A type of anti-loosening sewing machine needle bar

Abstract

This utility model relates to the field of sewing machine needle bars, specifically an anti-loosening sewing machine needle bar, comprising a needle bar body and a needle head body. The needle head body is inserted into the interior of the needle bar body, and a connecting screw is provided through the interior of both the needle bar body and the needle head body. This utility model inserts the needle head body into the interior of the needle bar body, then inserts the connecting screw from right to left through the needle bar body and the needle head body, exposing it. A threaded sleeve is then threadedly connected to the connecting screw until the threaded sleeve is positioned inside a side groove. As the threaded sleeve rotates and moves, the anti-loosening sleeve moves, and the anti-loosening plate inside the anti-loosening sleeve engages in the groove, thus limiting the position of the anti-loosening sleeve and achieving the effect of preventing loosening. This solves the problem that during sewing machine operation, the sewing machine's continuous up-and-down movement can easily cause the screw to loosen due to the vibration of the needle, leading to the needle moving up and down and greatly reducing sewing quality.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine needle bars, specifically an anti-loosening sewing machine needle bar. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products made of leather, plastic, and paper. The stitches produced are neat, beautiful, flat, and strong. Sewing is fast and easy to use, and it has given rise to art forms such as hand-pushed embroidery and computer embroidery.

[0003] In the installation and fixing of sewing machine needle bars, a sleeve structure is mostly used, and then the needle bar and needle head are connected and fixed by screws. When the sewing machine is working, the sewing machine will move up and down continuously. This can easily cause the screws to loosen due to the vibration of the needle movement, causing the needle to move up and down, which greatly reduces the sewing quality of the sewing machine. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention proposes an anti-loosening sewing machine needle bar. During sewing machine operation, the constant up-and-down movement of the sewing machine can easily cause the screw to loosen due to the vibration of the needle movement, resulting in the needle moving up and down and greatly reducing the sewing quality.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a sewing machine needle bar with anti-loosening mechanism, including a needle bar body and a needle head body, wherein the needle head body is inserted into the inside of the needle bar body, and a connecting screw is provided through the inside of both the needle bar body and the needle head body, and an anti-loosening mechanism is provided on one side of the surface of the connecting screw.

[0006] The anti-loosening mechanism includes a threaded sleeve, the inside of which is threadedly connected to the surface of the connecting screw. An anti-detachment sleeve is fixedly connected to the left side of the threaded sleeve. The inner cavity of the anti-detachment sleeve has six grooves. A smooth rod is fixedly connected inside the grooves. An anti-detachment plate is rotatably connected to the center of the surface of the smooth rod.

[0007] Preferably, the surface of the connecting screw is provided with a groove, the opening diameter of the groove is the same as the cross-sectional area of ​​the anti-detachment plate, and the surface of the anti-detachment plate is in contact with the inner wall of the groove.

[0008] Preferably, a torsion spring is slidably sleeved on both the front and back sides of the surface of the light rod. One end of the torsion spring is fixedly connected to the inner wall of the groove, and the other end of the torsion spring is fixedly connected to the surface of the anti-detachment plate.

[0009] Preferably, a side groove is provided on the left side of the needle bar body surface, the diameter of the side groove is larger than the diameter of the threaded sleeve, and one side of the threaded sleeve is tightly fitted into the inside of the side groove, and a locking groove is provided on one side of the connecting screw.

[0010] Preferably, a reset mechanism is provided on one side of the anti-detachment sleeve. The reset mechanism includes a connecting ring and an insertion slot. There are two insertion slots, and the two insertion slots are arranged horizontally. The insertion slots are opened inside the anti-detachment sleeve. A damping pad is fixedly connected to the inner wall of the insertion slot. An insertion block is inserted into the inside of the damping pad. A connecting ring is fixedly connected to one side of the insertion block. The connecting ring fits against one side of the anti-detachment sleeve.

[0011] Preferably, one side of the connecting ring is fixedly connected to an insertion rod, and there are multiple insertion rods, the surfaces of which are inclined. Push plates are fixedly connected to both the top and bottom of the connecting ring, one end of which is arc-shaped and extends beyond the anti-detachment sleeve.

[0012] Preferably, a sealing gasket is fixedly connected inside the needle bar body, and the inner side of the sealing gasket is in close contact with the surface of the needle body.

[0013] The advantages of this utility model are:

[0014] This invention involves inserting the needle body into the needle bar body, then inserting a connecting screw through the needle bar body and needle body from right to left until it protrudes, and then threading a threaded sleeve to the connecting screw until the threaded sleeve is placed inside the side groove. As the threaded sleeve rotates and moves, the anti-loosening sleeve moves, and the anti-loosening plate inside the anti-loosening sleeve will engage in the groove, thereby limiting the position of the anti-loosening sleeve and achieving the effect of preventing loosening. This solves the problem that when a sewing machine is working, the constant up and down movement of the sewing machine can easily cause the screw to loosen due to the vibration of the needle movement, resulting in the needle moving up and down and greatly reducing the sewing quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a partial sectional view of the structure of the needle bar body and the needle head body of this utility model;

[0018] Figure 3 This utility model Figure 2 A magnified view of a portion of point A in the middle;

[0019] Figure 4 This is a schematic diagram showing the connection between the threaded sleeve and the anti-disengagement sleeve structure of this utility model;

[0020] Figure 5 This utility model Figure 4 A magnified view of a portion of point B in the middle;

[0021] Figure 6 This utility model Figure 4 A magnified view of a portion of point C in the middle;

[0022] Figure 7 This is a schematic diagram showing the connection of the connecting screw, threaded sleeve, and anti-disengagement sleeve structure of this utility model;

[0023] Figure 8 This utility model Figure 7 A magnified view of a portion of point D in the middle;

[0024] Figure 9 This is a left view of the connecting screw and anti-disengagement sleeve structure of this utility model;

[0025] Figure 10 This is a diagram showing the gap between the threaded sleeve and the connecting screw of this utility model.

[0026] In the diagram: 1. Needle bar body; 2. Needle head body; 3. Connecting screw; 4. Side groove; 5. Anti-loosening mechanism; 51. Threaded sleeve; 52. Anti-disengagement sleeve; 53. Groove; 54. Torsion spring; 55. Smooth rod; 56. Anti-disengagement plate; 6. Sealing gasket; 7. Reset mechanism; 71. Connecting ring; 72. Insertion rod; 73. Push plate; 74. Insertion groove; 75. Damping pad; 76. Insertion block; 8. Locking groove; 9. Slot. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0028] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0029] This application discloses an anti-loosening sewing machine needle bar. (Refer to...) Figure 1 and Figure 10 A sewing machine needle bar with anti-loosening mechanism includes a needle bar body 1 and a needle head body 2. The needle head body 2 is inserted into the needle bar body 1. A connecting screw 3 is provided through the interior of both the needle bar body 1 and the needle head body 2. An anti-loosening mechanism 5 is provided on one side of the surface of the connecting screw 3. By setting the anti-loosening mechanism 5, the position of the connecting screw 3 can be fixed after the connecting screw 3 passes through the needle bar body 1 and the needle head body 2. At the same time, it can prevent the connecting screw 3 from rotating due to vibration and loosening and falling off.

[0030] The anti-loosening mechanism 5 includes a threaded sleeve 51, the inside of which is threadedly connected to the surface of the connecting screw 3. An anti-disengagement sleeve 52 is fixedly connected to the left side of the threaded sleeve 51. The threaded sleeve 51 and the anti-disengagement sleeve 52 are integrally formed. The inner cavity of the anti-disengagement sleeve 52 has six grooves 53. The six grooves 53 are fixedly connected to the inside of the grooves 53. The smooth rod 55 is fixedly connected to the inside of the grooves 53, thus supporting the position of the anti-disengagement plate 56 and allowing the anti-disengagement plate 56 to rotate smoothly under force. At the same time, the depth and area of ​​the grooves 53 are larger than those of the anti-disengagement plate 56, thus ensuring the normal operation of the anti-disengagement plate 56. The anti-disengagement plate 56 is rotatably connected to the center of the surface of the smooth rod 55. Through the threaded connection between the threaded sleeve 51 and the connecting screw 3, the connecting screw 3 can be fixed between the needle bar body 1 and the needle body 2, thus realizing the installation of the needle body 2.

[0031] Reference Figure 7 and Figure 8 The surface of the connecting screw 3 is provided with slots 9, the number of slots 9 is the same as the number of grooves 53, and they are used in conjunction with the anti-detachment plate 56. The opening diameter of the slots 9 is the same as the cross-sectional area of ​​the anti-detachment plate 56, and the surface of the anti-detachment plate 56 is in contact with the inner wall of the slots 9. Through the setting of the slots 9, when the threaded sleeve 51 is rotated, the anti-detachment sleeve 52 will be driven to rotate together. The anti-detachment sleeve 52 will drive the anti-detachment plate 56 to be inserted into the inside of the slots 9. Under the action of the slots 9, the anti-detachment plate 56 is prevented from rotating, and then the anti-detachment sleeve 52 is prevented from rotating. At the same time, under the threaded connection between the threaded sleeve 51 and the connecting screw 3, the anti-detachment sleeve 52 moves into the side groove 4 with the threaded sleeve 51, and then the anti-detachment plate 56 rotates and moves on the surface of the slots 9.

[0032] Reference Figure 4 and Figure 6Torsion springs 54 are slidably sleeved on the front and back sides of the surface of the bare rod 55. One end of the torsion spring 54 is fixedly connected to the inner wall of the groove 53, and the other end of the torsion spring 54 is fixedly connected to the surface of the anti-detachment plate 56. Because the torsion spring 54 is located on the front and back sides of the anti-detachment plate 56, when the anti-detachment plate 56 is subjected to force and rotates outward towards the anti-detachment sleeve 52, the torsion spring 54 can absorb the force generated by its rotation. After the anti-detachment plate 56 loses force, the torsion spring 54 restores its deformation, allowing the anti-detachment plate 56 to smoothly insert into the slot 9, thereby fixing the position of the anti-detachment sleeve 52 to rotate and move, and preventing the anti-detachment sleeve 52 from rotating back.

[0033] Reference Figure 2 and Figure 3 A side groove 4 is provided on the left side of the surface of the needle bar body 1. The diameter of the side groove 4 is larger than the diameter of the threaded sleeve 51, and one side of the threaded sleeve 51 is tightly fitted inside the side groove 4. A locking groove 8 is provided on one side of the connecting screw 3. The side groove 4 provides space for the position of the threaded sleeve 51, so that the threaded sleeve 51 can be tightly fitted to one side of the needle bar body 1, thereby fixing the position of the connecting screw 3.

[0034] Reference Figure 4 and Figure 5 A reset mechanism 7 is provided on one side of the anti-detachment sleeve 52. The reset mechanism 7 includes a connecting ring 71 and an insertion groove 74. There are two insertion grooves 74, and the two insertion grooves 74 are arranged horizontally. The insertion grooves 74 are opened inside the anti-detachment sleeve 52. A damping pad 75 is fixedly connected to the inner wall of the insertion groove 74. An insertion block 76 is inserted into the inside of the damping pad 75. A connecting ring 71 is fixedly connected to one side of the insertion block 76. The connecting ring 71 fits against one side of the anti-detachment sleeve 52. Through the setting of the insertion groove 74, the insertion block 76 can be smoothly inserted into the anti-detachment sleeve 52, thus fixing the position of the connecting ring 71. At the same time, the setting of the damping pad 75 increases the friction between the insertion groove 74 and the insertion block 76, preventing the insertion block 76 from detaching from the insertion groove 74.

[0035] Reference Figure 4 and Figure 5 A plurality of extension rods 72 are fixedly connected to one side of the connecting ring 71. The surfaces of the extension rods 72 are inclined. Push plates 73 are fixedly connected to the top and bottom of the connecting ring 71. One end of the push plate 73 is arc-shaped and extends to the outside of the anti-disengagement sleeve 52. The extension rods 72 are positioned such that their height is the same as the distance between the anti-disengagement sleeve 52 and the connecting screw 3, allowing the extension rods 72 to smoothly extend into the space between the anti-disengagement sleeve 52 and the connecting screw 3. Figure 10The diagram shows the spacing between the anti-disengagement sleeve 52 and the connecting screw 3. During the insertion of the extension rod 72, the extension rod 72 is set at an angle, which will cause the anti-disengagement plate 56 to rotate outward, so that the anti-disengagement plate 56 can be smoothly disengaged from the slot 9, and the threaded sleeve 51 and the anti-disengagement sleeve 52 can be flipped off the surface of the connecting screw 3, thereby realizing the removal of the needle body 2.

[0036] Reference Figure 2 and Figure 3 A sealing gasket 6 is fixedly connected inside the needle bar body 1. The inner side of the sealing gasket 6 is tightly attached to the surface of the needle body 2. By setting the sealing gasket 6, the sealing between the needle bar body 1 and the needle body 2 can be improved after the needle body 2 is inserted into the needle bar body 1, preventing external impurities from entering the interior of the needle bar body 1.

[0037] Working principle: First, the needle body 2 is inserted into the needle bar body 1 and fits against the inside of the sealing gasket 6. Then, the connecting screw 3 passes through the needle bar body 1 and the needle body 2 from right to left and protrudes from the left side of the needle bar body 1. Next, the threaded sleeve 51 is fitted onto the surface of the connecting screw 3 and the threaded sleeve 51 is rotated. The rotation of the threaded sleeve 51 drives the anti-disengagement sleeve 52 to rotate, and the rotation of the anti-disengagement sleeve 52 drives the anti-disengagement plate 56 to rotate on the surface of the connecting screw 3. The rotation of the anti-disengagement plate 56 causes the torsion spring 54 to deform, and after the torsion spring 54 returns to its original deformation, it can prevent the anti-disengagement plate from rotating. 56 remains firmly inserted inside the slot 9 and will not rotate. When the threaded sleeve 51 rotates, its threaded connection with the connecting screw 3 causes the threaded sleeve 51 to rotate and move into the side slot 4. The anti-disengagement sleeve 52, fixed to the threaded sleeve 51, will rotate and move together with the threaded sleeve 51 until the threaded sleeve 51 is tightly fitted inside the side slot 4. The threaded connection between the threaded sleeve 51 and the connecting screw 3 fixes the position of the connecting screw 3, thus enabling the installation of the needle body 2. To prevent the threaded sleeve 51 from rotating and loosening, after the anti-disengagement plate 56 is inserted into the slot 9, as... Figure 9 As shown, the anti-disengagement plate 56 restricts the anti-disengagement sleeve 52 from rotating, thus ensuring that the threaded sleeve 51 will not loosen after being locked. To remove the needle body 2, the push plate 73 needs to be manually pushed to the left. The movement of the push plate 73 causes the connecting ring 71 to move, which in turn causes the insertion block 76 to disengage from the insertion groove 74. At the same time, the movement of the connecting ring 71 causes the extension rod 72 to move until the insertion block 76 is completely removed from the insertion groove 74. Then, the position of the connecting ring 71 is flipped so that the extension rod 72 faces away. Figure 4 With the extension rod 72 positioned in the positive direction, the connecting ring 71 is pushed to cause the extension rod 72 to be inserted through the gap between the anti-disengagement sleeve 52 and the connecting screw 3, as shown. Figure 9 and Figure 10As shown, the inclined surface of the extension rod 72 will cause the anti-detachment plate 56 to rotate outward, thereby causing the anti-detachment plate 56 to disengage from the slot 9, and the threaded sleeve 51 can be rotated in the opposite direction to disengage from the surface of the connecting screw 3.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A sewing machine needle bar with anti-loosening mechanism, comprising a needle bar body (1) and a needle head body (2), characterized in that: The needle body (2) is inserted into the needle bar body (1). A connecting screw (3) is provided through the interior of both the needle bar body (1) and the needle body (2). An anti-loosening mechanism (5) is provided on one side of the surface of the connecting screw (3). The anti-loosening mechanism (5) includes a threaded sleeve (51), the inside of which is threadedly connected to the surface of the connecting screw (3). An anti-detachment sleeve (52) is fixedly connected to the left side of the threaded sleeve (51). The inner cavity of the anti-detachment sleeve (52) is provided with a groove (53). There are six grooves (53). A smooth rod (55) is fixedly connected inside the groove (53). An anti-detachment plate (56) is rotatably connected to the center of the surface of the smooth rod (55).

2. The anti-loosening sewing machine needle bar according to claim 1, characterized in that: The surface of the connecting screw (3) is provided with a groove (9), the opening diameter of the groove (9) is the same as the cross-sectional area of ​​the anti-detachment plate (56), and the surface of the anti-detachment plate (56) is in contact with the inner wall of the groove (9).

3. The anti-loosening sewing machine needle bar according to claim 1, characterized in that: The front and back sides of the surface of the light rod (55) are slidably fitted with torsion springs (54), one end of the torsion spring (54) is fixedly connected to the inner wall of the groove (53), and the other end of the torsion spring (54) is fixedly connected to the surface of the anti-detachment plate (56).

4. The anti-loosening sewing machine needle bar according to claim 1, characterized in that: A side groove (4) is provided on the left side of the surface of the needle bar body (1). The diameter of the side groove (4) is larger than the diameter of the threaded sleeve (51), and one side of the threaded sleeve (51) is tightly fitted inside the side groove (4). A locking groove (8) is provided on one side of the connecting screw (3).

5. The anti-loosening sewing machine needle bar according to claim 1, characterized in that: A reset mechanism (7) is provided on one side of the anti-slip sleeve (52). The reset mechanism (7) includes a connecting ring (71) and an insertion groove (74). There are two insertion grooves (74), and the two insertion grooves (74) are arranged in a horizontal direction. The insertion groove (74) is opened inside the anti-slip sleeve (52). A damping pad (75) is fixedly connected to the inner wall of the insertion groove (74). An insertion block (76) is inserted into the inside of the damping pad (75). A connecting ring (71) is fixedly connected to one side of the insertion block (76). The connecting ring (71) fits against one side of the anti-slip sleeve (52).

6. The anti-loosening sewing machine needle bar according to claim 5, characterized in that: One side of the connecting ring (71) is fixedly connected to an insertion rod (72). There are multiple insertion rods (72). The surface of the insertion rod (72) is inclined. The top and bottom of the connecting ring (71) are fixedly connected to a push plate (73). One end of the push plate (73) is arc-shaped and extends to the outside of the anti-detachment sleeve (52).

7. The anti-loosening sewing machine needle bar according to claim 1, characterized in that: A sealing gasket (6) is fixedly connected inside the needle bar body (1), and the inner side of the sealing gasket (6) is tightly attached to the surface of the needle body (2).

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