JP2012132107A - Method for knitting three-dimensional fabric, three-dimensional fabric and pipe cover made of the fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional fabric which can be easily knitted and easily cover a pipe and the like.SOLUTION: A three-dimensional fabric is knitted by a flat-knitting machine comprising at least a pair of needle beds in front and back. An obverse knitted fabric is knitted by one of the pair of needle beds and a reverse knitted fabric is knitted by the other thereof so as to make the obverse knitted fabric larger in size in a warp direction than the reverse knitted fabric, and the obverse knitted fabric and the reverse knitted fabric are connected by a connecting thread. The knitted three-dimensional fabric is curved in a C-shape in the warp direction, in which a cast-on portion and a cast-off portion face each other.

Description

  The present invention relates to a three-dimensional knitted fabric that is bent in a C shape. The three-dimensional knitted fabric is knitted by a flat knitting machine and is suitable for a pipe cover or the like.

  A three-dimensional knitted fabric in which a front knitted fabric and a back knitted fabric are connected by a connecting yarn is known (for example, Patent Document 1: JP 2004-107800 A). When the connecting yarn of the three-dimensional knitted fabric is constituted by an elastic yarn such as a monofilament, the connecting yarn maintains the space between the knitted fabrics on the front and back sides, and a hard and thick three-dimensional knitted fabric is obtained. When a soft yarn such as wooly nylon (multifilament nylon yarn) is used as the connecting yarn, a thick three-dimensional knitted fabric excellent in cushioning properties is obtained. Such a three-dimensional knitted fabric is knitted in a flat shape, for example, cut into a tape shape, sewed end faces, and wound around a protection object such as a pipe.

  However, it is troublesome to cut and sew a flat knitted fabric into a tape. Moreover, it is troublesome to wind the tape around a pipe or the like, and when the diameter of the pipe changes midway, it becomes difficult to wind the tape around the pipe.

JP2004-107800

  An object of the present invention is to use a knitting method of a three-dimensional knitted fabric having a property of bending in a C shape along the length direction of the knitted fabric, a three-dimensional knitted fabric knitted in this way, and the three-dimensional knitted fabric. It is to provide a pipe cover.

This invention is a method of knitting a three-dimensional knitted fabric with a flat knitting machine having at least a pair of front and back needle beds,
The front knitted fabric and the back knitted fabric on one side of the pair of needle beds are knitted so that the length direction size of the front knitted fabric is larger than the length direction size of the back knitted fabric. By connecting with the knitted fabric with a connecting thread,
A three-dimensional knitted fabric that is bent in a C-shape along the length direction and in which a set-up portion and a knitting end portion face each other is knitted.

  In this way, a three-dimensional knitted fabric that bends in a C shape along the length direction and in which the set-up portion and the knitting end portion face each other can be easily knitted by the flat knitting machine. In addition, the three-dimensional knitted fabric can be knitted with a size according to the object.

  In order to make the length direction size of the front knitted fabric larger than the length direction size of the back knitted fabric, it is possible to shrink the back knitted fabric using heat shrink yarn, but a shrink yarn is necessary. On the other hand, when the number of stitches along the length direction is larger in the front knitted fabric than in the back knitted fabric, the size in the length direction of the front knitted fabric can be easily made larger than the size in the length direction of the back knitted fabric. Even if the stitch size of the front knitted fabric is larger than the stitch size of the back knitted fabric, the length direction size of the front knitted fabric can be easily made larger than the length direction size of the back knitted fabric. For this reason, the three-dimensional knitted fabric bent in the C shape efficiently can be knitted.

  By knitting a part of the front knitted fabric and the back knitted fabric by turn back knitting, a solid knitted fabric in which the set-up portion and the knitting end portion of the solid knitted fabric are not parallel to the C-shaped axis can be knitted. If the set-up portion and the knitting end portion are not parallel to the C-shaped axis, they are difficult to come off when covered with a pipe or the like. In addition, by knitting a part of the front knitted fabric and the back knitted fabric by turn-back knitting, a three-dimensional knitted fabric in which the C-shaped diameter changes can be knitted. When the C-shaped diameter changes, it fits into pipes that change in diameter.

  The present invention also includes a knitted fabric with a flat knitting machine, and a connecting yarn that connects the front knitted fabric and the back knitted fabric, and the front knitted fabric and the back knitted fabric. Since it is larger than the length direction size, it is in a three-dimensional knitted fabric that bends in a C shape along the length direction and that the set-up portion and the knitting end portion face each other.

  The present invention further comprises knitted with a flat knitting machine, and comprises a connecting yarn connecting the front knitted fabric and the back knitted fabric, and the front knitted fabric and the back knitted fabric. Since it is larger than the size in the length direction, the pipe cover is bent in a C shape along the length direction, and the set-up portion and the knitting end portion face each other.

Since such a three-dimensional knitted fabric and a cover are knitted to a size that matches the target pipe or the like, there is no need to process into a tape shape. Moreover, since it bends in the C shape from the beginning, it fits only by covering on columnar or cylindrical members, such as a pipe, and does not come off easily. In addition, the description regarding the knitting method of the three-dimensional knitted fabric in this specification applies to the three-dimensional knitted fabric and the cover as they are.

Plan view of the three-dimensional knitted fabric knitted in the example Side view of three-dimensional knitted fabric knitted in Example The top view of the solid knitted fabric which added the spiral of the C-shaped opening part to the Example Plan view of solid knitted fabric with solid molding added to the example Top view of flat knitting machine The figure which shows the knitting method of the solid knitted fabric of FIG. 1, FIG. The figure which shows the mechanism in which the solid knitted fabric of FIG. 1, FIG. 2 deform | transforms into a C shape. The figure which shows the pattern of the solid knitted fabric of FIG. The figure which shows the pattern of the solid knitted fabric of FIG.

  In the following, an optimum embodiment for carrying out the invention will be shown. The scope of the present invention should be construed in consideration of the possibility of modification by well-known techniques in the description of the scope of claims.

  1 to 9 show an embodiment and its modifications. The three-dimensional knitted fabric of the embodiment is characterized by being bent in a C shape along the length direction, and is knitted by a flat knitting machine. In the embodiment, the front knitted fabric and the back knitted fabric are knitted by the flat knitting machine, and the front knitted fabric and the back knitted fabric are connected by the connecting yarn by the flat knitting machine. The front knitted fabric is larger than the back knitted fabric by increasing the size of the stitches on the front knitted fabric and / or increasing the number of stitches along the length direction. Knit with direction size. Then, the front knitted fabric appears on the front side, and the three-dimensional knitted fabric is bent in a C shape along the length direction so that the back knitted fabric is hidden inside, and the set-up portion and the knitting end portion face each other at the C-shaped opening. To do. Since it can be knitted by a simple knitting method, a three-dimensional knitted fabric bent in a C shape can be knitted efficiently. However, the length along the C-shaped axis of the three-dimensional knitted fabric is limited to not more than the length of the needle bed of the flat knitting machine. The three-dimensional knitted fabric that is bent in a C-shape is knitted after the knitting by knitting the front knitted fabric and the back knitted fabric with a uniform length direction size at the time of knitting, The back knitted fabric may be contracted. This is also an example of knitting so that the length direction size of the front knitted fabric is larger than the length direction size of the back knitted fabric after knitting. Further, by back knitting, the front knitted fabric can be knitted so that the size in the length direction is larger than the back knitted fabric.

  1 and 2 show a three-dimensional knitted fabric of the embodiment, and a colored yarn portion is a discarded knitted portion before the set-up portion and a portion that is later removed from the three-dimensional knitted fabric. The solid knitted fabric of FIGS. 1 and 2 is composed of two layers of front and back knitted fabrics and connecting yarns connecting these knitted fabrics, and two layers are formed between the colored yarn portions of FIGS. The knitted fabric and the connecting yarn are visible. The knitted fabric of FIGS. 1 and 2 is knitted by a flat knitting machine, and the direction parallel to the needle bed at the time of knitting is the left-right direction (width direction) of FIG. 1, and the direction along the C-shape is the length direction of the knitted fabric. . In FIGS. 1 and 2, the number of courses of the stitch is 1/2 of the knitted fabric (knitted fabric hidden inside the C shape) of the front knitted fabric (knitted fabric appearing outside the C shape), and the number of courses is in the length direction. The ratio of the number of courses is not limited to 1: 2, but the number of courses in the front knitted fabric may be larger than the number of courses in the back knitted fabric.

  The solid knitted fabric of FIGS. 1 and 2 is suitable for, for example, heat insulation or protection of pipes, and is also used for protection or heat insulation by covering a cylindrical or columnar object, a human leg or the like. When a three-dimensional knitted fabric is used as the heat insulating cover, the three-dimensional knitted fabric itself is required to have heat resistance, and for example, knitted with a heat-resistant yarn such as aramid. On the other hand, when using a three-dimensional knitted fabric as a cushioned cover to protect an object, heat resistance of the yarn is not required, and instead of using wooly nylon (multifilament nylon) as the connecting yarn, the amount of connecting yarn is increased. In addition, a soft connecting thread is used to provide cushioning. In general, a monofilament connecting yarn is suitable for a hard three-dimensional knitted fabric, and a multifilament connecting yarn is suitable for a soft three-dimensional knitted fabric.

  The solid knitted fabric of FIGS. 1 and 2 can be knitted within the range of the knitting width of the flat knitting machine, that is, within the length of the needle bed, so that the natural knitted fabric on the front knitted fabric can be obtained. By making the size larger than the back knitted fabric, it is bent in a C shape along the length direction. In other respects, the front knitted fabric and the back knitted fabric are knitted, and the front and back knitted fabrics are simply connected by connecting yarns due to tack or mistake. Therefore, the knitting efficiency is high.

  In the three-dimensional knitted fabric of FIG. 3, the three-dimensional knitted fabric of FIG. 1 and FIG. 2 is deformed, and the portions where the knitted fabric faces each other (the set-up portion and the knitting end portion at the end of the knitted fabric) are spiral. The three-dimensional knitted fabric of FIG. 3 can be easily covered with a pipe or the like, and is not easily detached.

  FIG. 4 shows another modified example in which the C-shaped diameter is larger on the right side than on the left side of the figure. For this reason, it can be easily put on a portion such as a joint where the diameter of the pipe changes.

  FIG. 5 shows a flat knitting machine 2 used in each embodiment, and reference numerals 4 and 6 denote a pair of front and back needle beds, which may be provided with a total of four needle beds in the front and rear directions. A carriage 8 reciprocates on the needle beds 4 and 6 and operates the needles on the needle beds 4 and 6 to knit the three-dimensional knitted fabric. A racking motor 9 relatively moves the needle beds 4 and 6 in the horizontal direction in FIG. Instead of the carriage 8, a group of linear motors may be provided on the needle beds 4 and 6, and the needles may be advanced and retracted by the linear motors. The yarn is supplied from a yarn feeder (not shown), and the size of the stitch to be knitted can be controlled by changing the pull-in amount of the needle in the needle bed with a cam. The flat knitting machine 2 includes a needle selection device, and can form stitches with all the needles or stitches at a ratio of one stitch to two stitches.

  FIG. 6 shows a main part of the knitting of the three-dimensional knitted fabric of FIGS. 1 and 2, and Steps 1 to 6 are repeated. Step 0 is a preparation stage in which stitches are locked to the needles A to X and a to x of the front needle bed FB and the rear needle bed BB. In steps 1 and 2, the knitted fabrics on the front and back sides are connected by, for example, tucking the connecting yarns. The V symbol in Step 3, Step 4 and the like represents a tack eye, and symbols such as ▽ and ▼ represent yarn feeders. Here, three yarn feeders are used for the connecting yarn, the front knitted fabric and the back knitted fabric. . In step 3, for example, stitches are formed on every other needle within the knitting width on the back knitted fabric, and in step 4, stitches are formed on all the needles within the knitting width on the front knitted fabric. In FIG. 6, “◯” represents a stitch knitted in the previous course, and “●” represents a stitch knitted in the course. Steps 5 and 6 are the same as steps 3 and 4. Through Step 1 to Step 6, a stitch twice as large as the back knitted fabric is formed in the front knitted fabric along the length direction. As a result, the front knitted fabric tends to expand more than the back knitted fabric. As described above, instead of the number of stitches, the size of the stitches may be changed between the front knitted fabric and the back knitted fabric, or the back knitted fabric may be knitted with heat shrink yarn. Then, steps 1 to 6 are repeated. The three-dimensional knitted fabric knitted in this way is provided with two layers of a front knitted fabric and a back knitted fabric, and they are connected by a connecting yarn. At the end of knitting, the front and back knitted fabrics are bound, Make sure that the knitted fabric is not broken. In addition to the tack, the connecting yarn may miss most of the needles, and the stitches may be formed only with some of the needles on both the front and back needle beds.

  FIG. 7 shows a mechanism for three-dimensional deformation of the knitted fabric, and an example in which the three-dimensional knitted fabric 10 of FIGS. 1 and 2 is knitted by the flat knitting machine 2 will be described. Reference numeral 12 denotes a back knitted fabric, reference numeral 14 denotes a front knitted fabric, and the front knitted fabric 14 has, for example, a larger number of eyes than the back knitted fabric 12. The knitted fabrics 12 and 14 are connected by a connecting thread 16. Further, the direction parallel to the needle bed 4 during knitting is the width direction, and the direction perpendicular thereto is the length direction. When the three-dimensional knitted fabric 10 is removed from the flat knitting machine 2, the front knitted fabric 14 has a greater number of stitches in the length direction than the back knitted fabric 12, so that it tends to spread in the length direction. As shown in the lower part of FIG. 7, a three-dimensional knitted fabric 10 is formed such that the front knitted fabric 14 appears on the inner side, as shown in the lower part of FIG. 7. Reference numeral 17 denotes a set-up portion, and 18 denotes a knitting end portion, which are opposed in parallel along the C-shaped opening.

  A knitted fabric pattern for knitting the three-dimensional knitted fabric of FIG. 3 is shown in FIG. 20 is a three-dimensional knitted fabric, 22 is a back knitted fabric, 24 is a front knitted fabric, 27 is a set-up portion, 28 is a knitting end portion, and 29 and 30 are turn-back portions. The size in the length direction of the back knitted fabric 22 is made smaller than the size in the length direction of the front knitted fabric 24, knitting is started at the set-up portion 27, and only the hatched range is knitted at the turn-back portion 29. The stitches of the set-up portion 27 are held on the needle. Then, only the hatched range is knitted in the turn-back portion 30, and the stitches are held on the needles on the right side. Then, the knitting end portion 28 is bound so that the stitches of the front knitted fabric 24 and the back knitted fabric 22 are overlapped, and the knitting is completed. Then, as shown in FIG. 3 and the like, a three-dimensional knitted fabric having a spiral C-shaped opening is obtained.

  When the three-dimensional knitted fabric of FIG. 4 is knitted, the three-dimensional knitted fabric 40 of FIG. 9 is knitted, 43 is a set-up portion, 47 is a knitting end portion, and in the three-dimensional knitted fabric 40, the set-up portion 43 and the knitting end portion 47 face each other. . 44 is a front knitted fabric, and the back knitted fabric is hidden inside the curved three-dimensional knitted fabric 40. When the upper three-dimensional knitted fabric 40 of FIG. 9 is knitted and removed from the needle bed, it bends as shown in the lower part of FIG. Since the length direction size of the front knitted fabric 44 is larger than the length direction size of the back knitted fabric, the three-dimensional knitted fabric 40 bends in a C shape along the length direction. Since there are a plurality of turn-back portions 45, the C-shaped diameter changes. While knitting the turn-back portion 45, the stitches along the line segment 48 and the like are held on the needle, and when the knitting of the turn-back portion 45 is finished, the stitches along the line segment 48 and the like are followed by the line segment 49 and the like. Knitting stitches. For this reason, there is no gap between the line segments 48 and 49. 9 is added to a portion indicated by a chain line, a three-dimensional knitted fabric in which the C-shaped diameter changes as small-large-small like the chain line at the bottom of FIG.

When the size along the width direction of the three-dimensional knitted fabric is made different between the front and back knitted fabrics by increasing or decreasing the number of stitches within the knitting width, the three-dimensional knitted fabric is bent along the width direction while being bent in a C shape. Also tries to bend. The side of the knitted fabric having a large size in the width direction is the outside, and the side of the knitting fabric having a small size in the width direction is the inside. If it does in this way, the solid knitted fabric which bent in the width direction by the C shape can be knitted, and it can be made to fit in the bent part of a pipe.

2 Flat knitting machines 4, 6 Needle bed 8 Carriage 9 Racking motors 10, 20, 40 Solid knitted fabrics 12, 22 Back knitted fabrics 14, 24, 44 Front knitted fabric 16 Connecting yarns 17, 27, 43 Set-up portions 18, 28, 47 Knitting end portions 29, 30 Return portion 45 Return portion

Claims (5)

A method of knitting a three-dimensional knitted fabric with a flat knitting machine having at least a pair of front and back needle beds,
The front knitted fabric and the back knitted fabric on one side of the pair of needle beds are knitted so that the length direction size of the front knitted fabric is larger than the length direction size of the back knitted fabric. By connecting with the knitted fabric with a connecting thread,
A method for knitting a three-dimensional knitted fabric, characterized by knitting a three-dimensional knitted fabric that is bent in a C-shape along the length direction and in which a set-up portion and a knitting end portion face each other.   The length of the front knitted fabric by increasing the number of stitches along the length direction in the front knitted fabric than in the back knitted fabric and / or making the stitch size of the front knitted fabric larger than the stitch size of the back knitted fabric. The knitting method for a three-dimensional knitted fabric according to claim 1, wherein the direction size is larger than the length direction size of the back knitted fabric.   By knitting a part of the front knitted fabric and the back knitted fabric by turn back knitting, the solid knitted fabric in which the set-up portion and the knitting end portion of the solid knitted fabric are not parallel to the C-shaped axis, or the C-shaped diameter changes. The method for knitting a three-dimensional knitted fabric according to claim 1 or 2, wherein the three-dimensional knitted fabric is knitted. A three-dimensional knitted fabric knitted by a flat knitting machine,
It consists of connecting yarn that connects the front knitted fabric and the back knitted fabric, and the front knitted fabric and the back knitted fabric, and the length direction size of the front knitted fabric is larger than the length direction size of the back knitted fabric. A three-dimensional knitted fabric that bends in a C shape and has a set-up portion and a knitting end portion facing each other.   A pipe cover comprising the three-dimensional knitted fabric according to claim 4.