Driving device of lockstitch sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a lockstitch sewing machine driving device which comprises a main shaft, a belt pulley, a bearing rod, a take-up lever, a needle bar transmission wheel and a rotating rod, one end of the main shaft is fixedly connected with the belt pulley, the other end of the main shaft is fixedly connected with the needle bar transmission wheel, and one side of the needle bar transmission wheel is rotatably connected with the rotating rod. The lower end of the rotating rod is connected with a connecting rod in an inserted mode, one end of the connecting rod is fixedly connected with a needle rod connecting shaft, the needle rod inserting groove is located on the needle rod connecting shaft, the fixing device is located on the two sides of the needle rod connecting shaft, the installation rings are located on the two sides of the needle rod connecting shaft, and needle rods are movably connected in the needle rod inserting groove in an inserted mode. Needle bars of different sizes can be rapidly replaced according to needs, the requirements of different knitted fabrics are met, the applicability of the driving device is improved, and the driving device can adapt to wider application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a driving device for a lockstitch sewing machine. Background Art

[0002] A lockstitch sewing machine is a machine used to sew fabrics, also known as a straight-line sewing machine. It is a basic equipment in industries such as clothing manufacturing, footwear, home textiles and leather manufacturing. The lockstitch sewing machine uses two threads, a needle and a shuttle, to form a lockstitch, and can perform basic straight-line sewing, including splicing, flat seams, and bevel seams. The stitches it sews are neat, beautiful, even, and very strong. The lockstitch sewing machine is the most basic type of industrial sewing machine, and is particularly suitable for sewing silk, linen, cotton, wool, chemical fiber and other fabrics, as well as clothing, clothing, bedding, bags, bags, tablecloths, curtains, etc. made of soft leather and artificial leather.

[0003] In the drive device of a flat-bed sewing machine, the needle bar is the most easily damaged component and needs to be replaced frequently. In addition, different knitted fabrics may require needle bars of different sizes for crocheting, and the drive device of an ordinary flat-bed sewing machine is not convenient for fixing needle bars of different sizes, resulting in lower applicability and higher production costs. For this reason, we propose a drive device for a flat-bed sewing machine. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a driving device for a lockstitch sewing machine, which solves the above-mentioned problems.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lockstitch sewing machine driving device, comprising a main shaft, a pulley, a bearing rod, a thread take-up rod, a needle bar transmission wheel and a rotating rod, one end of the main shaft is fixedly connected to the pulley, the pulley is rotatably connected to the motor, the end of the main shaft close to the pulley is rotatably connected to the bearing rod, the end of the main shaft close to the bearing rod is movably connected to the thread take-up rod, the bearing rod and the thread take-up rod are connected to the thread shuttle and the thread shuttle box below, the other end of the main shaft is fixedly connected to the needle bar transmission wheel, the side of the needle bar transmission wheel away from the main shaft is rotatably connected to the rotating rod, the lower end of the rotating rod is movably plugged with a connecting rod, the end of the connecting rod away from the rotating rod is fixedly connected to the needle bar connecting shaft, and also includes:

[0008] The needle bar slot is located on the needle bar connecting shaft and is used for inserting the needle bar;

[0009] A fixing device, located on both sides of the needle bar connecting shaft, used for fixing the needle bar;

[0010] There are two mounting rings, located on both sides of the needle bar connecting shaft, used to prevent the fixing device from loosening;

[0011] A needle bar is movably inserted into the needle bar slot.

[0012] Preferably, a needle bar slot penetrating the upper and lower sides is provided on the upper surface of the needle bar connecting shaft, and a plurality of protrusions connected in an annular shape and at equal distances are fixedly connected to the inner wall of the needle bar slot to increase the friction between the needle bar and the needle bar.

[0013] Preferably, mounting rings are fixedly connected to both sides of the needle rod connecting shaft.

[0014] Preferably, the fixing device includes a needle bar fixing part, an arc-shaped groove and a cross-rotation groove, thread grooves are provided on both sides of the needle bar connecting shaft corresponding to the inner ring of the fixing device, the needle bar fixing part is threadedly connected in the thread groove, a cross-rotation groove is provided on the side of the needle bar fixing part close to the mounting ring, and four equally spaced arc-shaped grooves are provided on the side of the needle bar fixing part close to the cross-rotation groove.

[0015] Preferably, the fixing device also includes a fixing block, an arc-shaped plug block, an anti-rotation block and a threaded extension rod, the four arc-shaped grooves are movably inserted with an arc-shaped plug block, one end of the four arc-shaped plug blocks away from the needle bar fixing piece is fixedly connected to the fixing block, one end of the fixing block away from the arc-shaped plug block is fixedly connected to the threaded extension rod, and the anti-rotation block is threadedly connected to the threaded extension rod.

[0016] Preferably, the anti-rotation block is fixedly connected to a rotating knob on one side away from the fixed block, the side surface of the anti-rotation block is threadedly connected to the inner side of the mounting ring, and the direction of the threaded grooves on the threaded extension rod and the outer side of the anti-rotation block is opposite to the direction in which the threaded grooves of the needle rod fixing member are opened.

[0017] Preferably, the opposite ends of the two needle bar fixing members extend into the needle bar slot and abut against the needle bar.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the utility model provides a driving device for a lockstitch sewing machine, which has the following beneficial effects:

[0020] 1. The driving device of the sewing machine allows the operator to quickly replace needle bars of different sizes as needed through the fixing device, which greatly reduces the time and labor intensity required for replacing the needle bars and improves production efficiency. The design of the slot, in conjunction with the fixing device, allows the operator to easily insert and fix needle bars of different sizes, meeting the needs of different knitted fabrics, improving the applicability of the driving device, and enabling it to adapt to a wider range of application scenarios.

[0021] 2. The driving device of the lockstitch sewing machine has a simple and reasonable structural design and is easy to operate. Even operators without professional knowledge can quickly master the use method, which greatly reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the needle bar connecting shaft of the utility model;

[0024] Figure 3 This is a schematic diagram of the disassembled structure of the fixing device of the utility model;

[0025] Figure 4 It is a schematic diagram of the fixed block and the anti-rotation block of the utility model.

[0026] In the figure: 1. main shaft; 2. pulley; 3. bearing rod; 4. thread take-up rod; 5. needle bar driving wheel; 6. rotating rod; 7. needle bar connecting shaft; 8. needle bar; 9. connecting rod; 10. mounting ring; 11. needle bar slot; 12. fixing device; 13. needle bar fixing piece; 14. arc groove; 15. cross rotating groove; 16. fixing block; 17. arc plug block; 18. anti-rotation block; 19. threaded extension rod; 20. rotating knob. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-4 A lockstitch sewing machine driving device comprises a main shaft 1, a pulley 2, a bearing rod 3, a thread take-up rod 4, a needle bar driving wheel 5 and a rotating rod 6, one end of the main shaft 1 is fixedly connected to the pulley 2, the pulley 2 is rotatably connected to the motor, the end of the main shaft 1 close to the pulley 2 is rotatably connected to the bearing rod 3, the end of the main shaft 1 close to the bearing rod 3 is movably connected to the thread take-up rod 4, the bearing rod 3 and the thread take-up rod 4 are connected to the thread shuttle and the thread shuttle box below, the other end of the main shaft 1 is fixedly connected to the needle bar driving wheel 5, the side of the needle bar driving wheel 5 away from the main shaft 1 is rotatably connected to the rotating rod 6, the lower end of the rotating rod 6 is movably plugged with a connecting rod 9, and the end of the connecting rod 9 away from the rotating rod 6 is fixedly connected to the needle bar connecting shaft 7, and also comprises:

[0029] The needle bar slot 11 is located on the needle bar connecting shaft 7 and is used for inserting the needle bar;

[0030] The fixing device 12 is located on both sides of the needle bar connecting shaft 7 and is used to fix the needle bar;

[0031] There are two mounting rings 10, which are located on both sides of the needle bar connecting shaft 7 and are used to prevent the fixing device 12 from loosening;

[0032] The needle bar 8 is movably inserted into the needle bar slot 11 .

[0033] Furthermore, a needle bar slot 11 penetrating the upper and lower sides is provided on the upper surface of the needle bar connecting shaft 7, and a plurality of protrusions connected in an annular shape and at equal distances are fixedly connected to the inner wall of the needle bar slot 11 to increase the friction force between the needle bar 8 and the needle bar 8.

[0034] Furthermore, mounting rings 10 are fixedly connected to both sides of the needle bar connecting shaft 7 .

[0035] Furthermore, the fixing device 12 includes a needle bar fixing part 13, an arc-shaped groove 14 and a cross-rotation groove 15. The inner ring of the fixing device 12 is provided with threaded grooves on both sides of the needle bar connecting shaft 7 corresponding to the needle bar connecting shaft 7. The needle bar fixing part 13 is threadedly connected in the threaded groove. The side of the needle bar fixing part 13 close to the mounting ring 10 is provided with a cross-rotation groove 15. The side of the needle bar fixing part 13 close to the cross-rotation groove 15 is provided with four equally spaced arc-shaped grooves 14.

[0036] Furthermore, the fixing device 12 also includes a fixing block 16, an arc-shaped plug block 17, an anti-rotation block 18 and a threaded extension rod 19. The four arc-shaped grooves 14 are movably connected with the arc-shaped plug blocks 17. The ends of the four arc-shaped plug blocks 17 away from the needle bar fixing piece 13 are fixedly connected to the fixing block 16. The ends of the fixing blocks 16 away from the arc-shaped plug blocks 17 are fixedly connected to the threaded extension rod 19. The anti-rotation block 18 is threadedly connected to the threaded extension rod 19.

[0037] Furthermore, a rotating knob 20 is fixedly connected to the side of the anti-rotation block 18 away from the fixed block 16, and the side of the anti-rotation block 18 is threadedly connected to the inner side of the mounting ring 10, and the direction of the threaded grooves on the threaded extension rod 19 and the outer side of the anti-rotation block 18 is opposite to the direction in which the threaded grooves of the needle bar fixing member 13 are opened.

[0038] Furthermore, opposite ends of the two needle bar fixing members 13 extend into the needle bar slot 11 and abut against the needle bar 8 .

[0039] Working principle: When using the device to replace the needle bar 8, first rotate the rotating knob 20 so that the outer side of the anti-rotation block 18 and the inner cavity of the anti-rotation block 18 move out of the mounting ring 10 and the threaded extension rod 19 respectively. After the anti-rotation block 18 moves outward, the arc plug block 17 is driven to move out of the arc groove 14 by pulling the fixing block 16. At this time, the tool is inserted into the cross rotating groove 15 and rotated to move the needle bar fixing piece 13 out, releasing the restriction on the needle bar 8. After the needle bar fixing pieces 13 at both ends are moved out, the needle bar 8 can be replaced. After the replacement is completed, the needle bar fixing piece 13 is rotated in until the other side is The ends are butted against the needle bar, and then the arc-shaped plug blocks 17 are inserted into the arc-shaped grooves 14. In this way, after the fixing block 16 is fixed by the anti-rotation block 18, even during the operation of the sewing machine, the vibration of the needle bar 8 will not cause the fixation of the needle bar fixing part 13 to it to become loose. After the anti-rotation block 18 fixes the fixing block 16, the motor can be turned on to work, and the motor drives the pulley 2 to rotate and drives the main shaft 1 to rotate. The rotation of the main shaft 1 drives the needle bar transmission wheel 5 to rotate. The needle bar transmission wheel 5 converts the rotation into the up and down movement of the needle bar 8 through the rotating rod 6 and the connecting rod 9, so that the needle bar 8 drives the crochet hook below to operate.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lockstitch sewing machine driving device, comprising a main shaft (1), a pulley (2), a bearing rod (3), a thread take-up rod (4), a needle bar transmission wheel (5) and a rotating rod (6), one end of the main shaft (1) is fixedly connected to the pulley (2), the pulley (2) is rotatably connected to the motor, the end of the main shaft (1) close to the pulley (2) is rotatably connected to the bearing rod (3), the end of the main shaft (1) close to the bearing rod (3) is movably connected to the thread take-up rod (4), the bearing rod (3) and the thread take-up rod (4) are connected to the thread shuttle and the thread shuttle box below, the other end of the main shaft (1) is fixedly connected to the needle bar transmission wheel (5), the side of the needle bar transmission wheel (5) away from the main shaft (1) is rotatably connected to the rotating rod (6), and the lower end of the rotating rod (6) is movably connected to a connecting rod (9), characterized in that: The end of the connecting rod (9) away from the rotating rod (6) is fixedly connected to the needle rod connecting shaft (7), and further comprises: A needle bar slot (11), located on the needle bar connecting shaft (7), for inserting the needle bar; A fixing device (12), located on both sides of the needle bar connecting shaft (7), for fixing the needle bar; Two mounting rings (10) are located on both sides of the needle bar connecting shaft (7) to prevent the fixing device (12) from loosening; The needle bar slot (11) is movably plugged with a needle bar (8).

2. A lockstitch sewing machine driving device according to claim 1, characterized in that: A needle bar slot (11) is provided on the upper surface of the needle bar connecting shaft (7) and passes through the upper and lower sides. The inner wall of the needle bar slot (11) is fixedly connected with a plurality of protrusions connected in an annular shape and at equal distances, so as to increase the friction between the needle bar (8) and the needle bar.

3. A lockstitch sewing machine driving device according to claim 2, characterized in that: Both sides of the needle bar connecting shaft (7) are fixedly connected with mounting rings (10).

4. A lockstitch sewing machine driving device according to claim 1, characterized in that: The fixing device (12) comprises a needle bar fixing part (13), an arcuate groove (14) and a cross rotation groove (15); thread grooves are provided on the inner ring of the fixing device (12) corresponding to the two sides of the needle bar connecting shaft (7); the needle bar fixing part (13) is threadedly connected in the thread groove; a cross rotation groove (15) is provided on the side of the needle bar fixing part (13) close to the mounting ring (10); and four equally spaced arcuate grooves (14) are provided on the side of the needle bar fixing part (13) close to the cross rotation groove (15).

5. A driving device for a lockstitch sewing machine according to claim 4, characterized in that: The fixing device (12) further comprises a fixing block (16), an arc-shaped plug-in block (17), an anti-rotation block (18) and a threaded extension rod (19); the four arc-shaped grooves (14) are each movably plugged with an arc-shaped plug-in block (17); one end of the four arc-shaped plug-in blocks (17) away from the needle bar fixing member (13) is fixedly connected to the fixing block (16); one end of the fixing block (16) away from the arc-shaped plug-in block (17) is fixedly connected to the threaded extension rod (19); and the anti-rotation block (18) is threadedly connected to the threaded extension rod (19).

6. A driving device for a lockstitch sewing machine according to claim 5, characterized in that: A rotating knob (20) is fixedly connected to the side of the anti-rotation block (18) away from the fixed block (16); the side surface of the anti-rotation block (18) is threadedly connected to the inner side of the mounting ring (10); the direction of the threaded grooves on the outer side of the threaded extension rod (19) and the anti-rotation block (18) is opposite to the direction in which the threaded grooves of the needle bar fixing member (13) are opened.

7. A driving device for a lockstitch sewing machine according to claim 4, characterized in that: The opposite ends of the two needle bar fixing members (13) extend into the needle bar slot (11) and abut against the needle bar (8).

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