YARN CLEARER AND CUTTING DEVICE FOR A YARN CLEARER

Abstract

The present invention relates to a yarn clearer for a workstation of a textile machine with a cutting device for clearing out defects from a yarn, as well as a cutting device for a yarn clearer which is configured to be arranged on a workstation of a textile machine, with a cutting knife with a cutting edge adjustable between a rest position and a cutting position, and an anvil arranged on an anvil carrier in an operating position in which a stop surface of the anvil interacts with the cutting edge of the cutting knife in the cutting position. In order to provide a yarn clearer with a cutting device as well as a cutting device with a cutting knife and an anvil, which is characterised by a long service life, there is provision for the anvil to have at least two stop surfaces which are configured to be arranged on the anvil carrier in the operating position and is adjustably arranged on the anvil carrier for the selection of the stop surface which is configured to be brought into an active connection with the cutting edge.

Claims

1. A cutting device (1) for a yarn clearer, configured to be arranged at a workstation of a textile machine, comprising: a cutting knife (4) comprising a cutting edge (20), wherein the cutting edge (20) is configured to be adjustable between a rest position and a cutting position; and an anvil (2), positioned on an anvil carrier (7), wherein the anvil (2): is positioned on the anvil carrier (7) in an operating position in which a stop surface (3) of the anvil (2) is configured to interact with the cutting edge (20) of the cutting knife (4) when the cutting edge (20) is in the cutting position, comprises at least two stop surfaces (3) which are configured to be arranged on the anvil carrier (7) in the operating position, and is configured to be adjustably arranged on the anvil carrier (7) in order to select which of the at least two stop surfaces (3) is to be brought into an active connection with the cutting edge (20).

2. The cutting device (1) according to claim 1, wherein the anvil (2) is detachably positioned on the anvil carrier (7).

3. The cutting device (1) according to claim 1, wherein, when the anvil (2) is in the operating position and the cutting edge (20) is in the cutting position, the cutting edge (20) is configured to align the stop surface (3) in a fixed location with respect to the cutting edge (20).

4. The cutting device (1) according to claim 1, wherein the anvil (2) is connected to the anvil carrier (7) by a rotary joint configured to enable parallel alignment of the stop surface (3) with respect to the cutting edge (20), when the cutting edge (20) is in the cutting position.

5. The cutting device (1) according to claim 1, wherein the anvil (2), when in the operating position, is frictionally connected to the anvil carrier (7).

6. The cutting device (1) according to claim 1, wherein the anvil (2), when in the operating position, is connected to the anvil carrier (7) in an articulated manner so as to be adjustable against a spring force.

7. The cutting device (1) according to claim 1, wherein the cutting knife (4) or the cutting edge (20) is mounted so as to be freely rotatable about a rotary axis extending perpendicular to a center axis of the cutting edge (20) by a defined angular amount relative to an adjustment movement axis of an adjustment movement of the cutting edge (20) between the rest position and the cutting position.

8. The cutting device (1) according to claim 1, wherein the anvil (2) comprises four stop surfaces (3) evenly distributed over a circumference.

9. The cutting device (1) according to claim 8, wherein each stop surface (3) of the anvil (2) has a surface hardness that is 5% to 15% lower than a surface hardness of the cutting edge (20).

10. The cutting device (1) according to claim 1, wherein the cutting edge (20) comprises a wear-resistant material having a content of 4% chromium and of at least 4% vanadium.

11. The cutting device (1) according to claim 1, wherein the anvil (2) comprises a sintered material.

12. A yarn clearer for a workstation of a textile machine with a cutting device (1) for clearing out defects from a yarn, wherein the cutting device (1) is configured according to claim 1.

13. The cutting device (1) according to claim 5, wherein the anvil (2), when in the operating position, is screwed to the anvil carrier (7) with a defined pretensioning force.

14. The cutting device (1) according to claim 13, wherein the anvil (2) is screwed onto the anvil carrier (7) using a spring element (10) acting in a direction of the pretensioning force.

15. The cutting device (1) according to claim 6, wherein the articulated manner comprises a rotary joint.

Description

[0033] An embodiment example of the invention is explained with reference to the drawing. In the drawing:

[0034] FIG. 1 shows, in an exploded view, a perspective view of an embodiment of a cutting device.

[0035] FIG. 1 shows, in a perspective view, an embodiment of a cutting device 1 with an anvil 2 dismounted from an anvil carrier 7.

[0036] The cutting device 1 has a cutting knife drive 6, by means of which a cutting knife 4, which is interchangeably arranged on a cutting knife carrier 5, can be moved from a rest position, in which a cutting edge 20 is arranged at a distance from a stop surface 3 of the anvil 2, into a cutting position, not shown here, in which the cutting edge 20 rests against the stop surface 3 of the anvil 2.

[0037] In the embodiment example shown, the anvil 2 has a total of four stop surfaces 3 evenly distributed over the circumference, which make it possible to fix the anvil 2 in a total of four positions in an operating position on the anvil carrier 7. For this purpose, the anvil carrier 7 has a fastening section 18, on the upper side 19 of which the anvil 2 rests with an underside 17 in the operating position. To fix the anvil 2 to the fastening section 18, the latter has a threaded hole 8 which serves to receive a fastening screw 9 which, in the operating position, extends through a central through-bore 12 in the anvil 2 and is screwed into the threaded hole 8 by a threaded section 14.

[0038] In the operating positions of the anvil 2 set by the fastening screw 9 on the anvil carrier 7, a spring element 10 arranged coaxially with respect to the fastening screw 9 and formed by a spring ring abuts a shoulder 15 of the anvil 2 and a shoulder 11 extending adjacent to a coupling section 16 of the fastening screw 9. The pretensioning force which fixes the anvil 2 to the anvil carrier 7 and which can be generated via the fastening screw 8 can be adjusted via the spring element 10 in a particularly advantageous manner in such a way that, during a first adjustment of the cutting knife 4 into the cutting position, through the interaction of the cutting edge 20 with the anvil 2, the latter is adjusted about the longitudinal axis of the fastening screw 9 in such a way that the cutting edge 20 is aligned parallel to the stop surface 3. The pretensioning force is sufficient to subsequently fix the anvil 2 in the set position.

[0039] The cutting knife carrier 5 is mounted on the cutting knife drive 6 for defined rotary movement about the longitudinal axis of the fastening screw 9 via a hinge device 21. The hinge device 21 is formed from a receptacle 22 on the cutting knife carrier 5 and an engagement element, not shown, which is arranged on the cutting knife drive 6 and engages in the receptacle 22. The hinge device 21 permits a rotary movement of the cutting knife carrier 5 and thus of the cutting knife 4 or cutting edge 20 by a defined angular amount in a plane of rotation on either side of the adjustment movement axis of the cutting device 1.

[0040] List of reference signs

TABLE-US-00001 1 Cutting device 2 Anvil 3 Stop surface 4 Cutting knife 5 Cutting knife carrier 6 Cutting knife drive 7 Anvil carrier 8 Threaded hole 9 Fastening screw 10 Spring element 11 Shoulder 12 Through-bore 14 Threaded section 15 Shoulder 16 Coupling section 17 Underside 18 Fastening section 19 Upper side 20 Cutting edge 21 Hinge device 22 Receptacle