CN110093711B - Needle moving system with two bidirectional needle selecting devices as one path for knitting machinery - Google Patents
Needle moving system with two bidirectional needle selecting devices as one path for knitting machinery Download PDFInfo
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- CN110093711B CN110093711B CN201910465168.2A CN201910465168A CN110093711B CN 110093711 B CN110093711 B CN 110093711B CN 201910465168 A CN201910465168 A CN 201910465168A CN 110093711 B CN110093711 B CN 110093711B
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- needle
- jacquard
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- needles
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 57
- 238000009940 knitting Methods 0.000 title claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 238000009963 fulling Methods 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Abstract
The invention discloses a needle moving system taking two bidirectional needle selectors as one path for knitting machinery, which comprises a needle cylinder main shaft arranged on a large flat plate, wherein a needle cylinder is arranged outside the needle cylinder main shaft Zhou Peige, jacquard needles are arranged on the needle cylinder, the jacquard needles are correspondingly provided with knitting needles and control the positions of the knitting needles, the jacquard needles are controlled by the needle selectors through matching with needle selecting steel rings, at least two needle selectors are also arranged on the periphery of the needle cylinder, and the two needle selectors are both bidirectional needle selectors; the two bidirectional needle selectors realize needle position control of needle hiding position, tucking position and looping position of the knitting needles under jacquard needle control. The invention changes the needle moving system which can only complete the positive and negative bidirectional control of needle hiding track, tucking track and looping track by at least three needle selectors into at least two bidirectional needle selectors which are matched with needle hiding track, tucking track and looping track on the needle selecting steel ring to realize the same function, thereby greatly reducing the manufacturing cost of equipment, leaving enough installation space to improve the equipment performance of knitting machinery, simultaneously slowing down the gradient of the needle selecting steel ring and improving the running rotating speed of the machine.
Description
Technical Field
The invention relates to a needle moving system, in particular to a needle moving system with two bidirectional needle selecting devices as one path for knitting machinery.
Background
The needle moving system of the existing knitting machine (mainly referred to as a sock knitting machine) consists of a large flat plate 11, a needle selecting steel ring 10, a forward needle selector 3, a reverse needle selector 5, a bidirectional needle selector 4, a needle selector base (left) 8, a needle selector base (middle) 7, a needle selector base (right) 6, a needle cylinder 1, a needle cylinder main shaft 9 and jacquard needles 2. The main shaft of the needle cylinder is positioned in the central hole of the large flat plate, the needle cylinder is concentrically sleeved on the outer circle of the main shaft of the needle cylinder through the inner hole, and the needle cylinder can also axially move up and down while rotating around the circle center; the jacquard needle is positioned in an axial groove on the outer wall of the needle cylinder, can synchronously rotate under the drive of the needle cylinder, can swing inside and outside under the combined action of the needle selector and the elastic sheet at the back of the jacquard needle, and can slide up and down under the action of the needle selecting steel ring; the forward needle selector is fixed on the end face of the large flat plate through a needle selector base (left) and is concentric with the outer circle of the needle cylinder; the reverse needle selector is fixed on the end face of the large flat plate through a needle selector base (right) and is concentric with the outer circle of the needle cylinder; the bidirectional needle selector is fixed on the end face of the large flat plate through a needle selector base (middle) and is concentric with the outer circle of the needle cylinder. The needle cylinder, the needle cylinder main shaft and the jacquard needle are used as moving components, and the needle selecting steel ring, the forward needle selector, the reverse needle selector, the bidirectional needle selector, the needle selector base (left), the needle selector base (middle) and the needle selector base (right) are used as fixing components. The structure of the device is schematically shown in fig. 1.
In the needle moving system of the existing knitting machine, when only a bidirectional needle selector is used for selecting needles, the knitting needles corresponding to the selected jacquard needles are positioned at needle hiding positions; when the machine rotates clockwise and the clockwise needle selector and the bidirectional needle selector re-check the needles, the knitting needles corresponding to the repeated jacquard needle selection are positioned at the tuck needle position; when the machine reverses and the reverse needle selector and the bidirectional needle selector re-check the needles, the knitting needles corresponding to the repeated jacquard needle selection are positioned at the tuck needle position; when none of the needle selectors selects a needle, the knitting needle corresponding to the jacquard needle which is not selected is positioned at the looping needle position. The needle position control schematic diagrams of the four-way needle moving system of the prior knitting machine are shown in fig. 2 and 3, wherein the machine running direction is the rotating direction of the needle cylinder main shaft 9.
The four-way needle moving system of the existing knitting machine has the following obvious defects: each path is required to be provided with two unidirectional needle selectors with different directions and one bidirectional needle selector, and through the cooperation of the unidirectional needle selectors and a needle selecting steel ring, arbitrary control of 3 needle positions of looping, tucking and needle hiding of any jacquard needle at the needle position corresponding to a yarn feeding port is realized, that is to say, each path needs 3 needle selectors, if four paths need to be provided with 12 needle selectors in total, the configuration cost is greatly improved, meanwhile, the installation space is greatly occupied, the gradient of the needle selecting steel ring is forced to be increased, and the running rotating speed of the machine is finally influenced. How to solve the technical problems is the subject of the study of the person skilled in the art.
Disclosure of Invention
The invention provides a needle moving system which is low in manufacturing cost and can improve the rotating speed of a needle cylinder main shaft and is used for two bidirectional needle selectors.
The needle moving system comprises a needle cylinder main shaft arranged on a large flat plate, a needle cylinder is arranged outside the needle cylinder main shaft Zhou Peige, jacquard needles are arranged on the needle cylinder, the jacquard needles are correspondingly provided with knitting needles and control the positions of the knitting needles, the jacquard needles are controlled by the needle selecting devices through matching with needle selecting steel rings, at least two needle selecting devices are also arranged on the periphery of the needle cylinder, and the two needle selecting devices are both bidirectional needle selecting devices; the two bidirectional needle selectors control the knitting needles corresponding to the jacquard needles to be positioned at needle hiding positions when the jacquard needles are selected in the previous step, and the jacquard needles run needle hiding tracks along the bottom edge of the needle selecting steel ring; when the previous two-way needle selector selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be positioned at the tuck needle positions, and the jacquard needles move the tuck track along the tuck track grooves in the needle selecting steel rings; when two bidirectional needle selectors do not select jacquard needles, the knitting needles corresponding to the jacquard needles are positioned at the looping needle positions, and the jacquard needles move along the tops of the needle selecting steel rings to form looping tracks. The invention changes the needle moving system which can only complete the forward and backward bidirectional control of the needle hiding track, the tucking track and the looping track by at least three needle selectors into at least two bidirectional needle selectors which are matched with the needle hiding track, the tucking track groove and the looping track on the needle selecting steel ring to realize the same function, thereby greatly reducing the manufacturing cost of equipment, leaving enough installation space to improve the equipment performance of knitting machinery, simultaneously slowing down the gradient of the needle selecting steel ring and improving the running rotating speed of the machine. Obviously, the needle cylinder main shaft under the structure rotates positively or reversely, and corresponding needles can be controlled through the jacquard needles of the two bidirectional needle selectors, so that the needle hiding position, the tucking position and the looping position track of the needles can be controlled.
The needle selecting steel ring is of a round structure as a whole, and two steel rings of the needle lifting steel ring sheet and the track steel ring sheet are combined into a group, and are mutually arranged and surrounded to form the round structure; the needle lifting steel ring sheet and the track steel ring sheet are of an integrated structure or of a split structure. The jacquard needle starting point in the needle cylinder forward and backward rotation process is adopted as the jacquard needle starting point, the defect that two unidirectional needle selectors with different positions are matched with a bidirectional needle selector to work due to different needle starting points of a circle removing and collecting track in the forward and backward rotation process of the traditional needle selecting steel ring is effectively overcome, and the technical purpose of forward and backward rotation needle track control of the two bidirectional needle selectors is realized by utilizing the needle starting function of the needle starting steel ring sheet
The bottom of the inner side surface of the track steel ring sheet is provided with a needle hiding track, the middle of the inner side surface is provided with a ring collecting track groove, and the top of the track steel ring sheet is provided with a looping track.
The needle hiding track is arranged at the bottom of the inner side surface of the needle lifting steel ring sheet, the needle hiding track guide groove is arranged in the middle of the inner side surface, and the needle lifting steel ring sheet top is provided with a needle waiting track.
The needle cylinder is divided into an upper needle cylinder and a lower needle cylinder, the lower needle cylinder is concentrically fixed on the shaft shoulder end surface of the needle cylinder main shaft through an inner hole, and the upper needle cylinder is concentrically sleeved on the outer circle of the needle cylinder main shaft through the inner hole and is positioned at the upper end of the lower needle cylinder. The outer walls of the upper needle cylinder and the lower needle cylinder are provided with axial grooves, jacquard needles and needle selecting pieces are arranged in the axial grooves, the jacquard needles are positioned at the inner sides of the axial grooves, and the needle selecting pieces are arranged at the outer sides of the axial grooves through barrel springs. The bidirectional needle selector selects needle selection sheets, and the radial movement of jacquard needles is controlled by the needle selection sheets. The jacquard needle and the needle selecting sheet are positioned in the axial grooves on the outer walls of the upper needle cylinder and the lower needle cylinder, the jacquard needle is positioned at the inner side of the axial groove, the needle selecting sheet is fixed at the outer side of the axial groove through the barrel spring in the spring groove of the lower needle cylinder, and the technical structure that the jacquard needle is matched with the needle selecting steel ring to axially move and the needle selecting sheet axially does not move is achieved.
Eight bidirectional needle selectors are arranged on the periphery of the needle cylinder, one bidirectional needle selector on one group of two bidirectional needle selectors is matched with one bidirectional needle selector on the other group to form a needle moving system for controlling jacquard needles. The eight bidirectional needle selectors form four paths, and each path corresponds to one yarn feeding port for controlling the needle moving system of the jacquard needle. The four-way bidirectional needle selector controls the needle moving system, the whole needle cylinder is divided into four parts, the control performance of the bidirectional needle selector on jacquard needles is further improved, and the further speed increase of the needle cylinder main shaft is realized.
The invention changes the needle moving system which can only complete the forward and backward bidirectional control of the needle hiding track, the tucking track and the looping track by at least three needle selectors into at least two bidirectional needle selectors which are matched with the needle hiding track, the tucking track groove and the looping track on the needle selecting steel ring to realize the same function, thereby greatly reducing the manufacturing cost of equipment, leaving enough installation space to improve the equipment performance of knitting machinery, simultaneously slowing down the gradient of the needle selecting steel ring and improving the running rotating speed of the machine.
Drawings
FIG. 1 is a schematic diagram of a four-way needle moving system of a conventional knitting machine;
FIG. 2 is a schematic diagram of a needle position control of a four-way needle moving system of a conventional forward rotary knitting machine;
FIG. 3 is a schematic diagram of a needle position control of a four-way needle moving system of a conventional reverse rotary knitting machine;
FIG. 4 is a schematic view of a needle moving system of the knitting machine of the present invention with two bi-directional needle selectors as one path;
FIG. 5 is a schematic diagram of the needle position control of the four-way needle system of the present invention;
FIG. 6 is a schematic view of a jacquard needle structure according to the present invention;
FIG. 7 is a schematic view of a select jack structure of the present invention;
FIG. 8 is a schematic diagram of the structure of a steel ring of a selection needle in the invention;
FIG. 9 is a schematic view of the structure of the steel track ring sheet in the present invention;
fig. 10 is a schematic view of the structure of the needle lifting steel ring sheet in the invention.
Detailed Description
Referring to fig. 4-10, the needle selecting system for knitting machine comprises a needle cylinder main shaft 17 arranged on a large flat plate 16, a needle cylinder is arranged on the periphery of the needle cylinder main shaft 17 in a matched manner, jacquard needles 14 are arranged on the needle cylinder, the jacquard needles 14 are correspondingly provided with knitting needles and control the positions of the knitting needles, the jacquard needles 14 are controlled by the needle selecting devices through matching with a needle selecting steel ring 15, at least two needle selecting devices are also arranged on the periphery of the needle cylinder, and the two needle selecting devices are two-way needle selecting devices. When the previous two-way needle selector 20 selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be positioned at needle hiding positions, and the jacquard needles run needle hiding tracks along the bottom edges of the needle selecting steel rings; when the previous two-way needle selector selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be positioned at the tuck needle positions, and the jacquard needles move the tuck track along the tuck track grooves in the needle selecting steel rings; when two bidirectional needle selectors do not select jacquard needles, the knitting needles corresponding to the jacquard needles are positioned at the looping needle positions, and the jacquard needles move along the tops of the needle selecting steel rings to form looping tracks. The two bidirectional needle selectors are fixedly connected with the large flat plate 16 through a needle selector base 18 and a needle selector base 19 respectively. The needle cylinder main shaft 17 rotates positively or reversely, and corresponding knitting needles can be controlled through jacquard needles by two bidirectional needle selectors, so that the control of needle hiding positions, tucking positions and looping needle position tracks of the knitting needles is realized.
The whole needle selecting steel ring 15 is of a circular structure as a structure, and two steel rings of the needle lifting steel ring sheet 25 and the track steel ring sheet 24 are formed into a group, and are mutually arranged and surrounded to form the circular structure; the needle lifting steel ring piece 25 and the track steel ring piece 24 are of an integral structure or of a split structure. The needle lifting steel ring sheet structure is used as a jacquard needle lifting point in the forward and reverse rotation process of a needle cylinder, the defect that two unidirectional needle selectors with different positions are matched with a bidirectional needle selector to work because of different needle lifting points of a circle removing track in the forward and reverse rotation process of a traditional needle lifting steel ring is effectively solved, the technical purpose of forward and reverse rotation needle lifting track control of the two bidirectional needle selectors is realized by utilizing the needle lifting function of the needle lifting steel ring sheet, and the needle lifting steel ring sheet structure is specifically characterized in that a needle hiding track 33 is arranged at the bottom of the inner side surface of the needle lifting steel ring sheet 25, a needle hiding track guide groove 32 is arranged in the middle of the inner side surface, and a needle lifting track 31 to be selected is arranged at the top of the needle lifting steel ring sheet. Needle hiding track 28 is arranged at the bottom of the inner side surface of the track steel ring piece 24, a ring collecting track groove 26 is arranged in the middle of the inner side surface, and a ring forming track 27 is arranged at the top of the track steel ring piece 24.
In order to further improve the processing performance of the equipment, the needle cylinder is divided into an upper needle cylinder 13 and a lower needle cylinder 22, the lower needle cylinder 22 is concentrically fixed on the shaft shoulder end surface of the needle cylinder main shaft 17 through an inner hole, and the upper needle cylinder is concentrically sleeved on the outer circle of the needle cylinder main shaft through the inner hole and is positioned at the upper end of the lower needle cylinder.
The structure is that the outer walls of the upper needle cylinder and the lower needle cylinder are preferably provided with axial grooves, jacquard needles and needle selecting pieces are arranged in the axial grooves, the jacquard needles are positioned at the inner sides of the axial grooves, and the needle selecting pieces 23 are arranged at the outer sides of the axial grooves through the barrel springs 12. The jacquard needle 14 and the needle selecting piece 23 are positioned in the axial grooves on the outer walls of the upper needle cylinder and the lower needle cylinder, the jacquard needle is positioned at the inner side of the axial groove, the needle selecting piece is fixed at the outer side of the axial groove through the barrel spring in the spring groove of the lower needle cylinder, and the structure is designed in a split mode by the jacquard needle and the needle cylinder, so that the needle selecting piece 23 can synchronously rotate with the lower needle cylinder or can swing inside and outside under the action of the bidirectional needle selector and the jacquard needle, and is not displaced in the axial direction all the time and is positioned at the same height, and the bidirectional needle selector can conveniently perform combined needle selection at the same height.
In order to further improve the control performance, the rotating speed of the needle cylinder main shaft 17 is increased, eight bidirectional needle selectors are also arranged on the periphery of the needle cylinder, one bidirectional needle selector on one group of two bidirectional needle selectors is matched with one bidirectional needle selector on the other group to form a needle moving system for controlling jacquard needles. The eight bidirectional needle selectors form four paths, and each path corresponds to one yarn feeding port for controlling the needle moving system of the jacquard needle.
The specific test example scheme of the needle moving track of the invention is as follows: when the previous bidirectional needle selector 20 selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be positioned at needle hiding positions, the jacquard needles slide down to needle hiding guide grooves 32 on the needle lifting steel ring pieces 25 under the action of the bidirectional needle selector 20, and then move to needle hiding tracks 28 at the bottoms of the inner side surfaces of the track steel ring pieces 24 along needle hiding tracks 33 under the action of the needle hiding guide grooves 32 to complete a needle hiding track needle moving system in a circulating way; when the previous two-way needle selector 20 does not select needles and the next two-way needle selector 21 (the needle selector position is set according to the requirement) selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be in a tucking needle position, and the jacquard needles move along a to-be-selected needle track 31 on a needle lifting steel ring piece 25 to enter a tucking track groove 26 on the track steel ring piece 24 after passing through a first track edge 30 to a second track edge 29 on the track steel ring piece 24 to complete a tucking track needle moving system in a circulating way; when the jacquard needles are not selected by the two bidirectional needle selectors, the knitting needles corresponding to the jacquard needles are positioned at the looping needle positions, and the jacquard needles move to the looping track 27 at the top of the track steel ring piece 24 along the looping track 27 at the top of the needle lifting steel ring piece 25 to complete the looping track needle moving system in a circulating way.
As a four-way needle-moving system, namely four groups of two-way needle selectors, 4 sets of needle lifting steel ring pieces 25 and track steel ring pieces 24 are jointly matched to form a complete circle in a surrounding mode, and the four-way two-way needle-moving system is achieved by combining four yarn feeding ports, so that a high-quality knitting effect is achieved.
Claims (7)
1. The utility model provides a knitting machine is with line needle system that two-way needle selector are one way, includes the cylinder main shaft of installing on big flat board, and the cylinder is installed to the outer Zhou Peige of cylinder main shaft, is equipped with the jacquard needle on the cylinder, and the jacquard needle is to being equipped with the knitting needle to control the position of knitting needle, and the jacquard needle is controlled by needle selector through the cooperation needle selection steel ring, its characterized in that: at least two needle selectors are arranged on the periphery of the needle cylinder, and the two needle selectors are two-way needle selectors; the two bidirectional needle selectors control knitting needles corresponding to jacquard needles to be positioned at needle hiding positions when the jacquard needles are selected by the previous bidirectional needle selector, and the jacquard needles move along needle hiding tracks along the bottom edge of the needle selecting steel ring; when the previous two-way needle selector selects jacquard needles, the knitting needles corresponding to the jacquard needles are controlled to be positioned at the tuck needle positions, and the jacquard needles move the tuck track along the tuck track grooves in the needle selecting steel rings; when two bidirectional needle selectors do not select jacquard needles, the knitting needles corresponding to the jacquard needles are positioned at the looping needle positions, and the jacquard needles move along the tops of the needle selecting steel rings to form looping tracks;
the needle selecting steel ring is of a round structure as a whole, and two steel rings of the needle lifting steel ring sheet and the track steel ring sheet are combined into a group, and are mutually arranged and surrounded to form the round structure; the needle lifting steel ring sheet and the track steel ring sheet are of an integrated structure or of a split structure;
the bottom of the inner side surface of the track steel ring sheet is provided with a needle hiding track, the middle of the inner side surface is provided with a ring collecting track groove, and the top of the track steel ring sheet is provided with a ring forming track;
the needle hiding track is arranged at the bottom of the inner side surface of the needle lifting steel ring sheet, the needle hiding track guide groove is arranged in the middle of the inner side surface, and the needle lifting steel ring sheet top is provided with a needle waiting track.
2. A needle moving system for a knitting machine with two bi-directional needle selectors as claimed in claim 1, characterized in that: the needle cylinder is divided into an upper needle cylinder and a lower needle cylinder, the lower needle cylinder is concentrically fixed on the shaft shoulder end surface of the needle cylinder main shaft through an inner hole, and the upper needle cylinder is concentrically sleeved on the outer circle of the needle cylinder main shaft through the inner hole and is positioned at the upper end of the lower needle cylinder.
3. A needle moving system for a knitting machine with two bi-directional needle selectors as claimed in claim 2, characterized in that: the jacquard needle is positioned at the inner side of the axial groove, and the needle selecting piece is arranged at the outer side of the axial groove through a barrel spring.
4. A needle moving system for a knitting machine with two bi-directional needle selectors as claimed in claim 3, characterized in that: the jacquard needle and the needle selecting sheet are positioned in the axial grooves on the outer walls of the upper needle cylinder and the lower needle cylinder, the jacquard needle is positioned at the inner side of the axial groove, and the needle selecting sheet is fixed at the outer side of the axial groove through the barrel spring in the spring groove of the lower needle cylinder.
5. A needle moving system for a knitting machine with two bi-directional needle selectors as defined in claim 4 wherein: the jacquard needle is matched with the needle selecting steel ring to axially move, and the needle selecting piece does not axially move.
6. A needle moving system for a knitting machine with two bi-directional needle selectors as claimed in claim 1, characterized in that: eight bidirectional needle selectors are arranged on the periphery of the needle cylinder, one group of two bidirectional needle selectors is arranged on one adjacent group, and a needle running system for controlling jacquard needles is formed by matching with the bidirectional needle selectors on the other group; the eight bidirectional needle selectors form four paths, and each path corresponds to one yarn feeding port for controlling the needle moving system of the jacquard needle.
7. A needle moving system for a knitting machine with two bi-directional needle selectors as claimed in claim 1, characterized in that: the needle cylinder main shaft rotates positively or reversely, and can control corresponding knitting needles through jacquard needles by two bidirectional needle selectors, so that the control of needle hiding positions, tucking positions and looping needle position tracks of the knitting needles is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465168.2A CN110093711B (en) | 2019-05-30 | 2019-05-30 | Needle moving system with two bidirectional needle selecting devices as one path for knitting machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465168.2A CN110093711B (en) | 2019-05-30 | 2019-05-30 | Needle moving system with two bidirectional needle selecting devices as one path for knitting machinery |
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| Publication Number | Publication Date |
|---|---|
| CN110093711A CN110093711A (en) | 2019-08-06 |
| CN110093711B true CN110093711B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910465168.2A Active CN110093711B (en) | 2019-05-30 | 2019-05-30 | Needle moving system with two bidirectional needle selecting devices as one path for knitting machinery |
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| CN111501185B (en) * | 2020-04-29 | 2022-03-08 | 李志文 | Knitting machine |
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| CN205893571U (en) * | 2016-07-26 | 2017-01-18 | 浙江叶晓针织机械有限公司 | Footwear machine constructs with positive and negative needle function of selecting |
| CN108754822A (en) * | 2017-04-24 | 2018-11-06 | 圣东尼股份公司 | The method of circular knitter and needle for moving circular knitter |
| CN108914359A (en) * | 2018-09-05 | 2018-11-30 | 佛山市三创针织有限公司 | A kind of multistation knitting needle control device of novel hosiery machinery |
| CN210113298U (en) * | 2019-05-30 | 2020-02-25 | 浙江罗速设备制造有限公司 | Needle moving system with two bidirectional needle selectors as one path for knitting machinery |
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| CN110093711A (en) | 2019-08-06 |
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