Thread trimming mechanism of sewing machine

Abstract

The thread trimming mechanism of the sewing machine relates to the technical field of sewing machines and comprises a tool bit and a box body, a clamping groove is formed in the lower surface of the tool bit, connecting grooves are formed in the surfaces of the left side and the right side of the tool bit respectively, the lower surface of the tool bit is in contact with a fixing base, a cavity is formed in the inner wall of the fixing base, and the box body is arranged in the cavity. A moving groove is formed in the upper side of the inner wall of the cavity, an electric telescopic rod is fixedly connected to the lower side of the inner wall of the cavity, and a hole block is fixedly connected to the output end of the electric telescopic rod. When the cutting edge of the thread trimming mechanism of the sewing machine is blunt, the blunt cutting edge can be taken down and replaced by simply replacing the cutting edge, so that the defect that a plurality of parts on the inner wall of the sewing machine are very inconvenient to install is overcome, the thread trimmer of the thread trimming mechanism of the sewing machine is very convenient to replace, and the service life of the thread trimming mechanism is prolonged. Complicated replacement steps of operators are reduced, a large amount of time is saved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a thread cutting mechanism of a sewing machine. Background Technique

[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 materials are interwoven or sewn together. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and artificial fibers, as well as products such as leather, plastic, and paper. The stitches sewn are neat, beautiful, flat and firm, the sewing speed is fast, and it is easy to use. And it has derived art forms such as hand embroidery and computer embroidery. The design of the household sewing machine enables a person to sew a single item while sewing a single stitch.

[0003] In modern sewing machines, the fabric is easy to smear in and out of the needleless inconvenient sleeve of the machine and use other similar tools for manual sewing, for automatic splicing and time-saving processes. Early sewing machines were either driven by constantly turning a handle or by a pedal mechanism. Later, electric machines were introduced. Compared with household machines, industrial sewing machines are larger, faster, and more diverse in size, cost, appearance, and tasks.

[0004] In the past, the cutting edge of the thread cutting mechanism of the sewing machine was fixedly connected inside the sewing machine chassis. When the cutting edge of the thread cutting mechanism of the sewing machine became dull, the phenomena of incomplete thread cutting and uncut threads would occur, which would affect the working efficiency of the thread cutting mechanism of the sewing machine. Therefore, it was necessary to replace the thread cutting knife of the thread cutting mechanism of the sewing machine. However, there are many parts on the inner wall of the sewing machine, and it is very inconvenient to install them, making it very troublesome to replace the thread cutting knife of the thread cutting mechanism of the sewing machine. Content of the Utility Model

[0005] The purpose of the utility model is to provide a thread cutting mechanism of a sewing machine to solve the problem that in the above-mentioned background technique, the cutting edge of the conventional thread cutting mechanism of the sewing machine is fixedly connected inside the sewing machine chassis. When the cutting edge of the thread cutting mechanism of the sewing machine becomes dull, the phenomena of incomplete thread cutting and uncut threads will occur, which will affect the working efficiency of the thread cutting mechanism of the sewing machine. Therefore, it is necessary to replace the thread cutting knife of the thread cutting mechanism of the sewing machine. However, there are many parts on the inner wall of the sewing machine, and it is very inconvenient to install them, making it very troublesome to replace the thread cutting knife of the thread cutting mechanism of the sewing machine.

[0006] To achieve the above object, the present utility model provides the following technical solution: A sewing machine thread cutting mechanism, comprising a cutter head and a box body. A clamping groove is formed on the lower surface of the cutter head, connection grooves are formed on the surfaces of both left and right sides of the cutter head, the lower surface of the cutter head is in contact with a fixing seat, a cavity is formed on the inner wall of the fixing seat, a moving groove is formed on the upper side of the inner wall of the cavity, an electric telescopic rod is fixedly connected to the lower side of the inner wall of the cavity, an output end of the electric telescopic rod is fixedly connected to a hole block, a clamping block is fixedly connected to the inner wall of the hole block, two arc-shaped rods are slidably connected to the inner wall of the clamping block, and the lower surfaces of the two arc-shaped rods are jointly rotatably connected to one side of the inner wall of the moving groove. A plugging groove is formed on the upper surface of the fixing seat, fixing grooves are formed on the left and right sides of the inner wall of the plugging groove, and fixing devices are arranged in the inner walls of the two fixing grooves.

[0007] Preferably, the fixing device comprises two springs. One ends of the two springs are jointly fixedly connected to one side of the inner wall of the fixing groove. Sliding grooves are formed on the upper and lower sides of the inner wall of the fixing groove. Correspondingly, the inner walls of the sliding grooves are jointly slidably connected to a clamping block through one side surface of a slider. The sliding grooves enable the slider to move more stably, thereby making other structures more stable.

[0008] Preferably, a fixing seat is arranged on the inner wall of the box body. Leg plates are fixedly connected to the left and right sides of the lower surface of the box body, which has the function of supporting other structures.

[0009] Preferably, a placing plate is fixedly connected to the upper surface of the box body.

[0010] Preferably, two inserting rods are fixedly connected to the upper surface of the placing plate. A retaining piece is fixedly connected to the upper surface of the placing plate. The retaining piece protects several sewing needles and reduces thread skipping or needle breakage generated during sewing operations.

[0011] Preferably, a machine housing is fixedly connected to the right side of the upper surface of the placing plate. A turntable is arranged on the right surface of the machine housing.

[0012] Preferably, a connecting rod is fixedly connected to the left side of the upper surface of the machine housing. A sewing needle is arranged on the lower surface of the machine housing.

[0013] The technical effects and advantages of the present utility model:

[0014] 1. By setting the cutter head, card slot, arc-shaped rod, electric telescopic rod, moving slot, bayonet block, hole block, clamping block, spring, fixed slot, sliding slot, fixed seat, cavity, insertion slot, and connection slot, when the cutting edge of the thread cutting mechanism of the new equipment sewing machine becomes blunt, the blunt cutting edge can be simply removed and replaced, eliminating the drawback that it is very inconvenient to install many parts on the inner wall of the sewing machine. This makes it very convenient to replace the thread cutting knife of the sewing machine, simplifies the complex steps for the operator to replace it, saves a lot of time, and improves work efficiency.

[0015] 2. By setting the cutter head, card slot, arc-shaped rod, electric telescopic rod, moving slot, bayonet block, hole block, clamping block, spring, fixed slot, sliding slot, fixed seat, cavity, insertion slot, and connection slot, through the clamping on the side and bottom, the fixation is very firm, preventing the possibility of loosening during the working process.

[0016] 3. By setting the cutter head, card slot, arc-shaped rod, electric telescopic rod, moving slot, bayonet block, hole block, clamping block, spring, fixed slot, sliding slot, fixed seat, cavity, insertion slot, and connection slot, through the clamping on the side and bottom, the cutter head can be conveniently replaced, reducing a large number of replacement steps and improving the practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial sectional structure schematic diagram of the present utility model.

[0018] Figure 2 For the present utility model Figure 1 The enlarged structure schematic diagram of part A.

[0019] Figure 3 For the present utility model Figure 1 The enlarged structure schematic diagram of part B.

[0020] Figure 4 It is a three-dimensional structure schematic diagram of the bayonet block of the present utility model.

[0021] Figure 5 It is a partial three-dimensional structure schematic diagram of the present utility model.

[0022] Figure 6 It is a three-dimensional structure schematic diagram of the whole of the present utility model.

[0023] In the figure: 1. Cutter head; 2. Card slot; 3. Arc-shaped rod; 4. Electric telescopic rod; 5. Moving slot; 6. Bayonet block; 7. Hole block; 8. Clamping block; 9. Spring; 10. Fixed slot; 11. Sliding slot; 12. Fixed seat; 13. Cavity; 14. Insertion slot; 15. Connection slot; 16. Placing plate; 17. Turntable; 18. Machine shell; 19. Needle; 20. Connecting rod; 21. Inserting rod; 22. Flap; 23. Box body; 24. Leg plate. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] The present invention provides a thread cutting mechanism of a sewing machine as shown in Figures 1-6 , which includes a cutter head 1 and a box body 23. A clamping groove 2 is formed on the lower surface of the cutter head 1, connection grooves 15 are formed on the surfaces of both left and right sides of the cutter head 1, a fixed seat 12 is in contact with the lower surface of the cutter head 1, a cavity 13 is formed on the inner wall of the fixed seat 12, a moving groove 5 is formed on the upper side of the inner wall of the cavity 13, an electric telescopic rod 4 is fixedly connected to the lower side of the inner wall of the cavity 13, which is a transmission execution mechanism that realizes telescopic movement in a short distance. The output end of the electric telescopic rod 4 is fixedly connected with a hole block 7, a clamping block 6 is fixedly connected to the inner wall of the hole block 7, two arc-shaped rods 3 are slidably connected to the inner wall of the clamping block 6, the lower surfaces of the two arc-shaped rods 3 are jointly rotatably connected to one side of the inner wall of the moving groove 5, a plug-in groove 14 is formed on the upper surface of the fixed seat 12, fixing grooves 10 are formed on both left and right sides of the inner wall of the plug-in groove 14, fixing devices are formed on the inner walls of the two fixing grooves 10, eliminating the disadvantage that it is very inconvenient to install many parts on the inner wall of the sewing machine, and making it very convenient to replace the thread cutting knife of the thread cutting mechanism of the sewing machine.

[0026] As shown in Figure 2 、 Figure 5 , the fixing device includes two springs 9. A spring is a mechanical part that uses elasticity. Parts made of elastic materials deform under the action of external forces and return to their original state after the external forces are removed. One ends of the two springs 9 are jointly fixedly connected to one side of the inner wall of the fixing groove 10. Sliding grooves 11 are formed on both upper and lower sides of the inner wall of the fixing groove 10. The inner walls of the corresponding sliding grooves 11 are jointly slidably connected through one side surfaces of sliders with clamping blocks 8. Through the clamping on the side and bottom, the fixing is very firm, preventing the possibility of loosening during the working process.

[0027] As shown in Figure 6As shown in the figure, a fixed seat 12 is provided on the inner wall of the box body 23. Leg plates 24 are fixedly connected to both the left and right sides of the lower surface of the box body 23. A placement plate 16 is fixedly connected to the upper surface of the box body 23. Two insertion rods 21 are fixedly connected to the upper surface of the placement plate 16. A baffle 22 is fixedly connected to the upper surface of the placement plate 16. A machine housing 18 is fixedly connected to the right side of the upper surface of the placement plate 16. A turntable 17 is provided on the right surface of the machine housing 18. A connecting rod 20 is fixedly connected to the left side of the upper surface of the machine housing 18. A sewing needle 19 is provided on the lower surface of the machine housing 18. Through the clamping on the side and bottom, the cutter head can be conveniently replaced, reducing a large number of replacement steps and improving the practicability of the device.

[0028] The working principle of the present utility model: When using this new device, first align the cutter head 1 with the insertion slot 14 opened in the fixed seat 12. Push the block 8 connected inside the insertion slot 14 through the lower side of the cutter head 1. Then, through the block 8, compress the spring 9 inside the fixed slot 10. The block 8 is limited by the sliding slot 11 to ensure that the block 8 moves at a specified position. When the connection slots 15 on both sides of the cutter head 1 are flush with the block 8, the block 8 is snapped into the inside of the connection slot 15 through the resilience of the spring 9.

[0029] Then start the electric telescopic rod 4 connected to the upper side of the cavity 13 opened inside the fixed seat 12. Then, the electric telescopic rod 4 pushes the hole block 7 through the moving slot 5 opened above the cavity 13. The hole block 7 drives the bayonet block 6 to move. Then, drive the two arc-shaped rods 3 to rotate through the moving bayonet block 6. The rotating arc-shaped rods 3 are snapped into the inside of the card slot 2. The bottom of the cutter head 1 can be firmly fixed through the arc-shaped rods 3. The lower side of the arc-shaped rod 3 is connected and rotated with the lower side inside the moving slot 5 through a rotating rod, which can prevent the position of the arc-shaped rod 3 from shifting.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A thread trimming mechanism for a sewing machine, comprising a cutter head (1) and a housing (23), characterized in that: The lower surface of the cutter head (1) is provided with a slot (2), the surfaces on both sides of the cutter head (1) are provided with connection slots (15), the lower surface of the cutter head (1) is in contact with a fixed seat (12), the inner wall of the fixed seat (12) is provided with a cavity (13), the upper side of the inner wall of the cavity (13) is provided with a movable slot (5), the lower side of the inner wall of the cavity (13) is fixedly connected to an electric telescopic rod (4), and the output end of the electric telescopic rod (4) is fixedly connected to A hole block (7), the inner wall of the hole block (7) is fixedly connected to a bayonet block (6), the inner wall of the bayonet block (6) is slidably connected to two arc-shaped rods (3), the lower surfaces of the two arc-shaped rods (3) are rotatably connected to one side of the inner wall of the movable groove (5), the upper surface of the fixed seat (12) is provided with a plug-in groove (14), the left and right sides of the inner wall of the plug-in groove (14) are provided with fixed grooves (10), and the inner walls of the two fixed grooves (10) are provided with fixing devices.

2. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: The fixing device comprises two springs (9), one end of the two springs (9) being fixedly connected to one side of the inner wall of the fixing groove (10), and the upper and lower sides of the inner wall of the fixing groove (10) are provided with sliding grooves (11), and the inner walls of the sliding grooves (11) are correspondingly slidably connected to a clamping block (8) through a side surface of a sliding block.

3. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: The inner wall of the box body (23) is provided with a fixing seat (12), and the left and right sides of the lower surface of the box body (23) are fixedly connected with leg plates (24).

4. A thread trimming mechanism for a sewing machine according to claim 3, characterized in that: A placement plate (16) is fixedly connected to the upper surface of the box body (23).

5. A thread trimming mechanism for a sewing machine according to claim 4, characterized in that: Two insertion rods (21) are fixedly connected to the upper surface of the placement plate (16), and a blocking sheet (22) is fixedly connected to the upper surface of the placement plate (16).

6. A thread trimming mechanism for a sewing machine according to claim 5, characterized in that: The right side of the upper surface of the placement plate (16) is fixedly connected to a housing (18), and a rotating disk (17) is provided on the right surface of the housing (18).

7. A thread trimming mechanism for a sewing machine according to claim 6, characterized in that: A connecting rod (20) is fixedly connected to the left side of the upper surface of the casing (18), and a machine needle (19) is provided on the lower surface of the casing (18).

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