Auxiliary threading mechanism of sewing machine

Abstract

The utility model discloses an auxiliary threading mechanism of a sewing machine, which comprises a sewing machine shell, a guide hook, a guide plate, a take-up lever and a guide slider, the guide hook, the guide plate and the take-up lever are arranged on the sewing machine shell, the lower end of the guide plate is provided with a guide tip protruding out of the sewing machine shell, and the guide slider is slidably arranged on the outer surface of the sewing machine shell. The outer surface of the sewing machine shell is provided with an identification path for indicating the movement direction of the guide sliding block, the guide sliding block is provided with a connecting part, during threading, one end of a sewing thread is connected with the connecting part, and the guide sliding block is moved to drive the connecting part to sequentially pass through the guide plate, the guide tip part and the take-up lever along the identification path; the sewing upper thread threading device can assist an operator in correctly threading the sewing upper thread. The sewing upper thread threading device has the advantages that the sewing upper thread can be sequentially wound on the guide tip part and the thread take-up lever.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and particularly relates to an auxiliary threading mechanism for sewing machines. Background Art

[0002] A sewing machine is a mechanical device for sewing clothes. A sewing head and a transmission mechanism are arranged on the sewing machine. The sewing head has a sewing machine housing and a guide hook, a guide plate, a thread take-up lever and a sewing needle arranged on the sewing machine housing. The lower end of the guide plate has a guide tip protruding outside the sewing machine housing. During use, an operator needs to wind the sewing upper thread around the guide hook, the guide plate, the guide tip and the thread take-up lever in sequence, and finally thread the sewing upper thread through the needle hole of the sewing needle. After completing the threading operation, sewing work can be carried out.

[0003] However, during the actual threading process, the operator is prone to missing the two parts of the guide tip and the thread take-up lever, resulting in the sewing upper thread not passing through the guide tip and the thread take-up lever, incorrect threading, and inability to perform sewing work normally. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides an auxiliary threading mechanism for sewing machines, which can assist the operator to correctly thread the sewing upper thread.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An auxiliary threading mechanism for sewing machines includes a sewing machine housing, and a guide hook, a guide plate, a thread take-up lever and a guiding slider arranged on the sewing machine housing. The lower end of the guide plate has a guide tip protruding outside the sewing machine housing. The guiding slider is slidably arranged on the outer surface of the sewing machine housing. A marking path for indicating the movement direction of the guiding slider is arranged on the outer surface of the sewing machine housing. A connecting part is arranged on the guiding slider. During threading, one end of the sewing upper thread is connected to the connecting part, and the guiding slider is moved to drive the connecting part to sequentially pass through the guide plate, the guide tip and the thread take-up lever along the marking path, and the connecting part is made to drag the sewing upper thread to wind around the guide tip and the thread take-up lever in sequence.

[0007] By arranging the guiding slider, the guiding slider is slidably arranged on the outer surface of the sewing machine housing, a connecting part is arranged on the guiding slider, and a marking path for indicating the movement direction of the guiding slider is arranged on the outer surface of the sewing machine housing. During threading, the operator first winds the sewing upper thread around the guide hook, then connects one end of the sewing upper thread to the connecting part, and then moves the guiding slider according to the indication of the marking path to drive the connecting part to sequentially pass through the guide plate, the guide tip and the thread take-up lever along the marking path, so that the connecting part drags the sewing upper thread to wind around the guide tip and the thread take-up lever in sequence, achieving the purpose of assisting the operator to correctly thread the sewing upper thread.

[0008] As a preferred solution, the sewing machine housing has a non-magnetic front cover, the identification path is provided on the outer surface of the non-magnetic front cover, the guiding slider is magnetically connected to the non-magnetic front cover through a magnetic attraction assembly, and the guiding slider is slidably arranged on the outer surface of the non-magnetic front cover through the magnetic attraction assembly.

[0009] As a preferred solution, the guiding slider is magnetically connected to the non-magnetic front cover through a magnetic attraction assembly. The magnetic attraction assembly includes a first magnetic member and a second magnetic member. The first magnetic member is arranged on the guiding slider, and the second magnetic member is movably arranged on the non-magnetic front cover. When the guiding slider drives the first magnetic member to move, the first magnetic member drives the second magnetic member to move.

[0010] As a preferred solution, the magnetic attraction assembly further includes a third magnetic member and a fourth magnetic member. The third magnetic member is arranged on the guiding slider, and the fourth magnetic member is movably arranged on the non-magnetic front cover. When the guiding slider drives the third magnetic member to move, the third magnetic member drives the fourth magnetic member to move. The first magnetic member, the second magnetic member, the third magnetic member, and the fourth magnetic member are all magnets, and the magnetic pole of the end of the first magnetic member close to the second magnetic member is opposite to the magnetic pole of the end of the third magnetic member close to the fourth magnetic member.

[0011] As a preferred solution, a movable groove is provided on the inner surface of the non-magnetic front cover. The movable groove faces the identification path, and the extending direction of the movable groove is the same as the extending direction of the identification path. The second magnetic member is movably arranged in the movable groove.

[0012] As a preferred solution, an opening is provided on one side of the movable groove away from the identification path, and a cover plate for restricting the second magnetic member from disengaging from the movable groove is provided at the opening. The second magnetic member can be magnetically connected to the cover plate, and the magnetic attraction force between the first magnetic member and the second magnetic member > the magnetic attraction force between the second magnetic member and the cover plate.

[0013] As a preferred solution, the connecting portion is a thread clamping portion. The thread clamping portion includes a connecting rod and a sleeve. The connecting rod is installed on the guiding slider, and the sleeve is movably sleeved outside the connecting rod along the axial direction of the connecting rod. A through hole for the sewing upper thread to pass through is provided at one end of the connecting rod close to the sewing machine housing, and the sleeve can clamp the sewing upper thread in the through hole.

[0014] As a preferred solution, an external thread is provided on the outer circumferential surface of the connecting rod, and an internal thread is provided on the inner circumferential surface of the sleeve. The internal thread is matched with the external thread so that the sleeve is threadedly connected to the connecting rod.

[0015] As a preferred solution, the identification path has a first identification segment, a second identification segment, a third identification segment, and a fourth identification segment that are connected in sequence from start to end. The first identification segment and the third identification segment both extend downward along the outer surface of the sewing machine housing, and the second identification segment and the fourth identification segment both extend from left to right along the outer surface of the sewing machine housing.

[0016] As a preferred solution, the identification path is an identification line silk-screened on the outer surface of the sewing machine housing.

[0017] Compared with the prior art, the present utility model has obvious advantages and beneficial effects. Specifically, by providing a guiding slider that is slidably arranged on the outer surface of the sewing machine housing, a connecting portion is provided on the guiding slider, and an identification path for indicating the movement direction of the guiding slider is provided on the outer surface of the sewing machine housing. When threading, the operator first passes the upper sewing thread around the guiding hook, then connects one end of the upper sewing thread to the connecting portion, and then moves the guiding slider according to the indication of the identification path, so that the guiding slider drives the connecting portion to sequentially pass through the guiding plate, the guiding tip, and the thread take-up lever along the identification path, thereby enabling the connecting portion to drag the upper sewing thread to wind around the guiding tip and the thread take-up lever in sequence, achieving the purpose of assisting the operator to correctly thread the upper sewing thread.

[0018] To more clearly illustrate the structural features, technical means, and specific purposes and functions achieved by the present utility model, the following further detailed description of the present utility model will be given in conjunction with the accompanying drawings and specific embodiments: Description of the Drawings

[0019] Figure 1 is the schematic assembly structure diagram of the embodiment of the present utility model;

[0020] Figure 2 is the schematic assembly diagram of the guiding slider, non-magnetic front cover, and cover plate of the embodiment of the present utility model;

[0021] Figure 3 is Figure 2 the cross-sectional schematic diagram of;

[0022] Figure 4 is Figure 2 the exploded schematic diagram of;

[0023] Figure 5 is the schematic structure diagram of the guiding slider of the embodiment of the present utility model;

[0024] Figure 6 is the schematic diagram of the first use state of the embodiment of the present utility model;

[0025] Figure 7 is the schematic diagram of the second use state of the embodiment of the present utility model;

[0026] Figure 8It is a schematic diagram of the third usage state of an embodiment of the present utility model.

[0027] Explanation of the attached drawing reference numerals:

[0028] 10 - Sewing machine housing; 11 - Guide hook; 12 - Guide plate; 121 - Guide tip; 13 - Thread take-up lever; 14 - Marking path; 141 - First marking section; 142 - Second marking section; 143 - Third marking section; 144 - Fourth marking section; 145 - Fifth marking section; 15 - Non-magnetic front cover; 16 - Movable groove; 161 - Opening; 17 - Cover plate; 18 - Needle; 20 - Guide slider; 21 - Connecting part; 211 - Link; 212 - Sleeve; 213 - Through hole; 22 - Magnetic attraction assembly; 221 - First magnetic part; 222 - Second magnetic part; 223 - Third magnetic part; 224 - Fourth magnetic part; 30 - Sewing upper thread. Detailed implementation manners

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] As Figure 1-8 shown, the present utility model discloses an auxiliary thread threading mechanism for a sewing machine, including a sewing machine housing 10, and a guide hook 11, a guide plate 12, a thread take-up lever 13, and a guide slider 20 provided on the sewing machine housing 10. The lower end of the guide plate 12 has a guide tip 121 protruding outside the sewing machine housing 10.

[0032] The guiding slider 20 is slidably arranged on the outer surface of the sewing machine housing 10. A marking path 14 indicating the moving direction of the guiding slider 20 is provided on the outer surface of the sewing machine housing 10. A connecting portion 21 is provided on the guiding slider 20. When threading, one end of the upper sewing thread 30 is connected to the connecting portion 21. The guiding slider 20 is moved to drive the connecting portion 21 to sequentially pass through the guiding plate 12, the guiding tip 121 and the thread take-up lever 13 along the marking path 14, and the connecting portion 21 drags the upper sewing thread 30 to sequentially wind around the guiding tip 121 and the thread take-up lever 13.

[0033] The sewing machine housing 10 has a non-magnetic front cover 15. The marking path 14 is provided on the outer surface of the non-magnetic front cover 15. The guiding slider 20 is magnetically connected to the non-magnetic front cover 15 through a magnetic attraction assembly 22, and the guiding slider 20 is slidably arranged on the outer surface of the non-magnetic front cover 15 through the magnetic attraction assembly 22. By providing the non-magnetic front cover 15, the guiding slider 20 is magnetically connected to the non-magnetic front cover 15 through the magnetic attraction assembly 22, and the guiding slider 20 is slidably arranged on the outer surface of the non-magnetic front cover 15 through the magnetic attraction assembly 22. By adopting the magnetic attraction method, the guiding slider 20 can be adsorbed on the outer surface of the non-magnetic front cover 15, which is convenient for the assembly of the guiding slider 20 and also convenient for the movement of the guiding slider 20 on the outer surface of the non-magnetic front cover 15.

[0034] The guiding slider 20 is magnetically connected to the non-magnetic front cover 15 through a magnetic attraction assembly 22. The magnetic attraction assembly 22 includes a first magnetic member 221 and a second magnetic member 222. The first magnetic member 221 is arranged on the guiding slider 20, and the second magnetic member 222 is movably arranged on the non-magnetic front cover 15. When the guiding slider 20 drives the first magnetic member 221 to move, the first magnetic member 221 drives the second magnetic member 222 to move.

[0035] The magnetic attraction component 22 further includes a third magnetic member 223 and a fourth magnetic member 224. The third magnetic member 223 is disposed on the guiding slider 20. The fourth magnetic member 224 is movably disposed on the non-magnetic front cover 15. When the guiding slider 20 drives the third magnetic member 223 to move, the third magnetic member 223 drives the fourth magnetic member 224 to move. The first magnetic member 221, the second magnetic member 222, the third magnetic member 223, and the fourth magnetic member 224 are all magnets. The magnetic pole of the end of the first magnetic member 221 close to the second magnetic member 222 is opposite to the magnetic pole of the end of the third magnetic member 223 close to the fourth magnetic member 224. By setting the magnetic pole of the end of the first magnetic member 221 close to the second magnetic member 222 to be opposite to the magnetic pole of the end of the third magnetic member 223 close to the fourth magnetic member 224, if the installation direction of the guiding slider 20 is incorrect, due to the mutual repulsion between the first magnetic member 221 and the fourth magnetic member 224, and the mutual repulsion between the second magnetic member 222 and the third magnetic member 223, the guiding slider 20 cannot be adsorbed on the non-magnetic front cover 15, thus playing an anti-fooling role and preventing the installation direction of the guiding slider 20 from being incorrect.

[0036] An activity groove 16 is provided on the inner surface of the non-magnetic front cover 15. The activity groove 16 faces the marking path 14, and the extending direction of the activity groove 16 is the same as the extending direction of the marking path 14. The second magnetic member 222 and the fourth magnetic member 224 are both movably disposed in the activity groove 16.

[0037] A cover plate 17 for restricting the second magnetic member 222 and the fourth magnetic member 224 from detaching from the activity groove 16 is provided on one side of the activity groove 16 away from the marking path 14. The cover plate 17 is detachably connected to the non-magnetic front cover 15 by screws. The second magnetic member 222 and the fourth magnetic member 224 can both be magnetically connected to the cover plate 17. The magnetic attraction force between the first magnetic member 221 and the second magnetic member 222 > the magnetic attraction force between the second magnetic member 222 and the cover plate 17. Similarly, the magnetic attraction force between the third magnetic member 223 and the fourth magnetic member 224 > the magnetic attraction force between the fourth magnetic member 224 and the cover plate 17. By providing the cover plate 17 at the opening 161 of the activity groove 16, and the magnetic attraction force between the first magnetic member 221 and the second magnetic member 222 > the magnetic attraction force between the second magnetic member 222 and the cover plate 17, when the guiding slider 20 moves along the marking path 14, the mutual attraction between the first magnetic member 221 and the second magnetic member 222 will cause the second magnetic member 222 to disengage from the cover plate 17. At this time, there is a small gap between the second magnetic member 222 and the cover plate 17. If the guiding slider 20 is taken away or falls off due to human factors or bumps, the second magnetic member 222 will be attracted to the cover plate 17 to prevent the second magnetic member 222 from slipping.

[0038] The cover plate 17 is formed of a weakly magnetic material. In addition, the cover plate 17 can also be an iron plate, and a non-magnetic coating is provided on the side of the iron plate facing the movable slot 16 to isolate the second magnetic member 222 from the iron plate, so that the magnetic attraction force between the first magnetic member 221 and the second magnetic member 222 > the magnetic attraction force between the second magnetic member 222 and the cover plate 17.

[0039] The connecting portion 21 is a wire clamping portion, and the wire clamping portion includes a connecting rod 211 and a sleeve 212. The connecting rod 211 is installed on the guiding slider 20, and the sleeve 212 is movably sleeved outside the connecting rod 211 along the axial direction of the connecting rod 211. A through hole 213 for the sewing upper thread 30 to pass through is provided at one end of the connecting rod 211 close to the sewing machine housing 10, and the sleeve 212 can clamp the sewing upper thread 30 in the through hole 213; by providing the connecting portion 21 composed of the connecting rod 211 and the sleeve 212. A through hole 213 is provided on the connecting rod 211, and the sewing upper thread 30 passes through the through hole 213, and then moving the sleeve 212 can make the sleeve 212 clamp the sewing upper thread 30 in the through hole 213. The clamping method is simple and easy to operate.

[0040] The outer circumferential surface of the connecting rod 211 is provided with an external thread, and the inner circumferential surface of the sleeve 212 is provided with an internal thread, and the internal thread is matched with the external thread so that the sleeve 212 is threadedly connected to the connecting rod 211; adopting a threaded connection method, rotating the sleeve 212 forward to make the sleeve 212 move in the direction close to the through hole 213 can clamp the sewing upper thread 30 in the through hole 213, and rotating the sleeve 212 in the reverse direction to make the sleeve 212 move away from the through hole 213 can loosen the sewing upper thread 30; easy to operate.

[0041] The marking path 14 has a first marking segment 141, a second marking segment 142, a third marking segment 143, a fourth marking segment 144, and a fifth marking segment 145 that are connected in sequence from head to tail. The first marking segment 141, the third marking segment 143, and the fifth marking segment 145 all extend downward along the outer surface of the sewing machine housing 10, and the second marking segment 142 and the fourth marking segment 144 both extend along the outer surface of the sewing machine housing 10 from left to right. Specifically, the fourth marking segment 144 is provided on the upper surface of the sewing machine housing 10; by providing the marking path 14 composed of the first marking segment 141, the second marking segment 142, the third marking segment 143, the fourth marking segment 144, and the fifth marking segment 145 that are connected in sequence from head to tail, the marking path 14 is clear and definite, and it is easy for the operator to move the guiding slider 20 from beginning to end according to the marking path 14, improving the threading accuracy.

[0042] The identification path 14 is an identification line screen-printed on the outer surface of the sewing machine housing 10; by using the screen-printed identification line as the identification path 14, the production of the identification path 14 is simple and the cost is low. It can be understood that the identification path 14 can also be a groove line recessed in the outer surface of the sewing machine housing 10.

[0043] It should be noted that the connecting part 21 of the present utility model can clamp the upper sewing thread 30 by a clamping method; the upper sewing thread 30 can also be wound around the connecting part 21, or the upper sewing thread 30 can be tied to the connecting part 21, and then the upper sewing thread 30 can be untied after threading.

[0044] It should also be noted that the guiding slider 20 of the present utility model is magnetically connected to the non-magnetic front cover 15; a clamping connection method can also be adopted, that is, a clamping block is provided on the guiding slider 20, a clamping groove is provided on the outer surface of the non-magnetic front cover 15, the extending direction of the clamping groove is the same as the extending direction of the identification path 14, and the clamping block is clamped in the clamping groove to limit the guiding slider 20 from detaching from the non-magnetic front cover 15, and the clamping block can move along the extending direction of the clamping groove.

[0045] The using method of the present utility model:

[0046] Step 1: An operator holds one end of the upper sewing thread 30, winds the upper sewing thread 30 around the guiding hook 11 and pulls it forward for a certain distance;

[0047] Step 2: Insert one end of the upper sewing thread 30 into the through hole 213, and tighten the sleeve 212. The sleeve 212 covers the through hole 213 to clamp the upper sewing thread 30 in the through hole 213. Manually move the guiding slider 20 to move downward along the first identification section 141, so that the upper sewing thread 30 passes through the guiding plate 12 and the guiding tip 121 in sequence;

[0048] Step 3: Move the guiding slider 20 to move leftward along the second identification section 142, so that the upper sewing thread 30 winds around the guiding tip 121;

[0049] Step 4: Move the guiding slider 20 to move along the third identification section 143 and the fourth identification section 144 in sequence, so that the upper sewing thread 30 winds around the thread take-up lever 13;

[0050] Step 5: Move the guiding slider 20 to move downward along the fifth identification section 145, and loosen the sleeve 212 to release the clamping of the upper sewing thread 30;

[0051] Step 6: Insert the upper sewing thread 30 into the needle hole on the sewing needle 18 to complete the threading operation of the upper sewing thread 30.

[0052] It should be pointed out that in Step 5, it can be selected to leave the upper sewing thread 30 in the through hole 213, or it can be selected to move the upper sewing thread 30 out of the through hole 213.

[0053] In summary, in the present utility model, by providing a guiding slider 20 which is slidably arranged on the outer surface of the sewing machine housing 10, a connecting portion 21 is provided on the guiding slider 20, and a marking path 14 indicating the movement direction of the guiding slider 20 is provided on the outer surface of the sewing machine housing 10. When threading the needle, the operator first winds the upper sewing thread 30 around the guiding hook 11, then connects one end of the upper sewing thread 30 to the connecting portion 21, and then moves the guiding slider 20 according to the indication of the marking path 14, so that the guiding slider 20 drives the connecting portion 21 to sequentially pass through the guiding plate 12, the guiding tip 121 and the thread take-up lever 13 along the marking path 14, thereby enabling the connecting portion 21 to drag the upper sewing thread 30 to sequentially wind around the guiding tip 121 and the thread take-up lever 13, achieving the purpose of assisting the operator to correctly thread the upper sewing thread 30.

[0054] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made to the above embodiments according to the technical reality of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A sewing machine auxiliary threading mechanism, comprising a sewing machine housing, and a guide hook, a guide plate, and a thread take-up lever arranged on the sewing machine housing, wherein the lower end of the guide plate has a guide tip protruding from the sewing machine housing, and is characterized in that: The invention also includes a guide slider, which is slidably arranged on the outer surface of the sewing machine housing. The outer surface of the sewing machine housing is provided with an identification path indicating the movement direction of the guide slider. A connecting part is provided on the guide slider. When threading, one end of the sewing thread is connected to the connecting part. The guide slider is moved so that the guide slider drives the connecting part to pass through the guide plate, the guide tip and the thread take-up rod in sequence along the identification path, and the connecting part drags the sewing thread around the guide tip and the thread take-up rod in sequence.

2. The sewing machine auxiliary threading mechanism according to claim 1, characterized in that: The sewing machine housing has a non-magnetic front cover, the marking path is arranged on the outer surface of the non-magnetic front cover, the guide slider is magnetically connected to the non-magnetic front cover through a magnetic attraction component, and the guide slider is slidably arranged on the outer surface of the non-magnetic front cover through the magnetic attraction component.

3. The sewing machine auxiliary threading mechanism according to claim 2, characterized in that: The guide slider is magnetically connected to the non-magnetic front cover through a magnetic attraction component. The magnetic attraction component includes a first magnetic component and a second magnetic component. The first magnetic component is arranged on the guide slider, and the second magnetic component is movably arranged on the non-magnetic front cover. When the guide slider drives the first magnetic component to move, the first magnetic component drives the second magnetic component to move.

4. The sewing machine auxiliary threading mechanism according to claim 3, characterized in that: The magnetic attraction component also includes a third magnetic component and a fourth magnetic component. The third magnetic component is arranged on the guide slider, and the fourth magnetic component is movably arranged on the non-magnetic front cover. When the guide slider drives the third magnetic component to move, the third magnetic component drives the fourth magnetic component to move. The first magnetic component, the second magnetic component, the third magnetic component, and the fourth magnetic component are all magnets. The magnetic pole of one end of the first magnetic component close to the second magnetic component is opposite to the magnetic pole of one end of the third magnetic component close to the fourth magnetic component.

5. The sewing machine auxiliary threading mechanism according to claim 3, characterized in that: An active groove is provided on the inner surface of the non-magnetic front cover, the active groove faces the identification path, and the extension direction of the active groove is the same as the extension direction of the identification path, and the second magnetic member is movably arranged in the active groove.

6. The sewing machine auxiliary threading mechanism according to claim 5, characterized in that: An opening is provided on one side of the movable groove away from the identification path, and a cover plate is provided at the opening to limit the second magnetic part from leaving the movable groove. The second magnetic part can be magnetically connected to the cover plate, and the magnetic attraction between the first magnetic part and the second magnetic part is greater than the magnetic attraction between the second magnetic part and the cover plate.

7. The sewing machine auxiliary threading mechanism according to claim 1, characterized in that: The connecting part is a thread clamping part, which includes a connecting rod and a sleeve. The connecting rod is installed on the guide slider, and the sleeve can be movably sleeved outside the connecting rod along the axial direction of the connecting rod. The end of the connecting rod close to the sewing machine housing is provided with a through hole for the sewing thread to pass through, and the sleeve can clamp the sewing thread in the through hole.

8. The sewing machine auxiliary threading mechanism according to claim 7, characterized in that: The circumferential outer surface of the connecting rod is provided with an external thread, and the circumferential inner surface of the sleeve is provided with an internal thread. The internal thread cooperates with the external thread so that the sleeve is threadedly connected to the connecting rod.

9. The sewing machine auxiliary threading mechanism according to claim 1, characterized in that: The marking path comprises a first marking segment, a second marking segment, a third marking segment, and a fourth marking segment which are connected end to end in sequence, the first marking segment and the third marking segment both extend from top to bottom along the outer surface of the sewing machine housing, and the second marking segment and the fourth marking segment both extend from left to right along the outer surface of the sewing machine housing.

10. The sewing machine auxiliary threading mechanism according to any one of claims 1 to 9, characterized in that: The marking path is a marking line silk-screened on the outer surface of the sewing machine housing.

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