Moving knife and double needle sewing machine

Abstract

The present application relates to a kind of moving knife and double needle sewing machine.The moving knife is used to cooperate with needle, rotating shuttle, fixed knife and bottom thread holding spring to cut off seam, the side surface of moving knife is provided with hooking line groove along third direction to rotating shuttle, hooking line groove penetrates moving knife along first direction, the side of moving knife is provided with blocking piece along first direction away from fixed knife, blocking piece is fixed to moving knife and located at the side of hooking line groove along second direction to moving knife head, the side of blocking piece along second direction away from moving knife head has blocking surface for blocking surface thread and bottom thread;Above-mentioned moving knife can reduce the pulling force of surface thread and bottom thread intersection position by blocking surface thread, reduce the possibility that surface thread pulls out bottom thread from between bottom thread holding spring and moving knife;In addition, blocking surface thread can also change the direction of pulling force of surface thread and bottom thread intersection position, so that bottom thread is resisted by blocking surface under the action of pulling force, further reduce the possibility of being pulled out.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewing machine related technical field, in particular to a kind of moving knife and double needle sewing machine. BACKGROUND

[0002] Double needle machine as horizontal shuttle type sewing machine, its stitch is lock stitch, due to the basic characteristics of lock stitch, thread must pass a circle from the shuttle under the shuttle, cross with bottom thread to form stitch;Conventional double needle machine thread cutting machine needle on the thread and the thread on the shuttle will be clamped between moving knife and bottom thread retaining spring;

[0003] When cutting thread, user must separate from the sewing material, so that the thread on the needle is separated from the bottom thread retaining spring, but due to the intersection of thread and bottom thread, in the process of thread separation, the intersection part as a stress point, so that the thread is easy to pull the bottom thread from the thread clamp, so that the first few stitches are not sewn up when the next stitch, serious will lead to directly not bring the bottom thread, the whole stitch is off bottom thread. SUMMARY

[0004] Therefore, it is necessary to provide a moving knife and double needle sewing machine that does not pull the bottom thread out when the thread is separated, to solve the problem that the thread is easily pulled out of the thread clamp when the thread is separated after cutting.

[0005] The present application first provides a moving knife for cutting the sewing material with the needle, shuttle, fixed knife and bottom thread retaining spring, the hooking groove is formed on the side of the moving knife close to the shuttle along the third direction, the hooking groove penetrates the moving knife along the first direction, the blocking piece is arranged on the side of the moving knife away from the fixed knife along the first direction, the blocking piece is fixed to the moving knife and located on the side of the hooking groove close to the moving knife head along the second direction, and the blocking piece has a blocking surface for blocking the thread and the bottom thread on the side of the blocking piece away from the moving knife head along the second direction.

[0006] The above moving knife can reduce the pulling force of the thread and the bottom thread at the intersection position by blocking the thread with the blocking surface, and reduce the possibility of pulling the bottom thread out of the bottom thread retaining spring and the moving knife. In addition, the blocking surface can change the direction of the pulling force of the thread and the bottom thread at the intersection position, so that the bottom thread is in contact with the blocking surface under the action of the pulling force, and the possibility of pulling out the bottom thread is further reduced.

[0007] In one embodiment, the moving knife is provided with a guide groove on the side close to the fixed knife along the first direction, the guide groove is in communication with one end of the hooking groove, and the other end extends to the side of the moving knife head along the second direction.

[0008] It can be understood that the guide groove can store a part of the face thread and the bottom thread, so that the length of the thread end of the face thread connected with the needle and the bottom thread connected with the rotating hook is relatively long after the thread cutting is completed, thereby facilitating subsequent re-stitching.

[0009] In one of the embodiments, the included angle between the side of the moving knife away from the fixed knife and the blocking surface in the first direction is an acute angle.

[0010] It can be understood that the acute angle can hook the face thread after the face thread abuts against the blocking surface, thereby reducing the possibility of the face thread separating from the blocking surface, and further ensuring the blocking effect of the blocking member.

[0011] In one of the embodiments, the blocking member is fixed with a limiting member protruding from the blocking member to the side away from the moving knife head in the second direction; and / or, the intersection position of the side of the moving knife away from the fixed knife and the blocking surface is provided with a limiting groove in the first direction, and the limiting groove penetrates the blocking member and the moving knife in the third direction.

[0012] It can be understood that the limiting member or the limiting groove is beneficial to the blocking member hooking the face thread, thereby reducing the possibility of the face thread separating from the blocking surface, and ensuring the blocking effect of the blocking member.

[0013] In one of the embodiments, one end of the blocking surface away from the rotating hook is a first supporting position, and the other end close to the rotating hook is a second supporting position, and the blocking surface is inclined to the direction close to the moving knife head from the first supporting position to the second supporting position.

[0014] It can be understood that when the face thread is pulled, the inclined blocking surface can play a certain guiding role, which is beneficial to the bottom thread being pulled to the clamping position of the bottom thread holding spring and the moving knife by the pulling force at the intersection position.

[0015] In one of the embodiments, one end of the blocking surface away from the rotating hook is a first supporting position, and the other end close to the rotating hook is a second supporting position, and the second supporting position corresponds to the center line of the bottom thread holding spring.

[0016] It can be understood that by corresponding the second supporting position to the center line of the bottom thread holding spring, the bottom thread can be pulled to the center line position of the bottom thread holding spring under the action of the pulling force at the intersection position, and at this time, the stroke required for the bottom thread to separate from the bottom thread holding spring on either side of the third direction is relatively long, thereby further increasing the clamping firmness of the bottom thread.

[0017] In one of the embodiments, the thickness of the blocking member is less than or equal to 1 mm.

[0018] It can be understood that by setting the thickness of the blocking member to be less than or equal to 1 mm, the occurrence of such interference can be effectively avoided, thereby increasing the universality of the moving knife of the application.

[0019] In one embodiment, the blocking surface is an arc surface.

[0020] It can be understood that the arc surface facilitates the pulling of the surface thread and effectively reduces the abrasion between the surface thread and the blocking surface when the surface thread is pulled out, thereby reducing the possibility of the surface thread being pulled off.

[0021] In one embodiment, the blocking member is in a columnar shape.

[0022] The second aspect of the present application provides a double-needle sewing machine comprising the above-mentioned moving knife. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the moving knife part in the prior art double-needle machine;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the moving knife in the prior art when the surface thread is pulled out after the thread is cut;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the moving knife part in the double-needle machine of the present application;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application; Figure 3

[0029] It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application; Figure 6 Figure 3 It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application;

[0030] Figure 7 Figure 3 It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application;

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application; Figure 3

[0032] It is a schematic diagram of the three-dimensional structure of the moving knife in one embodiment of the present application; Figure 9 Figure 8 It is a schematic diagram of the enlarged structure of the moving knife in one embodiment of the present application;​​​

[0033] Figure 10 Fig. 2 is a schematic view of the top structure of the moving knife in the state of Fig. 1; Figure 8

[0034] Figure 11 Fig. 3 is a schematic view of the bottom structure of the moving knife in the state of Fig. 1; Figure 8

[0035] Figure 12 Fig. 4 is a schematic view of the moving knife in the state of Fig. 1 after the face thread is extracted; Figure 10

[0036] Figure 13 Fig. 5 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Figure 12

[0037] Fig. 6 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Figure 14

[0038] Fig. 7 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Figure 15

[0039] Fig. 8 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Figure 16

[0040] Fig. 9 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Figure 17

[0041] Fig. 10 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted. Figure 18 Fig. 1 is a schematic view of the moving knife in the state of Fig. 1; Fig. 2 is a schematic view of the top structure of the moving knife in the state of Fig. 1; Fig. 3 is a schematic view of the bottom structure of the moving knife in the state of Fig. 1; Fig. 4 is a schematic view of the moving knife in the state of Fig. 1 after the face thread is extracted; Fig. 5 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Fig. 6 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Fig. 7 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Fig. 8 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Fig. 9 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted; Fig. 10 is a schematic view of the moving knife in the state of Fig. 1 after the bottom thread is extracted. 100, face thread; 200, bottom thread; 10, moving knife; 11, hook thread groove; 12, blocking piece; 121, blocking surface; 12a, first blocking position; 12b, second blocking position; 13, guide groove; 14, limiting piece; 20, machine needle; 30, rotating shuttle; 31, shuttle needle; 32, clamping groove; 33, rotating shuttle guard hook; 40, fixed knife; 50, bottom thread retaining spring.

[0042] DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] ​​​​It is to be understood that where the terms specific connecting or securing means are deemed appropriate, other connecting or securing means can be used instead. Also, it is to be understood that where a component is referred to as being "on" or "connected to" another component that it can be directly on or connected to, or intervening components can be present. Where an element is considered a "connection" to another element, it can be directly connected to the other element or intervening elements can be present. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] In addition, the terms "first", "second", etc. are used herein only to describe various conditions, and are not to be construed as indicating or implying relative importance or a specific order. Thus, features with a "first", "second" designation can include at least one of the features, explicitly or implicitly.

[0046] In the present application, unless specifically stated and limited otherwise, the terms "on", "under", "above" and "below" are used in relation to the first feature in relation to the second feature, can mean that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "below", "under" and "under" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0047] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0048] Please refer to Figure 1 and Figure 2 As shown in FIGS. 1 to 3, the double-needle machine is a horizontal rotating shuttle type sewing machine, and the stitch is a lock stitch. The bottom thread P200 extends from the rotating shuttle P30 and is connected to the sewing material, and the face thread P100 extends from the needle P20 and is connected to the sewing material.

[0049] The normal sewing process of the double needle machine is as follows: the needle P20 pierces the sewing material, the top thread P100 is sent to the lower side of the sewing material, the top thread P100 is guided by the rotating hook P30 to pass through a loop below the shuttle hook P31 of the rotating hook P30, so as to cross the bottom thread P200, the thread tensioner drives the needle P20 to rise and tighten the top thread P100, so that the crossed top thread P100 and the bottom thread P200 form a lock stitch, and the above process is repeated to complete sewing.

[0050] The cutting thread action is to cut the top thread P100 and the bottom thread by the moving knife P10 during the normal sewing process to end the sewing.

[0051] The conventional cutting thread action of the double needle machine is as follows: after the needle P20 pierces the sewing material and the top thread P100 is sent to the lower side of the sewing material, the moving knife P10 cuts through the thread loop formed by the top thread P100, one side of the top thread P100 enters the hook portion P11 of the moving knife P10, and the other side of the top thread P100 is guided by the rotating hook P30 to pass through a loop below the shuttle hook P31 of the rotating hook P30, so as to cross the bottom thread P200, then the top thread P100 is tightened as the thread tensioner moves upward, the top thread P100 brings the bottom thread P200 into the hook portion P11 of the moving knife P10, so that the top thread P100 and the bottom thread P200 enter the hook portion P11 of the moving knife P10, then the moving knife P10 and the fixed knife P40 cut the top thread P100 and the bottom thread P200 as the moving knife P10 retracts, the top thread P100 extended from the needle P20 and the bottom thread P200 extended from the rotating hook P30 are clamped between the moving knife P10 and the bottom thread retaining spring P50, and the cutting thread action is completed.

[0052] After cutting the thread, the user needs to remove the sewing material, which will remove the top thread P100 on the needle P20 from between the bottom thread retaining spring P50 and the moving knife P10, but since the top thread P100 and the bottom thread P200 cross, the crossing part acts as a force point during the removal of the top thread P100, and the top thread P100 easily pulls the bottom thread P200 out of the bottom thread retaining spring P50 and the moving knife P10, which will cause the first few stitches to not sew the thread during the next sewing, and in severe cases, the bottom thread P200 will be completely removed from the thread.

[0053] In view of the above problems, please combine Figure 3 and Figure 4As shown, the application first provides a moving knife for cutting off the sewing material in cooperation with the needle 20, the rotating hook 30, the fixed knife 40 and the bottom thread holding spring 50. The moving knife 10 is provided with a thread hooking groove 11 on the side close to the side surface of the rotating hook 30 along the third direction 3. The thread hooking groove 11 penetrates the moving knife 10 along the first direction 1. The moving knife 10 is provided with a blocking piece 12 on the side away from the fixed knife 40 along the first direction 1. The blocking piece 12 is fixed to the moving knife 10 and located on the side close to the blade head of the moving knife 10 along the second direction 2. The blocking piece 12 is provided with a blocking surface 121 for blocking the surface thread 100 and the bottom thread 200 on the side away from the blade head of the moving knife 10 along the second direction 2.

[0054] Wherein, the first direction 1, the second direction 2 and the third direction 3 are perpendicular to each other. The first direction 1 is the direction of reciprocating movement of the needle 20. The second direction 2 is the direction of reciprocating movement of the moving knife 10. The bottom thread 200 extends from the rotating hook 30 and is connected with the sewing material. The surface thread 100 extends from the needle 20 and is connected with the sewing material.

[0055] The thread cutting action of the moving knife 10 of the application is the same as that of the prior art. However, due to the difference in structure of the moving knife 10, when the moving knife 10 of the application is used to cut the thread and separate from the sewing material, the position and stress state of the surface thread 100 and the bottom thread 200 are different from those of the prior art. The specific thread hooking and cutting action of the application is as follows:

[0056] First step, please refer to Figure 5 As shown, the rotating hook 30 hooks and drives a segment of the surface thread 100 extending from the needle 20 to rotate, so that the thread loops of the two segments of the surface thread 100 gradually expand. In this process, the moving knife 10 cuts through the thread loops. When the moving knife 10 reaches the limit position (i.e. the extension position), it remains stationary. Then, with the rotation of the rotating hook 30, the thread loops continuously expand. At this time, the segment of the surface thread 100 extending from the needle 20 (i.e. the segment of the surface thread 100 hooked and driven by the rotating hook 30) is located on one side of the moving knife 10. The segment of the surface thread 100 extending from the sewing material and the bottom thread 200 are located on the other side of the moving knife 10.

[0057] Second step, please refer to Figure 6As shown, as the rotary hook 30 rotates, the top thread 100 (extending from the needle 20) above the bobbin 31 wraps around once, and the top thread 100 (extending from the fabric) at the bottom of the bobbin 31 also wraps around once, causing the top thread 100 to cross with the bottom thread 200 (due to the formation of lockstitch). At this time, the top thread 100 above the bobbin 31 will disengage from the slot 32 on the bobbin 31 and disengage from the rotary hook guard 33. At this time, the moving cutter 10 begins to return to its original position. As the moving cutter 10 returns to its original position and the top thread 100 extending from the needle 20 is continuously tightened under the action of the take-up lever, the top thread 100 and the bottom thread 200 on the side of the moving cutter 10 closest to the rotary hook 30 will be tightened together at the hook groove 11 of the moving cutter 10.

[0058] Step 3, please refer to Figure 7 As shown, as the rotary hook 30 continues to rotate, the top thread 100 on the rotary hook 33 will further detach from the rotary hook 33. At this time, the intersection of the top thread 100 and the bottom thread 200 has been formed. The moving cutter 10 continues to return, and the top thread 100 and the bottom thread 200 on the side of the moving cutter 10 closest to the rotary hook 30 completely enter the hook groove 11 of the moving cutter 10.

[0059] Fourth step, please combine Figure 8 , Figure 9 as well as Figure 10 As shown, when the cutter moves 10 times back to its limit position (i.e., retracts to the work station), three actions occur simultaneously during this process:

[0060] First, the top thread 100 extending from the needle 20 completely detaches from the rotary hook 33. On the side of the moving cutter 10 near the rotary hook 30, the top thread 100 and the bottom thread 200 will form an intersection. Due to the presence of the blocking part 12 and the pulling of the top thread 100 and the bottom thread 200 when the moving cutter 10 returns, the top thread 100 and the bottom thread 200 extending from the needle 20 will be hooked by the blocking surface 121.

[0061] Secondly, the surface line 100 and the bottom line 200 located on the upper side of the moving cutter 10 will be affected by the cutting edge of the moving cutter 10 and the fixed cutter 40 ( Figure 8 The meshing (not shown in the image) cuts off this portion of the top line 100 and the bottom line 200;

[0062] Secondly, the bottom line maintains a spring size of 50 ( Figure 8 , Figure 9 (Not shown) It will work with the lower end face of the moving blade 10 to clamp the cross-shaped surface line 100 and the bottom line 200.

[0063] Please combine Figure 11 , Figure 12 as well as Figure 13As shown, after completing the above hooking and cutting actions, the user needs to pull away the sewing material. This will pull the top thread 100 on the needle 20 away from the bottom thread retaining spring 50 and the moving blade 10. However, since the top thread 100 and the bottom thread 200 intersect, during the process of pulling the top thread 100 away, the intersection point acts as a force point, and the top thread 100 can easily pull the bottom thread 200 out from between the bottom thread retaining spring 50 and the moving blade 10.

[0064] In this application, the blocking surface 121 can block the top thread 100 and the bottom thread 200, reducing or even avoiding the possibility that the top thread 100 will pull the bottom thread 200 out from between the bottom thread retaining spring 50 and the moving knife 10. The sewing rate reaches more than 98%, which can ensure that the bottom thread 200 is in a clamped state after each thread cutting and pulling of the top thread 100.

[0065] Specifically, the end of the blocking surface 121 away from the rotary shuttle 30 is the first support position 12a, and the end closer to the rotary shuttle 30 is the second support position 12b.

[0066] When the top thread 100 extending from the needle 20 is pulled away from the bottom thread retaining spring 50 and the moving blade 10, since the top thread 100 and the bottom thread 200 intersect, the top thread 100 will exert a pulling force on the bottom thread 200 at the intersection, which will cause the bottom thread 200 to separate from the bottom thread retaining spring 50 and the moving blade 10. In this application, the first support position 12a can serve as a force fulcrum to share and reduce part of the pulling force, thereby reducing or even avoiding the possibility that the top thread 100 will pull the bottom thread 200 out from the bottom thread retaining spring 50 and the moving blade 10.

[0067] Furthermore, the first support position 12a, acting as a fulcrum, can also change the direction of the pulling force, causing the bottom line 200 to tend to move towards the first support position 12a under the action of the pulling force at the intersection. At this time, the bottom line 200 will come into contact with the second support position 12b, which will act as a force point for the bottom line 200, blocking it and further reducing the possibility of the bottom line 200 being pulled out by the pulling force of the surface line 100. At the same time, the bottom line 200, located between the bottom line retaining spring 50 and the moving blade 10, will move towards the first support position 12a under the action of the pulling force, thereby increasing the stroke required for the bottom line 200 to detach from the bottom line retaining spring 50 and increasing the clamping reliability of the bottom line 200.

[0068] Please combine Figure 3 and Figure 7 As shown, in some embodiments, the moving blade 10 has a guide groove 13 on its side near the fixed blade 40 along the first direction 1. The guide groove 13 is connected to the hook groove 11 at one end, and the other end extends towards the blade head of the moving blade 10 along the second direction 2.

[0069] In the third step of the thread hooking principle of the present application, after the face thread 100 and the bottom thread 200 on the side of the moving knife 10 close to the rotating hook 30 completely enter the thread hooking groove 11 of the moving knife 10, the face thread 100 and the bottom thread 200 entering the thread hooking groove 11 will also enter the guide groove 13 on the moving knife 10 due to the existence of the guide groove 13. The guide groove 13 can store a part of the face thread 100 and the bottom thread 200, so that the thread ends of the face thread 100 connected with the needle 20 and the bottom thread 200 connected with the rotating hook 30 are relatively long after the thread cutting is completed, thereby facilitating the subsequent re-sewing of the thread.

[0070] In some embodiments, the side wall of the guide groove 13 close to the side of the moving knife 10 close to the knife head is a blade edge, which can cooperate with the fixed knife 40 to cut the face thread 100 and the bottom thread 200.

[0071] Please refer to Figure 14 In some embodiments, the included angle between the side surface of the moving knife 10 away from the fixed knife 40 along the first direction 1 and the blocking surface 121 is an acute angle. The acute angle can hook the face thread 100 after the face thread 100 abuts against the blocking surface 121, thereby reducing the possibility of the face thread 100 separating from the blocking surface 121, and further ensuring the blocking effect of the blocking piece 12.

[0072] Please refer to Figure 15 In some embodiments, the blocking piece 12 is fixed with a limiting piece 14 protruding from the blocking piece 12 away from the side of the moving knife 10 close to the knife head along the second direction 2; and / or, the intersection position of the side surface of the moving knife 10 away from the fixed knife 40 along the first direction 1 and the blocking surface 121 is provided with a limiting groove (not shown in the figure), and the limiting groove penetrates through the blocking piece 12 and the moving knife 10 along the third direction 3.

[0073] The limiting piece 14 or the limiting groove is beneficial to the blocking piece 12 hooking the face thread 100, thereby reducing the possibility of the face thread 100 separating from the blocking surface 121 and ensuring the blocking effect of the blocking piece 12. The limiting piece 14 is fixed to the blocking piece 12 by commonly used fixed connection methods such as riveting and welding. Preferably, the limiting piece 14 is fixed to the side end surface of the blocking piece 12 away from the fixed knife 40.

[0074] Please refer to Figure 16 In some embodiments, the blocking surface 121 is inclined from the first support position 12a to the second support position 12b towards the direction close to the knife tip of the moving knife 10. Therefore, when the face thread 100 is pulled, the inclined blocking surface 121 can play a certain guiding role, which is beneficial to the bottom thread 200 being pulled to the clamping position of the bottom thread holding spring 50 and the moving knife 10 by the pulling force at the intersection position.

[0075] Please refer to Figure 17As shown, in some embodiments, the second support position 12b corresponds to the middle line of the bottom thread retaining spring 50; during the process of pulling the surface thread 100, the first support position 12a can serve as a force fulcrum to change the direction of the pulling force of the intersection position of the surface thread 100 and the bottom thread 200, so that the bottom thread 200 has a tendency to move to the first support position 12a, and in this process, the second support position 12b will block the bottom thread 200 as a force point of the bottom thread 200; in the present application, by corresponding the second support position 12b to the middle line of the bottom thread retaining spring 50, the bottom thread 200 can be pulled to the middle line position of the bottom thread retaining spring 50 under the action of the pulling force at the intersection position, at this time, the required stroke of the bottom thread 200 to separate from the bottom thread retaining spring 50 on either side of the third direction 3 is relatively long, thereby further increasing the clamping firmness of the bottom thread 200.

[0076] In some embodiments, the thickness of the blocking piece 12 is less than or equal to 1 mm; if the thickness of the blocking piece 12 is too large, due to the different distances between the moving knife 10 and the rotating shuttle 30 of different devices, there is a possibility of collision interference between the moving knife 10 and the rotating shuttle 30 during the movement of the moving knife 10 along the second direction 2, which may cause damage to the device; therefore, by setting the thickness of the blocking piece 12 to be less than or equal to 1 mm, such interference can be effectively avoided, thereby increasing the universality of the moving knife 10 of the present application.

[0077] In some embodiments, the thickness of the blocking piece 12 is equal to 1 mm; if the thickness of the blocking piece 12 is too small, it will result in poor blocking effect of the surface thread 100 and the bottom thread 200, thereby affecting the anti-dropping effect of the present application; therefore, by setting the thickness of the blocking piece 12 to be 1 mm, the universality can be maximized on the basis of ensuring the anti-dropping effect.

[0078] In some embodiments, the blocking surface 121 is an arc surface, so as to facilitate the pulling out of the surface thread 100, and the arc surface can effectively reduce the wear between the surface thread 100 and the blocking surface 121 during the pulling out of the surface thread 100, thereby reducing the possibility of the surface thread 100 being pulled off.

[0079] In some embodiments, the blocking piece 12 can be obtained by casting, material reduction processing or the like, and can also be fixed with the moving knife 10 by commonly used fixing connection modes such as welding, interference fit or bolt connection, which is not limited in the present application.

[0080] Please refer to Figure 18 As shown, in some embodiments, the blocking piece 12 is in a columnar shape, the moving knife 10 is provided with a pin hole through the first direction 1, and the blocking piece 12 is in interference fit with the pin hole.

[0081] In some embodiments, the blocking piece 12 is a bolt or a screw, the moving knife 10 is provided with a threaded hole through the first direction 1, and the blocking piece 12 is connected with the threaded hole through threads.

[0082] In some embodiments, the blocking piece 12 is located at the knife head end of the moving knife 10 and is inclined downward, and the intersection position of the blocking piece 12 and the moving knife 10 forms a blocking surface 121.

[0083] The second aspect of the present application provides a double-needle sewing machine comprising the moving knife described above.

[0084] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0085] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent protection scope of the present application. It should be pointed out that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A movable blade for cooperating with a needle (20), a rotary hook (30), a fixed blade (40), and a bobbin retaining spring (50) to cut sewing material, characterized in that, The movable blade (10) is located between the fixed blade (40) and the bottom line retaining spring (50) along the first direction (1). The movable blade (10) moves along the second direction (2) to cooperate with the fixed blade (40) to cut the top line (100) and the bottom line (200). The movable blade (10) is also used to cooperate with the bottom line retaining spring (50) to clamp the top line (100) and the bottom line (200) at the intersection. The moving blade (10) has a hook groove (11) on its side near the rotary hook (30) along the third direction (3), and the hook groove (11) passes through the moving blade (10) along the first direction (1). The moving blade (10) is provided with a blocking member (12) on the side away from the fixed blade (40) along the first direction (1). The blocking member (12) is fixed to the moving blade (10) and located on the side of the hook groove (11) close to the head of the moving blade (10) along the second direction (2). The blocking member (12) has a blocking surface (121) for blocking the face line (100) and the bottom line (200) on the side away from the head of the moving blade (10) along the second direction (2).

2. The moving blade according to claim 1, characterized in that, The moving blade (10) has a guide groove (13) on the side of the fixed blade (40) along the first direction (1). The guide groove (13) is connected to the hook groove (11) at one end, and the other end extends along the second direction (2) toward the blade head of the moving blade (10).

3. The moving blade according to claim 1, characterized in that, The angle between the side of the moving blade (10) away from the fixed blade (40) along the first direction (1) and the blocking surface (121) is an acute angle.

4. The moving blade according to claim 1, characterized in that, The blocking member (12) is fixedly provided with a limiting member (14) that protrudes from the blocking member (12) along the second direction (2) away from the cutting head of the moving blade (10); and / or, The moving blade (10) has a limiting groove at the intersection of the side of the fixed blade (40) away from the first direction (1) and the blocking surface (121). The limiting groove passes through the blocking member (12) and the moving blade (10) along the third direction (3).

5. The moving blade according to claim 1, characterized in that, The end of the blocking surface (121) away from the rotary hook (30) is the first support position (12a), and the end closer to the rotary hook (30) is the second support position (12b). The blocking surface (121) is inclined from the first support position (12a) to the second support position (12b) towards the tip of the moving blade (10).

6. The moving blade according to claim 1, characterized in that, The end of the blocking surface (121) away from the rotary hook (30) is the first support position (12a), and the end closer to the rotary hook (30) is the second support position (12b). The second support position (12b) corresponds to the center line of the bottom retaining spring (50).

7. The moving blade according to claim 1, characterized in that, The thickness of the blocking element (12) is less than or equal to 1 mm.

8. The moving blade according to claim 1, characterized in that, The blocking surface (121) is an arc surface.

9. The moving blade according to claim 1, characterized in that, The blocking element (12) is columnar.

10. A double-needle sewing machine, characterized in that, Includes the moving blade as described in any one of claims 1 to 9.

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