Carding machine with screw-down device

Abstract

The invention relates to a carding machine (100) having a cylinder (4) and a revolving cover plate (17) having a cover plate strip (20) which surrounds a partial region of the circumference of the cylinder (4), the cover plate strip (20) being guided on both sides by means of a drive belt (24) at a distance from one another and being moved along a slide strip (18) by means of slide elements or pins (20a) of the cover plate strip, the drive belt (24) is guided around at least two deflection rollers (21), and in the transition region of the cover strip (20) from the slide bar (18) around the deflection rollers (21) or in the transition region from the deflection rollers (21) to the slide bar (18), a pressing device (25) is arranged, which is designed to press the cover strip (20) onto the slide bar (18). The invention is characterized in that the depressor is configured to counteract a change in the carding gap between the clothing of the cylinder (4) and the clothing of the cover strip (20).

Description

Technical Field

[0001] The present invention relates to a carding machine having a cylinder and a rotary cover plate as described in the preamble of claim 1, the rotary cover plate having cover plate strips surrounding a portion of the circumference of the cylinder. Background Technology

[0002] When cleaning or carding fibrous materials, such as cotton and / or synthetic fibers, stationary or surrounding cleaning or carding elements are generally positioned opposite rotating rollers equipped with card cloths. For optimal cleaning or carding results, these elements must be positioned as close as possible to the card cloth arrangement on the rotating rollers. Adjustments are made in a cold state and while the rollers are stationary. The effective distance between the tip of the card cloth and the carding element opposite it is called the carding gap. The carding gap is critical to carding quality. The size (width) of the carding gap is a key machine parameter that affects both the fiber handling technique and the machine's operating characteristics. The carding gap should be adjusted to be as narrow as possible, while avoiding the risk of working elements "colliding." To ensure uniform fiber handling, the gap must be kept as consistent as possible across the entire working width of the machine. The carding gap is particularly affected by both machine adjustments and the state of the card cloths. The most critical carding gap in a rotary carding machine is located in the main carding zone, between the cylinder and the rotary cover mechanism. At least one adjacent card cloth is in motion at this working distance; typically, both card cloths are in motion.

[0003] The rotary cover system, which together with the cylinder forms the main combing zone, consists of multiple cover strips guided around the cylinder. The circular movement of the cover strips is achieved by a driven, circular transmission belt, with the cover strips interacting with the belt at their ends via pins or guide elements. Here, the transmission belt is guided by two steering wheels, at least one of which is driven. The cover strips are guided through an arc-shaped strip within the cylinder's area, the coaxial distance between the strip and the cylinder being adjustable. As the cover strip moves downwards on the arc-shaped strip (also known as a curved track depending on the structural type), it tilts based on its center of gravity after reaching a specific angle. The transmission belt tensioned on the arc-shaped strip exerts contact pressure on the cover strip, preventing it from tilting. Shortly before the steering wheels, before the cover strip leaves the guiding area of ​​the arc-shaped strip, the transmission belt tangentially exits from the arc-shaped strip. In this area, no further contact pressure is exerted on the cover strip via the transmission belt, and the cover strip may tilt. As a result, the gaps between the combs will widen at this location, making it impossible to guarantee an effective combing result.

[0004] EP 0753610 B1 discloses a drive belt for cover strips, which has two webs on the belt side for each cover strip, the webs working in conjunction with a sliding element at the end of the cover strip. The webs have an engaging connection function and work in accordance with the shape of the cover strip, thereby preventing the cover strip from lifting at the curved end of the strip.

[0005] It is known that in the turning area, shortly before the cover strip is lifted from the sliding bar towards the turning roller, a so-called presser guides the cover strip in a certain way, so that the combing gap remains constant for as long a distance as possible. Until now, pressers have either been constructed very statically and function only as guides located above, or have complex pressing systems for multiple pressers, which are now very costly and expensive to implement with the large number of sensors installed. Summary of the Invention

[0006] The objective of this invention is to improve a carding machine in which an improved presser ensures that the cover strips are easily guided to the steering rollers of a rotating cover.

[0007] This task is solved based on the features of the device and cover strip combination feature as described in the preamble of claim 1. Advantageous extensions of the invention are specified in the dependent claims.

[0008] According to claim 1, this invention relates to a carding machine having a cylinder and a rotary cover plate, the rotary cover plate having a cover plate strip surrounding a portion of the circumference of the cylinder. The cover plate strip is guided on both sides by means of a drive belt spaced apart from each other and is moved along the slide strip by means of its sliding element or pin. Here, the drive belt is guided around at least two guide rollers, wherein a presser is fixedly arranged at a position in the transition region of the cover plate strip from the slide strip around the guide rollers or in the transition region from the guide rollers to the slide strip. The presser is configured to press the cover plate strip onto the slide strip.

[0009] This invention includes the following technical teaching: the presser is configured to counteract variations in the carding gap between the carding cloth of the cylinder and the carding cloth of the cover strip. This makes it possible to maintain a constant carding gap along the slide bar up to its end region, regardless of the size of the carding gap.

[0010] Here, the presser has a bearing element with an upper side, two end sides, and a lower side, wherein the lower side is concave and acts with pressure on the sliding element or pin of the cover strip. By pressing the sliding element or pin against the sliding strip in the turning area of ​​the cover strip, the tipping of the cover strip is prevented and the combing gap is kept constant.

[0011] Pressure can be generated by means of at least one spring element. As an alternative to the spring element, there may be a pneumatic or hydraulic pressure pad, or any actuator that can be controlled if necessary.

[0012] Here, the presser is configured such that the lower concave side of the presser, which presses the sliding element or pin of the cover strip onto the sliding strip, changes in distance relative to the upper side. This change in distance between the upper and lower sides of the presser can be generated by a pressure element or at least one spring element.

[0013] By securing the lower side of the presser to the support element or the upper side of the presser with at least one spring element, variations in the combing gap can be counteracted by the spring travel without further adjustment of the presser. The pressure on the sliding element or pin of the cover strip can be kept nearly constant depending on the design and construction of the at least one spring element.

[0014] At least one spring element may preferably be made of an elastic synthetic material or be composed of multiple spring elements configured as compression springs, leaf springs or disc springs.

[0015] Here, at least one spring element can have increased spring force from the center of the presser toward the end side, because the largest tilting moment acts on the cover bar in the end region of the presser, and therefore the highest contact pressure is necessary. The end side with increased pressure is arranged in the transition region of the cover bar from the sliding bar around the steering roller or in the transition region from the steering roller to the sliding bar.

[0016] The presser can be constructed as an open, single-piece or modular housing with the supporting element, upper side, and two end sides. The housing can be made of, for example, a high-strength synthetic material and is preferably electrically insulated. This prevents accidental contact or short circuits during electrical carding gap adjustment in the turning area of ​​the rotary cover, which could cause the carding machine to stop.

[0017] By forming the missing, open side of the housing through the lower side, the lower side can be adjusted by means of a pressure or spring element in a manner that varies with the upper side of the presser.

[0018] At least one spring element is preferably arranged in the open housing of the presser, thereby creating a compact component on which a small amount of fiber may adhere during continuous operation.

[0019] The stop is preferably arranged on the presser to prevent the spring from popping out.

[0020] The presser can be fastened to the side guard plate, curved rail, adjusting flange, or at least one contact element of the carding machine by means of fastening elements. Thus, the presser can be easily assembled and replaced as a wear part. The presser can be constructed symmetrically or asymmetrically. In the case of a symmetrical construction, the pressure or spring force is adjustable in the end-side region.

[0021] The presser according to the invention, used on a carding machine, is configured to counteract variations in the carding gap between the carding cloth of the cylinder and the carding cloth of the cover strip. The presser has the features of any one of claims 2 to 11. Attached Figure Description

[0022] Other measures to improve the invention are shown in more detail below with the aid of the accompanying drawings, together with the description of preferred embodiments of the invention.

[0023] It is shown that:

[0024] Figure 1 shows a schematic side view of a cover-type carding machine with a device according to the present invention;

[0025] Figure 2 shows an enlarged perspective view of the turning area of ​​the rotary cover;

[0026] Figure 3a shows the front of the presser;

[0027] Figure 3b shows the presser on the back. Detailed Implementation

[0028] Figure 1 illustrates a prior art cover-type carding machine 100, in which fiber bundles are guided via a channel to a feed roller 1 and a feed plate 2, and then guided via multiple licker-in rollers 3a, 3b, and 3c to a cylinder 4 or a drum. On the cylinder 4, the fibers of the fiber bundles are parallelized and cleaned by means of a fixed carding element 13 and a surrounding cover strip 20 arranged on a rotating cover 17. A drive belt 24 (not shown) guides the rotating cover 17 via multiple guide rollers 21, the invention being illustrated in the area of ​​the guide rollers 21 shown on the right side of the following figures. The resulting fiber web is then conveyed via a doffer 5, a stripping roller 6, and multiple squeeze rollers 7 and 8 to a fiber web guiding element 9, which uses a bell 10 to deform the fiber web into fiber strips, which are then transferred via traction rollers 11 and 12 to a subsequent processing machine or a sliver can 15. The adjustment of the cover strip 20 relative to the cylinder 4 is achieved by means of the curved rail 23 or the sliding bar 18 (not shown here). The curved rail or the sliding bar may have elements that are oriented relative to each other in a wedge-shaped manner.

[0029] Figure 2 shows the area of ​​the steering roller 21 in detail. The curved rail 23 is arranged and secured to the side guard plate 16 of the cover plate carding machine by means of an adjusting screw 19, so that the curved rail 23 is concentrically adjustable relative to the cylinder 4. A sliding bar 18 can be arranged on the curved rail 23, along which the pin 20a of the cover plate bar 20 slides. Different embodiments of the sliding bar 18 exist, however these embodiments are not important to the present invention.

[0030] The radii of the curved rail 23 and the sliding strip 18 arranged thereon are concentrically adjusted relative to the radius of the cylinder 4, because the cover strip 20 is guided against the rotation direction of the cylinder 4 during its cover travel and should always have a constant gap (combing gap) relative to the cylinder 4. The cover strip 20 slides on the upper side of the sliding strip 18 by means of its sliding element or pin 20a, which is guided and moved spaced apart from each other by the drive belt 24. Different technical solutions exist for determining the combing gap, one of which is to calibrate the combing gap by means of an electrical short circuit. Here, the sliding element or pin 20a can, for example, work in conjunction with a contact element 22, which can, for example, be arranged laterally on the sliding strip 18 or the curved rail 23. Alternatively, a conductive connection can also be achieved between the cover strip 20 and the contact element 22. Thus, electrical contact during calibration is achieved through the tip of the needle cloth of the cover strip 20, through the conductive base of the cover strip 20 to the sliding element or pin 20a electrically connected to the base, and to the contact element 22.

[0031] Independent of the technical solution for intermittent combing calibration, this invention provides a presser 25 in the transition region of the cover strip 20 from the sliding strip 18 around the guide roller 21. Using this presser, the combing gap can also be maintained in the starting and ending regions of the main combing zone. Depending on its position on the sliding strip 18, the cover strip 20 has a tendency to tilt based on its center of gravity. This tendency to tilt is prevented in the large area of ​​the main combing zone by pressing the cover strip 20 against the drive belt 24 on the sliding strip 18. During the rotational stroke of the cover strip 20 along the sliding strip 18, before and after the guide roller 21, the drive belt 24 no longer applies the necessary force, causing the cover strip 20 to leave the arcuate guide region of the sliding strip 18. Thus, the combing gap increases at this position, and therefore effective combing is no longer guaranteed. The embodiment shown in Figure 2 illustrates the arrangement of the presser 25, in which the drive belt 24 runs behind the presser 25, and the presser 25 is configured with its concave lower side 25b to guide the pin 20a of the cover strip 20 to the end of the sliding strip 18 and press the pin onto the sliding strip, thereby conforming to the previously set combing gap. The presser 25 may be fixedly arranged on the side guard plate 16, curved rail 23, or adjusting flange of the cover carding machine and configured to counteract changes in the combing gap. Alternatively, the presser 25 may also be at least partially or completely fastened to one or two contact elements 22.

[0032] Therefore, according to Figures 3a and 3b, the presser 25 is constructed such that its concave lower side 25b counteracts the distance variation of the cover strip 20 relative to the cylinder 4. The presser 25 is structurally constructed as a housing, in which a support element 26 forms the basic structure, with an upper side 25a and two end sides 25c, 25d extending orthogonally away from this support element. Thus, the support element 26 forms an open housing with its upper side 25a and two opposing end sides 25c, 25d. The missing open side of the housing is formed by the lower side 25b, which is fastened to the presser by means of at least one spring element 28. At least one spring element 28 is arranged inside the open housing of the presser 25 and can be supported from the inside on the upper side 25a of the presser 25. At least one spring element 28 can also be supported on the inner side of the support element 26, on which ribs or webs for fastening or supporting the spring element 28 or spring legs are arranged, for example. The elastically arranged lower side 25b of the presser 25 is configured to counteract changes in the carding gap by means of the spring travel of at least one spring element 28. In other words, the presser 25 utilizes its elastic lower side 25b to counteract changes in the distance between the cover strip 20 and the cylinder 4. Here, the presser 25 is fixedly fastened to the cover-type carding machine. The elastically arranged lower side 25b of the presser 25 presses the pin 20a of the cover strip against the sliding strip 18 regardless of the size of the carding gap. The presser 25 can be made of a high-strength synthetic material in a single piece, consisting of the support element 26, the upper side 25a, and the two end sides 25c, 25d, and its construction is electrically insulating. The elastically arranged lower side 25b of the presser 25 can be made of a different material than the support element 26 and is constructed to be particularly flexible and wear-resistant. The lower side 25b can be easily replaced upon wear.

[0033] At least one spring element 28 can be constructed as a single piece or composed of multiple elastic composite material elements arranged inside the presser 25. At least one spring element 28 can also be composed of multiple spring elements 28a-28g, arranged inside the presser 25 and directly or indirectly supported on the support element 26 or internally supported on the upper side 25a. In this embodiment, the spring elements 28a-28g are constructed, for example, as leaf springs made of spring steel. Here, the spring force of the spring elements 28a-28g can increase from the center of the presser 25 towards the end side 25c, because the maximum contact pressure on the pin 20a of the cover strip 20 is required there to maintain the preset combing gap. This can also be seen in Figure 2, where the end side 25c is located in the turning region of the cover strip 20 from the sliding bar 18 to the turning roller 21, and where the maximum pressure is required. Marked as 29a and 29b are fastening elements in the form of tabs or holes used to secure the presser 25 to the side guard plate 23 or adjusting flange and / or contact element 22 of the squeegee carding machine. Thus, the presser 25 is constructed asymmetrically, making it necessary to increase the spring force only on one end side 25c of the presser 25. Therefore, for the squeegee carding machine, two pairs of mirror-symmetrical pressers 25 are required. In the case of a symmetrical construction of the presser 25, four identical pressers 25 can be used for both sides of the squeegee carding machine, wherein the increased spring force in the area of ​​one end side 25c is achieved by replacing or adjusting the pressure element. The support element 26 is oriented with one side facing the side of the squeegee carding machine, such that the open housing is oriented towards the cylinder 4. Unmarked openings in the support element 26 are used to clean the components and assemblies arranged in the open housing by means of compressed air to remove fibers from them.

[0034] The lower side 25b can be connected to the presser 25 via at least one spring element 28, for example by means of a clamp. Alternatively, the connection between the lower side 25b and the bearing element 26 or the upper side 25a may also be hinged and flexible, wherein the spring element 28 transmits contact pressure between the lower side 25b and the bearing element 26 or the upper side 25a. A stop, not marked, limits the spring travel, thereby preventing complete ejection.

[0035] The presser 25 according to the invention is used twice on each side of the cylinder 4 on a cover-type carding machine (see FIG. 1), that is, after the left large steering roller 21 and before the right large steering roller 21 during cover rotation.

[0036] The invention is not limited in its embodiments to the preferred embodiments given above. Rather, many variations are contemplated that utilize the presented solution even in fundamentally different embodiments. All features and / or advantages derived from the claims, description, or drawings, including structural details or spatial arrangements, are inventive not only in themselves but also in various combinations.

[0037] List of reference numerals

[0038] 100-type carding machine

[0039] 1 Feed roller

[0040] 2 feed plate

[0041] 3a, 3b, 3c licker rollers

[0042] 4 Xilin

[0043] 5 dolf

[0044] 6 peeling rollers

[0045] 7 extrusion rollers

[0046] 8 extrusion rollers

[0047] 9 Fiber mesh guiding elements

[0048] 10-mouth bell

[0049] 11 traction rollers

[0050] 12 traction rollers

[0051] 13 Combing components

[0052] 15 tubes

[0053] 16 side guards

[0054] 17 Rotary Cover Plate

[0055] 18 sliders

[0056] 19 Adjusting screw

[0057] 20 cover strips

[0058] 20a sales

[0059] 21 steering rollers

[0060] 22 Contact Elements

[0061] 23 curves

[0062] 24 transmission belt

[0063] 25 Presser

[0064] 25a upper side

[0065] 25b lower side

[0066] 25c, 25d end sides

[0067] 26 load-bearing elements

[0068] 27. Elastic sliding element

[0069] 28a-g spring element

[0070] 29a, b Fastening elements.

Claims

1. A carding machine (100) having a cylinder (4) and a rotary cover (17), the rotary cover having cover strips (20) surrounding a portion of the circumference of the cylinder (4), wherein, The cover strip (20) is guided on both sides by means of a drive belt (24) spaced apart from each other and moved along the slide strip (18) by means of a sliding element or pin (20a) of the cover strip, wherein the drive belt (24) is guided around at least two steering rollers (21), and a presser (25) is fixedly arranged in the transition region of the cover strip (20) from the slide strip (18) around the steering rollers (21) or in the transition region from the steering rollers (21) to the slide strip (18), the presser being configured to press the cover strip (20) onto the slide strip (18), characterized in that the presser is configured to counteract the combing gap variation between the carding cloth of the cylinder (4) and the carding cloth of the cover strip (20).

2. The carding machine according to claim 1, characterized in that, The presser (25) has a bearing element (26) with an upper side (25a), two end sides (25c, 25d) and a lower side (25b), wherein the lower side (25b) is concave and acts on the sliding element or pin (20a) of the cover strip (20) with pressure.

3. The carding machine according to claim 2, characterized in that, The pressure is generated by means of at least one spring element (28).

4. The carding machine according to claim 2, characterized in that, The lower side (25b) of the presser (25) changes in distance relative to the upper side (25a).

5. The combing machine according to any one of the preceding claims, characterized in that, The lower side (25b) of the presser (25) is fastened to the bearing element (26) or the upper side (25a) of the presser (25) by means of at least one spring element (28).

6. The carding machine according to claim 3, characterized in that, At least one of the spring elements (28) is made of an elastic synthetic material or is made of multiple spring elements (28a-28n) configured as compression springs, leaf springs or disc springs.

7. The carding machine according to claim 3, characterized in that, At least one of the spring elements (28) has an increased spring force from the center of the presser (25) toward the end side (25c), the end side being located in the transition region of the cover strip (20) from the slide bar (18) around the steering roller (21) or in the transition region from the steering roller (21) to the slide bar (18).

8. The carding machine according to claim 1, characterized in that, The presser (25) is constructed as an open, single-piece or one-piece housing with the bearing element (26), the upper side (25a) and the two end sides (25c, 25d).

9. The carding machine according to claim 8, characterized in that, The missing, open side of the outer shell is formed by the lower side (25b).

10. The carding machine according to claim 8, characterized in that, At least one of the spring elements (28) is arranged in the open housing of the presser (25).

11. The combing machine according to any one of the preceding claims, characterized in that, The presser (25) is fastened to the side guard plate (16), curved rail (23), adjusting flange or at least one contact element (22) of the carding machine (100) by means of fastening elements (29a, 29b).

12. A presser (25) for use on a carding machine (100), the presser being configured to counteract changes in the carding gap between the carding cloth of the cylinder (4) and the carding cloth of the cover strip (20), the presser having the features of any one of claims 2 to 11.

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