CN110820155A

CN110820155A - Needle bed of circular knitting machine and circular knitting machine with same

Info

Publication number: CN110820155A
Application number: CN201910730086.6A
Authority: CN
Inventors: 西垣诚人; 江西克
Original assignee: Precision Fukuhara Works Ltd
Current assignee: Precision Fukuhara Works Ltd
Priority date: 2018-08-10
Filing date: 2019-08-08
Publication date: 2020-02-21
Also published as: EP3608462A1; EP3608462B1; TW202012717A; JP2020026591A

Abstract

A bed of a circular knitting machine is provided in which the contact area between the insert and the knitting tool is reduced without greatly modifying the structure of the knitting tool or of the insert forming a slot for slidably mounting the knitting tool. In a needle bed which can be provided in a circular knitting machine, a knitting tool is slidably attached to grooves in which opposing plate surfaces of adjacent rectangular plate-shaped inserts (50) are both side surfaces, and the inserts (50) are provided with a plurality of recesses (53) in the short side direction (X) and the long side direction (Y) of the plate surfaces.

Description

Needle bed of circular knitting machine and circular knitting machine with same

Technical Field

The present invention relates to a needle bed to which a knitting tool is attached, and a circular knitting machine that rotates the needle bed to knit a tubular knitted fabric.

Background

In the past, circular knitting machines have been known which rotate a cylinder provided with a plurality of needles slidably in a needle groove to knit a tubular knitted fabric, and many of them employ a single-face knitting circular knitting machine in which cylinder needles and sinkers are provided in a rotating cylinder and a double-face knitting circular knitting machine in which needles are provided in both a rotating cylinder and a dial.

In a single-sided circular knitting machine, a cylindrical needle cylinder is provided, and a sinker disc is provided on the upper part of the needle cylinder, and both are rotated in synchronization. The cylinder needle is inserted into a needle groove provided vertically outside the cylinder, and the cylinder needle vertically moves up and down along a cam trace (cam trace) by rotating with the cylinder of the circular knitting machine. On the other hand, sinkers formed by auxiliary coils are inserted into sinker grooves radially provided on the sinker disc, and the sinkers horizontally move back and forth along a triangular locus by the rotation of the sinker disc accompanying the circular knitting machine. The cylinder needles and the sinkers are orthogonal to each other and face each other, and the stitches of the knitted fabric are formed by the mutual movement of the cylinder needles and the sinkers.

In a double-sided circular knitting machine, a disk-shaped dial and a cylindrical needle cylinder are provided, and the dial is provided above the needle cylinder and rotates synchronously with the needle cylinder. The cylinder needle is inserted into a needle groove vertically provided on the outer periphery of the cylinder, and the cylinder needle moves up and down along a triangular path by rotating with the cylinder of the circular knitting machine. On the other hand, the dial needles are inserted into needle grooves radially provided on the dial, and the dial needles horizontally move back and forth along a triangular track by rotation of the dial of the circular knitting machine. The cylinder needles and the dial needles are orthogonal to each other and face each other, and by the mutual movement of the cylinder needles and the dial needles, loops of the knitted fabric are formed.

In general, a needle bed refers to a device that receives a knitting tool guided by a cam, a selector, and the like and moves when a circular knitting machine such as a jacquard (jack) in which a selector selects a needle is operated, in addition to cylinder needles, sinkers, and dial needles. A single-knit circular knitting machine includes a bed referred to as a cylinder including cylinder needles, sinkers, and jacquard, etc., and a sinker disc, and a double-knit circular knitting machine includes a bed referred to as a cylinder including cylinder needles, jacquard, etc., and a dial mounted with dial needles, jacquard, etc.

The needle bed includes a 1 st type and a 2 nd type, the 1 st type being manufactured by providing a groove composed of both side faces and a bottom face, the groove being used for movably mounting a knitting tool such as a sinker, the 2 nd type being manufactured by: an insert groove is provided, an insert is inserted into the groove, and an adhesive is applied to the joint portion or the insert is fitted. In a needle bed having an insert, a knitting tool such as a needle or a pattern piece is slidably attached to a groove formed so that adjacent inserts are both side surfaces and a base material is a bottom surface.

In operation of a circular knitting machine, for example, since a cylinder needle slides between inserts in a cylinder, friction force is generated between the two, and deterioration due to friction and a short duration of both are sometimes required, and it is necessary to reduce the friction force. Further, for example, in the sinker disc, since the sinker as a knitting tool slides between the side surfaces of the groove provided in the needle bed, it is also necessary to reduce the frictional force between the both.

In the past, for the purpose of reducing the frictional force by reducing the contact area between the insert and the knitting tool, for example, JP 48-089948 a, which discloses a wave-shaped cross-sectional shape of the insert; CN101805955A discloses a method of manufacturing an insert, in which the insert is formed in a row in the longitudinal direction and is formed into a large concave shape by embossing or forming a large through hole. Further, US 1869416 is known in which the above-described wave-shaped through-hole of the insert is press-worked by a die (die).

However, with the plate surface shape of the insert in the past, the structure itself of the insert is greatly improved, and time and cost are spent in the machining. In addition, in a circular knitting machine requiring fine precision, it is difficult to provide all the contact points of an insert and a knitting tool on a flat surface in the processing of making a large hole or a recess curved in a wave shape for the insert and the knitting tool, and the dimensional precision of the processing is reduced, which adversely affects knitting, and stress applied during the vertical movement of the knitting tool is shifted, and the degradation of a part of the knitting tool occurs early.

Although the lubricating oil acting between the knitting tool and the insert has some effect of remaining in the above-described wave pattern or the like, the wave pattern or the like is provided in a large size in order to reduce the contact area, and the area exposed without overlapping the wave pattern or the like is large relative to the knitting tool, and the lubricating oil flows out from the wave pattern or the like to the outside, and the sufficient reducing effect cannot be exerted. Therefore, the conventional machining for reducing the frictional force must not match the time and cost required for machining or the like.

In addition, in recent years, high-speed operation of a circular knitting machine has been required, and accordingly, power consumption for operation of the circular knitting machine has increased, and the friction of a knitting tool has increased.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a needle bed of a circular knitting machine, which can reduce a contact area between a knitting tool and an insert to be slid and reduce a frictional force without greatly changing a structure of the knitting tool or the insert (the insert is formed with a groove to which the knitting tool is slidably attached).

In order to achieve the above object, a needle bed of a circular knitting machine according to the present invention is a needle bed which is provided in a circular knitting machine, and in which a knitting tool is slidably attached to grooves having two side surfaces on opposing plate surfaces of adjacent rectangular plate-shaped inserts, and the inserts are provided with a plurality of recesses in a short side direction and a long side direction of the plate surfaces.

According to this aspect, since the plurality of recesses are provided in the short side direction and the long side direction of the insert, the structure itself of the insert, which is formed in a wave shape or the like, is not changed as in the conventional art, and thus the time and cost for machining are reduced, and the accuracy of the machined dimension is not affected. Further, by providing a plurality of small recesses, the contact area between the insert and the knitting tool can be reduced, the frictional force can be effectively reduced, and the discharge of the lubricating oil to the outside can be suppressed.

In the present invention, it is preferable that the insert is divided into a planar region having no recess and a recess region having a recess in the short-side direction, and a dimension of the recess in the short-side direction is 1/4 or less of a dimension of the insert in the short-side direction. When the width of the insert piece is about 1/2, the bonded area for the base material is formed with the side surface of the needle groove on the remaining 1/2 side and the width of the knitting tool is more than 1/2 of the width of the insert piece, so that if the width of the insert piece is 1/4 or less, the number of the concave portions and the knitting tool can be overlapped or overlapped in the width direction.

In the present invention, it is preferable that the size of the concave portion in the short side direction is smaller than the size of the knitting tool in the direction. In this case, the number of the concave portions and the knitting tools can be increased, and the contact area between the insert and the knitting tools can be reduced by providing a plurality of small concave portions, whereby the frictional force can be reduced more effectively, and the discharge of the lubricating oil to the outside can be further suppressed.

Preferably, the recessed portions are formed so as not to overlap each other in the thickness direction of the insert between the recessed portions provided on the respective plate surfaces of the inner and outer plate surfaces. Since the recesses are offset from each other on the inner and outer surfaces, the thickness of the insert can be kept constant so that no recess is present on the inner surface of the recess on the outer surface, and the strength is not reduced by the formation of the recess.

Preferably, the size of the concave portion in the short side direction is in a range of 2.00mm or less. In particular, it is preferable that the size of the concave portion in the short side direction is in a range of 1.00mm or less. Accordingly, the contact area between the insert and the knitting tool can be reduced, the frictional force can be more effectively reduced, and the discharge of the lubricating oil to the outside can be further suppressed.

Further, it is preferable that the concave portions are formed by a dimple processing in which concave portions having the same shape are provided at regular intervals in each of the short-side direction and the long-side direction. Thus, by the dimple processing, the recessed portions can be easily formed without affecting the processing dimensional accuracy, and further, the surface hardness of the plate material can be increased, and the recessed portions can be provided at regular intervals, whereby the effect of holding the lubricating oil can be produced as a whole without displacement.

Preferably, the recessed portions are provided so as to be arranged uniformly over the entire recessed portion region. Thus, there is no deviation in the effect of the position in the recessed region, and an equivalent friction reducing effect can be obtained regardless of the position in the recessed region.

In the present invention, it is preferable to form a circular knitting machine having the above-described needle bed. In this case, a circular knitting machine with a bed is obtained in which the contact area between the sliding knitting tool and the insert is reduced, reducing the friction, without greatly changing the structure of the insert, the knitting tool itself.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can reduce the contact area between the sliding knitting tool and the insert and reduce the friction force without greatly changing the structure of the knitting tool or the insert forming the groove for slidably mounting the knitting tool.

Any combination of at least two structures disclosed in the claims and/or the description and/or the drawings is encompassed by the present invention. In particular, any combination of two or more of the individual claims in the claims is also encompassed by the present invention.

Drawings

The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and the drawings are for illustrative and descriptive purposes only and should not be construed to limit the scope of the present invention. The scope of the invention is determined by the claims. In the drawings, like reference numerals designate like parts throughout the several views.

FIG. 1 is a front elevational view of the entirety of a single jersey circular knitting machine according to embodiment 1 of the present invention;

FIG. 2 is a partial longitudinal cross-sectional view of a knitted portion of the single jersey knitting circular knitting machine;

FIG. 3 is a transverse cross-sectional view of the syringe barrel;

FIG. 4 is a partial cross-sectional view of the needle bed and a partial enlarged view thereof;

FIG. 5 is an enlarged cross-sectional view of the V portion of FIG. 3 showing a state where the needle slides between the inserts;

fig. 6 is a side view of a sinker according to embodiment 2 of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a front view of a circular knitting machine 10 having a bed according to embodiment 1. The circular knitting machine 10 is, for example, a single jersey knitting circular knitting machine, which includes: a knitting portion 12 for knitting a tubular knitted fabric; a winding section 13 for winding the tubular knitted fabric; a control section 16 for controlling the whole of the circular knitting machine.

In fig. 1, the knitted part 12 is provided above a bed 22 supported by a plurality of legs 21. A plurality of columns 24 are erected on the bed 22, and a horizontal member 25 is fixed to the upper part thereof via a connecting member. The yarn feeding portion 9 is supported by the horizontal member 25. The knitting section 12 rotates a needle cylinder 33 (fig. 2) by driving of a main motor 15 under the control of a control section 16, and in the needle cylinder 33, a plurality of cylinder needles 31 (fig. 2) are slidably provided in needle grooves 32 (fig. 2) of the needle cylinder, and feeds a yarn 11 to the cylinder needles 31 via a yarn feeding section 9 to spirally overlap stitches, thereby knitting a tubular knitted fabric. The knitted fabric is wound by a winding unit 13, and the winding unit 13 includes a plurality of winding rollers provided below the bed 22.

Figure 2 shows a partial longitudinal cross-sectional view of the knitted portion 12 of the single jersey knitting circular knitting machine. A single-jersey circular knitting machine comprises a cylindrical needle cylinder 33, on the upper part of which a sinker disc 36 is arranged, which rotate synchronously. The cylinder needle 31 is inserted into a cylinder needle groove 32, and the cylinder needle groove 32 is vertically opened in the outer periphery of the cylinder 33. The cylinder cam 34 is provided on a cylinder cam seat 42, and the gear ring 37 rotates in accordance with the driving of the main motor 15 (fig. 1), and the needle cylinder 33 fixed to the upper portion of the gear ring 37 rotates, whereby the needle foot 45 of the cylinder needle 31 moves up and down along the cylinder cam locus 38.

On the other hand, the sinker 35 formed by the auxiliary coil is inserted into a sinker groove radially opened on the upper surface of the sinker disc 36, and the sinker cam 43 is provided on the sinker cam base 41, and the sinker leg 44 of the sinker 35 moves back and forth along the sinker cam locus 40 by the rotation of the sinker disc 36 accompanying the circular knitting machine. The sinkers 35 are inserted into the slots of the sinker disc 36 and the sinker foot 39. The cylinder needle 31 and the sinker 35 are opposed to each other so as to be orthogonal to each other, and by the mutual movement of the both, a stitch is formed to produce a tubular knitted fabric.

The needle bed 30 includes a knitting tool which is operated by being guided by cams, selectors, and the like during operation of a circular knitting machine to which cylinder needles 31, sinkers 35, and jacquard (not shown in the drawings) for selecting needles are attached, and this is not shown in the present example.

Fig. 3 is a transverse sectional view of the cylinder 33. In the needle bed 30, the insert groove 51 is cut into the base material of the needle cylinder 33, and then the rectangular plate-shaped insert 50 is inserted into the insert groove 51 and bonded with the adhesive. Next, the cylinder needle 31 is inserted into a cylinder needle groove having the opposing plate surfaces of the adjacent insert 50 as the both side surfaces, and slidably attached (fig. 2).

Fig. 4 is a partial sectional view of the needle bed 30 and a partial enlarged view thereof. A plurality of recesses 53 are formed in the lateral direction X and the longitudinal direction Y on the corresponding inner and outer surfaces of the insert 50 constituting the contact surface of the cylinder needle 31. The insert 50 is divided in the short side direction X into a planar region 50A without the recess 53 and a recess region 50B.

As shown in fig. 4, the cylinder needle 31 generally has a meandering (meander) shape for the reason of preventing breakage of the needle or the like. The concave portion 53 opened in the insert 50 has a circular concave shape and is provided with a diameter smaller than the dimension X in the short side direction of the cylinder needle 31 as a knitting tool. Since the lateral dimension of the cylinder needle 31 is often equal to or larger than 1/4 of the lateral dimension of the insert 50, if the diameter of the concave portion 53 is equal to or smaller than 1/4 of the lateral dimension of the insert 50, the cylinder needle 31 and the concave portion 53 may overlap in the lateral direction X or overlap in many portions. Further, since the plurality of recesses 53 are provided with a small diameter in the insert 50 and do not communicate with the outside, the lubricant is not easily discharged to the outside and remains, the holding effect is high, and the frictional force between the cylinder needle 31 and the insert 50 can be reduced.

Further, the cylinder needles 31 often have a dimension in the lateral direction X of about 1/2 which is the height of the side wall extending in the lateral direction X of the cylinder needle groove 32. Accordingly, if the diameter of the concave portion 53 is equal to or less than 1/2 of the dimension X in the short side direction of the cylinder needle groove 32, the cylinder needle 31 and the concave portion 53 almost overlap or overlap in the short side direction X in many cases. In the case of the above-mentioned chinese patent publication CN101805955, since half of the recesses do not overlap the cylinder needle even if 1 row of 1 recess having a large width in the short side direction is provided in the long side direction of the insert, and the effect of reducing the frictional force is small, in the present invention, a plurality of small recesses are provided in the short side direction X and the long side direction Y to reduce the frictional force.

In addition, if the insert 50 itself is considered, about 1/2 in the dimension in the short direction X serves as an adhesion region of the base material, and the remaining 1/2 constitutes a side wall of the cylinder needle groove 32. Since 1/2 of the side wall constitutes a recess region, the effect of the present invention can be sufficiently obtained if the diameter of the recess 53 is about 1/4 of the dimension in the short side direction X of the insert 50.

The dimension of the insert 50 of this example in the longitudinal direction Y × the short-side direction X is about 150mm × 8 mm. Further, as shown in fig. 4, the cylinder needle 31 has a structure in which the shapes of the needle portion at the tip, the stitch 45, and the like are different, and the dimension in the short side direction X is in the range of about 1.0 to 6.5 mm. As described above, if the diameter of the recess 53 is about 1/4 times the dimension of the insert 50 in the short side direction X, the effect of reducing the frictional force is obtained, and therefore, the diameter D of the recess 53 is preferably in the range of 2.0mm or less. In addition, if considering the minimum value of the dimension of the cylinder needle 31 in the short side direction X, the diameter D of the concave portion 53 is preferably in the range of 1.0mm or less in particular. In addition, the depth H is preferably 5 to 20 μm (0.005 to 0.02mm) in consideration of the effect of retaining the lubricating oil. Even in the case of such a small diameter, since the recesses 53 are formed alternately, the contact area between the insert 50 and the cylinder needle 31 is 1/2 as a whole, and the frictional force can be reduced, as compared with the case where there is no recess. By providing the plurality of small concave portions 53, the frictional force can be reduced, and the holding effect of the lubricating oil becomes large.

In this example, as shown in the partially enlarged view of fig. 4, a plurality of circular recesses 53 are provided on the plate surface of the insert 50 so as to be staggered at equal intervals in the same shape, that is, so as to be staggered from each other in the short-side direction X and the long-side direction Y. The solid circles indicate the outer recesses 53, and the dashed circles indicate the inner recesses 53. Since the recesses 53 provided on the inner and outer surfaces of the plate material of the insert 50 are formed so as not to overlap each other in the thickness direction, the thickness of the insert 50 after the recess processing is maintained substantially constant as a whole, and is constant in terms of strength.

Fig. 5 is an enlarged cross-sectional view of the V portion of fig. 3 showing a state where the cylinder needle 31 slides between the inserts 50. As shown in fig. 5, the cylinder needle 31 slides in the longitudinal direction Y (see fig. 4) between the adjacent inserts 50. On the outer surface of the insert 50, a plurality of concave portions 53 are formed by a dimple process in which concave portions having the same shape are provided at regular intervals in each of the short-side direction X and the long-side direction Y.

The concave portion 53 is formed by performing a dimple processing on both surfaces of the plate material by a general standard pressing method. The dimple processing does not affect the processing dimensional accuracy, and the pressing effect of the two surfaces can increase the surface hardness of the insert 50.

The power consumption was measured and compared for the needle bed of the insert of the present invention and the ordinary needle bed using the ordinary insert without the recess. The common weaving conditions are: the circular knitting machine had a diameter of 30 inches and 28 stitches (gauge), the number of revolutions of the circular knitting machine was 40r.p.m., the yarn was 167dtex (dtex), the knitting structure was plain (jersey), the density of the stitches was 240mm/100W (number of stitches), and the circular knitting machine was operated at 2000 revolutions to knit the knitted fabric.

As a result, the power consumption of the ordinary needle bed was 2223.9 Wh. On the other hand, the power consumption of the needle bed of the insert of the invention was 1901.6 Wh. Accordingly, the effect of reducing the power consumption by 14.5% was confirmed by the reduction of the frictional force by the concave portion 53.

In this example, although a single-sided circular knitting machine is used, in the case of a double-sided circular knitting machine (not shown in the drawings), a concave portion is formed in an insert 50 of a needle cylinder groove in which a cylinder needle slides, dial needles, a pattern piece, and the like are provided in a needle bed, and a concave portion is formed in an insert of a dial groove in which a dial needle slides, as in the case of the single-sided circular knitting machine. Thus, in each bed, friction can be reduced by the recess, as in the case of the single-knit circular knitting machine described above.

Fig. 6 is a side view of a sinker according to embodiment 2 of the present invention. In this example, a plurality of circular recesses 53a are formed on the inner and outer surfaces of the plate-like sinker 35 that forms the auxiliary winding while moving horizontally with respect to the vertically moving needle. The other structure is the same as embodiment 1, but the recess may not be provided in the insert of the needle bed of embodiment 1.

The sinker 35 moves forward and backward in the radial direction of the cylinder 33, and at this time, as shown in fig. 2, the sinker 35 rubs against the groove in which the sinker 35 is mounted, in the vicinity of the middle portion in the front portion in the center direction of the cylinder 33, and in the vicinity of the entire lower portion in the rear portion in the opposite direction. Thus, the concave portion 53a of fig. 6 is provided on the front middle and rear entirety of the sinker 35. Although it is effective if the diameter of the concave portion 53a can be suppressed in the area region of the knitting tool, in this example, since the holding effect of the lubricating oil is uniformly generated as a whole, it is preferable to provide a plurality of small concave portions. Thus, a plurality of minute circular concave portions 53a are provided at equal intervals in the front-rear direction and the vertical direction by the dimple processing.

By providing the recess not only in the sinker 35 as in the present example but also in the knitting tool such as the needle or the jacquard, the same effect can be obtained even when the recess is not provided in the needle bed. In addition, in the case where the recess 53a is provided in the sinker 35, even in the case where the recess 53 is not provided in the insert 50, the effect is obtained. It is not necessary to perform the processing of the recess in the needle bed.

In this way, by using a knitting tool for a circular knitting machine in which a plurality of recesses are provided in the short side direction and the long side direction of the two side surfaces having the largest inner and outer areas as a plate-shaped knitting tool slidably fitted in a groove formed in a needle bed of the circular knitting machine, the contact area between the sliding knitting tool and the groove can be reduced and the frictional force can be reduced without greatly changing the structure of the groove in which the knitting tool is slidably fitted and the knitting tool can be largely changed.

In addition, if the knitting tool is divided into a plane area without a concave portion and a concave area with a concave portion in the short side direction, and the size of the concave portion in the short side direction is smaller than that of the knitting tool, the concave portion and the outside are not communicated, and the lubricating oil is retained, and the friction is reduced.

Further, if the concave portion is provided to include a contact portion with the groove in the knitting tool fitted in the groove, friction can be reduced by reducing the contact area of the contact portion via the concave portion.

The concave portions may be formed so as to be shifted from each other so as not to overlap each other in the thickness direction of the knitting tool. As a result, the thickness of the knitting tool after the recess processing is kept substantially constant as a whole, and the knitting tool is constant in terms of strength.

Further, it is preferable that a dimension of the concave portion in the short side direction is in a range of 1.0mm or less. Therefore, compared with the needle with the smallest dimension in the short side direction in the knitting tool, the dimension of the concave part in the same direction is smaller, the concave part is arranged on the outer surface of the knitting tool, the concave part is not communicated with the outer part, the lubricating oil can be kept, and the friction is reduced.

In addition, it is preferable that the concave region is provided so as to include a region around a side end in one of the short-side directions in one of the side surfaces and a region around a side end in an opposite direction to the side end in the other of the side surfaces. Thus, the knitting tool is inclined by the rotation of the circular knitting machine, and a recessed region can be provided in a portion where the knitting tool is in strong contact with the groove, thereby effectively reducing friction.

In single-jersey knitting circular knitting machines using sinkers 35, in the sinker disc 36 and sinker base 39 of fig. 2, a groove is directly formed in which knitting tools can be mounted, and the plate-shaped sinker 35 slides. Thus, although it is necessary to reduce the frictional force as in embodiment 1, the plurality of concave portions 53a described above are provided on the inner and outer surfaces of the sinker 35 as shown in fig. 6.

As described above, in the present invention, by providing a plurality of concave portions on the contact surface between the insert and the knitting tool, the contact area can be reduced, and the frictional force can be reduced, thereby reducing the power consumption. Further, the amount of lubricant used can be reduced by the retaining effect of the recessed portion. In addition, since the recesses are offset from each other on the inner and outer surfaces constituting the contact surface, a constant plate thickness can be secured, and the strength is not reduced by the recesses.

In each embodiment, the concave portion has a circular concave shape, but is not limited to this, and may be an elliptical shape, a polygonal shape, or the like instead of a circular shape. The recesses 53 are provided in a staggered pattern (in a pattern of thousand bird) at equal intervals in the same shape, but the shape and interval may be changed without being limited to this. In addition, the recess may be provided on one surface of the insert or knitting tool, or on both surfaces thereof. In the case of one surface, it is preferable that a concave portion is provided on the surface in the direction opposite to the rotational direction of the needle bed. The concave regions may not be disposed on all surfaces, but may be disposed in scattered locations on the surfaces. In addition, when the recessed portions are provided on both surfaces, the recessed portion regions may be provided so as not to partially or entirely overlap in the thickness direction of the insert.

As described above, the preferred embodiments have been described with reference to the accompanying drawings, but various changes and modifications will be apparent to those skilled in the art within the scope of the apparent reading of the present application. Accordingly, such changes and modifications are to be construed as being within the scope of the present invention as defined by the appended claims.

Description of reference numerals:

reference numeral 10 denotes a circular knitting machine;

reference numeral 12 denotes a knitting portion;

reference numeral 30 denotes a needle bed;

reference numeral 31 denotes a cylinder needle;

reference numeral 32 denotes a cylinder needle groove;

reference numeral 33 denotes a cylinder;

reference numeral 35 denotes a sinker;

reference numeral 50 denotes an insert;

reference numeral 50A denotes a plane area;

reference numeral 50B denotes a concave region;

reference numeral 53(53a) denotes a concave portion;

symbol X represents a short side direction;

symbol Y represents the longitudinal direction.

Claims

1. A needle bed that can be arranged in a circular knitting machine,

in the needle bed, knitting tools are slidably mounted in grooves having opposite plate surfaces of adjacent rectangular plate-shaped inserts as two side surfaces;

the insert is provided with a plurality of recesses in the short side direction and the long side direction of the plate surface.

2. The needle bed according to claim 1, wherein the insert is divided into a flat region having no recess and a recess region having a recess in the short side direction, and a dimension of the recess in the short side direction is 1/4 or less of a dimension of the insert in the short side direction.

3. A needle bed according to claim 1 or 2, wherein a dimension of the concave portion in the short side direction is smaller than a dimension of the knitting tool in the direction.

4. A needle bed according to any one of claims 1 to 3, wherein the recessed portions are formed so as not to overlap each other in a thickness direction of the insert between the recessed portions provided on the respective plate surfaces of the inner and outer plate surfaces.

5. A needle bed according to any one of claims 1 to 4, wherein a size of the concave portion in the short side direction is in a range of 2.00mm or less.

6. A needle bed according to any one of claims 1 to 4, wherein a size of the concave portion in the short side direction is in a range of 1.00mm or less.

7. The needle bed according to any one of claims 1 to 6, wherein the recessed portions are provided so as to form a uniform arrangement over the entire recessed portion region.

8. The needle bed according to any one of claims 1 to 7, wherein the recessed portions are formed by a dimple processing in which recessed portions of the same shape are provided at regular intervals in each of the short side direction and the long side direction.

9. A circular knitting machine comprising a needle bed as claimed in any one of claims 1 to 8.