Thread trimming mechanism of sewing machine

Abstract

The thread trimming mechanism comprises a rectangular sleeve, a protection box and a main plate, a rectangular vertical rod is arranged in the rectangular sleeve in a penetrating and sleeved mode, an adjusting screw rod is arranged at one end of the top of the rectangular vertical rod in a penetrating and sleeved mode, one end of the adjusting screw rod is rotationally connected with a clamping plate through a bearing, and the protection box is fixed to one side of the rectangular sleeve through a bolt. A large gear is rotationally connected into the protection box through a shaft rod, and a transmission shaft is rotationally connected to the position, located on one side of the large gear, in the protection box through a bearing. The sewing machine stitch moves up and down to drive the double-edge cutting knife to rotate when working, sewing threads can be cut, the situation that the sewing threads are not completely broken is avoided, the double-edge cutting knife with the top and the bottom provided with the cutting edges is adopted, and the sewing threads can be cut when the sewing machine stitch rotates forwards and reversely.

Description

Technical Field

[0001] The utility model relates to the technical field of shoe-making equipment, 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. During the shoe-making process, a sewing machine is used to sew the shoe upper, etc. The thread-cutting mechanism is an important part of the sewing machine and is used to cut the sewing thread.

[0003] The authorized announcement number CN217298243U discloses a thread-cutting mechanism and a sewing machine of a sewing machine, including a machine shell, a motor installed on the machine shell, and a thread-cutting mechanism. The thread-cutting mechanism includes a cutter bar for cutting the thread and a thread-cutting connecting rod that moves up and down. The lower end of the thread-cutting connecting rod is hinged with a scissors connecting rod. An axial bolt is installed in the middle of the scissors connecting rod. The other end of the scissors connecting rod is hinged with a cutter bar connecting rod, and the cutter bar connecting rod is fixedly connected with the cutter bar; the scissors connecting rod is installed on the machine shell through the axial bolt, and the motor is connected with the thread-cutting connecting rod and drives it to move up and down in the machine shell. This thread-cutting mechanism can slide up and down, has a simple structure, is convenient to install, and has a low manufacturing cost. The thread-cutting connecting rod, the scissors connecting rod, and the cutter bar connecting rod adopt the principle of a seesaw to drive the cutter bar to rotate. When the thread-cutting mechanism is working, the noise is small.

[0004] The deficiencies of the existing thread-cutting mechanism and sewing machine of a sewing machine are as follows: it needs to be driven by a thread-cutting connecting rod, a scissors connecting rod, and a cutter bar connecting rod to perform the cutting work, the cutting force is small, and the sewing thread is likely to be incompletely cut when cutting. For this reason, we propose a thread-cutting mechanism of a sewing machine. Summary of the Invention

[0005] The main purpose of the utility model is to provide a thread-cutting mechanism of a sewing machine, which can effectively solve the problems in the background technique.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A thread-cutting mechanism of a sewing machine includes a rectangular sleeve, a protective box, and a main board. A rectangular vertical rod is penetrated and sleeved inside the rectangular sleeve. One end of the top of the rectangular vertical rod is penetrated and sleeved with an adjusting screw rod. One end of the adjusting screw rod is rotatably connected with a clamping plate through a bearing. One side of the rectangular sleeve is fixed with a protective box through a bolt. A large gear is rotatably connected inside the protective box through a shaft rod. A transmission shaft is rotatably connected through a bearing on one side of the large gear inside the protective box. A small gear is fixedly sleeved on the outer side of the transmission shaft. One end of the transmission shaft is fixed with a main board through a bolt. A secondary board is sleeved at one end of the main board. A double-edge cutting knife is fixed at one end of the secondary board.

[0008] Further, a clamping groove is formed on one side of the rectangular vertical rod, one side of the large gear is engaged with the clamping groove, and the side of the large gear away from the clamping groove is engaged with the small gear.

[0009] Further, the main board is located outside the protective box, and one end of the main board is connected with a first fixing bolt through a threaded groove.

[0010] Further, mounting blocks are welded to both ends on one side of the rectangular sleeve, and sealing rings are glued to both ends inside the rectangular sleeve; the arrangement of the mounting blocks facilitates the user to fix the rectangular sleeve with bolts.

[0011] Further, a second fixing bolt is connected to one side of the clamping plate through a threaded groove.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] When the sewing machine stitch moves up and down during operation, it drives the rectangular vertical rod to move up and down. The up and down movement of the rectangular vertical rod drives the main board to rotate through the clamping groove, large gear and small gear. The rotation of the main board drives the sub-board and the double-edged cutting knife at one end thereof to rotate, so as to cut the sewing thread. A double-edged cutting knife with blades provided at both the top and the bottom is adopted, and the sewing thread can be cut when the small gear rotates forward and backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a sewing machine thread cutting mechanism of the utility model.

[0015] Figure 2 It is a schematic diagram of the sectional structure of the protective box of a sewing machine thread cutting mechanism of the utility model.

[0016] Figure 3 It is a schematic diagram of the main board and sub-board structures of a sewing machine thread cutting mechanism of the utility model.

[0017] In the figure: 1, rectangular sleeve; 2, protective box; 3, main board; 4, adjusting screw; 5, clamping plate; 6, clamping groove; 7, large gear; 8, small gear; 9, transmission shaft; 10, sub-board; 11, double-edged cutting knife; 12, first fixing bolt; 13, rectangular vertical rod; 14, mounting block; 15, second fixing bolt; 16, sealing ring. Embodiment

[0018] In order to make the technical means, creative features, achieved purposes and functions of the utility model easy to understand, the utility model will be further described below in conjunction with specific embodiments.

[0019] Such as Figures 1-3As shown, a thread cutting mechanism of a sewing machine includes a rectangular sleeve 1, a protective box 2 and a main board 3. A rectangular vertical rod 13 is inserted through the interior of the rectangular sleeve 1. One end of the top of the rectangular vertical rod 13 is inserted through and sleeved with an adjusting screw rod 4. One end of the adjusting screw rod 4 is rotatably connected with a clamping plate 5 through a bearing. One side of the rectangular sleeve 1 is fixed with a protective box 2 by bolts. Inside the protective box 2, a large gear 7 is rotatably connected through a shaft rod. Inside the protective box 2, on one side of the large gear 7, a transmission shaft 9 is rotatably connected through a bearing. A small gear 8 is fixedly sleeved on the outer side of the transmission shaft 9. One end of the transmission shaft 9 is fixed with a main board 3 by bolts. A sub-board 10 is sleeved on one end of the main board 3. One end of the sub-board 10 is fixed with a double-edge cutting knife 11 by bolts.

[0020] Among them, as Figure 1 and Figure 2 shown, a clamping groove 6 is formed on one side of the rectangular vertical rod 13. One side of the large gear 7 is engaged with the clamping groove 6. The side of the large gear 7 away from the clamping groove 6 is engaged with the small gear 8. When the rectangular vertical rod 13 moves up and down, the large gear 7 is driven to rotate through the clamping groove 6, and the rotation of the large gear 7 drives the small gear 8 to rotate.

[0021] Among them, as Figure 3 shown, the main board 3 is located outside the protective box 2. One end of the main board 3 is connected with a first fixing bolt 12 through a threaded groove. Tightening the first fixing bolt 12 can push and fix the telescoped sub-board 10.

[0022] Among them, as Figure 2 shown, two installation blocks 14 are welded at both ends on one side of the rectangular sleeve 1. Sealing rings 16 are glued at both ends inside the rectangular sleeve 1; the sealing rings 16 seal between the rectangular sleeve 1 and the rectangular vertical rod 13 to prevent dust and the like from entering the rectangular sleeve 1.

[0023] Among them, as Figure 1 shown, one side of the clamping plate 5 is connected with a second fixing bolt 15 through a threaded groove. Tightening the second fixing bolt 15 can fix the clamping plate 5 clamped on the needle foot.

[0024] It should be noted that the present utility model is a thread cutting mechanism for a sewing machine. During operation, a person uses bolts to install the rectangular sleeve 1 on the sewing machine through the mounting block 14, rotates the adjusting screw rod 4 to push the clamping plate 5 to move, adjusts its position, clamps the clamping plate 5 on the sewing needle of the sewing machine, and tightens the second fixing bolt 15 to fix it. When the sewing needle of the sewing machine moves up and down during operation, it drives the rectangular vertical rod 13 to move up and down. The up and down movement of the rectangular vertical rod 13 drives the large gear 7 to rotate through the card slot 6. The rotation of the large gear 7 drives the small gear 8 to rotate. The rotation of the small gear 8 drives the main board 3 to rotate through the transmission shaft 9. The rotation of the main board 3 drives the auxiliary board 10 and the double-edge cutting knife 11 at one end thereof to rotate, so as to cut the sewing thread. The double-edge cutting knife 11 with blades provided at both the top and the bottom can cut the sewing thread when the small gear 8 rotates forward and backward. The auxiliary board 10 is sleeved at one end of the main board 3 and can be telescopic, facilitating the adjustment of the position of the double-edge cutting knife 11.

[0025] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A thread trimming mechanism for a sewing machine, comprising a rectangular sleeve (1), a protective box (2) and a main board (3), characterized in that: A rectangular upright rod (13) is sleeved through the rectangular sleeve (1), an adjusting screw rod (4) is sleeved through one end of the top of the rectangular upright rod (13), one end of the adjusting screw rod (4) is rotatably connected to a clamping plate (5) via a bearing, a protection box (2) is fixed to one side of the rectangular sleeve (1) via bolts, a large gear (7) is rotatably connected to the protection box (2) via a shaft, a transmission shaft (9) is rotatably connected to one side of the large gear (7) via a bearing, a small gear (8) is sleeved outside the transmission shaft (9), a main board (3) is fixed to one end of the transmission shaft (9) via bolts, a sub-board (10) is sleeved on one end of the main board (3), and a double-edged cutting knife (11) is fixed to one end of the sub-board (10) via bolts.

2. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: A slot (6) is provided on one side of the rectangular upright pole (13), one side of the large gear (7) is meshed with the slot (6), and a side of the large gear (7) away from the slot (6) is meshed with a small gear (8).

3. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: The main board (3) is located outside the protection box (2), and one end of the main board (3) is connected to a first fixing bolt (12) via a threaded groove.

4. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: Mounting blocks (14) are welded at both ends of one side of the rectangular sleeve (1), and sealing rings (16) are glued at both ends of the inner side of the rectangular sleeve (1).

5. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: One side of the clamping plate (5) is connected to a second fixing bolt (15) via a threaded groove.

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