Two-color single-sided jacquard circular knitting machine with control unit coil and its control method

Abstract

The present invention relates to the technical field of textile machinery, and particularly relates to a two-color single-sided jacquard circular weft knitting machine with a control unit coil and a control method thereof, including a fixed piece, knitting needles and sinkers. The sinkers move in a direction close to or away from the fixed piece. The knitting needles include a needle bar, a needle hook and a needle tongue. The sinkers include a body and a nose. The nose extends in a direction away from the body and has a cooperative relationship with the fixed piece. The nose includes an upper surface of the nose, a lower surface of the nose and a transition surface of the nose. The present invention can accurately control the state of the unit coil, and can realize stable and controllable coverage of the unit coil during the yarn exchange and adding yarn action. The yarn has a wide adaptability, including short fiber yarns with twist or continuous filaments with network. It can be smoothly knitted, and the pattern is neat and delicate at the junction of yarn exchange, and the knitted unit coils cover each other, comparable to the fabric of digital printing.

Description

Technical Field

[0001] The invention relates to the technical field of textile machinery, and in particular to a two-color single-sided jacquard circular knitting machine with a control unit coil and a control method thereof. Background Art

[0002] In the variable-gauge weave, the loop is composed of two yarns. During the weaving process, the two yarns fed in are changed in position, so that the face yarn is sometimes above the base yarn and sometimes below the base yarn, thus forming a pattern.

[0003] When a traditional single-sided jacquard circular knitting machine is weaving a two-color pattern, the feeding position of the two yarns is changed by the structure of the yarn feeder itself or the matching structure. However, since there is still a distance between the yarn feeder and the position where the weft knitting machine implements knitting, even if the yarn feeder can immediately change the yarn position, the multiple knitting needles located far away can still grab the yarn in the unflipped position, resulting in the problem of residual image on the fabric, thereby causing product defects and poor sensory perception. The published patents CN117166124, CN114108168A, and CN112176511A all describe the knitting process of exchanging added yarns, which are the technologies of sinker control and needle control of the positive and negative overlap of two-color yarns, respectively. The precise control of the unit coil is not involved, and due to the type and characteristics of the yarn, the yarn with twist is difficult to weave, resulting in a significant limitation on the quality and diversity of the pattern. Summary of the invention

[0004] The object of the present invention is to provide a two-color single-sided jacquard circular knitting machine with a control unit yarn loop and a control method thereof, which can solve the problems of poor coverage and poor fabric texture at the turning junction of the exchange yarn pattern by controlling the yarn length of the unit coil and the mutual configuration relationship of the loop yarn position, so as to solve the problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts such technical solution:

[0006] A two-color single-sided jacquard circular knitting machine with a control unit coil, comprising a fixing plate embedded in a needle cylinder nozzle, a knitting needle moving up and down in a manner orthogonal to the fixing plate, and a sinker moving horizontally forward and backward in a manner orthogonal to the knitting needle, the sinker moving in a direction close to or away from the fixing plate, the knitting needle comprising a needle bar, a needle hook, and a needle tongue capable of opening and closing relative to the needle hook;

[0007] The sinker plate includes a plate body and a plate nose connected to the plate body, the plate nose extends in a direction away from the plate body and has a cooperative relationship with the fixed plate, and the plate nose includes a plate nose upper surface, a plate nose lower surface and a plate nose transition surface connecting the plate nose upper surface and the plate nose lower surface.

[0008] Further, the nose transition surface includes a first transition surface and a second transition surface that are connected to each other. The first transition surface is connected to the upper surface of the nose, and the second transition surface is connected to the lower surface of the nose. Both the upper surface and the lower surface of the nose are inclined surfaces that slope upward in the direction from the inside to the outside.

[0009] Further, the first transition surface is arc-shaped, and the second transition surface is an inclined surface that slopes downward in the direction from the inside to the outside.

[0010] Further, a step is provided between the nose and the sheet body. The lower surface of the nose, the step, and the upper surface of the fixed sheet form a sheet throat.

[0011] Further, the spacing of the sheet throat is greater than the diameter of a single yarn and less than the sum of the diameters of two yarns.

[0012] Further, the upper surface of the fixed sheet has a limiting inclined surface with an inclined angle opposite to that of the second transition surface.

[0013] Further, a sinker inclined surface and a fixed sheet inclined surface are also provided at the relative positions between the sinker and the fixed sheet. Both the sinker inclined surface and the fixed sheet inclined surface are inclined surfaces that slope downward in the direction from the inside to the outside, and the sinker inclined surface and the fixed sheet inclined surface are arranged in parallel; when the sinker does not interact with the fixed sheet, the height of the sinker inclined surface is lower than the height of the fixed sheet inclined surface.

[0014] To achieve the above object, the present invention also adopts the following technical solution:

[0015] A control method for a two-color single-sided jacquard circular weft knitting machine with a control unit for yarn loops, including an exchange tuck-in ground mode and a non-exchange tuck-in ground mode. Push the sinker to retract along the track. When the sinker interacts with the fixed sheet, turn on the exchange tuck-in ground mode; push the sinker to retract along the track and turn on the exchange tuck-in ground mode; do not push the sinker to retract along the track. When the sinker does not interact with the fixed sheet, turn on the non-exchange tuck-in ground mode.

[0016] When the exchange and adding yarn mode is turned on, after the knitting needle hooks the yarn B, the needle tongue is closed, the yarn B is located above the arc of the nose of the sinker, and the yarn A is below the nose of the sinker. The knitting needle moves downward, and the old coil slides toward the needle head to push the yarn A in the needle hook to the second transition surface below the nose. The inclined surface of the second transition surface has a guiding effect to make the yarn A slide along the inclined edge of the second transition surface to the inside of the needle hook and close to the needle rod. The sinker further retreats and the yarn B slides close to the needle hook. The yarn A squeezes the yarn B to make it close to the outside of the needle hook. The coil and the new coil A yarn and B yarn that are about to be formed are separated on both sides of the needle tongue, in preparation for the new coil A yarn and B yarn to pass through the old coil, the knitting needle descends and the old coil moves along the needle tongue to the top of the needle head, the A yarn and B yarn begin to bend gradually and continue until they are strung into a loop, the extension lines at both ends of the unit coil contact the fixed plate, the shape of the needle hook is consistent with the angle of the limiting inclined surface, the A yarn is on the inside of the needle hook and the B yarn is on the outside of the needle hook, so that the two yarns exchange positions, the A yarn is above the B yarn, and due to the height difference formed by the inclined contact, the yarn length of the A yarn is greater than the length of the B yarn;

[0017] When the non-exchange adding yarn mode is turned on, yarn A is below the needle hook and above the needle tongue, which is also the position of the fixed plate. Yarn B is hooked by the knitting needle and is close to the needle bar of the knitting needle. Before the loop is removed, since the position of the needle bar close to the needle hook has been occupied by yarn B, yarn A forms a certain horizontal and vertical angle close to the needle tongue when the needle tongue of the knitting needle is closed, and the old coil and the new coil B yarn and yarn A that are about to be formed are separated on both sides of the needle tongue, preparing for the new coil B yarn and yarn A to pass through the old coil. The knitting needle descends and the old coil moves along the needle tongue to the top of the needle head. Yarn B and yarn A begin to bend gradually and continue until they are strung into a loop. Yarn B and yarn A bend together and contact the bottom of the fixed plate. The shape of the needle hook matches the angle of the limiting inclined surface of the fixed plate. Yarn B is above yarn A. Due to the height difference formed by the inclined contact, the yarn is further bent into a loop, so that the yarn length of yarn B is greater than the line length of yarn A.

[0018] By adopting the foregoing design scheme, the beneficial effects of the present invention are as follows: the extended yarn that has been looped by the previous knitting needle is flipped, and the adjacent linked coils of the next knitting needle that is about to form a loop present a cross. Conversely, the extended yarn is parallel. Next, the needle loop arc of the loop stem is fixed in the included angle formed when the limiting inclined surface of the front fixing piece and the yarn bending and looping in the shape of the needle hook of the knitting needle to fix the front and back order positions of the yarn. The loop columns are then arranged in the order of the needle loop arcs, so that the loop columns cover the previous loop arc. The covering property of the unit loops on the front side of the fabric is clearly shown; the present invention can accurately control the state of the unit loops, and can realize stable and controllable covering property of the unit loops during the exchange of feeding yarn actions. The yarn has a wide adaptability, including short fiber yarns with twist or continuous filaments with networks, and can be smoothly knitted. The knitting unit loops at the junction of the yarn exchange are neat and delicate, covering each other, comparable to fabrics with digital printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a weft knitted loop;

[0020] Figure 2 It is a schematic structural diagram of the present invention;

[0021] Figures 3 to 6 It is a schematic diagram of the positions of Yarn A and Yarn B in the needle hook when the sinker and the knitting needle are intertwined in the present invention;

[0022] In the figure: fixing piece 1, limiting inclined surface 11, fixing piece inclined surface 12, knitting needle 2, needle bar 21, needle hook 22, needle tongue 23, sinker 3, blade body 31, nose 32, upper surface of nose 321, lower surface of nose 322, first transition surface 323, second transition surface 324, step 325, throat 33, sinker inclined surface 34, jacquard piece 4, needle cylinder 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, in conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description, claims and the above-mentioned drawings of the present invention, terms such as "first", "second", "third", etc. are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0025] Referring to Figures 1 to 6 :

[0026] For the convenience of description, the side closer to the center of the cylinder 5 is defined as the inner side, and the opposite side is defined as the outer side. In the figure, the marked yarn A is marked A, and the yarn B is marked B.

[0027] A double-color single-sided jacquard circular weft knitting machine equipped with a control unit coil includes a cylinder 5, a fixing piece 1 embedded in the mouth of the cylinder 5, knitting needles 2 connected to the fixing piece 1 orthogonally, and sinkers 3 connected to the knitting needles 2 orthogonally. The sinkers 3 are arranged on the outer side of the fixing piece 1. Preferably, the knitting needles 2 move up and down along the axis of the cylinder 5, and the sinkers 3 are driven by the jacquard blades 4 and move in a direction close to or away from the fixing piece 1. The jacquard blades 4 can perform programmed selector actions to advance and hold the sinkers 3. It should be noted that there are several fixing pieces 1, knitting needles 2 and sinkers 3 in this application. In this embodiment, only one group of fixing pieces 1, the mutually moving knitting needles 2 and sinkers 3 are used to elaborate on this embodiment in detail.

[0028] It should be noted that the weft knitting coil structure in this embodiment consists of a loop body (II-H-II) and an extension line (I-H-I). Among them, the straight segment (II) of the loop body becomes the loop column, and the arc segment (H) becomes the needle loop arc. The extension line (I-H-I) is also called the sinker loop, which links two adjacent unit coils. Among them, Figure 1 The arrows in indicate the curling phenomenon in the 3D coil form, such as the upper and lower edges curling towards the front and the left and right edges curling towards the back.

[0029] The knitting needle 2 includes a needle bar 21, a needle hook 22, and a needle tongue 23 that can open and close relative to the needle hook 22. The sinker 3 includes a sinker body 31 and a sinker nose 32 connected to the sinker body 31. The sinker nose 32 extends inward and has a cooperative relationship with the fixing piece 1. It should be noted that the sinker 3 in this embodiment is a one-piece sinker 3, which is integrally formed.

[0030] The nose piece 32 includes an upper surface 321 of the nose piece, a lower surface 322 of the nose piece, and a first transition surface 323 and a second transition surface 324 that connect and are joined between the upper surface 321 and the lower surface 322 of the nose piece. The first transition surface 323 is joined to the upper surface 321 of the nose piece, and the second transition surface 324 is joined to the lower surface 322 of the nose piece. Both the upper surface 321 and the lower surface 322 of the nose piece are inclined surfaces that slope upward in the direction from the inside to the outside, facilitating the guiding of the A yarn to slide from the nose piece 32 to the knitting needle 2. Its main function is to assist in loop doffing for subsequent loop holding; the first transition surface 323 is arc-shaped, and the second transition surface 324 is an inclined surface that slopes downward in the direction from the inside to the outside. The inclined surface of the second transition surface 324 has a guiding effect. When the knitting needle 2 moves along the triangular track to hook the B yarn during knitting, the knitting needle 2 descends and the needle tongue 23 flips upward under the action of the old loop and is in a semi-closed state. The B yarn is on the upper surface 321 of the nose piece; further, the knitting needle 2 moves downward and the old loop slides toward the needle hook 22, pushing the A yarn in the needle hook 22 toward the lower surface 322 of the nose piece, and through the second transition surface 324, the A yarn slides along the second transition surface 324 to the inside of the needle hook 22 and is close to the needle bar 21 (as Figure 3 ). At this time, when the sinker 3 further retracts, due to the feeding traverse angle, the B yarn will slide and be clamped near the needle hook 22. Through the first transition surface 323, the A yarn is slid and driven to the upper surface 321 of the nose piece, and the A yarn squeezes the B yarn to make it close to the outside of the needle hook 22 (as Figure 4 ).

[0031] Furthermore, a step 325 is provided between the nose piece 32 and the piece body 31. When the sinker 3 retracts to the end, when the nose piece 32 moves inward to above the fixed piece 1, a throat 33 is formed between the lower surface 322 of the nose piece, the step 325, and the upper surface of the fixed piece 1. The upper surface of the fixed piece 1 has a limiting inclined surface 11 with an inclination angle opposite to that of the second transition surface 324. The limiting inclined surface 11 and the second transition surface 324 can better fix the A yarn in front and the B yarn behind in sequence. The second transition surface 324 will not affect the loop formation sequence positions of the A yarn and the B yarn due to the jitter generated during the movement of the traditional sinker 3. The limiting inclined surface 11 can more precisely fit the angle when the needle hook 22 of the knitting needle 2 bends the yarn to form a loop to fix the front and back sequence positions of the A yarn and the B yarn, and there is no space for the two yarns to slide or roll misaligned with each other (as Figure 5 ).

[0032] Further, in order to avoid fixing the front and back order positions of the A yarn and the B yarn at the slice throat 33, the spacing of the slice throat 33 is greater than the diameter of the A yarn or the B yarn and less than the sum of the diameters of the A yarn and the B yarn, so as to avoid the yarns in the non-flipped positions. A sinker inclined surface 34 and a fixed blade inclined surface 12 are also provided at the relative positions between the sinker 3 and the fixed blade 1. Both the sinker inclined surface 34 and the fixed blade inclined surface 12 are inclined surfaces that slope downward from the inside to the outside, and the sinker inclined surface 34 and the fixed blade inclined surface 12 are arranged parallel to each other. When the sinker 3 does not interact with the fixed blade 1, the height of the sinker inclined surface 34 is lower than the height of the fixed blade inclined surface 12. When the sinker 3 advances and interacts with the knitting needle 2, the sinker inclined surface 34 will slide up along the guide of the fixed blade inclined surface 12. At this time, the end of the sinker 3 close to the fixed blade 1 is lifted upward by a height h (as Figure 6 ).

[0033] When the knitting needle 2 forms a loop, due to the height difference of the position of the limiting inclined surface 11 relative to the contact surface when the needle hook 22 of the knitting needle 2 forms a loop, the length of the unit loop changes. The A yarn close to the needle bar 21 of the knitting needle 2 and the B yarn close to the needle hook 22 of the knitting needle 2 form a complete loop knitting system. Through the pattern requirements, the actions are always the front and back flipping knitting of the A yarn and the B yarn. According to the knitting principle of the known plating process, the loop length of the plating yarn is greater than the loop length of the ground yarn, and the horizontal and vertical angles of the yarn laying can better cover and are not easy to show the ground. The above technical route fully conforms to the basic properties of the plating knitting process and can better adapt to the knitting of various yarns on the machine.

[0034] In this embodiment, by utilizing the height difference between the inclined surface 34 of the sinker and the inclined surface 12 of the fixed piece, the end of the sinker 3 close to the fixed piece 1 is lifted upward by a height h, and the position of the lower surface 322 of the sinker nose can be lowered to the spacing through which the yarn diameter of the unit coil sinker arc of the limiting inclined surface 11 passes (i.e., the spacing of the sinker throat 33). When the knitting needle 2 forms a loop, due to the propulsion and blocking of the sinker nose 32 and during loop doffing, the yarn below the second transition surface 324 is guided to be close to the needle bar 21, so that the position state of the yarn is completely and precisely controlled. And there is only one fixed piece 1 between the position of the knitting needle 2 and the adjacent formed knitting needle 2. For example, the extended yarn of the previously formed loop of the previous knitting needle 2 and the adjacent linked loop of the next knitting needle 2 about to form a loop present an intersection. Conversely, the extended yarn is parallel. Next, the needle loop arc of the loop stem is fixed in the order of the yarn front and back when the included angle between the limiting inclined surface 11 of the front fixed piece 1 and the shape of the needle hook 22 of the knitting needle 2 bends the yarn to form a loop. The loop columns are then arranged in the order of the needle loop arcs, so that the loop columns cover the previous loop arc. The covering property of the unit loops on the front of the fabric is clearly shown. This embodiment conforms to the knitting principle of the well-known plating process. The length of the plating loop is greater than the length of the ground yarn, and the horizontal and vertical angles of yarn laying can cover better. The exchanged plating jacquard knitting yarns are mostly the same. Through several years of testing the parameters of the fabric, such as the properties of the yarn itself (linear density, stiffness, friction coefficient), the coordinated requirements of the loop length and the coefficient of underfill, and developing corresponding devices, a high-quality two-color plating jacquard fabric is woven. It is worth noting that for the knitted fabric with a small spacing of the sinker throat 33, the extended yarn is short. The loop columns of the face yarn are exposed on the front, and the loop arcs of the ground yarn are exposed on the back. The fabric surface has good tightness, is relatively flat and stiff. For the knitted fabric with a large spacing of the sinker throat 33, the extended yarn is long. The fabric surface is relatively clear and has better elasticity.

[0035] The sinker throat 33 that holds the loop between the sinker 3 and the second inclined surface, when the knitting needle 2 rises, the sinker 3 advances towards the center of the needle cylinder 5. The sinker 3 provided with the second transition surface 324 is advanced here, so that the distance between the sinker 3 and the limiting inclined surface 11 changes, which can better hold the loop and will no longer damage or affect the order of the yarn feeding process during propulsion, to meet the basic requirements of knitting; a further advantage is that since the sinker throat 33 is combined, the distance of the sinker throat 33 can be changed by replacing the sinker 3 or the limiting inclined surface 11 with different sizes, so as to knit fabrics with different styles.

[0036] When in use, when the A yarn and the B yarn are fed into the yarn guide and bent into a loop, the sinker 3 can be retracted and maintained according to the weaving process. The jacquard piece 4 controls the sinker 3 through a program to weave a two-color pattern of precise unit coils, and multiple combinations can be made according to the pattern design requirements. In addition, the action of the lower drum jacquard needle selector can be combined with the unit coil knitting needle 2 at the junction of the pattern conversion to cooperate with the change of the needle pressing depth. The dynamic change of the line length of the knitting needle 2 at the junction of the pattern conversion is conducive to the stability of the front-to-back position relationship between the A yarn and the B yarn. The knitting needle 2 corresponding to the exchange position and the controlled unit coil on the left and right of the sinker 3 control the length of the sinker arc intersection to be shorter. The beneficial effect is to play a connecting role for the next looped unit coil, not only fix the front-to-back position of the last unit coil before the previous pattern converter, but also position the unit coil at the first junction, and pave the way for the position relationship between the A yarn and the B yarn to ensure the position of the added yarn is accurate and stable, and prevent the defect of only covering half of the coil or incomplete coverage. Compared with the conventional added yarn coil length, it is preferably slightly shorter and flexibly adjustable, and can adapt to different yarns for subdivision adjustment. Of course, the length of the conventional added yarn coil can also be lengthened, which is opposite to the above, so as to present another cross color uniform mixing and natural transition effect at the border of the pattern conversion.

[0037] Specifically realize the two actions of exchanging yarn:

[0038] 1. When the sinker 3 is pushed forward after the jacquard piece 4 moves and retreats along the track, the knitting needle 2 hooks the yarn B and the needle tongue 23 is closed. The yarn B is located above the arc of the nose 32 of the sinker 3, and the yarn A is below the nose 32 of the sinker 3. The knitting needle 2 further moves downward and the old coil slides toward the needle head to push the yarn A in the needle hook 22 to the second transition surface 324 below the nose 32. The inclined surface of the second transition surface 324 has a guiding effect to make the yarn A slide along the inclined edge of the second transition surface 324 to the inner side of the needle hook 22 and close to the needle bar 21. At this time, the sinker 3 retreats further and the yarn B slides near the needle hook 22. The yarn A squeezes the yarn B to make it close to the outside of the needle hook 22. The old coil and the new coil A and B yarns to be formed are separated on both sides of the needle tongue 23, preparing for the new coil A and B yarns to pass through the old coil. When the knitting needle 2 descends, the old coil moves outward along the needle tongue 23 to the top of the needle head. The A yarn and the B yarn begin to bend gradually and continue until they are strung into a loop. The extension lines at both ends of the unit coil are in contact with the fixed plate 1. The shape of the needle hook 22 is consistent with the angle of the limiting inclined surface 11 of the fixed plate 1. The A yarn is on the inside of the needle hook 22 and the B yarn is on the outside of the needle hook 22, thereby achieving the effect of exchanging the positions of the two yarns. The A yarn is above the B yarn, and due to the height difference formed by the inclined contact, the yarn is further bent into a loop, so that the yarn length of the A yarn is greater than the length of the B yarn.

[0039] 2. When the jacquard piece 4 is not moving, yarn B is no longer in contact with the sinker 3, and yarn A is under the needle hook 22 and above the needle tongue 23, that is, at the position of the fixed plate. Yarn B is hooked by needle 2 and close to the needle hook 22 and needle bar 21 of needle 2. Before the loop is unhooked, since the position of the needle bar 21 close to the needle hook 22 has been occupied by yarn B, yarn A forms a certain horizontal and vertical angle close to the needle tongue 23 when the needle tongue 23 of needle 2 is closed. The old coil and the new coil B yarn and yarn A to be formed are separated on both sides of the needle tongue 23, preparing for the new coil B yarn and yarn A to pass through the old coil. When the knitting needle 2 descends, the old coil moves outward along the needle tongue 23 to the top of the needle head. The yarn B and the yarn A begin to bend gradually and continue until they are strung into a loop. The yarn B and the yarn A are bent together and contact the bottom of the fixed plate 1. The shape of the needle hook 22 is in line with the angle of the limiting inclined surface 11 of the fixed plate 1. The yarn B is above the yarn A, and due to the height difference formed by the inclined contact, the yarn is further bent into a loop, so that the yarn length of the yarn B is greater than the line length of the yarn A.

[0040] By adopting the above-mentioned design scheme, the beneficial effects of the present invention are as follows: when the weaving process sinker 3 is controlled by the jacquard piece 4 to perform program editing retraction and holding action, the length of the unit coil of the B yarn covering the A yarn is longer than the A yarn when the position B yarn is maintained, and the length of the unit coil of the A yarn covering the B yarn is longer than the B yarn when advancing and retracting to the corresponding position. The loop yarn length of the two methods is consistent, and the added yarn is always longer than the bottom yarn. The fabric has good flatness, and the texture and physical properties of the two-color mutual covering are comparable. Based on the added yarn process organization, the fabric does not have the dotted line problem of the traditional single-sided two-color jacquard, and the wearing performance is significantly improved. By changing the triangle and the arrangement of the knitting needles to further enrich the composite organization and the knitting process, the fabric texture and the pattern can be organically combined.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-color single-sided jacquard circular knitting machine with a control unit coil, characterized in that: It includes a fixing plate embedded in the nozzle of the needle cylinder, a knitting needle that moves up and down in a manner orthogonal to the fixing plate, and a sinker that moves horizontally forward and backward in a manner orthogonal to the knitting needle, the sinker moves in a direction close to or away from the fixing plate, and the knitting needle includes a needle rod, a needle hook, and a needle tongue that can be opened and closed relative to the needle hook; The sinker includes a sheet body and a sheet nose connected to the sheet body, the sheet nose extends in a direction away from the sheet body, the sinker and the fixing sheet are connected to each other in a cooperative manner, and the sheet nose includes a sheet nose upper surface, a sheet nose lower surface, and a sheet nose transition surface connecting the sheet nose upper surface and the sheet nose lower surface; The nose transition surface includes a first transition surface and a second transition surface connected to each other, the first transition surface is connected to the upper surface of the nose, the second transition surface is connected to the lower surface of the nose, and the upper surface of the nose and the lower surface of the nose are both inclined surfaces inclined upward from the inside to the outside; The first transition surface is in an arc shape, and the second transition surface is an inclined surface that slopes downward from the inside to the outside; A step is provided between the sheet nose and the sheet body, and a sheet throat is formed between the lower surface of the sheet nose, the step and the upper surface of the fixing sheet; The distance between the throats is greater than the diameter of one yarn and less than the sum of the diameters of the two yarns; The upper surface of the fixing plate has a limiting inclined surface with an inclination angle opposite to that of the second transition surface; A sinker inclined surface and a fixed plate inclined surface are also provided at relative positions between the sinker and the fixed plate, and both the sinker inclined surface and the fixed plate inclined surface are inclined surfaces inclined downward from the inside to the outside, and the sinker inclined surface and the fixed plate inclined surface are arranged parallel to each other; when the sinker does not interact with the fixed plate, the height of the sinker inclined surface is lower than the height of the fixed plate inclined surface.

2. The control method of the two-color single-sided jacquard circular knitting machine with a control unit coil according to claim 1 is characterized in that: It includes an exchange and add yarn mode and a non-exchange and add yarn mode. When the sinker is pushed back along the track and interacts with the fixed plate, the exchange and add yarn mode is started; when the sinker is pushed back along the track and the exchange and add yarn mode is started; when the sinker is not pushed back along the track and does not interact with the fixed plate, the non-exchange and add yarn mode is started; When the exchange and adding yarn mode is turned on, after the knitting needle hooks the yarn B, the needle tongue is closed, the yarn B is located above the arc of the nose of the sinker, and the yarn A is below the nose of the sinker. The knitting needle moves downward, and the old coil slides toward the needle head to push the yarn A in the needle hook to the second transition surface below the nose. The inclined surface of the second transition surface has a guiding effect to make the yarn A slide along the inclined edge of the second transition surface to the inside of the needle hook and close to the needle rod. The sinker further retreats and the yarn B slides close to the needle hook. The yarn A squeezes the yarn B to make it close to the outside of the needle hook. The coil and the new coil A yarn and B yarn that are about to be formed are separated on both sides of the needle tongue, in preparation for the new coil A yarn and B yarn to pass through the old coil, the knitting needle descends and the old coil moves along the needle tongue to the top of the needle head, the A yarn and B yarn begin to bend gradually and continue until they are strung into a loop, the extension lines at both ends of the unit coil contact the fixed plate, the shape of the needle hook is consistent with the angle of the limiting inclined surface, the A yarn is on the inside of the needle hook and the B yarn is on the outside of the needle hook, so that the two yarns exchange positions, the A yarn is above the B yarn, and due to the height difference formed by the inclined contact, the yarn length of the A yarn is greater than the length of the B yarn; When the non-exchange adding yarn mode is turned on, yarn A is below the needle hook and above the needle tongue, which is also the position of the fixed plate. Yarn B is hooked by the knitting needle and is close to the needle bar of the knitting needle. Before the loop is removed, since the position of the needle bar close to the needle hook has been occupied by yarn B, yarn A forms a certain horizontal and vertical angle close to the needle tongue when the needle tongue of the knitting needle is closed, and the old coil and the new coil B yarn and yarn A that are about to be formed are separated on both sides of the needle tongue, preparing for the new coil B yarn and yarn A to pass through the old coil. The knitting needle descends and the old coil moves along the needle tongue to the top of the needle head. Yarn B and yarn A begin to bend gradually and continue until they are strung into a loop. Yarn B and yarn A bend together and contact the bottom of the fixed plate. The shape of the needle hook matches the angle of the limiting inclined surface of the fixed plate. Yarn B is above yarn A. Due to the height difference formed by the inclined contact, the yarn is further bent into a loop, so that the yarn length of yarn B is greater than the line length of yarn A.

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