Thread clearer and cutter for thread clearer

Abstract

To provide a thread clearer with a cutter having excellent service life and a cutter with a cutter knife and an anvil.SOLUTION: The present invention provides a thread clearer for a work unit of a fiber machine with a cutter for complete removal of defects from a thread, and a cutter for a thread clearer which can be installed in a work unit of a fiber machine, and relates to a thread clearer and a cutter provided with a cutter knife including a cutting edge which can move between a rest position and a cutting position and an anvil which is placed in an operation position on an anvil support. At the operation position, a contact surface provided in the anvil is in cooperation at a cutting position with the cutting edge of the cutter knife. The anvil has at least two contact surfaces which can be placed with respect to the anvil support at an operation position and is adjustably placed in the anvil support to select a contact surface which can bring an interaction relation with the cutting edge.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cutting device for a yarn clearer that can be arranged in a working unit of a fiber machine, - a cutting knife having a cutting edge movable between a rest position and a cutting position, - an anvil arranged in an operating position on an anvil support, wherein in the operating position, a contact surface provided on the anvil cooperates with the cutting edge of the cutting knife at the cutting position, and the anvil Comprising a cutting device.

[0002] During the production of yarn, usually, the highest possible uniformity of the yarn within a narrow tolerance range and a yarn without particularly visible defects such as unacceptable thick or thin spots are required. In order to meet such requirements, so-called yarn clearers are used in individual working units of the fiber machine, and the yarn clearers continuously monitor, for example, the diameter of the yarn with a suitable measuring head. When an unacceptable defect is detected based on exceeding or falling below a limit value called a clearing limit, the defect is cut off from the yarn by a cutting device of the yarn clearer, the yarn ends are joined to each other again, and the manufacturing process is continued.

[0003] Known cutting devices for yarn clearers are operated, for example, electromagnetically, and known cutting devices are formed in the form of a shear or as a chisel in the form described above, and the latter structural form is advantageous based on the relatively simple structure.

[0004] However, such a structural form has the disadvantage that the service life of the cutting knife cooperating with the anvil is shorter than that of a cutting device acting in a shear shape. This is because, based on the operating mode of this cutting device, in order to cut the yarn, the cutting edge of the cutting knife collides with the contact surface of the anvil with a preset impact force, resulting in increased wear. As a result, it is necessary to regularly replace the cutting knife or the anvil in order to maintain a uniform cutting output.

[0005] Taking this as a starting point, the fundamental problem of the present invention is to provide a thread clearer equipped with a cutting device that is superior in terms of long service life, and a cutting device equipped with a cutting knife and an anvil.

[0006] The present invention solves this problem with a cutting device having the features of claim 1 and a thread clearer having the features of claim 11. Advantageous improved forms of the cutting device are described in the dependent claims.

[0007] The cutting apparatus according to the present invention is Anvil, - Having at least two contact surfaces that can be positioned relative to the anvil support in the operating position, - To select the contact surface that can be brought into interaction with the cutting edge, it is positioned on the anvil support in an adjustable manner. It is characterized by the following.

[0008] According to the present invention, the anvil has at least two separate contact surfaces formed on it, so that the anvil can be positioned on the anvil support in two positions in the operating position, and in the operating position, at least one of the two contact surfaces cooperates with the cutting edge of the cutting knife in the cutting position. Therefore, for example, if the first contact surface becomes excessively worn, the anvil can be adjusted relative to the anvil support without replacing the anvil, and then in the operating position, the second contact surface can face the cutting edge of the cutting knife as the corresponding support, and the thread can be cut between the second contact surface and the cutting edge if necessary.

[0009] To select a contact surface that can be brought into interaction with the cutting edge, the present invention identifies that the anvil is adjustablely positioned on an anvil support. This adjustability makes it convenient to select, when necessary, the contact surface of the anvil facing the cutting edge from at least two contact surfaces of the anvil. The configuration of the coupling between the anvil and the anvil support is essentially freely selectable, as long as the anvil can be positioned in the operating position with at least one of the at least two contact surfaces.

[0010] A particularly advantageous configuration of the present invention is that the anvil is detachably arranged on the anvil support. Detachable means that the anvil can be removed from the anvil support without destruction, and especially repeatedly. This configuration of the present invention makes it particularly easy and comfortable to align the anvil so that the desired contact surface cooperates with the cutting edge of the cutting knife in the operating position. Thus, if necessary, for example, due to wear of the first contact surface, the anvil can be removed from the anvil support based on the detachable coupling, and then re-coupled to the anvil support by the operator so that at least the second contact surface cooperates with the cutting edge of the cutting knife in the operating position.

[0011] The reliable function and long service life of the cutting device can be achieved, in particular, by aligning the cutting edge of the cutting knife parallel to the contact surface of the anvil at the cutting position, thereby ensuring a uniform load on the contact surface and the cutting edge, and a clean cut of the thread to be cut by the cutting device. In an improved embodiment of the present invention, the anvil is specified to be pivotally coupled to the anvil support such that, in the operating position, the cutting edge aligns the contact surface to the cutting edge at the cutting position, particularly parallel to each other.

[0012] According to this configuration of the present invention, the anvil coupled to the anvil support in the operating position is characterized by its ability to change its alignment with respect to the cutting knife based on the pivotally positioned configuration of the anvil relative to the anvil support. This provides the possibility that, after the initial assembly of the anvil to the anvil support in the operating position, the initial movement of the cutting edge from the resting position to the cutting position will adjust the contact surface with respect to the anvil support by the cutting edge, thereby aligning the contact surface particularly parallel to the cutting edge. The pivotally adjustable position of the anvil relative to the anvil support makes it possible to align the cutting edge and the contact surface particularly parallel at the cutting position, and more preferably, over the entire cooperative extension length in which the cutting edge contacts the contact surface at the cutting position. No further auxiliary means are required for this purpose.

[0013] After the initial alignment of the contact surface by the cutting edge of the cutting knife, the anvil remains in the position adjusted by the cutting knife based on a specified pivotable modified configuration, so that the contact surface is aligned to the cutting edge.

[0014] This configuration of the present invention particularly ensures optimal alignment of the cutting surface with respect to the cutting edge. This allows the angular deviation of the cutting edge with respect to the contact surface between the resting position and the cutting position to be automatically compensated by the first movement of the cutting edge to the cutting position, so that the contact surface is optimally aligned with the cutting edge at the cutting position.

[0015] The configuration of the pivotal connection between the anvil support and the anvil is basically freely selectable, but particularly preferably, the anvil is pivotally connected to the anvil support in order to align the contact surface particularly parallel to the cutting edge at the cutting position. At least two contact surfaces are preferably arranged on the anvil circumferential surface that extends at a distance from the pivot axis of the anvil to the anvil support, by a pivotal connection, so that the contact surfaces can be particularly easily aligned particularly parallel to the cutting edge by rotation around the pivot axis. Similarly, a corresponding improvement of the present invention allows for easy repositioning of the contact surfaces. To do this, the anvil is simply rotated around the pivot axis until an alternative contact surface is positioned facing the cutting edge at the operating position.

[0016] The anvil can be fixed to the anvil support in the operating position by any means, for example, by coupling elements that act in a shape-connective manner. However, in a particularly advantageous configuration of the present invention, the anvil is force-connectively coupled to the anvil support in the operating position, and is specifically screw-fastened to the anvil support with a specified preload force.

[0017] This configuration of the present invention allows for particularly easy and comfortable adjustment of the contact surface of the anvil with respect to the cutting edge of the cutting knife. For adjusting the anvil with respect to the anvil support, it is only necessary to release any existing force-connective couplings, particularly screw fastenings or lockings, and thereby subsequently adjust the anvil accordingly, particularly by rotating it about the longitudinal axis of the screw fastening or locking. The cutting device can be further improved and configured with a force-connective coupling, particularly a screw fastening or locking with a specified preload force, so that the cutting edge aligns the contact surface with respect to the cutting edge, particularly parallel to the cutting edge, at the cutting position. The force-connective coupling, particularly the specified preload force, can produce a pivotable adjustment by force acting on the anvil via the cutting knife, and the adjusted position is then maintained by the force-connective coupling, particularly by the preload force, so that the anvil remains fixed in place relative to the cutting knife during further operation of the cutting device.

[0018] To this end, it is particularly preferred that the anvil is coupled to an anvil support in an adjustable, pivotable manner against spring forces in the operating position, and especially in a rotatably pivotable manner, and is screw-fastened to the anvil support, particularly when a spring element acting in the direction of the preload force is used.

[0019] By advantageously fixing the anvil to the anvil support in the operating position under the use of spring force, and particularly by screwing or locking the anvil to the anvil support under the use of a spring element acting in the direction of the preload force of screw fastening or locking, the pivotal adjustability of the anvil relative to the anvil support in cooperation with the cutting edge can be ensured particularly easily and reliably, and after the adjustment movement, the particularly secure fixed position of the anvil on the anvil support at the position adjusted by the cutting knife is ensured.

[0020] According to an improved embodiment of the present invention, it is further specified that the distance of the cutting knife from the contact surface at the resting position is adjustable to be selected as necessary in relation to the thickness of the thread. Thus, preferably, the relative position or distance between the cutting edge and the anvil can be adjusted as necessary in relation to the thickness of the thread to be cut by changing the axial position of the anvil and / or the cutting edge. This ensures that sufficient impact is generated to cut the thread.

[0021] The number of contact surfaces provided on the anvil is basically freely selectable. However, according to a particularly advantageous configuration of the present invention, the anvil has four contact surfaces, which are particularly preferably evenly distributed around the entire circumference of the anvil. However, it is also possible to optionally provide more than four contact surfaces. This number may be selected to ensure that the thread is reliably cut by the relative movement of the cutting knife against the contact surfaces.

[0022] According to this configuration of the present invention, the anvil is formed as a planar, polygonal, particularly rectangular, and especially preferably square element, and this element has four contact surfaces on its circumferential surface, each adjacent to the others at substantially 90° angles. Alternatively, an anvil configuration as a pentagonal, hexagonal, or other element is also conceivable. If the anvil is advantageously rotatably coupled to an anvil support, and the axis of rotation preferably extends through the center point of the anvil at equal intervals from the contact surfaces, then the contact surface cooperating with the cutting edge can be selected by simply rotating the anvil by a corresponding angular value, for example, 90° for a square element or 60° for a hexagonal element. Overall, this configuration of the present invention allows for multiple repositioning of the contact surface engaging with the cutting edge. Thus, for example, three repositionings are possible for a square element and five for a hexagonal element, thereby extending the service life.

[0023] In a preferred configuration of the present invention, at least the contact surface of the anvil or the anvil forming the contact surface is specified to have a hardness 5% to 15% lower than that of the cutting edge. This configuration of the present invention ensures a particularly good service life for the cutting knife, and wear occurring on the contact surface of the anvil is compensated by the anvil having at least two, preferably at least four, contact surfaces, which are preferably arranged in succession, for example, facing the cutting edge in the operating position after reaching a certain wear limit. In a further preferred configuration, the cutting edge of the cutting knife may be arranged and fixed in a way that makes it replaceable on the cutting knife, or the cutting knife with the cutting edge replaceable on the cutting knife support.

[0024] According to a particularly preferred configuration of the present invention, the anvil is characterized by being formed from a sintered material, which enables the manufacture of a contact surface or anvil having a desired hardness in a particularly simple and inexpensive manner. For example, the contact surface or the anvil forming the contact surface may be formed from a material such as FD-0205-HT, which is a commercially available material.

[0025] According to a more preferred configuration of the present invention, at least the cutting edge or the cutting knife forming the cutting edge is made of a wear-resistant material having high hardness, the material having a ratio of at least 4% chromium and at least 4% vanadium. Such materials are known by trade names such as ASP2009, ASP2011, ASP2030, Boehler S390, CMP V9, and CMP V10. This can improve the wear resistance and thus the service life of the cutting knife.

[0026] According to a preferred configuration of the present invention, at least the cutting edge, or alternatively the cutting knife that supports the cutting edge in a fixed position relative to the cutting knife, is supported so as to be rotatable freely relative to the adjustment movement axis of the adjustment movement of the cutting edge between the rest position and the cutting position by a defined angular value about a rotation axis extending perpendicular to the central axis of the cutting edge or the cutting knife. Preferably, the defined angle is 0° to 15° (including 15°), more preferably 0° to 10° (including 10°), and particularly preferably 0° to 5° (including 5°). The rotatable support device may be realized by a normal support form that causes rotation. The support device is particularly preferably formed so as to enable a rotational movement within one rotational movement plane by a defined angular value on both sides relative to the adjustment movement axis of the cutting device. As an inexpensive support device form, for example, a kind of hinge device is provided. This hinge device may preferably be formed by an engagement element and an engagement housing portion. For example, the engagement element may be configured in a conical shape or a frustum of a cone shape, and the engagement housing portion has a first housing section for housing one section of the circumferential surface of the conical or frustum of a cone-shaped engagement element, and a second housing section following the first housing section for housing the free end section of the engagement element. The limitation of the free rotatability is preferably realized by a gap dimension that defines an angular value between the corresponding contact surfaces of the first housing section and the circumferential surface section of the engagement element to be arranged therein, and / or between the corresponding contact surfaces of the second housing section and the free end section of the engagement element to be arranged therein. Further, alternatively or additionally thereto, the cutting knife or the cutting edge may have an outer contact surface that contacts a corresponding contact surface for restricting the rotatability when a defined angular value is obtained.

[0027] The rotatable support device of at least the cutting edge or the cutting knife provided with the cutting edge enables the alignment of the cutting edge with respect to the anvil, thereby preventing the occurrence of burrs that impair the cutting output.

[0028] According to another aspect of the present invention, a yarn clearer is proposed. The yarn clearer according to the present invention that can be arranged in the working unit of the fiber machine is characterized by having the cutting device according to the present invention described above or a cutting device as an improved form. The yarn clearer according to the present invention is excellent in terms of its high cutting quality and long service life that does not require anvil replacement.

[0029] One embodiment of the present invention will be described with reference to the drawings.

Brief Description of the Drawings

[0030] [Figure 1] It is a perspective exploded view of one embodiment of the cutting device.

[0031] FIG. 1 shows a perspective view of one embodiment of a cutting device 1 including an anvil 2 removed from an anvil support 7.

[0032] The cutting device 1 has a cutting knife driving device 6. By this cutting knife driving device 6, a cutting knife 4 that is replaceably arranged on a cutting knife support 5 is moved from a rest position where a cutting edge 20 is spaced from a contact surface 3 provided on the anvil 2 to a cutting position (not shown here) where the cutting edge 20 contacts the contact surface 3 provided on the anvil 2.

[0033] The anvil 2 has a total of four contact surfaces 3 evenly distributed over the entire circumference in the illustrated embodiment. By these contact surfaces 3, it is possible to fix the anvil 2 to the anvil support 7 at a total of four positions in the operating position. For this purpose, the anvil support 7 has a fixing section 18. The lower surface 17 of the anvil 2 is placed on the upper surface 19 of this fixing section 18 in the operating position. To fix the anvil 2 to the fixing section 18, the fixing section 18 has a threaded hole 8. This threaded hole 8 serves to accommodate a fixing screw 9. This fixing screw 9 extends through a central through hole 12 provided in the anvil 2 in the operating position and is screwed into the threaded hole 8 in a threaded section 14.

[0034] In the operating position of the anvil 2, adjusted relative to the anvil support 7 by the fixing screw 9, a spring element 10, coaxially positioned with respect to the fixing screw 9 and formed by a spring ring, contacts the stepped portion 15 of the anvil 2 and the stepped portion 11 extending adjacent to the connecting portion 16 of the fixing screw 9. The preload force that can be generated via the fixing screw 9, which fixes the anvil 2 to the anvil support 7, is particularly advantageously adjustable via the spring element 10. At this time, during the initial movement of the cutting knife 4 to the cutting position, the anvil 2 is adjusted about the longitudinal axis of the fixing screw 9 by the cooperation of the cutting edge 20 and the anvil 2, thereby aligning the cutting edge 20 parallel to the contact surface 3. At this time, the preload force is then sufficient to fix the anvil 2 in the adjusted position.

[0035] The cutting knife support 5 is rotatably supported by the cutting knife drive device 6 via a hinge device 21, with respect to the longitudinal axis of the fixing screw 9. The hinge device 21 is formed from a housing portion 22 in the cutting knife support 5 and an engaging element (not shown) located on the cutting knife drive device 6 and engaging with the housing portion 22. The hinge device 21 allows the cutting knife support 5, and thus the cutting knife 4 or cutting edge 20, to rotate on both sides of the adjustment motion axis of the cutting device 1 within a single rotation plane by a specified angular value. [Explanation of symbols]

[0036] 1 cutting device 2 Anvils 3 Contact surface 4 Cutting knives 5 Cutting knife support 6. Cutting knife drive device 7 Anvil Support 8 threaded holes 9 Fixing screws 10 Spring elements 11 Stepped section 12 Through holes 14 Thread divisions 15 Stepped section 16 Consolidation category 17 Bottom side 18 Fixed category 19 Top side 20 Cutting Edges 21 Hinge device 22 Storage Unit

Claims

1. A cutting device (1) for a yarn clearer that can be arranged in an operating unit of a textile machine, comprising: a cutting knife (4) with a cutting edge (20) movable between a rest position and a cutting position; an anvil (2) arranged in an operating position on an anvil support (7), in which an abutment surface (3) provided on the anvil (2) cooperates with the cutting edge (20) of the cutting knife (4) in the cutting position; A cutting device (1) comprising: The anvil (2) is - has at least two abutment surfaces (3) that can be positioned against the anvil support (7) in said operating position, - adjustably arranged on said anvil support (7) for selecting an abutment surface (3) which can be brought into interacting relationship with said cutting edge (20); A cutting device (1) characterized in that:

2. 2. Cutting device (1) according to claim 1, characterized in that the anvil (2) is arranged detachably on the anvil support (7).

3. 3. The cutting device (1) according to claim 1 or 2, characterized in that in the operating position, the anvil (2) is pivotally connected to the anvil support (7) so that the cutting edge (20) aligns the abutment surface (3) in a fixed position relative to the cutting edge (20) in the cutting position.

4. 3. The cutting device (1) according to claim 1 or 2, characterized in that the anvil (2) is pivotally connected to the anvil support (7) for aligning the abutment surface (3) parallel to the cutting edge (20) in the cutting position.

5. 3. The cutting device (1) according to claim 1 or 2, characterized in that in the operating position the anvil (2) is forcefully connected to the anvil support (7), in particular by screwing to the anvil support (7) with a defined preload force.

6. 3. The cutting device (1) according to claim 1 or 2, characterized in that the anvil (2) is connected to the anvil support (7) in an adjustably pivotable, in particular rotationally pivotable, manner against a spring force in the operating position, and is screwed to the anvil support (7) in particular with the use of a spring element (10) acting in the direction of the preload force.

7. 3. The cutting device (1) according to claim 1 or 2, characterized in that the cutting knife (4) or the cutting edge (20) is supported so as to be freely rotatable by a specified angle about a rotation axis extending perpendicular to the central axis of the cutting edge (20) relative to the axis of adjustment movement of the cutting edge (20) between the rest position and the cutting position.

8. 3. Cutting device (1) according to claim 1 or 2, characterized in that the anvil (2) has four abutment surfaces (3) evenly distributed over its circumference.

9. 3. Cutting device (1) according to claim 1 or 2, characterized in that the abutment surface of the anvil (2) has a surface hardness that is 5% to 15% lower than that of the cutting edge (20).

10. 3. The cutting device (1) according to claim 1 or 2, characterized in that the cutting edge (20) is made of a wear-resistant material with high hardness, said material having a proportion of 4% chromium and at least 4% vanadium.

11. 3. Cutting device (1) according to claim 1 or 2, characterized in that the anvil (2) is made of sintered material.

12. A yarn clearer for a working unit of a textile machine, comprising a cutting device (1) for completely removing defects from the yarn, Thread clearer, characterized in that the cutting device (1) is constructed according to claim 1 or 2.

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