TWI796313B - Latch needle - Google Patents

Abstract

The present invention provides a latch needle capable of suppressing sudden fluctuations in frictional resistance. The latch needle comprises: a needle body (11), which has a hook-shaped hook portion (14) at the top; and a tongue portion (20), which is more rotatably mounted on the needle body (11), and can be connected part (14) is in contact with and separated from each other, and is formed so that in the locked state where the tongue part (20) abuts against the hook part (14), the loop of the knitting yarn (S) runs along the tongue part (20 ), the back surface (20a) of the needle main body (11) has a concave shape (11b) on the side opposite to the surface facing the tongue (20), that is, the back surface (11a), When viewing the latch needle (10) in the locked state from the side along the axial direction (A), the concave shape (11b) is provided at least to the needle body (11) and the tongue ( 20) to the position where the back side (20a) intersects.

Description

Latch needle

The present invention relates to a latch needle having a hook portion and a tongue portion at the tip, and in detail, relates to a latch needle that does not generate sudden knitting resistance.

Currently, latch needles are widely used in circular knitting machines and flat knitting machines as needles for knitted fabrics (for example, refer to Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Laid-Open Utility Show No. 61-168188

When such a latch needle is used to form a mesh, the tip of the latch needle is pulled out from the loop of the knitting yarn. Specifically, in a knock over state where the tongue is in contact with the hook, the loop of the knitting yarn is released toward the tip end side of the needle along the back of the tongue. At this time, if the stitches of the knitting yarn are small, the stitches may press against the covered portion between the tongue and the hook, resulting in increased frictional resistance between the latch needle and the yarn. In addition, sudden fluctuations in frictional resistance cause loads on yarns and needles, causing damage to fabrics and needles.

Therefore, an object of the present invention is to provide a latch needle capable of suppressing sudden fluctuations in frictional resistance.

This invention was made in order to solve the said subject, and it has the following characteristics.

The invention described in claim 1 is a latch needle comprising: a needle body having a hook-shaped hook portion at the tip; The hook portion contacts and separates, and the latch needle is characterized in that in a locked state where the tongue portion and the hook portion are in contact, the loop of the knitting yarn is separated from the back side of the tongue portion toward the tip side, The needle main body has a concave shape on the surface opposite to the surface facing the tongue, that is, the back surface. When the latch needle in the locked state is viewed from the side along the axial direction, the concave shape is at least It is installed until the position where the needle main body intersects with the back surface of the tongue.

The invention described in claim 2 is based on the characteristic point of the invention described in claim 1 above, wherein the concave shape is a shape in which the back surface of the needle main body is curved inward.

The invention described in claim 3 is characterized in that the concave shape is a chamfered shape formed on the back surface of the needle body, in addition to the characteristic point of the invention described in claim 1 or 2 above.

The invention described in claim 4 is based on the characteristic point of the invention described in any one of claims 1 to 3 above, wherein the back surface of the needle main body is gradually inclined in a direction in which the tip becomes thinner until the tip is reached. .

The invention described in claim 5 is based on the characteristic point of the invention described in any one of the above-mentioned claims 1 to 4, wherein the shortest yarn stretched around the needle main body and the tongue is When the length of the yarn is the stitch length of the knitting yarn, the stitch length of the knitting yarn gradually increases as the stitch of the knitting yarn moves toward the tip side along the back surface of the tongue until it is detached from the tongue. increase rather than decrease.

In the invention described in claim 1, as described above, the needle main body has a concave shape on the surface opposite to the surface facing the tongue, that is, the back surface. When the latch needle in the locked state is viewed from the side along the axial direction, The concave shape is provided at least as far as the point where the needle body and the back surface of the tongue intersect. With such a configuration, it is possible to prevent the frictional resistance from fluctuating abruptly when the loops of the knitting yarn are looped over the tongue. That is, in the conventional structure, when the stitches of the knitting yarn are released toward the front end side along the back of the tongue in the locked state, when the stitches of the knitting yarn are caught on the back of the tongue and start to slide, the knitting yarn The coil of the wire rapidly expands, and the frictional resistance fluctuates rapidly. For this point, adopt the present invention, owing to be provided with concave shape, so that the loop of the knitting yarn expands gently without sharp expansion even just after being put on the tongue, so the frictional resistance between the latch needle and the yarn is stable, and beautiful fabrics can be knitted. In addition, since the knitting resistance is small, the power consumption of the knitting machine can be suppressed, and the breakage of the needle can be suppressed.

In addition, in the invention described in claim 2, as described above, the concave shape is a shape in which the back surface of the needle main body is curved inward. According to such a structure, when the loop of the knitting yarn slides on the back surface of the tongue, since the shape of the loop does not greatly change, fluctuations in frictional resistance can be suppressed.

In addition, in the invention described in claim 3, as described above, the concave shape is a chamfered shape formed on the back surface of the needle main body. With such a structure, it is possible to prevent the loops of the knitting yarn from being enlarged rapidly, and to prevent the yarn from being worn out at the corners of the back surface of the needle main body.

In addition, in the invention described in claim 4, as described above, the back surface of the needle main body is gradually inclined in a direction in which the tip becomes thinner until the tip is reached. With such a structure, the loop of the knitting yarn can be easily detached from the tip of the latch needle.

In addition, in the invention described in claim 5, as described above, the loop length of the knitting yarn gradually increases while the loop of the knitting yarn moves toward the tip side along the back surface of the tongue until it is separated from the tongue. decrease. With such a structure, since the stitch length does not both increase and decrease until the stitch is detached from the top end of the latch needle, the stitch length can be increased gently, the sharp fluctuation of frictional resistance can be suppressed, and the knitting yarn can The loop of the needle is smoothly detached from the tip of the latch needle.

10:Latch needle

11: Needle body

11a: back

11b: concave shape

13: needle bar

14: Hook

14a: Top

15: Cheek

16: Connecting part

20: Tongue

20a: back

20b: Groove

20c: Yamabe

20d: top slope

20e: rear end inclined part

25: rotating shaft

S: knitting yarn

X: cross position

A: Axial

Fig. 1 is a diagram showing the locked state of the latch needle of the first embodiment, Fig. 1(a) is a graph showing the increase and decrease of the stitch length, Fig. 1(b) is a partially enlarged side view of the tip portion, (c) of FIG. 1 is a cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 2 is a diagram showing the opening (clearing) state of the latch needle of the first embodiment, Fig. 2(a) is a graph showing the increase and decrease of the stitch length, and Fig. 2(b) is a partially enlarged side of the tip end View, (c) of Figure 2 is A cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 3 is a table showing stitch lengths of the latch needle of the first embodiment.

Fig. 4 is a diagram showing the locked state of the latch needle of the second embodiment, Fig. 4(a) is a graph showing the increase and decrease of the stitch length, Fig. 4(b) is a partially enlarged side view of the tip portion, (c) of FIG. 4 is a cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 5 is a diagram showing the open state of the latch needle of the second embodiment, Fig. 5(a) is a graph showing the increase and decrease of the stitch length, Fig. 5(b) is a partial enlarged side view of the tip portion, Fig. (c) of 5 is a cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 6 is a table showing stitch lengths of the latch needles of the second embodiment.

Fig. 7 is a diagram showing the locked state of the conventional latch needle, Fig. 7 (a) is a graph showing the increase and decrease of the stitch length, Fig. 7 (b) is a partial enlarged side view of the top end, Fig. 7 (c) is a cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 8 is a diagram showing the open state of the conventional latch needle, Fig. 8(a) is a graph showing the increase and decrease of the stitch length, Fig. 8(b) is a partial enlarged side view of the tip end, Fig. 8( c) is a cross-sectional view taken along a plane perpendicular to the axial direction.

Fig. 9 is a table showing stitch lengths of conventional latch needles.

Embodiment of the present invention is described as follows with reference to accompanying drawing: The latch needle 10 of this embodiment is used as a needle for knitting knitwear, and is installed on a circular knitting machine or a flat knitting machine. As shown in FIG. shaped hook 14 ; The tongue needle 10 is opened and closed by the tongue part 20, and a cloth is knitted through processes of yarn supply and stitch formation.

Specifically, the latch needle 10 moves forward and backward along the axial direction A under the action of the knitting machine, and alternately repeats the tongue portion 20 and the hook portion 14 shown in (b) of FIG. Cloth is woven from the abutted locked state and the open state shown in FIG. 2( b ) in which the tongue 20 is separated from the hook 14 and the hook 14 is opened.

For example, by moving the latch needle 10 along the axial direction A under the action of the knitting machine, the hook portion 14 in the open state enters the loop of the knitting yarn S, and on the opposite side of the loop, the hook of the latch needle 10 Section 14 hooks up the yarn. Afterwards, by moving the latch needle 10 in the retracting direction, when the hook portion 14 is separated from the stitch, the tongue portion 20 is closed by the stitch to be in a locked state, and the stitch of the knitting yarn S runs along the back surface of the tongue portion 20. 20a is detached toward the tip side. Through this series of operations, the yarn can be passed through the loops to form a mesh. In addition, when the tongue needle 10 is moved in the entry direction again, the tongue portion 20 is opened by the tension of the yarn hooked by the hook portion 14 to be in an open state. The latch needle 10 in the open state is separated from the hooked yarn and enters the next stitch.

The needle main body 11 of the present embodiment includes: a needle bar 13, which is rod-shaped; a cheek 15, which is provided on the top end side of the needle bar 13, for supporting the tongue 20; and a connecting part 16, which is provided on the cheek 15. and between the hook 14. The cheek 15 is provided with a rotational shaft 25 which pivotally supports the tongue 20 so that the tongue 20 is rotatable. The rotation shaft 25 can be formed by, for example, a pin, a rivet, or the like. Moreover, as shown in FIG. 1(b) etc., the connection part 16 is formed in the shape with a tapered tip in a side view. Furthermore, a hook-shaped hook portion 14 bent into a “J” shape is provided at the tip of the connection portion 16 . As shown in FIG. 1(c) etc., the thickness of the tip 14a of the hook portion 14 is formed thinner than that of the connection portion 16 and the needle bar 13, and can enter the groove portion 20b of the tongue portion 20 (described later).

In addition, in this embodiment, the portion closer to the distal end than P1 shown in (c) of FIG. A portion is the cheek portion 15, and a portion on the rear end side of P7 is the needle bar 13.

In addition, in the present embodiment, the rear end portion of the tongue portion 20 is rotatably held by the cheek portion 15 of the needle main body 11 so as to be sandwiched from both sides. In addition, a groove portion 20b having a substantially “V”-shaped cross section is provided at the tip end of the tongue portion 20, and the tongue portion 20 and the hook portion 14 can be abutted by using the groove portion 20b to receive the tip end 14a of the hook portion 14. Connected lock state.

The back surface 20a (the surface opposite to the surface facing the needle body 11 ) of the tongue portion 20 is mainly composed of two inclined surfaces. That is, the rear end inclined portion 20e formed on the rotation shaft 25 side and the front end inclined portion 20d formed on the distal side of the rear end inclined portion 20e. The rear end inclined portion 20e is formed as a steeper slope than the front end inclined portion 20d in the locked state. Moreover, between this rear-end inclination part 20e and front-end inclination part 20d, the gentle mountain part 20c formed in the curved surface (for example, R shape) is provided. Therefore, the back surface 20a of the tongue 20 is It is formed so that the inclination angle changes on both sides of the mountain part 20c. When the stitches of the knitting yarn S escape toward the front end side along the back surface 20a of the tongue portion 20 in the locked state, the stitches first slide along the rear end inclined portion 20e, and then pass through the mountain portion 20c and slide along the top end inclined portion 20d. to the tip of the tongue 20.

In addition, the above-mentioned needle main body 11 has a concave shape 11b on the surface opposite to the surface facing the tongue portion 20 , that is, the back surface 11a. When the latch needle 10 in the locked state is viewed from the side along the axial direction A (see FIG. 1(b)), the concave shape 11b is provided at least to the position X where the needle main body 11 and the back surface 20a of the tongue portion 20 intersect. (P5 line). More specifically, the concave shape 11b is set to include at least the range from the mountain portion 20c of the tongue portion 20 to the intersection position X when the latch needle 10 in the locked state is viewed from the side along the axial direction A (from P4 to the P5 range).

In this embodiment, as shown in FIG. 1 and the like, the concave shape 11b is a shape in which the back surface 11a of the needle main body 11 is curved inwardly. By providing the concave shape 11b, the back surface 11a of the needle main body 11 is formed at a position corresponding to the rear end inclined portion 20e of the tongue portion 20 (in the range from P4 to P5) so that it becomes smaller as it goes toward the distal end side. A slightly steeper angle approaches the tongue 20 side, and at a position (range from P1 to P4) corresponding to the tip slant portion 20d of the tongue 20, the back surface 11a of the needle main body 11 is formed to be smaller than that of the above-mentioned tongue. The position (range from P4 to P5) corresponding to the rear end inclined portion 20e of 20 is a gentle inclined surface close to the tongue portion 20 side.

In addition, in the conventional structures shown in FIGS. 7 to 9 , when the loop of the knitting yarn S passes through the tongue 20 in the locked state, there may be a sharp gap between the latch needle 10 and the knitting yarn S. frictional resistance.

(a) of FIG. 7 is a stitch of the knitting yarn S at the length of the shortest yarn stretched around the needle body 11 and the tongue portion 20 on a plane perpendicular to the axial direction A of the needle body 11. When it is long (see (c) of FIG. 7 etc.), it is a graph showing the increase and decrease of the coil length. In addition, FIG. 9 is a table which shows the coil length in P1-P10. As shown in these figures, since the concave shape 11b does not exist in the conventional structure, the coil length increases sharply in the range from P5 to P3. As described above, since the stitch length increases rapidly, a sharp frictional resistance may be generated between the latch needle 10 and the knitting yarn S in some cases. In addition, after the coil length increases sharply in the range from P5 to P3, the coil length ushers in the first peak at P3, then decreases in the range from P3 to P2, and then again in the range from P2 to The coil length increases again in the range of P1. Since the coil length increases and decreases in this way, there is a problem that the frictional resistance becomes unstable.

For this point, adopt present embodiment, as shown in (a) of Fig. 1, Fig. 3, from P5 The coil length gradually increases in the range to P1. In other words, the stitch length of the present embodiment is configured to gradually increase without decreasing while the stitches of the knitting yarn S move toward the tip side along the back surface 20 a of the tongue 20 until they are detached from the tongue 20 . According to such a structure, the stitch length can be increased gradually, the sudden change of the frictional resistance can be suppressed, and the stitch of the knitting yarn S can be smoothly detached from the tip of the latch needle 10 . In addition, since the stitch length does not both increase and decrease until the stitch is detached from the tip of the latch needle 10, the frictional resistance can be stabilized.

In addition, since the back surface 11a of the needle main body 11 of the present embodiment is gradually inclined toward the tip end in a direction where the tip becomes thinner, the loop of the knitting yarn S can be smoothly separated from the tip end of the latch needle 10 without leaving the tongue portion 20. The rear hook is hooked on the back surface 11 a of the needle main body 11 .

In addition, in the above-mentioned embodiments, the concave shape 11b is formed in a shape in which the back surface 11a of the needle main body 11 is curved inwardly, but it is not limited thereto. That is, instead of the curved shape, or in addition to the curved shape, a chamfered shape formed on the back surface 11a of the needle main body 11 may be used as the concave shape 11b. Specifically, as shown in FIGS. 4 to 6 , the concave shape 11 b may be formed by chamfering the corner portion on the back surface 11 a side of the needle body 11 .

As described above, according to this embodiment, the needle main body 11 has a concave shape 11b on the surface opposite to the surface facing the tongue 20, that is, the back surface 11a, and the locked state is viewed from the side along the axial direction A. In the case of the lower latch needle 10, the concave shape 11b is provided at least to the position where the needle main body 11 and the back surface 20a of the tongue portion 20 intersect. According to such a structure, when the stitches of the knitting yarn S are looped over the tongue portion 20, the frictional resistance does not fluctuate rapidly. That is, in the conventional structure, when the stitches of the knitting yarn S are released toward the front end side along the back surface 20a of the tongue portion 20 in the locked state, the stitches of the knitting yarn S are caught on the back surface 20a of the tongue portion 20 and When the sliding starts, the loops of the knitting yarn S rapidly expand, and the frictional resistance fluctuates rapidly. In this regard, according to the present embodiment, since the concave shape 11b is provided, the stitches of the knitting yarn S will expand gently without sharp expansion even immediately after being placed on the tongue 20, so the latch needle The frictional resistance between 10 and the knitting yarn S is stable, and beautiful cloth can be knitted. In addition, since the knitting resistance is small, power consumption of the knitting machine can be suppressed, and damage to the latch needle 10 can be suppressed.

10:Latch needle

11: Needle body

11a: back

11b: concave shape

13: needle bar

14: Hook

14a: top

15: Cheek

16: Connecting part

20: Tongue

20a: back

20b: Groove

20c: Yamabe

20d: top slope

20e: rear end inclined part

25: rotating shaft

S: knitting yarn

X: cross position

A: Axial

Claims (5)

A latch needle comprising: a needle main body having a hook-shaped hook portion at a top end; and a tongue portion rotatably attached to the needle main body, and the tongue portion can be contacted and separated from the hook portion The latch needle is characterized in that: in the locked state where the tongue is in contact with the hook, the loop of the knitting yarn is separated from the back side of the tongue toward the tip side, and the needle body is in contact with the hook. The surface opposite to the surface of the tongue, that is, the back surface has a concave shape; when the latch needle in the locked state is viewed from the side along the axial direction, the concave shape is provided at least to the needle body and the needle body. The position where the back of the aforementioned tongue intersects. The latch needle according to claim 1, wherein the concave shape is characterized by a shape in which the back surface of the needle main body is bent inward. The latch needle according to claim 1 or 2, wherein the concave shape is characterized by a chamfered shape formed on the back surface of the needle body. The latch needle according to any one of Claims 1 to 3, wherein the back surface of the needle main body gradually inclines toward the tip end until it reaches the tip end. The latch needle according to any one of claims 1 to 4, wherein when the length of the shortest yarn stretched around the needle body and the tongue is taken as the loop length of the knitting yarn, the The loop length of the knitting yarn is characterized in that the loop length of the knitting yarn gradually increases and does not decrease while the loop of the knitting yarn moves toward the tip side along the back surface of the tongue until it is detached from the tongue.

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