A cam-type shedding machine, a rapier loom, and a shedding control method.

Abstract

This invention discloses a cam-driven shedding machine, a rapier loom, and a shedding control method. The cam-driven shedding machine drives a heald frame to reciprocate vertically. The heald frame is configured to move between a highest and lowest point vertically. It includes a camshaft, a first cam plate, a second cam plate, and a swing arm. Both the first and second cam plates are fixed to the camshaft to rotate with it. The first and second cam plates cooperate with the corresponding swing arm to output oscillations, driving the heald frame to move vertically. The second cam plate drives the corresponding swing arm to oscillate, driving the corresponding heald frame to move vertically. When N first cam plates drive at least one heald frame to its highest point, and at least one heald frame is at its lowest point, the second cam plate drives the corresponding heald frame to its lowest point. When N first cam plates drive the corresponding heald frame to its heald flat position, the second cam plate drives the corresponding heald frame to its highest point. This structure effectively improves weaving efficiency.

Description

Technical Field

[0001] This invention relates to the field of loom technology, and in particular to a cam shedding machine, a rapier loom, and a shedding control method. Background Technology

[0002] Rapier looms are the mainstream looms, known for their high speed, stability, and adaptability to various fabric types. They are the preferred machine for weaving various grades of garment fabrics and other types of grey fabrics. Rapier looms primarily utilize a cam shedding mechanism, which, through a linkage assembly, drives the heald frames up and down, separating the warp yarns into upper and lower layers, creating an opening to facilitate the passage of the rapier heads.

[0003] When weaving multiple narrow medical bandages simultaneously, the warp and selvage yarns are usually wound on the same warp beam for easy handling. However, since the amount of warp and selvage yarns used is different (more selvage yarn and less warp yarn), while the release amount is the same, the tension of the warp and selvage yarns is different (lower tension in the warp yarn and higher tension in the selvage yarn). This can easily lead to the selvage yarn breaking, which greatly affects weaving efficiency.

[0004] Therefore, how to effectively improve weaving efficiency is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a cam shedding machine that can effectively improve weaving efficiency.

[0006] Another object of the present invention is to provide a rapier loom.

[0007] Another object of the present invention is to provide an opening control method.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A cam-driven opening machine is used to drive a heald frame to reciprocate in a vertical direction. The heald frame is configured to move between a highest point and a lowest point in a vertical direction. It includes a camshaft, a first cam plate, a second cam plate, and a rocker arm. The first cam plate and the second cam plate are both fixed on the camshaft to follow the rotation of the camshaft.

[0010] The first cam plate and the second cam plate cooperate with the corresponding swing arm to output swing and drive the heald frame to move in the vertical direction; the number of the first cam plates is N, N≥2; the N first cam plates drive the corresponding swing arm to swing, thereby driving the corresponding heald frame to move, and at a preset position, at least one heald frame is at the highest point and at least one heald frame is at the lowest point;

[0011] The second cam plate drives the corresponding swing arm to swing, thereby causing the corresponding heald frame to move vertically, and satisfying the following conditions:

[0012] When at least one of the heald frames corresponding to the first cam plate N is at its highest point and at least one of the heald frames is at its lowest point, the heald frame corresponding to the second cam plate N is at its lowest point.

[0013] When the heald frame corresponding to the first cam plate is in the heald flat position, the heald frame corresponding to the second cam plate is at its highest point.

[0014] Optionally, the maximum cam radius of the first cam is greater than the maximum cam radius of the second cam.

[0015] Optionally, the number of times that a single first cam plate rotates once to drive the corresponding heddle frame to move up and down is A.

[0016] The second cam rotates once, driving the corresponding heald frame to move up and down a number of times, B times, where B = nA, n ≥ 1.

[0017] Optionally, it also includes a guide wheel and a swing arm corresponding to the guide wheel, the guide wheel being fixed to the camshaft and disposed between the first cam plate and the second cam plate.

[0018] Optionally, it may also include a drive mechanism connected to the camshaft, the drive mechanism being capable of driving the camshaft to rotate.

[0019] Optionally, the drive mechanism includes a drive motor and a transmission assembly. The drive motor is connected to the camshaft through the transmission assembly, and the drive motor can transmit power to the camshaft through the transmission assembly.

[0020] Optionally, the transmission assembly includes an input shaft, a first bevel gear, a second bevel gear, and a transmission shaft. The first bevel gear is disposed on the input shaft, the second bevel gear is disposed on the transmission shaft, the first bevel gear meshes with the second bevel gear, and the transmission shaft is connected to the camshaft.

[0021] A rapier loom, characterized in that it includes a cam shedding machine as described in any one of the above claims, and further includes a connecting rod assembly and a heald frame, wherein the cam shedding machine is connected to the heald frame via the connecting rod assembly.

[0022] Optionally, the linkage assembly includes a blade linkage connector, a tie rod, a rocker arm assembly, and a lifting rod assembly;

[0023] One end of the blade connecting rod assembly is connected to the swing arm, and the other end is connected to one end of the inclined tie rod. One end of the rocker arm assembly is connected to the other end of the inclined tie rod, and the other end is connected to one end of the lifting rod assembly. The other end of the lifting rod assembly is connected to the heald frame.

[0024] Optionally, the rocker arm assembly includes a rotating shaft and a blade, the blade being rotatably mounted on the rotating shaft;

[0025] There are at least two rocker arm assemblies and at least one lifting rod assembly. At least one rocker arm assembly and one lifting rod assembly are located on one side of the heald frame, and at least one rocker arm assembly and one lifting rod assembly are located on the opposite side of the heald frame. The rocker arm assemblies are connected to each other by a long connecting rod.

[0026] An opening control method, comprising:

[0027] Adjust the positions of the first and second cam plates on the camshaft;

[0028] The camshaft is driven to rotate, which in turn drives the first cam plate and the second cam plate to rotate. The first cam plate and the second cam plate cooperate with the corresponding rocker arm to output oscillation and drive the heald frame to move in the vertical direction.

[0029] The number of the first cam plates is N, where N≥2; the N first cam plates drive the corresponding swing arm to swing, thereby moving the corresponding heald frame, and at least one heald frame is at the highest point and at least one heald frame is at the lowest point at a preset position;

[0030] The second cam plate drives the corresponding swing arm to swing, thereby causing the corresponding heald frame to move vertically, and satisfying the following conditions:

[0031] When at least one of the heald frames corresponding to the first cam plate N is at its highest point and at least one of the heald frames is at its lowest point, the heald frame corresponding to the second cam plate N is at its lowest point.

[0032] When the heald frame corresponding to the first cam plate is in the heald flat position, the heald frame corresponding to the second cam plate is at its highest point.

[0033] As can be seen from the above technical solution, when the rapier loom is working, the camshaft rotates, and the camshaft drives the first cam plate and the second cam plate to rotate circumferentially. During the rotation of the first cam plate and the second cam plate, they continuously push the swing arm that is set to them respectively. Specifically, when the N first cam plates drive at least one heald frame corresponding to them to the highest point and at least one heald frame to the lowest point, the second cam plate drives the corresponding heald frame to the lowest point. At this time, the second cam plate does not lift the yarn when driving the corresponding heald frame, and the tension of the warp yarn is kept within the preset tension range. When the N first cam plates drive the corresponding heald frame to the heald flat position, the second cam plate drives the corresponding heald frame to the highest point. At this time, the second cam plate lifts the yarn when driving the corresponding heald frame, realizing warp feeding, thereby leaving a margin for the selvage yarn, reducing the probability of selvage yarn breakage, and thus effectively improving weaving efficiency. Attached Figure Description

[0034] 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 are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the cam opening machine disclosed in the embodiments of the present invention;

[0036] Figure 2 This is a schematic diagram of the connection structure between the cam opening machine and the heald frame disclosed in the embodiments of the present invention;

[0037] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0038] Figure 4 This is a schematic diagram of the structure of the first cam plate disclosed in the embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the second cam plate disclosed in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the guide wheel structure disclosed in the embodiments of the present invention;

[0041] Figure 7 This is a schematic diagram of the internal structure of the cam opening machine (with guide wheel removed) disclosed in the embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the arrangement structure of the first cam plate and the second cam plate disclosed in the embodiments of the present invention;

[0043] Figure 9 for Figure 8 The left view;

[0044] Figure 10 for Figure 8 The right view;

[0045] Figure 11 This is a schematic diagram of the internal structure of the cam opening machine disclosed in the embodiments of the present invention;

[0046] Figure 12 This is a schematic diagram of the arrangement structure of the first cam plate, the second cam plate, and the guide wheel disclosed in the embodiments of the present invention;

[0047] Figure 13 for Figure 12 The left view;

[0048] Figure 14 for Figure 12 The right view;

[0049] Figure 15 This is a schematic diagram of the structure of the heald frame driven by the second cam plate in an embodiment of the present invention at its lowest point;

[0050] Figure 16 This is a schematic diagram of the structure in which the heald frame driven by the second cam plate disclosed in the embodiment of the present invention is at its highest point.

[0051] Figure label:

[0052] 100. Drive mechanism; 101. Input shaft; 102. First bevel gear; 103. Second bevel gear; 104. Transmission shaft; 200. Camshaft; 300. First cam plate; 400. Second cam plate; 500. Rocker arm; 600. Guide wheel; 700. Linkage assembly; 701. Linkage coupling; 702. Diagonal tie rod; 703. Rocker arm assembly; 704. Lifting rod assembly; 7041. Threaded part of lifting rod; 7042. Nut; 7043. Stud; 800. Heald frame; 900. Fabric roll; 1000. Take-up shaft; 1100. Rear beam guide; 1200. Warp beam; 1300. Warp yarn; 1301. Shelf. Detailed Implementation

[0053] In view of this, the core of the present invention is to provide a cam shedding machine that can effectively improve weaving efficiency.

[0054] Another core aspect of this invention is to provide a rapier loom.

[0055] Another core aspect of this invention lies in providing an opening control method.

[0056] 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 them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Please refer to [the accompanying drawings]. Figures 1 to 16 .

[0057] Please refer to Figures 1-5 , Figures 7-10 The cam opening machine disclosed in this embodiment of the invention is used to drive the heald frame 800 to reciprocate in the vertical direction. The heald frame 800 is configured to move between the highest point and the lowest point in the vertical direction. The cam opening machine includes a camshaft 200, a first cam plate 300, a second cam plate 400 and a rocker arm 500. The first cam plate 300 and the second cam plate 400 are both fixed on the camshaft 200 so as to rotate with the camshaft 200.

[0058] The first cam plate 300 and the second cam plate 400 cooperate with the corresponding rocker arm 500 to output oscillation and drive the heald frame 800 to move vertically. The number of first cam plates 300 is N, where N≥2. The N first cam plates 300 drive the corresponding rocker arm 500 to oscillate, thereby driving the corresponding heald frame 800 to move, and at least one heald frame 800 is at the highest point and at least one heald frame 800 is at the lowest point in a preset position. The second cam plate 400 drives the corresponding rocker arm 500 to oscillate, thereby driving the corresponding heald frame 800 to move vertically, and satisfies the following conditions: when the N first cam plates 300 drive the corresponding at least one heald frame 800 to the highest point and at least one heald frame 800 to the lowest point, the second cam plate 400 drives the corresponding heald frame 800 to the lowest point; when the N first cam plates 300 drive the corresponding heald frame 800 to the heald flat position, the second cam plate 400 drives the corresponding heald frame 800 to the highest point.

[0059] When the rapier loom is working, the camshaft 200 rotates, driving the first cam plate 300 and the second cam plate 400 to rotate circumferentially. During the rotation of the first cam plate 300 and the second cam plate 400, they continuously push the corresponding swing arms 500 to move. When the N first cam plates 300 drive at least one heald frame 800 to the highest point and at least one heald frame 800 to the lowest point, the second cam plate 400 drives the corresponding heald frame 800 to the lowest point. At this time, the second cam plate 400 does not lift the yarn, and the tension of the warp yarn 1300 remains within the preset tension range. When the N first cam plates 300 drive the corresponding heald frame 800 to the heald flat position, the second cam plate 400 drives the corresponding heald frame 800 to the highest point. At this time, the second cam plate 400 lifts the yarn, realizing warp feeding, thereby leaving a margin for the selvage yarn, reducing the probability of selvage yarn breakage, and effectively improving weaving efficiency.

[0060] It should be noted that the fabric roll 900, take-up beam 1000, back beam guide 1100 and warp beam 1200 are all part of the rapier loom. When the rapier loom is working, the warp yarn 1300 passes through the fabric roll 900, take-up beam 1000 and back beam guide 1100 in sequence and winds onto the warp beam 1200.

[0061] Please refer to the details. Figure 15 When the N first cam plates 300 drive at least one heald frame 800 corresponding to them to the highest point and at least one heald frame 800 to the lowest point, the second cam plate 400 drives the corresponding heald frame 800 to the lowest point. At this time, the second cam plate 400 drives the corresponding heald frame 800 to not lift the yarn, and the tension of the warp yarn 1300 remains within the preset tension range.

[0062] Please refer to the details. Figure 16 When the first cam 300 drives the corresponding heald frame 800 to the heald flat position, the second cam 400 drives the corresponding heald frame 800 to the highest point. At this time, the second cam 400 drives the heald frame 800 to lift the yarn, realizing warp feeding. At this time, a portion of the warp yarn 1300 is released from the warp beam 1200, thereby leaving a margin for the edge yarn and reducing the probability of edge yarn breakage.

[0063] It needs to be explained that in two adjacent heald frames 800, one heald frame 800 is at its highest point and the other heald frame 800 is at its lowest point. At this time, the yarn is divided into upper and lower layers, forming the shed 1301. In each opening movement of the cam sheathing machine, all warp yarns 1300 start from the heald flat position and separate in the upper and lower directions to form the required shed 1301. When the shed closes, all upper and lower layers of warp yarns 1300 must return to the heald flat position. The shed 1301 is also called warp opening or opening.

[0064] As a further embodiment, the maximum cam diameter of the first cam plate 300 disclosed in this embodiment of the invention is greater than the maximum cam diameter of the second cam plate 400. This configuration effectively controls the warp tension and prevents excessive adjustment of the warp tension.

[0065] As a further embodiment, in the cam opening machine disclosed in this embodiment of the invention, the number of times a first cam plate 300 rotates once to drive the corresponding heald frame 800 to move up and down is A, and the number of times a second cam plate 400 rotates once to drive the corresponding heald frame 800 to move up and down is B, where B = nA and n ≥ 1.

[0066] With this configuration, the second cam plate 400 drives the corresponding heald frame 800 at a higher frequency than the first cam plate 300 drives the corresponding heald frame 800, thereby causing the yarn to shake and separate, avoiding sticking.

[0067] Please refer to Figure 6 , Figures 11 to 14 In order to guide the second cam plate 400, the cam opening machine disclosed in the embodiments of the present invention further includes a guide wheel 600 and a swing arm 500 corresponding to the guide wheel 600. The guide wheel 600 is fixed on the camshaft 200 and is disposed between the first cam plate 300 and the second cam plate 400.

[0068] The present invention does not limit the specific structure of the guide wheel 600. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0069] As one embodiment, the guide wheel 600 disclosed in this embodiment of the invention can be a ring-shaped cam. When the camshaft 200 drives the guide wheel 600 to rotate, the guide wheel 600 is always in contact with its corresponding swing arm 500. Therefore, the heald frame 800 is always in a stationary state.

[0070] The embodiments of the present invention do not limit the specific structure of the drive mechanism 100. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0071] As one embodiment, the drive mechanism 100 disclosed in this embodiment of the invention includes a drive motor and a transmission assembly, wherein the drive motor is connected to the camshaft 200 through the transmission assembly, and the drive motor can transmit power to the camshaft 200 through the transmission assembly.

[0072] The embodiments of the present invention do not limit the specific structure of the transmission component. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0073] As one embodiment, the transmission component disclosed in this embodiment of the invention includes an input shaft 101, a first bevel gear 102, a second bevel gear 103, and a transmission shaft 104. The first bevel gear 102 is disposed on the input shaft 101, the second bevel gear 103 is disposed on the transmission shaft 104, the first bevel gear 102 and the second bevel gear 103 mesh with each other, and the transmission shaft 104 is connected to the camshaft 200.

[0074] When the motor is started, the motor drives the input shaft 101 to rotate. The input shaft 101 drives the first bevel gear 102 to rotate, the first bevel gear 102 drives the second bevel gear 103 to rotate, the second bevel gear 103 drives the transmission shaft 104 to rotate, the transmission shaft 104 drives the camshaft 200 to rotate, and the camshaft 200 drives the first cam plate 300, the second cam plate 400 and the guide wheel 600 to rotate.

[0075] This invention also discloses a rapier loom, including a cam shedding machine as disclosed in any of the above embodiments, and further including a connecting rod assembly 700 and a heald frame 800, wherein the cam shedding machine is connected to the heald frame 800 through the connecting rod assembly 700.

[0076] Since this rapier loom uses the cam shedding machine disclosed in the embodiments of the present invention, it also has the technical advantages of the cam shedding machine disclosed in the embodiments of the present invention, which will not be described in detail in the embodiments of the present invention.

[0077] The specific structure of the connecting rod assembly 700 is not limited in the embodiments of the present invention. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0078] As one embodiment, please refer to Figures 1 to 3 The linkage assembly 700 disclosed in this embodiment of the invention includes a blade linkage connector 701, a tie rod 702, a rocker arm assembly 703, and a lifting rod assembly 704.

[0079] Among them, one end of the blade connecting rod assembly 701 is connected to the swing arm 500, and the other end is connected to one end of the tie rod 702. One end of the rocker arm assembly 703 is connected to the other end of the tie rod 702, and the other end is connected to one end of the lifting rod assembly 704. The other end of the lifting rod assembly 704 is connected to the heald frame 800.

[0080] It should be noted that the lifting rod assembly 704 includes a lifting rod threaded part 7041, a nut 7042, and a stud 7043. The height of the heddle frame 800 on the lifting rod 704 is adjusted by adjusting the height of the stud 7043 on the lifting rod threaded part 7041, and then fixed by the nut 7042.

[0081] To improve the stability of the movement of the heald frame 800, the rocker arm assembly 703 disclosed in this embodiment of the invention includes a rotating shaft and a blade, with the blade rotatably mounted on the rotating shaft.

[0082] There are at least two rocker arm assemblies 703 and at least one lifting rod assembly 704. At least one rocker arm assembly 703 and one lifting rod assembly 704 are disposed on one side of the heald frame 800, and at least one rocker arm assembly 703 and one lifting rod assembly 704 are disposed on the opposite side of the heald frame 800. Different rocker arm assemblies 703 are connected by long connecting rods.

[0083] When the first cam plate 300 pushes the rocker arm 500 to move, the rocker arm 500 drives the blade connecting rod assembly 701 to move, the rocker arm 500 drives the blade connecting rod assembly 701 to move the rocker arm assembly 703, the rocker arm assembly 703 drives the lifting rod assembly 704 to move, and the lifting rod drives the heald frame 800 to move in the vertical direction.

[0084] This invention also discloses a cam opening control method, which adjusts the positions of the first cam plate 300 and the second cam plate 400 on the camshaft 200;

[0085] The camshaft 200 is driven to rotate, which in turn drives the first cam plate 300 and the second cam plate 400 to rotate. The first cam plate 300 and the second cam plate 400 cooperate with the corresponding rocker arm 500 to output oscillation and drive the heald frame 800 to move in the vertical direction.

[0086] The number of first cam plates 300 is N, where N≥2; the N first cam plates 300 drive the corresponding swing arm 500 to swing, thereby moving the corresponding heald frame 800, and at least one heald frame 800 is at the highest point and at least one heald frame 800 is at the lowest point in a preset position; the second cam plate 400 drives the corresponding swing arm 500 to swing, thereby moving the corresponding heald frame 800 in the vertical direction, and satisfies the following conditions: when the N first cam plates 300 drive the corresponding at least one heald frame 800 to be at the highest point and at least one heald frame 800 to be at the lowest point, the second cam plate 400 drives the corresponding heald frame 800 to be at the lowest point; when the N first cam plates 300 drive the corresponding heald frame 800 to be in the heald flat position, the second cam plate 400 drives the corresponding heald frame 800 to be at the highest point.

[0087] When the rapier loom is working, firstly, the positions of the first cam plate 300 and the second cam plate 400 on the camshaft 200 are adjusted, and then the camshaft 200 is driven to rotate. The camshaft 200 drives the first cam plate 300 and the second cam plate 400 to rotate circumferentially. During the rotation of the first cam plate 300 and the second cam plate 400, the corresponding swing arms 500 are continuously pushed to move. Specifically, when N first cam plates 300 drive at least one corresponding heald frame 800 to its highest point, and at least one heald frame 800 is at its lowest point, the... When the second cam plate 400 drives the corresponding heald frame 800 to the lowest point, the second cam plate 400 does not lift the yarn, and the tension of the warp yarn 1300 remains within the preset tension range. When the first cam plate 300 drives the corresponding heald frame 800 to the heald flat position, the second cam plate 400 drives the corresponding heald frame 800 to the highest point. At this time, the second cam plate 400 drives the corresponding heald frame 800 to lift the yarn, realizing warp feeding, thereby leaving a margin for the selvage yarn, reducing the probability of selvage yarn breakage, and thus effectively improving weaving efficiency.

[0088] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cam shedding machine for driving a heald frame to reciprocate in a vertical direction, the heald frame being configured to move in the vertical direction between a top point and a bottom point, characterized by, The camshaft, the first cam piece, the second cam piece and the swing arm, the first cam piece and the second cam piece are fixed on the camshaft to follow the camshaft rotation; The first cam piece, the second cam piece and the corresponding swing arm cooperate to output swing and drive the heald frame in the vertical direction; The number of the first cam piece is N pieces, N≥2; N pieces of the first cam piece drives the corresponding swing arm to swing to drive the corresponding heald frame to move, and at least one of the heald frame is at the highest point and at least one of the heald frame is at the lowest point at the preset position; The second cam piece drives the corresponding swing arm to swing to drive the corresponding heald frame to move in the vertical direction, and satisfies the following conditions: When N pieces of the first cam piece drives at least one of the heald frame to be at the highest point and at least one of the heald frame to be at the lowest point, the second cam piece drives the corresponding heald frame to be at the lowest point; When N pieces of the first cam piece drives the corresponding heald frame to be at the heald flat position, the second cam piece drives the corresponding heald frame to be at the highest point; At this time, the second cam piece drives the corresponding heald frame to lift the yarn, realizes the warp, at this time, the warp is released from the warp beam, so as to leave the margin for the twisting edge yarn, reduces the probability of the phenomenon of the twisting edge yarn breakage; The maximum cam radius of the first cam piece is greater than that of the second cam piece; The number of times of the corresponding heald frame driven by one piece of the first cam piece to rotate one circle to move up and down is A times; The number of times of the corresponding heald frame driven by the second cam piece to rotate one circle to move up and down is B times, and B=nA, n≥1.

2. The cam opener of claim 1 wherein, It also includes a guide wheel and a swing arm corresponding to the guide wheel, the guide wheel is fixed on the camshaft, and is arranged between the first cam piece and the second cam piece.

3. The cam opening machine according to claim 1, wherein It also includes a driving mechanism connected with the camshaft, and the driving mechanism can drive the camshaft to rotate.

4. The cam opening machine according to claim 3, wherein The driving mechanism includes a driving motor and a transmission assembly, the driving motor is connected with the camshaft through the transmission assembly, and the driving motor can transmit power to the camshaft through the transmission assembly.

5. The cam opening machine according to claim 4, wherein The transmission assembly includes an input shaft, a first bevel gear, a second bevel gear and a transmission shaft, the first bevel gear is arranged on the input shaft, the second bevel gear is arranged on the transmission shaft, the first bevel gear is engaged with the second bevel gear, and the transmission shaft is connected with the camshaft.

6. A rapier loom, characterized in that The cam shedding machine includes the cam shedding machine according to any one of claims 1-5, a connecting rod assembly and a heald frame, and the cam shedding machine is connected with the heald frame through the connecting rod assembly.

7. The gripper bar weaving machine according to claim 6, characterized in that The connecting rod assembly includes a blade connecting rod combination, an inclined pull rod, a rocker arm assembly and a lifting rod assembly; One end of the blade connecting rod combination is connected with the swing arm, the other end is connected with one end of the inclined pull rod, one end of the rocker arm assembly is connected with the other end of the inclined pull rod, the other end is connected with one end of the lifting rod assembly, and the other end of the lifting rod assembly is connected with the heald frame.

8. The gripper bar weaving machine according to claim 7, characterized in that The rocker assembly comprises a rotating shaft and a blade, and the blade is arranged on the rotating shaft and rotates; The rocker assembly and the pull rod assembly are at least two, at least one rocker assembly and one pull rod assembly are arranged on one side of the heald frame, at least one rocker assembly and one pull rod assembly are arranged on the opposite side of the heald frame, and the rocker assemblies are connected by long connecting rods.

9. An opening control method characterized by, Comprise: Adjust the position of the first cam plate and the second cam plate on the cam shaft; Drive the cam shaft to rotate, and the cam shaft drives the first cam plate and the second cam plate to rotate, the first cam plate and the second cam plate cooperate with the corresponding swing arms to output swing, and drive the heald frame to move in the vertical direction; The number of the first cam plates is N, and N≥2; N first cam plates drive the corresponding swing arms to swing to drive the corresponding heald frames to move, and at least one heald frame is located at the highest point and at least one heald frame is located at the lowest point at the preset position; The second cam plate drives the corresponding swing arm to swing to drive the corresponding heald frame to move in the vertical direction, and satisfies the following conditions: When the N first cam plates drive at least one heald frame to be located at the highest point and at least one heald frame to be located at the lowest point, the second cam plate drives the corresponding heald frame to be at the lowest point; When the N first cam plates drive the corresponding heald frame to be located at the heald flat position, the second cam plate drives the corresponding heald frame to be at the highest point; At this time, the second cam plate drives the corresponding heald frame to lift the yarn, realizes the warp feeding, and at this time, the warp yarn is released from the warp beam, thereby leaving a margin for the edge yarn, and reducing the probability of the occurrence of the edge yarn breakage phenomenon.

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