JP2021063326A - Drawing apparatus and method for air spinning machines with multiple feeds - Google Patents

Abstract

To provide a drawing apparatus suitable for air spinning machines with multiple feeds.SOLUTION: There is provided a drawing apparatus 4 for air spinning machines with multiple feeds, comprising first and second introducer elements 8, 12 capable of simultaneously and independently feeding two separate webs N1, N2 of textile fiber, an air spinning device 16, a drawing device 24. A drive roller 32 of drawing rollers 28 is mechanically split into a first drive roller and a second drive roller, the first and second drive rollers being connected to separate drive means to perform different degrees of drawing of the two webs. The first drive roller is associated with a first idle roller 52 and the second drive roller is associated with a second idle roller 56, the idle rollers being mechanically separate from each other. A thrust device is associated with the first and second idle rollers, which preloads each elastically in contact with the respective drive rollers in a symmetric and equivalent manner so as to apply to the drive rollers the same preload.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for a stretching device and an air spinning machine having a plurality of supply ports.

As is known, for example, an air jet type air spinning device starts from a single web of fibers to produce yarn. A particular area of development of the invention is from multiple feed ports, i.e. from more (at least two) webs of different materials, different colors (melanges), different qualities, or fibers that may be the same. This is the development area of the obtained yarn. Such multiple feed webs must be properly stretched and mixed to produce yarns with the desired characteristics.

To date, there are two types of processes for obtaining webs of different colors or materials. The first involves weighing the raw materials (eg, 50% cotton and 50% polyester) based on the percentages obtained and then putting them into a standard web manufacturing cycle. The second type, on the other hand, prepares multiple webs, usually 6 or 8 suitable thread counts, for each material constituting the mixture, and finally obtains a homogeneous web with the desired thread count. It is repeatedly bonded with a stretching frame until it is made. In any case, the number of webs bound to each material is directly proportional to the percentage ratio obtained. The result is, in both cases, a web of mixed materials with a good mixture of different fibers used, for example, to feed an air jet type air spinning machine. However, while the conventional process described above guarantees good quality of the resulting yarn, it is costly as the bonding of different mixtures requires additional care and processing. Known processes of this type are currently used for melange type yarns and mixed yarns (cotton / polyester, cotton / viscose, etc.).

In addition, known solutions have the disadvantage of requiring processing into a single web made of mixed material: thereby making the introduction tube of such mixed web in the stretching device, for example, mixed web. It is susceptible to contamination by the fibers of the coloring material embedded inside itself. This means that passage from one mixed web to another requires prophylactic cleaning of the inlet tube to prevent it from getting mixed into the next web.

In addition, known solutions introduce the need to modify the spinner's calibration depending on the mixed yarn being machined. This means that the machine settings need to be changed depending on the thread count of the mixed web that is sometimes stretched.

In addition, changing the percentage of mixed yarn raw material requires "recreating" the web according to the new ratio, and therefore each time the percentage of the final web single material changes, the web The setting of the preparation line is changed.

It is also known to manufacture spinning machines in which the webs introduced by each introduction tube are individually drawn together by a pair of drawing rollers with separate motors. Thus, such separation allows the webs to be stretched individually and differently from each other according to the required needs before the webs are then fed to the spinning chamber. This solution ensures that the composition of the yarn is more accurately calibrated by precisely processing the web according to the starting characteristics (thread count, color, origin) of the web itself before being joined in the spinning room. It will be possible. Nonetheless, such known solutions work only when different adjustments / processes for individual webs are optimized and very accurately distinguished. In other words, different processes that can be applied to the web need to be effective and easy to obtain. In fact, prior art devices cannot guarantee differentiated machining accuracy for individual webs. In other words, even if such a known solution, from a theoretical point of view, can optimize thread formation by separating the processes on the individual webs, from a practical point of view. It is not possible to actually optimize the processing differences of the web itself imposed for different yarns, as known equipment does not provide the required processing accuracy and the required sensitivity to changes in settings, especially during drawing.

In particular, known solutions include the use of thrust means that elastically influence each pair of laterally juxtaposed idle rollers towards the corresponding pair of drive rollers. Such elastic forces are important to stretch the web without tearing the fibers so that the number of fibers involved in the stretching can be adjusted as much as possible. Working loads on each of the two webs typically range from 12 to 18 kg and are adjusted according to the material processed to operate at the minimum load that ensures that the fibers are pinched without tearing the fibers and their thread counts. There is a need.

However, since the known solutions come from two different settings, it is not possible to apply equal loads to the drawing rollers. In particular, the standard solution is, for structural reasons, substantially formed by a beam wedged at one end, the inner end (which supports the rotation of the rollers), while the thrust means, on the other hand, Since the action is applied from the side of the cantilever end on the opposite side, it does not create a common pressure on both rollers. This means that known solutions may not be equivalent to symmetrically pressed beams.

The asymmetry of the deformation of the beam supporting the load and the idle roller is that the elastically affected roller is subject to an asymmetric load due to the inevitable asymmetric deformation of the cantilever structure, regardless of the adjustment of the elastic means. Means. This cancels the precise adjustment by the elastic means and cannot provide a fine adjustment of the stretch of the web.

Moreover, in known systems, the two rollers are mounted on two different, uniquely non-adjustable supports, so their mutual position with respect to the sliding direction of the web cannot be easily adjusted. In essence, it is very difficult to adjust them so that each of the two axes of rotation is "aligned" with each other.

Further, in known systems, the distance between the stretching unit and the next stretching unit cannot be adequately adjusted because the support structure of one of the two rollers is rigid.

Adjustment of such distance between the subsequent two drawing units is necessary or desirable when the length of the fiber being processed varies so as to standardize the results obtained as much as possible.

Therefore, the need to resolve the above drawbacks and limitations with reference to the prior art is understood.

Such a need is satisfied by the stretching apparatus for an air spinning machine having a plurality of supply ports according to claim 1 and the stretching method for an air spinning machine according to claim 19.

Further features and advantages of the present invention will be more apparent from the following description of those preferred embodiments given as non-limiting examples.

FIG. 1 shows a front view of a stretching device for an air spinning machine according to an embodiment of the present invention. FIG. 2 shows a front perspective view of the stretching device of FIG. FIG. 3 shows a front perspective view of the stretching device of FIG. 2 in which the stretching device of the present invention is omitted. FIG. 4 is a perspective view of detail IV of FIG. FIG. 5 shows a front view of the detail V shown in FIG. FIG. 6 shows a cross-sectional view of the detailed VI shown in FIG.

Elements or parts common to the described embodiments are designated below using the same reference numbers.

With reference to the above figure, reference numeral 4 as a whole indicates a stretching device for an air spinning machine having a plurality of supply ports.

The device 4 includes at least first and second introduction elements 8 and 12 independent of each other so as to simultaneously supply the webs N1 and N2 of at least two woven fibers. The webs N1 and N2 of the woven fibers may both be the same as each other and may differ in quality, thread count, color and / or material.

The device 4 further comprises an air spinning device 16 supplied by the webs N1 and N2 of the woven fibers and spun the webs N1 and N2 of the woven fibers to produce yarns having specific characteristics.

For the purposes of the present invention, the air spinning device 16 can be of any type, shape, and size.

For example, the air spinning apparatus 16 interweaves the webs N1 and N2 to obtain a single yarn F at the output from the air spinning chamber 20 with respect to the webs N1 and N2 itself at the input to the spinning chamber 20 itself. It has a spinning chamber 20 having a plurality of air jets (not shown) oriented substantially tangentially.

As a variation of the feasible embodiment, the spinning chamber 20 may also have mechanical parts that are movable under the thrust of compressed air.

The device 4 further comprises a stretching device 24 with a plurality of pairs of stretching rollers 28 having at least one drive roller 32 per pair 28 disposed between the introduction elements 8 and 12 and the air spinning device 16. The stretching roller 28 is adapted to perform progressive drawing of each web and at the same time intercept by them in a known manner.

The drive roller 32 means a roller operably connected to a drive means, typically an electric motor. Normally, each drive roller 32 faces the idle roller 36, and the idle roller presses the webs N1 and N2 with an appropriate pressure and is operated by the drive roller 32 coupled to the webs N1 and N2.

According to one embodiment, the pair of at least one drive roller 32 of the stretching roller 28 of the spinning device 4 captures the first drive roller 40 that captures the first web N1 and the second web N2. It is mechanically separated from the second drive roller 44.

The first and second drive rollers 40, 44 are operably connected to separate drive means so that they can operate at different rotational speeds, and are captured by the first and second drive rollers 40, 44. Stretching of the webs N1 and N2 to different degrees is performed.

Preferably, the first drive roller 40 is associated with a first idle roller 52, the second drive roller 44 is associated with a second idle roller 56, and the idle rollers 52, 56 are associated with each other. It is mechanically separated.

With such separation, each idle roller 52, 56 can follow the degree of stretch (ie, rotational speed) imposed by the corresponding drive rollers 40, 44, independent of the other idle roller 56, 52.

According to one embodiment, the first and second separation drive rollers 40, 44 are arranged at the output directly opposite the introduction elements 8 and 12. In other words, the first and second separation drive rollers 40, 44 are first rollers that capture the webs N1 and N2 from the introduction elements 8 and 12, respectively, at the output.

Preferably, the webs N1 and N2 are supplied according to the vertical supply direction L, and the introduction elements 8 and 12 are juxtaposed along the horizontal direction Z perpendicular to the vertical supply direction L.

It should be noted that the longitudinal direction L is conventionally inclined with respect to the vertical direction Y, perpendicular to the horizontal direction X, and parallel to the support surface of the spinning apparatus 4.

The first and second separation drive rollers 40, 44 are aligned with each other in parallel with the lateral direction Z, and rotate about the lateral rotation axis in parallel with the lateral direction Z.

The number of pairs of stretching rollers 28 can vary as a function of the total stretching ratio obtained and is not constrained for the present invention.

For example, the use of two or more webs in the feed, and the resulting increase in the size of the input webs, allows the insertion of a fifth pair of stretch rollers to ensure an accurate distribution of stretches along the path. May be needed. (Usually 4 pairs of stretching rollers are used). The draw ratio is represented by the ratio of the input thread count to the output thread count.

In general, by adding a fifth pair of stretching rollers, the main stretching ratio can be kept constant and there is no need to increase the other ratios themselves, which are not as efficient as the main stretching performed on the belt.

Advantageously, the thrust device 60 is associated with the first and second idle rollers 52, 56, which in a symmetrical and equivalent manner so as to apply the same preload to the drive rollers 40, 44, respectively. A preload is applied by elastically contacting the drive roller 40 of 1 and the second drive roller 44. Preload affects quality and quantity, i.e. stretch of the web, and can be obtained under the same boundary conditions, such as rotational speed and diameters of drive rollers 40, 44.

More specifically, the thrust device 60 affects the first and second idle rollers 52 and 56, and at the same time, the first drive roller 40 and the second drive roller 44 with the same elastic load, respectively. It is composed.

In a feasible embodiment, the first and second idle rollers 52, 56 are symmetrically supported by a common support pin 64 supported by a frame 68 of the thrust device 60.

The support pins 64 have opposing axial support ends 72, 76, which are thrust devices such that they are symmetrically guided by the frame 68 in the direction of travel towards the corresponding drive rollers 40, 44, respectively. An interface is made to the upright portion 80 of the frame 68 of the 60.

Preferably, the support pins 64 are symmetrically arranged between the opposing axial support ends 72, 76, which are such that the idle rollers 52, 56 are separated from each other and spaced axially apart. It has a central shoulder 84.

The thrust device 60 includes thrust means 88 that applies elastic thrust at the opposing axial support ends 72, 76 and / or the central shoulder 84.

Preferably, at least one guide bushing 92 is inserted between each idle roller 52, 56 and the support pin 64.

For example, the at least one guide bushing 92 includes an axial shoulder 96. Preferably, each support pin 64 comprises a pair of guide bushings 92 in which the opposing axial shoulders 96 are arranged inverted. In other words, the axial shoulder 96 is located on the opposite side so as to create an axial constraint on both sides with its inserted corresponding idle rollers 52, 56.

The opposing axial support ends 72, 76 of the support pins 64 are inserted into their respective longitudinal guides 100, which are symmetrical with each other.

The longitudinal guides 100 extend perpendicular to the support pins 64, parallel to each other, along a general longitudinal direction.

Further, the frame 68 of the thrust device 60 determines the elastic thrust of the thrust arm 104 connected face-to-face on the support pin 64, the support pin 64 for each of the drive rollers 40 and 44, and the idle rollers 52 and 56 facing each other. It is provided with a mounting base having an elastic thrust means 108.

According to a feasible embodiment, the thrust arm 104 is configured to act simultaneously on the opposing axial support ends 72, 76 of the support pin 64.

According to a further embodiment, the thrust arm 104 is configured to act on the intermediate shoulder 84 of the support pins 64 located between the opposing axial support ends 72, 76.

Preferably, the thrust arm 104 is configured to act simultaneously on both the intermediate shoulder 84 of the support pin 64 and the opposing axial support ends 72, 76.

The elastic thrust means 108 may have a coil spring and / or a foil spring.

As elastic thrust means 108, hydraulic and / or pneumatic actuators can also be provided as alternatives or with coils and / or foil springs.

It should be noted that the stretching apparatus 4 according to the present invention may also be additionally manufactured and supplied. In other words, to manufacture a stretching unit with a relative thrust device 60 (shown in FIG. 4) associated with the stretching device so that the stretching of the web can be adjusted to a greater extent as needed. Is possible. A stretching device without such extras is shown in FIG.

As can be understood from the above description, the air jet type spinning apparatus according to the present invention makes it possible to overcome the drawbacks presented in the prior art.

In particular, the present invention has a uniform load because it can act independently by the force F1 at the axial end of the common support pin or the force F2 (FIG. 5) at the center of the support pin itself. Can be done. As shown, it is also possible to apply elastic preload thrust to both the opposing axial ends and the center or centerline of the support pins themselves, thus making the adjustment nearly complete, symmetrical and uniform.

From a structural point of view, the solutions according to the invention are also easy and inexpensive to manufacture and maintain.

It is therefore a mechanically different system from that of the prior art, which allows for very accurate and independent adjustment of the rest of the stretching unit, thus improving the stretching force applied to the web.

Further, the present invention makes it possible to easily change the mutual position of the two rollers with respect to the sliding direction of the web by the adjustments provided.

This adjustment of the distance between the two subsequent stretching units is particularly useful when the length of the fibers processed to standardize as much as possible varies.

One of ordinary skill in the art can make some modifications and modifications to the above air jet type spinning equipment to meet accidental and specific needs, all of which are defined by the following claims. It is within the scope of the present invention.

Claims (20)

-At least the first and second introductory elements (8, 12), independent of each other so that at least two separate woven fiber webs (N1, N2) can be supplied simultaneously.
− An air spinning device (16) suitable for spinning the webs (N1, N2) of the woven fiber,
-A pair of stretching rollers (36) having one drive roller (32) and one idle roller (36) per pair arranged between the introduction elements (8, 12) and the air spinning apparatus (16). 28) for an air spinning machine having multiple supply ports, with a stretching device (24) having stretching rollers (28) suitable for progressive stretching of each web captured by them at the same time. The stretching device (4) of
-A pair of at least one driving roller (32) of the stretching roller (28) holds a first driving roller (40) for capturing the first web (N1) and the second web (N2). It is mechanically separated from the second drive roller (44) to be captured.
-The first and second drive rollers (40,) to perform different degrees of stretching of the two webs (N1, N2) captured by the first and second drive rollers (40, 44). 44) are operably connected to separate drive means so that they can operate at different rotational speeds.
-The first drive roller (40) is associated with a first idle roller (52), the second drive roller (44) is associated with a second idle roller (56), and the idle roller. (52, 56) are mechanically separated from each other and are separated from each other.
-The thrust device (60) is associated with the first and second idle rollers (52, 56), which are symmetrical and equivalent so as to apply the same preload to the drive rollers (40, 44). A stretching device that elastically contacts the first drive roller (40) and the second drive roller (44) to apply a preload, respectively. The thrust device (60) has the same elasticity as the first and second idle rollers (52, 56) at the same time with respect to the first drive roller (40) and the second drive roller (44), respectively. The stretching apparatus (4) for an air spinning machine having a plurality of supply ports according to claim 1, which is configured to be influenced by a load. The first and second drive rollers (52, 56) are symmetrically supported by a common support pin (64) supported by a frame (68) of the stretching device (60). A stretching device (4) for an air spinning machine having a plurality of supply ports according to 1 or 2. The support pins (64) have opposing axial support ends (72, 76), respectively, in a direction that the frame (68) moves toward the corresponding drive roller (40, 44). For an air spinning machine having a plurality of supply ports according to claim 3, which is face-to-face connected to an upright portion (80) of the frame (68) of the thrust device (60) so as to be guided symmetrically. Stretching device (4). The common support pin (64) is symmetrical between opposing axial support ends (72, 76) suitable for separating the idle rollers (52, 56) from each other and spacing them axially. A stretching device (4) for an air spinning machine having a plurality of supply ports according to claim 4, further comprising a central or intermediate shoulder (84) arranged. The plurality of thrust devices (60) according to claim 5, further comprising a thrust means (88) for applying elastic thrust at the opposite axial support ends (72, 76) and / or the central shoulder (84). Stretching device for an air spinning machine having a supply port (4). The plurality of supply ports according to any one of claims 3 to 6, wherein at least one guide bushing (92) is inserted between each idle roller (52, 56) and the common support pin (64). Stretching device for an air spinning machine having (4). The stretching device (4) for an air spinning machine having a plurality of supply ports according to claim 7, wherein the at least one guide bushing (92) includes an axial shoulder (96). For an air spinning machine having a plurality of supply ports according to claim 8, each support pin (64) includes a pair of guide bushings 92 in which the opposing axial shoulders (96) are arranged so as to be inverted from each other. Stretching device (4). The opposing axial support ends (72, 76) of the support pin (64) are inserted into their respective longitudinal guides (100) that are symmetrical with each other, and the longitudinal guides (100) are generally longitudinally oriented. A stretching device (4) for an air spinning machine having a plurality of supply ports according to any one of claims 4 to 9, extending along the support pins (64) in parallel with each other and perpendicular to the support pins (64). The frame (68) includes a thrust arm (104) connected face-to-face on the support pin (64), the support pin (64) for each of the drive rollers (40, 44), and the opposing idle roller (64). 52, 56) A stretching apparatus for an air spinning machine having a plurality of supply ports according to any one of claims 4 to 10, further comprising a mounting base having elastic thrust means (88) for determining elastic thrust. (4). The air having a plurality of supply ports according to claim 11, wherein the thrust arm (104) is configured to act simultaneously on the opposing axial support ends (72,76) of the support pin (64). Stretching device for spinning machines (4). 11. The thrust arm (104) is configured to act on an intermediate shoulder (84) of the support pins (64) located between the opposing axial support ends (72, 76). Alternatively, a stretching device (4) for an air spinning machine having a plurality of supply ports according to 12. The stretching device (4) for an air spinning machine having a plurality of supply ports according to claim 11, 12 or 13, wherein the elastic thrust means (88) has a coil spring and / or a foil spring. The stretching device (4) for an air spinning machine having a plurality of supply ports according to claim 11, 12, 13 or 14, wherein the elastic thrust means (88) has a hydraulic and / or pneumatic actuator. The plurality of supplies according to any of the preceding claims, wherein the first and second separation drive rollers (40,44) are arranged directly opposed to each other at the output of the introduction element (8,12). Stretching device for air spinning machines with a mouth (4). The webs (N1, N2) are supplied according to the vertical supply direction (L), and the introduction elements (8, 12) are juxtaposed along the horizontal direction (Z) perpendicular to the vertical supply direction (L). The plurality of pieces according to any one of claims 1 to 16, wherein the separation driving rollers (32) are aligned with each other in parallel in the lateral direction (Z) and rotate around a lateral rotation axis in parallel with the lateral direction (Z). Stretching device for an air spinning machine having a supply port (4). The air spinning apparatus interweaves the webs (N1, N2) to obtain a single yarn (F) at the output from the air spinning chamber (20) at the input to the spinning chamber (20). The plurality of supply ports according to any one of claims 1 to 13, having the spinning chamber (20) having a plurality of air jets (not shown) oriented substantially tangent to the web. Stretching device for air spinning machines (4). − The step of preparing the stretching apparatus according to any one of claims 1 to 18.
-A stretching method for an air spinning machine having a plurality of supply ports including a step of stretching the web (N1, N2) using the stretching device (4). The stretching method according to claim 19, wherein the working load on each of the two webs is adjusted to a range of 12 to 18 kg.

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