Needle protection transmission mechanism and splicing machine

Abstract

The utility model relates to a needle protection transmission mechanism and a sewing machine. The needle protection transmission mechanism comprises a curved needle assembly, and the curved needle assembly comprises a curved needle shaft, a curved needle seat fixedly connected to the curved needle shaft and a curved needle fixedly connected to the curved needle seat; the needle protection assembly comprises a needle protection shaft, a needle protection seat rotatably connected to the needle protection shaft in a sliding mode, a protection needle fixedly connected to the needle protection seat and provided with a needle protection face and a first fastener arranged on the needle protection seat, and the first fastener is used for locking the needle protection seat so as to limit the needle protection seat to rotate and slide relative to the needle protection shaft; and the needle protecting shaft is rotatably connected to the curved needle seat so as to axially move along with the curved needle seat, so that the needle protecting surface of the protecting needle axially exceeds the needle point of the curved needle all the time. The protection needle transmission mechanism enables the protection needle assembly and the curved needle assembly to be in transmission connection, when the height of the feed dog is adjusted every time, the position of the protection needle does not change along with the movement position of the feed dog, and the movement amount of the protection needle does not change along with the change of the needle pitch.

Description

Technical Field

[0001] The utility model relates to the technical field of stitching machines, in particular to a needle guard transmission mechanism and a stitching machine. Background Art

[0002] The existing needle guards of sewing machines are all installed on the feed dogs of the sewing machines. The movement trajectory of the feed dogs is elliptical. When the feed dogs move, they will drive the needle guards to move elliptically. Usually, when the curved needle of the sewing machine hooks the thread, the feed dogs move to the right. After the curved needle hooks the thread, the feed dogs are at the rightmost end. At this time, the needle guard should protect the needle of the sewing machine to prevent the needle from being broken when the curved needle hooks the thread.

[0003] The existing needle guard needs to adjust the needle distance or the height of the feed dog after changing the fabric, so that the movement position of the feed dog will change, and the position of the needle guard will also change. At this time, the needle guard cannot accurately protect the needle, and sewing failure occurs. At this time, the needle guard position needs to be adjusted. The existing needle guard structure can only be adjusted left and right. If the height of the feed dog is adjusted, the height of the needle guard will also change. If the needle guard is too high, it will touch the thread loop, and if it is too low, it will not protect the needle.

[0004] The existing needle guard structure can only be adjusted forward and backward because the needle guard is fixedly connected to the feed dog. When the feed dog makes an elliptical feeding motion, the curved needle moves left and right and swings forward and backward. When the needle is at the lowest position, the curved needle is at the front and the feed dog moves to the right. When the needle starts to rise, the curved needle starts to hook the thread backward and the feed dog continues to move to the right. When the curved needle finishes hooking the thread, the feed dog moves to the right limit position and the needle plate starts feeding. The feeding trajectory of the feed dog is the movement trajectory of the needle guard. When the needle distance between the feed dog and the needle is increased, the needle guard increases the needle guard amount. When the needle distance between the feed dog and the needle is decreased, the needle guard decreases the needle guard amount. Too much needle guard amount is easy to wear the needle, and too little needle guard amount is easy to cause needle breakage or skipping. Utility Model Content

[0005] Based on this, it is necessary to provide a needle guard transmission mechanism and a stitching machine to address the problem that the current needle guard structure needs to adjust the needle guard under different needle lengths.

[0006] A needle guard transmission mechanism, comprising:

[0007] A bending needle assembly, the bending needle assembly comprising a bending needle shaft, a bending needle seat fixedly connected to the bending needle shaft, and a bending needle fixedly connected to the bending needle seat; and

[0008] A needle guard assembly, which includes a needle guard shaft, a needle guard seat rotatably slidably connected to the needle guard shaft, a needle guard fixed to the needle guard seat and having a needle guard surface, and a first fastener arranged on the needle guard seat, wherein the first fastener is used to lock the needle guard seat to limit the rotation and sliding of the needle guard seat relative to the needle guard shaft, and the needle guard shaft is rotatably connected to the curved needle seat to move axially with the curved needle seat so that the needle guard surface of the needle guard always axially exceeds the needle tip of the curved needle.

[0009] In one embodiment, the needle guard shaft includes a needle guard shaft body and a limiting ring body arranged around the needle guard shaft body, the bending needle seat includes a first fixing part and a second fixing part connected to the first fixing part, the second fixing part has a bending needle shaft hole, the bending needle shaft is inserted into the bending needle shaft hole, the first fixing part has a matching groove, and the limiting ring body is partially embedded in the matching groove, so as to drive the needle guard seat to move axially when the bending needle shaft drives the bending needle seat to move axially.

[0010] In one of the embodiments, the first fixing portion has a avoidance groove connected to the matching groove, the avoidance groove is located on a side of the matching groove close to the needle guard seat, and the needle guard shaft body is partially embedded in the avoidance groove.

[0011] In one embodiment, the first fixing portion has a receiving hole connected to the matching groove, the receiving hole is located on the side of the matching groove away from the needle guard seat, and one end of the needle guard shaft body close to the curved needle seat is inserted into the receiving hole.

[0012] In one embodiment, the needle guard seat includes a first mounting portion, the first mounting portion has a first mounting hole and a first fastening hole connected to the first mounting hole, the first mounting portion is rotatably and slidably connected to the needle guard shaft through the first mounting hole, and the first fastener is adjustably arranged in the first fastening hole, wherein, when the first fastener is in a locked state, the first fastener abuts against the needle guard shaft to limit the first mounting portion from rotating and sliding relative to the needle guard shaft; when the first fastener is in an unlocked state, the first fastener is separated from the needle guard shaft to allow the first mounting portion to rotate and slide relative to the needle guard shaft.

[0013] In one embodiment, the needle guard seat further includes a second mounting portion connected to the first mounting portion, the second mounting portion having a second mounting hole and a second fastening hole connected to the second mounting hole; the needle guard includes a connecting portion inserted in the second mounting hole and a needle guard body connected to the connecting portion; the needle guard assembly further includes a second fastener, the second fastener is arranged in the second fastening hole to fix the connecting portion to the second mounting hole.

[0014] In one embodiment, the opening of the first fastening hole and the opening of the second fastening hole face the same direction.

[0015] In one embodiment, the needle guard assembly further includes a limiting member, the limiting member has a limiting groove, the needle guard shaft includes a limiting portion, the limiting portion is located at an end of the needle guard shaft away from the bending needle seat, and the limiting portion is slidably disposed in the limiting groove to limit the circumferential swing of the needle guard shaft.

[0016] In one of the embodiments, the limiting groove has two limiting surfaces arranged in parallel, and the limiting portion has two matching surfaces arranged in parallel. When the limiting portion is inserted into the limiting groove, the matching surfaces are respectively limited and matched with the limiting surfaces.

[0017] A stitching machine, comprising:

[0018] A stitching machine body, wherein the stitching machine body has an adjustment port;

[0019] As in any one of the above-mentioned needle guard transmission mechanisms, the needle guard transmission mechanism is installed on the stitching machine body, and the needle guard transmission mechanism is exposed to the adjustment port.

[0020] The above-mentioned needle guard transmission mechanism is different from the traditional structure where the needle guard assembly is fixed to the feed dog. The needle guard assembly is connected to the bending needle assembly through transmission. Each time the height of the feed dog is adjusted, the position of the needle guard does not change with the movement position of the feed dog. The needle guard can adjust the needle guard amount independently. Because the movement amount of the bending needle does not change, the movement amount of the needle guard also does not change, that is, the movement amount of the needle guard does not change due to the change of the needle length, thereby avoiding the problem of excessive needle guard amount causing needle wear or too small needle guard amount causing needle breakage and skipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional schematic diagram of a stitching machine provided for one embodiment of the present application;

[0022] Figure 2 A three-dimensional schematic diagram of a needle guard transmission mechanism provided in one embodiment of the present application;

[0023] Figure 3 A schematic top view of the needle guard transmission mechanism according to the above embodiment of the present application is shown;

[0024] Figure 4 An exploded schematic diagram of the needle guard transmission mechanism according to the above embodiment of the present application is shown;

[0025] Figure 5 A schematic circumferential cross-sectional view of the needle guard transmission mechanism according to the above embodiment of the present application is shown;

[0026] Figure 6 An axial cross-sectional schematic diagram of the needle guard transmission mechanism according to the above embodiment of the present application is shown;

[0027] Figure 7 An exploded schematic diagram of a needle guard assembly of a needle guard transmission mechanism according to the above embodiment of the present application is shown;

[0028] Figure 8 A schematic diagram of an exploded view of the bent needle assembly of the needle guard transmission mechanism according to the above embodiment of the present application is shown.

[0029] Figure numerals: 10, bending needle assembly; 11, bending needle shaft; 12, bending needle seat; 121, first fixing portion; 122, second fixing portion; 123, bending needle shaft hole; 124, matching groove; 125, avoidance groove; 126, accommodating hole; 128, adjustment opening; 129, third fastening hole; 13, bending needle; 14, third fastening member; 20, needle guard assembly; 21, needle guard shaft; 211, needle guard shaft body; 212, limiting ring body; 213, limiting portion; 214, Matching surface; 22, needle guard seat; 221, first mounting part; 222, first mounting hole; 223, first fastening hole; 224, second mounting part; 225, second mounting hole; 226, second fastening hole; 23, needle guard; 231, needle guard surface; 232, connecting part; 233, needle guard body; 24, first fastener; 25, second fastener; 26, limiter; 261, limit groove; 262, limit surface; 30, stitching machine body; 31, adjustment port. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] In view of the problem that the current existing needle guard structure needs to adjust the needle guard 23 under different needle lengths, the present application provides a needle guard transmission mechanism and a stitching machine.

[0037] For details, please refer to Figure 1 , Figure 2 and Figure 3The needle guard transmission mechanism may include a bend needle assembly 10 and a needle guard assembly 20. The bend needle assembly 10 includes a bend needle shaft 11, a bend needle seat 12 and a bend needle 13. The bend needle seat 12 is fixed to the bend needle shaft 11, and the bend needle 13 is fixed to the bend needle seat 12. The bend needle 13 can drive the bend needle seat 12 to rotate circumferentially through the bend needle shaft 11 to achieve forward and backward swinging, and drive the bend needle seat 12 to move axially through the bend needle shaft 11 to achieve left and right movement, so that the bend needle 13 can achieve the function of hooking the thread.

[0038] The needle guard assembly 20 includes a needle guard shaft 21, a needle guard seat 22, a needle guard 23 and a first fastener 24. The needle guard 23 is fixedly connected to the needle guard seat 22, the needle guard seat 22 is rotatably slidably connected to the needle guard shaft 21, and the first fastener 24 is adjustably connected to the needle guard seat 22, and is used to lock the needle guard seat 22 to limit the rotation and sliding of the needle guard seat 22 relative to the needle guard shaft 21. By adjusting the first fastener 24, the needle guard seat 22 can rotate and slide relative to the needle guard shaft 21, and the effect of adjusting the left and right position and angle of the needle guard 23 can be achieved.

[0039] The needle guard shaft 21 is rotatably connected to the needle bending seat 12 so as to move axially with the needle bending seat 12, so that the needle guard surface 231 of the needle guard 23 always axially exceeds the needle tip of the needle bending 13. In other words, the needle tip of the needle bending 13 is always located on the side of the needle guard surface 231 of the needle guard 23 away from the machine needle. When the needle bending seat 12 is driven by the needle bending shaft 11 to move axially, the needle bending seat 12 can drive the needle guard shaft 21 to move axially, and when the needle bending seat 12 is driven by the needle bending shaft 11 to rotate circumferentially, the needle guard shaft 21 will not be driven to rotate by the needle bending seat 12. In this way, when the needle bending 13 hooks the thread, the needle guard 23 will maintain synchronous axial movement with the needle bending 13, so that the needle guard 23 can always push the needle bending 13 away to prevent the needle bending 13 from hitting the machine needle.

[0040] It can be understood that the needle guard transmission mechanism is different from the traditional structure in which the needle guard assembly 20 is fixed to the feed dog. The needle guard assembly 20 is connected to the bending needle assembly 10 in a transmission manner. Each time the height of the feed dog is adjusted, the position of the needle guard 23 does not change with the movement position of the feed dog. The needle guard 23 can adjust the needle guard amount independently. Because the movement amount of the bending needle 13 does not change, the movement amount of the needle guard 23 also does not change, that is, the movement amount of the needle guard 23 does not change due to the change of the needle distance, thereby avoiding the problem of excessive needle guard amount causing needle wear or too small needle guard amount causing needle breakage and skipping.

[0041] More specifically, if Figure 4 and Figure 6As shown, in one embodiment, the needle guard shaft 21 includes a needle guard shaft body 211 and a limiting ring body 212 arranged on the needle guard shaft body 211, the needle bending seat 12 includes a first fixed portion 121 and a second fixed portion 122 connected to the first fixed portion 121, the second fixed portion 122 has a needle bending shaft hole 123, the needle bending shaft 11 is inserted into the needle bending shaft hole 123, the first fixed portion 121 has a matching groove 124, and the limiting ring body 212 is partially embedded in the matching groove 124, so as to drive the needle guard seat 22 to move axially when the needle bending shaft 11 drives the needle bending seat 12 to move axially. In this arrangement, when the curved needle shaft 11 drives the second fixed part 122 to move axially, the first fixed part 121 drives the needle guard shaft 211 to move axially synchronously through the limiting ring body 212, thereby driving the needle guard seat 22 to move axially, so that the needle guard surface 231 of the needle guard 23 always exceeds the needle tip of the curved needle 13.

[0042] Preferably, if Figure 4 and Figure 6 As shown, in one embodiment, the first fixing portion 121 has an avoidance groove 125 connected to the matching groove 124, the avoidance groove 125 is located on the side of the matching groove 124 close to the needle guard seat 22, and the needle guard shaft body 211 is partially embedded in the avoidance groove 125. Such a configuration can make the limiting ring body 212 more embedded in the matching groove 124, increase the contact area between the first fixing portion 121 and the limiting ring body 212, thereby increasing the force bearing area of ​​the limiting ring body 212, so that the curved needle seat 12 can more smoothly drive the needle guard shaft 21 to move axially.

[0043] Preferably, if Figure 4 and Figure 6 As shown, in one embodiment, the first fixing portion 121 has a receiving hole 126 connected to the matching groove 124, the receiving hole 126 is located on the side of the matching groove 124 away from the needle guard seat 22, and the end of the needle guard shaft 211 close to the curved needle seat 12 is inserted into the receiving hole 126. Such a configuration can make the matching of the needle guard shaft 21 and the curved needle seat 12 more compact and reduce space occupation.

[0044] Alternatively, if Figure 8 As shown, in one embodiment, the second fixing portion 122 is provided with an adjustment opening 128 connected to the bending needle shaft hole 123 and a third fastening hole 129 penetrating the adjustment opening 128 from the side, and the bending needle assembly 10 further includes a third fastener 14, and the third fastener 14 is arranged in the third fastening hole 129. By adjusting the third fastener 14, the size of the adjustment opening 128 can be adjusted, thereby adjusting the tightness of the bending needle shaft hole 123, so that the second fixing portion 122 clamps the bending needle shaft 11.

[0045] For example, the third fastening hole 129 can be implemented as a threaded hole, and the third fastening member 14 can be implemented as a bolt accordingly. The third fastening hole 129 can be implemented as a through hole, and the third fastening member 14 can be implemented as a bolt and a nut accordingly.

[0046] Furthermore, if Figure 4 and Figure 5 As shown, in one embodiment, the needle guard seat 22 includes a first mounting portion 221, the first mounting portion 221 having a first mounting hole 222 and a first fastening hole 223 connected to the first mounting hole 222, the first mounting portion 221 is rotatably and slidably connected to the needle guard shaft 21 through the first mounting hole 222, and the first fastener 24 is adjustably arranged in the first fastening hole 223, wherein when the first fastener 24 is in a locked state, the first fastener 24 abuts against the needle guard shaft 21 to limit the first mounting portion 221 from rotating and sliding relative to the needle guard shaft 21; when the first fastener 24 is in an unlocked state, the first fastener 24 is separated from the needle guard shaft 21 to allow the first mounting portion 221 to rotate and slide relative to the needle guard shaft 21. In this way, by controlling the tightness of the first fastener 24, the relative rotation and sliding of the needle guard seat 22 and the needle guard shaft 21 can be controlled, and the needle guard 23 can be adjusted in multiple dimensions such as front and back, up and down, rotation, and tilt.

[0047] For example, the first fastening member 24 may be implemented as a bolt, and the first fastening hole 223 may be implemented as a threaded hole.

[0048] Alternatively, if Figure 5 and Figure 7 As shown, in one embodiment, the needle guard seat 22 further includes a second mounting portion 224 connected to the first mounting portion 221, and the second mounting portion 224 has a second mounting hole 225 and a second fastening hole 226 connected to the second mounting hole 225; the needle guard 23 includes a connecting portion 232 inserted in the second mounting hole 225 and a needle guard body 233 connected to the connecting portion 232; the needle guard assembly 20 further includes a second fastener 25, and the second fastener 25 is arranged in the second fastening hole 226 to fix the connecting portion 232 to the second mounting hole 225. In this way, by loosening the second fastener 25, the length of the connecting portion 232 inserted in the second mounting hole 225 is adjusted, so that the height of the needle guard 23 can be adjusted.

[0049] For example, the second fastening member 25 may be implemented as a bolt, and the second fastening hole 226 may be implemented as a threaded hole.

[0050] Preferably, if Figure 7As shown, in one embodiment, the opening of the first fastening hole 223 and the opening of the second fastening hole 226 face the same direction. This arrangement facilitates the use of tools such as screwdrivers to operate the first fastener 24 and the second fastener 25, and facilitates the adjustment of the angle, position and height of the needle guard 23.

[0051] In particular, if Figure 4 and Figure 6 As shown, in one embodiment, the needle guard assembly 20 further includes a limiting member 26, the limiting member 26 has a limiting groove 261, the needle guard shaft 21 includes a limiting portion 213, the limiting portion 213 is located at one end of the needle guard shaft 21 away from the bending needle seat 12, the limiting portion 213 is slidably arranged in the limiting groove 261, when the bending needle seat 12 makes circumferential rotation and axial movement, through the cooperation between the limiting groove 261 and the limiting portion 213, the limiting portion 213 can only slide along the limiting groove 261, but cannot rotate, thereby limiting the circumferential swing of the needle guard shaft 21, so that the bending needle seat 12 can drive the needle guard shaft 21 to move axially.

[0052] Optionally, in one embodiment, the limiting groove 261 and the limiting portion 213 can cooperate in a variety of ways, and the rotation of the needle guard shaft 21 can be limited by the cooperation of multiple limiting surfaces 262 of the limiting groove 261 and multiple matching surfaces 214 of the limiting portion 213.

[0053] Preferably, if Figure 4 and Figure 6 As shown, in one embodiment, the limiting groove 261 has two limiting surfaces 262 arranged in parallel, and the limiting portion 213 has two matching surfaces 214 arranged in parallel. When the limiting portion 213 is inserted into the limiting groove 261, the matching surfaces 214 are respectively limited and matched with the limiting surfaces 262. With such a configuration, the limiting groove 261 and the limiting portion 213 have simple structures and are easy to process.

[0054] Furthermore, if Figure 1 As shown, the present application also provides a stitching machine, which may include a stitching machine body 30 and a needle guard transmission mechanism as described above, wherein the stitching machine body 30 has an adjustment port 31, and the adjustment port 31 is used to allow tools such as a screwdriver to extend into the stitching machine. The needle guard transmission mechanism is installed on the stitching machine body 30, and the first fastener 24 of the needle guard transmission mechanism is exposed to the adjustment port 31. In this way, the first fastener 24 is externally placed, which is more convenient to adjust and has a wider adjustment range, and can be applied to a variety of process scenarios.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A needle guard transmission mechanism, characterized in that: include: A bending needle assembly, the bending needle assembly comprising a bending needle shaft, a bending needle seat fixedly connected to the bending needle shaft, and a bending needle fixedly connected to the bending needle seat; and A needle guard assembly, which includes a needle guard shaft, a needle guard seat rotatably slidably connected to the needle guard shaft, a needle guard fixed to the needle guard seat and having a needle guard surface, and a first fastener arranged on the needle guard seat, wherein the first fastener is used to lock the needle guard seat to limit the rotation and sliding of the needle guard seat relative to the needle guard shaft, and the needle guard shaft is rotatably connected to the curved needle seat to move axially with the curved needle seat so that the needle guard surface of the needle guard always axially exceeds the needle tip of the curved needle.

2. The needle guard transmission mechanism according to claim 1, characterized in that: The needle guard shaft includes a needle guard shaft body and a limiting ring body arranged around the needle guard shaft body, the bending needle seat includes a first fixing part and a second fixing part connected to the first fixing part, the second fixing part has a bending needle shaft hole, the bending needle shaft is inserted into the bending needle shaft hole, the first fixing part has a matching groove, and the limiting ring body is partially embedded in the matching groove to drive the needle guard seat to move axially when the bending needle shaft drives the bending needle seat to move axially.

3. The needle guard transmission mechanism according to claim 2, characterized in that: The first fixing portion has an escape groove connected to the matching groove, the escape groove is located on a side of the matching groove close to the needle guard seat, and the needle guard shaft body is partially embedded in the escape groove.

4. The needle guard transmission mechanism according to claim 2, characterized in that: The first fixing portion has a receiving hole connected to the matching groove, the receiving hole is located on a side of the matching groove away from the needle guard seat, and one end of the needle guard shaft body close to the curved needle seat is inserted into the receiving hole.

5. The needle guard transmission mechanism according to any one of claims 1 to 4, characterized in that: The needle guard seat includes a first mounting portion, the first mounting portion having a first mounting hole and a first fastening hole connected to the first mounting hole, the first mounting portion is rotatably and slidably connected to the needle guard shaft through the first mounting hole, and the first fastener is adjustably arranged in the first fastening hole, wherein, when the first fastener is in a locked state, the first fastener abuts against the needle guard shaft to limit the rotation and sliding of the first mounting portion relative to the needle guard shaft; when the first fastener is in an unlocked state, the first fastener is separated from the needle guard shaft to allow the first mounting portion to rotate and slide relative to the needle guard shaft.

6. The needle guard transmission mechanism according to claim 5, characterized in that: The needle guard seat further includes a second mounting portion connected to the first mounting portion, the second mounting portion having a second mounting hole and a second fastening hole connected to the second mounting hole; the needle guard includes a connecting portion inserted in the second mounting hole and a needle guard body connected to the connecting portion; the needle guard assembly further includes a second fastener, the second fastener is arranged in the second fastening hole to fix the connecting portion to the second mounting hole.

7. The needle guard transmission mechanism according to claim 6, characterized in that: The opening of the first fastening hole and the opening of the second fastening hole face the same direction.

8. The needle guard transmission mechanism according to any one of claims 1 to 4, characterized in that: The needle guard assembly further includes a limiting member, which has a limiting groove. The needle guard shaft includes a limiting portion, which is located at an end of the needle guard shaft away from the curved needle seat. The limiting portion is slidably disposed in the limiting groove to limit the circumferential swing of the needle guard shaft.

9. The needle guard transmission mechanism according to claim 8, characterized in that: The limiting groove has two limiting surfaces arranged in parallel, and the limiting portion has two matching surfaces arranged in parallel. When the limiting portion is inserted into the limiting groove, the matching surfaces are respectively limited and matched with the limiting surfaces.

10. A stitching machine, characterized in that: include: A stitching machine body, wherein the stitching machine body has an adjustment port; The needle guard transmission mechanism according to any one of claims 1 to 9, wherein the needle guard transmission mechanism is installed on the stitching machine body, and the needle guard transmission mechanism is exposed to the adjustment port.

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