Top apron holder for textile machinery apron drafting device

Abstract

To provide a top apron holder for an apron draft device, capable of compensating an apron length allowance in a rapid and adjustable manner by a simple style, and an apron draft device.SOLUTION: There is provided a top apron holder 1 for an apron draft device in which an apron guide unit 4 for circulation type guide of a top apron includes an apron guide segment 11; the apron guide segment has an entry segment 11a for accommodation and guide of the top apron and a turning segment 6 apart from the entry segment for turning the top apron; the apron guide unit has an accommodation part 10 arranged correspondingly to the entry segment and a tensioning element 7; and the accommodation part and the tensioning element are formed apart from a region of the apron guide segment surrounded with the tensioning element and the turning segment to guide the top apron via the tensioning element and the turning segment.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a top apron holder for an apron draft device of a textile machine, in particular a roving frame such as a flyer and a spinning machine such as a ring spinning machine or an air spinning machine, - an apron guide unit for circularly guiding a top apron wound around a top roller of an apron draft device, comprising an apron guide section for guiding the top apron, wherein the apron guide section: - an inlet section for receiving and guiding the top apron, - a deflecting section spaced apart from the inlet section for deflecting the guided top apron, and an apron guide unit comprising - a top roller support unit for supporting the top apron holder and positioning the apron guide unit downstream of the top roller in the circulation direction of the top apron, and a top apron holder comprising

[0002] Draft devices are known in various configurations from the prior art. A draft device serves to draw or draft a sliver, thereby causing a reduction in the cross-section of the sliver. In order to achieve a uniform sliver, which is a prerequisite for producing a uniform yarn, the fibers must be conveyed as evenly side by side as possible during drafting.

[0003] To extend a sliver, a drafting device typically has several pairs of rollers arranged in sequence. The rollers of each roller pair are in contact with each other, gripping and transporting the sliver as it travels between them. One roller pair usually consists of a bottom roller and an upper pressing roller that contacts this bottom roller. One of these rollers is driven, while the other is rotated by pressing against it. Drafting of the sliver is achieved by increasing the peripheral speed from roller pair to roller pair in the transport direction of the sliver, which is determined by the rotation direction of the roller pairs. In this case, the different peripheral speeds of the roller pairs that are directly consecutive in the transport direction determine the draft ratio.

[0004] The lower rollers are each positioned on a carrier device, particularly a drafting device carriage, which are arranged sequentially in the direction of sliver transport to form the lower drafting portion of the drafting device. Since the fibers of the sliver lose their binding properties in the main drafting zone where the sliver is drafted at a high draft value, it is known that the drafting device is configured as an apron drafting device. In an apron drafting device, the sliver is guided by an apron between gripping lines of directly continuous roller pairs. In particular, apron drafting devices are common in which one apron is guided around the top roller and one around the bottom roller in the area of ​​the main drafting zone. The apron is deflected in the return direction toward the exit roller pair by an apron guide device, so that the sliver can be guided between the top apron and the bottom apron.

[0005] Typically, the apron, formed 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 direction of travel, affecting the depth of the guided apron in the direction of travel, which hinders precise spacing adjustment. If a device to adjust the tension of the apron is omitted, extremely small tolerances in the apron length are required to ensure orderly operation.

[0006] Starting from this point, the fundamental problem of the present invention is to provide a top apron holder for an apron drafting apparatus that can quickly and variably compensate for tolerances in apron length in a simple manner, and an apron drafting apparatus including such a top apron holder.

[0007] The present invention solves this problem with a top apron holder having the features described in claim 1 and an apron draft device having the features described in claim 9. Advantageous improvements of the present invention are described in the dependent claims.

[0008] A distinctive feature of the present invention is that the apron guide unit has a housing portion and a tensioning element positioned corresponding to an inlet section for a tensioning element that is pressable against the inner surface of the top apron and is replaceable. The housing portion may preferably be formed integrally with the apron guide section in the region of the inlet section, or may be formed as a separate component that can be connected to the inlet section, for example, via a support unit, as will be described in more detail below. The housing portion and the tensioning element replaceably housed within the housing portion are formed spaced apart 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, the top apron is guided by the tensioning element while forming gaps between the tensioning element and the deflection section and between the inner surface of the top apron and the opposing surface side of the apron guide section during the operation of the top apron holder. A guide plane formed by tensioning elements and deflection sections, which coincide with the inner surface section of the supplied top apron, extends spaced apart from the surface section of the apron guide section, which is enclosed by the tensioning elements and deflection sections in the guide direction or along the guide plane. Individual adjustment of the apron tension is possible according to the configuration of the tensioning elements, which can form uniform tension according to their configuration, based on their position within the top apron in the operating state. Tolerances in the apron length can be compensated through the dimensions of the tensioning elements, in which case the apron tension can be adjusted with high precision.

[0009] According to one preferred embodiment of the present invention, the apron guide section has a deflection element and a separate housing formed at the end forming the deflection section for housing a replaceable deflection element for deflecting a top apron that is guided in a circulating manner. This allows for a simple form of support for the guide of the top apron that protrudes toward the surface side of the apron guide section. Thus, the deflection section or deflection element with the separate housing is configured for a defined guide of the top apron. In particular, the use of a deflection element formed separately from the apron guide section further enables precise adjustment of the spacing of the apron relative to the downstream outlet roller pair, which is important for uniform yarn quality and splice quality. Through the use of the deflection element, the spacing can be adjusted precisely and reproducibly. Furthermore, depending on its configuration, the deflection element can form an additional tensioning element that can facilitate and support the adjustment of apron tension with high precision.

[0010] The configuration of the tensioning element and its arrangement on the top apron holder in the entrance area of ​​the apron guide section, as well as the configuration of the deflection element and its arrangement on the top apron holder in the deflection area of ​​the apron guide section, are basically freely selectable. However, according to a particularly advantageous configuration of the present invention, the housing section and / or another housing section is formed by two spaced-apart guide means for guiding the top apron laterally, and the tensioning element or deflection element is formed as a guide rod positioned in the area between the guide means, the guide rod extending into the housing section or another housing section in the direction of its longitudinal axis toward the guide means, and both guide means are positioned particularly on the side edge of the apron guide section and are particularly integrally formed on this side edge.

[0011] This orientation of the guide rods relative to the guide means, which extends laterally with respect to the circulation direction of the top apron, ensures the uniform application of tension to the top apron by the guide rods, and the orientation of the guide rods extending laterally with respect to the guide means that guide the top apron laterally ensures that the guide rods do not apply forces to the top apron that act laterally with respect to the circulation direction of the top apron. In particular, this lateral orientation effectively prevents twisting of the top apron at the contact points with the guide rods. Particularly preferable, the tensioning elements or deflection elements are housed perpendicular to the circulation direction of the top apron in their respective housings or in other housings, so that a pressing force directed exclusively in the guide direction is applied to the tensioning elements and their housings or the deflection elements and their other housings.

[0012] The arrangement of tensioning elements or deflection elements, particularly as guide rods formed individually or separately, can be in essentially any form. Therefore, for example, it becomes possible to detachably position and fix tensioning elements or deflection elements to the top apron holder, thereby allowing the use of guide rods with different configurations and contact surfaces of different lengths, depending on the tension to be adjusted in the top apron and / or, with respect to the deflection elements, the spacing to be adjusted relative to the exit roller, thereby achieving optimal positioning of the top belt.

[0013] According to one preferred embodiment of the present invention, the tensioning element and / or deflection element has at least one retaining pin, and a housing or another housing is formed to accommodate the retaining pin for a replaceable housing of the tensioning element or deflection element, and at least one retaining pin extends laterally with respect to the guide web that guides the top apron of the tensioning element or deflection element. For example, in a preferred variation having only one retaining pin, the tensioning element or deflection element forms a T-shape in cross-section in a cutting plane running along the guide web through the guide web and the retaining pin. In one particularly preferred variation having two retaining pins, such a cross-sectional shape transitions to a π-shape, and this π-shaped cross-section allows for greater stability than the T-shaped cross-section.

[0014] According to one preferred modification of the present invention, a support unit is provided which is arranged in correspondence with the apron guide unit, the support unit forming a dwelling for a tensioning element or another dwelling for a deflection element, the tensioning element or deflection element being detachably disposed in the support unit, in particular as a guide rod, and the support unit is supported by a top apron holder, in particular the apron guide unit.

[0015] According to this configuration of the present invention, a support unit is positioned on the top apron holder, and the support unit is formed for the detachable, and therefore replaceable, housing of a tensioning element or deflection element. The use of the support unit ensures the possibility of adapting the support unit to the configuration of the tensioning element or deflection element and performing easy replacement of the tensioning element or deflection element to adjust the desired apron tension or the gap to the outlet roller. The support unit housing the tensioning element or deflection element is supported on the top apron holder in a position that ensures secure contact of the tensioning element or deflection element with the inner surface of the top apron when the top apron holder is in operation, while simultaneously allowing for easy replacement of the tensioning element or deflection element as needed. More preferably, the support unit is positioned such that the housing or another housing is located adjacent to a lateral guide means in the circulation direction or guide direction of the top apron.

[0016] According to one preferred embodiment of the present invention, a tensioning element in a housing and / or a deflection element in another housing are supported or housed with a preload applied in the direction opposite to the apron guide section, i.e., in the direction of the top apron, particularly with a spring preload. The preloaded mounting of the tensioning element or deflection element to the inner surface of the top apron ensures that the preload is applied particularly uniformly to the top apron, and that the vibrations that occur during operation can be compensated for by the preload, particularly the spring preload, thereby ensuring the operation of the apron draft device equipped with the top apron holder without particular problems.

[0017] Particularly preferable, a spring unit is provided in a housing and / or another housing. More preferably, the spring unit may be located within the housing or another housing. This spring unit allows for the replacement of the tensioning element or deflection element as needed, while maintaining the preload formed by the spring unit, thereby enabling quick and convenient adaptation to various top aprons. Particularly advantageous, the spring unit is specified to be configured to adjust the preload acting on the tensioning element or deflection element.

[0018] The ability to adjust the preload allows for adaptation to the apron length and the apron tension to be achieved or the spacing to the downstream outlet roller, in a particularly precise and convenient manner, without necessarily requiring the replacement of tensioning or deflection elements for the desired adaptation.

[0019] Supplementary or alternative, according to one more preferred configuration of the present invention, a housing and / or another housing is formed to interchangeably house at least one adapter element, the at least one adapter element being connectable to a tensioning element and / or deflection element, thereby allowing the position of the tensioning element or deflection element to be changed or adapted to the apron surface section when connected and housed. According to this configuration of the present invention, the apron tension can be individually adjusted by using different adapter elements. Thus, the selected apron tension can be set in a simple manner by exchanging differently configured adapter elements. Accordingly, the adapter element may be configured, for example, by cutting a slit so that the adapter element can be fitted onto the tensioning element or deflection element, or onto a retaining pin positioned corresponding to the tensioning element or deflection element, and easily removed again as needed.

[0020] According to another aspect of the present invention, an apron drafting device is proposed for a textile machine, such as a roving machine, in particular for a flyer, or for a spinning machine, in particular for a ring spinning machine or a pneumatic spinning machine, comprising a drivable first pair of rollers and a drivable second pair of rollers for drafting slivers, wherein the first pair of rollers and the second pair of rollers are spaced apart from each other in the sliver conveying direction to transport slivers by gripping them between the upper and lower rollers of each pair of rollers, wherein the first pair of rollers and the second pair of rollers are drivable at different rotational speeds from each other to form a drafting zone located between the gripping lines of the first pair of rollers and the second pair of rollers when the apron drafting device is in operation, and a top apron holder is positioned between the first pair of rollers and the second pair of rollers, the top apron holder circulates in the drafting zone along the sliver conveying direction for the top apron wrapped around the upper roller of the first pair of rollers. The apron draft device is characterized in that the top apron holder is configured according to one preferred embodiment described above.

[0021] Embodiments of the present invention will be described below with reference to the drawings. [Brief explanation of the drawing]

[0022] [Figure 1] This is a perspective view of the top apron holder. [Figure 2a] This figure shows a first embodiment of the adapter element. [Figure 2b] This figure shows a second embodiment of the adapter element. [Figure 2c] This figure shows a third embodiment of the adapter element.

[0023] Figure 1 shows a perspective view of the top apron holder 1 of an apron drafting device (not shown) according to one embodiment.

[0024] A top apron holder 1 comprises two top roller support units 2 arranged spaced apart from each other, and these top roller support units 2 are coupled to a base carrier 9 of an apron guide unit 4.

[0025] The apron guide unit 4 has an apron guide section 11. In the operating state of the top apron holder 1, the apron guide section 11 is laterally defined by web-shaped guide means 5 that define the lateral running path of an endless top apron (not shown). During operation, the top apron is guided in the direction of the apron guide section 11 via the top roller 3. To receive the top apron, the apron guide section 11 has an inlet section 11a and a diverting section 6 spaced apart from the inlet section 11a. The diverting section 6 includes a rod-shaped diverting element 6a that guides the top apron around its periphery. The diverting element 6a is exchangeably held in a separate receiving portion (not shown). The diverting element 6a is formed as a guide rod. Depending on the configuration of the diverting element 6a, the spacing of an outlet roller pair (not shown) of an apron drafting device relative to the downstream top roller in the sliver conveying direction can be variably adapted.

[0026] In order to generate a desired apron tension, a tensioning element 7 formed as a guide rod extends between the guide means 5, and the tensioning element 7 is detachably coupled 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 the contact surface. The tensioning element 7 is exchangeably held in a receiving portion 10, and according to this preferred embodiment, the receiving portion 10 is formed by the guide means 5. Alternatively, according to an embodiment not shown, the receiving portion may be a component part of a support unit arranged correspondingly to the apron guide unit 4, the tensioning element 7 is detachably arranged on this support unit, and the support unit is supported on the top apron holder 1. It should be noted that the receiving portion may be in contact with the guide means 5 in the guide direction or may be arranged adjacent thereto.

[0027] The apron tension and the distance to the exit roller can be changed by arranging various adapter elements 8a, 8b, 8c (see Figures 2a-2c) corresponding to the tensioning element 7 or deflection element 6a, and each adapter element 8a, 8b, 8c can be housed in the housing 10 or another housing. When housed and connected to the tensioning element 7 or deflection element 6a, the adapter elements 8a, 8b, 8c cause a change in the position of the tensioning element 7 or deflection element 6a relative to the apron surface section 11, and therefore cause a corresponding change in the apron tension or the distance to the exit roller, depending on the adapter element 8a, 8b, 8c used or the configuration of the adapter elements. The adapter elements 8a, 8b, 8c can be detachably coupled to the tensioning element 7 and / or deflection element 6a, fitted over the tensioning element 7 and / or deflection element 6a, and therefore can be easily pulled out from the tensioning element 7 and / or 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. Guiding means 6. Direction Classification 6a Deviating elements 7. Tensioning elements / guide rods 8a, 8b, 8c adapter elements 9 Base Carrier 10 Storage Unit 11 Apron Guide Classification 11a Entrance section

Claims

1. A top apron holder (1) for an apron drafting device of a textile machine, - An apron guide unit (4) for circulating the top apron wrapped around the top roller (3) of the apron draft device, comprising an apron guide section (11) for guiding the top apron, the apron guide section (11) is - An entrance section (11a) that accommodates and guides the top apron, - A deflection section (6) spaced apart from the entrance section (11a) for deflecting the guided top apron and The apron guide unit (4) has, - A top roller support unit (2) for supporting the top apron holder (1) and for positioning the apron guide unit (4) downstream of the top roller (3) in the circulation direction of the top apron, and In a top apron holder equipped with, The apron guide unit (4) has a housing (10) positioned corresponding to the entrance section (11a) for a tensioning element (7) that can be pressed against the inner surface of the top apron and is replaceable, and the housing (10) and the tensioning element (7) replaceably housed within the housing (10) are formed spaced apart from the 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). The apron guide section (11) has, at the end forming the deflection section (6), another housing section formed for housing a replaceable deflection element (6a) for deflecting the top apron which is guided in a circulating manner, and the deflection element (6a), A top apron holder wherein the housing portion (10) is formed by two spaced-apart guide means (5) for guiding the top apron laterally, and the tensioning element (7) is formed as a guide rod positioned in the region between the guide means (5), the guide rod extending into the housing portion (10) in the direction toward the guide means (5) along its longitudinal axis.

2. The top apron holder (1) according to claim 1, wherein the tensioning element (7) and / or the deflection element (6a) have at least one retaining pin, the housing (10) or the other housing is formed to house the retaining pin for a replaceable housing of the tensioning element (7) or the deflection element (6a), and the at least one retaining pin extends laterally with respect to a guide web that guides the top apron of the tensioning element (7) or the deflection element (6a).

3. The housing portion is a component of a support unit arranged in correspondence with the apron guide unit (4), the tensioning element (7) is detachably disposed on the support unit, and the support unit is supported by the top apron holder (1), as described in claim 1 or 2.

4. The top apron holder (1) according to claim 1 or 2, wherein the tensioning element (7) in the housing section (10) and / or the deflection element (6a) in the other housing section (10) are supported with a preload applied in the direction opposite to the apron guide section (11).

5. The top apron holder (1) according to claim 4, wherein a spring unit is correspondingly positioned in the housing portion (10) and / or the other housing portion, and the spring unit is configured to adjust the preload acting on the tensioning element (7) or the deflection element (6a).

6. The top apron holder (1) according to claim 1 or 2, wherein the housing portion (10) and / or the other housing portion are formed to interchangeably house at least one adapter element (8a, 8b, 8c), and the at least one adapter element (8a, 8b, 8c) is connectable to the tensioning element (7) and / or the deflection element (6a), thereby allowing the position of the tensioning element (7) or the deflection element (6a) relative to the apron guide portion (11) to be changed when connected or housed.

7. An apron drafting device for textile machinery, - A first and second drivable roller pair for drafting slivers, wherein the first and second roller pairs are spaced apart from each other in the sliver transport direction to grip and transport the slivers between the upper and lower rollers of each roller pair, and the first and second roller pairs are drivable at different rotational speeds from each other to form a draft zone located between the gripping lines of the first and second roller pairs when the apron drafting device is in operation, - A top apron holder (1) is positioned between the first roller pair and the second roller pair, and in the draft zone, it guides the top apron wrapped around the top roller (3) of the first roller pair in a circulating manner along the sliver conveying direction. In an apron draft device that includes, Apron draft device, characterized in that the top apron holder is the top apron holder (1) according to claim 1 or 2.

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