Yarn clamping device

Abstract

The present invention relates to a yarn clamping device for a spindle for releasably securing a yarn in a clamping gap, comprising a first clamping unit comprising an inner sleeve that can be arranged coaxially with the spindle and a yarn separator that can be axially fixed to the inner sleeve, wherein the first clamping unit can be fixed to the upper part of the spindle in an axially fixed manner, and a second clamping unit comprising a clamping element that can be axially adjusted relative to the first clamping unit between a clamping position that closes the clamping gap between the yarn separator and the clamping element and an open position that releases the clamping gap. According to the invention, the yarn separator is designed to be fixed to the upper part of the spindle in an axially fixed manner and to be connected to the upper part of the spindle in a rotationally fixed manner, and the yarn separator is connected to the inner sleeve in a rotationally fixed manner.

Description

Technical Field

[0001] The present invention relates to a yarn clamping device for a spinning machine or a twisting machine, which is used to fix the yarn in a clamping gap in a releasable manner and has

[0002] - a first clamping unit comprising an inner sleeve which can be arranged coaxially with the spindle and a yarn separator which can be fixed axially to the inner sleeve, wherein the first clamping unit can be fixed to the upper part of the spindle in an axially positioned manner, and

[0003] a second clamping unit comprising a clamping element which is axially adjustable relative to the first clamping unit between a clamping position in which a clamping gap between the yarn separator and the clamping element is closed and an open position in which the clamping gap is released. Background Art

[0004] Various technical solutions for yarn clamping devices of the type mentioned at the outset are disclosed in the prior art, such as DE 10 2011 076 744 A1, which can be used to secure so-called winding yarns when changing full bobbins on spinning or twisting machines.

[0005] To this end, the yarn clamping device usually has a first and a second clamping unit mounted on the rotatable upper part of the spinning or twisting spindle. The first clamping unit, for example, comprises an inner sleeve mounted in a torsionally fixed manner on the rotatable upper part of the spinning or twisting spindle, and a yarn separator resting on one end of the inner sleeve, wherein the inner sleeve is fixed at its other end to the upper part of the spinning or twisting spindle to achieve axial position locking. The second clamping element (for example, an outer sleeve arranged coaxially with the inner sleeve) is supported so as to be axially movable relative to the rotatable upper part of the spinning or twisting spindle and relative to the first clamping unit and is held by a spring in a clamping position that closes the clamping gap between the yarn separator and the second clamping unit until the spinning or twisting spindle reaches a specific speed.

[0006] The second clamping element is designed to, in the clamping position, secure the yarn in the clamping gap in the absence of centrifugal forces caused by the rotation of the upper part of the spinning spindle or twisting spindle. Under the influence of centrifugal forces, the second clamping element is axially displaced toward an open position, in which the yarn secured in the clamping gap is released.

[0007] In the case of known yarn clamping devices, the connection area of ​​the upper part of the spinning or twisting spindle is locally knurled in order to achieve a torsion-proof connection with the inner sleeve of the first clamping unit. During installation, the knurled section cuts into the inner sleeve, thereby producing a form-locking connection that acts in the circumferential direction between the inner sleeve and the upper part of the spinning or twisting spindle. However, the technical solution of locally knurling the upper part of the spinning or twisting spindle places high demands on the production of the spinning or twisting spindle. For example, if the edges of the knurled section are not sharp enough, then during the installation of the inner sleeve on the upper part of the spinning or twisting spindle, these edges will not cut into the plastic of the inner sleeve in the desired manner. This results in a material displacement process instead, in which the inner sleeve is pressed radially outwards, so that the outer diameter of the inner sleeve is locally increased. In this way, undesirable friction may occur between the inner sleeve and the clamping element which is axially displaceable relative to the inner sleeve, which may lead to jamming and thus to malfunction of the yarn clamping device.

[0008] As an alternative, DE 10 2011 076 744 A1 proposes providing the inner side of the inner sleeve with a toothed annular surface for engaging with a corresponding contour of the spindle upper part. This solution also places high demands on the manufacturing of the inner sleeve and the spindle upper part. If the toothing is not precise, material displacement will also occur on the inner sleeve, pressing the inner sleeve radially outward. Summary of the Invention

[0009] On this basis, the object of the present invention is to provide a yarn clamping device which enables a rotationally fixed connection of an inner sleeve to a spindle of a spinning machine or twisting machine in a simple and reliable manner.

[0010] The yarn clamping device of the present invention has a first and a second clamping unit. The first clamping unit includes an inner sleeve that can be arranged coaxially with the spindle and a yarn separator that can be axially fixed to the inner sleeve, wherein the first clamping unit can be fixed to the upper part of the spindle in an axially positioned manner. The second clamping unit is equipped with a clamping element, which can be axially adjusted relative to the first clamping unit between a clamping position that closes the clamping gap between the yarn separator and the clamping element and an open position that releases the clamping gap. The second clamping unit can have a common technical solution disclosed in the prior art. Accordingly, the clamping element of the second clamping unit can be constructed, for example, as a one-piece or multi-component outer sleeve, which is supported by the inner sleeve in a manner that can move relative to the inner sleeve. To this end, the inner sleeve and the outer sleeve or the clamping element can have corresponding, interactively connected supporting components and moving components on their inner or outer sides. An example of a supporting member is a protrusion and a recess that can engage with each other, which are correspondingly constructed on the inner sleeve and the clamping element, thereby causing a guided relative movement of the clamping element relative to the inner sleeve. The moving member can preferably be formed by a conventional centrifugal force unit having several centrifugal force elements. These centrifugal force elements are supported between the inner sleeve and the clamping element in a certain manner, so that the clamping element can move relative to the inner sleeve according to the spindle rotation speed to open and close the clamping gap accordingly.

[0011] The yarn clamping device of the present invention is characterized in that the yarn separator is constructed to be fixed on the spindle upper part in an axially positioned manner and is torsionally connected to the spindle upper part, and the yarn separator is torsionally connected to the inner sleeve. In order to arrange the yarn clamping device on the spindle upper part of a spinning machine or a twisting machine, the inner sleeve of the first clamping unit is sleeved onto the upper part of the spindle. The axial position of the inner sleeve along the sleeve direction can preferably be defined by the corresponding technical solution of the spindle, for example, by a convex portion or a shoulder on which one end of the inner sleeve can abut on the end side. According to the present invention, the yarn separator is used to achieve axial position locking of the inner sleeve in a direction opposite to the sleeve direction on the spindle, and the yarn separator is axially fixed to the spindle in a manner that is operatively connected to the inner sleeve at the other end.

[0012] According to the present invention, in addition to locking the inner sleeve in the axial position, the yarn separator also serves to connect the inner sleeve to the spindle in a torque-proof manner. For this purpose, the yarn separator is at least capable of being torque-proof connected to the inner sleeve and, more preferably, to the spindle upper part. Accordingly, in addition to axially positioning the inner sleeve on the spindle upper part at least in a direction opposite to the direction in which the inner sleeve is fitted, the yarn separator also serves to torque-proof connect the inner sleeve to the spindle. In its position axially positioning the inner sleeve on the spindle upper part, the yarn separator engages the first clamping unit and also creates a torque-proof connection to the spindle upper part. Because the yarn separator can be torque-proof connected to the inner sleeve in this position, achieving a torque-proof connection of the inner sleeve to the spindle upper part, the spindle does not need to employ a separate technical solution for achieving a torque-proof connection in the region of connection with the inner sleeve.

[0013] The yarn clamping device thus makes it possible to attach the inner sleeve to the spindle upper part in a particularly simple and reliable manner in a torque-proof manner, effectively preventing deformation of the inner sleeve, for example due to interaction with connecting elements on the spindle upper part, which could lead to operational malfunctions. The yarn clamping device of the present invention makes it possible to connect the yarn clamping device to the spindle particularly simply and cost-effectively.

[0014] The torsion-proof connection between the yarn separator and the spindle upper part can in principle be constructed in any desired manner, for example using a form-fit connection, wherein torsion resistance is achieved between the spindle upper part and the yarn separator by a specific shape. According to a preferred technical solution of the present invention, the yarn separator can be pressed onto the spindle upper part.

[0015] According to this technical solution of the present invention, the yarn separator is designed as follows: when the yarn clamping device is installed on the spindle, the yarn separator is connected to the spindle upper part in a torque-proof manner via a compression connection. The compression connection is designed to not only securely position the inner sleeve axially along the spindle, at least in a direction opposite to the direction in which the inner sleeve is fitted, but also to prevent the inner sleeve from twisting relative to the spindle. This compression connection between the spindle and the yarn separator is particularly easy and cost-effective to establish.

[0016] To achieve a torsionally fixed connection between the yarn separator and the inner sleeve, according to a preferred embodiment of the present invention, the yarn separator can be connected to the inner sleeve in a torsionally fixed manner by force-locking, material-bonding, and / or form-locking. For example, a force-locking connection can be achieved by suitable surface design of the mutually contacting surfaces of the yarn separator and the inner sleeve, wherein the pressing force and the friction generated between the surfaces ensure reliable torsion resistance. A material-bonding connection can be achieved, for example, by adhesive bonding.

[0017] In order to establish a positive-locking connection, according to a preferred improvement of the present invention, the yarn separator has a locking element that can be engaged with a contact section on the inner sleeve, in particular, can be pressed into the contact section. According to this technical solution of the present invention, the yarn separator is constructed in a certain way in the contact area with the inner sleeve so that before the yarn clamping device is installed on the spindle or during the installation process, the locking element on the yarn separator is pressed into the inner sleeve at a defined position, thereby establishing a positive-locking connection between the inner sleeve and the yarn separator. Through this preferred technical solution of the present invention, the inner sleeve can be arranged on the spindle in a substantially gap-free and torsion-resistant manner in a particularly reliable and simple manner. In addition, based on the preferred technical solution of the yarn separator, the first clamping unit can be fixed to the spindle upper part in an axially positioned manner both in the sleeve direction and in the opposite direction. In this preferred embodiment, no elements for fixing the inner sleeve in the sleeve direction can be provided on the spindle upper part or on the spindle itself.

[0018] Particularly preferably, the latching elements can be pressed into a contact section of the inner sleeve, which is formed of a material that is deformable by force, to clamp the inner sleeve to the spindle upper part. For example, selected or all latching elements on the yarn separator can be sized so that, during the installation of the yarn clamping device on the spindle, these latching elements can be pressed into the contact section of the inner sleeve, which is formed of a material containing, for example, plastic, in a manner that causes material displacement toward the center of the inner sleeve. This results in a reduction in the inner diameter of the inner sleeve at the corresponding material displacement point, thereby generating a clamping force that clamps the inner sleeve to the spindle upper part. Preferably, the yarn separator can generally be constructed of a metal-containing material. Therefore, in this preferred embodiment, the latching elements can be pressed into the contact section of the inner sleeve more reliably and easily. Particularly preferably, the yarn separator constructed of a metal-containing material is manufactured using a sintering process rather than conventional turning methods. This allows the latching elements, particularly polygonal ones, to be formed extremely precisely on the yarn separator. In this way, the first clamping unit can be fixed to the spindle upper part in a simple and reliable manner both in the circumferential direction and in the axial direction, without having to provide any additional fixing elements on the inner sleeve and / or the spindle upper part. The inner diameter of the inner sleeve is preferably selected based on the outer diameter of the spindle upper part, so that based on the inner diameter of the inner sleeve, the inner sleeve can be placed on the spindle upper part and the clamping effect can be generated by pressing the locking elements in.

[0019] According to another preferred technical solution of the present invention, the contact section on the inner sleeve includes a coupling element that can be operatively connected to the latching element. According to this technical solution of the present invention, coupling elements that match the shape of the latching elements on the yarn separator are provided in the contact section of the inner sleeve. When the yarn clamping device is mounted on the spindle, these coupling elements and the corresponding latching elements work together in a form-locking manner along the circumference, thereby ensuring a reliable and torsion-proof connection. The latching element and the coupling element are particularly preferably configured as a tooth system, thereby achieving particularly reliable torsion-proof and axial positioning of the inner sleeve by the yarn separator in both the axial and circumferential directions.

[0020] According to another preferred technical solution of the present invention, a connecting element is provided in the area between the contact section and the yarn separator, which is configured to be connected to the contact section and the yarn separator in a non-positive and / or positive manner in a torsion-proof manner. According to this preferred technical solution of the present invention, the connecting element serves as an adapter element, which can be connected to both the yarn separator and the contact section of the inner sleeve in an axial direction in a torsion-proof manner. Therefore, by using the connecting element, the yarn separator and the inner sleeve can be connected torsionally in the connection area in a manner independent of their technical solution. In this case, the connecting element serves as an adapter, which connects the yarn separator and the inner sleeve at least circumferentially in a non-positive and / or positive manner, so that the yarn separator and the contact section do not need to be matched to each other.

[0021] Further preferably, the connecting element can be constructed to fix the first clamping unit axially on the spindle upper part in a torsionally fixed manner by means of clamping or press fit. Therein, the connecting element can preferably be arranged on the spindle upper part by means of an interference fit and / or has a snap-fit ​​element as described above, for producing a clamping effect on the spindle upper part by means of material displacement on the yarn separator side and / or the contact section side during the installation of the yarn clamping device. As an alternative, the functional connection between the yarn separator and the connecting element and / or between the contact section of the inner sleeve and the connecting element can be achieved as follows: by arranging corresponding snap-fit ​​elements on the yarn separator and / or the contact section, material displacement as described above is caused on the connecting element side to clamp the first clamping unit on the spindle upper part. The component with material displacement or the corresponding component section is formed by a material that can be deformed by the action of force, for example, by a plastic-containing material. As mentioned above, the inner diameter is constructed according to the outer diameter of the upper part of the spindle, so that a clamping effect or a press fit or an interference fit can be generated by material displacement.

[0022] According to a preferred technical solution of the present invention, the connecting element is constructed as a retaining ring or a toothed ring, which can particularly reliably realize a non-positive and / or positive-locking rotationally fixed connection, wherein the retaining ring provides sufficient friction torque and the toothed ring ensures a reliable positive-locking connection.

[0023] Furthermore, and in contrast to previously known solutions, the yarn separator can be produced from a metal-containing material by means of a sintering method, so that in particular a polygonal shape can be formed more precisely. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is an explanation of the embodiments of the present invention with reference to the accompanying drawings.

[0025] Figure 1 is a schematic exploded view of a yarn clamping device according to one embodiment;

[0026] Figure 2 A schematic perspective view of another embodiment of an inner sleeve of a yarn clamping device;

[0027] Figure 3 for Figure 1 A schematic perspective view of a yarn separator of a yarn clamping device;

[0028] Figure 4 is a schematic perspective view of another embodiment of a yarn separator, and

[0029] Figure 5 FIG. 4 is a schematic perspective view of another embodiment of a yarn separator. DETAILED DESCRIPTION

[0030] like Figure 1 The yarn clamping device 1 shown is used to clamp a yarn on the upper part of a spindle (not shown here), in particular on a spinning machine or twisting machine not shown here, comprising: an inner sleeve 3a of a first clamping unit 2 that can be arranged to rotate anti-rotatably relative to the spindle upper part, and in addition to the inner sleeve 3a, the first clamping unit also has a yarn separator 4a that can be pressed onto the spindle upper part, and the yarn separator fixes the yarn clamping device 1 to the spindle upper part in the axial direction in a manner opposite to its sleeve direction.

[0031] In order to achieve a rotationally fixed connection between the inner sleeve 3a and the spindle upper part, the yarn separator 4a which is pressed rotationally fixedly onto the spindle upper part is provided with a coaxially circumferentially arranged latching element 9 in the form of a toothing 15 in the contact area with the inner sleeve 3a (see Figure 3 ).

[0032] When the yarn clamping device 1 is mounted on the spindle upper part, the toothed portion 15 is pressed into the contact section 8a on the inner sleeve 3a at the end side and causes the material of the contact section 8a to be displaced toward the center of the inner sleeve, thereby clamping the inner sleeve axially on the spindle upper part in a torsionally fixed manner and ensuring that the inner sleeve 3a is arranged on the spindle upper part in a torsionally fixed manner. As an alternative or supplementary solution, according to another embodiment, the yarn separator 4a can be arranged on the spindle upper part in a torsionally fixed and axially fixed manner by an interference fit.

[0033] A clamping element 6 is provided coaxially with the inner sleeve 3a and is axially displaceable relative to the inner sleeve 3a. This clamping element 6 forms an outer sleeve that can be placed onto the inner sleeve 3a and is displaceable relative to the inner sleeve 3a and the yarn separator 4a in a known manner along a longitudinal axis 11. The facing surfaces of the yarn separator 4a and the clamping element 6 form a clamping gap 7 of the yarn clamping device 1, in which the yarn can be clamped and thus clamped on the spindle. According to this embodiment, the axially displaceable clamping element 6 is supported on the inner sleeve 3a in an axially prestressed manner by means of a helical compression spring 12, so that when the spindle is in the rest position, it is arranged in a clamping position in which the clamping element 6 is in contact with the yarn separator 4. In order to automatically move the clamping element 6 towards an open position in which the yarn is released, the yarn clamping device 1 includes, in a known manner, a centrifugal force unit not shown here, whose centrifugal force mechanism includes several centrifugal force elements, which, as soon as the spindle rotates at a specific minimum speed, separate the axially movable clamping element 6 from the yarn separator 4a, thereby opening the clamping gap 7 and releasing the yarn located in the clamping gap 7.

[0034] Figure 2 Another embodiment of the inner sleeve 3b is shown in a somewhat simplified manner in order to achieve the same Figure 3 The torsion-proof connection of the yarn separator 4a shown in the figure has a coaxially encircling tooth system 14 composed of several coupling elements 10 in the contact section 8b. The technical solution of the tooth system 14 on the inner sleeve 3b is similar to that of the embodiment shown in the figure. Figure 3 The technical design of the toothing 14 of the yarn separator 4a shown is adapted so that, in the installed position of the yarn clamping device 1 on the spindle upper part, a secure, rotationally fixed connection between the yarn separator 4a and the inner sleeve 3b is achieved.

[0035] Figure 4 A further embodiment of a yarn separator 4b is shown, in which the coupling element 9 is formed by spherical segments 16, which are pressed into the contact section 8a of the inner sleeve 3a during the installation of the first clamping unit 2 and a rotationally fixed connection is ensured by the yarn separator 4b being arranged rotationally fixed on the spindle upper part.

[0036] Figure 5Another embodiment of a yarn separator 4c is shown, in which the locking element 9 for achieving a torsion-proof connection with the inner sleeve 3a is composed of several circumferentially arranged webs 17, which form a polygonal contact surface, which establishes a circumferentially positive connection with the contact section 8a of the inner sleeve 3a.

[0037] Reference Signs

[0038]

Claims

1. A yarn clamping device (1) for a spinning machine or a twisting machine, for releasably fixing a yarn in a clamping gap (7), having - a first clamping unit (2), comprising an inner sleeve (3a, 3b) which can be arranged coaxially with the spindle and a yarn separator (4a, 4b, 4c) which can be fixed axially on the inner sleeve (3a, 3b), wherein: The first clamping unit (2) can be fixed on the upper part of the spindle in an axially positioned manner, and - a second clamping unit (5) comprising a clamping element (6) which is axially adjustable relative to the first clamping unit (2) between a clamping position in which a clamping gap (7) between the yarn separator (4a, 4b, 4c) and the clamping element (6) is closed and an open position in which the clamping gap (7) is released, It is characterized by: The yarn separator (4a, 4b, 4c) is constructed to fix the inner sleeve (3a, 3b) on the spindle upper part in an axially positioned manner and to connect the inner sleeve (3a, 3b) to the spindle upper part in a rotationally fixed manner, and The yarn separator (4a, 4b, 4c) and the inner sleeve (3a, 3b) are connected in a torsion-resistant manner. Wherein, the yarn separator (4a, 4b, 4c) has: an engaging element (9) capable of engaging with a contact section (8a, 8b) on the inner sleeve (3a, 3b), or A connecting element is provided in an area between a contact section (8a, 8b) on the inner sleeve (3a, 3b) and the yarn separator (4a, 4b, 4c), the connecting element being connected to the contact section (8a, 8b) and the yarn separator (4a, 4b, 4c) in a non-positive and / or positive manner.

2. The yarn clamping device (1) according to claim 1, characterized in that The yarn separators (4a, 4b, 4c) are formed from a metal-containing material by means of a sintering method.

3. The yarn clamping device (1) according to claim 1 or 2, characterized in that: During the assembly of the yarn clamping device, the connecting element can produce a clamping effect with the spindle upper part by means of material displacement on the yarn separator side and / or on the contact section side.

4. The yarn clamping device (1) according to claim 1 or 2, characterized in that: The functional connection between the yarn separator and the connecting element and / or between the contact section of the inner sleeve and the connecting element can be achieved as follows: by arranging corresponding locking elements on the yarn separator and / or the contact section, material displacement is caused on the connecting element side to clamp the first clamping unit on the spindle upper part, wherein the component with material displacement or the corresponding component section is formed by a material that can be deformed due to the action of force.

5. The yarn clamping device (1) according to claim 1 or 2, characterized in that: The latching element (9) can be pressed into a contact section (8a) formed of a deformable material in order to clamp the inner sleeve (3a) on the spindle upper part.

6. The yarn clamping device (1) according to claim 1 or 2, characterized in that: The contact section (8a, 8b) has a coupling element (10) that can be operatively connected to the latching element (9).

7. The yarn clamping device (1) according to claim 1 or 2, characterized in that: The latching element (9) is designed as a tooth system (14).

8. The yarn clamping device (1) according to claim 6, characterized in that The coupling element (10) is designed as a toothing (14).

9. The yarn clamping device (1) according to claim 1 or 2, characterized in that: The connecting element is designed as a retaining ring or a toothed ring.

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