Yarn cleaner and cutting device for a yarn cleaner
Patent Information
- Authority / Receiving Office
- PT · PT
- Patent Type
- Patents
- Current Assignee / Owner
- SAURER INTELLIGENT TECH AG
- Filing Date
- 2021-11-04
- Publication Date
- 2026-06-15
AI Technical Summary
Existing cutting devices in yarn cleaners are prone to increased friction and unreliable cutting performance due to loose fibers accumulating in the housing area, leading to incorrect cutting processes.
The cutting device features a housing body with a storage section and two housing openings, where the second opening is designed to prevent loose fibers from entering the interior, and a ventilation opening to counteract negative pressure, ensuring the cutting medium carrier can move between rest and cutting positions without fiber contamination.
This design ensures reliable yarn separation by preventing fiber accumulation and reducing friction, resulting in consistent and accurate cutting performance.
Abstract
Description
[0001] The invention relates to a cutting device for a yarn cleaner that can be arranged at a workstation of a textile machine, with comprising a housing body, a housing base body, a housing cover which at least partially covers the housing base body and together with the housing base body defines an interior housing space, a first housing opening, and a cutting device with a cutting medium carrier having a cutting blade, a cutting medium drive arranged in the interior housing space for adjusting the cutting medium carrier between a cutting position far from the housing and a rest position close to the housing, and a drive element adjustable in the first housing opening connecting the cutting medium drive and the cutting medium carrier.
[0002] In yarn production, the goal is typically to achieve the highest possible uniformity of the finished yarn within tight tolerances, as well as a yarn free of visible defects such as unacceptable thick or thin spots. To achieve this, so-called yarn cleaners are used at the individual workstations of a textile machine. These cleaners continuously monitor the yarn diameter using a suitable measuring head. If an unacceptable defect is detected due to exceeding or falling below the limit values known as cleaning limits, the defect is cut out of the yarn using the cutting device located in the yarn cleaner's housing. The yarn ends are then rejoined, and the production process continues.
[0003] Known cutting devices for yarn cleaners, for example, have an electromagnetically actuated cutting element drive, wherein a cutting element carrier, on which a cutting knife is arranged, is adjusted between a rest position and a cutting position by means of the cutting element drive in the manner of a chisel, whereby a yarn arranged between the cutting element carrier and an anvil is cut in the cutting position.
[0004] In known cutting devices, the cutting device is arranged inside a housing body and connected via a drive element, which extends through a first housing opening, to the cutting medium carrier arranged outside the housing interior, so that the cutting medium carrier can be adjusted to engage with the yarn via the drive element by means of the cutting medium drive.
[0005] The cutting device is preferably arranged on the housing body such that, in the installed position of the yarn cleaner, the cutting device is preferably located – with respect to the yarn direction – at the front end of the housing body, thus ensuring that, due to the rotational inertia of a spool receiving the yarn, a thread guide area of the yarn cleaner is thread-free after cutting. However, an arrangement of the cutting device – with respect to the yarn direction – in the inlet area of the housing body has the disadvantage that this area is inherently burdened with a higher concentration of loose fibers.Despite the cutting device being enclosed in the housing body, this fiber load can cause fibers to accumulate in the area of the first housing opening and from there enter the housing interior, where they lead to increased friction in the area of the cutting device, resulting in reduced cutting force and consequently faulty cutting processes.
[0006] Based on this, the invention aims to provide a yarn cleaner with a cutting device and a cutting device that ensures reliable separation of the yarn when required.
[0007] The invention solves the problem by means of a cutting device with the features of claim 1 and by means of a yarn cleaner with the features of claim 10. Advantageous further developments of the cutting device are specified in dependent claims 2 to 9.
[0008] A characteristic feature of the cutting device according to the invention is that the housing body a bearing section for the adjustable mounting of the cutting medium carrier and a second housing opening adjacent to the bearing section with an opening edge running perpendicular to the adjustment direction of the cutting medium carrier and abutting the cutting medium carrier exhibits.
[0009] The housing body of the cutting device according to the 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 an interior housing space within which a cutting element drive of a cutting device is arranged. To adjust a cutting element carrier arranged outside the interior housing space, which is designed with a cutting blade having a cutting edge, the housing body has a first housing opening which is connected to the interior housing space and through which a drive element extends, connecting the cutting element drive to the cutting element carrier, so that the cutting element carrier can be adjusted between a rest position and a cutting position by means of the cutting element drive, the drive element being adjustably arranged in the first housing opening for this purpose.
[0010] According to the invention, it is further provided that the housing body, in the area in front of the first housing opening, i.e., outside the housing interior, has a bearing section for the adjustable reception of the cutting element carrier, and that the bearing section has a second housing opening opposite one of the first housing openings in the adjustment direction of the cutting element carrier between the rest position and the cutting position. The second housing opening is designed such that its opening edge, which runs coaxially to the adjustment direction of the cutting element carrier, abuts the cutting element carrier, while ensuring an adjustment movement of the cutting element carrier relative to the housing body between the cutting position and the rest position.
[0011] The inventive design of the cutting device with a housing body that also encloses the cutting medium carrier in the area of the bearing section, wherein the second housing opening enables the cutting medium carrier to be moved from a rest position close to the housing to a cutting position farther from the housing, in which a cutting blade on the cutting medium carrier interacts with a stop and thereby cuts through a yarn located in between, reliably ensures that no loose fibers enter the interior of the housing and cause increased friction there, which could lead to unreliable cutting performance.
[0012] According to an advantageous embodiment of the invention, the housing body is designed in the area of the second housing opening to allow for the flush arrangement of an end face of the cutting element carrier in the rest position. In this embodiment, the preferably flat end face of the cutting element carrier, on which the cutting blade is arranged, lies in the same plane as the surface of the housing body surrounding the second housing opening in the rest position. To perform a cutting operation, the cutting element carrier is moved relative to the housing body from the flush arrangement to the cutting position, in which the end face projects at least partially from the housing body or, in an alternatively preferred embodiment, is spaced apart from it.The flush-mounted design of the end face in the rest position ensures with exceptional reliability that unwanted deposits of free fibers do not accumulate on the housing body in the area of the cutting tool carrier. These deposits could otherwise be transported towards the interior of the housing if the cutting tool carrier is moved, particularly when returning from the cutting position to the rest position. Furthermore, the flush-mounted design in the rest position reliably prevents the accumulation of free fibers in the area of the second housing opening, as it eliminates edges that could promote fiber accumulation.
[0013] According to a further embodiment of the invention, the first housing opening is designed to abut the drive element with an opening edge that runs perpendicular to the adjustment direction of the drive element. This embodiment of the invention, in which the opening edge of the first housing opening, in addition to guiding the drive element within the housing body, also provides a sealing effect, additionally ensures that any free fibers that may have entered the bearing section via the second housing opening are not transported further into the housing interior, where the cutting element drive, which drives the cutting element carrier via the drive element, is located. Contamination of the housing interior is further prevented by the advantageous design of the first housing opening.
[0014] The design of the bearing section in the area between the first and second housing openings, in which the cutting element carrier is adjustably arranged between the rest position and the cutting position, is fundamentally freely selectable. According to a particularly advantageous embodiment of the invention, the bearing section, delimited by the housing cover and housing base, has at least one wall section spaced apart from the cutting element carrier to form an expansion area.
[0015] According to this embodiment of the invention, it is provided that the bearing section does not rest against the cutting medium carrier all the way around, but that at least one of the wall sections provided by the housing base body and housing cover - viewed transversely to the adjustment direction of the cutting medium carrier between the rest position and the cutting position - is arranged at a distance from the cutting medium carrier.The expansion zone thus represents a free area between the first and second housing openings, which has a larger free cross-section than the free area of the second housing opening. This means that, under certain circumstances, free fibers penetrating the storage section through the first housing opening may not reach the second housing opening due to the expanding housing section and the resulting pressure difference, despite a suction effect occurring in the area of the second housing opening when the cutting tool carrier returns from the cutting position to the rest position. The expansion zone, due to its larger cross-section, also reduces any potentially existing negative pressure.
[0016] According to a further embodiment of the invention, the cutting element carrier has a projection extending into the expansion area and adjustable within this area between the rest position and the cutting position. According to this embodiment of the invention, the cutting element carrier has a projection, e.g.in the form of a bridge, which extends across the width of the expansion area - viewed transversely to the adjustment direction of the cutting element carrier - into it up to the wall section arranged at a distance from the cutting element carrier, so that when the cutting element carrier is adjusted from the rest position to the cutting position, the projection conveys any free fibers that may have entered the expansion area of the bearing section during the previous adjustment from the cutting position to the rest position out of the bearing section and beyond the second housing opening, so that impairment of the cutting device by deposited fibers can be prevented in a particularly reliable manner.
[0017] According to a further embodiment of the invention, the housing body has a ventilation opening that ventilates the interior of the housing. This ventilation opening is preferably located on a side of the housing body that differs from the first housing opening, and particularly preferably on an underside of the housing body or on a side of the housing body opposite the first housing opening. According to this embodiment of the invention, the housing body has a ventilation opening at any desired location, but preferably on a side of the housing body defined above – with respect to the installation position of the cutting device – i.e., on a side of the housing body oriented against the direction of thread travel. This ventilation opening connects the surroundings of the housing body with the interior of the housing.
[0018] When the cutting tool carrier is moved from its rest position to the cutting position, during which the drive element is displaced from the housing interior towards the first and second housing openings, creating a negative pressure inside the housing, ambient air can flow in through the ventilation opening. This prevents the formation of negative pressure inside the housing, which would otherwise encourage fibers to penetrate the storage section and / or the housing interior in the area of the first and second housing openings. Furthermore, it is also possible to actively ventilate the housing interior via the ventilation opening, creating positive pressure which further counteracts the ingress of free fibers.
[0019] According to a further embodiment of the invention, the inner walls of the bearing section and / or the outer surfaces of the cutting element carrier and / or the outer surfaces of the drive element have a polished surface. A polished surface is defined as having a mean roughness value (Ra) of the surfaces in the range of 0.01 to 0.2. This surface finish additionally prevents free fibers from adhering to the individual surfaces and, in the event of adjustment of the cutting element carrier, from entering the bearing section and / or the interior of the housing. The polished surfaces facilitate the sliding of the free fibers.
[0020] The design of the housing base and the housing cover to form the housing body is generally freely selectable. For example, the housing base and the housing cover can each be designed as semi-shell-shaped bodies, which together define the housing interior and the bearing section. However, according to an advantageous embodiment of the invention, the housing base has a flat inner wall, and the housing cover has a circumferential rim that extends onto the inner wall of the housing base and a housing cover body adjoining the rim.
[0021] According to this embodiment of the invention, the housing body provides a substantially flat inner wall on which the semi-shell-shaped housing cover rests with a circumferential rim, such that the housing cover opposite the inner wall is spaced apart from the flat surface of the housing body. This embodiment of the invention represents a particularly simple method for manufacturing the housing body, whereby the inner wall can be provided by further housing bodies of the yarn cleaner. Furthermore, this embodiment of the invention offers the possibility of providing the bearing section provided according to the invention, as well as other advantageous embodiments of the housing body, solely through a corresponding design of the housing cover.According to a particularly advantageous further development of the invention, the housing cover has housing cover webs projecting from the housing cover base body towards the housing base body and resting on the flat inner wall of the housing base body to form the bearing section.
[0022] The invention further solves the problem by means of a yarn cleaner for a work station of a textile machine with a cutting device for cleaning out defects from a yarn, which has a cutting device as described above according to the invention or further developed.
[0023] A yarn cleaner according to the invention is characterized by its high reliability in carrying out the cutting processes, whereby malfunctions due to contamination of the yarn cleaner in the area of the cutting device can be avoided particularly effectively.
[0024] An embodiment of the invention is explained below with reference to the drawings. The drawings show: Fig. 1 shows an exploded view of a perspective view of an embodiment of a cutting device that can be arranged in a housing body; Fig. 2 shows a perspective view of a housing cover that can be arranged on a flat housing body to accommodate a cutting drive and a cutting carrier of the cutting device. Fig. 1 and Fig. 3 a perspective view of a yarn cleaner.
[0025] Figure 1 Figure 1 shows a perspective view of an embodiment of a cutting device 1 with a cutting medium drive 6, a drive element 21 and a cutting medium carrier 5, on which a cutting knife 4 having a cutting edge 20 is arranged.
[0026] The cutting medium carrier 5 is removed from the in by means of the cutting medium drive 6. Figure 1The rest position shown can be adjusted to a cutting position not shown here, in which the cutting edge 20 engages with a stop surface 3 of an anvil 2 arranged on an anvil carrier 7 and cuts through a yarn located in between, which is not shown here.
[0027] The anvil 2 rests with its underside 17 on a top side 19 of a mounting section 18 of the anvil support 7 and is screwed to it by a fastening screw 9, which extends through a through-hole 12 in the anvil 2 into a threaded hole 8 in the mounting section 18. According to an embodiment not shown, the fastening screw 9 can be screwed into a housing base not shown.
[0028] Figure 3Figure 1 shows a perspective view of a yarn cleaner 10 with a housing body 14 formed from a housing cover 15 and a housing base 11. The housing base 11, which is part of the yarn cleaner 10, provides a flat inner wall for the formation of the housing body 14. This inner wall is covered by the housing cover 15 and thus delineates an interior space 16 from the surroundings of the yarn cleaner 10. The housing cover 15 is positioned as shown in Figure 1. Figure 2The device is shown with a housing cover rim 31 and housing webs 30 on the inner wall of the housing base. To form the cutting device, consisting of the cutting device 1 and the housing body 14, the cutting device 1 is arranged sectionally within the housing body 14, with the cutting blade 4 projecting from the housing body 14 towards the stop surface 3 of the anvil 2 in the rest position shown, on the cutting element carrier 5. During operation of the yarn cleaner, a yarn (not shown) runs in the area between the stop surface 3 of the anvil 2 and the cutting edge 20 of the cutting blade 4. In the event of a yarn cut, the cutting blade 4 is moved from the rest position shown into the cutting position, in which the cutting edge 20 rests against the stop surface 3 of the anvil 2 and cuts the yarn located between them.
[0029] The cutting drive 6 of the cutting device 1 is arranged within the housing interior 16 of the housing cover 15. The cutting drive 6 is connected via the drive element 21 to the cutting carrier 5, which is adjustable within a bearing section 27 of the housing cover between the rest position and the cutting position. The drive element 21 projects through a first housing opening 23 of the housing cover 15, so that when the cutting drive 6 is activated, the cutting carrier 5 is moved within the bearing section 27 between the rest position and the cutting position, whereby the cutting carrier 5 is moved within a second housing opening 24 to the cutting position in which the cutting edge 20 of the cutting knife 4 rests against the stop surface 3 of the anvil 2, spaced apart from the outer wall of the housing cover 15.
[0030] The second housing opening 24 and the first housing opening 23 of the housing cover 15, arranged one behind the other in the adjustment direction, are designed so that they abut the drive element 21 and the cutting medium carrier 5 with a circumferential opening edge 26, so that any free fibers that may be present in the area in front of the second housing opening 24 do not enter the storage section 27.
[0031] The storage section 27 further comprises a wall section 25 spaced apart from a top surface 29 of the cutting medium carrier 5, thereby forming an expansion area 28 in which any free fibers that may penetrate are collected due to the existing pressure difference and are not directed towards the first housing opening 23.
[0032] The cutting medium carrier 5 has a rib-like projection 13 which extends across the width of the expansion area 28 - viewed transversely to the adjustment direction - and projects into it, so that any free fibers arranged in the expansion area 28 can be moved or pushed out of the second housing opening 24 by the projection 13 when the cutting medium carrier 5 is adjusted from the rest position to the cutting position.
[0033] On one underside of the housing, the housing cover 15 has a ventilation opening 22 through which the housing interior 16 is fluidically connected to the environment, so that when the drive element 21 is moved from the rest position to the cutting position, air from the environment of the housing cover 15 can flow into the housing interior 16 and counteracts the formation of negative pressure.
[0034] The anvil carrier 7 protrudes from the housing body 14 and forms a stop surface 3 opposite the cutting edge 20 of the cutting knife 4 with the anvil 2, whereby in operation of the yarn cleaner 10 the yarn is guided between the housing cover 15 and the anvil 2. Reference symbol list 1 Cutting device 17 bottom 2 anvil 18 Fastening section 3 Stop surface 19 Top 4 Cutting blade 20 Cutting edge 5 Cutting tool carrier 21 drive element 6 Cutting drive 22 ventilation opening 7 Anvil carrier 23 first case opening 8 Threaded hole 24 second case opening 9 fastening screw 25 Wall section 10 Yarn cleaner 26 Opening edge 11 Housing base 27 Storage section 12 through hole 28 Expansion area 13 projection 29 Top 14 Housing body 30 Case bridge 15 Housing cover 31 Case cover edge 16 Interior of the casing
Claims
1. Cutting device for a yarn cleaner (10) to be arranged at a work station of a textile machine, comprising: - a housing body (14), - a housing base body (11), - a housing cover (15) which at least partially covers the housing base body (11) and together with the housing base body (11) defines a housing interior (16), and - a first housing opening (23) connected to the housing interior (16), and - a cutting device (1) comprising: - a cutting medium carrier (5) having a cutting blade (4), - a cutting medium drive (6) arranged in the housing interior (16) for adjusting the cutting medium carrier (5) between a cutting position far from the housing and a rest position close to the housing, and - a drive element (21) arranged adjustably in the first housing opening (23) connecting the cutting medium drive (6) and the cutting medium carrier (5). characterized by the fact thatthe housing body (14) has a bearing section (27) for adjustable reception of the cutting medium carrier (5) and a second housing opening (24) adjacent to the bearing section (27) with an opening edge (26) extending perpendicular to the adjustment direction of the cutting medium carrier (5) and abutting the cutting medium carrier (5).
2. Cutting device according to claim 1, characterized by the fact that the housing body (14) in the area of the second housing opening (24) is designed for flush arrangement of an end face of the cutting medium carrier (5) in the rest position.
3. Cutting device according to claim 1 or 2, characterized by the fact that the first housing opening (23) with an opening edge (26) running perpendicular to the adjustment direction of the drive element (21) is in contact with the drive element (21).
4. Cutting device according to one or more of the preceding claims, characterized by the fact thatthe storage section (27) for the formation of an expansion area (28) has at least one wall section (25) arranged at a distance from the cutting medium carrier (5).
5. Cutting device according to claim 4, characterized by the fact that the cutting medium carrier (5) has a projection (13) extending into the expansion area (28) and adjustable in this area between the rest position and the cutting position.
6. Cutting device according to one or more of the preceding claims, characterized by the fact that the housing body (14) has a ventilation opening (22) that ventilates the interior of the housing (16), which is preferably arranged on a bottom side of the housing body (14).
7. Cutting device according to one or more of the preceding claims, characterized by the fact that the inner walls of the bearing section (27) and / or the outer surfaces of the cutting element carrier (5) and / or the outer surfaces of the drive element (21) have a polished surface.
8. Cutting device according to one or more of the preceding claims, characterized by the fact that the housing base body (11) has a flat housing base inner wall and the housing cover (15) has a housing cover rim (31) extending around the entire length of the housing base inner wall and a housing cover base body adjoining the housing cover rim (31).
9. Cutting device according to claim 8, characterized by the fact that The housing cover (15) has housing cover webs (30) projecting from the housing cover base body towards the housing base body (11) and resting on the inner wall of the housing base body to form the bearing section (27).
10. Yarn cleaner for a workstation of a textile machine with a cutting device for cleaning defects out of a yarn, characterized by the fact that the cutting device is designed according to one or more of claims 1 to 9.