JP2005272090A - Yarn feeder and yarn feeding method using this device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for feeding yarn capable of providing excellent durability, efficiently and continuously feeding all types of yarn lines of which thickness and contractibility vary with constant tension to a subsequent process. <P>SOLUTION: Tension of the yarn line 16 released from a yarn roller 14 by means of vertical winding is unwound at a short cycle before and behind the yarn line 16 during passing through a tension cushioning device. Yarn feeding speed is controlled so that variance in the tension at a long cycle detected by a tension detector 22 may meet the preset prescribed tension. Therefore, the yarn 16 can be fed to the subsequent process 18 with the constant tension all the time. Besides, a subsequent process monitor 26 is provided, therefore variance in the tension of the yarn 16 caused by operation/stop of the subsequent process 18 can be prevented, thus eliminating wasteful yarn 16 fed to the subsequent process 18 and wasteful energy consumption of the tension cushioning device 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a yarn feeding device and a yarn feeding method for stably taking out a yarn from a wound body of a fiber yarn, particularly preferably a spandex yarn wound body, and supplying the yarn to a post-processing step with a constant tension.

  Products using elastic yarns with an elongation of 100% or more such as spandex yarns are used in many product fields that require stretchability, such as clothing materials, industrial materials, and medical / hygiene materials. Is used.

  Many of these products use elastic yarns in the form of fabrics such as woven fabrics or knitted fabrics, or are used in the form of yarns as they are. When manufacturing such products, elastic yarns such as paper tubes and bobbins are used. Prepare the necessary number of wound yarns wound around the tube, that is, elastic yarn wound yarns, rotate the wound yarns at a predetermined speed, and supply elastic yarn with uniform unwinding tension using the ratio of yarn speed A positive feeding type (rolling-off type) yarn feeding device is used.

  In this positive feed type yarn feeder, elastic yarn can be supplied with uniform unwinding tension. For this purpose, the wound yarn body is always rotated with the yarn wound around the elastic yarn winding body. There must be. Therefore, when the yarn of the wound body is no longer consumed, it is necessary to stop the used device and replace it with a new elastic wound body to re-tie the yarn ends. For this reason, there has been a problem that the operating rate of the apparatus is lowered and the product yield is adversely affected.

  On the other hand, as a yarn feeding device that can be switched to a new wound body without stopping the device, a transfer tail yarn is provided at the innermost layer of the wound body, and this is used as the yarn end of the outermost layer of the new wound body. There is a warp removal method (depolarization feeding method) that supplies yarns continuously.

  With this warp removal type yarn feeding device, when the yarn wound around the wound body is consumed, it is possible to switch to a new thread body without stopping the device. It is possible to prevent a reduction in operating rate. However, in an elastic yarn wound body in which an elastic yarn having an elongation of 100% or more is wound as a wound body, the yarn is wound on the outer layer portion, the middle layer portion, and the inner layer portion of the wound yarn body due to the stretchability of the yarn. Since the degree of winding around the body is different, when a thread is supplied from such an elastic thread wound body using a vertical thread feeding device, a uniform unwinding tension is applied to each layer of the wound body. There was a problem that the yarn could not be supplied.

  In particular, in an elastic thread wound body in which an elastic thread is wound on a tube with a winding amount of 1 kg or more, it is known that the unwinding tension at each of the outer layer, the middle layer and the inner layer of the wound body is greatly different. When a flexible elastic yarn body is fed with a vertical yarn feeding device, the average value of the unwinding tension of the inner layer portion of the wound yarn and the average value of the unwinding tension of the outer layer portion are changed or fluctuated. growing. For this reason, the elastic yarn taken out from the wound body is in a state in which the yarn length and the thickness of the thread are greatly different depending on the take-out position in the wound body, and when supplied to the post-processing step in this state, There was a problem that the quality of products manufactured in the post-processing process could not be made uniform.

  As a technique that can solve the problems of such a conventional warp removing type yarn feeding device, it has a yarn tension sensor for adjusting the amount of yarn and a yarn feeding wheel, the yarn feeding wheel is driven by a step motor or the like, and By installing the yarn tension sensor between the winding body and the yarn feeding wheel, the yarn feeding device that supplies the yarn with a substantially constant tension, or the yarn feeding speed automatically according to the yarn feeding tension. A yarn feeding device that changes the yarn and feeds the yarn with a substantially uniform tension is known (for example, see Patent Document 1).

  However, in these yarn feeding devices, there are many cases where a yarn tension sensor having a delicate structure is provided to detect a slight difference in tension, and a thick tension of about 100 to 5,000 decitex using such a device is provided. When a large yarn is supplied, a large stress is applied to the yarn tension sensor, which causes a failure. In addition, when trouble occurs during yarn feeding and the yarn feeding device is suddenly stopped, the yarn between the wound yarn and the yarn feeding roll is pulled, resulting in the yarn tension exceeding normal. And the yarn tension sensor is damaged or deformed.

  In addition, as a technique for equalizing the tension of the elastic yarn supplied by the warp removing method without using the yarn tension sensor as described above, a plurality of small-diameter rollers and large-diameter rollers are provided, A cushioning member is provided on the circumference of the large-diameter roller and centered on the rotation center of the large-diameter roller, and at least one of the small-diameter rollers is rotatable. A technique is known in which the tension of the yarn is made uniform by winding and rotating a large-diameter roller in the running direction of the yarn (see, for example, Patent Document 2).

  According to this technique, the yarn unwound from the wound body is wound around the outer periphery of a plurality of small-diameter rollers, and while passing through the buffer member, between the adjacent small-diameter rollers due to the elasticity of the yarn itself. The tension of the yarns is averaged, and fluctuations in the unwinding tension when the yarn is unwound from the wound yarn can be reduced.

However, even in this technique, when an elastic yarn wound body is used in which the elastic yarn is wound with a winding amount of 1 kg or more and the average unwinding tension in each portion of the outer layer, the middle layer, and the inner layer is greatly different, Thus, the average unwinding tension greatly differing depending on the thread width could not be made uniform, and therefore the tension of the yarn supplied to the post-processing step could not always be maintained at a constant level regardless of the part of the wound body.
JP 11-314840 A (pages 2-6) JP 2002-60136 A (page 2-9)

  Therefore, the main problem of the present invention is that it is highly durable and can supply all types of yarns having different thicknesses and stretchability continuously and uniformly to the post-processing step with uniform tension. It is to provide a yarn device and a yarn feeding method.

  According to the first aspect of the present invention, “a yarn feeding device (10) which takes out the yarn (16) from the wound body (14) by a warp removing method and supplies the yarn (16) to the post-processing step (18). ), A yarn take-out means for unwinding and taking out the yarn (16) from the wound body (14), a tension buffering means for buffering the tension of the taken-out yarn (16), and a tension buffering means. Tension detection means (22) that is arranged downstream and detects the tension of the yarn (16) supplied to the post-processing step (18), and the tension detected by the tension detection means (22) is preset. The yarn feeding device (10) is characterized by comprising a tension control means (24) for controlling the yarn take-out speed of the yarn take-out means so as to coincide with a predetermined tension.

  The invention described in claim 5 relates to a yarn feeding method that can be executed by the yarn feeding device (10) according to claim 1, "from the wound body (14) to the yarn (16) in a warp removing system." Is a yarn feeding method for supplying the yarn (16) to the post-processing step (18), unwinding and removing the yarn (16) from the wound yarn body (14), and removing the removed yarn (16 ) Before and after a short period of time, and after that, the tension of the yarn (16) is detected, and the yarn (16) is adjusted so that the detected tension matches a predetermined tension set in advance. ) Is controlled.

  In these inventions, the yarn (16) that has been unwound and pulled out from the wound body (14) by the vertical take-off method by the yarn take-out means is the front and rear yarns (16 ) Tension is buffered and averaged. That is, it is possible to reduce fluctuations in the unwinding tension in a short cycle given when the yarn (16) is unwound from the wound body (14).

  And the fluctuation of the unwinding tension in a short cycle is made uniform, and the tension fluctuation in the long cycle is detected by the tension detecting means (22) of the yarn (16) supplied to the post-processing step (18). At the same time, the fluctuation in tension detected by the tension detecting means (22) is suppressed, and the yarn taking-out speed of the yarn taking-out means is controlled by the tension control means (24) so as to coincide with a preset predetermined tension.

  For this reason, an elastic yarn having an elongation exceeding 100% is wound as the wound yarn (14), and the average yarn unwinding tension at each of the outer layer, the middle layer and the inner layer is greatly different. However, by adjusting the yarn take-off speed of the yarn take-out means, it is possible to make the average unwinding tension greatly different in each part of the wound body (14) uniform, and always keep the yarn (16) constant. It can be supplied to the post-processing step (18) by tension.

  In addition, since the tension detecting means (22) is arranged on the downstream side of the tension buffering means, even if the post-processing step (18) is suddenly stopped due to trouble or the like, a large tension is applied to the tension detecting means (22). There is no such concern, and the tension detecting means (22) can be prevented from being damaged or deformed.

  Furthermore, the tension detection means (22) only needs to be able to detect a change in tension in a long cycle for the yarn (16) in which the fluctuation in unwinding tension in a short cycle is uniform. An inexpensive one with low responsiveness can be used.

  According to a second aspect of the present invention, in the yarn feeding device (10) according to the first aspect, the “post-processing step monitoring means (26) for monitoring and detecting the operation or stop state of the post-processing step (18) is provided. In addition, the operation or stop state of the post-processing step (18) detected by the post-processing step monitoring means (26) is synchronized with the operation or stop state of the yarn take-out means. '' Is.

  In this invention, since the operation status of the post-processing step (18) monitored and detected by the post-processing step monitoring means (26) is synchronized with the operation status of the yarn take-out means, the post-processing step due to troubles and the like When (18) suddenly stops, the operation of the yarn take-out means is immediately stopped, and when the operation of the post-processing step (18) is resumed, the operation of the yarn take-out means is immediately resumed. The

  For this reason, it is possible to prevent fluctuations in the tension of the yarn (16) supplied from the yarn feeder (10) to the post-processing step (18) due to operation / stop of the post-processing step (18). When the post-processing step (18) is stopped, the waste yarn (16) can be prevented from being supplied toward the step (18), and the waste energy consumed by the yarn take-out means can be eliminated. be able to. That is, the yarn feeder (10) and the equipment for the post-processing step (18) can be integratedly managed.

  According to a third aspect of the present invention, there is provided the yarn feeding device (10) according to the first or second aspect, wherein the tension buffering means comprises one or a plurality of small diameter rollers (34) and a large diameter roller (32). The small-diameter roller (34) is disposed on the circumference around the rotation center of the large-diameter roller on the side surface of the large-diameter roller (32), and at least one of the small-diameter rollers (34) is rotatable. '' To do.

  In the present invention showing one specific embodiment of the tension buffering means, the small-diameter roller (34) attached rotatably is rotated by friction when the yarn (16) is wound around. Therefore, the thread (16) unwound from the wound body (14) is wound around the outer periphery of the small-diameter roller (34) and the large-diameter roller (32) is rotated toward the traveling direction of the thread (16). Then, the tension between the adjacent small diameter rollers (34) is averaged by the elasticity of the yarn (16) itself, and the yarn (16) is short before and after the yarn (16) while passing through the tension buffering means. Variations in unwinding tension with period can be reduced.

  According to a fourth aspect of the present invention, in the yarn feeding device (10) according to the third aspect of the present invention, "a plurality of rollers (50) in which at least one of the small diameter rollers (34) is coaxial with each other and can be rotated independently". It is divided into (52), (54) and (56) '', whereby the wound yarns (14) with different thicknesses and winding amounts of the wound yarns (16) are obtained. Even when unwinding at the same time and supplying the unwound yarns (16) to the yarn feeding device (10) in parallel, each yarn (16) is connected to a plurality of rollers (50) (52). , (54), (56), and the plurality of rollers (50), (52), (54), (56) divided by being wound around the outer periphery of each other are mutually connected according to the unwinding tension of each yarn (16). Since it rotates independently, it becomes possible to average the unwinding tension difference between each thread (16), regardless of the winding amount of the wound body (14) and the thickness of the thread (16). In parallel, it is possible to make the tension of the yarn (16) supplied to the post-processing step (18) uniform. it can.

  According to the invention described in claim 1 or 5, the yarn unwound from the wound body by the vertical removing method averages the tension of the front and rear yarns while passing through the tension buffering means, The yarn take-out speed of the tension buffering means is controlled so that the tension detected by the detecting means coincides with a predetermined tension set in advance. Therefore, the average unwinding tension greatly different in each part of the wound body can be made uniform, and the yarn can always be supplied to the post-processing step with a constant tension.

  Further, even when the post-processing step is suddenly stopped, there is no fear that a large tension is applied to the tension detecting means, and it is possible to prevent the tension detecting means from being damaged or deformed.

  Furthermore, an inexpensive and low-responsive device can be used as the tension detecting means, and as a result, the durability of the tension detecting means can be improved.

  According to invention of Claim 2, it can prevent that the tension | tensile_strength of the thread | yarn supplied from a yarn feeder to a post-processing process resulting from the driving | operation stop of a post-processing process can be prevented, and a post-processing process stops In this case, it is possible to eliminate wasteful yarn consumed by the process and wasteful energy consumed by the tension buffering means.

  According to the invention described in claim 3, the tension between the adjacent small-diameter rollers is averaged by the elasticity of the yarn itself, and fluctuations in the unwinding tension before and after the yarn while the yarn passes through the tension buffering means. Can be reduced.

  According to the invention described in claim 4, even when each yarn unwound from a plurality of wound bodies is supplied to the yarn feeding device in parallel, each of the plurality of rollers into which each yarn is divided is divided. Since the plurality of divided rollers rotate independently of each other according to the unwinding tension of each yarn by winding around each outer periphery, it is possible to average the unwinding tension difference between each yarn. It becomes possible, and the tension of the yarn supplied to the post-processing step in parallel can be made uniform regardless of the winding amount of the wound body and the thickness of the yarn.

  Accordingly, there is provided a yarn feeding device and a yarn feeding method that are highly durable and can continuously supply all types of yarns having different thicknesses and stretchability to the post-processing step continuously with uniform tension. can do.

  The present invention will be described below with reference to the illustrated embodiments. The yarn feeding device (10) of the present invention shown in FIG. 1 unwinds the yarn (16) from the wound yarn body (14) suspended on the stand (12) by a vertical removing method, and then unwinds the yarn (16 ) Is supplied to the post-processing step (18) with a predetermined tension. Generally, the rotating device (20), the tension detecting means (22), the tension control means (24) and the post-processing step monitoring means ( 26) etc.

  In this embodiment, as a post-processing step (18), medical and sanitary materials such as paper diapers are interposed between the film (F) and the nonwoven fabric (N) with a thread (16) made of elastic yarn. Lines to be manufactured, etc. are mentioned, but the post-processing step (18) is not limited to this, and between the nonwoven fabric (N) and the nonwoven fabric (N), or between the film (F) and the film (F). Even if it is a line that manufactures medical and sanitary materials by interposing yarns (16) made of elastic yarn, a line that manufactures clothing materials or industrial materials composed of looms and knitting machines, etc. Good.

The rotating device (20) unwinds and takes out the yarn (16) wound around the wound body (14) [yarn take-out means], and buffers the unwinding tension of the yarn (16). It is for averaging [tension buffering means], and is composed of a tension buffering device (28), a motor (30), etc., which are integrally attached to the base (20a). (In this embodiment, as in the parentheses described above, the rotating device (20) functions as a “yarn take-out means” and a “tension buffering means”.)
The tension buffer (28) is made of a metal material such as carbon steel, stainless steel, or titanium, synthetic resin, ceramic, or the like, and has a large-diameter roller (32) that is rotationally driven. A small-diameter roller (34) made of the same material as the large-diameter roller (32) is disposed on one side surface (surface) of the large-diameter roller (32). One or more [eight in the case of this embodiment] are provided so that the rotation shaft of the large-diameter roller (32) and the shaft of the small-diameter roller (34) are substantially parallel to each other. The other side surface (back surface) of the large-diameter roller (32) is connected to a motor (30) via a gear or a belt (not shown) and has a drive shaft (36) that rotates the large-diameter roller (32). It is attached (see FIG. 2).

  Here, the small-diameter roller (34) provided on the side surface of the large-diameter roller (32) is one on which the yarn (16) taken out from the wound yarn body (14) is wound, at least one of which is It is rotatably mounted via a ball bearing (38) or the like.

  The ratio of the diameter of the small diameter roller (34) to the diameter of the large diameter roller (32) is preferably 0.01 or more and 0.45 or less, and the axial length of the small diameter roller (34) is In consideration of the physical properties of the yarn (16) and the like, the yarn (16) is appropriately set so as to be easily set.

  From the viewpoint of preventing yarn breakage, the surface of the small-diameter roller (34) is preferably provided with a circumferential groove (not shown) so that the wound yarns (16) do not overlap each other. In order to prevent the small-diameter roller (34) from being worn by the friction with the yarn, it is preferable to apply an anti-abrasion treatment to the portion in contact with the yarn (16). As an example of this abrasion resistance treatment, a plurality of axially extending grooves (serrations) are provided on the side peripheral surface of the small diameter roller (34), and the friction between the small diameter roller (34) and the yarn (16) is provided. Is reduced.

  The motor (30) includes a drive unit (30a) that rotates and drives the drive shaft (36) of the large-diameter roller (32), and a control circuit such as an inverter. And a control unit (30b) for controlling the rotational speed of the drive unit (30a) based on a signal given from the monitoring means (26) or the like.

  The rotating device (20) configured as described above is connected to a power source (not shown) and is installed on the downstream side of the wound body (14) suspended from the stand (12). Further, a balloon convergence guide (40) for converging a balloon generated when the yarn (16) is unwound from the wound body (14) is provided between the rotating device (20) and the wound body (14). ) And thread breakage detector (42).

  The tension detecting means (22) is arranged downstream of the rotating device (20), and the tension of the yarn (16) supplied to the post-processing step (18) via the rotating device (20) and the fluctuation thereof. The guide roll (44) for guiding the yarn (16) that has passed through the rotating device (20) and the tension of the yarn (16) guided by this guide roll (44) It comprises a sensing unit (46) for sensing. The tension data of the yarn (16) detected by the tension detection means (22) is sequentially sent to the tension control means (24) via the wiring (L1).

  Here, the yarn (16) given to the tension detecting means (22) is averaged by the rotating device (20) to suppress fluctuations in the unwinding tension before and after the yarn (16), that is, fluctuations in tension in a short cycle. Has been. Therefore, it is sufficient that the tension detecting means (22) can detect a change in tension that changes in a long cycle, such as when the average unwinding tension differs in each part of the outer layer, the middle layer, and the inner layer of the wound body (14). Therefore, an inexpensive and low-responsive device can be used as the tension detecting means (22).

  The tension control means (24) compares the tension (detected tension) detected by the tension detecting means (22) with a predetermined tension (set tension) set in advance and there is a difference between them. In this case, in order to make the detected tension coincide with the set tension, a signal is given to the control unit (30b) of the motor (30) via the wiring (L2), and the rotation device (30) is adjusted by adjusting the rotation speed of the motor (30). 20) Controls the yarn take-out speed, and is constituted by a microcomputer or the like.

  The tension control means (24) controls the tension of the yarn (16) [specifically, the yarn take-out speed of the rotating device (20)] from one wound body (14). The time required for completely unwinding the yarn (16) is divided at a predetermined time interval, and the detected tension and the set tension are compared at a predetermined point in the divided time interval, and the rotation of the motor (30) is performed. The tension control means (24) may be set so as to adjust the number.

  The number of divisions is preferably about 2 to 50, but is particularly preferably about 3 to 20 in consideration of the durability and control accuracy of the apparatus. Further, the time interval at this time is preferably set to several minutes to several tens of minutes, but these settings are the average unwinding tension of the wound body (14) and the wound body (14). It should be changed as appropriate according to the amount of winding, and is not limited to the above setting. Of course, it goes without saying that the tension control means (24) may be set so as to always perform sequential control on all the tensions detected by the tension detection means (22), regardless of the setting method described above.

  The post-processing process monitoring means (26) is connected to the detection unit (26a) via the wiring (L3) and the detection unit (26a) for monitoring and detecting the operation / stop status of the equipment in the post-processing process (18). In order to synchronize the operation status of the post-processing step (18) detected by the detection unit (26a) and the operation status of the rotating device (20), the control unit of the motor (30) via the wiring (L4) And an operation control unit (26b) for giving a predetermined signal to (30b).

  Next, when supplying the yarn to the post-processing step (18) using the yarn feeding device (10) of the present invention, first, the power of the yarn feeding device (10) is turned on, and the warp removing method The thread (16) is pulled out from the wound body (14) suspended on the stand (12) at the position, passed through the balloon convergence guide (40) and the thread breakage detector (42), and then rotated (20 ). Specifically, the yarn (16) pulled out from the wound body (14) is placed on the small diameter roller (34) so that the yarn (16) contacts all the small diameter rollers (34) of the tension buffer (28). (See FIGS. 1 and 2). At this time, care should be taken that the yarns (16) wound around the small-diameter roller (34) do not overlap each other.

  Here, as described in the background art, the warp removing method is provided with a transfer tail yarn in the innermost layer portion of the wound body (14), and this is used as the yarn end of the outermost layer portion of the new wound body (14). This is a yarn feeding method in which the yarn is continuously fed by being tied to the yarn and can be switched to a new wound body without stopping the apparatus.

  Further, the yarn (16) fed by the yarn feeding device (10) of the present invention may be any of natural fiber, semi-synthetic fiber, synthetic fiber, etc., but synthetic fiber having stretchability is particularly preferable. . Examples of such synthetic fibers having elasticity, that is, elastic yarns, include polyurethane elastic yarns having rubber elasticity. Even if the elastic yarns are left as they are, the processed yarns covered with other inelastic yarns are also exemplified. It may be in a state. And it is especially preferable that this elastic yarn has a unique property with an elongation of 100% or more.

  Subsequently, the yarn (16) set on the rotating device (20) is further stretched and sequentially passed through the guide roll (44) and the detecting section (46) of the tension detecting means (22), and then inserted into the guide (48). Then, it is stretched toward the post-processing step (18). Thereby, the preparation for supplying yarn to the post-processing step (18) is completed.

  Then, after inputting a predetermined set tension value to the tension control means (24), the motor (30) is started and the large diameter roller (32) of the tension buffer (28) is moved in the running direction of the yarn (16). And the post-processing step (18) is operated with the yarn (16) interposed between the film (F) and the non-woven fabric (N) in the post-processing step (18). Then, the yarn (16) is always supplied with a constant tension toward the post-processing step (18).

  According to this embodiment, the small-diameter roller (34) rotatably attached rotates by friction with the wound yarn (16). Therefore, the yarn (16) unwound from the wound body (14) and wound around the outer periphery of the small-diameter roller (34) by the vertical removing method is tension between the adjacent small-diameter rollers (34) by its own elasticity. Are averaged, and fluctuations in unwinding tension in a short period before and after the yarn (16) can be reduced while passing through the rotating device (20).

  In addition, the fluctuation of the unwinding tension in a short cycle is reduced, and the yarn (16) supplied to the post-processing step (18) is detected by the tension detection means (22) in a long cycle, This tension fluctuation detected by the tension detecting means (22) is suppressed, and the yarn take-out speed of the rotating device (20) is controlled by the tension control means (24) so as to coincide with a preset predetermined tension. For this reason, an elastic yarn having an elongation exceeding 100% is wound as the wound yarn (14), and the average yarn unwinding tension at each of the outer layer, the middle layer and the inner layer is greatly different. However, by adjusting the yarn take-off speed of the rotating device (20), it is possible to equalize the average unwinding tension greatly different in each part of the wound body (14), and the yarn (16) is always constant. It can be supplied to the post-processing step (18) with a tension of.

  Furthermore, since the tension detection means (22) is arranged downstream of the rotating device (20), even if the post-processing step (18) stops suddenly due to trouble, etc., the tension detection means (22) is detected. There is no concern that a large tension is applied to the portion (46), and the tension detecting means (22) can be prevented from being damaged or deformed.

  Since the operation status of the post-processing step (18) monitored and detected by the post-processing step monitoring means (26) is synchronized with the operation status of the rotating device (20), the post-processing step ( When 18) suddenly stops, the operation of the motor (30) is immediately stopped, and when the post-processing step (18) is resumed, the operation of the motor (30) is also resumed immediately. . For this reason, it is possible to prevent fluctuations in the tension of the yarn (16) supplied from the yarn feeder (10) to the post-processing step (18) due to operation / stop of the post-processing step (18). In addition, when the post-processing step (18) is stopped, it is possible to prevent the useless yarn (16) from being supplied toward the step (18), and the motor (30) when the post-processing step (18) is stopped. Can eliminate wasted energy. That is, the yarn feeder (10) and the equipment for the post-processing step (18) can be integratedly managed.

  In the above-described embodiment, when the rotating device (20) functions as the “yarn takeout means” and the “tension buffering means”, that is, the “yarn takeout means” and the “tension buffering means” are integrated. As shown, the “yarn take-out means” and the “tension buffering means” may be configured separately.

  The tension buffering device (28) [that is, a part of the tension buffering means] includes one or a plurality of small-diameter rollers (34) and a large-diameter roller (32), and the small-diameter roller (34) is a large-diameter roller ( 32) The side surface of the large-diameter roller is arranged on the circumference of the center and at least one of the small-diameter rollers (34) is rotatable. As shown in FIG. At least one of (34) may be divided into a plurality of rollers (50) and (52) that are coaxial and mutually rotatable. Furthermore, as shown in FIG. 4, the divided small-diameter roller (34) may be constituted by coaxial rollers (54) and (56) having different diameters.

  When the tension buffer device (28) having such a configuration is used, the wound yarns (14) having different thicknesses and winding amounts of the wound yarn (16) are simultaneously unwound and each unwound yarn (16 ) Are fed around the respective outer circumferences of the rollers (50) (52), (54) (56) even when supplying the yarn feeding device (10) in parallel. Accordingly, the plurality of divided rollers (50), (52), (54) and (56) rotate independently of each other according to the unwinding tension of each yarn (16). It is possible to average the unwinding tension difference between them and supply them to the post-processing step (18) in parallel regardless of the winding amount of the wound yarn body (14) and the thickness of the yarn (16). The tension of the yarn (16) can be made uniform.

  Further, as shown in FIGS. 3 and 4, two small diameter rollers (32) may be used to support the small diameter roller (34) from both sides. Thus, by supporting the small-diameter roller (34) from both sides by the two large-diameter rollers (32), the rigidity of the tension buffer (28) can be improved and the small-diameter roller (34) is wound around. It is possible to prevent the yarn (16) from being unnaturally twisted.

  In the above-described embodiment, an example is shown in which one guide roll (44) is provided in the upstream portion of the tension detecting means (22), but the guide provided in the upstream portion of the tension detecting means (22) is a rotating device ( The yarn (16) that has passed through 20) is not particularly limited as long as it can be guided so as to be smoothly introduced into the detection unit (46) without being entangled. It may be a guide or a movable guide.

It is the schematic which shows the yarn feeder of one Example of this invention. It is a perspective view which shows the principal part of the tension buffer means of one Example in this invention. It is a perspective view which shows the principal part of the tension buffer means of the other Example in this invention. It is a perspective view which shows the principal part of the tension buffer means of the other Example in this invention.

Explanation of symbols

(10) ... Yarn feeder
(12)… Stand
(14)… Wind-up body
(16) ... Yarn
(18)… Post-processing process
(20)… Rotating device
(22) ... Tension detection means
(24) ... Tension control means
(26)… Post-processing process monitoring means
(26a) ... Detector
(26b)… Operation control unit
(28) ... Tension buffer
(30)… Motor
(30a) ... Drive unit
(30b)… Control unit
(32)… Large diameter roller
(34)… Small diameter roller
(36)… Drive shaft
(38)… Ball bearing
(40)… Balloon convergence guide
(42) ... Thread break detector
(44)… Guide roll
(46)… Detection unit
(48)… Guide
(50), (52), (54), (56) ... Roller
(L1) (L2) (L3) (L4) ... Wiring

Claims (5)

A yarn feeding device that takes out the yarn from the wound body by a vertical removal method and supplies the yarn to the post-processing step,
Thread take-out means for unwinding and taking out the yarn from the wound thread body;
Tension buffering means for buffering the tension of the taken-out yarn,
A tension detecting means disposed downstream of the tension buffering means for detecting the tension of the yarn supplied to a post-processing step;
And a tension control means for controlling the yarn take-out speed of the yarn take-out means so that the tension detected by the tension detecting means coincides with a predetermined tension set in advance. Yarn device.   Post-processing step monitoring means for monitoring and detecting the operation or stop state of the post-processing step is further provided, the post-processing step operation or stop state detected by the post-processing step monitoring means, and the yarn take-out The yarn feeding device according to claim 1, wherein the yarn feeding device is synchronized with a state of operation or stop of the means.   The tension buffering means includes one or a plurality of small-diameter rollers and a large-diameter roller, and the small-diameter roller is disposed on a circumference centering on a large-diameter roller rotation center on the side of the large-diameter roller, and the small-diameter roller 3. The yarn feeding device according to claim 1, wherein at least one of the yarn feeding devices is rotatable.   The yarn feeding device according to claim 3, wherein at least one of the small-diameter rollers is divided into a plurality of rollers that are coaxial with each other and that can rotate independently. A yarn feeding method in which a yarn is taken out from a wound body by a warp removing method and supplied to a post-processing step,
Unwinding and taking out the yarn from the wound body,
Buffer fluctuations in tension in a short cycle before and after the taken-out yarn,
Thereafter, the yarn tension is detected, and the yarn take-out speed is controlled so that the detected tension matches a predetermined tension set in advance.

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