Top apron holder of apron draft device of fiber machine
Patent Information
- Application Number
- JP2022093530
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2021-06-10
- Filing Date
- 2022-06-09
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2042-06-09
AI Technical Summary
Existing apron drafting devices in textile machines face challenges in adjusting apron length tolerances, which affect the uniformity and precision of yarn production, due to the limitations of conventional tensioning devices that prevent accurate spacing adjustment.
A top apron holder with a replaceable tensioning element and deflection section, allowing for adjustable tension and spacing between the apron and guide elements, enabling precise compensation of apron length tolerances and ensuring uniform yarn quality.
The solution allows for quick and variable adjustment of apron tension and spacing, enhancing the precision and uniformity of yarn production by compensating for length tolerances and reducing operational issues.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present invention relates to a top apron holder for an apron drafting device of a textile machine, in particular of a roving frame, such as a flyer, and of a spinning machine, such as a ring frame or an air frame, comprising: -An apron guide unit for circulatingly guiding a top apron wound around a top roller of an apron drafting device, the apron guide unit comprising an apron guide section for guiding the top apron, the apron guide section comprising: an entrance section for receiving and guiding the top apron; a deflection section spaced apart from the entrance section for deflecting the guided top apron; an apron guide unit having a top roller support unit for supporting the top apron holder and for positioning the downstream apron guide unit relative to the top roller in the circulation direction of the top apron; The present invention relates to a top apron holder comprising:
[0002] Drafting devices are known in various configurations from the prior art. They serve to draw or draft the sliver, thereby reducing the cross section of the sliver. To achieve a uniform sliver, which is a prerequisite for producing uniform yarn, the fibers must be transported as evenly as possible alongside one another during drafting.
[0003] To draw the sliver, a drafting device typically has several roller pairs arranged one behind the other. The rollers of each pair are arranged in contact with each other and sandwich and transport the sliver running between them. Each roller pair typically consists of a bottom roller and an upper pressure roller that contacts the bottom roller. One of these rollers is driven, while the other roller is rotated by pressing. Drafting of the sliver is achieved by increasing the peripheral speed from one roller pair to the next in the transport direction of the sliver, which is determined by the direction of rotation of the roller pairs. In this case, the different peripheral speeds of immediately successive roller pairs in the transport direction determine the draft ratio.
[0004] The lower rollers are each arranged on a carrier device, in particular a drafting device carriage, which are arranged one after the other in the sliver conveying direction and form the lower drafting device part of the drafting device. Because the fibers of the sliver lose their cohesion in the main drafting zone where the sliver is drafted at high draft values, it is known to form the drafting device as an apron drafting device. In apron drafting devices, the sliver is guided by an apron between the gripping lines of immediately successive roller pairs. In particular, apron drafting devices in which an apron is guided around each of the top and bottom rollers in the area of the main drafting zone are common. The apron is deflected in the return direction by an apron guide device toward the outlet roller pair so that the sliver can be guided between the top and bottom aprons.
[0005] The apron, which is usually configured as an endless belt, is further guided around a tensioning device that holds the apron with the preload required for operation. Known tensioning devices are usually oriented axially with respect to the running direction, which affects the depth of the guided apron in the running direction, which prevents accurate spacing adjustment. If a device for adjusting the apron tension is omitted, extremely small tolerances in the apron length are required to ensure orderly operation.
[0006] Starting from this, the problem underlying the present invention is to provide a top apron holder for an apron drafting device, and an apron drafting device including such a top apron holder, which can quickly and variably compensate for apron length tolerances in a simple manner.
[0007] The invention solves this problem by a top apron holder having the features of claim 1 and by an apron drafting device having the features of claim 9. Advantageous refinements of the invention are set forth in the dependent claims.
[0008] The present invention is characterized in that the apron guide unit has a receiving portion, which is arranged in correspondence with the inlet section, for a replaceable tensioning element that can be pressed against the inner surface of the top apron and the tensioning element. The receiving portion can preferably be formed integrally with the apron guide section in the region of the inlet section, or it can be formed as a separate component that can be connected to the inlet section, for example via a support unit, as will be explained in more detail below. The receiving portion and the tensioning element that is replaceably received in the receiving portion are formed at a distance from the region of the apron guide section enclosed by the tensioning element and the deflection section, for guiding the top apron via the tensioning element and the deflection section. In other words, in the operating state of the top apron holder, the top apron is guided by the tensioning element, with a gap formed between the tensioning element and the deflection section and between the inner surface of the top apron and the facing surface side of the apron guide section. The guide plane formed by the tensioning element and the deflection section, which corresponds to the inner surface section of the top apron to be fed, extends at a distance from the surface section of the apron guide section that is surrounded by the tensioning element and the deflection section in the guide direction or along the guide plane. The tensioning elements, which are able to generate a uniform tension depending on their configuration based on their arrangement in the top apron during operation, allow for individual adjustment of the apron tension depending on their configuration. Tolerances in the apron length can be compensated for via the dimensions of the tensioning elements, allowing the apron tension to be adjusted with high precision.
[0009] According to a preferred embodiment of the present invention, the apron guide section has, at its end forming the deflection section, a separate receiving section configured for receiving a replaceable deflection element for deflecting the circularly guided top apron, as well as a deflection element. This allows for simple support of the top apron's protruding guide toward the front side of the apron guide section. Therefore, the deflection section or deflection element with the separate receiving section is configured for a defined guide of the top apron. In particular, the use of a deflection element configured separately from the apron guide section further enables precise adjustment of the apron's distance from the downstream outlet roller pair, which is important for uniform yarn and splice quality. The use of the deflection element allows the distance to be reproducibly and precisely adjusted. Furthermore, depending on its configuration, the deflection element can form an additional tensioning element, which can facilitate and assist in the adjustment of the apron tension with high precision.
[0010] The design of the tensioning element and its arrangement on the top apron holder in the area of the inlet section of the apron guide section, as well as the design of the deflection element and its arrangement on the top apron holder in the area of the deflection section of the apron guide section, are fundamentally freely selectable.However, a particularly advantageous configuration of the invention provides that the receiving area and / or the further receiving area is formed by two guide means arranged at a distance from one another for guiding the top apron laterally, and that the tensioning element or deflection element is formed as a guide rod arranged in the area between the guide means, which guide rod extends in the direction of its longitudinal axis towards the guide means into the receiving area or the further receiving area, and that both guide means are arranged in particular on the side edges of the apron guide section, in particular formed integrally therewith.
[0011] The orientation of the guide rods relative to the guide means, which extends transversely to the direction of rotation of the top apron, thereby ensures uniform tensioning of the top apron by the guide rods, and the orientation of the guide rods relative to the guide means which laterally guide the top apron, ensures that the guide rods do not exert forces on the top apron acting transversely to the direction of rotation of the top apron. In particular, this transverse orientation effectively prevents twisting of the top apron at the contact points with the guide rods. Particularly preferably, the tensioning element or deflection element is accommodated in the respective receiving part or in a further receiving part perpendicular to the direction of rotation of the top apron, so that the tensioning element and its receiving part or the deflection element and its further receiving part are subjected to a pressure directed exclusively in the guide direction.
[0012] The arrangement of the tensioning or deflecting elements, in particular as individually or separately configured guide rods, can basically be carried out in any manner, thus offering, for example, the possibility of detachably arranging the tensioning or deflecting elements in a fixed manner on the top apron holder, so that depending on the tension to be adjusted on the top apron and / or the distance to be adjusted for the deflecting elements relative to the outlet roller, differently designed guide rods with contact surfaces of different lengths can be used, thereby achieving an optimal positioning of the top belt.
[0013] According to a preferred embodiment of the invention, the tensioning element and / or deflection element has at least one retaining pin, and the receiving portion or another receiving portion is configured to receive the retaining pin for interchangeable reception of the tensioning element or deflection element, with the at least one retaining pin extending transversely to the guide web of the tensioning element or deflection element that guides the top apron. For example, in a preferred version with only one retaining pin, the tensioning element or deflection element forms a T-shape in cross section in a cutting plane that runs through and along the guide web and the retaining pin. In a particularly preferred version with two retaining pins, this cross-sectional shape transitions into a π-shape, which allows for greater stability than a T-shape cross-section.
[0014] According to one preferred refinement of the invention, a support unit is provided which is associated with the apron guide unit and which forms a receiving space for the tensioning element or a separate receiving space for the deflection element, on which the tensioning element or deflection element, in particular in the form of a guide rod, is removably arranged, and which support unit is supported on the top apron holder, in particular on the apron guide unit.
[0015] According to this embodiment of the invention, a support unit is arranged on the top apron holder, which is designed for a removable and therefore replaceable accommodation of a tensioning or deflection element. The use of the support unit ensures that the support unit can be adapted to the configuration of the tensioning or deflection element and that the tensioning or deflection element can be easily replaced in order to adjust the desired apron tension or the distance to the outlet roller. The support unit that accommodates the tensioning or deflection element is supported on the top apron holder in such a position that, in the operating state of the top apron holder, a secure application of the tensioning or deflection element to the inner surface of the top apron is ensured, while at the same time allowing for easy replacement of the tensioning or deflection element if necessary. Furthermore, the support unit is preferably arranged so that the accommodation or further accommodation is adjacent to a lateral guide means in the circulation or guide direction of the top apron.
[0016] According to a preferred embodiment of the invention, it is provided that the tensioning element in the receiving part and / or the deflection element in the other receiving part are supported or received in a preloaded, in particular spring preloaded, position in the direction opposite to the apron guide section, i.e., in the direction of the top apron. The preloaded attachment of the tensioning element or deflection element to the inner surface of the top apron ensures that the top apron can be preloaded particularly uniformly and that any vibrations that occur during operation can be compensated for by the preload, in particular the spring preload, thereby ensuring particularly trouble-free operation of the apron drafting device with the top apron holder.
[0017] It is particularly preferred that a spring unit is provided, which is arranged in correspondence with the receiving section and / or the further receiving section. The spring unit may even be arranged in the receiving section or the further receiving section. This spring unit allows the tensioning element or deflection element to be replaced as needed while maintaining the preload created by the spring unit, thereby enabling a quick adaptation to different top aprons in a simple and convenient manner. It is particularly preferred that the spring unit is configured to adjust the preload acting on the tensioning element or deflection element.
[0018] The possibility of adjusting the preload makes it possible in a particularly precise and convenient way to adapt the apron length and the apron tension to be achieved or the spacing to the downstream outlet roller without necessarily having to exchange tensioning or deflection elements for the desired adaptation.
[0019] Additionally or alternatively, a further preferred embodiment of the present invention provides that the receiving portion and / or the further receiving portion are configured for exchangeably receiving at least one adapter element, which can be connected to a tensioning element and / or a deflection element, so that in the connected and received state, the position of the tensioning element or deflection element relative to the apron surface section can be changed or adapted. This embodiment of the present invention allows the apron tension to be individually adjusted by using different adapter elements. Therefore, a selected apron tension can be set in a simple manner by exchanging differently configured adapter elements. For example, the adapter element can be slotted, so that it can be slipped onto the tensioning element or deflection element or onto a retaining pin associated with the tensioning element or deflection element and then easily removed again if necessary.
[0020] According to another aspect of the present invention, there is provided an apron drafting device for a textile machine such as a roving frame, in particular a flyer, or for a spinning machine, in particular a ring frame or air frame, the apron drafting device comprising a drivable first roller pair and a drivable second roller pair for drafting a sliver, the first roller pair and the second roller pair being arranged spaced apart from each other in the sliver transport direction so as to sandwich and transport the sliver between the upper and lower rollers of each roller pair, the first roller pair and the second roller pair being drivable at different rotational speeds in the operating state of the apron drafting device so as to form a draft zone located between the gripping lines of the first roller pair and the second roller pair, and a top apron holder being arranged between the first roller pair and the second roller pair, which circulates the top apron wrapped around the upper roller of the first roller pair along the sliver transport direction in the draft zone. The apron drafting device is characterized in that the top apron holder is configured according to one of the preferred embodiments described above.
[0021] An embodiment of the present invention will now be described with reference to the drawings. [Brief explanation of the drawings]
[0022] [Figure 1] FIG. [Figure 2a] 1A and 1B show a first embodiment of an adapter element. [Figure 2b] FIG. 10 shows a second embodiment of an adapter element. [Figure 2c] 10A and 10B show a third embodiment of an adapter element.
[0023] FIG. 1 shows a perspective view of a top apron holder 1 of an apron drafting device (not shown) according to one embodiment.
[0024] The top apron holder 1 has two top roller support units 2 spaced apart from each other, and these top roller support units 2 are coupled to a base carrier 9 of the apron guide unit 4.
[0025] The apron guide unit 4 has an apron guide section 11, which is laterally bounded by web-like guide means 5 that, in the operating state of the top apron holder 1, define the lateral travel path of an endless top apron (not shown). During operation, the top apron is guided towards the apron guide section 11 via the top rollers 3. To receive the top apron, the apron guide section 11 has an inlet section 11a and, spaced apart from the inlet section 11a, a deflection section 6. The deflection section 6 includes a rod-shaped deflection element 6a that guides the top apron around its periphery. The deflection element 6a is held exchangeably in a separate receptacle (not shown). The deflection element 6a is configured as a guide rod. Depending on the configuration of the deflection element 6a, the distance between the outlet roller pair (not shown) of the apron drafting device and the downstream top roller in the sliver transport direction can be variably adapted.
[0026] In order to generate the desired apron tension, a tensioning element 7 formed as a guide rod extends between the guide means 5 and is detachably connected to the guide means 5. During operation, the tensioning element 7 contacts the inner surface of the top apron and generates the apron tension via this contact surface. The tensioning element 7 is replaceably held in a receiving part 10, which in this preferred embodiment is formed by the guide means 5. Alternatively, in an embodiment not shown, the receiving part can be a component of a support unit assigned to the apron guide unit 4, on which the tensioning element 7 is detachably arranged and which is supported by the top apron holder 1. The receiving part can be arranged adjacent to or next to the guide means 5 in the guide direction.
[0027] The apron tension and the spacing relative to the outlet roller can be changed by arranging different adapter elements 8a, 8b, 8c (see FIGS. 2a-2c) in association with the tensioning element 7 or the deflection element 6a, each of which can be accommodated in the receiving portion 10 or in a separate receiving portion. When accommodated and connected to the tensioning element 7 or the deflection element 6a, the adapter elements 8a, 8b, 8c cause a change in the position of the tensioning element 7 or the deflection element 6a relative to the apron surface section 11, and thus, depending on the adapter element 8a, 8b, 8c or the configuration of the adapter element used, a corresponding change in the apron tension or the spacing relative to the outlet roller. The adapter elements 8a, 8b, 8c can be removably coupled to the tensioning element 7 and / or the deflection element 6a and can be easily pulled out of the tensioning element 7 and / or the deflection element 6a as needed. [Explanation of symbols]
[0028] 1 top apron holder 2 Top roller support unit 3 Top Roller 4 Apron guide unit 5 Guide means 6. Change of direction 6a Directional Elements 7 Tensioning element / guide rod 8a, 8b, 8c adapter elements 9 Base Carrier 10 Storage section 11 Apron Guide Division 11a Entrance section
Claims
1. A top apron holder (1) for an apron drafting device of a fiber machine, in particular a flyer, ring spinning machine or air spinning machine, - An apron guide unit (4) for circularly guiding a top apron wound around a top roller (3) of the apron drafting device, the apron guide unit (4) comprising an apron guide section (11) for guiding the top apron, and the apron guide section (11) being - An inlet section (11a) for receiving and guiding the top apron, - A deflection section (6) spaced from the inlet section (11a) for deflecting the guided top apron and having an apron guide unit (4), - A top roller support unit (2) for supporting the top apron holder (1) and positioning the apron guide unit (4) downstream of the top roller (3) in the circulation direction of the top apron In a top apron holder, The apron guide unit (4) has a receiving portion (10) arranged corresponding to the inlet section (11a) for a tensioning element (7) that can be pressed against the inner surface of the top apron and is replaceable, and the tensioning element (7). The receiving portion (10) and the tensioning element (7) replaceably received in the receiving portion (10) are spaced apart from a region of the apron guide section (11) surrounded by the tensioning element (7) and the deflection section (6) for guiding the top apron via the tensioning element (7) and the deflection section (6). A top apron holder (1), characterized in that.
2. The top apron holder (1) according to claim 1, wherein the apron guide section (11) has another receiving portion formed for receiving a replaceable deflection element (6a) for deflecting the top apron guided in a circular manner at an end forming the deflection section (6), and the deflection element (6a).
3. The receiving part (10) and / or the other receiving part are formed by two guide means (5) arranged at a distance from each other for guiding the top apron laterally, and the tensioning element (7) or the deflecting element (6a) is formed as a guide rod arranged in the region between the guide means (5), and the guide rod extends in the direction of its longitudinal axis into the receiving part (10) or the other receiving part in the direction towards the guide means (5), and both of the guide means (5) are arranged, in particular, at the side edges of the apron guide section (11), and are in particular integrally formed on the side edges. The top apron holder according to claim 2.
4. The tensioning element (7) and / or the deflecting element (6a) have at least one holding pin, and the receiving part (10) or the other receiving part is formed to receive the holding pin for exchangeable accommodation of the tensioning element (7) or the deflecting element (6a), and the at least one holding pin extends laterally with respect to the guide web of the tensioning element (7) or the deflecting element (6a) for guiding the top apron. The top apron holder (1) according to any one of claims 1 to 3.
5. The receiving part is a component of a support unit arranged corresponding to the apron guide unit (4), and the tensioning element (7) is detachably arranged on the support unit, and the support unit is supported by the top apron holder (1). The top apron holder (1) according to any one of claims 1 to 3.
6. The tensioning element (7) in the receiving part (10) and / or the deflecting element (6a) in the other receiving part (10) are preloaded in a direction opposite to the apron guide section (11), and are in particular supported by a spring preload. The top apron holder (1) according to any one of claims 1 to 3.
7. A spring unit is correspondingly arranged in the accommodating part (10) and / or the other accommodating part, and the spring unit is configured to adjust a preload acting on the tensioning element (7) or the deflecting element (6a). The top apron holder (1) according to claim 6.
8. The accommodating part (10) and / or the other accommodating part is formed to removably accommodate at least one adapter element (8a, 8b, 8c), and the at least one adapter element (8a, 8b, 8c) can be connected to the tensioning element (7) and / or the deflecting element (6a). Thereby, in the connected or accommodated state, the position of the tensioning element (7) or the deflecting element (6a) with respect to the apron surface section (11) can be changed. The top apron holder (1) according to any one of claims 1 to 3.
9. An apron drafting device for a fiber machine, particularly a flyer, ring spinning machine or air spinning machine, - A first drivable roller pair and a second drivable roller pair for drafting a sliver, wherein the first roller pair and the second roller pair are spaced apart from each other in the sliver conveying direction to sandwich and convey the sliver between the upper roller and the lower roller of each roller pair, and the first roller pair and the second roller pair are drivable at different rotational speeds in the operating state of the apron drafting device to form a drafting zone located between the gripping lines of the first roller pair and the second roller pair. A first roller pair and a second roller pair, - A top apron holder (1) arranged between the first roller pair and the second roller pair, and guiding the top apron wound around the top roller (3) of the first roller pair in a circulating manner along the sliver conveying direction in the drafting zone, An apron drafting device comprising The apron draft device, characterized in that the top apron holder is the top apron holder (1) according to any one of claims 1 to 3.