Anti-loosening sewing machine needle bar fixing mechanism

Abstract

The utility model relates to the technical field of sewing machine needle bars, in particular to an anti-loosening sewing machine needle bar fixing mechanism which can effectively improve the needle bar fixing effect, avoid loosening and prevent influence on work of a needle bar. A cylindrical cavity is formed in the upper needle rod, two sets of sliding holes communicated with the cylindrical cavity are symmetrically formed in the upper needle rod, a lower needle rod is installed at the bottom of the upper needle rod, an installation stud is fixedly arranged at the top end of the fixing sleeve, an installation pin hole is formed in the installation stud, and two sets of guide tables are fixedly arranged on the outer wall of the upper needle rod in a front-back symmetry mode. Pressing rods are slidably arranged on the upper needle rod through matching of the sliding holes, buttons are fixedly arranged on the outer sides of the two pressing rods, movable plates are fixedly connected to the inner sides of the two pressing rods, cambered surfaces matched with the cylindrical cavity are arranged on the outer walls of the two movable plates, a spring is fixedly connected between the two movable plates, and positioning rods are fixedly arranged on the cambered surfaces of the outer sides of the two movable plates; and the two groups of positioning rods are respectively inserted into the two groups of positioning holes under the action of the springs.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machine needle bars, in particular to a sewing machine needle bar fixing mechanism that prevents loosening. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing material are interwoven or sewn together. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm. The sewing speed is fast and the use is easy. It has also led to the development of art forms such as hand-push embroidery and computer embroidery.

[0003] At present, the threaded sleeve fixing structure is mostly used in the installation and fixation of the sewing machine needle bar. This needle bar installation structure has a poor needle bar fixing effect when the sewing machine is working, and is prone to loosening, affecting the operation of the needle bar. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an anti-loosening sewing machine needle bar fixing mechanism which can effectively improve the needle bar fixing effect, avoid loosening, and prevent the needle bar from affecting the operation of the needle bar.

[0005] Technical Solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-loosening sewing machine needle bar fixing mechanism, comprising a needle bar mechanism and an anti-loosening mechanism, the needle bar mechanism comprising an upper needle bar, a cylindrical chamber is provided inside the upper needle bar, two groups of sliding holes connected to the cylindrical chamber are symmetrically provided on the upper needle bar, a lower needle bar is installed at the bottom of the upper needle bar, the anti-loosening mechanism comprises a fixing sleeve, a mounting stud is fixed on the top of the fixing sleeve, a mounting pin hole is provided on the mounting stud, two groups of positioning holes are symmetrically provided on the inner wall of the fixing sleeve, two groups of guide platforms are fixedly provided symmetrically on the outer wall of the upper needle bar, two groups of guide grooves are provided on the inside of the fixing sleeve to cooperate with the guide platforms, and the upper needle bar is inserted into the fixing sleeve through the cooperation of the guide platforms and the guide grooves. The two sets of leveraging are connected with each other, and the two sets of leveraging are connected with each other through the plurality of leveraging holes, and the plurality of leveraging holes are connected with each other through the plurality of leveraging holes.

[0007] Preferably, a docking stud is fixed on the top of the lower needle rod, and a threaded docking hole is provided at the bottom end of the upper needle rod. The lower needle rod is screwed to the bottom of the upper needle rod through the cooperation of the docking stud and the threaded docking hole. A pin hole is provided through the docking stud and the upper needle rod, and an anti-loosening pin is inserted in the pin hole.

[0008] Preferably, a pull ring is fixedly provided at the front end of the anti-loosening pin.

[0009] Preferably, sliding sleeves are provided in the sliding holes on both sides of the upper needle rod.

[0010] Preferably, the outer edges of the two groups of positioning rods are both chamfered.

[0011] The upper needle bar is fixedly connected to the sewing machine body by installing the stud and inserting the pin into the installing pin hole to prevent loosening. When installing the needle bar, the button is pinched and pressed inward by hand, so that the button pushes the pressure rod to slide inward, and the pressure rod pushes the movable plate to slide inward along the guide rod, so that the spring is compressed. Then, the upper needle bar is inserted into the fixing sleeve through the cooperation of the guide platform and the guide groove. The guiding cooperation of the guide platform and the guide groove can more conveniently align the positioning rod with the positioning hole, so that the top end of the upper needle bar contacts the inner top of the fixing sleeve, and then the positioning rod is aligned with the positioning hole. Then, the button is released, so that the positioning rod is inserted into the positioning hole under the action of the spring rebound, and the knob bolt is tightened so that the end of the knob bolt is tightly against the outer wall of the guide platform to complete the fixing of the upper needle bar. Through the cooperation of the positioning rod and the positioning hole, the upper needle bar is stably inserted into the fixing sleeve, thereby effectively improving the fixing effect of the needle bar, avoiding loosening and preventing the work of the needle bar from being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an axonometric structural diagram of the present utility model;

[0013] Figure 2 It is a left-side structural schematic diagram of the present utility model;

[0014] Figure 3 This is a schematic diagram of the axonometric partial cross-sectional structure of the utility model;

[0015] Figure 4 This is a schematic diagram of the bottom axonometric structure of the fixed sleeve in the utility model;

[0016] Figure 5 This is a schematic diagram of the axonometric structure of the upper needle bar in the utility model;

[0017] Figure 6 This is a schematic diagram of the axonometric structure of the lower needle bar in the utility model;

[0018] Figure 7 This is a partial axonometric structural diagram of the anti-loosening mechanism in the utility model;

[0019] Markings in the accompanying drawings: 1. Fixing sleeve; 2. Mounting stud; 3. Mounting pin hole; 4. Positioning hole; 5. Upper needle rod; 6. Pressure rod; 7. Button; 8. Movable plate; 9. Guide rod; 10. Spring; 11. Positioning rod; 12. Lower needle rod; 13. Docking stud; 14. Anti-loosening pin; 15. Guide platform; 16. Guide groove; 17. Knob bolt; 18. Pull ring; 19. Sliding sleeve. DETAILED DESCRIPTION

[0020] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Example

[0022] See also Figure 1-Figure 7The utility model is a sewing machine needle bar fixing mechanism for preventing loosening, comprising an upper needle bar 5, a cylindrical chamber is provided inside the upper needle bar 5, two groups of sliding holes communicating with the cylindrical chamber are symmetrically provided on the upper needle bar 5, a lower needle bar 12 is installed at the bottom of the upper needle bar 5, a mounting stud 2 is fixed on the top of the fixing sleeve 1, a mounting pin hole 3 is provided on the mounting stud 2, two groups of positioning holes 4 are symmetrically provided on the inner wall of the fixing sleeve 1, two groups of guide platforms 15 are fixedly provided on the outer wall of the upper needle bar 5, two groups of guide grooves 16 are provided on the inner side of the fixing sleeve 1 to cooperate with the guide platforms 15, and the upper needle bar 5 is fixed through the cooperation of the guide platforms 15 and the guide grooves 16 Inserted in the fixed sleeve 1, the ends of the two groups of knob bolts 17 are respectively tightened against the outer walls of the two groups of guide platforms 15. The outer wall of the fixed sleeve 1 is provided with two groups of tightening screw holes connected with the guide groove 16. The two groups of tightening screw holes are screwed with knob bolts 17. A pressure rod 6 is provided on the upper needle rod 5 through the sliding hole. The outer sides of the two groups of pressure rods 6 are fixed with buttons 7. The inner sides of the two groups of pressure rods 6 are fixedly connected with movable plates 8. The outer walls of the two groups of movable plates 8 are provided with an arc surface that cooperates with the cylindrical chamber. A guide rod 9 is fixed in the cylindrical chamber. The two groups of movable plates 8 are symmetrically slidably sleeved on the two groups of guide rods 9. There is an elastic fixed connection between the two groups of movable plates 8. Spring 10, the outer arc surface of the two sets of movable plates 8 are fixed with positioning rods 11, and the two sets of positioning rods 11 are respectively inserted into the two sets of positioning holes 4 under the action of the spring 10; when in use, the fixed sleeve 1 is fixedly connected to the sewing machine body by installing the stud 2, and the latch is inserted into the mounting pin hole 3 to prevent loosening. When installing the needle bar, pinch the button 7 by hand and press it inward, so that the button 7 pushes the pressure rod 6 to slide inward, and the pressure rod 6 pushes the movable plate 8 to slide inward along the guide rod 9, so that the spring 10 is compressed, and then the upper needle bar 5 is inserted into the fixed sleeve 1 through the cooperation of the guide platform 15 and the guide groove 16, and the guide platform 15 and the guide groove 16 are respectively inserted into the fixed sleeve 1. The guiding cooperation of the groove 16 can more conveniently align the positioning rod 11 with the positioning hole 4, so that the top of the upper needle rod 5 can reach the top of the inner part of the fixing sleeve 1, and then the positioning rod 11 can be aligned with the positioning hole 4, and then the button 7 can be released to allow the positioning rod 11 to be inserted into the positioning hole 4 under the action of the spring 10 rebounding, and the knob bolt 17 can be screwed so that the end of the knob bolt 17 can be tightly against the outer wall of the guide platform 15 to complete the fixation of the upper needle rod 5. Through the cooperation of the positioning rod 11 and the positioning hole 4, the upper needle rod 5 can be stably inserted into the fixing sleeve 1, thereby effectively improving the fixing effect of the needle bar, avoiding loosening, and preventing the work of the needle bar from being affected.

[0023] The top of the lower needle rod 12 is fixedly provided with a docking stud 13, and the bottom end of the upper needle rod 5 is provided with a threaded docking hole. The lower needle rod 12 is screwed to the bottom of the upper needle rod 5 through the cooperation of the docking stud 13 and the threaded docking hole. A pin hole is provided through the docking stud 13 and the upper needle rod 5, and an anti-loosening pin 14 is inserted in the pin hole; by dividing the needle rod into two parts, when the needle rod needs to be replaced, the staff only needs to pull out the anti-loosening pin 14, and disengage the docking stud 13 from the threaded docking hole by unscrewing the lower needle rod 12. After removing the lower needle rod 12 and replacing it with a new one, the anti-loosening pin 14 is inserted into the pin hole. Only the lower needle rod 12 can be replaced, and there is no need to replace all the needle rods.

[0024] A pull ring 18 is fixedly provided at the front end of the anti-loosening latch 14 ; by providing the pull ring 18 , the anti-loosening latch 14 can be made more convenient when being inserted or removed.

[0025] Slide sleeves 19 are provided in the slide holes on both sides of the upper needle rod 5; by providing the slide sleeves 19, the pressing rod 6 can be pushed to slide more smoothly.

[0026] The outer edges of the two groups of positioning rods 11 are both provided with chamfers; by providing chamfers on the outer edges of the positioning rods 11, the positioning rods 11 can be more easily inserted into the positioning holes 4.

[0027] The utility model is a sewing machine needle bar fixing mechanism for preventing loosening. Its working principle is that when in use, the fixing sleeve 1 is fixedly connected to the sewing machine body by installing the stud 2, and the latch is inserted into the mounting pin hole 3 to prevent loosening. When installing the needle bar, the button 7 is pinched and pressed inward by hand, so that the button 7 pushes the pressure rod 6 to slide inward, and the pressure rod 6 pushes the movable plate 8 to slide inward along the guide rod 9, so that the spring 10 is compressed, and then the upper needle bar 5 is inserted into the fixing sleeve 1 through the cooperation of the guide platform 15 and the guide groove 16. The guiding cooperation of the guide platform 15 and the guide groove 16 can make it more convenient to align the positioning rod 11 with the positioning hole 4, so that the top of the upper needle bar 5 is against the top of the inner part of the fixing sleeve 1, thereby The positioning rod 11 is aligned with the positioning hole 4, and then the button 7 is released, so that the positioning rod 11 is inserted into the positioning hole 4 under the action of the spring 10 rebounding, and the knob bolt 17 is screwed so that the end of the knob bolt 17 is tightly against the outer wall of the guide platform 15 to complete the fixation of the upper needle rod 5. Through the cooperation of the positioning rod 11 and the positioning hole 4, the upper needle rod 5 is stably inserted in the fixing sleeve 1. When the needle rod needs to be replaced, the staff only needs to pull out the anti-loosening pin 14, and disengage the docking stud 13 from the threaded docking hole by unscrewing the lower needle rod 12. After removing the lower needle rod 12 and replacing it with a new one, the anti-loosening pin 14 is inserted into the pin hole. Only the lower needle rod 12 can be replaced, and there is no need to replace all the needle rods.

[0028] The utility model provides a sewing machine needle bar fixing mechanism to prevent loosening. Its installation method, connection method or setting method are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sewing machine needle bar fixing mechanism to prevent loosening, characterized in that: Including needle bar mechanism and anti-loosening mechanism; A needle bar mechanism, comprising an upper needle bar (5), wherein a cylindrical chamber is provided inside the upper needle bar (5), two groups of sliding holes communicating with the cylindrical chamber are symmetrically provided on the upper needle bar (5), and a lower needle bar (12) is installed at the bottom of the upper needle bar (5); The anti-loosening mechanism comprises a fixing sleeve (1), a mounting stud (2) is fixedly provided on the top of the fixing sleeve (1), a mounting pin hole (3) is provided on the mounting stud (2), two groups of positioning holes (4) are symmetrically provided on the inner wall of the fixing sleeve (1), two groups of guide platforms (15) are fixedly provided on the outer wall of the upper needle rod (5) in a front-back symmetrical manner, two groups of guide grooves (16) are provided on the inner part of the fixing sleeve (1) to cooperate with the guide platforms (15), the upper needle rod (5) is inserted into the fixing sleeve (1) through the cooperation of the guide platforms (15) and the guide grooves (16), the ends of the two groups of knob bolts (17) are respectively tightened against the outer walls of the two groups of guide platforms (15), and the outer wall of the fixing sleeve (1) is provided with two groups of tightening screws connected to the guide grooves (16). The two sets of tightening screw holes are both screwed with knob bolts (17). A pressure rod (6) is provided on the upper needle rod (5) through the sliding hole. The outer sides of the two sets of pressure rods (6) are fixed with buttons (7). The inner sides of the two sets of pressure rods (6) are fixedly connected with movable plates (8). The outer walls of the two sets of movable plates (8) are provided with arc surfaces that match the cylindrical chamber. A guide rod (9) is fixed in the cylindrical chamber. The two sets of movable plates (8) are symmetrically slidably sleeved on the two sets of guide rods (9). A spring (10) is fixedly connected between the two sets of movable plates (8). The outer arc surfaces of the two sets of movable plates (8) are both fixed with positioning rods (11). The two sets of positioning rods (11) are respectively inserted into the two sets of positioning holes (4) under the action of the spring (10).

2. The anti-loosening sewing machine needle bar fixing mechanism according to claim 1, characterized in that: The top of the lower needle rod (12) is fixedly provided with a docking stud (13), and the bottom end of the upper needle rod (5) is provided with a threaded docking hole. The lower needle rod (12) is screwed onto the bottom of the upper needle rod (5) through the cooperation between the docking stud (13) and the threaded docking hole. A pin hole is provided through the docking stud (13) and the upper needle rod (5), and an anti-loosening pin (14) is inserted into the pin hole.

3. The anti-loosening sewing machine needle bar fixing mechanism according to claim 2, characterized in that: A pull ring (18) is fixedly provided at the front end of the anti-loosening latch (14).

4. The anti-loosening sewing machine needle bar fixing mechanism according to claim 3, characterized in that: Sliding sleeves (19) are provided in the sliding holes on both sides of the upper needle rod (5).

5. The anti-loosening sewing machine needle bar fixing mechanism according to claim 4, characterized in that: The outer edges of the two groups of positioning rods (11) are both provided with chamfers.

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