CN100406628C - Biaxially reinforced weft-knitted spacer knitting structure and its knitting method - Google Patents

Abstract

The invention belongs to the field of textiles and provides a biaxially reinforced weft-knitted interval knitting structure, a weaving method and a yarn feeding device for a special flat knitting machine. The spacer knitting structure includes two weft and plain stitches, one set of connecting yarns, two sets of weft yarns, and two sets of warp yarns. The biaxially reinforced weft knitted structure is joined by a set of connecting yarns. This kind of spacer knitting mechanism greatly improves the mechanical properties of spacer knitted fabrics; reduces the requirements for the knitting performance of the connecting yarn, expands the application range of the connecting yarn, and is suitable for the reinforced structure of high-performance structure-functional composite materials.

Description

Biaxially reinforced weft-knitted spacer knitting structure and its knitting method

technical field

The invention belongs to the field of textiles, and relates to a knitting structure, in particular to a biaxially reinforced weft-knitting interval knitting structure, a knitting method and a yarn feeding device for a flat knitting machine.

Background technique

The spacer knit structure is a three-dimensional textile structure formed by connecting two separate surface layers of the knitted structure with yarns to form a spacer yarn layer between the two surfaces. The structure of spacer knitting can be changed flexibly, and the raw materials can be used in a wide range. It is easy to change the width, density, and interval width. With the application of resin impregnation, coating, lamination and other processes, air permeability, moisture absorption, moisture conductivity, and vibration resistance can be obtained. It is widely used as industrial knitting materials and structural functional composite materials to reinforce structures. At present, there are two representative spacer knitting structures: one is the warp-knitting spacer knitting structure woven on a double-needle bed warp knitting machine. Chains plus weft inserts and other organizational structures. The second is a weft-knitted spacer knitting structure woven on a flat weft-knitting machine, as shown in Figure 1. In this kind of fabric structure, besides the tuck weave, the connecting yarn can also be connected by other weaves such as rib weave. These two spacer knitting structures, except for the different feeding methods of the ground structure and the connecting yarn, have the common disadvantage that the surface layer structure is a loop structure, and there is no feeding of straight reinforcing yarns, and the curved structure of the knitting loops makes the yarn mechanically unstable. The performance cannot be fully utilized, resulting in poor mechanical properties of its surface layer structure.

Contents of the invention

The technical problem to be solved by the present invention is to avoid the disadvantages of the above-mentioned common spacer knitting structure, and provide a novel biaxially reinforced weft-knitting spacer knitting structure and its knitting method and flat knitting yarn feeding device.

The technical scheme that the present invention solves technical problem is as follows:

A biaxially reinforced weft knitting spacer knitting structure, including a first weft plain stitch 17, a second weft plain stitch 17', a set of connecting yarns 16, a first weft yarn 13, a second weft yarn 13', a A warp yarn 15, a second warp yarn 15'; the first weft yarn 13, the first warp yarn 15 and the first weft plain stitch 17 form a biaxially reinforced weft knitted structure, the second weft yarn 13', the second warp yarn 15' and the second weft plain stitch 17 ′ form another biaxially reinforced weft knitted structure, and the two biaxially reinforced weft knitted structures are connected by a set of connecting yarns 16 .

The first weft yarn 13 and the first warp yarn 15 are inserted into the first weft plain stitch 17 in a straight manner; the second weft yarn 13' and the second warp yarn 15' are inserted into the second weft yarn in a straight manner In the weft flat stitch ground structure 17'; the first weft yarn 13 and the first warp yarn 15 are respectively located on the opposite side of the first coil column 18 and the front side of the first sinker loop 19 of the first weft flat stitch ground structure 17; the second weft yarn 13 ' and the second warp yarn 15' are respectively located on the opposite side of the second coil stud 18' and the front side of the second sinker loop 19' of the second weft plain stitch 17'.

Yarn feeding device for flat knitting machines with biaxial reinforced weft spacer knitting structure, including front needle bed, rear needle bed, front needle bed needles, rear needle bed needles, two weft yarn guides, two knitting yarns Yarn guide, two groups of warp yarn guides, are characterized in that: also comprise a group of connection yarn guide 11; Described weft yarn guide, warp yarn guide and knitting yarn guide are used to connect yarn guide 11 is a centrally symmetrical configuration, and their arrangement sequence from the front needle bed to the rear needle bed is: the first weft yarn guide 3, the first warp yarn guide 9, the first knitting yarn guide 6, and the connecting yarn guide 11 , the second knitting yarn guide 6', the second warp yarn guide 9', and the second weft yarn guide 3'.

The first weft yarn guide 3, the second weft yarn guide 3', the first knitting yarn guide 6, and the second knitting yarn guide 6' can move along the direction of the needle bed; The warp yarn guide 9, the second warp yarn guide 9' and the connecting yarn guide 11 are respectively fixed on the first warp yarn supporting rod 10, the second warp yarn supporting rod 10' and a connecting yarn supporting rod 12; The first warp yarn guide 9 and the second warp yarn guide 9' are arranged horizontally along the direction of the needle bed, and each yarn guide is located between two knitting needles, and the distance between the yarn guides is the same as the needle pitch; A group of connecting yarn guides 11 are arranged horizontally along the direction of the needle bed, and each yarn guide is positioned between two knitting needles, and the distance between the yarn guides is the same as the needle pitch; the first warp support bar 10, the second warp yarn The support bar 10' is symmetrically installed on the frame of the flat knitting machine, and its position can be adjusted symmetrically up and down, front and back; the connecting yarn support bar 12 is installed on the frame of the flat knitting machine, and is located directly above the middle of the two needle beds , its position can be adjusted up and down.

The weaving method of the biaxially reinforced weft-knitted spacer knitting structure includes the following steps: (a) feeding the first warp yarn 15 and the second warp yarn 15' into the knitting area from the longitudinal direction, and each warp yarn is fed between two knitting needles, The first weft yarn 13 and the second weft yarn 13' are only fed when the knitting needles 2 of the front needle bed and the knitting needles 2' of the rear needle bed are knit; (b) the first knitting yarn guide 6 and the second knitting yarn guide The first knitting yarn 14, the second knitting yarn 14' and the first weft yarn 13 and the second weft yarn 13' are fed from the weft direction by the yarn device 6', the first weft yarn guide 3 and the second weft yarn guide 3' respectively. The knitting needles of the front needle bed 2 and the rear needle bed 2' are located at the front and back of the needle, and the knitting process is alternately carried out on the front needle bed 1 and the rear needle bed 1' of the two needle beds, forming two needle beds respectively. Independent biaxial reinforced weft knitting structure; (c) the connecting yarn guide 11 feeds the connecting yarn 16 from the longitudinal direction to the middle position of the front needle bed 1 and the rear needle bed 1' of the knitting area, and each connecting yarn Feed between two knitting needles, under the bending tension of the first knitting yarn 14 and the second knitting yarn 14', the connecting yarn is pulled to the position close to the front needle bed 1 and the rear needle bed 1' respectively, and Two independent biaxially reinforced weft-knitted structures are connected through the sinker arcs of the first coil post 18 and the second coil post 18' to form a spacer yarn layer.

Compared with the existing spacer knitting structure, the advantages of the present invention are:

1. Since the straightened warp and weft are lined in the surface layer structure of the spacer knitted fabric, the plane mechanical properties of the spacer knitted fabric are greatly improved.

2. Since the two surface layer structures of the new structure adopt the connection method of feeding yarns from the longitudinal direction, the connecting yarns are directly inserted into the sinker arcs of the knitting loops without loop knitting, thereby reducing the impact on the knitting performance of the connecting yarns. Requirements, the scope of application of spacer yarns has been expanded, and high-performance yarns with poor weaving performance can also be used as connecting yarns, which improves the mechanical properties of spacer knitted fabrics in the third dimension, that is, the thickness direction.

3. The weaving method is flexible and changeable. By selecting different threading methods of warp and weft yarns and connecting yarns, the knitting sequence of the front and rear needle beds, and changing the distance between the front and rear needle beds, we can weave biaxially reinforced weft knitting intervals with different connection densities and different fabric thicknesses Knit construction.

Description of drawings

Figure 1 Schematic diagram of the existing weft-knitted spacer knitting structure

Fig. 2 Schematic diagram of biaxially reinforced weft-knitted spacer knitting structure

Figure 3 Schematic diagram of A-A section in Figure 2

Figure 4 Schematic diagram of the yarn feeding device of the flat knitting machine

Figure 5 Schematic diagram of the initial knitting state of the yarn feeding device of the flat knitting machine

Figure 6 Schematic diagram of the knitting process on the needle bed before the yarn feeding device of the flat knitting machine

Figure 7 Schematic diagram of the knitting process on the needle bed behind the yarn feeding device of the flat knitting machine

Detailed ways

The specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings. It can be seen from Fig. 2 and Fig. 3 that the biaxially reinforced weft knitting spacer knitting structure of the present invention includes a first weft plain stitch 17 and a second weft plain stitch 17 ', a group of connecting yarns 16, the first weft yarn 13, the second weft yarn 13', the first warp yarn 15, the second warp yarn 15', the first weft yarn 13 and the first warp yarn 15 are inserted into the first weft flat in a straight manner In the needle ground structure 17; the second weft yarn 13' and the second warp yarn 15' are inserted into the second weft flat needle structure 17' in a straight manner; the first weft yarn 13 and the first warp yarn 15 are respectively located on the first weft level The opposite side of the first coil post 18 of the needle ground structure 17 and the front side of the first sinker loop 19 form a biaxially reinforced weft knitted structure; the second weft yarn 13' and the second warp yarn 15' are respectively located The opposite side of the second coil post 18' of the ground structure 17' and the front side of the second sinker loop 19' form another biaxially reinforced weft knitted structure. The two biaxially reinforced weft knitted structures are composed of a set of connecting yarns 16 connect.

The connecting yarn 16 alternately connects two independent biaxially reinforced weft knitted structures through the first sinker loops 19 of the first weft plain stitch 17 and the second sinker loops 19' of the second weft plain stitch 17'. The first weft yarn 13 and the first warp yarn 15 are lined into the first weft plain stitch 17 in a straight manner, and the mechanical properties of the yarns are fully utilized.

Referring to Fig. 4 and Fig. 5, the novel biaxially reinforced weft knitting spacer knitting structure flat knitting machine yarn feeding device of the present invention includes two flat knitting machine needle beds front needle bed 1 and rear needle bed whose teeth spacing can be adjusted horizontally 1', front needle bed 2, rear needle bed 2', first weft yarn guide 3, second weft yarn guide 3', first weft yarn guide slider 4, second weft yarn guide slider Block 4', first weft yarn guide rail 5, second weft yarn guide rail 5', first knitting yarn guide 6, second knitting yarn guide 6', first knitting yarn guide slider 7. The second knitting yarn guide slider 7', the first knitting yarn guide rail 8, the second knitting yarn guide rail 8', the first warp yarn guide 9, the second warp yarn guide 9' , a first warp yarn support rod 10, a second warp yarn support rod 10', a set of connecting yarn guides 11 and a connecting yarn supporting rod 12. The first warp yarn guide 9, the second warp yarn guide 9' and a group of connecting yarn guides 11 are respectively fixed on the first warp yarn supporting rod 10, the second warp yarn supporting rod 10' and the connecting yarn supporting rod 12, The first warp yarn support bar 10, the second warp yarn support bar 10' and the connecting yarn support bar 12 are all installed on the flat knitting machine frame, and the connecting yarn support bar 12 is positioned at the front needle bed 1 and the rear needle bed 1' teeth of the two needle beds. Directly above the middle of the opening, the first warp support rod 10 and the second warp support rod 10' are symmetrically distributed on both sides. The up and down and front and back positions of the first warp thread support bar 10, the second warp thread support bar 10' and the up and down position of the connecting yarn support bar 12 can be regulated. All yarn guides First weft yarn guide 3, second weft yarn guide 3', first knitting yarn guide 6, second knitting yarn guide 6', first warp yarn guide 9, The two warp yarn guides 9' and the connecting yarn guides 11 are all processed with thin metal tubes, and are symmetrically arranged with the connecting yarn guides 11 as the center. They are arranged in the following order from the front needle bed to the rear needle bed: the first weft yarn guide 3, the first warp yarn guide 9, the first knitting yarn guide 6, the connecting yarn guide 11, the second knitting yarn guide Yarn device 6', second warp yarn guide 9', second weft yarn guide 3'.

Its working principle is as shown in Figure 5, the first warp yarn guide 9, the second warp yarn guide 9 ' feeds the first warp yarn 15 and the second warp yarn 15 ' into the weaving area respectively from the longitudinal direction, and each warp yarn is positioned at two between knitting needles. The connecting yarn guide 11 feeds a group of connecting yarns 16 from the longitudinal direction to the position in the middle of the needle bed crease, and each connecting yarn is positioned between two knitting needles. The first weft yarn guide 3 and the second weft yarn guide 3' pass the first weft yarn guide slider 4 and the second weft yarn guide slider 4' along the corresponding first weft yarn guide rail 5 and the second weft yarn guide rail 5 respectively. The weft yarn guide rail 5' moves back and forth to feed the first weft yarn 13 and the second weft yarn 13' to the needle back positions of the front needle bed knitting needles 2 and the rear needle bed knitting needles 2'. The first knitting yarn guide 6 and the second knitting yarn guide 6' respectively pass through the first knitting yarn guide slider 7 and the second knitting yarn guide slider 7' along the corresponding first knitting yarn guide The guide rail 8 and the guide rail 8' of the second knitting yarn guide reciprocate to feed the first knitting yarn 14 and the second knitting yarn 14' to the pads in front of the knitting needles 2 of the front needle bed and the knitting needles of the rear needle bed 2' respectively Yarn position, where the first knitting yarn 14 is fed between the hooks of the needles 2 of the front needle bed and the connecting yarn 16, and the second knitting yarn 14' is fed between the hooks and the connecting yarn of the needles 2' of the rear needle bed Between 16. The knitting needles 2 of the front needle bed work simultaneously with the first weft yarn guide 3 and the first knitting yarn guide 6, and the knitting needles 2' of the rear needle bed work with the second weft yarn guide 3' and the second knitting yarn guide 6' work at the same time, and the two are performed alternately, forming two independent single-sided biaxial weft knitting structures together with the first warp yarn 15 and the second warp yarn 15' respectively. During knitting, the connecting yarn guide 11 is pulled to a position close to the front needle bed 1 and the rear needle bed 1' respectively under the bending tension of the first knitting yarn 14 and the second knitting yarn 14', and passes through the first The sinker arcs of the first coil post 18 and the second coil post 18' connect two independent biaxially reinforced weft knitting structures to form spaced yarn layers, and the size of the space can be determined by the front needle bed 1 and the rear needle bed. The horizontal distance of the tooth mouth of the bed 1' is adjusted, so that a new biaxially reinforced weft-knitted spacer knitting structure is woven on the flat knitting machine.

The working principle of the special knitting method for the biaxially reinforced weft knitting spacer knitting structure of the present invention is as follows:

As shown in Figure 5, the front needle bed knitting needle 2 and the rear needle bed knitting needle 2' have just completed the knitting of the last repeating unit at the initial position, and are in the lowest position. At this time, the front and rear cam systems are simultaneously on the left or right side of the needle bed, and are located outside the knitting area formed by the working knitting needles. Wear the first knitting yarn carrier 6 of the first knitting yarn 14, the second knitting yarn 14', the second knitting yarn carrier 6' and the first weft yarn of the first weft yarn 13 and the second weft yarn 13' The thread guide 3, the second weft thread guide 3' and the cam system are located on the same side of the needle bed. The first warp yarn 15, the second warp yarn 15' and the connecting yarn 16 are fed into the weaving area from the longitudinal direction by the first warp yarn guide 9, the second warp yarn guide 9' and a group of connecting yarn guides 11, each The warp and linking yarns are fed between the two needles and their positions remain constant.

Knitting process: Assume that the front and rear cam systems are on the left side of the needle bed at the same time. The knitting needles 2 of the front needle bed knit first, as shown in Figure 6, the cam system of the front needle bed and the first weft yarn guide 3 and the first knitting yarn guide 6 of the front needle bed move synchronously from left to right, and the front needle bed The first weft yarn guide 3 of the bed is raised before the knitting needles 2 of the front needle bed to pad the first weft yarn 13 to the position of the back of the needle. For convenience, the first weft yarn guide 3 pads the first weft yarn 13 to the needle In the position of the back, the knitting needles on the front needle bed 2 press the needles before starting the needles, and then lift up to withdraw the loops. The knitting needles 2 of the front needle bed are lowered after the knitting is completed. At this time, the first knitting yarn guide 6 of the front needle bed puts the first knitting yarn 14 in front of the hooks of the knitting needles 2 of the front needle bed, connecting the right side of the yarn 16 , and then the knitting needles 2 of the front needle bed continue to descend to bend the yarn into a loop. When bending the yarn, under the action of the first knitting yarn 14, the connecting yarn 16 is pulled to the front needle bed and fixed on the first needle bed by sinking arcs. In the weft plain stitch 17, when the knitting needles 2 of the front needle bed drop to the lowest point, the course knitting of a biaxially reinforced weft knitting spacer knitting structure on the front needle bed is completed. Next, the rear needle bed knitting needle 2' knits, and its knitting process is the same as the front needle bed knitting. As shown in Figure 7, the cam system of the rear needle bed and the second weft yarn guide 3' and the second knitting yarn guide 6' of the rear needle bed move synchronously from left to right, and the second weft yarn guide 3 of the rear needle bed 'Put the second weft yarn 13' to the position of the back of the needle before raising the knitting needle 2' on the rear needle bed, and pad the second weft yarn 13' to the position of the back of the needle for the convenience of the second weft yarn guide 3' , the knitting needle on the rear needle bed 2' presses the needle before raising the needle, and then raises and withdraws the loop. The knitting needles 2' of the rear needle bed are lowered after completing the loop withdrawal. At this time, the second knitting yarn guide 6' of the rear needle bed puts the second knitting yarn 14' in front of the hooks of the knitting needles 2' of the rear needle bed, and the yarn is connected. 16, then the knitting needles 2' of the rear needle bed continue to descend to form a loop by bending the yarn. When bending the yarn, under the action of the second knitting yarn 14', the connecting yarn 16 is pulled to the rear needle bed and passes through the sinking arc Fixed in the second weft flat stitch 17' of the rear needle bed, when the knitting needles 2' of the rear needle bed drop to the lowest point, the course knitting of a biaxially reinforced weft-knitted spacer knitting structure of the rear needle bed is completed. Like this, one repeating unit needs to carry out knitting respectively once before and after needle bed. When a repeating unit was completed, all the mechanisms got back to the initial positions as shown in Figure 6, and the weaving of a new repeating unit could start again.

From the above weaving process, it can be seen that all the weft and warp yarns are laid into the front and rear two surface layer knitting structures in a straight manner, which greatly improves the mechanical properties of the spaced knitted fabric plane; and the connecting yarns do not go through loop knitting The sinker arc directly inserted into the knitting loop from the longitudinal direction reduces the requirements for the knitting performance of the connecting yarn and expands the application range of the spacer yarn. By selecting different threading methods of warp and weft yarns and connecting yarns, the knitting sequence of the front and rear needle beds, and changing the distance between the front and rear needle beds, we can weave biaxially reinforced weft knitting intervals with different connection densities and different fabric thicknesses Knit construction.

Claims (6)

1. a twin shaft is to strengthening weft knitting knitted structure at interval, comprise the flat pin of first latitude ground tissue (17), second latitude flat pin ground tissue (17 '), one group connects yarn (16), it is characterized in that: also comprise first weft yarn (13), second weft yarn (13 '), first warp thread (15), second warp thread (15 '); First weft yarn (13), first warp thread (15) and the flat pin of first latitude ground tissue (17) form a twin shaft to strengthening the weft-knitting structure, second weft yarn (13 '), second warp thread (15 ') and second latitude flat pin ground tissue (17 ') form another twin shaft to strengthening the weft-knitting structure, and two twin shafts connect yarn (16) connection to strengthening the weft-knitting structure by one group.

2. twin shaft according to claim 1 is to strengthening weft knitting knitted structure at interval, and it is characterized in that: described first weft yarn (13) and first warp thread (15) serve as a contrast in the flat pin of first latitude ground tissue (17) in straight mode; Described second weft yarn (13 ') and second warp thread (15 ') serve as a contrast in the second latitude flat pin ground tissue (17 ') in straight mode; First weft yarn (13) and first warp thread (15) lay respectively at the reverse side of the first coil loop pillar (18) of the flat pin of first latitude ground tissue (17) and the front of first sinker loop (19); Second weft yarn (13 ') and second warp thread (15 ') lay respectively at the reverse side of the second coil loop pillar (18 ') of second latitude flat pin ground tissue (17 ') and the front of second sinker loop (19 ').

3. twin shaft according to claim 1 is characterized in that to strengthening weft knitting knitted structure at interval: described connection yarn (16) by the flat pin of first latitude ground tissue (17) first sinker loop (19) and second sinker loop (19 ') of second latitude flat pin ground tissue (17 ') alternately be connected two independently twin shaft to enhancing weft-knitting structure.

As claim 1,2 or 3 described twin shafts to strengthening the weft knitting braid method of knitted structure at interval, comprise the steps: (a) with first warp thread (15), second warp thread (15 ') from vertical feeding woven extent, every warp thread is fed between two pieces of knitting needles, and first weft yarn (13), second weft yarn (13 ') be feeding when front needle bed knitting needle (2), back needle-bed knitting needle (2 ') lopping braiding only; (b) the first stocking yarn thread-carrier (6), the second stocking yarn thread-carrier (6 ') and first weft feeders (3), second weft feeders (3 ') feed first stocking yarn (14), second stocking yarn (14 ') and first weft yarn (13), second weft yarn (13 ') the preceding and needle back position of pin of front needle bed knitting needle (2), back needle-bed knitting needle (2 ') respectively from broadwise, described braiding process is alternately carried out on needle-bar (1), the back needle-bar (1 ') before two needle-bars, form respectively two independently twin shaft to strengthening the weft-knitting structure; (c) connect yarn thread-carrier (11) and will connect yarn (16) needle-bar (1), back centre position of needle-bar (1 ') tooth mouth before vertical feeding woven extent, every connects yarn and feeds between two pieces of knitting needles, under the effect of first stocking yarn (14), second stocking yarn (14 ') the kinking tension force, connect the position that yarn is pulled to close preceding needle-bar (1), back needle-bar (1 ') respectively, and the sinker loop by the first coil loop pillar (18), the second coil loop pillar (18 ') two independently twin shaft couple together to strengthening the weft-knitting structure, form layer at interval.

5. twin shaft as claimed in claim 4 is to strengthening the weft knitting braid method of knitted structure at interval, it is characterized in that in step (b), first stocking yarn (14) is fed to the pinhock of front needle bed knitting needle (2) and connects between the yarn (16), second stocking yarn (14 ') is fed to the pinhock of back needle-bed knitting needle (2 ') and connects between the yarn (16), feed pin preceding stocking yarn braiding lopping, feed the weft yarn unlooped of needle back, be clamped between the loop pillar of warp thread and coil;

6. twin shaft as claimed in claim 4 is characterized in that to strengthening the weft knitting braid method of knitted structure at interval the size at layer interval, described interval can be regulated by preceding needle-bar (1) and the flat distance of the horizontal saliva of back needle-bar (1 ') tooth mouth; Described braiding process is alternately carried out on preceding needle-bar (1) and back needle-bar (1 '), form respectively two independently twin shaft to enhancing weft-knitting structure.

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