Yarn clearer and cutting device for a yarn clearer

Abstract

The invention relates to a clearer and to a cutting device for a clearer for a textile machine station for removing defects from a yarn. The invention also relates to a cutting device for a clearer which can be arranged on a textile machine station, having a cutting knife with a blade which can be adjusted between a rest position and a cutting position and an anvil which is arranged on an anvil seat in a working position in which a stop surface of the anvil cooperates with the cutting knife blade in the cutting position. In order to provide a clearer having a cutting device which is characterized by a long service life and a cutting device having a cutting knife and an anvil, it is provided that the anvil has at least two stop surfaces which can be arranged on the anvil seat in the working position and which can be adjustably arranged on the anvil seat in order to select the stop surface which can be brought into active engagement with the blade.

Description

TECHNICAL FIELD

[0001] The invention relates to a cutting device for a clearer which can be arranged at a work station of a textile machine, having a cutting knife with a blade which is adjustable between a rest position and a cutting position and an anvil which is arranged on an anvil seat in a working position in which a stop surface of the anvil cooperates with the blade of the cutting knife in the cutting position. BACKGROUND

[0002] In the production of yarn, it is generally sought to achieve as high a yarn consistency as possible within narrow tolerances and to achieve a yarn which is free of visible defects, such as intolerable thick or thin spots. To do this, so-called clearers are employed at some work stations of the textile machine, which continuously monitor, for example, the yarn diameter with suitable measuring heads. If an intolerable defect is detected because the limit value, which is referred to as the clearer limit, is exceeded or undershot, the defect is cut out of the yarn by means of a cutting device of the clearer, the yarn end is joined again and the production process is continued.

[0003] Cutting devices which are known for clearers are, for example, electromagnetically actuated, in which they are either constructed in the form of scissors or, in the manner described above, in the form of a chisel, wherein this construction is preferred because of the simple configuration.

[0004] The disadvantage of this configuration, however, is that the service life of the cutting knife which cooperates with the anvil is shorter than in the case of a cutting device which acts in the form of scissors, since a more severe wear occurs on the basis of the working method of the cutting device, in which the cutting knife blade strikes the anvil stop surface with a previously determined impact force in order to cut the yarn, which makes it necessary to replace the cutting knife or the anvil at regular intervals in order to maintain the same cutting efficiency. SUMMARY

[0005] In view of this, the invention is based on the task of providing a clearer having a cutting device and a cutting device having a cutting knife and an anvil, which cutting device is characterized by a long service life.

[0006] The invention fulfils this task by a cutting device and by a clearer.

[0007] The cutting device of the invention is characterized in that the anvil

[0008] - has at least two stop surfaces which are arranged on the anvil seat in the working position and

[0009] - is adjustably arranged on the anvil seat in order to select the stop surface which can be brought into effective engagement with the blade.

[0010] According to the application, at least two stop faces are formed on the anvil, which are spaced apart from one another, so that the anvil can be arranged on the anvil seat in two positions in the working position, in which one of the at least two stop faces is in each case in the cutting position in engagement with the blade of the cutting knife. Thus, if the anvil is not to be replaced, it is possible, for example, to adjust the anvil relative to the anvil seat when the first stop face is excessively worn, so that in the working position this second stop face then acts as a counter bearing opposite the blade of the cutting knife, between which the yarn can be severed as required.

[0011] In order to select a stop face which can be brought into effective engagement with the blade, the application provides that the anvil is arranged adjustably on the anvil seat. The adjustability here allows the selection of the stop face of the anvil which is opposite the blade in a comfortable manner as required. The connection of the anvil to the anvil seat is designed in such a way that it can be selected in principle freely with at least one of the at least two stop faces arranged in the working position.

[0012] According to a particularly advantageous design of the application, it is provided that the anvil is arranged detachably on the anvil seat. Detachability means that the anvil can be removed from the anvil seat without damage, in particular repeatedly. This design of the application allows the orientation of the anvil to be aligned in such a way that in the working position the desired stop face is in engagement with the blade of the cutting knife in a simple and comfortable manner. For example, the anvil can be separated from the anvil seat on the basis of the detachable connection as required as a result of wear of the first stop face, then aligned in the orientation by the operator and connected again to the anvil seat, so that in the working position the at least second stop face is in engagement with the blade of the cutting knife in the cutting position.

[0013] Reliable functioning of the cutting device and a long service life can be achieved in particular in that the blade of the cutting knife is aligned in the cutting position parallel to the stop face of the anvil in the orientation, so that not only uniform loading of the stop face and the blade is ensured, but also a clean cut of the yarn to be cut by the cutting device. According to an improvement of the application, it is provided that the anvil is connected to the anvil seat in the working position in such a way that the blade in the cutting position aligns the stop face in the orientation in particular parallel to one another, independently of the position of the blade.

[0014] According to this design of the application, it is provided that the alignment of the anvil in the working position relative to the cutting knife, which is connected to the anvil seat, can be changed as a result of its articulated arrangement on the anvil seat. Thus, after the anvil has been arranged for the first time on the anvil seat in the working position, it is possible by means of the blade being displaced for the first time from the rest position into the cutting position to adjust the stop face by means of the blade relative to the anvil seat, so that the stop face is aligned in the orientation in particular parallel to the blade. The articulated adjustment of the anvil relative to the anvil seat allows the blade and the stop face to be aligned in the cutting position in the orientation in particular parallel to one another, more preferably in the range of the entire extension with which the blade comes into contact with the stop face in the cutting position, without further auxiliary mechanisms being required for this purpose.

[0015] After the initial alignment of the stop face to the direction by means of the blade of the cutting knife, the anvil then remains in the position set by the cutting knife as a result of the predetermined hinged adjustment, so that the stop face is aligned to the direction without change in position relative to the blade.

[0016] This design of the invention reliably ensures optimum alignment of the blade to the direction. The angular deviation of the blade relative to the stop face between the rest position and the cutting position can thus be automatically compensated for by the initial first displacement of the blade to the cutting position, in which the stop face is aligned to the direction relative to the blade in the optimum manner.

[0017] Here, the design principle of the hinged connection of the anvil to the anvil seat is freely selectable, wherein it is particularly preferred to provide that the anvil is hingedly connected to the anvil seat in order to align the stop face in particular parallel to the direction relative to the blade in the cutting position. The hinged connection of at least two stop faces, which are preferably arranged on the circumferential surface of the anvil spaced apart from the axis of rotation of the anvil with the anvil seat, allows the stop face to be aligned in particular parallel to the direction relative to the blade in a very simple manner by rotating about the axis of rotation. A corresponding development of the invention also allows the stop face to be easily exchanged, where the anvil for this purpose only has to be rotated about the axis of rotation until the alternative stop face is opposite the blade in the working position.

[0018] The fixing of the anvil to the anvil seat in the working position can be achieved by any mechanism, for example by a form-fitting connection. According to a very advantageous design of the invention, however, it is provided that the anvil is connected to the anvil seat in the working position in a force- transmitting manner, in particular with a screw connection provided with a predetermined pretension.

[0019] This design of the invention allows the anvil to be adjusted relative to the blade of the cutting knife in a particularly simple and comfortable manner. In order to adjust the anvil relative to the anvil seat, it is only necessary to detach the existing force-transmitting connection, in particular a screw connection or a lock, so that the anvil can then be adjusted accordingly, in particular rotated about the longitudinal axis of the screw connection or the lock. Furthermore, by virtue of the design of the force-transmitting connection, in particular a screw connection provided with a predetermined pretension, the cutting device can be designed in an improved manner in a very simple and comfortable manner, according to which the blade aligns the stop face relative to the blade in the cutting position without change in position, in particular parallel to the direction. The force-transmitting connection, in particular the predetermined pretension, is designed here in such a way that a hinged adjustment can be effected by means of the force acting on the anvil by the cutting knife and subsequently the set position is maintained by the force-transmitting connection, in particular the pretension, so that the anvil is fixed without change in position relative to the cutting knife when the cutting device is in operation.

[0020] It is particularly advantageous for this purpose to provide that the anvil is hingedly connected, in particular hingedly connected in rotation, to the anvil seat in the working position against the spring force, in particular using a spring element acting in the direction of the pretension and a screw connection to the anvil seat.

[0021] The setting of the anvil in the working position on the anvil seat, preferably in the case of the use of spring forces, in particular in the case of the threaded connection or locking of the anvil to the anvil seat using spring elements acting in the direction of the pretensioning force of the threaded connection or locking, allows the possibility of the articulation adjustment of the anvil on the anvil seat in cooperation with the blade in a particularly simple and reliable manner, wherein the anvil is reliably and positionally secured in the position set by the cutting blade after the adjustment movement.

[0022] According to an advantageous embodiment of the application, the distance of the blade from the stop surface in the rest position is adjusted as required depending on the yarn thickness. Thus, the relative position or distance between the blade and the anvil can preferably be adjusted as required depending on the yarn thickness to be cut by means of a change in the axial position of the anvil and / or the blade. In this way, it is possible to reliably ensure that a sufficient impulse is generated for the separation of the yarn.

[0023] The number of stop surfaces on the anvil can in principle be freely selected. According to an advantageous embodiment of the application, however, it is provided that the anvil has four stop surfaces, which are preferably evenly distributed around the anvil. However, it is also possible to provide more than four stop surfaces. The number can be selected in such a way that reliable cutting of the yarn is ensured by the relative movement of the cutting blade with respect to the stop surfaces.

[0024] According to this embodiment of the application, the anvil is designed as a flat, quadrangular, in particular rectangular, and preferably square element, which has four stop surfaces on its peripheral surface, which adjoin one another at an angle of substantially 90° each. It is also conceivable to design the anvil as a pentagonal, hexagonal or the like element. In the case of the preferably rotationally articulated connection of the anvil to the anvil seat, wherein the axis of rotation preferably extends through the center of the anvil at a uniform distance from the stop surfaces, the stop surfaces cooperating with the blade can be selected by a simple rotation of the anvil by a corresponding angle, for example 90° in the case of a square element and 60° in the case of a hexagonal element. Overall, this embodiment of the application allows a plurality of changes of the stop surface in contact with the blade. In the case of a square element, for example, three changes are thus possible, and in the case of a hexagonal element, five changes are possible, whereby a longer service life is achieved.

[0025] According to a preferred embodiment of the application, at least the stop surfaces of the anvil or the anvil forming the stop surfaces have a hardness of 5% to 15% less with respect to the blade. This embodiment of the application ensures a good service life of the cutting blade, wherein the occurring wear of the stop surfaces of the anvil is compensated in such a way that the anvil has at least two, preferably at least four stop surfaces, which are preferably in succession opposite the blade in the working position, for example after a certain wear limit has been reached. Furthermore, according to a preferred embodiment, the blade of the cutting blade is exchangeably mounted and secured on the cutting blade, or the cutting blade with the blade is exchangeably mounted and secured on the cutting blade seat.

[0026] According to a particularly preferred design of the application, the anvil consists of a sintered material, which allows the stop face or the anvil forming the stop face to be produced very simply and inexpensively with the desired hardness. For example, the stop face or the anvil forming the stop face can consist of a material such as the commercially generally known material FD-0205-HT.

[0027] According to a further preferred design of the application, at least the blade or the cutting knife forming the blade consists of a high-hardness wear-resistant material, wherein the material has a content of at least 4% chromium and at least 4% vanadium. Such materials are known, for example, under the trade names ASP 2009, ASP 2011, ASP 2030, S390, CMP V9, CMP V10, etc. are known. The wear resistance and in turn the service life of the cutting knife can thus be improved.

[0028] According to a preferred design of the application, at least the blade or, alternatively, the cutting knife carrying the blade in a position fixed relative to the cutting knife, is mounted rotatably about an axis of rotation extending perpendicular to the central axis of the blade or the cutting knife about the adjustment axis of movement of the adjustment movement of the cutting device between the rest position and the cutting position. The prescribed angle is preferably between 0° and 15° inclusive, more preferably 0° and 10° inclusive, and particularly preferably 0° and 5° inclusive. The rotatable bearing can be realized by means of common rotational bearings. The bearing is particularly preferably designed to allow a rotational movement in the plane of rotation by a prescribed angle on both sides of the adjustment axis of movement of the cutting device. As a low-cost bearing variant, for example, a hinge mechanism is prescribed. The hinge mechanism can preferably be composed of an insert and a socket. For example, the insert can be designed conically or frustoconically, wherein the socket has a first receiving portion for receiving a portion of the peripheral surface of the conical or frustoconical insert and a second receiving portion adjoining the first receiving portion for receiving the free end of the insert. The limitation of the free rotational mobility can preferably be realized by means of a gap size of a prescribed angle between the stop surfaces corresponding to one another in the first receiving portion and the peripheral surface portion to be accommodated therein and / or in the second receiving portion and the free end of the insert to be accommodated therein. Also as an alternative or in addition thereto, the cutting knife or the blade can have an outer stop surface which, when a prescribed angle is reached, abuts against a counter stop surface to limit the rotational mobility.

[0029] The rotational bearing of at least the blade or the cutting knife with the blade allows the blade to be aligned relative to the anvil in a direction of alignment, whereby the occurrence of burrs which adversely affect the cutting efficiency can be counteracted.

[0030] According to another aspect of the invention, a yarn clearer is provided. The yarn clearer according to the invention, which can be mounted on a textile machine, is characterized by having the aforementioned cutting device according to the invention or an improvement thereof. The yarn clearer of the invention is characterized by its high cutting quality and long service life, eliminating the need for anvil replacement. Attached Figure Description

[0031] One embodiment of the present invention will be explained with reference to the figures shown:

[0032] Figure 1 An exploded perspective view showing an embodiment of the cutting device.

[0033] List of reference numerals

[0034] 1. Cutting device

[0035] 2 anvils

[0036] 3 Stop surface

[0037] 4. Cutting knife

[0038] 5. Cutting knife holder

[0039] 6. Cutting drive mechanism

[0040] 7 Anvil

[0041] 8 Threaded holes

[0042] 9 Fastening screws

[0043] 10 Spring components

[0044] 11 shoulder

[0045] 12 Through Holes

[0046] 14 Threaded section

[0047] 15 shoulder

[0048] 16 Joint

[0049] 17. Bottom side

[0050] 18 Fastening parts

[0051] 19 Top side

[0052] 20 blades

[0053] 21. Hinge Mechanism

[0054] 22 Containers Detailed Implementation

[0055] Figure 1An embodiment of the cutting device 1 with the anvil 2 detached from the anvil seat 7 is shown in perspective view.

[0056] The cutting device 1 has a cutter drive mechanism 6, by means of which the cutter 4, which is replaceably arranged on the cutter seat 5, can be moved from a rest position, in which the cutting edge 20 is arranged spaced apart from the stop face 3 of the anvil 2, to a cutting position, which is not shown here, in which the cutting edge 20 lies against the stop face 3 of the anvil 2.

[0057] The anvil 2 has, in the embodiment shown, four stop faces 3, which are uniformly distributed around the circumference, which allow the anvil 2 to be fixed in the working position on the anvil seat 7 in four positions. To this end, the anvil seat 7 has fastening portions 18, on the top side 19 of which the anvil 2, in the working position, is arranged with its bottom side 17. In order to fix the anvil 2 on the fastening portion 18, the fastening portion has a threaded hole 8 for receiving a fixing screw 9, which, in the working position, extends through a central through-hole 12 in the anvil 2 and is screwed into the threaded hole 8 with a threaded portion 14.

[0058] In the working position of the anvil 2 on the anvil seat 7, which is set by the fixing screw 9, a spring element 10, which is arranged coaxially to the fixing screw 9 and is formed by a spring ring, extends against a shoulder 15 of the anvil 2 and a shoulder 11, which adjoins the engagement portion 16 of the fixing screw 9. By means of the spring element 10, the fixing of the anvil 2 on the anvil seat 7, which can be produced by a pretensioning force of the fixing screw 8, can be adjusted in a particularly advantageous manner in that, in a first adjustment of the cutter 4 to the cutting position, it is adjusted around the longitudinal axis of the fixing screw 9 by the cooperation of the cutting edge 20 with the anvil 2 in such a way that the cutting edge 20 is aligned parallel to the alignment direction of the stop face 3. The pretensioning force is sufficient here for subsequently fixing the anvil 2 in the set position.

[0059] The cutter seat 5 is mounted on the cutter drive mechanism 6 in a prescribed rotary movement around the longitudinal axis of the fixing screw 9. The hinge mechanism 21 consists of a receiving slot 22 on the cutter seat 5 and an insert, which is not shown, which is arranged on the cutter drive mechanism 6 and is inserted into the receiving slot 22. The hinge mechanism 21 allows a rotary movement of the cutter seat 5 and, in turn, of the cutter 4 or the cutting edge 20 in a prescribed angle value in one rotary plane on both sides of the adjustment movement axis of the cutting device 1.

Claims

1. A cutting device (1) for a yarn clearer that can be mounted on a station of a textile machine, the cutting device (1) comprising: - A cutter (4), the cutter (4) having a blade (20) adjustable between a rest position and a cutting position, and - An anvil (2) is placed on an anvil seat (7) in the working position, wherein the stop surface (3) of the anvil (2) engages with the blade (20) of the cutter (4) in the cutting position. Its characteristics are, The anvil (2) - It has at least two stop surfaces (3) that can be placed on the anvil (7) in the working position, and - In order to select the stop surface (3) that can be placed to effectively engage with the blade (20), it can be adjustablely positioned on the anvil (7). The anvil (2) is hinged to the anvil seat (7) in the working position, such that the blade (20) in the cutting position aligns the stop surface (3) parallel to the position of the blade (20). The anvil (2) is hinged to the anvil seat (7) in an adjustable manner in the working position in opposition to the spring force.

2. The cutting device (1) according to claim 1, characterized in that, The anvil (2) is detachably mounted on the anvil seat (7).

3. The cutting device (1) according to claim 1, characterized in that, The anvil (2) is rotatably hinged to the anvil seat (7) so as to be aligned parallel to the stop surface (3) relative to the blade (20) in the cutting position.

4. The cutting device (1) according to claim 1, characterized in that, The cutter (4) or the blade (20) is mounted so that it can rotate freely between the rest position and the cutting position about a rotation axis extending perpendicular to the central axis of the blade (20) at a predetermined angle relative to the adjustment motion axis of the blade (20).

5. The cutting device (1) according to claim 1, characterized in that, The anvil (2) has four stop surfaces (3) evenly distributed around it.

6. The cutting device (1) according to claim 1, characterized in that, The stop surface of the anvil (2) has a surface hardness that is 5% to 15% smaller than that of the blade (20).

7. The cutting device (1) according to claim 1, characterized in that, The blade (20) is made of a wear-resistant material with high hardness, wherein the material has a content of 4% chromium and at least 4% vanadium.

8. The cutting device (1) according to claim 1, characterized in that, The anvil (2) is made of sintered material.

9. The cutting device (1) according to claim 1, characterized in that, The anvil (2) is threadedly connected to the anvil seat (7) in the working position with a specified preload in a force-transmitting manner.

10. The cutting device (1) according to claim 1, characterized in that, The anvil (2) is rotatably hinged to the anvil seat (7) in the working position in the opposite direction to the spring force.

11. The cutting device (1) according to claim 1, characterized in that, The anvil (2) in the working position uses a spring (10) acting in the direction of preload force in the opposite direction to the spring force to be threadedly connected to the anvil seat (7).

12. A yarn clearer for a station on a textile machine, the yarn clearer having a cutting device (1) for removing defects from the yarn, characterized in that, The cutting device (1) is configured according to any one of claims 1 to 11.

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