane by means of a fastening device, in particular by means of a screw.

9. The device (10) according to claim 1, characterized in that the pedestal (19) and the sliding guide (18) are designed such that they interact to form a maximum insertion of the bearing block (25) such that the bearing block (25) and the guide device (20) can be positioned in a reproducible manner with repeated insertion, in particular relative to the at least one roller (6) and/or the at least one tension rod (4).

10. A drawing device (100) comprising a device (10) according to claim 1.

11. A spinning unit (200) comprising a device (10) according to claim 1.

12. The spinning unit (200) according to claim 11, characterized in that the drawing device (100) and/or the device (10) are arranged and designed such that the mounted guide element (20) is accessible for removing the guide element (20) in such a way that the positions of the roller (6), the belt (1) and the tension rod (4) relative to one another, relative to the drawing device (100) and/or relative to the spinning unit (200) are maintained while removing the guide element (20); or the drawing device (100) and/or the device (10) being arranged and designed such that, when the guide element (20) is removed, the roller (6) and/or the tension rod (4) are accessible for threading the belt (1) over the roller (6) and/or the tension rod (4), in particular the positions of the roller (6) and the tension rod (4) relative to one another and/or relative to the spinning unit (200) being maintained while threading the belt (1) and/or while mounting the guide element (20).

13. A spinning machine comprising a spinning unit (200) according to claim 11.

14. The spinning machine according to claim 13, characterized in that the spinning machine, the spinning unit (200), the drawing device (100) and/or the device (10) are arranged and designed in such a way that the mounted guide element (20) is accessible for removing the guide element (20) in such a way that the positions of the roller (6), the belt (1) and the tension rod (4) relative to one another and/or relative to the drawing device (100), relative to the spinning unit (200) and/or relative to the spinning machine are maintained while removing the guide element (20); or the spinning machine and/or drawing device (100) and/or the device (10) being arranged and designed such that, when the guide element (20) is removed, the roller (6) and/or the tension rod (4) are accessible for threading the belt (1) over the roller and/or the tension rod (4), in particular the positions of the roller (6) and the tension rod (4) relative to one another and/or relative to the spinning unit (200) and/or relative to the drawing device (100) being maintained while threading the belt (1) and/or while mounting the guide element (20).

Description

[0067] FIG. 1 shows an overview of part of a drawing device having a tensioning device according to the prior art; and

[0068] FIG. 2 shows an overview of part of a drawing device according to the invention having a tensioning device according to the invention.

[0069] The same reference signs are used for elements and structures having the same effect and/or of the same type.

[0070] FIG. 1 shows an overview of part of a drawing device 100 according to the prior art. This is a tensioning device 10, more precisely an upper tensioning device having a roller 6, here in the form of an upper roller, which is rotatably mounted by its shaft 3 in fixed bearing blocks 2 arranged at a spacing from one another. The shaft 3 has an extension which also functions as an axis of rotation. The shaft is shown here with a cut surface 3a. The upper roller 6 does not have a motor drive. Rather, this is a purely passive roller which runs around the belt (not shown here for reasons of clarity). The belt also runs around a guide edge 28 and a guide surface 29. These are in particular arranged in such a way that the belt can be held tight, i.e., in order to tension it. The bearing blocks 2 are attached to a base body 24 in order to arrange the tensioning device 10 in the drawing device 100.

[0071] Here, two guide devices 20 are shown by way of example which guide the belt when circulating around the roller 6 and when sliding over the guide edge 28 and the guide surface 29. The belt is contacted and guided at contact points 21. Due to the guidance, here in the form of lateral guidance, the belt runs smoothly around the roller 6 and the guide edge 28, where it is deflected while circulating, back to the roller 6 and the guide surface 29. The occurrence of lateral movements of the belt 1 is also prevented, which would have a negative effect on the tension of the fiber bundle (not shown), which in turn would adversely affect the quality of the spun yarn in the spinning unit 200.

[0072] FIG. 2 shows part of a drawing device 100 according to the invention comprising a roller 6, a tension rod 4 and a belt 1 which function as a tensioning device 10. The belt 1 runs around the roller 6 as an endless belt in a contact region 30. Furthermore, the belt 1 runs around the tension rod 4, which it touches at a guide edge 28 at which it is deflected, and at a guide surface 29 on which it rests in a contact region 31. As a result, the belt 1 is tensioned between the roller 6 and the tension rod 4. The quality of the drawing of the fiber bundle (not shown) is thereby improved, whereby the quality of the spun yarn (not shown) is also improved.

[0073] The drawing device 100 shown here is a lower drawing device, which is why the roller 6 is an active lower roller which is driven by means of a motor 7. As shown here, this motor 7 can be arranged below the assembly of a lower tensioning unit. In the case of an upper tensioning unit, this motor can be absent, since the upper rollers are generally not actively driven, as explained in connection with FIG. 1. A rotational movement of the motor shaft 41 is thereby transmitted via a drive 42 to the rotational axis 3 of the roller 6. A corresponding drive 42 can be, for example, a V-belt which interacts with the rotational axis 3 of the roller 6 in such a way that the rotational movement of the motor 7 is transmitted, which causes the roller 6 to actively rotate around the rotational axis 3. As a result, the belt 1 is also set in motion and therefore rotates around the tension rod 4 and the roller 6. This corresponds to an operating state as a functional state.

[0074] The roller 6 is rotatably mounted in a fixed bearing block 2. This can also be the bearing block 2 in which the drive 42 transmits the rotational movement of the motor 7 to the rotational axis 3. Opposite this is a functional unit 5, which acts as a bearing block 25(?) with a guide device 20. In a simple embodiment, the guide device 20 can be a metal plate 26 that can counteract the guide pressure at a contact point 21 at which it contacts and thus guides the belt 1 as it rotates around the roller 6 and the tension rod 4. However, a flat body, as shown for example by the guide devices 20, can also be arranged, as shown in FIG. 1.

[0075] The guide device 20 is arranged here with a screw 15 on the functional unit 5. This is accessible from the outside. This means that the screw 15 is accessible to the user of the drawing device 100 or the spinning unit 200. In this case, this can open a cover (not shown) in the spinning unit 200, for example, as a result of which the screw 15 is presented to the user, which allows said user to loosen the guide device 20. By loosening the screw 15, the guide device 20 can be folded away, in this case downward, whereby the contact with the belt 1 is released, as a result of which there is no longer a contact point 21. The roller 6 is thereby accessible. The belt 1 can be removed, for instance by cutting it. By loosening the screw 15 and subsequently folding away the guide device 20, the roller 6 is made accessible, but the relative positions of the roller 6, the belt 1 and the tension rod 4 remain unchanged.

[0076] Furthermore, the functional unit 5 can be designed such that the guide device 20 remains firmly connected to the bearing block 25. The guide device 20 can, for example, also be integrally connected to the part which functions as the bearing block 25. The functional unit 5 therefore fulfills the function of guiding the belt 1 during operation, as well as the function of the bearing block 25. The functional unit 5, as shown here, can be locked in a maximum insertion position via a screw 14. The functional unit 5 rests on a base 19 which functions as a pedestal. In this case, it is pushed onto the pedestal by means of a sliding guide 18. The sliding guide 18 projects over the pedestal 19 at the edges on the left and right with respect to the sliding direction, which determines the sliding direction. This is formed in parallel with the rotational axis 3, whereby, after loosening the screw 14, the functional unit 5 can be pulled out laterally, i.e., perpendicularly to the drafting plane, or perpendicularly to the drawing direction of the yarn. The roller 6 is thereby made accessible. When the functional unit 5 is released, the positions of the belt 1, the tension rod 4 and the roller 6 relative to one another are retained. The guide device 20 is brought out of contact with the belt 1 to make the roller 6 accessible, and the contact point 21 is released. However, the rotational axis 3 remains stationary here when the functional unit 5 has been removed, since it is held by the fixed bearing block 2. The tension rod 4 may also be held on the side of the fixed bearing block 2 only by a mounting bracket 32. As a result, after removal of the functional unit 5, it is possible to pull the belt 1 off the roller 6 and the tension rod 4 without cutting it, if necessary. A new belt can also be threaded onto the roller 6 and the tension rod 4 without having to take into consideration a physical blockage by a fixed bearing block 2 or a guide device 20. After the new belt 1 has been mounted on the tension rod 4 and the roller 6, no further fine adjustment of the tension rod 4 and the roller 6 is necessary. This saves a lot of time which can be used for operating the spinning unit 200. Thereby, the cost of operation is greatly reduced. Instead, the functional unit 5 is simply pushed back in up to a maximum insertion point specified by the pedestal 19 with the sliding guide 18 and reproducibly locked in place by a fastening system, in this case by a screw 14.

[0077] The tension rod 4 is shown with the guide edge 28 and guide surface 29 in a mounted state. The guide edge 28 also serves as a deflection edge which deflects the belt 1 back in the direction of the roller 6. The tension rod 4 can be mounted on both sides of the belt 1 by a mounting bracket 32 which does not touch the belt 1 and does not guide it. The tension rod 4 is mounted in the mounting bracket 32 via the screw holder 9 using screws (not shown here). For reasons of clarity, the mounting bracket 32 is only schematically indicated here. Alternatively, however, the tension rod 4 can also protrude into the tensioning device 10 by having a mounting holder 32 only on one side of the belt 1, as described above. The screw holder 9 is designed in particular to accommodate a screw head and allows a screw shank to pass through the tension rod 4 into a thread of a mounting bracket 32, such as a lower roller support or a base body 24, in the mounted state.

[0078] The tensioning unit 10 is arranged on a drawing frame carriage 17 which can be inserted into a drawing device 100 by means of locking clamps 22. The tensioning unit 10 can also form a corresponding drawing carriage 17. After the drawing carriage 17 has been inserted into the drawing device 100, the drawing carriage 17 can be fastened in the drawing device by a screw 13. A fiber bundle guide 50 is also shown here by way of example which feeds the fiber bundle to the roller pair (upper roller here not shown here).

[0079] Can in particular refers to optional features of the invention. Accordingly, developments and/or embodiments of the invention also exist which additionally or alternatively have the corresponding feature or the corresponding features.

[0080] From the combinations of features disclosed in the present case, isolated features can also be taken as needed and used by resolving a structural and/or functional relationship possibly existing between the features in combination with other features for delimiting the subject matter of the claim.

TABLE-US-00001 List of reference signs 1 Belt, running belt 2 Fixed bearing block 3 Shaft/rotational axis 3a Cross section 4 Tension rod/bridge 5 Functional unit 6 Roller 7 Motor 8 Front lower roller 9 Screw holder 10 Device/tensioning device 13, 14, 15 Screw 17 Drawing frame carriage 18 Sliding guide 19 Base/pedestal 20 Guide device/guide element 21 Contact point 22 Mounting bracket for drawing frame carriage 24 Base body, roller support 25 Bearing block 26 Metal plate 27 Direction of rotation about positioning cylinder pin 28 Guide edge 29 Guide surface 30 Contact region as a portion of the belt running around a portion of the roller 31 Contact region as a portion of the belt running around a portion of the tension rod 32 Mounting bracket for the tension rod/bridge receiving region 40 Motor cover 41 Motor shaft 42 Drive 50 Fiber guide 100 Drawing device 200 Spinning unit