A needle selection device and method for knitting machines based on electrically conductive stretchable metal wires

Abstract

This invention discloses a needle selection device and method for knitting machines based on electrically conductive stretchable metal wires. The device includes a needle plate and a needle bed. The needle bed has several spaced-apart needle grooves, each containing a needle foot and a needle-lifting plate. The needle-lifting plate is mounted on a shaft, and the needle foot rotates and abuts against the needle-lifting plate. One end of the needle-lifting plate has a pin, on which a memory metal wire is attached. The two ends of the memory metal wire are connected to a positive terminal and a negative terminal, respectively. This invention features a simple control method. It only requires pre-designing the energizing and de-energizing times and intervals of each memory metal wire according to the needle selection scheme to complete the needle selection and knitting process. The memory metal wire contracts when energized and returns to its original shape when de-energized. It involves fewer parts, has lower manufacturing costs, occupies less space, and has a lower failure rate, providing an advanced method for needle selection in the knitting machinery industry.

Description

Technical Field

[0001] This invention relates to the field of knitting equipment technology, and in particular to a needle selection device and method for knitting machines based on electrically conductive stretchable metal wires. Background Technology

[0002] Currently, there are generally two methods for needle selection in knitting machines: one is using an electromagnetic needle selector, and the other is using a needle selector cylinder. When using an electromagnetic needle selector, the selector itself is expensive to manufacture, and the accompanying accessories such as needle selector plates, needle feet, and needle heels are numerous, with complex manufacturing processes and high costs, thus limiting its widespread adoption. On the other hand, while using a needle selector cylinder has lower manufacturing costs, it only allows for fixed needle selection based on the cylinder's mechanical structure, limiting the use of only one or a few selection methods and preventing arbitrary needle selection, which is very inconvenient.

[0003] To reduce the cost of needle selection and improve its efficiency, many people in the industry are researching alternative methods for needle selection, but there has not been much progress yet, and this is a problem that the industry urgently needs to solve. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a needle selection device and method for knitting machines based on electrically conductive stretchable metal wires.

[0005] The technical solution adopted in this invention is: a needle selection device for a knitting machine based on an electrically conductive stretchable metal wire, used to select needles for participation in knitting, wherein the knitting machine includes:

[0006] The needle plate is fixed to the machine frame;

[0007] A needle bed is mounted on a needle plate, with its own length direction as the longitudinal direction. The needle bed has several spaced-apart needle bed inserts along its longitudinal direction, and needle grooves are provided between adjacent needle bed inserts.

[0008] The needles are housed in the needle grooves;

[0009] The needle-feather plate has one end inserted into the needle groove, and the needle-feather plate is provided with an adapter for the needle foot to abut;

[0010] The knitting machine is characterized in that the needle-feather piece is provided with a shaft hole and a hanging pin, wherein the hanging pin is disposed at the end of the needle-feather piece, and the knitting machine further includes:

[0011] The shaft passes through the shaft hole on all of the said needlebird plates;

[0012] The mounting bracket is fixed to one side of the needle plate;

[0013] A positive electrode mounting assembly is fixed on the mounting bracket and has a plurality of positive electrode contacts corresponding to each hanging pin along the longitudinal direction;

[0014] A negative electrode mounting assembly is fixed on the mounting bracket and has a plurality of negative electrode contacts corresponding to each hanging pin along the longitudinal direction.

[0015] A shape memory wire is attached to the hanging pin, with its two ends connected to the positive terminal and the negative terminal, respectively.

[0016] The positive and negative contacts corresponding to the same pin and the memory metal wire together constitute an electronically controlled drive component;

[0017] The central processing unit, mounted on the rack, is used to control the power supply to various electronically controlled drive components;

[0018] The electronically controlled drive assembly has an on-state and a off-state. In the on-state, the memory metal wire is energized and retracts, pulling the hanging pin downward. The side of the needle bird piece away from the hanging pin rotates upward around the shaft, and the needle foot rotates around the adapter position and rises. In the off-state, the memory metal wire returns to its original shape, and the needle bird piece and the needle foot are both located in the needle groove.

[0019] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0020] Preferably, the positive electrode mounting assembly includes at least one PCB board, and one end of the shape memory wire is fixed to one of the PCB boards by a fixing screw to form the positive electrode contact.

[0021] Preferably, there are two PCBs, designated as a first PCB and a second PCB. The first PCB is fixed to a mounting bracket and has a positioning plate fixed to it. The second PCB is fixed to the positioning plate by nylon spacers. One end of a shape memory wire is fixed to the second PCB with a screw; this end serves as the positive terminal. The first and second PCBs work together to achieve positive conductivity. The shape memory wire on the first PCB passes through the positioning plate and is then electrically connected to the second PCB.

[0022] Preferably, the negative electrode mounting assembly includes:

[0023] The fixing plate is fixed on the mounting bracket;

[0024] An mounting plate is fixed to the fixing plate. The mounting plate has several mounting slots spaced along its length. One end of the memory metal wire is fixed in the mounting slot and forms the negative terminal.

[0025] Preferably, the knitting machine further includes:

[0026] There are two needle-blocking plates, both of which are fixed on the machine frame. The two needle-blocking plates are arranged on the left and right sides of the needle bed.

[0027] The needle plate is provided with a shaft hole for the end of the shaft to be inserted into.

[0028] Preferably, a first pressure plate is fixed above the two needle-blocking plates. The first pressure plate is positioned above the needle-piercing bird piece. A grid frame is fixed on the first pressure plate. The grid frame has several spaced-apart openings along its length. At least a portion of the needle-piercing bird piece extends from below into the openings.

[0029] Preferably, a second pressure plate is provided above the needle bed along the longitudinal direction, and a plurality of slots are provided on the lower end surface of the second pressure plate for the corresponding insertion of the needle bed inserts.

[0030] Preferably, the longitudinal direction is the left-right direction, and the planes corresponding to all the memory metal wires are arranged along the front-back direction and are parallel to each other.

[0031] More preferably, the position of the hook pin is lower than the position of the shaft.

[0032] A needle selection method for a knitting machine based on an electrically conductive stretchable metal wire, wherein the knitting machine has a needle bed with needle grooves spaced at certain intervals along its length, needle feet and needle guides are provided in the needle grooves, the needle guides are rotatably connected to a shaft, the needle feet rotate and abut against the needle guides, one end of the needle guides is provided with a pin, a memory metal wire is hung on the pin, and the two ends of the memory metal wire are respectively connected to a positive terminal and a negative terminal, characterized by the following steps:

[0033] S1. Provide a pin selection scheme and input the pin selection scheme into the programming program in the central processing unit;

[0034] S2. According to the needle selection scheme, the central processing unit controls the energization of different memory metal wires;

[0035] S3. When one or more memory metal wires are energized, the memory metal wires contract and pull the hanging pin downward. The side of the needle bird plate away from the hanging pin rotates upward around the shaft and drives the needle to rise.

[0036] S4. The needles corresponding to the energized memory metal wires are selected and participate in the knitting of the knitting machine.

[0037] S5. When the energized memory metal wire does not need to participate in needle selection, the positive and negative terminals corresponding to the memory metal wire are de-energized, the memory metal wire returns to its original state, the hanging pin loses its force, the needle clip is reset downwards by its own weight and elasticity, and the needle foot corresponding to the needle clip returns to its original position.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. By inputting the needle selection scheme into the programming program in the central processing unit, after the device is started, the central processing unit can control the power supply and de-energization of each memory metal wire. When the memory metal wire is energized, it will contract, which will drive the pin at the end of the needle piercing plate to move downward. At this time, according to the lever principle, the end of the needle piercing plate away from the pin will rotate upward around the shaft, and drive the needle to rise, so that this needle will participate in the knitting machine. When the memory metal wire is de-energized, it will return to its original state, and the needle piercing plate will return to its original position under its own gravity and elastic force. The needle corresponding to the needle piercing plate will not participate in the knitting.

[0040] 2. The control method is simple. It only requires designing the energizing and de-energizing time and interval of each memory metal wire in advance according to the needle selection scheme to perfectly complete the needle selection and knitting. It involves fewer parts, has a lower manufacturing cost, occupies less space, and has a low failure rate, providing an advanced method for needle selection schemes in the knitting machinery industry. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 This is a schematic planar diagram illustrating the principle of the memory metal wire contracting to drive the needle selection in a powered state according to one embodiment of this application;

[0043] Figure 2 This is a schematic diagram illustrating the principle of the memory metal wire returning to its original state and the needles not participating in needle selection and knitting in a power-off state according to one embodiment of this application.

[0044] Figure 3 This is a front-view overall structural diagram of the needle plate, needle bed, and functional components related to needle selection in one embodiment of this application.

[0045] Figure 4 for Figure 3 Enlarged view of part A in the image;

[0046] Figure 5 This is a rear-view structural diagram of the needle plate, needle bed, and functional components related to needle selection in one embodiment of this application.

[0047] Figure 6 This is a schematic diagram of the structure of one of the shape memory metal wires after power is turned off in one embodiment of this application;

[0048] Figure 7 for Figure 6 Enlarged view of part B in the image;

[0049] Figure 8 This is a schematic diagram of the structure of one of the shape memory metal wires after being energized in one embodiment of this application;

[0050] Figure 9 for Figure 8 A magnified view of part C in the image.

[0051] The attached diagram is labeled as follows: a-memory metal wire, 1-needle plate, 2-needle stop plate, 3-needle bed, 301-needle bed insert, 4-grid frame, 401-through port, 5-shaft, 6-positive electrode mounting assembly, 601-first PCB board, 602-positioning plate, 603-second PCB board, 604-fixing screw, 7-negative electrode mounting assembly, 701-fixing plate, 702-mounting plate, 7021-mounting slot, 8-needle ejector plate, 801-hanging pin, 9-needle foot, 10-first pressure plate, 1001-pad, 11-mounting bracket, 12-second pressure plate.

[0052] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0055] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0056] Detailed implementation plan: See below Figures 1-9 This invention relates to a needle selection device for a knitting machine based on an electrically conductive, stretchable metal wire. The device is used to select needles for use in knitting. The knitting machine includes:

[0057] Needle plate 1 is fixed on the machine frame;

[0058] The needle bed 3 is mounted on the needle plate 1. The length direction of the needle bed 3 is set as the longitudinal direction. The needle bed 3 has several needle bed 3 inserts spaced apart along the longitudinal direction. There are needle grooves between adjacent needle bed 3 inserts.

[0059] Needle 9 is housed in each needle groove;

[0060] The needle-feather plate 8 has one end inserted into the needle groove, and the needle-feather plate 8 has an adapter for the needle foot 9 to abut;

[0061] The feature is that the needle-feather plate 8 is provided with a shaft hole and a hanging pin 801, wherein the hanging pin 801 is provided at the end of the needle-feather plate 8, and the knitting machine further includes:

[0062] Shaft 5 passes through the shaft holes on all the catapult plates 8;

[0063] Mounting bracket 11 is fixed to one side of needle plate 1;

[0064] The positive electrode mounting component 6 is fixed on the mounting bracket 11 and has a number of positive electrode contacts corresponding to each hanging pin 801 along its length.

[0065] The negative electrode mounting component 7 is fixed on the mounting bracket 11 and has several negative electrode contacts along its length corresponding to each hanging pin 801.

[0066] The shape memory wire a is attached to the hanging pin 801, and its two ends are connected to the positive terminal and the negative terminal respectively;

[0067] The positive and negative contacts and the memory metal wire a corresponding to the same pin 801 together constitute an electronically controlled drive component.

[0068] The central processing unit, mounted on the rack, is used to control the power supply to various electronically controlled drive components;

[0069] The electronically controlled drive assembly has an on-state and an off-state. In the on-state, the memory metal wire a retracts and pulls the hanging pin 801 downward. The side of the needle bird plate 8 away from the hanging pin 801 rotates upward around the shaft 5, and the needle 9 rotates around the transition position and rises. In the off-state, the memory metal wire a returns to its original state, and both the needle bird plate 8 and the needle 9 are located in the needle groove.

[0070] In this embodiment, the shape memory wire a is a nickel-titanium-copper alloy. Of course, a bimetallic alloy, such as a manganese-nickel-copper alloy, a nickel-chromium-iron alloy, or a nickel-manganese-iron alloy, can also be used. When the shape memory wire a is energized, it will immediately shrink.

[0071] In a preferred embodiment of this invention, the positive electrode mounting assembly 6 includes at least one PCB board, and one end of the memory metal wire a is fixed to one of the PCB boards by a fixing screw 604 to form a positive electrode contact.

[0072] Please see Figure 3 and Figure 4 As can be seen in this embodiment, there are two PCBs, namely a first PCB 601 and a second PCB 603. The first PCB 601 is fixed to the mounting bracket 11, and a positioning plate 602 is fixed to the first PCB 601. The second PCB 603 is fixed to the positioning plate 602 by nylon pads. One end of the shape memory wire a is fixed to the second PCB 603 by a fixing screw 604, which is the positive terminal. The first PCB 601 and the second PCB 603 work together to complete the positive electrode conduction. The shape memory wire a on the first PCB 601 is electrically connected to the second PCB 603 after passing through the positioning plate 602.

[0073] Then, the negative electrode mounting component 7 includes:

[0074] The fixing plate 701 is fixed on the mounting bracket 11;

[0075] Mounting plate 702 is fixed on fixing plate 701. Mounting plate 702 has several mounting slots 7021 spaced along its length. One end of memory metal wire a is fixed in the mounting slot 7021 and forms a negative terminal.

[0076] Here, the positive mounting component 6 and the negative mounting component 7 are used to supply power to the memory metal wire a and to facilitate the control of the power supply of each memory metal wire a.

[0077] Please see Figures 5-7 As can be seen, the knitting machine also includes:

[0078] Two needle-blocking plates 2 are fixed on the machine frame, and the two needle-blocking plates 2 are arranged on the left and right sides of the needle bed 3.

[0079] The needle stop plate 2 is provided with a shaft hole for the end of the shaft rod 5 to be inserted.

[0080] Then, a first pressure plate 10 is fixed above the two needle-blocking plates 2. The first pressure plate 10 is set above the needle-shooting bird piece 8. A grid frame 4 is fixed on the first pressure plate 10. The grid frame 4 has a number of mutually spaced openings 401 along its length. At least a portion of the needle-shooting bird piece 8 extends from below into the openings 401.

[0081] In this embodiment, a second pressure plate 12 is provided above the needle bed 3 along the longitudinal direction, and a plurality of slots are provided on the lower end surface of the second pressure plate 12 for the corresponding matching insertion of the needle bed 3 inserts.

[0082] Here, the needle stop plate 2 is mainly used to facilitate the installation of the first pressure plate 10, the second pressure plate 12, and the shaft 5. The shaft 5 provides a pivot point for the needle ejector plate 8. When energized, the first pressure plate 10 limits the upper part of the needle ejector plate 8. In addition, multiple slots are provided on the lower end surface of the second pressure plate 12 to separate the needle bed 3 inserts, so that the spacing between the needle slots does not change.

[0083] In another preferred embodiment of this invention, the longitudinal direction is left-right, and the planes corresponding to all memory metal wires a are arranged along the front-back direction and are parallel to each other. Here, it is equivalent to the plane containing the memory metal wire a being perpendicular to the longitudinal direction, which makes it appear neater and prevents adjacent memory metal wires a from intersecting or interfering with each other.

[0084] More specifically, in this embodiment, the position of the pin 801 is lower than the position of the shaft 5.

[0085] Operating principle: The positive and negative contacts are connected to the positive and negative terminals of the DC power supply, respectively. Please refer to [link / reference]. Figure 1 When the electronically controlled drive assembly is energized, i.e., the DC power supply powers the memory metal wire a, the memory metal wire a will contract, thereby driving the pin 801 located at the end of the needle-feather plate 8 to move downward. At this time, according to the lever principle, the end of the needle-feather plate 8 away from the pin 801 rotates upward around the shaft 5. Since the needle-feather plate 8 has a transition position for the needle 9 to rotate and abut, when the needle-feather plate 8 rotates counterclockwise, the needle 9 will rotate clockwise and rise with the needle-feather plate 8, thus the needle participates in the knitting of the knitting machine. Please refer to Figure 2When the memory metal wire a is de-energized, the memory metal wire a will return to its original state. The downward pull of the memory metal wire a on the hanging pin 801 will disappear. The needle bird plate 8 will return to its original position under its own gravity and elastic force (i.e., it will rotate clockwise). At this time, the needle 9 will also return to its original position with the needle bird plate 8 (i.e., it will rotate counterclockwise) and be hidden inside the needle groove. The knitting needle corresponding to the needle bird plate 8 will not participate in knitting.

[0086] A needle selection method for a knitting machine based on an electrically conductive stretchable metal wire, wherein the knitting machine has a needle bed 3 with needle grooves spaced at certain intervals along its length, needle feet 9 and needle guides 8 are provided in the needle grooves, the needle guides 8 are rotatably connected to a shaft 5, the needle feet 9 rotatably abut against the needle guides 8, one end of the needle guides 8 is provided with a hanging pin 801, on which a memory metal wire a is hung, and the two ends of the memory metal wire a are respectively connected to a positive terminal and a negative terminal, characterized by the following steps:

[0087] S1. Provide a pin selection scheme and input the pin selection scheme into the programming program in the central processing unit;

[0088] S2. According to the needle selection scheme, the central processing unit controls the energization of different memory metal wires a;

[0089] S3. When one or more memory metal wires a are energized, the memory metal wire a contracts and pulls the hanging pin 801 downward. The side of the needle bird piece 8 away from the hanging pin 801 rotates upward around the shaft 5 and drives the needle 9 to rise.

[0090] S4. The needle 9 corresponding to the energized memory metal wire a is selected and participates in the knitting of the knitting machine.

[0091] S5. When the energized memory metal wire a does not need to participate in needle selection, the positive and negative terminals corresponding to the memory metal wire a are de-energized, the memory metal wire a returns to its original state, the hanging pin 801 loses its force, the needle bird piece 8 resets downward under its own weight and elasticity, and the needle foot 9 corresponding to the needle bird piece 8 descends to its original position.

[0092] In summary, when it's necessary to adjust which needles 9 participate in needle selection and when needle selection occurs, the needle selection scheme can be pre-programmed into the central processing unit. When the memory metal wire a is energized, as described above, the corresponding needle 9 will rise, allowing that needle to participate in the knitting machine. When the memory metal wire a is de-energized, as described above, the corresponding needle 9 will descend, ending its participation in the knitting machine.

[0093] The core of this invention lies in:

[0094] By utilizing the material properties of shape memory metal wires—which shrink when energized and reset when de-energized—this material can be applied to the needle selection structure of knitting equipment to achieve the purpose of needle selection in knitting machinery.

[0095] The needle selection device and method for a knitting machine based on electrically conductive stretchable metal wire of the present invention are described above only as preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire, used to select needles for participation in knitting, the knitting machine comprising: The needle plate is fixed to the frame; A needle bed is mounted on a needle plate, with its own length direction as the longitudinal direction. The needle bed has several spaced-apart needle bed inserts along its longitudinal direction, and needle grooves are provided between adjacent needle bed inserts. The needles are housed in the needle grooves; The needle-feather plate has one end inserted into the needle groove, and the needle-feather plate is provided with an adapter for the needle foot to abut; The knitting machine is characterized in that the needle-feather piece is provided with a shaft hole and a hanging pin, wherein the hanging pin is disposed at the end of the needle-feather piece, and the knitting machine further includes: The shaft passes through the shaft hole on all of the said needlebird plates; The mounting bracket is fixed to one side of the needle plate; A positive electrode mounting assembly is fixed on the mounting bracket and has a plurality of positive electrode contacts corresponding to each hanging pin along the longitudinal direction; A negative electrode mounting assembly is fixed on the mounting bracket and has a plurality of negative electrode contacts corresponding to each hanging pin along the longitudinal direction. A shape memory wire is attached to the hanging pin, with its two ends connected to the positive terminal and the negative terminal, respectively. The positive and negative contacts corresponding to the same pin and the memory metal wire together constitute an electronically controlled drive component; The central processing unit, mounted on the rack, is used to control the power supply to various electronically controlled drive components; The electronically controlled drive assembly has an on-state and a off-state. In the on-state, the memory metal wire is energized and retracts, pulling the hanging pin downward. The side of the needle bird piece away from the hanging pin rotates upward around the shaft, and the needle foot rotates around the adapter position and rises. In the off-state, the memory metal wire returns to its original shape, and the needle bird piece and the needle foot are both located in the needle groove.

2. The needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 1, characterized in that, The positive electrode mounting assembly includes at least one PCB board, and one end of the memory metal wire is fixed to one of the PCB boards by a fixing screw, forming the positive electrode contact.

3. The needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 2, characterized in that, The negative electrode mounting assembly includes: The fixing plate is fixed on the mounting bracket; An mounting plate is fixed to the fixing plate. The mounting plate has several mounting slots spaced along its length. One end of the memory metal wire is fixed in the mounting slot and forms the negative terminal.

4. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to any one of claims 1-3, characterized in that, The knitting machine also includes: There are two needle-blocking plates, both of which are fixed on the machine frame. The two needle-blocking plates are arranged on the left and right sides of the needle bed. The needle plate is provided with a shaft hole for the end of the shaft to be inserted into.

5. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 4, characterized in that, A first pressure plate is fixed above the two needle-blocking plates. The first pressure plate is positioned above the needle-piercing bird piece. A grid frame is fixed on the first pressure plate. The grid frame has several spaced-apart openings along its length. At least a portion of the needle-piercing bird piece extends from below into the openings.

6. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 5, characterized in that, Above the needle bed is a second pressure plate arranged along the longitudinal direction, and the lower end surface of the second pressure plate is provided with a plurality of slots for the corresponding insertion of the needle bed inserts.

7. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 1, characterized in that, The longitudinal direction is left-right, and the planes corresponding to all the memory metal wires are arranged along the front-back direction and are parallel to each other.

8. A needle selection device for a knitting machine based on an electrically conductive stretchable metal wire according to claim 1, characterized in that, The position of the hanging pin is lower than the position of the shaft.

9. A needle selection method for a knitting machine based on an electrically conductive stretchable metal wire, wherein the knitting machine has a needle bed with needle grooves spaced at certain intervals along its length, needle feet and needle guides are provided in the needle grooves, the needle guides are rotatably connected to a shaft, the needle feet rotatably abut against the needle guides, one end of the needle guides is provided with a pin, a memory metal wire is hung on the pin, and the two ends of the memory metal wire are respectively connected to a positive terminal and a negative terminal, characterized in that... Includes the following steps: S1. Provide a pin selection scheme and input the pin selection scheme into the programming program in the central processing unit; S2. According to the needle selection scheme, the central processing unit controls the energization of different memory metal wires; S3. When one or more memory metal wires are energized, the memory metal wires contract and pull the hanging pin downward. The side of the needle bird plate away from the hanging pin rotates upward around the shaft and drives the needle to rise. S4. The needles corresponding to the energized memory metal wires are selected and participate in the knitting of the knitting machine. S5. When the energized memory metal wire does not need to participate in needle selection, the positive and negative terminals corresponding to the memory metal wire are de-energized, the memory metal wire returns to its original state, the hanging pin loses its force, the needle clip is reset downwards by its own weight and elasticity, and the needle foot corresponding to the needle clip returns to its original position.

Images