WO2008001869A1

WO2008001869A1 - Yarn splicing method and yarn splicing device

Info

Publication number: WO2008001869A1
Application number: PCT/JP2007/063047
Authority: WO
Inventors: Reiji Arikita; Kenji Nakai; Yasunori Hatakeyama
Original assignee: Shima Seiki Manufacturing Limited; Murata Machinery, Ltd.
Priority date: 2006-06-30
Filing date: 2007-06-28
Publication date: 2008-01-03
Also published as: CN101501255A; KR101331016B1; KR20090028573A; EP2042625B1; JPWO2008001869A1; EP2042625A1; JP4979699B2; EP2042625A4; CN101501255B; ATE554208T1

Abstract

A yarn splicing method in which a yarn lint treatment step for fabric that is knitted with spun yarns obtained by yarn splicing can be eliminated with sufficient strength of the spun yarns maintained. Two knitting yarns (21, 22) are disposed with their end parts (21a, 22a) superposed over each other while being oriented in the same direction, and the yarns are twisted around each other to form a projecting part (23) and branched parts (51, 52) branched from the projecting part (23). The projecting part (23) is superposed over and along one branched part (51) and fixed to it.

Description

Yarn splicing method and yarn splicing device

Technical field

[0001] The present invention relates to a yarn splicing method and a splicing device for splicing a plurality of spun yarns.

Background art

[0002] A spun yarn used for knitting a knitted fabric may be broken during knitting when excessive tension is applied. In such a case, the spun yarn and the new spun yarn are spliced and knitting is resumed. Yarn splicing is also performed when knitting a knitted fabric having an intarsia pattern with a knitting yarn, which is a kind of spun yarn that is used only for repairing a cut spun yarn (see, for example, JP-A-6-2250) ).

In the first prior art yarn splicing method, the ends of two spun yarns are tied by a knotter device to form a knot, and the two spun yarns are spliced. In this case, the end portion of each spun yarn protrudes from the knot. The portion on the tip side of each spun yarn can be cut and shortened after the knot is formed, but it cannot be completely eliminated.

The second prior art yarn splicing method is a method of splicing spun yarn without forming a knot by a splicer device. In this splicing method, the ends of the two spun yarns are arranged so as to face each other in the opposite direction, and the compressed air is blown so that the ends of the two spun yarns are intertwined and spliced. To do. By this yarn splicing method, the spliced region of spun yarn is formed into an “I” shape in appearance (see, for example, Japanese Patent Publication No. 60-39767). FIG. 13 is a diagram showing a spun yarn obtained by the third conventional piecing method. The third conventional splicing method is to arrange the end portions la and 2a of the spun yarns 1 and 2 so as to overlap each other in the same direction and blow the compressed air to blow the end portions of the spun yarns 1 and 2. La, 2a are intertwined to form intertwined part 4 and spliced. By this yarn splicing method, the spliced region 3 of the spun yarns 1 and 2 is formed in a “T” shape in appearance (see, for example, JP-A-2004-27463).

In the first conventional yarn splicing method, the knot formed on the spun yarn spliced has a diameter several times the outer diameter of the spun yarn. Therefore, if this knot comes out on the front side of the knitted fabric, the appearance of the knitted fabric is damaged. In order not to damage the appearance, the knot is placed inside the knitted fabric A whisker treatment process is required.

In the second conventional yarn splicing method, two spun yarns are overlapped and entangled in opposite directions, so that the non-overlapped portions of the two spun yarns are further twisted, In some cases, the radial force S decreases, and the strength of the obtained spun yarn is insufficient. Therefore, the spun yarn that can be spliced is limited. For example, when a spun yarn having a double yarn and an optical fiber strength is used as a yarn to be spliced, the spliced yarn may break during the knitting.

In the third prior art yarn splicing method, the spliced yarn splicing region 3 is arranged in a “T” shape, so that the intertwined portion 4 where the ends la and lb of the yarns 1 and 2 are intertwined is Projects outward with respect to the remainder of the joint area 3. If the entangled portion 4 comes out on the surface side of the knitted fabric, the appearance of the knitted fabric is impaired. In order not to impair the appearance, in order to arrange the entangled portion 4 on the back side of the knitted fabric, a whisker treatment step for inserting the entangled portion 4 inside the knitted fabric is required. Such a problem similarly occurs when the spun yarn spliced for knitting is used not only for knitting a knitted fabric but also for weaving a woven fabric.

Disclosure of the invention

An object of the present invention is to provide a yarn splicing method and a splicing device capable of omitting the beard treatment step after splicing while ensuring the strength of the spun yarn obtained by the splicing.

The present invention is a yarn splicing method for splicing the ends of a plurality of spun yarns,

A plurality of spun yarns are connected to each other, and the leading end portion force of the plurality of spun yarns is connected to each other with a separation portion that is separated in the direction toward the base end portion, and from the connecting portion to the leading end portion of each spun yarn A spun yarn connecting step of forming, on each spun yarn, extending protrusions and a plurality of branch portions respectively extending from the connecting portion toward the base ends of the plurality of spun yarns;

A protruding portion fixing step for fixing the protruding portion and the branched portion superimposed on the protruding portion by overlapping the protruding portion along at least one of the plurality of branched portions; This is a yarn splicing method characterized by the following.

In the present invention, the branch portion to which the projection portion is fixed in the projection portion fixing step is a branch portion arranged on the upstream side in the yarn feeding direction in which each spun yarn is fed and conveyed with respect to the connecting portion. It is preferable that

In the present invention, in the protrusion fixing step, after the protrusion and the branch part are partially untwisted, the untwisted portions are entangled with each other to fix the protrusion to the branch part. Is preferred.

In the present invention, it is preferable that in the protrusion fixing step, the protrusion is turned around the axis of the branch portion, the protrusion is wound around the branch portion, and the protrusion is fixed to the branch portion.

In the present invention, in the protrusion fixing step, it is preferable that the protrusion is wound around the branch part while preventing the branch part from co-rotating with the protrusion.

Further, in the present invention, in the protrusion fixing step, it is preferable to fix the protrusion and the branch portion by spraying a compressed fluid in a direction in which the protrusion is directed toward the branch portion to be fixed. .

Further, in the present invention, in the spun yarn connecting step, depending on whether there is a difference between a method in which a plurality of spun yarns are entangled and connected and a method in which a plurality of spun yarns are combined and connected.

It is preferable to connect the separated parts of multiple spun yarns together.

Further, the present invention is a spun yarn that is spliced by the splicing method.

Further, the present invention is a knitted fabric knitted with the knitting yarn spliced by the splicing method.

The present invention is also a yarn splicing device for joining the ends of a plurality of spun yarns, wherein the spun yarns are connected to each other in a direction toward the proximal end portion of the plurality of spun yarns. A connecting portion in which the spaced apart spaced portions are connected to each other; a protrusion extending from the connecting portion to the tip of each spun yarn; and a plurality of branch portions extending from the connecting portion toward the base ends of the plurality of spun yarns. A spun yarn connecting means for forming a spun yarn on each spun yarn;

A protrusion fixing means for fixing the protrusion and the branch overlapped with the protrusion by overlapping the protrusion along at least one of the plurality of branches; This is a yarn splicing device.

In the present invention, it is preferable that the protruding portion fixing means fixes the protruding portion to a branch portion arranged on the upstream side in the yarn feeding direction in which each spun yarn is fed and conveyed with respect to the connecting portion. Further, in the present invention, the protrusion fixing means may be an entanglement method in which the protrusion and the branch part are partially untwisted, and then the untwisted parts are entangled with each other, or the protrusions around the axis of the branch part. It is preferable to fix the protruding portion and the branching portion by any one of the brazing methods in which the protruding portion is wound around the branching portion.

In the present invention, the spun yarn connecting means preferably connects the separated portions of the plurality of spun yarns to each other using a method of entwining or connecting a plurality of spun yarns.

In the present invention, the spun yarn connecting means includes a first splice head that blows a compressed fluid onto a portion where a plurality of spun yarns are overlapped to connect the spun yarns, and the protruding portion fixing means includes Preferably, it includes a second splice head for spraying a compressed fluid onto the protrusion and fixing the protrusion and the branch.

Brief Description of Drawings

Objects, features and advantages of the present invention will become more apparent from the following detailed description and drawings.

1A to 1D are front views of a knitting yarn for illustrating a procedure of a yarn splicing method according to a first embodiment of the present invention.

FIG. 2 is a view showing a flat knitting machine 31 provided with a yarn splicing device 30.

FIG. 3 is an enlarged perspective view showing the splice heads 33 and 34 included in the yarn splicing device 30 in an enlarged manner.

FIG. 4 is a flowchart showing the procedure of the protrusion fixing process of the yarn splicing device 30. FIG. 5 is a flowchart showing the procedure of the protrusion fixing process.

6A to 6D are diagrams illustrating the operation of the yarn splicing device 30 in each step of the protrusion fixing process.

7A and 7B are perspective views showing the second splice head 34 for explaining the yarn splicing method according to the second embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along the line S8—S8 in FIG. 7A.

FIG. 9 is a cross-sectional view taken along the line S9—S9 in FIG.

10A and 10B show a yarn joining device 30A that realizes the yarn joining method of the second embodiment. FIG.

FIG. 11 is a front view showing the knitting yarn 24B connected in the spun yarn connecting step according to the third embodiment of the present invention.

12A to 12D are front views respectively showing a state in which the protrusions 23a and 23b are fixed.

FIG. 13 is a diagram showing a spun yarn obtained by the third conventional piecing method.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1A to 1D are front views of a knitting yarn for illustrating the procedure of the yarn splicing method according to the first embodiment of the present invention. The splicing procedure proceeds in the order of Fig. 1A to Fig. 1D. The splicing method is a method for splicing two knitting yarns 21 and 22. The piecing method is used, for example, when knitting yarns of a different color from the knitting yarn being knitted are spliced to the knitting yarn being knitted. The splicing method is also used when a new knitting yarn is spliced to a broken knitting yarn. In the present embodiment, a method for joining two knitting yarns 21 and 22 will be described.

In the yarn splicing method according to the first embodiment of the present invention, first, two knitting yarns 21 and 2 2 that are spun yarns are prepared (FIG. 1A). Next, the tip portions 21a and 22a of the knitting yarns 21 and 22 are arranged so as to overlap in the same direction. In the present invention, “directing in the same direction” means “directing the end surfaces of the tip portions 21a, 22a of the knitting yarns 21, 22 in the same direction”. The respective knitting yarns 21 and 22 are provided with separation portions 21c and 22c at positions that are separated by a predetermined protrusion amount HI in the direction of force from the leading end portions 21a and 22a to the base end portions 21d and 22d. In a state where the knitting yarns 21 and 22 are overlapped, at least the knitting yarns 21 and 22 are at the tip overlapping portions 21e and 22e that are the portions from the tip portions 21a and 22a to the separating portions 21c and 22c, and in the same direction. (Figure IB)

) o

After overlapping and arranging, the tip overlapping portions 21e and 22e of the two knitting yarns 21 and 22 are untwisted. Next, the untwisted tip overlapping portions 21e and 22e are entangled with each other to integrally connect the tip overlapping portions 21e and 22e of the two knitting yarns 21 and 22 (FIG. 1C). As a result, the connected knitting yarn 24 in which the two knitting yarns 21, 22 are connected to each other is formed. The connected knitting yarns 24 are connected to each other at the spacing portions 21c, 22c of the respective knitting yarns 21, 22 before connection. And a projecting portion 23 extending from the connecting portion 50 to the tip portions 21a, 22a of the respective knitting yarns 21, 22 before connection, and a directing force from the connecting portion 50 to the base ends 21d, 22d of the knitting yarns 21, 22 before connection. Thus, two branch portions 51 and 52 extending respectively are formed. The branch portions 51 and 52 correspond to the remaining portions excluding the overlapping portions 21e and 21b of the knitting yarns 21 and 22 before splicing. Further, the branch portions 51 and 52 branch into two branches starting from the connecting portion 50. The process of connecting the two knitting yarns 21, 22 at the leading end overlapping portions 21e, 22e to form the knitted yarn 24 after the connection corresponds to the spun yarn connecting process.

Next, the projecting portion 23 is bent, and the projecting portion 23 is disposed so as to overlap along one of the two branch portions 51 and 52. In this state, the part where the protrusion 23 and the one branch part 51 overlap is partially untwisted. Next, the untwisted portions are entangled with each other, and the protruding portion 23 is overlapped and fixed along one branch portion 51. (Figure 1D). In this way, the process of arranging and fixing the protrusion 23 to at least one branch 51 corresponds to the protrusion fixing process. After the spliced knitting yarn 25, the tip 23a of the protrusion 23 is fixed to the branch 51, so the protrusion H2 that the protrusion 23 protrudes from the branch 51 is projected. The protrusion amount before fixing can be reduced compared to HI (H2 <H1). For example, the protrusion amount HI before fixing the protrusion is 15 mm, while the protrusion amount H2 after fixing the protrusion is lm m. However, the protrusion amounts HI and H2 described above are merely examples, and vary greatly depending on the splicing conditions such as the type of spun yarn, the number of spliced yarns, and the amount of compressed air sprayed.

FIG. 2 is a view showing a flat knitting machine 31 including a yarn splicing device 30 according to an embodiment of the present invention. FIG. 3 is an oblique view showing the splice heads 33 and 34 included in the yarn splicing device 30 in an enlarged manner. Regarding Fig. 3, the vertical direction means the vertical direction toward the page. The downward direction is the direction from the upstream side in the yarn feeding direction to the downstream side in the yarn feeding direction. The above-described yarn joining method is achieved by the yarn joining device 30 according to the present embodiment. The yarn splicing device 30 is an air splicer device and is provided in a flat knitting machine 31 for knitting a knitted fabric. In the present embodiment, the two knitting yarns are the knitting yarn being used for knitting and the other knitting yarn to be spliced to the knitting yarn being used. The other knitting yarn is appropriately selected from a plurality of knitting yarns.

The yarn splicing device 30 has a first splice head 33 and a second splice head 34. Each splice head 33, 34 sprays compressed fluid on the part where two spun yarns overlap each other Therefore, the overlapping parts of the two spun yarns are connected together by untwisting the overlapping parts and making them entangle with each other.

The first splice head 33 serves as a spun yarn connecting means for performing the spun yarn connecting step described above to connect the two knitting yarns 21 and 22 to each other. The first splice head 33 is formed with a first groove 33a that defines a cylindrical first splice space 60 whose axis L1 extends in the horizontal direction XI (hereinafter referred to as “XI direction”). The first groove 33 a is formed with a first nozzle hole 33 b for supplying compressed air to the first splice space 60. The first groove 33a opens in the upward direction X2 (hereinafter referred to as “X2 direction”) from one end to the other end in the XI direction. The opening 33c is formed with a triangular prism-shaped first entrance / exit space 61 that expands toward the end in the X2 direction from the first groove 33a.

The second splice head 34 serves as a protrusion fixing means for fixing the protrusion 23 and the branching part 51 by performing the protrusion fixing process described above. The second splice head 34 is formed with a second groove 34a that defines a cylindrical second splice space 62 extending in the vertical direction. The second groove portion 34 a is formed with a second nozzle hole 34 b for supplying compressed air to the second splice space 62. Further, the second groove portion 34a opens in the other horizontal direction X3 (hereinafter referred to as “X3 direction”) up to the other end in the vertical direction. The opening 34c is formed with a triangular column-shaped second entrance / exit space 63 that widens toward the end in the X3 direction from the second groove 34a. Further, the second nozzle hole 34b extends downward by force as it is separated from the second splice space 62 in the horizontal direction. In the present embodiment, the axis L2 of the second splice space 62 and the axis L3 of the second nozzle hole 34b are formed so that the relative angle Θ is 30 degrees. The second nozzle hole 34b is inclined in the direction opposite to the yarn feeding direction B, that is, upwardly, as the nozzle opening force advances toward the center of the second splice space 62 in the direction perpendicular to the yarn feeding direction B. Compressed air is ejected in direction A. The inclination direction A and the axis L2 of the second splice space 62 are arranged on the same plane.

A flat knitting machine 31 including a yarn splicing device 30 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-118059. As shown in FIG. 2, the flat knitting machine 31 includes a plurality of yarn feeders 37 that feed knitting yarns 41 spliced by the yarn splicing device 30 to the knitting needles. The flat knitting machine 31 selectively selects the knitting yarn 41 to be supplied to the knitting needles by switching the yarn feeder 37 taken along the carriage 36. Can be switched. However, since the number of yarn feeders 37 that can be used is limited, the types of knitting yarns 41 that can be used are limited. By switching the types of the knitting yarns 41 with the yarn joining device 30, the types of the knitting yarns 41 that the yarn feeder 37 can supply can be increased.

In order to prevent the tension acting on the knitting yarn 41 from fluctuating rapidly between the yarn splicing device 30 and the yarn feeder 37 in the yarn feeding path of the knitting yarn 41, the constant feeding device for the knitting yarn 41 38 Is provided. The flat knitting machine 31 includes a control unit 39 and a counter unit 40. The control unit 39 sets the length of the knitting yarn necessary for knitting the knitted fabric, for example, the length of the knitting yarn necessary for knitting one row in the course direction, under the condition that the fluctuation of the tension acting on the knitting yarn is small. As previously calculated. The control unit 39 also detects the position of the carriage 36 by a position sensor force provided on the carriage 36. The control unit 39 calculates the timing for splicing the knitting yarn 41 based on the position of the carriage 36 and the calculated knitting yarn length. The control unit 39 causes the yarn splicing device 30 to perform yarn splicing based on the calculation result. Further, the control unit 39 performs control so as to reduce the speed of the knitting yarn constant delivery device 38 when performing piecing compared to when piecing is not performed. Further, the counter unit 40 counts the time and gives the time measurement result to the control unit 39. FIG. 4 is a flowchart showing the procedure of the yarn joining process of the yarn joining device 30. FIG. 5 is a flowchart showing the procedure of the protrusion fixing process. 6A to 6D are views showing the operation of the yarn splicing device 30 in each step of the protrusion fixing process. 6A to 6D, the yarn feeding direction B of the knitting yarn is set downward. In the present embodiment, the splicing is used when supplying knitting yarns having different properties from one yarn feeder 37, for example, in an inertia knitting.

The control unit 39 determines the length of the knitting yarn necessary for knitting to the position at which the color pattern is switched and the knitting force from the first splice head 33 to the knitting needle for knitting the color pattern switching position. If it is determined that the yarn paths match, the process proceeds to step si to cause the yarn joining device 30 to start yarn joining.

In step s1, which is a spun yarn connecting step, for example, two knitting yarns 21, 22 are produced by a method similar to the yarn joining method by the yarn joining device disclosed in JP-A-2005-314104. Are concatenated. Specifically, the guide members guide the overlapping portions 21e, 22e of the two knitting yarns 21, 22 before connection from the first entrance / exit space 61 to the first splice space 60. At this time, one knitting yarn 21 has a remaining portion 21f excluding the tip overlapping portion 21e extending upward from the first splice space 60. In the other knitting yarn 22, the remaining portion 22f excluding the tip overlapping portion 22e extends downward from the first splice space 60 and passes through the second splice space 62. In this state, the vicinity of the spacing portions 21c and 22c of the respective knitting yarns 21 and 22 is clamped by the clamp mechanism, and the vicinity of the tip portions 21a and 22a of the respective knitting yarns 21 and 22 is cut by the cutter. The overlapping portions 22e and 22e of the two knitting yarns 21 and 22 are fitted into the first groove portion 33a so as to overlap in the XI direction (FIG. 6A).

Next, the yarn splicing device 30 blows compressed air from the first nozzle hole 33b to the first splice space 60 to start the entanglement of the respective overlapping portions 2le and 22e of the knitting yarns 21 and 22. When the first set time tl elapses after the start of compressed air blowing, the compressed air blowing is stopped. The first set time tl is, for example, 100 msec, and is set to a time during which the outer shapes of the tip overlapping portions 21e and 22e do not become excessively small. In this way, the knitting yarns 24 having the projections 23 are formed by interlacing the end overlapping portions 21e and 22e of the two knitting yarns 21 and 22 and integrating them together. When the compressed air blowing is stopped, the clamp is released, the connected knitting yarn 24 is released, and the feeding of the knitting yarn 24 is resumed. As a result, the spun yarn connecting process is completed, and the process proceeds to step s2.

In step s2 which is the protrusion fixing process, steps s21 to s25 in FIG. 5 are sequentially performed. First, in step s21, when it is determined that the spun yarn connecting step is completed, the counter unit 40 starts counting, and the process proceeds to step s22. In step s22, the connected knitting yarn 24 is fed in the yarn feeding direction B by the constant feeding device 38, and the control unit 39 determines whether or not the counting by the counter unit 40 has exceeded the second set time t2.

When the connected knitting yarn 24 is fed in the yarn feeding direction B, the protruding portion 23 escapes from the first splice space 60. As a result, in the knitting yarn 24, the two branch portions 51 and 52 extend in the vertical direction, and the protrusion 23 protrudes in the XI direction (FIG. 6B). At this time, starting from the connecting portion 50, one branch portion 51 extends upward, and the other branch portion 52 extends downward. The other branch portion 52 is fitted into the second groove portion 34a. When the constant feed device 38 is driven and the knitting yarn 24 is fed in the yarn feeding direction B, the projection 23 is fitted into the second groove 34a. The protrusion 23 is folded by the upper opening 34d of the second groove 34a from the lower opening 34e of the second groove 34a toward the upper opening 34d. As a result, the protrusion 23 is overlapped along the one branching portion 51 on the upstream side in the yarn feeding direction from the root to the tip 23a. (Figure 6C). Thus, the time from when the protruding portion 23 and one branching portion 51 escape from the first groove portion 33a until it fits into the second groove portion 34a is the second set time t2. The second set time t2 is, for example, 100 msec. If the controller 39 determines that the second set time t2 has not elapsed, the process returns to step s22 to repeat the determination. If the controller 39 determines that the second set time t2 has elapsed, the process proceeds to step s23.

In step s23, the blowing of compressed air from the second nozzle hole 32b to the second splice space 62 is started. As a result, the projecting portion 23 fitted in the second groove portion 34a and one branch portion 51 begin to partially interlace. Specifically, the compressed air injected from the second nozzle hole 32b proceeds in the inclination direction A. By blowing the compressed air in the inclined direction A in this way, the protrusions 23 fall toward the one branching part 51 and are easily entangled with each other. When the compressed air blowing starts, the process proceeds to step s24.

In step s24, the count of the counter unit 40 determines whether or not the force has also passed the third set time t3 after the start of the blowing of the compressed air to the second splice space 62. The third set time t3 is the time for two branches while securing the strength of the knitting yarn 25 after splicing obtained by tangling the protrusion 23 and one branch 51 after the start of spraying. This is the time required to secure the joint strength of parts 51 and 52. If the time for exposing the connected knitting yarn 24 to the air flow is long, the joining strength increases, but the outer diameter near the joint of the knitting yarn 24 after the connection becomes thin, and the strength of the knitting yarn itself becomes weak. On the contrary, if the knitting yarn 24 after connection is exposed to the airflow for a short time, the bonding strength is weakened. Taking this situation into consideration, the third set time t3 is determined. The third set time t3 is, for example, 100 msec. If it is determined that the third set time t3 has not elapsed, the process returns to step s24 to repeat the determination, and if it is determined that the third set time t3 has elapsed, the process proceeds to step 25.

In step s25, the supply of compressed air to the second splice space 62 is stopped, and the protrusion fixing process is terminated. In this way, the second splice head 34 allows the tip 22 from the root. It is possible to form a knitting yarn 25 that is integrally wound in a state where the protrusion 23 is superposed along the bifurcated portion 51 over a. When the protruding portion fixing process is completed, the knitting yarn 25 in which the protruding portion 23 and the branching portion 51 are integrated is passed through the second entrance / exit space 63 in the X3 direction by the guide member, and is separated from the second groove portion 34a. And is arranged so as to pass through the opening 34c. The knitting yarn 25 (41) obtained by splicing in this way is fed to the knitting needle by the yarn feeder 37 to knit the knitted fabric. Accordingly, the knitted fabric having different color patterns can be knitted by the knitting yarn 25 (41) supplied from one yarn feeder 37. Further, by switching the type of the knitting yarn introduced to the yarn feeder 37 by the yarn joining device 30, the types of the knitting yarns 41 that can be fed by the yarn feeder 37 can be increased.

According to the yarn splicing method of the present embodiment as described above, the knitting yarns 21 and 22 are connected by the separating portions 21c and 22c in the spun yarn connecting step, so that the outer portions of the branch portions 51 and 52 are connected at the time of knitting connection. The strength of the knitting yarn to be spliced can be secured by preventing the diameter from becoming smaller. Further, in the protruding portion fixing step, the protruding portion 23 is disposed and fixed along the one branch portion 51, whereby the protruding amount H2 of the protruding portion 23 with respect to the branched portions 51 and 52 can be reduced. In this way, it is possible to produce the knitted yarn 25 after splicing that ensures strength while maintaining the appearance.

When the knitted fabric is knitted using the knitting yarn 25 after splicing, the protruding portion 23 is prevented from protruding outward from the surface of the knitted fabric. Therefore, it is possible to omit the work of checking the protruding portion 23 protruding outward from the surface of the knitted fabric and the operation of inserting the protruding protruding portion 23 into the inside of the knitted fabric. Omitted, it is possible to provide a knitted fabric that does not impair the appearance with fewer steps. Further, by preventing the protrusion 23 from protruding, the texture of the knitted fabric can be made uniform. Further, according to the yarn splicing device 30 of the present embodiment, it is possible to realize a yarn splicing method that can achieve the operations and effects described above.

In the present embodiment, the branch portion 51 to which the protrusion 23 is fixed is a branch portion that is disposed on the upstream side in the yarn feeding direction with respect to the connecting portion 50. As a result, compared to the case where the tip 23a of the projection 23 is arranged downstream of the connecting portion 50 in the yarn feeding direction B, the yarn feeding when the knitting yarn 25 after splicing is fed is performed. The resistance can be reduced, and the yarn feeding to the yarn feeder 37 can be performed smoothly.

Also, in the protrusion fixing process, in the inclined direction A with respect to the direction in which the connected knitting yarn 24 extends. Spray with compressed air. Further, after partially untwisting each of the protruding portion 23 and the branching portion 51, the untwisted portions are entangled with each other to fix the protruding portion 23 to the branching portion 51. As a result, excessive twisting is prevented from occurring between the projection 23 and the one branching portion 51, and the strength of the knitting yarn 25 after piecing is reduced when a part of the outer diameter of the knitting yarn 25 becomes extremely thin. It can be prevented. The compressed air is directed toward the branch portion 51 to be fixed, and the projection 23 is sprayed in the direction of the force. As a result, the projecting portion 23 falls toward the branch portion 51 to be fixed, and the projecting portion 23 can be entangled and fixed to the branch portion 51 more reliably.

7A and 7B are perspective views showing the second splice head 34 for explaining the yarn splicing method according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view taken along line S8—S8 in FIG. 7A. FIG. 9 is a cross-sectional view taken along the line S9—S9 in FIG. FIG. 10A and FIG. 10B are diagrams schematically showing a yarn joining device 30A that realizes the yarn joining method of the second embodiment. The second embodiment has the same configuration as that of the first embodiment except that the direction of compressed air blowing is different from that of the first embodiment in the protrusion fixing step. Is omitted.

The second splice head 34 flows in a turning direction 70 that advances in one axial direction of the branch portion 51 while turning around the axis L2 of the second splice space 62 with the protrusion 23 fitted in the second groove 34a. In this manner, compressed air is blown from the second nozzle hole 34b (FIG. 7A). Accordingly, in step s23, the protrusion 23 fitted in the second groove 34a turns around the axis of the one branch portion 51 a plurality of times and sticks to the one branch portion 51 (FIG. 7B). The protrusion 23 and one branch 51 may be fixed by brazing in this way.

In the present embodiment, the compressed air flows while swirling around the axis L2 while proceeding in the inclined direction A by the second nozzle hole 34b. As a result, the projecting portion 23 falls toward the one branching portion 51 and is easily caught on the one branching portion 51 (FIG. 8). Further, when viewed in a cross section perpendicular to the axis L2, the inclination direction A is bent along the axis L2 toward the inner peripheral surface of the second groove 34a. As a result, the compressed air can be swung around the axis L2 along the inner peripheral surface of the second groove 34a (FIG. 9). Even in the second embodiment, by performing the procedure shown in the first embodiment, piecing can be performed in the same manner, and the same effect as in the first embodiment can be obtained. Further, by turning the protrusion 23, the twist of the branch 51 can be prevented from being untwisted regardless of the spraying time of the compressed fluid, and the branch 51 overlapping the protrusion 23 and its vicinity region can be prevented. The diameter of the spun yarn can be prevented from becoming thinner, and the strength of the spun spun yarn can be prevented from being reduced. Moreover, the timing of spraying the compressed fluid can be widened, and the yarn joining control can be easily realized. Further, it is preferable that the turning direction 70 is a direction in which the twist of one branch portion 51 is tightened.

Further, the splicing device 30A of the second embodiment is provided with turning resistors 71 and 72 serving as resistors that prevent the respective branch portions 51 from turning around the axis. In the present embodiment, the turning resistors 71 and 72 are realized by a tension applying device that applies tension to the knitting yarn 41, and are respectively disposed on the upstream side and the downstream side of the second splice head 34 in the yarn feeding direction. Therefore, even if a swirl flow is generated by compressed air in the protrusion fixing process, it is possible to prevent the branch parts 51 and 52 from rotating together with the protrusion 23. As a result, the rotation of the projection 23 relative to the branch 51 can be reliably performed, and the time required for hooking the projection 23 onto the branch 51 can be shortened.

As described above, the protrusion fixing process is performed in the second embodiment even if the protrusion 23 is fixed in a state where the protrusion 23 is superposed along the one branching portion 51, even if the confounding method shown in the first embodiment is used. The brazing method shown in the form may be used. As another method, the protruding portion 23 and the branching portion 51 may be mechanically kneaded or twisted so that they are integrated with each other.

In the present embodiment, the piecing method of the knitting yarn has been described. However, the present invention can be applied to all methods of piecing spun yarn in which fibers are spun. Therefore, it may be applied to piecing of woven yarn made of spun yarn. Further, in each of the embodiments, the protrusion 23 is integrally fixed to the branch portion 51 on the upstream side in the yarn feeding direction B with respect to the connecting portion 50, but the downstream side in the yarn feeding direction B with respect to the connecting portion 50. It may be fixed integrally with the branch portion 52. In this case, it can be realized by inserting the connected knitting yarn 24 into the second groove 34a of the second splice head 34 from the direction opposite to the yarn feeding direction B.

In this embodiment, the first splice head 33 is disposed on the upper side and the second splice head 34 is disposed on the lower side. However, the first splice head 33 is disposed on the lower side and the first splice head 33 is disposed on the upper side. Two splice heads 34 may be arranged. In this case, the yarn feeding direction B is also It will be a direction that is directed upward from the direction. Thus, the arrangement of the splice heads 33 and 34 is not limited, and the X1 to X3 directions can be arbitrarily set. Further, the spun yarn connecting step and the protrusion fixing step may be performed with one splice head.

In the present embodiment, each splice head 33, 34 sprays compressed air onto the spun yarn, but may also spray other compressed fluid such as a liquid onto the spun yarn. By blowing compressed air onto the spun yarn, the spun yarn can be connected and the protrusion fixed with a simple configuration. Further, the yarn joining device 30 can be used other than intarsia knitting. For example, when the flat knitting machine 31 includes the yarn splicing device 30, the types of knitting yarns 41 that can be fed by the yarn feeder 37 can be increased.

FIG. 11 is a front view showing the knitting yarn 24B connected in the spun yarn connecting step of the yarn splicing method according to the third embodiment of the present invention. 12A to 12D are front views respectively showing a state in which the protrusions 23a and 23b are fixed. In the third embodiment, the spun yarn connecting step has the same configuration as the first or second embodiment except that the connecting method is different from that in the first or second embodiment. Description is omitted.

In the third embodiment, a plurality of knitting yarns 21 and 22 are coupled together by a knotter device that is a yarn bundling device. In a state where the two knitting yarns 21 and 22 are connected, a knot is formed at the spacing portions 21c and 22c. As a result, the connecting part 50, the projections 23a, 23b that extend to the leading ends 21a, 21b of the respective knitting yarns 21, 22 and the base ends of the plurality of knitting yarns 21, 22 from the connecting part 50 are thereby obtained. A plurality of branch portions 51 and 52 extending respectively in the direction toward the portions 21d and 22f are formed. In the third embodiment, protrusions 23a and 23b are formed as many as the number of knitting yarns 21 and 22 to be connected. For example, a knotter device is disclosed in JP-A-6-2250.

Even in the third embodiment, as in the first or second embodiment, in the protrusion fixing step, the protrusions 23a and 23b are overlapped along the at least one branch part 51 and 52, respectively. It is fixed with. In the protrusion fixing process, each protrusion 23a, 23b may be entangled and fixed to one branch 51 (Fig. 12A), and each protrusion 23a, 23b may be entangled and fixed to a different branch 51, 52. Yes (Figure 12B). In the protrusion fixing step, the protrusions 23a and 23b may be brazed and fixed to one branch 51 (Fig. 12C), and the protrusions 23a and 23b are respectively fixed. It may be fixed by brazing to different branch parts 51 and 52 (FIG. 12D). Also in the third embodiment, by performing the protrusion fixing process, the protrusions H12 to H15 from which the protrusions 23a and 23b protrude from the branching part 51 are made smaller than the protrusion HI1 before fixing the protrusion. Can do.

As described above, the spun yarn connecting step is the entanglement method shown in the first embodiment as long as the spun yarns 21 and 22 are connected so that the plurality of branch portions 51 and 52 branch from the protrusion 23. Alternatively, the combination method shown in the third embodiment may be used. Further, a knotter device for forming other than the knot shown in FIG. 11 may be used. Further, the spun yarns 21 and 22 may be connected by other methods for forming the projections 23, a hulling method or a yarn twisting method.

In the present embodiment as described above, the method of joining two knitting yarns 21 and 22 has been described. However, the knitting of a plurality of knitting yarns that are three or more, such as two-take or multi-take. Even in this case, the same splicing method can be applied by regarding a superposition of a plurality of knitting yarns as one knitting yarn. Further, the machine provided with the yarn splicing device 30 of the present embodiment is not limited to the flat knitting machine 31, and may be other machines such as a loom or a winder. In addition, the present invention includes a spun yarn that is spliced by a splicing method, and a knitted fabric or a woven fabric that is knitted and woven by the spun yarn.

The present invention can be implemented in various other forms without departing from the spirit or main characteristic power thereof. Therefore, the above-described embodiment is merely an example in all respects, and the scope of the present invention is shown in the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the scope of claims are within the scope of the present invention.

Industrial applicability

According to the present invention, in the spun yarn connecting step, each spun yarn is formed with a connecting portion, a protrusion, and a plurality of branch portions. By connecting each spun yarn at the connecting portion, it is possible to prevent the outer diameter of each branching portion from being reduced when the spun yarn is connected, and to ensure the strength of the spun yarn to be spliced. Further, in the protruding portion fixing step, the protruding portion is overlapped along the branch portion, and the protruding portion and the branched portion are fixed, so that the protruding amount of the protruding portion protruding from the branched portion can be suppressed. In addition, when the knitted fabric is knitted using spun yarn that has been spliced, the protruding portion is prevented from protruding outward from the surface of the knitted fabric, and the protruding portion that protrudes outward from the surface of the knitted fabric. It is possible to omit the whisker processing step of inserting the inward into the knitted fabric.

According to the present invention, the branch portion and the protruding portion that are arranged on the upstream side in the yarn feeding direction are fixed. This makes it possible to reduce the yarn feeding resistance when feeding the yarn compared to the case where the tip of the projection is arranged downstream in the yarn feeding direction, and the yarn feeding of the spun spun yarn that has been spliced. Can be done smoothly.

According to the present invention, in the protruding portion fixing step, the protruding portion and the branch portion are partially untwisted and then entangled. As a result, excessive yarn entanglement can be prevented between the protruding portion and the branching portion, and the diameter of the branching portion that overlaps the protruding portion and the area in the vicinity thereof is prevented from being reduced. It is possible to prevent the strength of the spun yarn from being reduced.

According to the present invention, in the protrusion fixing step, the protrusion is turned around the axis of the branch portion, and the protrusion is wound around the branch portion. By turning the protrusion, it is possible to prevent the twist of the branching portion from being untwisted, and to prevent the diameter of the branching portion that overlaps the protruding portion and the vicinity thereof from becoming narrower, and the spun yarn that has been spliced. According to the present invention, in the projection fixing step, the branch portion is prevented from rotating together with the projection portion, so that the projection portion can be reliably rotated relative to the branch portion. Therefore, it is possible to shorten the time required for attaching the protrusion to the branching portion.

According to the present invention, in the protrusion fixing step, by blowing the compressed fluid, it is possible to apply a force that causes the protrusion to fall toward the branch to be fixed, and to fix the protrusion to the branch more reliably. be able to.

According to the present invention, in the spun yarn connecting step, a plurality of spun yarns are connected by connecting spun yarns by either a method of connecting the yarns by entanglement or a method of connecting them by connecting them. can do.

According to the present invention, it is possible to obtain a spun yarn with less radial unevenness while preventing a decrease in strength and suppressing the protrusion amount of the protrusion from the branch portion.

According to the present invention, it is possible to realize a knitted fabric in which part of the spun yarn is prevented from protruding outward in the thickness direction. According to the present invention, the spun yarn connecting means connects the spun yarns at the connecting portion, so that the outer diameter of each branch portion can be prevented from being reduced during spun yarn connection. The strength of the yarn can be ensured. Further, the protruding portion is arranged and fixed along the branching portion by the protruding portion fixing means, so that the protruding amount of the protruding portion protruding from the branching portion can be suppressed. As a result, the protrusions are prevented from protruding outwardly from the surface force of the knitted fabric, and the beard treatment step of inserting the protrusions into the knitted fabric can be omitted.

According to the present invention, the protruding portion fixing means fixes the branch portion and the protruding portion arranged on the upstream side in the yarn feeding direction, thereby reducing the resistance of yarn feeding and reducing the spliced spun yarn. Yarn feeding can be performed smoothly.

According to the present invention, the protruding portion fixing means can partially fix the protruding portion and the branching portion by winding the protruding portion around the force branching portion. According to the present invention, the spun yarn connecting means can connect the separated portions of the plurality of spun yarns to each other by intertwining or connecting the spun yarns.

According to the present invention, the first splice head connects the plurality of spun yarns by injecting the compressed fluid onto the portion where the plurality of spun yarns are overlapped. The second splice head fixes the protruding portion and the branching portion by injecting a compressed fluid onto the protruding portion formed by the first splice head. By using the compressed fluid in this way, it is possible to link a plurality of spun yarns and fix the projections and the branching portions.

Claims

The scope of the claims

[1] A yarn joining method for joining ends of a plurality of spun yarns,

A protruding portion fixing step for fixing the protruding portion and the branched portion superimposed on the protruding portion by overlapping the protruding portion along at least one of the plurality of branched portions; Yarn splicing method characterized by

[2] In the protrusion fixing step, the branch portion to which the protrusion is fixed is a branch portion arranged on the upstream side in the yarn feeding direction in which each spun yarn is fed and conveyed with respect to the connecting portion. The yarn splicing method according to claim 1, characterized in that:

[3] In the protrusion fixing step, after each of the protrusion and the branch part are partially untwisted

3. The yarn splicing method according to claim 1, wherein the untwisted portions are entangled with each other, and the protruding portion is fixed to the branch portion.

[4] The protrusion fixing step includes rotating the protrusion around an axis of the branch, winding the protrusion around the branch, and fixing the protrusion to the branch. The yarn splicing method described.

5. The yarn splicing method according to claim 4, wherein, in the protrusion fixing step, the protrusion is wound around the branch portion in a state where the branch portion is prevented from rotating together with the protrusion.

6. The protruding portion fixing step includes fixing the protruding portion and the branch portion by spraying a compressed fluid in a direction in which the protruding portion is directed toward the branch portion to be fixed. ~ 5

V, Misalignment Yarn splicing method as described in one.

[7] The spliced yarn according to any one of claims 1 to 6, wherein, in the spun yarn connecting step, a plurality of spun yarns are entangled and the separated portions of the spun yarns are connected to each other. Method.

[8] The spliced yarn according to any one of claims 1 to 6, wherein, in the spun yarn connecting step, a plurality of spun yarns are combined, and a plurality of spun yarn separated portions are connected to each other. Direction Law.

A spun yarn that is spliced by the splicing method according to any one of claims 1 to 8. A knitted fabric knitted by a knitting yarn spliced by the yarn splicing method according to any one of claims 1 to 8.

A yarn splicing device for splicing the ends of a plurality of spun yarns,

A plurality of spun yarns are connected to each other, and the leading end portion force of the plurality of spun yarns is connected to each other with a separation portion that is separated in the direction toward the base end portion, and from the connecting portion to the leading end portion of each spun yarn Spun yarn coupling means for forming on each spun yarn a projecting portion that extends and a plurality of branch portions that respectively extend from the coupling portion toward the base ends of the plurality of spun yarns;

A protrusion fixing means for fixing the protrusion and the branch overlapped with the protrusion by overlapping the protrusion along at least one of the plurality of branches; Yarn splicer characterized by.

12. The projecting portion fixing means fixes the projecting portion to a branch portion disposed on the upstream side in the yarn feeding direction in which each spun yarn is fed and conveyed with respect to the connecting portion. Yarn splicing device.

The projecting portion fixing means, after partially untwisting the projecting portion and the branch portion, entangles the untwisted portions with each other to fix the projecting portion and the branch portion. 1 Yarn splicer according to 1 or 12.

12. The protruding portion fixing means is configured to fix the protruding portion and the branching portion by turning the protruding portion around the axis of the branching portion and winding the protruding portion around the branching portion. The yarn splicing device described.

The splicing device according to any one of claims 11 to 14, wherein the spun yarn connecting means entangles a plurality of spun yarns and connects separated portions of the spun yarns to each other. The splicing device according to any one of claims 11 to 14, wherein the spun yarn connecting means combines a plurality of spun yarns and connects a plurality of spun yarn spacing portions to each other. The yarn connecting means sprays a compressed fluid onto the portion where a plurality of spun yarns are overlaid. Thus, the first splice head for connecting a plurality of spun yarns, and the protrusion fixing means includes a second splice head for fixing the protrusion and the branch by spraying compressed fluid onto the protrusion. The yarn splicing device according to any one of claims 13 to 15, characterized in that: