Right thread hook of sewing machine, thread passing mechanism, sewing machine and upper thread track of right thread hook

Abstract

The invention provides a sewing machine right thread hook, a thread passing mechanism, a sewing machine and a right thread hook upper thread track, the sewing machine right thread hook comprises a fixing portion and a guiding portion, the guiding portion is slidably connected to the fixing portion, an upper thread is arranged in the guiding portion in a penetrating mode, and the guiding portion can slide on the fixing portion along with the upper thread to enable the upper thread to be in a low-tension position. The guide part is connected to the fixing part in a sliding mode, so that the thread containing range of the thread passing part comprises the movement range of the thread clamping face of the large thread clamping device and the movement range of the thread passing hole of the take-up lever, when sewing work is carried out, the guide part can slide on the fixing part along with an upper thread, the upper thread is made to be located at the low-tension position all the time, the change amplitude of tension is reduced, and sewing efficiency is improved. And the problems of line throwing and line breaking are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machine equipment, and in particular to a right thread hook of a sewing machine, a thread passing mechanism, a sewing machine and a surface thread track of the right thread hook. Background Art

[0002] Existing sewing machines generally control the surface thread tension by adjusting the clamping force of the large thread clamp, and determine the thread supply amount by adjusting the left and right positions of the right thread hook. In sewing processes such as passing through stems and multi-layer fabrics, the thickness of the sewing material is thicker or the density is higher, and the friction at the needle hole is greater. If the clamping force of the large thread clamp is insufficient, the surface thread will be thrown when the thread is taken up. If the clamping force of the large thread clamp is adjusted too large, when the thread picking mechanism takes up the thread and tightens the surface thread, and the surface thread needs to be pulled out from the large thread clamp, the internal tension of the surface thread is stretched to make up for a certain amount of required thread. At this time, the more thread passing parts there are between the large thread clamp and the needle, the more complex the thread path, the more bends and turns, and the more times the tension changes; the larger the turning angle, the greater the amplitude of the tension change, which leads to defects such as skipped stitches and thread breakage.

[0003] In the prior art, the right thread hook is mainly used to adjust the thread supply before sewing begins, and the right thread hook is fixed on the sewing machine head when sewing begins. During sewing, the surface thread passes through "thread rack-three-eye thread hook-small thread clamp-large thread clamp-slow thread hook-right thread hook-thread take-up rod-left thread hook-electronic thread clamp-needle bar lower bushing thread hook-needle bar thread hook-machine needle" in this order. Among them, the plane where the two sections of surface thread of "large thread clamp-slow thread hook" and "slow thread hook-right thread hook" are located is not the same plane as the plane where the two sections of surface thread of "slow thread hook-right thread hook" and "right thread hook-thread take-up rod" are located. The larger the spatial angle of the surface thread of "large thread clamp-slow thread hook" relative to the clamping surface of the large thread clamp, the worse the stress condition of the large thread clamp; the larger the spatial angle of the surface thread of "slow thread hook-right thread hook" and the surface thread of "right thread hook-thread take-up rod", the greater the change in the tension of the thread, and the problems such as thread throwing and thread breaking are prone to occur. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a right thread hook of a sewing machine, a thread passing mechanism, a sewing machine and a right thread hook surface thread trajectory, adjust the angle between the surface thread at the "large thread clamp-slow thread hook-right thread hook-thread take-up rod" and the thread clamping surface of the large thread clamp, reduce the spatial folding angle of the surface thread, improve the stress condition of the large thread clamp, improve the stability of the surface thread, and reduce the variation amplitude of the surface thread tension.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a right thread hook of a sewing machine, including a fixing part and a guiding part, wherein the guiding part can be slidably connected to the fixing part, the surface thread is passed through the guiding part, and the guiding part can slide on the fixing part following the surface thread, so that the surface thread is in a low-tension position.

[0006] Preferably, a slide groove is provided on the side surface of the fixing portion, and a slider is provided on the side surface of the guiding portion, and the slider moves along the extending direction of the slide groove.

[0007] Preferably, a through hole or a through groove is provided in the guide portion, and the through hole or the through groove is a wire passing portion; the surface wire passes through the through hole or the through groove.

[0008] To achieve the above purpose or other purposes, the present invention also discloses a thread passing mechanism, which is installed on the head of a sewing machine; the thread passing mechanism includes a large thread clamp, a thread take-up rod, a slow thread hook, and the above-mentioned right thread hook; the large thread clamp is provided with two opposite thread clamping pieces, a large thread clamping surface is formed between the two thread clamping pieces, and a thread take-up rod thread passing hole is provided on the thread take-up rod; the surface thread passes through the large thread clamping surface, enters into the thread take-up rod through the slow thread hook and the right thread hook, and passes out from the thread take-up rod thread passing hole of the thread take-up rod.

[0009] Preferably, a fixing part connecting groove is provided on the fixing part, a right thread hook connecting hole is provided on the sewing machine head, the fixing part connecting groove is aligned with the right thread hook connecting hole, and a fastener is passed through the two.

[0010] Preferably, the extending direction of the fixing portion is the same as the radial direction of the wire clamping piece, and the extending direction of the guiding portion is the same as the axial direction of the wire clamping piece.

[0011] In order to achieve the above purpose or other purposes, the present invention also discloses a sewing machine, including the above-mentioned thread passing mechanism.

[0012] To achieve the above purpose or other purposes, the present invention also discloses a right-thread hook surface thread trajectory, which adopts the above-mentioned sewing machine; a thread passing portion is provided in the guide portion, and the thread accommodating range of the thread passing portion includes the thread clamping surface of the large thread clamp and the movement range of the thread passing hole of the thread take-up rod; during the sewing process, when the thread take-up rod drives the surface thread to be in a taut state, the surface thread is tightly attached to the thread passing portion of the right thread hook and is in a straight line state in real time; the guide portion follows the surface thread to slide on the fixed portion, so that the surface thread is in a low-tension position.

[0013] Preferably, the surface thread between the large thread clamp and the slow thread hook is the first section of the surface thread, the surface thread between the slow thread hook and the right thread hook is the second section of the surface thread, and the surface thread between the right thread hook and the thread passing hole of the thread take-up rod is the third section of the surface thread; the thread accommodating range of the thread passing portion includes the movement range of the thread passing hole of the thread take-up rod, and during the sewing process, the extension direction of the second section of the surface thread and the extension direction of the third section of the surface thread are in a state of overlap in real time; the thread accommodating range of the thread passing portion includes the clamping surface of the large thread clamp, and during the sewing process, the angle between the first section of the surface thread and the clamping surface of the large thread clamp changes within a certain range.

[0014] As described above, the right thread hook of a sewing machine, the thread passing mechanism, the sewing machine and the right thread hook surface thread track of the present invention have the following beneficial effects:

[0015] 1. The present invention relates to a right thread hook of a sewing machine, a thread passing mechanism, a sewing machine and a surface thread track of the right thread hook. The guide part is slidably connected to the fixed part, so that the thread holding range of the thread passing part includes the thread clamping surface of the large thread clamp and the motion range of the thread passing hole of the thread take-up rod. When sewing, the guide part can slide on the fixed part following the surface thread, so that the surface thread is always in a low tension position, reducing the amplitude of tension change and avoiding the problems of thread throwing and thread breaking.

[0016] 2. The present invention relates to the right thread hook of the sewing machine, the thread passing mechanism, the sewing machine and the surface thread track of the right thread hook. The guide part can follow the surface thread to slide on the fixed part, which can reduce the spatial angle between the first section of the surface thread and the clamping surface of the large thread clamp, and between the second section of the surface thread and the third section of the surface thread, improve the stress condition of the large thread clamp, improve the stability of the surface thread, reduce the tension of the surface thread, thereby reducing the occurrence of problems such as thread throwing and thread breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a sewing machine head of a sewing machine according to the present invention;

[0018] Figure 2 This is a schematic diagram of a second connection structure of the right thread hook of the sewing machine according to the present invention;

[0019] Figure 3 It is a schematic diagram of a third connection structure of the right thread hook of the sewing machine according to the present invention;

[0020] Figure 4 This is a schematic diagram of a first connection structure of the right thread hook of a sewing machine according to the present invention;

[0021] Figure 5 It is a first schematic diagram of the right hook surface line trajectory of the present invention;

[0022] Figure 6 A second schematic diagram of the right hook surface line trajectory of the present invention;

[0023] Figure 7 It is a third schematic diagram of the right hook surface line trajectory involved in the present invention.

[0024] Description of reference numerals:

[0025] 1. Sewing machine head; 2. Large thread clamp; 3. Thread slow hook; 4. Right thread hook; 41. Fixed part; 411. Fixed part connecting groove; 42. Guide part; 421. Thread passing part; 422. Bending part; 423. Moving part; 43. Annular part; 5. Thread take-up lever; 61. First section of surface thread; 62. Second section of surface thread; 63. Third section of surface thread; 7. Thread clamping surface of large thread clamp. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] The present invention provides a right thread hook for a sewing machine, which is installed on a sewing machine head 1. For the convenience of description, the length direction of the sewing machine head 1 is defined as the left-right direction, the width direction of the sewing machine head 1 is defined as the front-back direction, and the height direction of the sewing machine head 1 is defined as the up-down direction. Figure 5 As shown, the left direction and the right direction of the paper are the front direction and the rear direction respectively, the front side and the back side of the paper are the left direction and the right direction respectively, and the upper direction and the lower direction of the paper are the upper direction and the lower direction respectively.

[0029] like Figure 1-Figure 4 As shown, the present invention provides a right thread hook for a sewing machine, including a fixing portion 41 and a guiding portion 42, wherein the guiding portion 42 can be slidably connected to the fixing portion 41, the surface thread is passed through the guiding portion 42, and the guiding portion 42 can slide along the front-rear direction on the fixing portion 41 following the surface thread, so that the surface thread is in a low-tension position.

[0030] The right thread hook of the sewing machine involved in the present invention, when sewing, the surface thread will drive the guide part 42 to slide on the fixed part 41 along the front-back direction, so that the surface thread is always in a low-tension position, reducing the tension change range and avoiding the problem of thread throwing and thread breaking.

[0031] In this embodiment, the guide portion 42 is slidably disposed on the fixing portion 41, and the specific connection method is as follows:

[0032] The first connection structure:

[0033] like Figure 4As shown, the guide part 42 is slidably arranged on the fixed part 41, and a through hole or a through groove is provided in the guide part 42, and the through hole or the through groove is a thread passing part 421, and the surface thread passes through the through hole or the through groove. Further, in this connection structure, a slide groove is provided on the left side surface of the fixed part 41 along the front-to-back direction, and a slider is provided on the right side surface of the guide part 42, and the slider moves back and forth in the slide groove. When the surface thread swings in the front-to-back direction under the action of the thread take-up rod 5, the surface thread will swing back and forth in the through hole or the through groove, thereby driving the guide part 42 to slide in the slide groove, and the movement range of the through hole or the through groove exceeds the rear boundary of the movement range of the thread take-up rod thread passing hole, and also exceeds the large thread clamping surface 7. In this connection structure, the guide part 42 includes a thread passing part 421 and a moving part 423.

[0034] In other embodiments, the connection between the guide portion 42 and the fixing portion 41 further includes the following structure:

[0035] The second connection structure:

[0036] like Figure 2 As shown, the front end of the guide portion 42 is connected to the fixed portion 41, and the guide portion 42 and the fixed portion 41 are connected by a smooth curved transition; the rear end of the guide portion 42 is provided with an annular portion 43, and the annular portion 43, the guide portion 42, and the fixed portion 41 form a closed loop, and the right side of the guide portion 42 is the thread passing portion 421, and the surface thread passes through the closed loop and fits with the guide portion 42. Compared with the conventional right thread hook 4, the front end of the thread passing portion 421 of the guide portion 42 in the present application remains unchanged, and the rear end of the thread passing portion 421 exceeds the rear boundary of the motion range of the thread taking rod thread passing hole, and also exceeds the thread clamping surface 7 of the large thread clamp.

[0037] The third connection structure:

[0038] like Figure 3 As shown, the third connection structure is basically the same as the second connection structure, and the difference is that in the third connection structure, the front end of the guide portion 42 is bent backward to form a bent portion 422, which reduces the internal space of the closed loop. Compared with the second connection structure, the thread passing portion 421 has a smaller thread tolerance range, which can reduce the random swing amplitude of the surface thread on the thread passing portion 421 and improve the stability of the surface thread.

[0039] To achieve the above purposes or other purposes, such as Figure 1 As shown, the present invention also discloses a thread passing mechanism, which includes a large thread clamp 2, a thread take-up rod 5, a slow-thread hook 3, and the above-mentioned right thread hook 4; two opposite thread clamping pieces are arranged on the large thread clamp 2, a large thread clamping surface 7 is formed between the two thread clamping pieces, and a thread take-up rod thread passing hole is opened on the thread take-up rod 5; the surface thread passes through the large thread clamping surface 7, enters into the thread take-up rod 5 through the slow-thread hook 3 and the right thread hook 4, and passes out from the thread take-up rod thread passing hole of the thread take-up rod 5.

[0040] Preferably, Figure 2-Figure 4 As shown, a fixing portion connecting groove 411 is provided on the fixing portion 41, a right thread hook connecting hole is provided on the sewing machine head 1, the fixing portion connecting groove 411 is aligned with the right thread hook connecting hole, and a fastener is passed through the two. In this embodiment, the right thread hook 4 can be adjusted in position through the fixing portion connecting groove 411, the right thread hook connecting hole, and the fasteners therein, so that the upper thread is close to the thread passing portion 421 of the right thread hook 4 when passing through the right thread hook 4.

[0041] Preferably, Figure 1-Figure 7 As shown, the extension direction of the fixed portion 41 is the same as the radial direction of the clamping piece, the extension direction of the wire passing portion 421 is the same as the axial direction of the clamping piece, and the guide portion 42 is slidably connected to the fixed portion 41. In this embodiment, the radial direction of the clamping piece is the left-right direction, the axial direction of the clamping piece is the front-to-back direction, and the thread take-up lever 5 will swing back and forth during the lifting process. The guide portion 42 is arranged on the left end surface of the fixed portion 41 and can slide in the front-to-back direction. When the guide portion 42 slides in the front-to-back direction, it will cover the motion range of the large clamping surface 7 and the thread take-up lever thread passing hole on the thread take-up lever 5.

[0042] In order to achieve the above purpose or other purposes, the present invention also discloses a sewing machine, including the above-mentioned thread passing mechanism.

[0043] To achieve the above purpose or other purposes, the present invention also discloses a right-thread hook upper thread track, using the above-mentioned sewing machine. A thread passing portion 421 is provided in the guide portion 42, and the thread-accommodating range of the thread passing portion 421 includes the large thread clamping surface 7 and the motion range of the thread passing hole of the thread take-up rod; during the sewing process, when the thread take-up rod 5 drives the upper thread to be in a tight state, the upper thread is closely attached to the thread passing portion 421 of the right thread hook 4 and is in a straight line state in real time; the guide portion 42 follows the upper thread to slide on the fixed portion 41, so that the upper thread is in a low tension position.

[0044] Preferably, Figure 1 , Figure 5-Figure 7 As shown, the upper thread between the large thread clamp 2 and the slow thread hook 3 is the first section upper thread 61, which comes out of the thread clamping piece of the large thread clamp 2, passes through the thread take-up spring and is wound around the slow thread hook 3. The upper thread between the slow thread hook 3 and the right thread hook 4 is the second section upper thread 62, which comes out of the slow thread hook 3 and is wound around the guide part 42 of the right thread hook 4. The upper thread between the right thread hook 4 and the thread passing hole of the thread take-up rod is the third section upper thread 63; the thread accommodating range of the thread passing part 421 includes the movement range of the thread passing hole of the thread take-up rod, and during the sewing process, the extension direction of the second section upper thread 62 and the extension direction of the third section upper thread 63 are in a real-time overlapping state; the thread accommodating range of the thread passing part 421 includes the thread clamping surface 7 of the large thread clamp, and during the sewing process, the angle between the first section upper thread 61 and the thread clamping surface 7 of the large thread clamp changes within a certain range.

[0045] In order to better describe the trajectory of the upper thread of the right thread hook, several trajectories of the upper thread of the right thread hook during sewing are listed according to the different positions of the thread take-up lever 5 and the different positions of the thread passing portion 421 of the right thread hook 4, as shown below:

[0046] 1. The thread hole of the thread take-up rod is located in front of the thread clamping surface 7 of the large thread clamp;

[0047] 1.1, such as Figure 5 As shown in .1, the thread passing portion 421 in the right thread hook 4 is located at the front side of the thread clamping surface 7 of the large thread clamp. When the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the rear end of the thread passing portion 421;

[0048] 1.2, such as Figure 5 As shown in .2, the thread passing portion 421 in the right thread hook 4 includes a large thread clamping surface 7, and when the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the middle portion of the thread passing portion 421;

[0049] 1.3, such as Figure 5 As shown in .3, the thread passing portion 421 in the right thread hook 4 includes a large thread clamping surface 7, and the front end of the thread passing portion 421 is flush with the large thread clamping surface 7; when the surface thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up rod, the surface thread contacts the front end of the thread passing portion 421.

[0050] 2. The thread hole of the thread take-up rod is located directly above the thread clamping surface 7 of the large thread clamp;

[0051] 2.1, such as Figure 6 As shown in .1, the thread passing portion 421 in the right thread hook 4 is located at the front side of the thread clamping surface 7 of the large thread clamp. When the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the rear end of the thread passing portion 421;

[0052] 2.2, such as Figure 6 As shown in .2, the thread passing portion 421 in the right thread hook 4 includes a large thread clamping surface 7, and when the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the middle portion of the thread passing portion 421;

[0053] 2.3, such as Figure 6 As shown in .3, the thread passing portion 421 in the right thread hook 4 is located at the rear side of the thread clamping surface 7 of the large thread clamp. When the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the front end of the thread passing portion 421;

[0054] 3. The thread passing hole of the thread take-up rod is located at the rear side of the thread clamping surface 7 of the large thread clamp;

[0055] 3.1, such as Figure 7 As shown in .1, the thread passing portion 421 in the right thread hook 4 is located at the front side of the thread clamping surface 7 of the large thread clamp. When the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the rear end of the thread passing portion 421;

[0056] 3.2, such as Figure 7 .2, the thread passing portion 421 in the right thread hook 4 includes the large thread clamping surface 7, and the rear end of the thread passing portion 421 is flush with the large thread clamping surface 7; when the upper thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the upper thread contacts the rear end of the thread passing portion 421;

[0057] 3.3, such as Figure 7 As shown in .3, the thread passing portion 421 in the right thread hook 4 includes a large thread clamping surface 7. When the surface thread passes through the right thread hook 4 and enters the thread passing hole of the thread take-up lever, the surface thread contacts the middle portion of the thread passing portion 421.

[0058] From the above nine surface line trajectories, we can know that:

[0059] When the guide portion 42 of the right thread hook 4 does not include the large thread clamping surface 7, when the end (front end or rear end) of the guide portion 42 contacts the upper thread, as shown in FIG. Figure 5 .1. Figure 6 .1. Figure 6 .3. Figure 7 .1; At this time, the spatial angle between the second section of the surface line 62 and the third section of the surface line 63 is larger, and the tension of the surface line is larger when it is tightened; the spatial angle between the first section of the surface line 61 and the clamping surface 7 of the large clamp is larger, the force condition of the large clamp 2 is poor, and the surface line tension in the large clamp 2 is relatively unstable, which is prone to problems such as line throwing and line breaking.

[0060] When the guide portion 42 of the right thread hook 4 includes the large thread clamping surface 7, the middle portion of the guide portion 42 contacts the surface thread, as shown in FIG. Figure 5 .2. Figure 6 .2. Figure 7 .3; At this time, the spatial angle between the second section surface line 62 and the third section surface line 63 is the smallest, and the tension of the surface line here is relatively small.

[0061] When the guide portion 42 of the right thread hook 4 includes a large thread clamping surface 7, when the end (front end or rear end) of the guide portion 42 contacts the upper thread, as shown in FIG. Figure 5 .3. Figure 7 .2; At this time, the spatial angle between the first section surface line 61 and the large clamp surface 7 is the smallest, and the force of the large clamp 2 is the best, but the spatial angle between the second section surface line 62 and the third section surface line 63 is relatively Figure 6 The situation in .2 is more serious, where the tension of the surface thread is greater.

[0062] Preferably, Figure 5 .2. Figure 6 .2. Figure 7 In .3, the first surface line 61, the second surface line 62, and the third surface line 63 are a straight line without any bend in the middle. Figure 5 .2. Figure 6.2. Figure 7 The situation shown in .3 is the optimum situation for the tension of the needle thread. Figure 5 .1. Figure 6 .1. Figure 6 .3. Figure 7 There are angles between the second section surface line 62 and the third section surface line 63 in .1, which may cause line loss and line breakage. Therefore, it should be avoided. Figure 5 .1. Figure 6 .1. Figure 6 .3. Figure 7 .1 situation.

[0063] However, since the position of the thread hole of the thread take-up lever is constantly changing during the actual thread taking-up process of the sewing machine, the thread hole of the thread take-up lever may include the large thread clamping surface 7, or be located in front of and behind the large thread clamping surface 7. Therefore, it is a suboptimal situation to make the first section of the surface thread 61 and the large thread clamping surface 7 in the same plane during the sewing process. Figure 5 .3. Figure 7 .2. Compared to Figure 5 .2. Figure 6 .2. Figure 7 The straight line type shown in .3 also improves the stress condition at the large clamp 2, but because there is a bend between the second section surface line 62 and the third section surface line 63 in the figure, the surface line tension is greater than that of the straight line type, which is more suitable for scenes with extremely thick materials that are greatly affected by the large clamp 2.

[0064] In this embodiment, in the scenario where the large clamp 2 has a greater impact on extremely thick materials, it is necessary to limit the movement range of the thread take-up lever 5 to the same side of the large clamp surface 7, and at the same time limit one end of the guide portion 42 of the right wire hook 4. Figure 5 .3, the thread take-up rod 5 is arranged to move in front of the thread clamping surface 7 of the large thread clamp, and the front end of the guide part 42 of the right thread hook 4 is flush with the thread clamping surface 7 of the large thread clamp, that is, the thread accommodating range of the guide part 42 of the right thread hook 4 covers the thread clamping surface 7 of the large thread clamp (the front end or the rear end is coplanar with the thread clamping surface 7 of the large thread clamp), but the thread accommodating range of the guide part 42 does not include the movement range of the thread take-up rod through the thread hole.

[0065] In addition, the three connection structures between the guide part 42 and the fixed part 41 disclosed in the present application enable the thread-accommodating range of the guide part 42 to include the movement range of the thread clamping surface 7 of the large thread clamp and the thread passing hole of the thread take-up rod 5, which can effectively reduce the spatial angle between the first section of the surface line 61 and the thread clamping surface 7 of the large thread clamp, and between the second section of the surface line 62 and the third section of the surface line 63, improve the stress condition of the large thread clamp 2, improve the stability of the surface line, reduce the tension of the surface line, and thus reduce the occurrence of problems such as line throwing and line breakage.

[0066] The present invention relates to a right thread hook of a sewing machine, a thread passing mechanism, a sewing machine and a surface thread track of the right thread hook. The thread accommodating range of the thread passing portion 421 in the guide portion 42 includes the thread clamping surface 7 of the large thread clamp and the motion range of the thread passing hole of the thread take-up rod. When sewing, the guide portion 42 can follow the surface thread to slide on the fixed portion 41, so that the surface thread is always in a low-tension position, reducing the amplitude of the tension change, reducing the spatial angle between the first section of the surface thread 61 and the thread clamping surface 7 of the large thread clamp, and between the second section of the surface thread 62 and the third section of the surface thread 63, improving the stress condition of the large thread clamp 2, improving the stability of the surface thread, reducing the tension of the surface thread, and reducing the occurrence of problems such as thread throwing and thread breaking.

[0067] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A right thread hook for a sewing machine, characterized in that: The invention comprises a fixing part (41) and a guiding part (42), wherein the guiding part (42) is slidably connected to the fixing part (41), a surface thread is passed through the guiding part (42), and the guiding part (42) can slide on the fixing part (41) following the surface thread, so that the surface thread is in a low tension position.

2. The right thread hook of a sewing machine according to claim 1, characterized in that: A sliding groove is provided on the side of the fixing portion (41), and a sliding block is provided on the side of the guiding portion (42), and the sliding block moves along the extending direction of the sliding groove.

3. The right thread hook of a sewing machine according to claim 1, characterized in that: A through hole or a through groove is provided in the guide portion (42), and the through hole or the through groove is a wire passing portion (421); the surface wire passes through the through hole or the through groove.

4. A thread passing mechanism, mounted on a sewing machine head (1); characterized in that: The thread passing mechanism comprises a large thread clamp (2), a thread take-up lever (5), a thread slowing hook (3), and the right thread hook (4) according to any one of claims 1 to 3; the large thread clamp (2) is provided with two opposite thread clamping pieces, a large thread clamping surface (7) is formed between the two thread clamping pieces, and a thread take-up lever thread passing hole is provided on the thread take-up lever (5); The upper thread passes through the thread clamping surface (7) of the large thread clamp, enters the thread take-up lever (5) through the slow thread hook (3) and the right thread hook (4), and passes through the thread take-up lever thread hole of the thread take-up lever (5).

5. The wire passing mechanism according to claim 4, characterized in that: The fixing part (41) is provided with a fixing part connection groove (411), the sewing machine head (1) is provided with a right thread hook connection hole, the fixing part connection groove (411) is aligned with the right thread hook connection hole, and a fastener is inserted through the two.

6. The wire passing mechanism according to claim 4, characterized in that: The extending direction of the fixing portion (41) is the same as the radial direction of the clamping piece, and the extending direction of the guiding portion (42) is the same as the axial direction of the clamping piece.

7. A sewing machine, characterized in that: Including the wire passing mechanism described in claim 4.

8. A right-line hook surface line trajectory, characterized in that: A sewing machine according to claim 7 is used; a thread passing portion (421) is provided in the guide portion (42), and the thread-accommodating range of the thread passing portion (421) includes the thread clamping surface (7) of the large thread clamp and the motion range of the thread passing hole of the thread take-up lever; During the sewing process, when the thread take-up lever (5) drives the upper thread to be in a taut state, the upper thread is closely attached to the thread passing portion (421) of the right thread hook (4) and is in a straight line state in real time; the guide portion (42) follows the upper thread to slide on the fixing portion (41), so that the upper thread is in a low tension position.

9. The right-line hook surface line track according to claim 8, characterized in that: The surface thread between the large thread clamp (2) and the thread-slowing hook (3) is the first section of the surface thread (61), the surface thread between the thread-slowing hook (3) and the right thread hook (4) is the second section of the surface thread (62), and the surface thread between the right thread hook (4) and the thread passing hole of the thread take-up rod is the third section of the surface thread (63); The thread-carrying range of the thread-passing portion (421) includes the movement range of the thread-passing hole of the thread-taking lever, and during the sewing process, the extension direction of the second section of the upper thread (62) and the extension direction of the third section of the upper thread (63) are in a real-time overlapping state; The thread-accommodating range of the thread-passing portion (421) includes the thread-clamping surface (7) of the large thread clamp. During the sewing process, the angle between the first section of the surface thread (61) and the thread-clamping surface (7) of the large thread clamp changes within a certain range.

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