Yarn clearer and cutting mechanism for yarn clearer

Abstract

To provide a yarn clearer having a cutting mechanism assuring a reliable cutting off of a yarn when required and a cutting mechanism.SOLUTION: A cutting mechanism for a yarn clearer which can be provided at an operation unit of a textile machine comprises: a housing body having a housing substrate, a housing cover defining a housing inner chamber with the housing substrate and a first housing opening; and a cutting device having a cutting means support body having a cutting knife, a cutting means drive device provided in the housing inner chamber and moving the cutting means support body between a cutting position and a rest position and a drive element combining the cutting means drive device and the cutting means support body. The housing body has a support part for movably storing the cutting means support body and a second housing opening adjacent to the support part, extending vertically to a moving direction of the cutting means support body and having an opening edge in contact with the cutting means support body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cutting mechanism for a yarn clearer that can be arranged in a working unit of a textile machine, - a housing base, - a housing cover that at least partially covers the housing base and, together with the housing base, defines a housing inner chamber, - a housing body having a first housing opening and, - a cutting means support having a cutting knife, - a cutting means drive device arranged in the housing inner chamber for moving the cutting means support between a cutting position away from the housing and a rest position near the housing, - a drive element movably arranged in the first housing opening and coupling the cutting means drive device and the cutting means support and, a cutting device comprising:

[0002] During the production of yarn, usually, yarn with the highest possible uniformity within a narrow tolerance range and without visible defects such as unacceptable thick or thin spots is required. To achieve this, so-called yarn clearers are used in individual working units of the textile machine, and the yarn clearers continuously monitor, for example, the diameter of the yarn with a suitable measuring head. Based on whether a limit value called a clearing limit is exceeded or not, when an unacceptable defect is detected, the defect is cut off from the yarn by a cutting device arranged in the housing body of the cutting mechanism of the yarn clearer, the yarn ends are joined to each other again, and the production process is continued.

[0003] Known cutting devices for yarn clearers have, for example, a cutting means drive device that acts electromagnetically, and the cutting means support on which the cutting knife is arranged is moved between a rest position and a cutting position in the form of a chisel by the cutting means drive device, and the yarn arranged between the cutting means support and the anvil is separated at the cutting position.

[0004] In known cutting mechanisms, the cutting device is located within a housing body and is coupled to a cutting means support located inside or outside the housing via a drive element extending through a first housing opening, thereby enabling the cutting means support to engage with the thread via the drive element by a cutting means drive device.

[0005] The placement of the cutting device in the housing body is such that, at the mounting position of the yarn clearer, the cutting device is preferably positioned at the front end of the housing body relative to the yarn travel direction, thereby ensuring that the yarn guide area of ​​the yarn clearer is released from the yarn after cutting, based on the rotational inertia of the yarn winding package. However, positioning the cutting device in the entrance area of ​​the housing body relative to the yarn travel direction has the disadvantage that this area is subjected to a load due to the accumulation of more loose fibers caused by the system. This fiber load can cause fibers to be positioned in the area of ​​the first housing opening, even though the cutting device is surrounded by the housing body, and from there reach the interior of the housing. Inside the housing, the fibers increase friction in the area of ​​the cutting device, and consequently reduce the cutting force, resulting in an error-prone cutting process.

[0006] Based on this premise, the fundamental problem of the present invention is to provide a thread clearer and a cutting mechanism equipped with a cutting mechanism that ensures reliable thread separation when necessary.

[0007] The present invention solves this problem with a cutting mechanism having the features of claim 1 and a thread clearer having the features of claim 10. Advantageous improved forms of the cutting mechanism are described in dependent claims 2 to 9.

[0008] The cutting mechanism according to the present invention has a housing body, - A support portion for movably housing the cutting means support, - A second housing opening adjacent to the support portion, the second housing opening having an opening edge that extends perpendicular to the direction of movement of the cutting means support and is in contact with the cutting means support. It is characterized by having [this feature].

[0009] The housing body of the cutting mechanism according to the present invention comprises a housing base and a housing cover that at least partially covers the housing base. The housing cover and the housing base together define a housing chamber, in which a cutting means drive device of the cutting device is arranged. The housing body has a first housing opening for moving a cutting means support, which is formed with a cutting knife having a cutting edge and is located outside the housing chamber. This first housing opening is connected to the housing chamber, and a drive element extends through this first housing opening to connect the cutting means drive device to the cutting means support, thereby allowing the cutting means support to move between a resting position and a cutting position by the cutting means drive device. For this purpose, the drive element is movably located within the first housing opening.

[0010] The present invention further specifies that the housing body has a support portion in a region in front of the first housing opening, i.e., inside and outside the housing, for movably housing a cutting means support, the support portion having a second housing opening positioned opposite the first housing opening in the direction of movement of the cutting means support between a resting position and a cutting position. The second housing opening is formed such that an opening edge extending coaxially with respect to the direction of movement of the cutting means support is in contact with the cutting means support, while ensuring the movement of the cutting means support relative to the housing body between a cutting position and a resting position.

[0011] The present invention provides a configuration of a cutting mechanism comprising a housing body, which also surrounds the cutting means support in the area of ​​the support portion, and a second housing opening allows the cutting means support to move from a resting position near the housing to a cutting position away from the housing, where the cutting knife on the cutting means support cooperates with the contact surface to sever the threads between them, thereby ensuring that loose fibers do not reach the housing chamber where increased friction may occur, which could result in unreliable cutting performance.

[0012] According to an advantageous improved embodiment of the present invention, the housing body is characterized in that, in the region of the second housing opening, the end face of the cutting means support is positioned flush with the housing body in the resting position. In this configuration of the present invention, the preferably flat end face of the cutting means support, on which the cutting knife is positioned, extends in the same plane as the surface of the housing body surrounding the second housing opening in the resting position. To carry out the cutting process, the cutting means support is moved from a flush position relative to the housing body to a cutting position where the end face protrudes at least partially beyond the housing body or, in an alternatively preferred configuration, is positioned spaced apart from the housing body. The flush position of the end face in the resting position particularly ensures that, in the resting position, airborne fibers in the region of the cutting means support do not undesirably accumulate near the housing body. If such undesirable accumulation of fibers occurs, the airborne fibers are carried towards the housing chamber as the cutting means support moves, particularly when it moves back from the cutting position to the resting position. The flush arrangement at the resting position avoids edges that promote the accumulation of floating fibers, thus particularly reliably preventing the deposition of floating fibers in the region of the second housing opening.

[0013] In another configuration of the present invention, the first housing opening is specified to be in contact with the drive element by an opening edge that extends perpendicular to the direction of movement of the drive element. This configuration of the present invention, in which the opening edge of the first housing opening also performs a sealing function in addition to guiding the drive element in the housing body, further supplementally ensures that airborne fibers that may have entered the support portion through the second housing opening are not carried into the housing chamber where the cutting means drive device that drives the cutting means support via the drive element is located. Contamination of the housing chamber is supplementally prevented by the suitably specified configuration of the first housing opening.

[0014] The configuration of the support portion in the region between the first housing opening and the second housing opening, in which the cutting means support is movably positioned between a resting position and a cutting position, is basically freely selectable. According to a particularly advantageous configuration of the present invention, the support portion defined by the housing cover and the housing base is specified to have at least one wall portion positioned spaced apart from the cutting means support in order to form an expanded region.

[0015] According to this configuration of the present invention, the support portion is not in annular contact with the cutting means support, but rather at least one of the wall portions provided by the housing base and the housing cover is positioned spaced apart from the cutting means support when viewed laterally with respect to the direction of movement of the cutting means support between the resting position and the cutting position. With this configuration, the enlarged region is a free region between the first housing opening and the second housing opening, and this free region has a larger free cross-section than the free region of the second housing opening, so that any airborne fibers that may have entered the support portion through the first housing opening do not reach the second housing opening, despite the suction effect that occurs in the region of the second housing opening during the return movement of the cutting means support from the cutting position to the resting position, based on the enlarged housing portion and the pressure difference therefrom. The enlarged region reduces any negative pressure that may be present, based on its larger cross-section.

[0016] According to another configuration of the present invention, the cutting means support is characterized by having a projection that enters into the enlarged area and is movable within the enlarged area between a resting position and a cutting position. According to this configuration of the present invention, the cutting means support is characterized by having, for example, a web-shaped projection that extends across the entire width of the enlarged area, and, viewed lateral to the direction of movement of the cutting means support, to a wall portion located within the cutting means support and spaced apart from the cutting means support, thereby allowing the projection to carry away, through a second housing opening, any floating fibers that may have entered the enlarged area of ​​the support portion during the preceding movement from the cutting position to the resting position, when the cutting means support is moved from the resting position to the cutting position, thereby particularly reliably preventing the cutting device from being damaged by accumulated fibers.

[0017] According to another configuration of the present invention, the housing body is specified to have a ventilation opening for ventilating the housing chamber, preferably located on a surface of the housing body different from the first housing opening, particularly preferably on the lower surface of the housing body or on a surface of the housing body facing the first housing opening. According to this configuration of the present invention, the housing body has a ventilation opening that connects the perimeter of the housing body to the housing chamber, basically at any location, however preferably with respect to the mounting position of the cutting mechanism, on the surface of the housing body defined above, that is, on the surface of the housing body oriented in the opposite direction to the thread running direction.

[0018] As the drive element moves from the housing interior toward the first and second housing openings, generating negative pressure within the housing interior, ambient air flows into the housing interior through the ventilation openings during the movement of the cutting means support from the resting position to the cutting position. This prevents the generation of negative pressure within the housing interior, which could facilitate the intrusion of fibers in the areas of the first and second housing openings into the support portion and / or the housing interior. Furthermore, there is also the possibility of actively ventilating the housing interior through the ventilation openings, thereby generating positive pressure within the housing interior to supplementarily prevent the intrusion of airborne fibers.

[0019] According to another configuration of the present invention, the inner wall of the support portion and / or the outer surface of the cutting means support and / or the outer surface of the drive element are specified to have polished surfaces. The polished surface means an average surface roughness value Ra in the range of 0.01 to 0.2. The appropriate surface quality supplementarily prevents airborne fibers from accumulating on individual surfaces and reaching the support portion and / or the interior of the housing when the cutting means support moves. The polished surface facilitates the sliding off of airborne fibers.

[0020] The configuration of the housing base and housing cover for forming the housing body is basically freely selectable. For example, the housing base and housing cover may each be formed as a half-shell-shaped member that together defines the housing chamber and the support portion. However, according to an advantageous improved form of the present invention, the housing base is specified to have a flat inner wall of the housing base, and the housing cover is specified to have a housing cover edge portion erected in an annular manner on the inner wall of the housing base, and a housing cover base portion that continues from the housing cover edge portion.

[0021] According to this configuration of the present invention, the housing base provides a substantially flat inner wall of the housing base, and a half-shell-shaped housing cover is erected on this inner wall of the housing base with an annular housing cover edge, thereby positioning the housing cover base facing the inner wall of the housing base spaced apart from the flat surface of the housing base. This configuration of the present invention is a particularly simple possibility for manufacturing a housing body, and the inner wall of the housing base can be provided by another housing body of thread clearer. Furthermore, this configuration of the present invention provides the possibility of providing the support portion specified in the present invention and another advantageous configuration of the housing body solely by a corresponding configuration of the housing cover. Furthermore, according to a particularly advantageous improved embodiment of the present invention, the housing cover is specified to have a housing cover web that protrudes from the housing cover base toward the housing base and is erected on the flat inner wall of the housing base of the housing base in order to form a support portion.

[0022] The present invention further solves the problem with a yarn clearer for a working unit of a textile machine, which has a cutting mechanism for completely removing defects from yarn, and which has the cutting mechanism according to the present invention or an improved version thereof as described above.

[0023] The yarn clearer according to the present invention is excellent in terms of high certainty during the implementation of the cutting process, and can particularly effectively avoid failures based on contamination of the yarn clearer in the area of the cutting mechanism.

[0024] An embodiment of the present invention will be described below with reference to the drawings.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view showing an exploded view of an embodiment of a cutting device that can be arranged inside a housing body. [Figure 2] It is a perspective view showing a housing cover that can be arranged on a flat housing body for accommodating a cutting means driving device and a cutting means support of the cutting device in FIG. 1. [Figure 3] It is a perspective view showing a yarn clearer.

[0026] In FIG. 1, an embodiment of a cutting device 1 including a cutting means driving device 6, a driving element 21, and a cutting means support 5 is shown in a perspective view. A cutting knife 4 having a cutting edge 20 is arranged on the cutting means support 5.

[0027] The cutting means support 5 is movable by the cutting means driving device 6 from the rest position shown in FIG. 1 to a cutting position not shown here. At the cutting position, the cutting edge 20 engages with the contact surface 3 of the anvil 2 arranged on the anvil support 7, and separates the yarn (not shown here) located therebetween.

[0028] The anvil 2 is placed on the upper surface 19 of the fixed portion 18 of the anvil support 7 by the lower surface 17 and is screwed and fastened to the anvil support 7 via a fixing screw 9. This fixing screw 9 extends through a through hole 12 provided in the anvil 2 and into a threaded hole 8 provided in the fixed portion 18. According to an embodiment not shown, the fixing screw 9 may be screwed and fastened to a housing base not shown.

[0029] Figure 3 shows a perspective view of a thread clearer 10, which includes a housing body 14 formed from a housing cover 15 and a housing base 11. The housing base 11, a component of the thread clearer 10, provides a flat inner wall for forming the housing body 14, which is covered by the housing cover 15, thereby defining the housing chamber 16 with respect to the periphery of the thread clearer 10. The housing cover 15 is erected against the inner wall of the housing base by a housing cover edge 31 and a housing web 30, as shown in Figure 2. To form a cutting mechanism from a cutting device 1 and the housing body 14, the cutting device 1 is partially located within the housing body 14, and the cutting knife 4 in the cutting means support 5 protrudes from the housing body 14 toward the contact surface 3 of the anvil 2 in the illustrated resting position. When the thread clearer is in operation, a thread (not shown here) extends into the region between the contact surface 3 of the anvil 2 and the cutting edge 20 of the cutting knife 4. When thread cutting is to be performed, the cutting knife 4 is moved from the resting position shown in the figure to the cutting position, where the cutting edge 20 is in contact with the contact surface 3 of the anvil 2, cutting the threads located between them.

[0030] The cutting means drive unit 6 of the cutting device 1 is located within the housing chamber 16 of the housing cover 15. The cutting means drive unit 6 is coupled to the cutting means support 5 via a drive element 21, and the cutting means support 5 is movable between a resting position and a cutting position within the support portion 27 of the housing cover. Since the drive element 21 protrudes through the first housing opening 23 of the housing cover 15, when the cutting means drive unit 6 is operated, the cutting means support 5 is moved between a resting position and a cutting position within the support portion 27, and the cutting means support 5 is moved to the cutting position within the second housing opening 24, where the cutting edge 20 of the cutting knife 4 is spaced away from the outer wall of the housing cover 15 and in contact with the contact surface 3 of the anvil 2.

[0031] The second housing opening 24 and the first housing opening 23 of the housing cover 15, which are positioned sequentially in the direction of movement, are formed so as to contact the drive element 21 and the cutting means support 5 with their annular opening edges 26, thereby preventing any floating fibers that may be present in the area in front of the second housing opening 24 from reaching the support portion 27.

[0032] The support portion 27 further has a wall portion 25 positioned spaced apart from the upper surface 29 of the cutting means support 5, thereby forming an expanded region 28 into which any airborne fibers that may have entered are collected based on the resulting pressure difference and are no longer guided toward the first housing opening 23.

[0033] The cutting means support 5 has a web-shaped projection 13 which extends across the entire width of the enlarged area 28 (when viewed laterally with respect to the direction of movement) and enters the enlarged area 28. This allows the projection 13 to move or push out any floating fibers placed within the enlarged area 28 outward from the second housing opening 24 when the cutting means support 5 moves from the resting position to the cutting position.

[0034] On the underside of the housing, the housing cover 15 has a ventilation opening 22, through which the housing interior chamber 16 is technically connected to the surrounding airflow. This allows air to flow from around the housing cover 15 into the housing interior chamber 16 when the drive element 21 moves from the resting position to the cutting position, preventing the formation of negative pressure.

[0035] The anvil support 7 protrudes beyond the housing body 14 and, by the anvil 2, forms a contact surface 3 that is positioned opposite the cutting edge 20 of the cutting knife 4, and the thread is guided between the housing cover 15 and the anvil 2 when the thread clearer 10 is in operation. [Explanation of symbols]

[0036] 1 cutting device 2 Anvils 3 Contact surface 4 Cutting knives 5 Cutting means support 6. Cutting means drive device 7 Anvil Support 8 threaded holes 9 Fixing screws 10 Thread Clear 11 Housing base 12 Through holes 13 Protrusion 14 Housing Body 15 Housing Cover 16 Housing Interior 17 Bottom side 18 Fixed part 19 Top side 20 Cutting Edges 21 Drive element 22 Ventilation openings 23 First housing opening 24 Second housing opening 25 Wall section 26 Opening edge 27 Support part 28. Expanded Area 29 Top side 30 Housing Web 31 Housing cover edge

Claims

1. A cutting mechanism for a yarn clearer (10) that can be arranged in an operating unit of a textile machine, comprising: a housing base (11), a housing cover (15) at least partially covering said housing base (11) and defining together with said housing base (11) a housing interior (16); a first housing opening (23) connected to said housing interior (16); a housing body (14) having a cutting means support (5) with a cutting knife (4), a cutting means drive (6) arranged in the housing interior (16) for moving the cutting means support (5) between a cutting position remote from the housing and a rest position adjacent to the housing; a drive element (21) arranged movably in said first housing opening (23) which connects said cutting means drive (6) and said cutting means support (5); A cutting device (1) comprising: A cutting mechanism comprising: The housing body (14) a support part (27) for movably accommodating said cutting means support (5); a second housing opening (24) adjacent to said support part (27), extending perpendicular to the direction of movement of said cutting means support (5) and having an opening edge (26) in contact with said cutting means support (5); A cutting mechanism comprising:

2. 2. The cutting mechanism according to claim 1, wherein the housing body (14) is formed in such a way that in the region of the second housing opening (24) an end face of the cutting means support (5) is arranged flush with the end face of the cutting means support (5) in the rest position.

3. 3. The cutting mechanism according to claim 1, wherein the first housing opening (23) is in contact with the drive element (21) with an opening edge (26) extending perpendicular to the direction of movement of the drive element (21).

4. 3. A cutting mechanism according to claim 1 or 2, characterized in that the support portion (27) has at least one wall portion (25) arranged spaced apart from the cutting means support (5) to form an enlarged area (28).

5. 5. A cutting mechanism according to claim 4, characterized in that the cutting means support (5) has a protrusion (13) which penetrates into the enlarged area (28) and is movable in the enlarged area (28) between the rest position and the cutting position.

6. 3. The cutting mechanism according to claim 1, wherein the housing body (14) has a ventilation opening (22) arranged on the underside of the housing body (14) for ventilating the housing interior (16).

7. 3. The cutting mechanism according to claim 1 or 2, characterized in that the inner wall of the support part (27) and / or the outer surface of the cutting means support (5) and / or the outer surface of the drive element (21) have a polished surface.

8. 3. The cutting mechanism according to claim 1, wherein the housing base (11) has a flat inner wall of the housing base, and the housing cover (15) has a housing cover edge (31) annularly provided on the inner wall of the housing base, and a housing cover base continuing from the housing cover edge (31).

9. 9. The cutting mechanism according to claim 8, wherein the housing cover (15) has a housing cover web (30) that projects from the housing cover base toward the housing base (11) and stands on the inner wall of the housing base to form the support portion (27).

10. A yarn clearer for a working unit of a textile machine, comprising a cutting mechanism for completely removing defects from the yarn, 3. A yarn clearer, characterized in that the cutting mechanism is formed according to claim 1 or 2.

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