Needle fixing mechanism of double-needle sewing machine

Abstract

The utility model discloses a needle fixing mechanism of a double-needle sewing machine, which comprises a double-end needle and a fixing device for fixing the double-end needle on a needle bar of the double-needle sewing machine. The fixing device comprises a cylinder fixedly connected with the lower end of a needle bar of the double-needle sewing machine, a limiting disc fixedly connected with the lower end of the cylinder, a bayonet formed in the side wall of the cylinder and penetrating through the lower end of the cylinder, a first notch formed in the side wall of the limiting disc and penetrating through the upper end and the lower end of the limiting disc, and a sleeve rotationally arranged on the cylinder in a sleeving mode. The second notch is formed in the side wall of the sleeve and penetrates through the lower end of the sleeve; the double-end machine needle comprises a clamping plate which penetrates through the second notch and can be clamped with the bayonet, a connecting block which is fixedly connected with the lower end of the clamping plate and penetrates through the first notch, a needle base fixedly connected with the lower end of the connecting plate, and a pair of needle bodies which are vertically parallel and fixed to the bottom of the needle base. The double-end needle fixing device has the advantage that the double-end needle can be conveniently and stably fixed.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and in particular to a needle fixing mechanism for a double-needle sewing machine. Background Technology

[0002] Double-needle sewing machines (also called double-needle flatbed sewing machines) are commonly used sewing machines that use two needles for two-way or three-way simultaneous sewing, producing a double-threaded, parallel effect when turning corners. Current double-needle sewing machines typically use a connecting rod at the end of the double-needle to insert into the mounting hole of the needle bar, and then secure it with a locking screw. However, because the mounting hole of the needle bar is usually facing downwards and in a blind spot, it is inconvenient to manually align the connecting rod and the mounting hole. Furthermore, the locking screw is small and easily lost, and it is prone to loosening and even stripping over long-term use, leading to unstable double-needle fixation and eventual drop. Utility Model Content

[0003] The purpose of this invention is to provide a needle fixing mechanism for a double-needle sewing machine, which has the effect of conveniently and stably fixing double-headed needles.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a needle fixing mechanism for a double-needle sewing machine, comprising a double-headed needle, a fixing device for fixing the double-headed needle to the needle bar of the double-needle sewing machine, the fixing device comprising a cylinder fixedly connected to the lower end of the needle bar of the double-needle sewing machine, a limiting disc fixedly connected to the lower end of the cylinder and having a diameter larger than the diameter of the cylinder, a slot opened on the side wall of the cylinder and penetrating its lower end, a notch opened on the side wall of the limiting disc and penetrating its upper and lower ends, a sleeve that rotates on the cylinder, and a notch opened on the side wall of the sleeve and penetrating its lower end. 2. A locking assembly for the rotating movement of the locking sleeve, wherein the outer diameter of the cylinder is smaller than the outer diameter of the needle bar of the double-needle sewing machine, and the outer diameter of the sleeve is not larger than the outer diameter of the needle bar of the double-needle sewing machine. The double-headed needle includes a locking plate that passes through notch two and can engage with the locking slot, a connecting block that is fixedly connected to the lower end of the locking plate and passes through notch one, a needle seat that is fixedly connected to the lower end of the connecting plate, and a pair of vertically parallel needles fixed to the bottom of the needle seat. The length and width of the end of the connecting block are smaller than the length and width of the end of the locking plate, and the four sides of the end of the connecting block do not exceed the four sides of the end of the locking plate. When the locking plate engages with the locking slot, it can form a complete cylinder.

[0005] A further feature of this invention is that the needle holder is square, and the upper surface of the needle holder is in close contact with the bottom of the limiting disc.

[0006] A further feature of this invention is that a rubber pad is fixedly attached to the upper surface of the needle holder, and the top of the rubber pad is in close contact with the bottom of the limiting disc.

[0007] A further feature of this invention is that the second notch is flared, with its narrow portion close to the cylinder, and the width of the narrow portion of the second notch is equal to the width of the notch.

[0008] A further feature of this invention is that the upper and lower ends of the sleeve respectively rotate to contact the lower end of the needle rod and the upper end of the limiting disc, and the outer diameters of the three are equal.

[0009] The present invention is further configured as follows: the locking assembly includes a square insertion hole at the bottom of the sleeve, a square locking rod that is movably inserted into the square insertion hole, a spring that is fixedly connected at both ends to the bottom of the square insertion hole and the upper end of the square locking rod, an elongated hole that is opened on the side wall of the sleeve and communicates with the square insertion hole, and a lever that is fixed to one side of the square locking rod and extends out of the elongated hole. The extended part of the square locking rod can be inserted into notch one, and when the square locking rod is inserted into notch one, the sleeve is locked so that it cannot rotate. Notch two and the bayonet are misaligned, so the sleeve cannot rotate to realign with notch two and the bayonet.

[0010] A further feature of this invention is that the limiting disc is provided with a positioning groove for the square locking rod to pass through. When the square locking rod is inserted into the positioning groove, the rotation of the locking sleeve is used to stably maintain the alignment of the notch and the bayonet.

[0011] A further feature of this invention is that: a chamfer is provided on one side of the lower end of the square locking rod, and a ramp that can be parallel to the chamfer is provided on one side of the positioning groove. When the square locking rod is inserted into the positioning groove, the chamfer of the square locking rod and the ramp of the positioning groove are in parallel contact. When the sleeve rotates clockwise, the chamfer of the square locking rod and the ramp of the positioning groove rub against each other, and the ramp of the positioning groove pushes the square locking rod upward to retract it into the square insertion hole.

[0012] A further feature of this invention is that the lever is columnar with a hemispherical head, the width of the elongated hole is equal to the outer diameter of the lever, and neither of them exceeds the outer diameter of the spring.

[0013] A further feature of this invention is that the outer surface of the sleeve is provided with an anti-slip texture.

[0014] The beneficial effects of this utility model are as follows: By adopting the above-mentioned needle fixing mechanism, when it is necessary to install a double-headed needle, firstly, insert the connecting block and the locking plate of the double-headed needle into notch one and through notch two respectively, until the locking plate and the locking slot are engaged with each other. Then, twist the sleeve with two fingers to make notch two and the locking slot misaligned, thereby blocking the exit of the locking plate from the locking slot. Then, when the square insertion hole in the locking component is rotated above notch one with the sleeve, the square locking rod inside will quickly extend out of the square insertion hole under the elastic force of the spring and insert into notch one, thereby locking the sleeve and preventing it from rotating. Finally, since notch two and the locking slot have been misaligned and the sleeve cannot rotate to realign with notch two and the locking slot, the locking plate and the connecting block will be completely fixed on the cylinder and stably connected to the needle bar of the double-needle sewing machine.

[0015] When disassembling a double-ended needle, first move the lever on the side wall of the sleeve upwards, causing it to slide upwards relative to the elongated hole. Then, the square locking rod connected to the lever will gradually retract into the square insertion hole as the lever rises. Once the square locking rod exits notch one, the rotational lock of the sleeve is released. Next, manually rotate the sleeve to realign notch two with the bayonet. Finally, manually pull out the retaining plate and connecting block to quickly remove the old double-ended needle. When notch two and the bayonet are realigned, the square locking rod will insert precisely into the positioning groove, thus easily locking the rotation of the sleeve and stably maintaining the alignment of notch two and the bayonet.

[0016] The aforementioned side-insertion and disassembly method of the double-headed needle is not only simpler and easier than the traditional straight-insertion method of connecting rods and mounting holes, but also, in conjunction with the sleeve and locking structure, can quickly lock the double-headed needle onto the cylinder connecting the needle bar of the double-needle sewing machine. Therefore, compared with the traditional locking screw structure, this needle fixing structure is safer and more convenient, and there is no need to worry about losing parts. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0019] Figure 2 This is an exploded view of this embodiment;

[0020] Figure 3 This is a cross-sectional view of the structure of the locking component in this embodiment, which fully locks the rotation of the sleeve.

[0021] Figure 4 This is a cross-sectional view of the simple locking sleeve rotation structure of the locking component in this embodiment;

[0022] In the diagram, 1. Double-headed needle; 11. Clamping plate; 12. Connecting block; 13. Needle seat; 131. Rubber pad; 14. Needle body; 2. Fixing device; 21. Cylinder; 22. Limiting disc; 221. Positioning groove; 221a. Slope; 23. Bayonet; 24. Notch 1; 25. Sleeve; 26. Notch 2; 27. Locking assembly; 271. Square insertion hole; 272. Square locking rod; 272a. Chamfer; 273. Spring; 274. Long hole; 275. Pulley; 3. Needle bar. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Example: A needle fixing mechanism for a double-needle sewing machine, such as... Figure 1-4 As shown, the device includes a double-headed needle 1 and a fixing device 2 that fixes the double-headed needle 1 to the needle bar 3 of a double-needle sewing machine. The fixing device 2 includes a cylinder 21 fixedly connected to the lower end of the needle bar 3, a limiting disc 22 fixedly connected to the lower end of the cylinder 21 and having a diameter larger than the diameter of the cylinder 21, a notch 23 opened on the side wall of the cylinder 21 and penetrating its lower end, a notch 24 opened on the side wall of the limiting disc 22 and penetrating its upper and lower ends, a sleeve 25 that rotates on the cylinder 21, a notch 26 opened on the side wall of the sleeve 25 and penetrating its lower end, and a locking component 27 that locks the rotational movement of the sleeve 25. The outer diameter of body 21 is smaller than the outer diameter of needle bar 3 of double needle sewing machine, and the outer diameter of sleeve 25 is not greater than the outer diameter of needle bar 3 of double needle sewing machine. Double-headed needle 1 includes a clamping plate 11 that passes through notch 26 and can engage with slot 23, a connecting block 12 that is fixedly connected to the lower end of clamping plate 11 and passes through notch 24, a needle seat 13 that is fixedly connected to the lower end of connecting plate, and a pair of vertically parallel needle bodies 14 that are fixed to the bottom of needle seat 13. The length and width of the end of connecting block 12 are smaller than the length and width of the end of clamping plate 11, and the four sides of the end of connecting block 12 do not exceed the four sides of the end of clamping plate 11. When clamping plate 11 engages with slot 23, it can form a complete cylinder 21.

[0025] Furthermore, the needle holder 13 is square, and the upper surface of the needle holder 13 is in close contact with the bottom of the limiting disc 22, which can prevent gaps between the needle holder 13 and the limiting disc 22 from causing the thread to get stuck.

[0026] Furthermore, a rubber pad 131 is fixedly attached to the upper surface of the needle holder 13, and the top of the rubber pad 131 is in close contact with the bottom of the limiting disc 22. This not only further reinforces the double-headed needle 1, but also absorbs the impact between the limiting disc 22 and the needle holder 13, thus extending the service life of the double-headed needle 1.

[0027] Furthermore, the second notch 26 is funnel-shaped, with its narrow portion close to the cylinder 21. The width of the narrow portion of the second notch 26 is equal to the width of the bayonet 23, which facilitates the quick insertion of the side-mounted card plate 11 into the bayonet 23 by the operator.

[0028] Furthermore, the upper and lower ends of the sleeve 25 rotate to contact the lower end of the needle rod 3 and the upper end of the limiting disc 22 respectively, and the outer diameters of the three are equal, which can prevent gaps between the three from causing the rope to get stuck.

[0029] Furthermore, the locking assembly 27 includes a square insertion hole 271 at the bottom of the sleeve 25, a square locking rod 272 that is movably inserted into the square insertion hole 271, a spring 273 that is fixedly connected at both ends to the bottom of the square insertion hole 271 and the upper end of the square locking rod 272, an elongated hole 274 that is opened on the side wall of the sleeve 25 and communicates with the square insertion hole 271, and a lever 275 that is fixed to one side of the square locking rod 272 and passes through the elongated hole 274. The extended part of the square locking rod 272 can pass through the notch 1 24, and when the square locking rod 272 is inserted into the notch 1 24, the sleeve 25 is locked so that it cannot rotate. The notch 26 and the bayonet 23 are misaligned, and the sleeve 25 cannot rotate to realign with the notch 26 and the bayonet 23. By employing the square insertion hole 271, square locking rod 272, and spring 273 of the aforementioned locking assembly 27, not only can the rotation of the sleeve 25 be effectively locked, but also, in conjunction with the movable lever 275, the rotation lock of the sleeve 25 can be quickly released so that the operator can remove the double-headed needle 1.

[0030] Furthermore, the limiting disc 22 is also provided with a positioning groove 221 for the square locking rod 272 to pass through. When the square locking rod 272 is inserted into the positioning groove 221, the rotation of the locking sleeve 25 is stopped to stably maintain the alignment of the notch 26 and the bayonet 23. By using the positioning groove 221, the rotation of the sleeve 25 can be easily stopped when the notch 26 and the bayonet 23 are realigned, thereby stably maintaining the alignment of the notch 26 and the bayonet 23.

[0031] Furthermore, a chamfer 272a is provided on one side of the lower end of the square locking rod 272, and a ramp 221a parallel to the chamfer 272a is provided on one side of the positioning groove 221. When the square locking rod 272 is inserted into the positioning groove 221, the chamfer 272a of the square locking rod 272 and the ramp 221a of the positioning groove 221 are in parallel contact. When the sleeve 25 rotates clockwise, the chamfer 272a of the square locking rod 272 and the ramp 221a of the positioning groove 221 rub against each other, and the ramp 221a of the positioning groove 221 pushes the square locking rod 272 upward and retracts it into the square insertion hole 271. By using the chamfer 272a and the ramp 221a, the rotational locking of the sleeve 25 by the square locking rod 272 and the positioning groove 221 on the sleeve 25 can be directly released when the sleeve 25 is turned with a certain force, without having to manually move the lever 275 to release it again.

[0032] Furthermore, the lever 275 is columnar with a hemispherical head, which can prevent the cord from getting tangled in the lever 275; the width of the elongated hole 274 is equal to the outer diameter of the lever 275, and neither of them exceeds the outer diameter of the spring 273, which can effectively prevent the spring 273 from deforming and extending out of the elongated hole 274.

[0033] Furthermore, the outer surface of the sleeve 25 is provided with anti-slip texture, which can increase the friction between the fingers and the surface of the sleeve 25, making it easier for the staff to quickly twist the sleeve 25.

[0034] The working principle of this embodiment:

[0035] When installing the double-headed needle 1, first insert the connecting block 12 and the retaining plate 11 of the double-headed needle 1 sideways into notch 1 24 and through notch 26 respectively, until the retaining plate 11 and the retaining slot 23 engage. Then, twist the sleeve 25 with two fingers to offset notch 26 and retaining slot 23, thereby blocking the exit of the retaining plate 11 from the retaining slot 23. Then, wait until the square insertion hole 271 in the locking component 27 is rotated above notch 1 24 with the sleeve 25. Then, the square locking rod 272 inside will quickly extend out of the square insertion hole 271 under the elastic force of the spring 273 and insert into the notch 1 24 to lock the sleeve 25 in this way, so that it cannot rotate; finally, since the notch 26 and the bayonet 23 have been misaligned, and the sleeve 25 cannot rotate to realign with the notch 26 and the bayonet 23, the clamping plate 11 and the connecting block 12 will be completely fixed on the cylinder 21 and stably connected to the needle bar 3 of the double needle sewing machine.

[0036] When it is necessary to disassemble the double-headed needle 1, first, move the lever 275 on the side wall of the sleeve 25 upward, so that the lever 275 slides upward relative to the elongated hole 274. Then, the square locking rod 272 connected to the lever 275 will gradually retract into the square insertion hole 271 as the lever 275 rises. When the square locking rod 272 exits the notch 1 24, the rotation lock of the sleeve 25 can be released. Then, manually rotate the sleeve 25 to realign the notch 26 and the bayonet 23. Finally, manually pull out the card plate 11 and the connecting block 12 to quickly remove the old double-headed needle 1. When the notch 26 and the bayonet 23 are realigned, the square locking rod 272 will be inserted into the positioning groove 221, thereby simply locking the rotation of the sleeve 25 and stabilizing the alignment of the notch 26 and the bayonet 23.

Claims

1. A needle fixing mechanism for a double-needle sewing machine, comprising a double-headed needle (1) and a fixing device (2) for fixing the double-headed needle (1) to the needle bar of the double-needle sewing machine, characterized in that, The fixing device (2) includes a cylinder (21) fixedly connected to the lower end of the needle bar of a double-needle sewing machine, a limiting disc (22) fixedly connected to the lower end of the cylinder (21) and having a diameter larger than that of the cylinder (21), a bayonet (23) opened on the side wall of the cylinder (21) and penetrating its lower end, a notch one (24) opened on the side wall of the limiting disc (22) and penetrating its upper and lower ends, a sleeve (25) rotatably fitted on the cylinder (21), a notch two (26) opened on the side wall of the sleeve (25) and penetrating its lower end, and a locking component (27) locking the rotational movement of the sleeve (25). The outer diameter of the cylinder (21) is smaller than the outer diameter of the needle bar of the double-needle sewing machine. The outer diameter of the sleeve (25) is not greater than the outer diameter of the needle bar of the double needle sewing machine. The double-headed needle (1) includes a clamping plate (11) that passes through the second notch (26) and can engage the latch (23), a connecting block (12) that is fixedly connected to the lower end of the clamping plate (11) and passes through the first notch (24), a needle seat (13) that is fixedly connected to the lower end of the connecting plate, and a pair of vertically parallel needle bodies (14) that are fixed to the bottom of the needle seat (13). The length and width of the end of the connecting block (12) are smaller than the length and width of the end of the clamping plate (11), and the four sides of the end of the connecting block (12) do not exceed the four sides of the end of the clamping plate (11). When the clamping plate (11) engages the latch (23), it can form a complete cylinder (21).

2. The needle fixing mechanism for a double-needle sewing machine according to claim 1, characterized in that: The needle holder (13) is square, and the upper surface of the needle holder (13) is in close contact with the bottom of the limiting disc (22).

3. The needle fixing mechanism for a double-needle sewing machine according to claim 2, characterized in that: A rubber pad (131) is fixedly attached to the upper surface of the needle holder (13), and the top of the rubber pad (131) is in close contact with the bottom of the limiting disc (22).

4. The needle fixing mechanism for a double-needle sewing machine according to claim 1, characterized in that: The second notch (26) is horn-shaped, and the narrow part is close to the cylinder (21). The width of the narrow part of the second notch (26) is equal to the width of the notch (23).

5. The needle fixing mechanism for a double-needle sewing machine according to claim 1, characterized in that: The upper and lower ends of the sleeve (25) respectively rotate to contact the lower end of the needle rod and the upper end of the limiting disc (22), and the outer diameters of the three are equal.

6. The needle fixing mechanism for a double-needle sewing machine according to claim 1, characterized in that: The locking assembly (27) includes a square insertion hole (271) at the bottom of the sleeve (25), a square locking rod (272) that is movably inserted into the square insertion hole (271), a spring (273) that is fixedly connected at both ends to the bottom of the square insertion hole (271) and the upper end of the square locking rod (272), an elongated hole (274) on the side wall of the sleeve (25) and communicating with the square insertion hole (271), and a lever (275) fixed to one side of the square locking rod (272) and passing through the elongated hole (274). The extended part of the square locking rod (272) can be inserted into notch one (24), and when the square locking rod (272) is inserted into notch one (24), the sleeve (25) is locked so that it cannot rotate. Notch two (26) and the bayonet (23) are misaligned, and the sleeve (25) cannot rotate to realign with notch two (26) and the bayonet (23).

7. The needle fixing mechanism for a double-needle sewing machine according to claim 6, characterized in that: The limiting disc (22) is also provided with a positioning groove (221) for the square locking rod (272) to pass through. When the square locking rod (272) is inserted into the positioning groove (221), the rotation of the locking sleeve (25) is used to stably maintain the alignment of the notch (26) and the bayonet (23).

8. The needle fixing mechanism for a double-needle sewing machine according to claim 7, characterized in that: The lower end of the square locking rod (272) is chamfered (272a), and the positioning groove (221) is provided with a ramp (221a) that can be parallel to the chamfer (272a) on one side. When the square locking rod (272) is inserted into the positioning groove (221), the chamfer (272a) of the square locking rod (272) and the ramp (221a) of the positioning groove (221) are in parallel contact. When the sleeve (25) rotates clockwise, the chamfer (272a) of the square locking rod (272) and the ramp (221a) of the positioning groove (221) rub against each other, and the ramp (221a) of the positioning groove (221) pushes the square locking rod (272) back into the square insertion hole (271).

9. A needle fixing mechanism for a double-needle sewing machine according to claim 6, characterized in that: The lever (275) is columnar with a hemispherical head. The width of the elongated hole (274) is equal to the outer diameter of the lever (275), and neither of them exceeds the outer diameter of the spring (273).

10. The needle fixing mechanism for a double-needle sewing machine according to claim 1, characterized in that: The outer surface of the sleeve (25) is provided with anti-slip texture.

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