JP2009052157A - Partially different hardness elastic warp knitted fabric - Google Patents

Abstract

A partially different hardness elastic warp in which the elongation stress at 10% elongation in the knitting width direction is partially changed in the knitting growth direction without changing the specification of the elastic yarn knitted as a knitting warp or insertion yarn in the knitting process. Get a knitted fabric.
A knitting warp yarn 11 forming a knit loop 15 and a plurality of rows of wales 14a, 14b, 14c,... Are moved and knitted without forming a knit loop, and locked to the knit loop of the knitting warp yarn. The warp knitted fabric is knitted with the inserted yarn 12. An elastic thread is used as the insertion thread. The insertion yarn knitting density P shown as the number of the courses 13 in which the insertion yarn moves in the knitting width direction X per unit length in the knitting growth direction Y and the knitting width direction in the course 13 in which the insertion yarn is knitted. The elongation stress at the time of 10% elongation in the knitting width direction is changed in the knitting growth direction in accordance with the insertion yarn knitting amount R indicated by the product of the number L of the wale rows moving in the knitting direction.
[Selection] Figure 1

Description

  The present invention relates to a support for a frame of a body support device used indoors, outdoors, in a car, etc. to support a body such as a seat, chair, stool, backrest, leg rest, seat, sofa, bed, etc. It is related with the elastic fabric for body support used in order to construct cushion surfaces, such as a seating surface and a backrest surface, which are stretched between the arm and the support and elastically support the body.

  The elastic fabric will undulate and deform according to the undulations of the body it touches, and the body pressure applied to the elastic fabric will be evenly distributed with the body weight being a pressing force, making it feel pain when used for a long time. In order not to induce pressure ulcers on the part touching the elastic fabric, a body pressure dispersion type partially different hardness elastic fabric in which the elongation stress at the time of 10% elongation of the elastic fabric is partially changed is known ( For example, see Patent Document 1).

  In other words, in an elastic woven fabric that can change the weaving yarn every time the weaving process is carried out in the weaving process, several types of elastic yarns with different specifications such as the fineness (thickness) weaved as the weaving weft and the fiber material are selectively used for each weaving process. In this case, the elongation stress at the time of 10% elongation in the weaving width direction (X) can be partially changed in the weaving direction (Y) (see, for example, Patent Document 1).

  In an elastic weft knitted fabric that can change the yarn feeder that leads the knitting weft yarn to the knitting needle in the knitting process, several types of elastic yarns with different specifications such as fineness (thickness) and fiber material to be knitted as the knitting weft yarn are selectively changed By knitting, the elongation stress at the time of 10% elongation in the knitting width direction (wale direction X) can be partially changed in the knitting growth direction (course direction Y) (see, for example, Patent Document 1).

Japanese Patent No. 3928178

However, in the elastic warp knitted fabric, both the knitting warp and the insertion yarn constituting the knitted warp are introduced from the beam into the heel and supplied from the heel needle to the knitting needle for knitting.
The kite is equipped with countless kite needles according to the number of waling rows of the warp knitted fabric, and it is possible to replace the kite in which countless knitting warp yarns or insertion yarns are introduced with another kite in the knitting process. Absent.
Accordingly, in an elastic warp knitted fabric, the fineness (thickness) of the elastic yarn to be knitted as a knitting warp or insertion yarn, the specification of the fiber material, etc. cannot be selectively changed in the knitting process, and the knitting width direction (the wale direction X) It is not possible to obtain a partially different hardness elastic warp knitted fabric in which the elongation stress at the time of 10% elongation is partially changed in the knitting growth direction (course direction Y).

  Accordingly, the present invention provides an elongation at 10% elongation in the knitting width direction (the wale direction X) without changing the fineness (thickness) of the elastic yarn to be knitted as a knitting warp or insertion yarn or the specification of the fiber material in the knitting process. It is an object to obtain a partially different hardness elastic warp knitted fabric in which stress is partially changed in the knitting growth direction (course direction Y).

The partially different hardness elastic warp knitted fabric according to the present invention includes: (a) a knitted warp yarn 11 that is knitted to form a knit loop 15; and a plurality of rows of wales 14a, 14b, 14c without forming a knit loop. Are knitted by at least two types of yarns with an insertion yarn 12 that is knitted by moving the yarn and locked to the knit loop 15 of the knitting warp yarn 11,
(B) The insertion yarn 12 is an elastic yarn having an elastic recovery rate of 90% or more after 15% elongation,
(C) Insert yarn knitting density P (unit: course) shown as the number of courses 13 in which the insertion yarn 12 moves in the knitting width direction X per unit length (25.4 mm) in the knitting growth direction Y Number / 25.4 mm) and the number of wales L (unit: number of wales) corresponding to the distance L moved in the knitting width direction X in the course 13 in which the insertion yarn 12 is knitted (P × L). The inserted yarn weaving amount R changes in the knitting growth direction Y,
(D) The elongation stress at the time of 10% elongation in the knitting width direction X changes in the knitting growth direction Y according to the insertion yarn knitting amount R.

  The insertion yarn 12 knitted without moving between the plurality of rows of wales 14a, 14b, 14c,... To form a knitted loop has a knitting width between the moved rows of wales 14a, 14b, 14c,. In the course 13b, which is a straight yarn continuous straight in the direction X and the insertion yarn knitting density P is dense, that is, the course 13b having a narrow course interval Hb, the insertion yarn per unit length in the knitting growth direction Y. Since the number of the 12 straight yarn portions is also large, the elongation stress at the time of 10% elongation in the knitting width direction X in the dense course 13b is the course 13a where the insertion yarn knitting density P is coarse, that is, the course interval Ha. It becomes stronger than the elongation stress at the time of 10% elongation in the knitting width direction X in the wide course 13a.

If the distance that the insertion yarn 12 moves in the knitting width direction X, that is, the number L of wales that intersect in the movement process is large, the straight yarn that continues straight in the knitting width direction X of the insertion yarn 12 in the moving course 13b. The length Lb of the straight portion of the insertion yarn 12 that is straight and continuous in the knitting width direction X in the course 13a having a small number of wales L that the insertion yarn 12 moves and crosses in the knitting width direction X. Longer than La.
Therefore, the amount of knitting of the insertion yarn 12 in the course 13b having a large number of wales L that intersects when the insertion yarn 12 moves in the knitting width direction X is equal to the amount of wales that the insertion yarn 12 moves and intersects in the knitting width direction X The amount is larger than the knitting amount of the insertion yarn 12 in the course 13a having a small number L.
The elongation stress at the time of 10% elongation in the knitting width direction X increases and decreases in proportion to the knitting amount of the insertion yarn 12, so the knitting width direction in the course 13b where the number of wales to which the insertion yarn 12 moves is large. The elongation stress at 10% elongation in X is stronger than the elongation stress at 10% elongation in the knitting width direction X in the course 13a where the number of wales to which the insertion yarn 12 moves is small.

  In this manner, the elongation stress at the time of 10% elongation in the knitting width direction X increases in proportion to the insertion yarn knitting density P and the movement distance (the number of wales) L of the insertion yarn. The elongation stress at the time of 10% elongation in the knitting width direction X increases in proportion to the insertion yarn knitting amount R shown as).

In the warp knitting machine, the reed can be reciprocated in the knitting width direction X by a servo motor (the wobbling motion) during the knitting process, and the insertion yarn 12 moves in the knitting width direction X according to the movement amount of the reed. Thus, the number L of crossing wales can be controlled.
In the warp knitting machine, the winding roll for pulling out the warp knitted fabric to be knitted in the knitting process can be rotated by a servo motor, and the course interval H of the warp knitted fabric is set according to the rotational speed of the take-up roll. Since it changes, the insertion yarn weaving density P can be controlled by the rotational speed of the winding roll.

  Therefore, according to the present invention, the insertion yarn weaving amount R shown as the product (P × L) of the insertion yarn weaving density P and the insertion yarn moving wale number L is changed to 10% in the knitting width direction X. It is possible to obtain the body support partially different hardness elastic warp knitted fabric 16 in which the elongation stress at the time of elongation is partially different in the knitting growth direction Y.

The insertion yarn knitting density P can be controlled by a servo motor that reciprocally drives the wrinkle in the knitting width direction X (swinging motion), and the warp knitted fabric is pulled out with respect to the moving yarn number L of the insertion yarn. It can be controlled by a servo motor that rotates the winding roll.
However, the means for controlling the insertion yarn weaving density P and the number of moving wales L of the insertion yarn is not limited to the servo motor, but a chain cam mechanism, a gear transmission mechanism, a transmission pulley mechanism, or the like is applied. You can also.

The insertion yarn knitting amount R can be gradually changed so that the amount of change ΔR draws a gentle displacement curve with the knitting growth direction Y as a base axis.
For example, as shown in FIG. 2, a piece of partially different hardness elasticity that is continuous from the backrest portion 21 to the waistrest portion 22 between the support rods 23 and the support rods 23 facing the left and right of the frame of the seat chair or the chair 20. When the warp knitted fabric 16 is stretched, the insertion thread knitting amount Q is gradually increased or decreased before and after the vertebra corresponding portion 24 of the backrest portion 21, and the insertion yarn knitting amount is increased in the sacrum corresponding portion 25 of the waist rest portion 22. Q can be reduced, and the insertion thread knitting amount Q can be gradually increased from the sacrum corresponding portion 25 to the thigh corresponding portion 26 which is the front end edge portion of the waistrest portion 22.

The elongation stress at the time of 10% elongation in the knitting width direction X is preferably set to 100 to 300 N / 5 cm or more. However, when an elastic yarn is also applied to the knitting warp yarn 11, the elastic yarn is particularly knitted to form the knit loop 15. When the knit loop 15 of the knitting warp 11 is entangled with the chain stitch formed in the course direction (knitting growth direction Y) as the auxiliary elastic yarn for the warp 11 without forming the knit loop, the auxiliary elastic yarn is used. Thus, the tensile stress at the time of 10% elongation in the knitting growth direction Y is secured, and the partially different hardness elastic warp knitted fabric 16 can be tensioned and tensioned in the knitting growth direction Y, so that the knitting width direction X The elongation stress at 10% elongation in can be set to 15 to 100 N / 5 cm, that is, 100 N / 5 cm or less.
In that case, the elongation stress Fc at the time of 10% elongation in the knitting growth direction Y secured by the auxiliary elastic yarn is set to 15 N / 5 cm or more, and the elongation stress Fw at the time of 10% elongation in the knitting width direction X is knitted. It is stronger than the elongation stress Fc at the time of 10% elongation in the length direction Y (Fw> Fc).

As the knitting warp yarn 11, the insertion yarn 12, and the entanglement yarn (auxiliary elastic yarn), the single fiber fineness is 150 dtex or more, and the elongation stress at 10% elongation is 0.1 cN / dtex or more, preferably 0.2-0. An elastic monofilament yarn of 8 cN / dtex, more preferably 0.2 to 0.4 cN / dtex, for example, a polyether ester elastic monofilament yarn may be used, and a crimped polyester multifilament yarn may be used for the multifilament yarn.
The maximum total fineness of the elastic yarn may be 2000 dtex or less.

The partially different hardness elastic warp knitted fabric 16 can be a front and back double warp knitted fabric by a single raschel warp knitting machine or a tricot warp knitting machine.
In that case, knitting is performed by the knitting warp yarn 11 that forms a knit loop, and the insertion yarn 12 that is an elastic yarn that is knitted by moving between a plurality of rows of wales 14a, 14b, 14c... Without forming a knit loop, The partially different hardness elastic warp knitted fabric (16) whose insertion yarn knitting amount R has changed in the knitting growth direction Y is used as an elastic base back knitted fabric, and the surface of the elastic base back knitted fabric has a single fiber fineness of 10 dtex or less. A knit loop composed of a large number of fibers and integrated with the knit loop 15 of the knitting warp yarn 11 with the multifilament yarn thicker than any of the knitting warp yarn 11 and the insertion yarn 12 of the elastic base back knitted fabric as the front yarn. It is preferable to form a knit and project a surface sinker loop on the surface of the elastic base back knitted fabric.
The knitting structure constituted by the surface yarn on the surface of the elastic base back knitted fabric is a mesh knitting structure having a thread-cutting mesh hole having an opening area of 1 mm ² or more knitted by a reed in which the surface yarn is partially removed. The stretch elasticity of the elastic base back knitted fabric is not hindered by the knitting structure of the front yarn.

The partially different hardness elastic warp knitted fabric 16 can also be knitted double-sided by connecting the front and back fabrics with a connecting yarn using a double raschel warp knitting machine.
In that case, as for the back fabric, the knitting warp yarn 11 forming a knit loop and the insertion yarn which is an elastic yarn knitted by moving between a plurality of rows of wales 14a, 14b, 14c... Without forming a knit loop. 12 is a partially different elastic elastic warp knitted fabric whose insertion yarn knitting amount R is changed in the knitting growth direction Y, and the front cloth does not hinder the stretch elasticity of the partial different hardness elastic backing cloth (16). A mesh warp knitted fabric having a threaded mesh hole having an opening area of 1 mm ² or more is used.

The insertion yarn knitting amount R changes in the knitting growth direction Y in part of the knitting width direction X of the elastic backing cloth 16, for example, as shown in FIG. In the elastic warp knitted fabric 16 continuously stretched between the backrest 23 and the support 23 from the backrest portion 21 to the waistrest portion 22, only the insertion yarn knitting amount R of the central portion 27 is knitted. It is also possible to change it partially in the length direction Y and make the insertion yarn knitting amount R of the left and right edge portions 28, 28 constant without changing in the knitting growth direction Y.
In that case, all of the insertion thread 12c of the central portion 27 is inserted into the heel needle of another ridge different from the insertion thread 12 of the left and right end edge portions 28 and 28, and the sacrum corresponding portion located in the knitting growth direction Y 25, only the number of movement wales L in the knitting width direction X of the heel through which the insertion thread 12c is inserted is changed, and the insertion thread knitting amount R of the insertion thread 12c is increased or decreased at the sacrum corresponding portion 25.

  FIG. 4 shows an insertion thread at the boundary between the sacrum corresponding portion 25 and the left and right edge portions 28 and 28, and the boundary between the sacral corresponding portion 25 and the backrest portion 21 through the thigh corresponding portion 26 that are front and rear of the sacral corresponding portion 25. The state of change of the knitting amount R is illustrated, and the movement distance L in the knitting width direction X of the insertion yarn 12 at the left and right end edge portions 28 and 28 is the backrest portion 21 from the front end edge portion of the waist rest portion 22. It is constant until it reaches the upper edge part. In the elastic warp knitted fabric 16 shown in FIGS. 3 and 4, the course interval H (inserted yarn knitting density P) is determined from the front edge portion of the waist rest portion 22 in both the central portion 27 and the left and right end edge portions 28. It is constant until it reaches the upper end edge portion of the waistrest portion 22.

  While knitting an elastic base warp knitted fabric using a polyether ester elastic monofilament yarn having a fineness of 300 dtex as an insertion yarn 12 and a knitting warp yarn 11, forming a knit loop integral with the knit loop 15 of the knitting warp yarn 11 and having a total fineness of 450 dtex Polyester multifilament yarn is knitted as the front yarn, the mesh warp knitted fabric with the surface yarn is overlapped on the sinker loop surface of the elastic base warp knitted fabric, and the elastic base warp knitted fabric and the mesh warp knitted fabric are integrated into the front and back A double part different hardness elastic warp knitted fabric was knitted.

The front yarns are divided into two groups, a first group of front yarns and a second group of front yarns. The front yarns are divided into the first and second yarns, and are introduced to each one needle. The thread 15 was inserted, and the subsequent three needles were used as thread removers, and the front thread 15 was inserted at a rate of 1 for every 4 needles, and the thread was removed at a rate of 3 for every 4 needles.
The knitting warp yarn 11 was introduced into the third kite and inserted into one kite needle, and the subsequent one kite needle was used as a thread remover and inserted every other kite needle.
The insertion thread 12 is divided into two groups, a first group of insertion thread 12a and a second group of insertion thread 12b, and is introduced into the fourth and fifth collars (back collar), and each is inserted into one collar needle. The thread 11 was inserted, and one succeeding needle was used as a thread remover, and every other needle was inserted.

In the first heel (front heel) and the second heel, the knitting structure of the front yarn following 3-4 / 1-0 / 3-4 / 1-0 /.
The third kite knits the knitting structure of the knitting warp yarn 11 that follows 1-0 / 0-1 / 1-0 / 0-1 /.
The 4th kite knits the knitting structure of the insertion yarn 12a which continues with 0-0 / 4-4 / 0-0 / 4-4 /...
The fifth kite (back kite) knitted the insertion yarn 12b knitting structure that continued with 4-4 / 0-0 / 4/4 / 0-0 /.

  In the knitting process, the rotation speed of the take-up roll that pulls out the warp knitted fabric is changed by a servo motor, and the part 26 corresponding to the thigh is knitted with an insertion thread knitting density of 20 courses / 25.4 mm, and the subsequent 8 courses are knitted. Knit with 19 thread / 25.4 mm insertion thread knitting density, then knitting 8 courses with 18 course / 25.4 mm insertion thread knitting density, followed by 8 courses with 17 course / 25.4 mm Knitting with an insertion yarn knitting density of 15 mm, and subsequent 8 courses knitted with an insertion yarn knitting density of 16 courses / 25.4 mm, followed by 8 courses with an insertion yarn knitting density of 15 courses / 25.4 mm. Knitting with a knitting density of 14 courses / 25.4 mm and an insertion thread knitting density of about 30 cm, followed by 8 courses with 15 courses / 25.4 mm of knitting insertion threads Knitting with the insertion yarn weaving density of 16 courses / 25.4mm, and the subsequent 8 courses knitting with the insertion yarn weaving density of 17 courses / 25.4mm, followed by Eight courses are knitted with an insertion thread braid density of 18 courses / 25.4 mm, and the intermediate part between the waist rest part 22 and the backrest part 21 is followed by an insertion thread braid density of 19 courses / 25.4 mm. Knit 10cm, then knitting 8 courses at 20 courses / 25.4mm insertion thread knitting density, and then knitting 8 courses at 21 courses / 25.4mm insertion thread knitting density, followed by 8 courses are knitted with 22 courses / 25.4 mm insertion thread knitting density, 8 courses are knitted with 23 courses / 25.4 mm insertion thread knitting density, and the following vertebrae corresponding parts 24 are 24 course/ About 5cm knitting with 5.4mm insertion yarn knitting density, followed by 8 courses knitting with 23 course / 25.4mm insertion yarn knitting density, followed by 8 courses with 22 course / 25.4mm Knitting at the insertion yarn weaving density, knitting the subsequent 8 courses at the insertion yarn weaving density of 21 course / 25.4mm, and the subsequent 8 courses at the insertion yarn weaving density of 20 course / 25.4mm Knitting, and then knitting the upper end edge portion of the backrest portion 21 with an insertion thread knitting density of 19 courses / 25.4 mm for about 30 cm, and continuing from the waist rest portion 22 to the backrest portion 21 with partially different hardness elastic warp Organized the ground.

A piece of partially different hardness elastic warp knitted fabric 16 continuous from the waist rest portion 22 to the backrest portion 21 was stretched between the struts 23 and the struts 23 facing the left and right of the frame of the chair 20.
The sitting comfort of the chair was extremely comfortable.

It is an enlarged plan view of the elastic warp knitted fabric according to the present invention. It is a perspective view in the use condition of the elastic warp knitted fabric which concerns on this invention. It is a perspective view in the use condition of the elastic warp knitted fabric which concerns on this invention. It is an enlarged plan view of the elastic warp knitted fabric according to the present invention.

Explanation of symbols

11: Knitting warp thread 12: Insertion thread 13: Course 14: Wale row 15: Knit loop 16: Partially different hardness elastic warp knitted fabric 20: Chair 21: Backrest part 22: Waist rest part 23: Support 24: Vertebral corresponding part 25: Sacral corresponding part 26: Thigh corresponding part 27: Center part 28: Edge part X: Knitting width direction (Wale direction)
Y: Knitting growth direction (course direction)

Claims (1)

(A) A knitted warp yarn (11) which is knitted to form a knit loop (15), and is knitted while moving between a plurality of rows of wales (14a, 14b, 14c...) Without forming a knit loop. The knitting warp yarn (11) is knitted by at least two types of yarns with the insertion yarn (12) locked to the knit loop (15),
(B) For the insertion thread (12), an elastic thread having an elastic recovery rate of 90% or more after 15% elongation is used,
(C) Insert yarn knitting density (P) shown as the number of courses (13) in which the insertion yarn (12) moves in the knitting width direction (X) per unit length in the knitting growth direction (Y) ) And the number (W) of wales moving in the knitting width direction (X) in the course (13) in which the insertion yarn (12) is knitted (P × L). ) In the knitting growth direction (Y),
(D) Partially different hardness elastic warp knitted fabric in which the elongation stress at the time of 10% elongation in the knitting width direction (X) changes in the knitting growth direction (Y) according to the insertion yarn knitting amount (R) .

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